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The international regulation for the protection of the environment in the development of marine renewable energy in the EU

Résumé : Marine renewable energy (MRE) technologies have been fostered in the European Union (EU) due to their potential contribution to achieving the EU’s climate objectives and the decarbonization of the energy system. However, their development can pose severe environmental risks to marine ecosystems. Hence, the EU requires environmental protection and sustainable growth for the development of MRE in maritime spaces under the sovereignty or jurisdiction of EU Member States. This article analyses the main international law instruments for the protection of the environment against the impacts associated with the deployment of MRE in the EU. It argues that the international legal framework is theoretically capable of protecting the environment against the impacts of MRE, but that it needs to be further developed and specified to ensure exhaustive protection. However, it also highlights the important role of this framework to provide a basis for developing the framework at the EU secondary law level.
Domaine de référence : EMR
Auteur Soria‐Rodríguez Carlos
Année de parution : 2020.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Platform Stabilization of Floating Offshore Wind Turbines by Artificial Muscle based Active Mooring Line Force Control

Résumé : The floating offshore wind turbine (FOWT) presents under-actuation challenge for controls in terms of platform stability, power regulation and increased structural loads, which demands for simple, low-cost, low-power and high-bandwidth actuation concepts. In this paper, an active mooring line force control (AMLFC) strategy is proposed based on a novel thermally-actuated fishing line artificial muscle (FLAM) actuator. The proposed FLAM actuator consist of multiple bundles of twisted nylon fishing lines, which is added to the junction between the mooring lines and platform bars of FOWT with tensioned-leg platform (TLP). A simulation model of the FLAM actuator is developed in Simulink, along with an interface to the mooring line model of TLP-FOWT in NREL's FAST. The dynamic model of the FLAM actuator is obtained with ANSYS simulation, and a control oriented model is obtained for the FOWT platform motion. A linear quadratic regulator (LQR) is implemented for the FLAM based AMLFC. Simulations are performed on the 5MW WindPACT model for one Region-2 and one Region-3 scenario. Simulation results show that, with mild power consumption, the proposed strategy can significantly reduce the platform roll motion and the tower-base side-side bending loads without little impact on the rotor speed and power output.
Domaine de référence : EMR
Auteur Wu Zhongyou, Li Yaoyu
Année de parution : 2020.
Mots-clés : active mooring line force control, Actuators, artificial muscle, Blades, Floating wind turbine, Heating systems, Load modeling, load reduction, Muscles, platform motion stabilization, Rotors, Wind turbines.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Does wind speed effects performance and cost of energy ? A case study of wind farm

Résumé : Purpose The rapid rising of renewable energy sources particularly wind energy cannot be ignored. The numerical increase in wind energy farms throughout the world is the best example. The purpose of this paper is to assess the basic question of whether wind characteristics affect the performance and cost of energy. The importance of this question cannot be ruled out while comparing renewable energy to a conventional form of energy more specifically especially for the developing country where the cost of energy is very high. Design/methodology/approach The research design of this paper is consists of an assessment of local wind characteristics of the wind farm site using Weibull k and c parameters. The performance model is used to assess the performance of the wind turbine (WT) corresponding to local wind characteristics. The wind correlation with WT in terms of changing wind speed has been assessed to quantify the effects of wind speed on the WT behavior and failure of WT components. Similarly, the power curve of WT is assessed and compared with the International Electrotechnical Commission standards 61400-12-2. The WT power coefficient and tip speed ratio corresponding to wind speed is also investigated. The energy volume and cost of energy lost model is used to determine the cost and volume loss of energy/kWh of the wind farm. Findings The findings of practical wind farms showed that the wind conditions of the site are showing a strong tendency that can be determined from the results of Weibull k and c parameters. The k and c parameters are observed to be 3.44 and 9.16 m/s, respectively, for a period of a year. The standard deviation is observed to be 2.56 for a period of a year. WT shows the efficient behavior can be obtained from the power coefficient and tip speed of WT at different wind speeds. Also, wind farm observation showed that to be some increasing wind speed cause of based WT component failures. The results of energy volume and cost/kWh assessment showed that the major portion of energy volume and cost of energy is lost owing to network, voltage dip and frequency surge, electrical and mechanical components failures. Originality/value Generally, it can be concluded that the WTs are now able to cope with variable wind speeds. However, the results of this paper are showing that WT performance and availability decreased due to increased wind speeds. It can also be a reason to decreased volume and increase the cost of energy/kWh.
Domaine de référence : EMR
Auteur Hulio Zahid Hussain, Jiang Wei
Année de parution : 2020.
Mots-clés : Availability, Cost comparison, Cost of energy, Energy production, Performance, Performance model, Weibull parameters, Wind characteristics.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Coupled modeling and structural vibration control for floating offshore wind turbine

Résumé : The tremendous wind-wave excitations bring about structural vibrations, which would have adverse influences on the power generation efficiency of the spar floating offshore wind turbine (FOWT). Therefore, two tuned mass dampers (TMDs) are installed in the platform and nacelle of the spar FOWT to control the vibration responses of the structure. The aero-hydro-servo-structure-TMDs coupling kinetics model of 16-degree-of-freedom (DOF) is firstly established for the spar FOWT. The correctness of the coupled model is then verified through comparing with OC3 project of FAST developed by the National Renewable Energy Laboratory (NREL). Subsequently, the TMDs stiffness and damping coefficients are optimized in constraints of the TMDs mass and stroke. Furthermore, the vibration reduction effects of TMDs are studied in the free decay state and wind-wave load cases, respectively. The simulation results demonstrate that the platform TMD can effectively reduce the platform pitch (PFPI) movement and low frequency vibration of the tower top fore-aft (TTFA) deflection, while the nacelle TMD is effective for the high frequency vibration of the TTFA deflection. Thus, the TMDs can control the structural vibration responses of spar FOWTs.
Domaine de référence : EMR
Auteur Yang J. J., He E. M.
Année de parution : 2020.
Mots-clés : Coupled model, Dynamic response, FOWT, Lagrange's equations, TMD, Vibration reduction.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

General Criteria for Optimal Site Selection for the Installation of Ocean Thermal Energy Conversion (OTEC) Plants in the Mexican Pacific

Résumé : The purpose of this chapter is to provide an assessment of the resource potential for ocean thermal energy conversion (OTEC) in the Mexican Pacific Ocean (MPO). Research methodology adopted in this study is a combination of geographic information system (GIS), to identify the most promising site in the MPO for OTEC deployment. Site selection criteria rely on conditions such as distance to cold water pumping, bathymetry, thermal difference (not less than 20°C), and social and environmental aspects. Finally we concluded that sites located in the states of Guerrero and Oaxaca have the highest potential of the entire MPO, although there are other areas in the states of Baja California Sur, Nayarit, or Michoacan that might have some interest for OTEC technology.
Domaine de référence : EMR
Auteur Huante Alejandro García, Cueto Yandy Rodríguez, Ruiz Erika Paola Garduño, Contreras Ricardo Efraín Hernández
Année de parution : 2020.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Research and Development Activities of Ocean Thermal Energy-Driven Development in Malaysia

Résumé : The search for potential investors in the conversion of ocean thermal energy to power or hydrogen, and its spinoff projects in Malaysia and the region, continues. In the meantime, several pre-feasibility studies have been completed for selected sites, including that of Pulau Layang-Layang and Pulau Kalumpang (Sabah, Malaysia); Timor-Leste, and off Pulau Weh (Aceh, Indonesia). Various research projects have been completed such as the conversion of solar-thermal to the chilled-water system; the cooling of tropical soils for the culture of temperate crops; the design of offshore structure off the continental slope; hydrogen fuel production and distribution, deep seawater properties to reduce obesity, cholesterol and blood pressure; and the legal-institutional framework for the development of ocean thermal energy conversion. UTM Ocean Thermal Energy Centre (UTM OTEC) has entered into the Collaborative Research Agreement with the Institute of Ocean Energy of Saga University (Japan) to undertake joint research for the development of an experimental rig that introduces a hybrid system with stainless steel heat exchanger. Other aspects of this joint research would include a new design for 3 kW turbine, the introduction of nano-working fluids, the eDNA of intake waters, and improved productivity in the culture of high-value marine produce and products.
Domaine de référence : EMR
Auteur Jaafar A. Bakar, Husain Mohd Khairi Abu, Ariffin Azrin
Année de parution : 2020.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Numerical Study on Initial Laying Process of Submarine Cables for Wave Energy Booster Station in Real Sea States

Résumé : Hu, J.; Li, Z., and Zhang, Y., 2020. Numerical study on initial laying process of submarine cables for wave energy booster station in real sea states. In: Zheng, C.W.; Wang, Q.; Zhan, C., and Yang, S.B. (eds.), Air-Sea Interaction and Coastal Environments of the Maritime and Polar Silk Roads. Journal of Coastal Research, Special Issue No. 99, pp. 60-66. Coconut Creek (Florida), ISSN 0749-0208.Based on real sea conditions of the national wave energy demonstration site in Wanshan sea area of Zhuhai City, China, some numerical experiments are carried out to simulate the submarine cables initial laying process of the Wave Energy Booster Station in this demonstration site. The numerical model is established with the Orcaflex software employed. The motion response of laying ship and the hydrodynamic characteristics of submarine cables are simulated here under three sea conditions, i.e. usual waves, waves with current combined and possible extreme waves. Research results show that the tension and curvature of the cable are large under the condition for wave direction perpendicular to the ship axial direction, which is a relatively bad sea condition. The current also has some influences on the submarine cable laying, and the maximum effective tension of cable produced by the combined wave-current action is 1.35 times that of cable with the wave action alone. When extreme waves appear, pitch, heave and heave acceleration of the laying ship and tension of the cable ends increases obviously. And the variation of effective tension at both cable ends can reach 1.67 times that of cable ends under usual random waves. The numerical model and research results in this paper can provide some guidance for the research and construction of the cable laying of booster stations for marine renewable energy power plants in real sea conditions.
Domaine de référence : EMR
Auteur Hu Jinpeng, Li Zhenglin, Zhang Yunqiu
Année de parution : 2020.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

A Numerical Prediction on the Transient Response of a Spar-type Floating Offshore Wind Turbine in Freak Waves

Résumé : Simulations are conducted in time domain to investigate the dynamic response of a Spar-type floating offshore wind turbine under the freak wave scenarios. Towards this end, a coupled aero-hydro-mooring in-house numerical code is adopted to perform the simulations. The methodology includes a blade-element-momentum model for simulating the aerodynamic loads, a nonlinear model for simulating the hydrodynamic loads, a nonlinear restoring model of Spar buoy and a nonlinear algorithm for simulating the mooring cables. The OC3 Hywind Spar-type FOWT is adopted as an example to study the dynamic response under the freak wave conditions, meanwhile the time series of freak waves are generated using the random frequency components selection phase modulation method. The motion of platform, the tension applied on the mooring lines and the power generation performance are documented in several cases. According to the simulations, it is indicated that when a freak wave acts on the FOWT, the transient motion of the FOWT is induced in all DOFs, as well as the produced power decreases rapidly. Furthermore, the impact of freak wave parameters on the motion of FOWT is discussed.
Domaine de référence : EMR
Auteur Li Yan, Qu Xiaoqi, Liu Liqin, Xie Peng, Yin Tianchang, Tang Yougang
Année de parution : 2020.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Design and aerodynamic performance of new Floating H-Darrieus Vertical Axis Wind Turbines

Résumé : In the last decade, several countries started work on the development of Floating Vertical Axis Wind Turbines, which have significant advantages over Floating Horizontal Axis Wind Turbines. In the present work, we expose a brief history of the use of this type of wind turbines, and we contribute to understanding the existing technologies and we also propose a new design of Floating H-Darrieus Vertical Axis Wind Turbine with three stage rotors. This design solves the problem of starting a large turbine and facilitates maintenance by adopting three mechanisms Bearing Swivel Rollers at each stage. We use the Double Multiple StreamTube method for aerodynamic simulations. The numerical results of the aerodynamic performance analysis show that variable radius rotors maximize the power generated.
Domaine de référence : EMR
Auteur Dabachi Mohamed Amine, Rahmouni Abdellatif, Bouksour Otmane
Année de parution : 2020.
Mots-clés : DMST, F-VAWT, Offshore wind turbine, Three stage rotors, VAWT.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

A review on the technologies, design considerations and numerical models of tidal current turbines

Résumé : Tidal current turbine is one of the innovative and emerging technologies of marine renewable energies because it offers constant and predictable energy source that can be very beneficial, especially for commercial scale production of electrical power. Hydrofoils (HF) are essential elements of tidal current turbine (TCT) and should be properly designed as they play a vital role in improving the turbine output and providing adequate resistance to the blade structure. In connection with the hydrofoil designs, it is noteworthy that the primary objectives in their designs are to increase the coefficient of lift and to reduce the coefficients of drag and pitching moment, thus delaying the cavitation phenomenon. In this paper, the technology developments of the hydrofoil designs used in the horizontal axis TCT industry are reviewed, including the hydrodynamics design and the mechanical structure design. Besides, an up-to-date review and the newest achievements of marine TCT technologies with their developing histories are further explored. Included are also reviews on the numerical models used to assess the performance of TCT and optimization methods applied to design the hydrofoils. This in turn significantly contributes to a better knowledge on the recent designs of TCT hydrofoils for the researchers working in the marine turbine energy domain. Such information could also have important implications in the design of more sophisticated hydrofoils for the exploitation in diverse tidal current energy technologies for reaching a sustainable future.
Domaine de référence : EMR
Auteur Nachtane M., Tarfaoui M., Goda I., Rouway M.
Année de parution : 2020.
Mots-clés : Hydrofoil design, Marine renewable energies, Performance prediction, Tidal current turbine (TCT), Up-to-date review.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Hydrodynamic performance evaluation of a new hydrofoil design for marine current turbines

Résumé : Tidal energy has clear potential in producing large amounts of energy as the world’s capacity exceeds 120 GW. Despite being one of the oldest renewable energy sources exploited by man, the technology is still in its pre-commercialisation stage and so lags behind other renewable sources such as wind and geothermal energy in terms of development and energy produced. One of the emerging energy extraction technologies in the tidal energy field is the Horizontal Axis Hydrokinetic Turbine (HAHT) which harness tidal stream energy the same way Horizontal Axis Wind Turbine (HAWT) extract energy from the wind. While HAHT has been the topic of many researches over the past decade, design of hydrofoils plays a vital role in increasing the structural strength of the blade and maximizing the output of the marine current turbines. In this context, a numerical investigation is conducted in this research in which new hydrofoil for marine current turbines underwater conditions was designed and evaluated. The turbine blade is designed using XFLR5 code and QBlade which is a Blade-Element Momentum solver with a blade design feature. Then, the hydrodynamic performance of hydrofoil was tested using Computational Fluid Dynamics (CFD) consisting of lift and drag coefficients, and velocities distribution. The results showed that the new design of the hydrofoil of marine current turbine blade maintained a CPower value of 50% more from normal range at the TSR 5 to 9 and 51% more at TSR = 6,5 in the performance curve.
Domaine de référence : EMR
Auteur Nachtane M., Tarfaoui M., Saifaoui D., Rouway M.
Année de parution : 2020.
Mots-clés : BE, CFD, Hydrodynamic, Marine current turbin, New hydrofoil.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Real-time relocation of floating offshore wind turbine platforms for wind farm efficiency maximization : An assessment of feasibility and steady-state potential

Résumé : This work examines the steady-state potential and feasibility of Yaw and Induction-based Turbine Repositioning (YITuR), which is a wind farm control concept that passively repositions floating offshore wind turbines using existing turbine control degrees of freedom. To this end, the Floating Offshore Wind Farm Simulator (FOWFSim) is developed to model steady-state wind farm power production while considering floating platform relocation. Optimization studies are carried out with different floating wind farm design parameters and configurations. The objective is to determine sets of optimal wind turbine operating parameters that relocate floating turbines such that wind farm efficiency is maximized. Results show that the potential of YITuR is starkly limited by wind farm design parameters. In particular, anchors should be placed adequately far from floating platform neutral positions, mooring lines should be sufficiently long, and only specific mooring system orientations permit substantial gains in wind farm efficiency. With specific combinations of these parameters, simulation results show that the efficiency of a 7 × 7 floating offshore wind farm may be raised by 42.7% when implementing YITuR in comparison to greedy operation.
Domaine de référence : EMR
Auteur Kheirabadi Ali C., Nagamune Ryozo
Année de parution : 2020.
Mots-clés : Floating offshore wind farm, Floating platform displacement, Mooring lines, Optimization, Wind farm control, Wind farm modeling.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Mapping of Benthic Habitats at Marine Renewable Energy Sites Using Multibeam Echosounder and Sediment Profile Imaging Technologies

Résumé : Abstract Objectives/Scope The goal of this work was to develop a consistent and semi-automated seafloor survey method for generating high-resolution, benthic habitat maps for environmental assessments and monitoring of marine renewable energy sites.
Domaine de référence : EMR
Auteur Revelas Eugene Charles, Sackmann Brandon Steven, Maher Norman Michael, Jones Craig Alexander
Année de parution : 2020.
Type de document : Article de colloque.
Source : Offshore Technology Conference
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Effects of environmental exposure on the mechanical properties of composite tidal current turbine

Résumé : In order to meet the growing demand for energy and also to fight against global warming, Renewable Marine Energies (RME) appeared as a great opportunity for a real ecological and industrial choice. Tidal current turbines are used to extract this energy and installed on the seabed at locations where the nozzle can be prone to the accidental impact and critical loads. The principal objective of this research is to investigate the effects of environmental exposure on the mechanical properties of composite tidal current turbine, the most advanced features currently available in finite element (FE) Abaqus/Explicit have been employed to simulate the behavior of the composite nozzle under static and dynamic loading conditions. To investigate this situation, a parametric analysis is conducted which deals with the effect of velocity and geometry of the impactor. The mechanical behavior has been analyzed as both kinematic effect due to deflection of the composite structure and dynamic effect caused by the interaction between the impactor and the hydrodynamic and hydrostatic pressures over the loading. The stress and the deformation distribution are presented. On the other hand, damage modeling was formulated based on Hashin criteria for intra-laminar damage. This has been accomplished by forming a user-created routine (VUMAT) and executing it in the Abaqus software.
Domaine de référence : EMR
Auteur Nachtane M., Tarfaoui M., Ait Mohammed M., Saifaoui D., El Moumen A.
Année de parution : 2020.
Mots-clés : Composite materials, Damage mechanics, Environmental degradation, Finite element analysis (FEA), Marine turbine, VUMAT.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Fatigue of Slender Offshore Structures : Moorings, Risers, and Umbilicals

Résumé : Abstract Fatigue is one of the key design considerations for moorings, risers, and umbilicals in offshore floating systems. Due to differences in materials, components, configurations, and functionality, these slender structures have distinct driver
Domaine de référence : EMR
Auteur Wu Yongyan, Wang Tao, Vijayaraghavan Vishnu
Année de parution : 2020.
Type de document : Article de colloque.
Source : Offshore Technology Conference
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Design and Stability Analysis of an Offshore Floating Multi-Turbine Platform

Résumé : The technology of multi-turbine platform design is currently in development which can accommodate multiple turbines on a single platform that results in a reduction of installation and mooring costs. This paper presents a method to analyze the effects of the wake between the wind turbines on a multi-turbine platform and use it to find a suitable distance for spacing the wind turbines on the platform. Jensen wake model, Larsen wake model, and CFD simulations are used for calculating the wake effects. The actuator disk theory is used for modeling the rotor. The RANS equations with the 𝒌−𝝎 SST turbulence model are used for CFD calculations. Based on the results of wake effects the spacing requirements for the wind turbines are calculated and the design of the platform is carried out. Hydrostatic analysis of the modeled platform is done to study the floating stability behavior of the platform. The first order hydrodynamics and wave loadings on the platform are calculated in the frequency domain using the potential flow linear diffraction model. The hydrodynamic analysis is carried out on the platform to predict the wave-body interaction between the platform and the waves.
Domaine de référence : EMR
Auteur Bashetty Srikanth, Ozcelik Selahattin
Année de parution : 2020.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Duct and blade design for small-scale floating tidal current turbine development and CFD-based analysis of power performance

Résumé : This paper proposes designs for blades and a water velocity amplification device for the development of a 5-kW duct-type floating tidal current turbine. In addition, it verifies the power performance by a CFD simulation. A BEM theory-based algorithm is used for iterative design and analysis to delay the onset of the chronic problem of cavitation in tidal current turbine blades. The HEEDS optimization software connected to CAE tools is applied to optimize the design of the duct shape, thereby improving the efficiency of the tidal current turbine. The performance of the designed turbine is verified using the CFD software STAR CCM+. A wave model is established to reflect the pressure variation in shallow water when analyzing the cavitation and power performance. The power and efficiency at the rated water velocity are 5 kW and 44 %, respectively. The results indicate that power can be stably controlled due to stalling under the high-flow-velocity condition.
Domaine de référence : EMR
Auteur Im Heejeon, Hwang Taegyu, Kim Bumsuk
Année de parution : 2020.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

PROBABILISTIC ANALYSIS OF THE FATIGUE LIFE OF OFFSHORE WIND TURBINE STRUCTURES

Résumé : The structural response of the main components of offshore wind turbines (OWTs) is considerably sensitive to amplification as their excitation frequencies approach the natural frequency of the structure. Furthermore, uncertainties present in the loading conditions, soil and structural properties highly influence the dynamic response of the OWT. In most cases, the cost of the structure reaches around 30% of the entire OWT because conservative design approaches are employed to ensure its reliability. As a result, this study aims to address the following research question: can the structural reliability of OWT under fatigue loading conditions be predicted more consistently? The specific aims are to (1) establish the design parameters that most impact the fatigue life, (2) determine the probability distributions of the design parameters, and (3) predict the structural reliability. An analytical model to determine the fatigue life of the structure under 15 different loading conditions and two different locations were developed. Global sensitivity analysis was used to establish the more important design parameters. Also, a systematic uncertainty quantification (UQ) scheme was employed to model the uncertainties of model input parameters based on their available information. Finally, the framework used reliability analysis to consistently determine the system probability of failure of the structure based on the fatigue limit state design criterion. The results show high sensitivity for parameters usually considered as deterministic values in design standards. Additionally, it is shown that applying systematic UQ produces a better approximation of the fatigue life under uncertainty and more accurate estimations of the structural reliability. Consequently, more reliable and robust structural designs may be achieved without the need for overestimating the offshore wind turbine response.
Domaine de référence : EMR
Auteur Nispel Abraham, Ekwaro-Osire Stephen, Dias João Paulo
Année de parution : 2020.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Nispel et al. - 2019 - PROBABILISTIC ANALYSIS OF THE FATIGUE LIFE OF OFFS.pdf

Domaine de référence : EMR
Année de parution : 0.
Type de document : Pièce jointe.
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Influence of surface waves on the hydrodynamic performance of a horizontal axis ocean current turbine

Résumé : It is known that surface waves have significant influence on the hydrodynamic performance of ocean current turbines which locate near the water surface. In order to quantitatively analyze the wave influence and reveal the interaction mechanism between the wave and the turbine flow, this paper proposes a three-dimensional transient computational fluid dynamics (CFD) model which can accurately predict the hydrodynamic performance of ocean current turbines under current-wave interaction flow conditions. The influences of two key wave parameters, the wave height and the submerged depth of the turbine, on the hydrodynamic forces and flow structures of a three-bladed horizontal axis ocean current turbine are discussed in depth. It is found that the both the average value and the oscillation amplitude of the torque on the turbine increase with the increased wave height, but decrease with the increase of the submerged depth. It is also found that in the cases of shallow submerged depth, the wake structures of the turbine are affected by the surface wave.
Domaine de référence : EMR
Auteur Tian Wenlong, Ni Xiwen, Mao Zhaoyong, Zhang Tianqi
Année de parution : 2020.
Mots-clés : Computational fluid dynamics (CFD), Hydrodynamics, Ocean current turbine, Tidal turbine, Wave.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

SEM-REV offshore energy site wind-wave bivariate statistics by hindcast

Résumé : Accurate estimation of extreme wind and wave conditions is critical for ocean engineering activities and applications. Various renewable energy offshore structures, particularly floating wind turbines are designed to sustain extreme wind and wave induced loads. Statistics of wind speeds and wave heights is the key input for structural safety and reliability study. Consequently, development of novel robust methods, able to predict extreme wind-wave conditions is essential. This paper discusses criteria for selecting design point by applying recently developed method for estimating extreme wave statistics, based on the hourly wave height and wind speed maxima at the location of interest. Wave and wind data, analyzed in this paper, was obtained from the hindcast model applied to the SEM-REV offshore sea location, near the coast of France, during years 2001–2010. The ECMWF (European Centre for Medium range Weather Forecasting) framework along with the atmospheric model SKIRON were employed to generate accurate hindcast wind-wave hourly data at the location of interest. Note that the SEM-REV site was built within the framework of the CPER (Contrat de Projet Etat-Région) 2007–2013 for the Pays de la Loire region, therefore it is important to note that 2001–2010 data studied in this paper was obtained by hindcast into the time period before SEM-REV began operations. Structural design values are often based on univariate statistical analysis, while actually multivariate statistics is more appropriate for modelling the whole structure. The bivariate analysis of extremes is often poorly understood and generally not adequately considered in most practical measurements/situations, therefore it is important to utilize recently developed bivariate average conditional exceedance rate (ACER2D) method. This paper studies extreme wind speeds and wave heights, that are simultaneously obtained at the same location. Due to less than full correlation between wind speed and wave height, application of the multivariate, or bivariate in the simplest case, extreme value theory is of practical importance. This paper focuses on application of the bivariate ACER2D method for prediction of bivariate extreme value statistics. Finally, this paper suggests how the design point should be chosed based on bivariate analysis. The latter is of particular engineering importance as it presents first application of bivariate wind-wave statistics to a raw SEM-REV site data.
Domaine de référence : EMR
Auteur Gaidai Oleg, Xu Xiaosen, Wang Junlei, Ye Renchuan, Cheng Yong, Karpa Oleh
Année de parution : 2020.
Mots-clés : Bivariate statistics, Extreme value statistics, Offshore wind, SEM-REV energy Site, Wave height statistics.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Generator Topologies for Horizontal Axis Tidal Turbine

Résumé : Over the last decade, research on technologies to exploit tidal current kinetic energy for renewable electricity generation has had a significant growth. However, as to date, there is not a consensus worldwide on standard Power Take-Off (PTO) systems, due to the current immaturity of tidal energy converter technologies. In most cases, mechanical/electrical power conversion follows well-proven technologies derived by the mature wind-energy sector. However, the peculiarities of tidal energy resource impose ad hoc technology solutions. In this paper, different generator topologies and recent developments for marine tidal energy systems are reviewed and compared. The aim is to provide an overall perspective and identify areas for further development. Among considered technologies, the direct-drive permanent magnet synchronous generator by the full-rated frequency converter (FFC) represents an appealing solution, for reduced system complexity and maintenance requirements and possibility to develop smart Maximum Power Point Tracking (MPPT) strategies.
Domaine de référence : EMR
Auteur Rafiei Mohammad, Salvatore Francesco, Giulii Capponi Fabio, Zamboni Walter, Petrone Giovanni
Année de parution : 2020.
Mots-clés : Horizontal axis tidal turbine, Marine current turbine, Ocean energy, Tidal turbine generator.
Type de document : Article de colloque.
Source : Springer International Publishing
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Comparative analysis of numerical computational techniques for determination of the wind turbine aerodynamic performances

Résumé : The purpose of this paper is to explore and define an adequate numerical setting for the computation of aerodynamic performances of wind turbines of various shapes and sizes, which offers the possibility of choosing a suitable approach of minimal complexity for the future research. Here, mechanical power, thrust, power coefficient, thrust coefficient, pressure coefficient, pressure distribution along the blade, relative velocity contoure at different wind speeds and streamlines were considered by two different methods: the blade element momentum (BEM) and computational fluid dynamics (CFD), within which three different turbulence models were analyzed. The estimation of the mentioned aerodynamic performances was carried out on two different wind turbine blades. The obtained solutions were compared with the experimental and nominal (up-scaled) values, available in the literature. Although the flow was considered as steady, a satisfactory correlation between numerical and experimental results was achieved. The comparison between results also showed, the significance of selection, regarding the complexity and geometry of the analyzed wind turbine blade, the most appropriate numerical approach for computation of aerodynamic performances.
Domaine de référence : EMR
Auteur Peric Bojan, Simonovic Aleksandar, Vorkapic Milos
Année de parution : 2020.
Type de document : Article de revue.
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Second-order hydrodynamic effects on the response of three semisubmersible floating offshore wind turbines

Résumé : Floating structures have become the most feasible solution for supporting wind turbines when offshore wind project move to deeper water. In this paper, a hydrodynamic analysis of three different semisubmersible floating offshore wind turbines is carried out including second-order hydrodynamic effects. The three examined platforms are V-shaped semisubmersible, Braceless semisubmersible and OC4-DeepCwind semisubmersible and are used to support the NREL 5 MW reference wind turbine. The main objective of the present study is to investigate and compare the hydrodynamic response of the three different semisubmersible floaters in two water depths (100 m, and 200 m) under different load conditions. The effects of second-order wave loads on the platform motions and mooring tension are discussed and compared by using different methods including Newman's approximation and the full QTF (Quadratic transfer function) method. The drag effect on the structure motion response is also discussed in this paper. The comparison presented is based on statistical values and response spectra of floating platform motions as well as mooring tensions. The results show that the dynamic response of semisubmersible FOWTs (floating offshore wind turbines) is overestimated when ignoring the Morison drag effect on the columns of the semisubmersible FOWT. The second-order difference wave loads can excite the resonance of motion especially for the platform-pitch motion, which could cause structural failures. The full QTF method should be used to calculate the second-order wave force to better simulate the realistic dynamic response of semisubmersible FOWTs.
Domaine de référence : EMR
Auteur Zhang Lixian, Shi Wei, Karimirad Madjid, Michailides Constantine, Jiang Zhiyu
Année de parution : 2020.
Mots-clés : Hydrodynamic loads, Newman's approximation, Quadratic transfer function, Second-order wave loads, Semisubmersible floating wind turbines.
Type de document : Article de revue.
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Characterisation of underwater operational sound of a tidal stream turbine

Résumé : The underwater sound emitted during the operation of the Atlantis AR1500 turbine, a 1.5 MW three bladed horizontal axis tidal-stream turbine, was measured in the Pentland Firth, Scotland. Most sound was concentrated in the lower frequencies, ranging from 50 to 1000 Hz. Within 20 m of the turbine, third-octave band sound pressure levels were elevated by up to 40 dB relative to ambient conditions. In comparison, ambient noise at these frequencies fluctuated by about 5–10 dB between different tidal states. At the maximum recording distance of 2300 m from the turbine, median sound pressure levels when the turbine was operational were still over 5 dB higher than ambient noise levels alone. A higher frequency, tonal signal was observed at 20 000 Hz. This signal component appears at a constant level whenever the turbine is operational and did not change with turbine rotation rate. It is most likely produced by the turbine's generator. This study highlights the importance of empirical measurements of turbine underwater sound. It illustrates the utility and challenges of using drifting hydrophone systems to spatially map operational turbine signal levels with reduced flow noise artefacts when recording in high flow environments.
Domaine de référence : EMR
Auteur Risch Denise, van Geel Nienke, Gillespie Douglas, Wilson Ben
Année de parution : 2020.
Type de document : Article de revue.
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Numerical study of a concept for major repair and replacement of offshore wind turbine blades

Résumé : Repair and replacement of offshore wind turbine blades are necessary for current and future offshore wind turbines. To date, repair activities are often conducted using huge jack-up crane vessels and by applying a reverse installation procedure. Because of the high costs associated with installation and removal of offshore wind turbine components and the low profit margin of the offshore wind industry, alternative methods for installation and removal are needed. This paper introduces a novel concept for replacement or installation of offshore wind turbine blades. The concept involves a medium-sized jack-up crane vessel and a tower climbing mechanism. This mechanism provides a stable platform for clamping, lowering, and lifting of a blade. A case study of a 5-MW offshore wind turbine is shown, where common engineering practices were applied and numerical simulations of the marine operations were carried out using finite element and multibody simulation tools. Operational limits for wave and wind actions were established to demonstrate the technical feasibility of the proposed concept.
Domaine de référence : EMR
Auteur Guachamin‐Acero Wilson, Jiang Zhiyu, Li Lin
Année de parution : 2020.
Mots-clés : blade replacement, numerical simulation, offshore wind turbine, tower climbing mechanism, wind and waves.
Type de document : Article de revue.
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Experimental Electrical Characterisation of Thermoelectric Generator using Forced Convection Water Cooling

Résumé : Thermoelectric Generator (TEG) provides unique advantages as compared to other heat engines as it is capable to convert heat to electricity directly without having any moving parts. Furthermore, TEG is compact, simple and noiseless and requires very minimal maintenance. This paper presents an experimental and analytical study of a model consisting of a TEG located between a copper water cooling jacket and an aluminium block which acts as a heat spreader. The copper water cooling jacket was used in this study as water has higher thermal capacity than air. Besides, copper is one of highest thermal conductivity materials. TEG characterisation in term of electrical was investigated in this study. Based on the result, it shows a linear proportion relationship between open-circuit voltage and temperature difference across TEG. The result also clearly shows the power output of TEG increases as the temperature gradient across TEG increases. In addition, the impact of water flowrate on TEG power output was also studied. Based on the finding, there was an optimum water flowrate of 80 ml/s. Further increasing the water flowrate is not favourable as it will not increase power output and may lead to higher pumping power for water circulation. At this optimum water flowrate, the maximum power output obtained is equal to 530 mW when TEG hot-side temperature (Th) is 180 ℃.
Domaine de référence : EMR
Auteur Bakar Raihan Abu, Singh Baljit, Remeli Muhammad Fairuz, Seng Ong Kok
Année de parution : 2020.
Type de document : Article de revue.
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Dynamic behaviour of an undulating membrane tidal energy converter under wave and current loading

Résumé : The dynamic behaviour of an undulating tidal energy converter under wave and current loadings is studied. Therefore, a small scale prototype of a damped pre-stressed undulating membrane is tested in a wave and current recirculatory tank. The membrane’s dynamic profile and hydrodynamic forces are measured synchronously with the surface elevation for both regular and irregular waves in current direction. Spectrum analysis reveals that the response to wave loading depends on the wave frequency and is reduced by damping-type power take-off. Coupling between the wave frequency and the main undulation frequency or its harmonics is also observed. An increase of 30% of the forces must be foreseen in case of wave condition in the tested range.
Domaine de référence : EMR
Auteur Träsch Martin, Delacroix Sylvain, Déporte Astrid, Drevet Jean-Baptiste, Gaurier Benoît, Germain Grégory
Année de parution : 2020.
Mots-clés : Fluid–structure interaction, Flume tank, Renewable energy, Tidal energy, Undulating membrane, Wave–current interaction.
Type de document : Article de revue.
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Smart Wireless sensors for Impairment detection of the offshore Wind Turbines

Résumé : The maintenance of Wind farms located in the off shores are highly challenging as the preservation and the operational availability are tedious. The insufficiency in the traditional system for monitoring the conditions of the wind turbines located in the off shores has made this topic an attractive area of research. The proposed method in the paper utilizes the multiple intelligent smart sensors to detect the impairments in the structure of the wind turbines. The sensors utilized in the proposed method estimates the damage index in the wind turbine by engaging the embedded software. The effectiveness of the proposed method was measured by applying it to the off shore wind turbines. The results obtained evinces the minimized cost and the down time in maintaining the off shore wind farms.
Domaine de référence : EMR
Auteur Ranganathan Dr G
Année de parution : 2020.
Type de document : Article de revue.
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MONITORING OF OFFSHORE WIND TURBINES UNDER WAVE AND WIND LOADING DURING INSTALLATION

Résumé : During the single blade installation of offshore wind turbines, relative motion between the blade root and turbine hub can cause a delay in the progression of the installation. This contribution presents the results of a monitoring campaign conducted during the installation of an offshore wind park in the North Sea. The campaign covered different states of the turbines: without rotor blades, with rotor blades, without supplementary damping system and with an installed, tuned mass damper system. The objective of the campaign was to determine the dynamic behaviour of the turbines in correlation with wind and wave data and to determine modal parameters. Accordingly, the turbines have been instrumented with sensors to record accelerations at three different positions. The modal parameters were then obtained using SSI/FDD algorithms. Structural damping is additionally determined with an RDM algorithm, and the results are being compared. The analysis of the data will be presented, including the different stages of the structural damping and the corresponding changes in movement patterns. The results shall be used to verify the load models and the predicted response of the structure.
Domaine de référence : EMR
Auteur Sander Aljoscha, Meinhardt Christian, Thoben Klaus-Dieter
Année de parution : 2020.
Type de document : Article de revue.
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Experimental evaluation of a shrouded horizontal axis hydrokinetic turbine with pre-swirl stators

Résumé : Improving the efficiency and power output of hydrokinetic turbines is critical to making them a viable and cost-effective renewable energy solution. Diffusing shrouds have already been shown to improve the performance of horizontal axis, axial-flow turbines. It has been suggested that adding pre-swirl stators to the shroud could alter the inlet flow so as to maximize net tangential force on the turbine blades, thus increasing power output. There is a scarcity of published physical model test data from pre-swirl stator turbines. The present study explores this concept. Four different pre-swirl stator configurations were designed and tested on a shrouded 3-bladed turbine (26.54 cm diameter) in the 36.5 m towing tank at the United States Naval Academy. Three Reynolds numbers (6.07×104, 8.10×104, and 1.01×105 based on stator chord length), corresponding to flow speeds 0.91 m/s, 1.22 m/s, and 1.52 m/s respectively, were tested. At the lowest Reynolds number, all 4 stator configurations improved the maximum Cp by 5–23% compared to the turbine with shroud only. At the middle and highest Reynolds numbers, the stator effect was mostly neutral, with one configuration showing a negative effect at the highest Reynolds number (i.e., lowered the maximum Cp). These results indicate that pre-swirl stators have the potential to improve turbine performance, particularly at lower Reynolds numbers, where the flow is more laminar and the absolute velocities are lower (for a given blade dimension). Pre-swirl stators also appear to reduce the dependence of performance on Reynolds number, flattening the curve and allowing optimal performance over a wider range of operating conditions. Further analytical and computational studies are recommended to explore these findings further, and to develop broader guidance on when pre-swirl stators are advantageous.
Domaine de référence : EMR
Auteur Gish L. A., Carandang A., Hawbaker G.
Année de parution : 2020.
Mots-clés : Hydrokinetic turbine, Marine current turbine, Performance coefficient, Pre-swirl stator, Shroud.
Type de document : Article de revue.
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Monograf 8 РЕД ПЕЧ.pdf

Domaine de référence : EMR
Année de parution : 0.
Type de document : Pièce jointe.
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Estimation of long-term fatigue damage of fixed substructures using fully-coupled models and non-linear dynamic analysis

Résumé : Typical industry models for Offshore Wind Turbines with fixed substructures are based on decoupled models between the wind turbine and the substructure. It is proved that the complete dynamic response of the structure can only be captured with coupled models. In this paper a fully-coupled model for Offshore Wind Turbines with jacket support is presented. The computational model allows to obtain an accurate response of the whole structure and the dynamic interaction between all the elements. It also allows to reproduce particular effects such as the aerodynamic damping without the need for artificial damping ratios which would be needed in decoupled models. Typical environmental offshore conditions are integrated in the model and the response of the structure is obtained by means of a non-linear time integration algorithm in order to include the effect of the continuous rotation of the blades. A cost-efficient approach for the determination of fatigue-damage in the joints of the jackets is proposed. It is based on short-time simulations which allow to accurately estimate the long-term damage in general. The estimation shows a good agreement when compared to the damage values obtained by performing the whole time-interval simulation.
Domaine de référence : EMR
Auteur Couceiro I., París J., Navarrina F., Ramírez L., Colominas I.
Année de parution : 2020.
Mots-clés : Coupled models, Dynamic analysis, Fatigue estimation, Fixed substructures.
Type de document : Article de revue.
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Floating Offshore Wind Turbines : Controlling the impact of vibrations

Domaine de référence : EMR
Auteur Santos Professor Matilde, Tomás-Rodríguez Dr María
Année de parution : 2018.
Type de document : Article de revue.
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A life cycle cost model for floating offshore wind farms

Résumé : Over the last few decades, there has been a renewed interest in the offshore wind sector. In particular, floating wind turbines represent the next frontier in the wind power industry. Currently, only research prototypes exist, and few studies are available on their possible investment cost. Therefore, a cost assessment for this technology is necessary to ascertain whether it is economically sustainable. This paper develops a life cycle cost model for floating offshore wind farms, bringing together the most up-to-date data and parametric equations from databases and literature. The cost model considers the key parameters of the wind power economy, namely CAPEX, OPEX, DECEX and LCOE. The proposed model should be helpful for future decision-making, as the wind energy industry is in constant evolution. An application to an offshore floating wind farms is also carried out, in which the three main types of floaters are considered, namely the Semi-Submersible Platform, the Spar Buoy and the Tension Leg Platform. An average LCOE of 9.74 €c/kWh was found, at the lower bound of the typical range applying to fixed base offshore wind farms, and higher than typical values applying to onshore wind farms.
Domaine de référence : EMR
Auteur Maienza C., Avossa A. M., Ricciardelli F., Coiro D., Troise G., Georgakis C. T.
Année de parution : 2020.
Mots-clés : Economic key parameters, Floating turbines, Life cycle cost assessment, Offshore wind farms, Wind energy.
Type de document : Article de revue.
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A novel optimal energy management strategy for offshore wind/marine current/battery/ultracapacitor hybrid renewable energy system

Résumé : Climate change and high energy demand have significantly increased the need for renewable energy sources (RES). Marine and ocean energy sources draw attention through their high energy potential. Offshore wind and marine current energy is an attractive RES with great potential. The wind and current energy in the marine produces an intermittent and unstable power by nature. Energy storage systems are the most effective solution to minimize power fluctuations in the system and to ensure stable energy demand. This paper presents a novel optimal energy management strategy (NOEMS) for optimal power flow control of the offshore wind/marine current/battery/ultracapacitor hybrid power generation system and for the most efficient harvesting of hybrid renewable energy system (HRES). The proposed NOEMS algorithm calculates as real time the amount of power generated by the HRES and demanded by the load. In this study, nine different dynamic operation modes were considered. Experimental results have shown that the battery and ultracapacitor support to the HRES. In this study, the dynamic behavior of the NOEMS algorithm was investigated by performing a sudden load test from 18 W to 30 W. The NOEMS algorithm shows that the system can minimize power loss, voltage fluctuation, control the charge/discharge status of the battery and ultracapacitor. The proposed algorithm continuously shifts the required power over the hybrid energy storage system to provide the load demand continuously.
Domaine de référence : EMR
Auteur Aktaş Ahmet, Kırçiçek Yağmur
Année de parution : 2020.
Mots-clés : Battery, Hybrid energy storage, Marine current, Offshore wind, Optimal energy management, Ultracapacitor.
Type de document : Article de revue.
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Advancements of wave energy converters based on power take off (PTO) systems : A review

Résumé : Ocean waves contain one of the world's largest untapped and predictable renewable energy sources that can be used to fulfil the energy demand in the present energy crises situation. There are many devices that have been proposed and prototyped in different countries all around the world to harness wave energy based on different power take-off (PTO) systems. The aim of this article is to review the power take-off (PTO) systems of the wave energy converters (WEC). The review starts with a brief introduction and background of wave energy. Following this, a novel classification of WEC systems is introduced. Then, the WECs based on the different working methods of their power take off systems are briefly reviewed. This includes an analysis and comparison of advantages and challenges of the power take off systems. Aspects of current international research and development activities and networks for wave energy is also discussed. The current market of wave energy technologies is also assessed, showing that the mechanical direct drive system is the most popular. Hybrid PTO systems are seen as an important development for the future.
Domaine de référence : EMR
Auteur Ahamed Raju, McKee Kristoffer, Howard Ian
Année de parution : 2020.
Mots-clés : Ocean waves, Performance, Power take off system, Wave energy converter, Working methods.
Type de document : Article de revue.
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A Review on Wave Energy Harvester

Résumé : Generating electricity from wave power has to overcome the electricity need in coastal areas. The consumption rate of conventional energy resources is much higher than the replenishing rate. The depletion of fossil fuels has created a great desire in searching for alternative energy sources. Harvesting of alternative energy is a quite difficult and challenging task, most importantly for harvesting wave energy. This review explained Wave Energy Converter (WEC) and the different methods used in the Wave Energy Harvesting process. Buoyancy force and wave power calculation are identified. This method of energy harvesting can rectify the energy shortage in coastal areas. Our intention is to give an Eco-friendly and low-cost method to harvest energy from nature.
Domaine de référence : EMR
Auteur Vimal A, Kumar P Ravi, Saji S, Sathish D, Thangamani J R Sudalai
Année de parution : 2020.
Type de document : Article de revue.
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Extended environmental contour methods for long-term extreme response analysis of offshore wind turbines

Résumé : Environmental contour method is an efficient method for predicting the long-term extreme response of offshore structures. The traditional environmental contour is obtained using the joint distribution of mean wind speed, significant wave height and spectral peak period. To improve the accuracy of traditional environmental contour method, a modified method was proposed considering the non-monotonic aerodynamic behavior of offshore wind turbines. Still, the modified method assumes constant wind turbulence intensity. In this paper, we extend the existing environmental contour methods by considering the wind turbulence intensity as a stochastic variable. The 50-year extreme responses of a monopile-based offshore wind turbine are compared using the extended environmental contour methods and the full long-term method. It is found that both the environmental contour method and the modified environmental contour method, with the wind turbulence intensity included as an individual variable, give more accurate predictions compared with those without. Using the full long-term method as a benchmark, this extended approach could reduce the nonconservatism of the environmental contour method and conservatism of the modified environmental contour method. This approach is effective under wind-dominated or combined wind-wave loading conditions, but may not be as important for wave-dominated conditions.
Domaine de référence : EMR
Auteur Chen Xiaolu, Jiang Zhiyu, Li Qinyuan, Li Ye, Ren Nianxin
Année de parution : 2020.
Type de document : Article de revue.
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Structural health monitoring of an offshore wind turbine tower using iFEM methodology

Résumé : With the increasing popularity of wind energy, offshore wind turbines (OWTs) are currently experiencing rapid development. The tower is one of the most significant components of the OWT. However, the tower will not only stand its own weight and weight of the top structure, but also be surrounded by harsh wave and wind loading conditions. Therefore, it is necessary to apply a structural health monitoring (SHM) system to monitor the health condition of the OWT towers in real-time. In this study, inverse Finite Element Method (iFEM) is applied to monitor the tower of an OWT under both static and dynamic loading conditions. The total displacements and von Mises stresses obtained from iFEM analysis are compared against reference results and optimum sensor locations are determined.
Domaine de référence : EMR
Auteur Li Mingyang, Kefal Adnan, Oterkus Erkan, Oterkus Selda
Année de parution : 2020.
Type de document : Article de revue.
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• Biocorrosion icone-flux-rss

Marine bacterial community analysis on 316L stainless steel coupons by Illumina MiSeq sequencing

Résumé : In order to evaluate the corrosive action of microorganisms on 316L metal exposed directly to a marine environment, a system was designed to immerse coupons in seawater. After periods of 30, 60 and 90 days, the coupons were recovered, the corrosion rates evaluated and the biofilm samples on their surface were analyzed by 16S rRNA gene sequencing. The results of the corrosion rate showed an acceleration over the entire experimental period. Alpha diversity measurements showed higher rates after 60 days of the experiment, while abundance measurements showed higher rates after 90 days of exposure to the marine environment. The beta-diversity results showed a clear separation between the three conditions and proximity in the indices between replicates of the same experimental condition. The results of 16S rRNA gene sequencing showed that after 30 days of exposure to seawater, there was massive representativeness of the pioneer bacteria, Gamma and Alphaproteobacteria, with emphasis on the genera Alcanivorax, Oceanospirillum and Shewanella. At the 60-day analysis, the Gammaproteobacteria class remained dominant, followed by Alphaproteobacteria and Flavobacteria, and the main representatives were Flexibacter and Pseudoalteromonas. In the last analysis, after 90 days, a change in the described bacterial community profile was observed. The Gammaproteobacteria class was still the largest in diversity and OTUs. The most predominant genera in number of OTUs were Alteromonas, Bacteriovorax and, Nautella. Our results describe a change in the microbial community over coupons directly exposed to the marine environment, suggesting a redirection to the formation of a mature biofilm. The conditions created by the biofilm structure suggest said condition favor biocorrosion on the analyzed coupons.
Domaine de référence : Biocorrosion
Auteur Capão Artur, Moreira-Filho Paulo, Garcia Maurício, Bitati Suleima, Procópio Luciano
Année de parution : 2020.
Type de document : Article de revue.
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Microbiologically influenced corrosion of carbon steel pipeline in shale gas field produced water containing CO2 and polyacrylamide inhibitor

Résumé : Microbiologically influenced corrosion (MIC) and CO2 corrosion are the common types of corrosion in shale gas fields. In this study, the effect of quaternized polyacrylamide inhibitor on MIC was studied in the produced water from a shale gas field using a circulating loop system with CO2. The result shows that polyacrylamide can inhibit CO2 corrosion. However, in the presence of microorganisms, polyacrylamide failed to inhibit MIC. Microorganisms formed biofilm on the coupon surface. Pitting nucleated underneath the biofilm and developed into cavity-type due to the local acidification. According to crystal structure and chemical composition of matters in the biofilm, the mechanism of microbial acidification leading to pitting corrosion was proposed. The prevention and control strategy for MIC in CO2 environment was discussed.
Domaine de référence : Biocorrosion
Auteur Feng Siqiao, Li Yingchao, Liu Huamin, Liu Qiaoping, Chen Xu, Yu Haobo, Chen Changfeng
Année de parution : 2020.
Mots-clés : Cavity-type pitting, Corrosion inhibitor, Local acidification, MIC, Quaternized polyacrylamide.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Changes in microbial community in the presence of oil and chemical dispersant and their effects on the corrosion of API 5L steel coupons in a marine-simulated microcosm

Résumé : The influence of crude oil and chemical dispersant was evaluated over planktonic bacteria and biofilms grown on API 5L steel surfaces in microcosm systems. Three conditions were simulated, an untreated marine environment and a marine environment with the presence of crude oil and a containing crude oil and chemical dispersant. The results of coupon corrosion rates indicated that in the oil microcosm, there was a high corrosion rate when compared with the other two systems. Analysis of bacterial communities by 16S rRNA gene sequencing described a clear difference between the different treatments. In plankton communities, the Bacilli and Gammaproteobacteria classes were the most present in numbers of operational taxonomic unit (OTUs). The Vibrionales, Oceanospirillales, and Alteromonadales orders were predominant in the treatment with crude oil, whereas in the microcosm containing oil and chemical dispersant, mainly members of Bacillales order were detected. In the communities analyzed from biofilms attached to the coupons, the most preponderant class was Alphaproteobacteria, followed by Gammaproteobacteria. In the control microcosm, there was a prevalence of the orders Rhodobacterales, Aeromonadales, and Alteromonadales, whereas in the dispersed oil and oil systems, the members of the order Rhodobacterales were present in a larger number of OTUs. These results demonstrate how the presence of a chemical dispersant and oil influence the corrosion rate and bacterial community structures present in the water column and biofilms grown on API 5L steel surfaces in a marine environment.
Domaine de référence : Biocorrosion
Auteur Procópio Luciano
Année de parution : 2020.
Type de document : Article de revue.
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Compositions and Methods for Remediation of Sulfate Reducing Prokaryotes

Résumé : Compositions and methods are provided for use in controlling souring and corrosion causing prokaryotes, such as SRP, by treating oil and gas field environments or treatment fluids with a newly identified bacterial strain ATCC Accession No. PTA-124262 as a self-propagating whole cell that produces an anti-SRP bacteriocin in situ. In another aspect, the methods use one or more toxic peptides or proteins isolated therefrom in methods to control unwanted prokaryotic growth in these environments.
Domaine de référence : Biocorrosion
Auteur Manna Kathleen, Tomlinson Ian a, Thatipelli Abhiram, Janes Christopher, Summer Elizabeth J.
Année de parution : 2020.
Type de document : Brevet.
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Methods for Diagnosing, Monitoring and Mitigating Microbiologically Influenced Corrosion

Résumé : Provided are methods for diagnosing, monitoring and mitigating microbiologically influenced corrosion (MIC). The methods employ steps to determine the nature and concentration of biological signatures, formed through metabolism of microorganisms, and correlating the biological signatures with MIC. Based on such analyses, appropriate MIC mitigation strategies may be implemented so as to efficiently target MIC at sites of interest. The methods advantageously allow selection of appropriate MIC mitigation treatments that correspond to the level of severity of the MIC and based on historical data correlating particular biological signatures with particular MIC risk.
Domaine de référence : Biocorrosion
Auteur Zhang Xiaozhou, Enning Dennis R., Higgins Meytal B., Mand Jaspreet, Cao Fang, Pilloni Giovanni, Chatterjee Mohor
Année de parution : 2020.
Type de document : Brevet.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Microbiologically influenced corrosion of carbon steel pipeline in shale gas field produced water containing CO2 and polyacrylamide inhibitor

Résumé : Microbiologically influenced corrosion (MIC) and CO2 corrosion are the common types of corrosion in shale gas fields. In this study, the effect of quaternized polyacrylamide inhibitor on MIC was studied in the produced water from a shale gas field using a circulating loop system with CO2. The result shows that polyacrylamide can inhibit CO2 corrosion. However, in the presence of microorganisms, polyacrylamide failed to inhibit MIC. Microorganisms formed biofilm on the coupon surface. Pitting nucleated underneath the biofilm and developed into cavity-type due to the local acidification. According to crystal structure and chemical composition of matters in the biofilm, the mechanism of microbial acidification leading to pitting corrosion was proposed. The prevention and control strategy for MIC in CO2 environment was discussed.
Domaine de référence : Biocorrosion
Auteur Feng Siqiao, Li Yingchao, Liu Huamin, Liu Qiaoping, Chen Xu, Yu Haobo, Chen Changfeng
Année de parution : 2020.
Mots-clés : Cavity-type pitting, Corrosion inhibitor, Local acidification, MIC, Quaternized polyacrylamide.
Type de document : Article de revue.
Exporter la référence : BibTeX | Zotero RDF | RIS (EndNote)

Addressing the slow corrosion rate of biodegradable Fe-Mn : Current approaches and future trends

Résumé : The movement towards the commercialization of biodegradable Fe has been hampered by the perceived slow degradation rate of the metal in physiological environments. The introduction of Fe-Mn alloys offers promise due to its significantly improved biocorrosion rates, excellent biocompatibility, and non-magnetic properties. However, the issue of slow corrosion rates persists in this alloy and its future hinges on addressing this issue. This short review report presents the current approaches to address this problem, the challenges concerning Fe-Mn corrosion, and some future techniques that may improve the degradation rate of Fe-Mn alloys.
Domaine de référence : Biocorrosion
Auteur Venezuela J., Dargusch M. S.
Année de parution : 2020.
Mots-clés : Biocorrosion, Biodegradable metals, Corrosion, Iron-manganese.
Type de document : Article de revue.
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Stress-assisted microbiologically influenced corrosion mechanism of 2205 duplex stainless steel caused by sulfate-reducing bacteria

Résumé : In the present work, we studied the stress-assisted microbiologically influenced corrosion mechanism of 2205 duplex steel caused by sulfate-reducing bacteria (SRB) in simulated seawater environment. The results suggested that SRB have a significant influence on the pitting behavior of 2205 DSS, and stress promotes the MIC behavior. The mechanism proposes that the ferrite phases and high-residual stress regions manifest as the preferential anodic electron donor for SRB respiration due to the galvanic effect caused by the composing duplex phases, high-stress regions and low-stress regions; this outcome leads to the preferential dissolution of ferrite phases and high-stress regions.
Domaine de référence : Biocorrosion
Auteur Yang Xiaojia, Shao Jiamin, Liu Zhiyong, Zhang Dawei, Cui Liying, Du Cuiwei, Li Xiaogang
Année de parution : 2020.
Mots-clés : 2205 DSS, microbiologically influenced corrosion, quasi-in-situ EBSD, SKPFM, sulfate-reducing bacteria.
Type de document : Article de revue.
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Corrosion of X52 pipeline steel in a simulated soil solution with coexistence of Desulfovibrio desulfuricans and Pseudomonas aeruginosa bacteria

Résumé : In this work, corrosion of an X52 pipeline steel was investigated in a simulated soil solution containing Pseudomonas aeruginosa (PAO1), Desulfovibrio desulfuricans (sulfate-reducing bacteria, SRB) or both, where the corrosion rates of the steel are 0.035, 0.076 and 0.060 mm/y, respectively. There is no corrosion enhancement between PAO1 and SRB when they coexist. The presence of PAO1 facilitates the SRB cells to be surrounded by corrosion products, and cannot contribute to corrosion at the identical level to the SRB that are bare to the environment. The three microorganism scenarios cause localized corrosion on the steel.
Domaine de référence : Biocorrosion
Auteur Liu Hongwei, Cheng Y. Frank
Année de parution : 2020.
Mots-clés : A. steel, B. EIS, B. polarization, B. SEM, B. weight loss, C. microbiological corrosion.
Type de document : Article de revue.
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Study on Microbiologically Influenced Corrosion Resistance of Stainless Steels With Weld Seams

Résumé : Stainless steels are widely used in various industries due to their desirable combination of mechanical properties and corrosion resistance. However, corrosion of stainless steels was reported seriously on the weld seam areas, and it is not exceptive for microbiologically influenced corrosion (MIC). In the present study, MIC resistance of two austenitic stainless steels (A1, A2 for short) and a duplex stainless steel (D1 for short) with weld seams were comparatively studied by measurement of average and maximum pit depths and electrochemical tests. Experimental results showed that the pit depth on the weld seam was much deeper than that on the base metal for all the stainless steels. The variations of linear polarization resistance (RLPR) values on base metal and weld seam showed that weld seam could promote MIC. Thus the study indicated that the weld seam accelerated the MIC. In addition, A1 steel with higher Cu content showed the best MIC resistance, followed by A2 steel with lower Cu content, and D1 steel without Cu addition exhibited the worst resistance to MIC, indicating that Cu addition in stainless steels is speculated to be beneficial to the MIC resistance. The mechanisms of Cu improving the MIC resistance in the stainless steels were discussed.
Domaine de référence : Biocorrosion
Auteur Shi Xianbo, Yang Ke, Yan Maocheng, Yan Wei, Shan Yiyin
Année de parution : 2020.
Mots-clés : Austenitic stainless steel, base metal, Duplex stainless steel, Microbiologically influenced corrosion, Pitting corrosion, Weld seam.
Type de document : Article de revue.
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Influence of Environmental Parameters on Microbiologically Influenced Corrosion Subject to Different Bacteria Strains

Résumé : Microbiologically influenced corrosion (MIC) is capable on weakening the metal’s strength, eventually leads to pipeline leakage, environmental hazard and financial loss. Sulfate reducing bacteria (SRB) is the principal causative organism responsible for external corrosion on steel structures. To date, considerable works have been conducted in Malaysia on the mechanisms of SRB upon MIC on the marine environment instead of underground. Moreover, commercial bacteria strain represents local strain in terms of performance and behavior upon corrosion of steel structure is yet to be proven. Thus, this paper aims to investigate the influence of environmental parameters towards MIC in corroding pipeline. Two types of SRB strain were used designated as SRB ATCC 7757 (commercial) and SRB Sg. Ular (local strain) isolated from Malaysian soil. The behavior of both strains was critically compared by calculating the rate of corrosion upon carbon steel coupons in stipulated environmental parameters. Four influential parameters i.e. pH, temperature, salinity concentration and iron concentration were considered. Collected data presented and analyzed using graphical and statistical analysis, respectively. The results showed the difference of corrosivity between two SRB strains in terms of corrosion behavior upon the X-70 steel coupon. SRB Sg. Ular able to cause severe effects upon steel structure as compared to SRB ATCC 7757 due to its aggressiveness shown by the recorded metal loss data. Thus, future works related to MIC for local environment in particular, should not compromise with the type of SRB strains considered due to differences of performance of the microorganisms onto tested environment and materials.
Domaine de référence : Biocorrosion
Auteur Mohd Ali Muhammad Khairool Fahmy, Ismail Mardhiah, Abu Bakar Akrima, Md. Noor Norhazilan, Yahaya Nordin, Zardasti Libriati, Md. Sam Abdul Rahman
Année de parution : 2020.
Type de document : Article de revue.
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Microbiologically influenced corrosion of X80 pipeline steel by nitrate reducing bacteria in artificial Beijing soil

Résumé : In this work, we investigated microbiologically influenced corrosion (MIC) of X80 pipeline steel caused by nitrate-reducing bacteria Brevibacterium frigoritolerans (B. frigoritolerans) in an artificial Beijing soil using electrochemical measurements and surface analyses under aerobic conditions. The B. frigoritolerans was isolated from the surrounding soil of the X80 pipeline steel specimen in Beijing using culturing and molecular biology techniques. Confocal laser scanning microscopy images showed that the largest pit depth after 14 days due to B. frigoritolerans was approximately 7.16 μm. Electrochemical tests showed that the B. frigoritolerans could change the stability of the corrosion products on the 7th day. Inhomogeneous biofilm and the conductivity of Fe2O3 accelerated the corrosion process. The presence of NH4+ on the surface of the X80 pipeline steel revealed that the B. frigoritolerans acted as a biological cathode to promote the cathodic reaction.
Domaine de référence : Biocorrosion
Auteur Liu Bo, Li Ziyu, Yang Xiaojia, Du Cuiwei, Li Xiaogang
Année de parution : 2020.
Mots-clés : biocatalytic cathodic nitrate reduction, inhomogeneous biofilm, microbiologically influenced corrosion, nitrate-reducing bacteria, X80 pipeline steel.
Type de document : Article de revue.
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SURFACE_COATINGS.pdf

Domaine de référence : Biocorrosion
Année de parution : 0.
Type de document : Pièce jointe.
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Effect of Applied Potential and Sulfate Reducing Bacteria on Corrosion Behavior of X80 Steel in Dagang Soil Simulated Solution

Résumé : The corrosion behavior of X80 steel in Dagang soil simulated solution was verified by potentiostatic immersion test and AC impedance test, and the corrosion morphology of metal surface under different applied potential in bacterial solution and sterile solution was observed by scanning electron microscope (SEM).The results showed that the existence of sulfate reducing bacteria (SRB) can increase the corrosion trend of metals. In the simulated solution, the corrosion of samples became more and more serious with the increase of soaking days. With the negative shift of applied potential, the electrochemical corrosion rate of X80 pipeline steel was lower than that under self-corrosion potential.
Domaine de référence : Biocorrosion
Auteur Key Laboratory of Oil & Gas Storage and Transportation, College of Petroleum Engineering, Liaoning Shihua University, Fushun Liaoning, 113001, China., Sun Xiaoqing
Année de parution : 2020.
Type de document : Article de revue.
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Method And System For Moving Substances And Preventing Corrosion In A Conduit

Résumé : A conduit or pipeline system configured to use a liquid containing fluid, such as water, which typically accumulates in low flow pipelines causing corrosion and accumulation of sediments, to remove sediments and prevent corrosion. The liquid-containing fluid can be introduced into gas lines to remove solids, for example, black powder.
Domaine de référence : Biocorrosion
Auteur Beliaeva Ellina, Barr Michael E.
Année de parution : 2020.
Type de document : Brevet.
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Complete Genome Sequence of Pseudomonas balearica Strain EC28, an Iron-Oxidizing Bacterium Isolated from Corroded Steel

Résumé : Pseudomonas balearica strain EC28 is an iron-oxidizing bacterium isolated from corroded steel at a floating production storage and offloading facility in Australia. Here, we report its complete genome sequence, which comprises 4,642,566 bp with a GC content of 64.43%. The genome harbors 4,164 predicted protein-encoding genes.
Domaine de référence : Biocorrosion
Auteur Salgar-Chaparro Silvia J., Castillo-Villamizar Genis, Poehlein Anja, Daniel Rolf, Machuca Laura L.
Année de parution : 2020.
Type de document : Article de revue.
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Compositions and Methods for Reducing Hydrogen Sulfide and Microbial Influenced Corrosion in Crude Oil, Natural Gas, and in Associated Equipment

Résumé : The present invention provides compositions and methods for reducing hydrogen sulfide and/or mercaptans in oil and/or natural gas as well as for reducing microbial induced corrosion (“MIC”) in oil and gas production environments. In particular, the subject invention provides environmentally-friendly compositions and methods for reducing hydrogen sulfide in oil and natural gas environments by controlling biocorrosive bacteria, such as SRB, therein.
Domaine de référence : Biocorrosion
Auteur Farmer Sean, Alibek Ken, Karathur Karthik N., Nerris Anthony, Shumway Martin R., Callow Nicholas, Mcgonagle Ryan, Kreager Don, Chen Yajie, Seidleck James J., Saliwanchik Lloyd & Eisenschenk
Année de parution : 2020.
Type de document : Brevet.
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Comparison of microbial influenced corrosion in presence of iron oxidizing bacteria (strains DASEWM1 and DASEWM2)

Résumé : Microbial influenced corrosion (MIC) is one of the major concerns in industries due to huge economic losses. Sulfate-reducing bacteria (SRB) are well studied and highly corrosive in nature. However, the MIC mechanism, especially by iron-oxidizing bacteria (IOB) is not yet elucidated. In this context, this study presented the co-relation of extra polymeric substances (EPS) exuded by IOB strains as a key mechanism for MIC of mild steel. Herein, the corrosion behavior of mild steel influenced by EPS of two IOB strains; DASEWM1 and DASEWM2 isolated from river water was investigated. Comparative studies using surface analysis, electrochemical tests and immersion tests in nutrient broth media revealed a higher degree of corrosion in inoculated media (strain DASEWM1 < DASEWM2) than control media. These results were also supported by EIS and FESEM of corroded steel surfaces. Moreover, electrochemical and EPS constituent’s analysis, the correlation between the corrosion rate to the EPS constituents were also studied.
Domaine de référence : Biocorrosion
Auteur Sachan Reena, Singh Ajay Kumar
Année de parution : 2020.
Mots-clés : Biofilm, Corrosion tests, FTIR, Iron oxidizing bacteria, Mild steel, XRD.
Type de document : Article de revue.
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Microbiological Corrosion of Buildings : A Guide to Detection, Health Hazards, and Mitigation

Résumé : Environmental stress caused by water continuously exposes buildings to microbial colonization. This is highly evident when both minor dampness and mass flooding
Domaine de référence : Biocorrosion
Auteur Górny Rafal
Année de parution : 2020.
Type de document : Livre.
Source : CRC Press
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Investigating the microbial-influenced corrosion of UNS S32750 stainless-steel base alloy and weld seams by biofilm-forming marine bacterium Macrococcus equipercicus

Résumé : This study investigates the microbial-influenced corrosion of UNS S32750 super-duplex stainless-steel joints fabricated using different welding methods. Herein, the samples were introduced into a medium inoculated with Macrococcus equipercicus isolated from a marine environment. Confocal laser scanning microscopy and atomic force microscopy were used to characterise the topography and formation of pits in the corroded samples, respectively. Potentiodynamic polarisation studies were conducted on both the base alloy and weld seams exposed for 30 and 60 days in the experimental system inoculated with M. equipercicus and un-inoculated system. Results indicate that the thickness of the biofilm formed due to this bacterium increased and became heterogeneous with an increase in the exposure time, thereby resulting in micro-pits. Bacterial colonisation was observed in all the coupons after exposure to the inoculated medium. Although micro-pits were observed in all the coupons, the base metal and flux-cored arc weld seams showed highest sensitivity to bacterial attack.
Domaine de référence : Biocorrosion
Auteur Arun D., Vimala R., Devendranath Ramkumar K.
Année de parution : 2020.
Mots-clés : atomic force microscopy, biofilm, confocal laser scanning microscopy, Microbial-influenced corrosion, super-duplex stainless-steel.
Type de document : Article de revue.
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Cathodic Polarization Behavior of Steel with Different Marine Fouling Morphologies on Submerged Bridge Elements with Cathodic Protection

Résumé : Severe localized corrosion of submerged steel bridge piles in Florida was associated with fouling and microbial-influenced-corrosion (MIC). The research in this study evaluated the efficacy of cathodic protection (CP) in those environments. Field tests were conducted in two natural rivers with different marine fouling morphologies. The test steel arrays were coupled to a zinc-sacrificial anode, and system potentials of approximately −923  mV with respect to the saturated-calomel electrode (SCE) developed. Global CP currents to the steel exceeded 3  μA/cm2 and generally reduced the overall corrosion rate. The CP current was related to cathode surface availability under fouling, and portions of the array did not receive sufficient cathodic polarization. Laboratory tests were conducted using specimens with different surface crevice morphologies that were cathodically polarized at −850 and −950  mVSCE and immersed in solutions inoculated with sulfate-reducing bacteria. Tests confirmed that the presence of crevices reduce CP effectiveness. Fouling environments caused insufficient levels of CP and supported the growth of bacteria associated with MIC. CP alone may not be adequate to mitigate crevice corrosion and MIC under heavy fouling.
Domaine de référence : Biocorrosion
Auteur Permeh Samanbar, Lau Kingsley, Boan Mayren Echeverria, Tansel Berrin, Duncan Matthew
Année de parution : 2020.
Type de document : Article de revue.
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Inhibition of sulfate-reducing bacteria influenced corrosion on hydrophobic poly(dimethylsiloxane) coatings

Résumé : Sulfate-reducing bacteria (SRB) has been pointed out as one of the causative agents of microbial induced corrosion in the marine environment. To address this problem, novel strategies are being experimented as against the earlier methods which have been banned due to their toxic effects on useful aquatic lives. Thus, the aim of this study was to investigate the effect of non-toxic perfluorodecyltrichlorosilane (PFDTS) on resistance of hydrophobic poly(dimethylsiloxane)/phosphoric acid-treated zinc oxide (PDMS/PA-treated ZnO) coatings to SRB-induced biofouling and corrosion. The surface features of the coatings before and after exposure to SRB/NaCl solution were analyzed by scanning electron microscopy (SEM). Wettability of the coatings before and after exposure was also measured. The interaction of SRB with the coatings was investigated by FTIR spectroscopy. The resistance performance of the modified coatings against SRB-induced corrosion was monitored by electrochemical impedance spectroscopy (EIS). The EIS measurements revealed that 0.20 g PFDTS-based coating displayed highest corrosion resistance with impedance modulus of 6.301 × 1010 after 15 d of exposure to SRB/NaCl medium. The results were corroborated by surface and chemical interaction analyses, and thus, indicate that 0.20 g PFDTS-modified PDMS/PA-treated ZnO coating has potentials for excellent SRB-induced corrosion resistance and anti-biofouling performance.
Domaine de référence : Biocorrosion
Auteur Arukalam Innocent O., Njoku C. N., Yang Lihui, Hou Baorong, Li Ying
Année de parution : 2020.
Mots-clés : Corrosion, Hydrophobic coating, Perfluorodecyltrichlorosilane, Poly(dimethylsiloxane), Sulfate-reducing bacteria.
Type de document : Article de revue.
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The Involvement of Bacteria in the Failure of a Carbon Steel Pipe

Résumé : In the raw water a lot of bacteria who play an important role in the corrosion of steels are present. These bacteria may initiate or accelerate corrosion processes because they are able of inducing localized changes in the aqueous environment, in terms of pH and oxygen concentration, destroying protective layers or creating corrosive deposits. This paper presents a study on the involvement of bacteria in the degradation of a pipe from raw water cooling system. Microbiological analysis of sampled sludge from internal surface of pipe emphasized the existence of some microorganisms: heterotrophic aerobe bacteria, iron oxidizing bacteria and sulphate-reducing bacteria. Investigation techniques of microbiologically influenced corrosion included metallographic analysis of the surface and X-ray diffraction analysis of samples taken from existing deposits. The results emphasized that the change of environmental chemistry under the developed biofilm by the bacteria, together with the corrosive products as a result of the metabolic activity of the bacteria, influenced the perforation of the pipeline.
Domaine de référence : Biocorrosion
Auteur Tunaru Mariana, Dinu Alice
Année de parution : 2020.
Type de document : Article de revue.
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Diversity of sulfate-reducing prokaryotes in petroleum production water and oil samples

Résumé : Microorganisms from oil reservoirs are associated with negative impacts on the oilfield, such as oil biodeterioration and biocorrosion of steel structures used for exploration, transportation and storage. The objectives of this study were to analyze the taxonomic and functional diversity in the production water and oil of two oil reservoirs, with emphasis on H2S producing bacteria. Total DNA from the microbial community was extracted, and the taxonomic and functional diversity was evaluated. The phyla Proteobacteria, Firmicutes and Euryarchaeota were the most abundant among the samples and contain the main sulfate-reducing species, such as Desulfovibrio alaskensis and Archeoglobus fulgidus. The production water and the oil were found to have taxonomic and functionally different microbial communities in the three communities, however correlation networks showed basically the same types of interconnected metabolism between the sulfidogenic microorganisms. This indicates the importance of understanding the microbial diversity and metabolic capacity of communities in these environments and trying to control harmful processes that may result in huge economic damage to the oil industry.
Domaine de référence : Biocorrosion
Auteur Santos Josenilda Carlos dos, Lopes Déborah Romaskevis Gomes, Da Silva Jéssica Duarte, De Oliveira Michelle Dias, Dias Roberto Sousa, Lima Helena Santiago, De Sousa Maíra Paula, De Paula Sérgio Oliveira, Silva Cynthia Canêdo da
Année de parution : 2020.
Mots-clés : 16S rRNA, Biocorrosion, Biosourcing, Functional prediction, Petroleum reservoir.
Type de document : Article de revue.
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Full Text PDF

Domaine de référence : Biocorrosion
Année de parution : 0.
Type de document : Pièce jointe.
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Etude des interactions bactéries-surfaces et des effets sur la passivation des aciers inoxydables

Résumé : Les aciers inoxydables doivent leur résistance à la corrosion à la formation d’une couche d’oxyde à leur surface, communément qualifiée de film passif, qui a une épaisseur de quelques nanomètres et se compose majoritairement d’oxydes et/ou d’hydroxydes de Fe(III) et de Cr(III). Cependant, dans des milieux agressifs, la stabilité de la couche d’oxyde peut être compromise, ce qui peut déclencher des phénomènes de corrosion (localisée ou généralisée). Par exemple, en présence de microorganismes, et plus particulièrement de bactéries, l’adhésion bactérienne et la formation d’un biofilm à la surface peut conduire à l’initiation et/ou à l’accélération des processus de corrosion : on parle alors de biocorrosion. Dans un premier temps, nous avons caractérisé la couche d’oxyde formée à la surface de l’acier inoxydable duplex 2304 par un couplage de techniques fines d’analyse des surfaces (XPS et ToF-SIMS). Nous avons notamment mis en évidence des différences concernant la composition chimique de la surface sur chacune des phases de l’alliage duplex. Dans un second temps, nous avons caractérisé la surface de l’alliage duplex au cours de l’adhésion de bactéries marines aérobies Pseudoalteromonas NCIMB 2021 en milieu marin par un couplage de techniques de caractérisation microscopiques (microscopie à épifluorescence, MEB et AFM), de techniques fines d’analyse des surfaces (XPS et ToF-SIMS) et de techniques électrochimiques (suivi du potentiel à l’abandon, courbes de polarisation anodiques et cathodiques). Nous avons notamment montré que la formation du biofilm s’accompagne de modifications de la couche d’oxyde.
Domaine de référence : Biocorrosion
Auteur Gardin Elise
Année de parution : 2018.
Type de document : Thèse.
Source : PSL Research University
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Microbial Nitrogen and Sulfur Metabolism and its Relation to Corrosion Risk on Offshore Oil Production Platforms

Résumé : The potential for microbiologically-influenced corrosion (MIC) of oilfield produced waters collected from the topsides of two offshore FPSO (floating, production, storage, and offloading) vessels exposed to various sulfur (S) and nitrogen (N) chemistries was investigated. Produced water was incubated at high temperature (54 °C) for 154 days with exposure to various nitrate and nitrite injection chemistries under sour and non-sour conditions, and microbial community analysis, N and S transformation monitoring, and corrosion coupon weight loss were used to assess MIC risk. Low concentrations of nitrate or nitrite (0.5 mM) did not effectively inhibit detrimental sulfate reduction by sulfate-reducing microorganisms (SRM), while 5 mM nitrate and nitrite treatments displayed successful sulfate reduction inhibition. Microbial community compositions did not differ dramatically between topside sampling locations from a single FPSO in response to various nitrate, nitrite, and sulfide treatments determined by microbial community analysis, however the microbial community structures between the two FPSO platforms revealed differences. The highest corrosion rates which may be MIC-attributed based on comparisons with sterile controls were measured in microcosms wherein no nitrate, nitrite or sulfide was added (0.48 mm/year). Despite its successful sulfate reduction inhibition, the addition of 5 mM nitrite into produced water microcosms conferred corrosion rates of up to 0.17 mm/year in sterile controls, indicating a chemical corrosion effect. In related work, the purification of the sulfide utilizing enzyme sulfide:quinone oxidoreductase (SQR) from Thiobacillus denitrificans was also performed successfully using a reproducible and scalable method for future use on a previously developed biosensor for sulfide detection. The knowledge gained from this thesis work can be used to inform the MIC risks associated with nitrate and nitrite injection within the topside machinery of offshore oil recovery operations, a previously poorly characterized environment. The efficient enzyme purification method offered in this thesis provides an avenue for continued development of a sulfide biosensor for future use in monitoring sulfidogenesis in produced water samples such as those on offshore oil production facilities.
Domaine de référence : Biocorrosion
Auteur Nicoletti Danika Susianne
Année de parution : 2020.
Type de document : Article de revue.
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Bacterial response mechanism during biofilm growth on different metal material substrates : EPS characteristics, oxidative stress and molecular regulatory network analysis

Résumé : Overwhelming growth of bacterial biofilms on different metal-based pipeline materials are intractable and pose a serious threat to public health when tap water flows though these pipelines. Indeed, the underlying mechanism of biofilm growth on the surface of different pipeline materials deserves detailed exploration to provide subsequent implementation strategies for biofilm control. Thus, in this study, how bacteria response to their encounters was explored, when they inhabit different metal-based pipeline substrates. Results revealed that bacteria proliferated when they grew on stainless steel (SS) and titanium sheet (Ti), quickly developing into bacterial biofilms. In contrast, the abundance of bacteria on copper (Cu) and nickel foam (Ni) substates decreased sharply by 4–5 logs within 24 h. The morphological shrinkage and shortening of bacterial cells, as well as a sudden 64-fold increase of carbohydrate content in extracellular polymeric substances (EPS), were observed on Cu substrate. Furthermore, generation of reactive oxygen species and fluctuation of enzymatic activity demonstrated the destruction of redox equilibrium in bacteria. Bacteria cultured on Cu substrate showed the strongest response, followed by Ni, SS and Ti. The oxidative stress increased quickly during the growth of bacterial biofilm, and almost all tested metal transporter-related genes were upregulated by 2–11 folds on Cu, which were higher than on other substrates (1–2 folds for SS and Ti, 2–9 folds for Ni). Finally, these behaviors were compared under the biofilm regulatory molecular network. This work may facilitate better understanding different response mechanisms during bacterial biofilm colonization on metal-based pipelines and provide implications for subsequent biofilm control.
Domaine de référence : Biocorrosion , Antifouling
Auteur Wang Jiaping, Li Guiying, Yin Hongliang, An Taicheng
Année de parution : 2020.
Mots-clés : Bacterial biofilm, EPS, Growth profiles, Metal-based pipeline materials, Oxidative stress.
Type de document : Article de revue.
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Microbially influenced corrosion – any progress ?

Résumé : Microbially influenced corrosion (MIC), is acknowledged to be the direct cause of catastrophic corrosion failures, with associated damage costs ranging to many billions of US$ annually. In spite of extensive research and numerous publications, fundamental questions relating to MIC remain unanswered. The following review provides an overview of current MIC research and stresses the lack of information related to MIC recognition, prediction and mitigation. The review establishes a link between management decisions and root causes. A holistic, proactive approach to MIC is suggested in which an entire system is considered, monitored and improved.
Domaine de référence : Biocorrosion
Auteur Little B. J., Blackwood D. J., Hinks J., Lauro F. M., Marsili E., Okamoto A., Rice S. A., Wade S. A., Flemming H. -C.
Année de parution : 2020.
Mots-clés : cathodic protection, microbially influenced corrosion, paint coatings.
Type de document : Article de revue.
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Investigations on biofilm forming bacteria involved in biocorrosion of carbon steel immerged in real wastewaters

Résumé : Bacteria are able to construct biofilm adjacent to carbon steel surface and leading to the biocorrosion and metal deterioration. The impact of wasterwaters’ indigenious bacteria on biocorrosion of carbon steel was evaluated under different pH values (3,7 and 9), two chloride concentrations (0.5 g/L and 1.5 g/L), and for two wastewaters. In tannery wastewaters (TWW) and under pH 3, Pseudomonas aeruginosa sp. (MN788665) and Enterobacter aerogenes sp. (MN788688) were able to establish an irreversible adhesion on the first stage of biofilm formation on the carbon steel surface due to hydrophobic behaviour of the bacteria. However, under the same pH, bacteria from industrial wastewaters (IWW) such us Brevundimonas diminuta sp. (MN788672) and Enterobacter aerogenes sp. (MN788689) promote the reversible adhesion followed by a continuous attachment and consequently a limited biofilm. Subsequently, in TWW and 0.5 g/L of chlorides, indigenious bacteria like Enterobacter aerogenes sp. (MN790737) and Raoultella ornithinolytica sp. promote an irreversible attachment of biofilm enhanced by their hydrophobic property contrarily to the bacteria isolated in the medium at chloride concentration of 1.5 g/L. In IWW, 1.5 g/L of chlorides the biofilm attachment is reversible and therefore its inhibition role is of little influence.
Domaine de référence : Biocorrosion
Auteur El-Bassi Leila, Ziadi Islem, Belgacem Sabrine, Bousselmi Latifa, Akrout Hanene
Année de parution : 2020.
Mots-clés : Biocorrosion, Biofilm, Carbon steel, Electrochemical impedance spectroscopy, Microbial cell surface.
Type de document : Article de revue.
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Microbiologically influenced corrosion of stainless steel by sulfate reducing bacteria â A tale of caution

Résumé : The influence of different experimental media composition and air purging on the potential for microbiologically influenced corrosion (MIC) of 304 stainless steel with sulfate reducing bacteria (SRB) was investigated. Modified Baarâs (MB) medium, MB medium without iron ions and supplemented with sodium chloride (MBN) and air purged MBN medium (MBO) were used. Pitting corrosion attack was found on the surface of the coupons for all of the conditions tested including the abiotic tests, and detailed statistical analysis showed no significant difference between the pitting results. General corrosion and maximum pit penetration rates also showed no difference between the coupons exposed to different test conditions. Interestingly, the pits found on the surface of the coupons in all the tested conditions were comparable in size/shape and depth to that of the inclusions present on the surface of the stainless steel coupons. These findings suggest that (i) the test conditions studied do not lead to increased corrosion rates of stainless steel with SRBs and (ii) care needs to be taken to avoid the pitfall of misinterpreting the corrosion of inclusions present on the surface of stainless steels, which can occur as a result of cleaning of the coupons, as MIC pits.
Domaine de référence : Biocorrosion
Auteur Javed Muhammad Awais, Neil Wayne, McAdam Grant, Moreau John, Wade Scott
Année de parution : 2020.
Type de document : Article de revue.
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A systems-based approach for modeling of microbiologically influenced corrosion implemented using static and dynamic Bayesian networks

Résumé : Microbiologically influenced corrosion (MIC) is a microbial community assisted degradation of materials affecting chemical processing and oil and gas industries. MIC has been implicated in incidents involving loss of containment of hazardous hydrocarbons which have led to fires and explosions, economic and environmental impact. The interplay between abiotic environmental factors and dynamic biotic factors in MIC are poorly understood. There is a lack of mechanistic understanding of MIC and very few models are available to predict or assess MIC threat. Here we report on the development of a model to assess the susceptibility to MIC. The high-resolution model utilizes 60 independent nodes, including operational and historical failure analysis data, and is built by combining empirical relationships between the abiotic and biotic variables impacting MIC. Both static and dynamic Bayesian-network (BN) approaches were used to combine heuristic and quantitative states of variables to ultimately yield a susceptibility measure for MIC. A confidence-in-information metric was generated to reflect the amount of data used in the estimation. A susceptibility to MIC of 45%–60% was estimated by the model for ten different scenarios simulated using case-studies from literature. The susceptibility to MIC estimated by these scenarios was further interpreted in the context of these cases. This systems-based MIC model can be utilized as an independent estimator of susceptibility or can be incorporated as a sub-model within comprehensive safety threat assessment models currently utilized in industry.
Domaine de référence : Biocorrosion
Auteur Kannan Pranav, Kotu Susmitha Purnima, Pasman Hans, Vaddiraju Sreeram, Jayaraman Arul, Mannan M. Sam
Année de parution : 2020.
Mots-clés : Bayesian network, Dynamic Bayesian network, Microbiologically influenced corrosion, Process safety, Systems based model.
Type de document : Article de revue.
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Compositions and Methods to Prevent and Treat Biofilms

Résumé : Compositions and methods to treat biofilms are disclosed based on the discovery of the role of the disaccharide trehalose in microbial biofilm development. In various embodiments to treat body-borne biofilms systemically and locally, the method includes administering trehalase, the enzyme which degrades trehalose, in combination with other saccharidases for an exposition time sufficient to adequately degrade the biofilm gel matrix at the site of the biofilm. The method also includes administering a combination of other enzymes such as proteolytic, fibrinolytic, and lipolytic enzymes to break down proteins and lipids present in the biofilm, and administering antimicrobials for the specific type(s) of infectious pathogen(s) underlying the biofilm. Additionally, methods are disclosed to address degradation of biofilms on medical device surfaces and biofilms present in industrial settings.
Domaine de référence : Biocorrosion
Auteur Ivanova Svetlana A., Davis Dennis W., Arenz Brad W., Connellan Thomas K.
Année de parution : 2020.
Type de document : Brevet.
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Effect of CO32− Concentration on the Corrosion Behavior of X80 Pipeline Steel in Simulated Soil Solution

Résumé : In this paper, the effect of CO32−concentration on the corrosion behavior of pipeline steels was studied by using potentiodynamic polarization and electrochemical impedance methods in a high-pH simulated soil solution. The results showed that the corrosion of X80 pipeline steel in a Na2CO3 solution involved a self-passivation mechanism. As the CO32−concentration increased, the protective performance of the passivated film increased, whereas the corrosion rate decreased. When 1 mol/L NaHCO3 was added, the corrosion followed an active-passive mechanism and displayed two anodic peaks. Moreover, the influence of the CO32−concentration was different from that of NaHCO3, the NaHCO3 addition increased the corrosion current density, which consequently increased the corrosion rate.
Domaine de référence : Biocorrosion
Auteur School of Chemistry and Chemical Engineering, Xi’an University of Architecture and Technology, Xi'an, China, Li Zhang Qiu
Année de parution : 2020.
Type de document : Article de revue.
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Biosurfactants : Eco-Friendly and Innovative Biocides against Biocorrosion

Résumé : Corrosion influenced by microbes, commonly known as microbiologically induced corrosion (MIC), is associated with biofilm, which has been one of the problems in the industry. The damages of industrial equipment or infrastructures due to corrosion lead to large economic and environmental problems. Synthetic chemical biocides are now commonly used to prevent corrosion, but most of them are not effective against the biofilms, and they are toxic and not degradable. Biocides easily kill corrosive bacteria, which are as the planktonic and sessile population, but they are not effective against biofilm. New antimicrobial and eco-friendly substances are now being developed. Biosurfactants are proved to be one of the best eco-friendly anticorrosion substances to inhibit the biocorrosion process and protect materials against corrosion. Biosurfactants have recently became one of the important products of bioeconomy with multiplying applications, while there is scare knowledge on their using in biocorrosion treatment. In this review, the recent findings on the application of biosurfactants as eco-friendly and innovative biocides against biocorrosion are highlighted.
Domaine de référence : Biocorrosion
Auteur Płaza Grażyna, Achal Varenyam
Année de parution : 2020.
Mots-clés : biocorrosion, biofilm, biosurfactants, corrosion, microbiologically induced corrosion (MIC).
Type de document : Article de revue.
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Accelerated corrosion of 316L stainless steel caused by Shewanella algae biofilm

Résumé : In marine environment, microbiologically influenced corrosion (MIC) is a major problematic issue, which leads to severe damage to metals and alloys. The prerequisite to mitigate this worldwide problem is to investigate the mechanisms of marine corroding microbes. Therefore, the corrosion behavior of 316L stainless steel in the presence of marine Shewanella algae was investigated by means of electrochemical measurements and surface analysis. The results revealed that S. algae is capable of forming a dense and thick biofilm on the surfaces of 316L SS coupons after 7 days of incubation which reached about a thickness of 40.4 μm. According to electrochemical results, S. algae biofilm also induced the corrosion of 316L SS coupons. The accelerated corrosion of 316L SS coupons was in form of pits, which was formed underneath the biofilms. The largest pit depth after 14 days of incubation time reached 9.8 μm, which was 6.7 times higher than the one immersed in abiotic medium (1.45 μm). This is the first study demonstrating the MIC of 316L SS due to S. algae biofilm.
Domaine de référence : Biocorrosion
Auteur Kalnaowakul Phuri, xu dake, Rodchanarowan Aphichart
Année de parution : 2020.
Type de document : Article de revue.
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Operational safety assessment of offshore pipeline with multiple MIC defects

Résumé : Microbiologically influenced corrosion (MIC) creates multiple defects. The interaction of MIC defects and their time dependence need to be considered for robust safety assessment of the asset. This paper presents a methodology for the dynamic safety assessment of the assets under the influence of MIC. The methodology is built by integrating the Bayesian Network (BN)-Markov Mixture (MM) technique with Monte Carlo simulation. The integration of BN and MM provides an empirical model to probabilistically predict the effective defect growth rate based on the multiple defects’ interaction. A rate-dependent stochastic formulation is also developed for the remaining strength and safe operating pressure prediction using the Monte Carlo simulation. The proposed methodology dynamically predicts and captures the evolving effect of corrosion defects’ interaction and effective defect growth rate on the remaining strength and survival likelihood of an in-service corroding asset. The methodology is tested on an offshore pipeline, and the dynamic effects of corrosion influencing parameters and defects’ interaction on the pipeline survivability were predicted. Critical safety influencing factors of the pipeline under complex microbial biofilm architecture were identified. The proposed methodology provides a parametric-based condition monitoring tool for effective management of MIC and ensuring safety in offshore systems.
Domaine de référence : Biocorrosion
Auteur Adumene Sidum, Khan Faisal, Adedigba Sunday
Année de parution : 2020.
Mots-clés : Markov mixture, Pipeline, Dynamic safety, Defects interaction, Microbiologically influenced corrosion, Monte Carlos Simulation, Residual strength, Bayesian network.
Type de document : Article de revue.
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Microbial enhanced corrosion of hydraulic concrete structures under hydrodynamic conditions : Microbial community composition and functional prediction

Résumé : Microbial corrosion has long been a threat to engineered structures, but the effects of microbial action on hydraulic concrete structures (HCSs), particularly those in freshwater environments, have not been systematically investigated. In this study, the composition and succession of bacterial communities in biofilms attached to HCSs and the mass loss of concrete were analyzed in a simulated hydrodynamic reactor. After a 335-day experiment, the mass losses of aseptic concrete in flowing and static water were 3.55% and 2.96%, respectively. Biofilms clearly formed on concrete cultured in representative freshwater, and the mass losses of biofilm-attached concrete placed in flowing and static water were 4.65% and 4.04%, respectively, at the end of the experiment. These results indicate that microbial action was actively involved in the corrosion process, contributing 32.3–36.6% of the total mass loss. Obvious differences were found in the microbial community distribution under flowing and static water conditions, in which temperature and surface pH were the main factors. The formation of a relatively stable community structure of attached biofilms was observed in flowing water since day 165, whereas the community structure plateaued and was prolonged to 225 days for concrete cultivated in static water. A functional prediction analysis revealed that functional bacteria related to nitrogen and sulfur metabolism accounted for 70% of all functionally metabolizing bacteria cultivated under both conditions. The abundances of sulfate reducers and nitrite reducers decreased remarkably with the succession of microbial communities in flowing and static water, while the percentages of sulfur oxidizers and sulfide oxidizers increased gradually. Our results provide future hypotheses for more quantitative studies focusing on special groups and functional genes in HCSs and contribute to optimizing microbial control in water conservancy projects for freshwater environments.
Domaine de référence : Biocorrosion
Auteur Li Yi, Wan Mingyue, Du Jiming, Lin Li, Cai Wei, Wang Longfei
Année de parution : 2020.
Mots-clés : Biofilm, Corrosion, Functional prediction, Hydraulic concrete structures, Microbial action.
Type de document : Article de revue.
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Microbial Corrosion Study Using Tafel Principles of Polarization

Résumé : Microbial corrosion is studied and analyzed. Three metals were considered for the outgoing study, Aluminum, Al-7.975Si-3.45Mg alloy, Stainless Steel, AISI316, and Low Carbon Steel. The metals corrosion is considered by three types of water, distillated, tap, and lichen. Results of exposing the metal samples in three types for a specific time intervals were analyzed. Lichen water has shown the most corrosion effect due to Sulfate Reducing Bacteria (SRB). Weight loss, corrosion potential and current were measured and results illustrated that Aluminum has the most MIC resistance, 1.509mpy, then, stainless steel,2.38 mpy came in second and Carbon Steel 3.38 mpy. It has been noticed the increasing in potential negativity and in current in lichen water opposing to tap and distillate wate
Domaine de référence : Biocorrosion
Auteur Noori Amer F., Moustafa Nader M., Hamid Katea L.
Année de parution : 2020.
Type de document : Article de revue.
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Green and eco-benign corrosion inhibition agents : Alternatives and options to chemical based toxic corrosion inhibitors

Résumé : The control of corrosion of metal and its alloy dissolution in environments that induce corrosion has been reviewed showing successes recorded in the search for alternative inhibitors that would replace toxic and expensive inhibitors that in some instances require rigorous process of synthesis. Studies show that organic compounds, drugs, polymers and extracts from plant have been used. It also shows that in an effort to improve the efficiency of the developed inhibitors quite a number of them have been synergized with halide ions and surfactants. The mode of adsorption mechanism for majority of the tested inhibitor alternatives is also highlighted.
Domaine de référence : Biocorrosion
Auteur Izionworu Vincent Onuegbu, Ukpaka Chukwuemeka Peter, Oguzie Emeke Emmanuel
Année de parution : 2020.
Type de document : Article de revue.
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Plus de références Biocorrosion


• Antifouling icone-flux-rss

An experimental test of stationary lay-up periods and simulated transit on biofouling accumulation and transfer on ships

Résumé : Biofouling accumulation on ships’ submerged surfaces typically occurs during stationary periods that render surfaces more susceptible to colonization than when underway. As a result, stationary periods longer than typical port residence times (hours to days), often referred to as lay-ups, can have deleterious effects on hull maintenance strategies, which aim to minimize biofouling impacts on ship operations and the likelihood of invasive species transfers. This experimental study tested the effects of different lay-up durations on the magnitude of biofouling, before and after exposure to flow, using fouling panels with three coating treatments (antifouling, foul-release, and controls), at two sites, and a portable field flume to simulate voyage sheer forces. Control panels subjected to extended stationary durations (28-, 45- and 60-days) had significantly higher biofouling cover and there was a 13- to 25-fold difference in biofouling accumulation between 10-days and 28-days of static immersion. Prior to flume exposure, the antifouling coating prevented biofouling accumulation almost entirely at one site and kept it below 20% at the other. Foul-release coatings also proved effective, especially after flume exposure, which reduced biofouling at one site from >52% to <6% cover (on average). The experimental approach was beneficial for co-locating panel deployments and flume processing using a consistent (standardized) flow regime on large panels across sites of differing conditions and biofouling assemblages. While lay-ups of commercial vessels are relatively common, inevitable, and unavoidable, it is important to develop a better understanding of the magnitude of their effects on biofouling of ships’ submerged surfaces and to develop workable post-lay-up approaches to manage and respond to elevated biofouling accumulation that may result.
Domaine de référence : Antifouling
Auteur Davidson Ian C., Smith George, Ashton Gail V., Ruiz Gregory M., Scianni Christopher
Année de parution : 2020.
Mots-clés : Antifouling coating, flume, foul-release coating, introduced species, lay-up, ship biofouling.
Type de document : Article de revue.
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Increasing flow rate reduces biofouling and colonization by filamentous bacteria in drippers fed with reclaimed wastewater

Résumé : <p>The clogging of drippers due to the development of biofilms reduces the benefits and is an obstacle to the implementation of drip irrigation technology. The geometry of the dripper channel has an impact on the flow behaviours and head loss. The objective of this study was to analyse the influence of hydrodynamic parameters of three types of drippers (flow rates of 1, 2 and 4 l.h-1) fed by reclaimed wastewater on biofilm development kinetics and on the bacterial community. Using optical coherence tomography, we demonstrated that the inlet of the drippers (mainly the first baffle) and vortex zones are the most sensitive area for biofouling. Drippers with the lowest flow rate (1 l.h-1) and the smallest channel section were the favourable areas to biofouling. The low inlet velocity (0.34 m.s-1) in this type of dripper compared to 2 l.h-1 (0.61 25 m.s-1) and 4 l.h-1 (0.78 m.s-1) drippers can favour the deposition and development of biofilms. In addition, the water velocity influenced the structure of the bacterial communities in the biofilm. Low velocity (0.34 m.s-1) favoured the presence of Hydrogenophaga and Pseudoxanthomonas genera at the early stage of biofilm formation and filamentous bacteria belonging to Chloroflexi phylum at the end. So, maintaining a high flow rate and using drippers with a large flow cross-section is an effective way to control the development of biofilms by limiting the presence of filamentous bacteria.</p>
Domaine de référence : Antifouling
Auteur Lequette Kevin, Ait-Mouheb Nassim, Wery Nathalie
Année de parution : 2020.
Type de document : Article de revue.
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Recent Developments and Practical Feasibility of Polymer-Based Antifouling Coatings

Résumé : While nature has optimized its antifouling strategies over millions of years, synthetic antifouling coatings have not yet reached technological maturity. For an antifouling coating to become technically feasible, it should fulfill many requirements: high effectiveness, long-term stability, durability, ecofriendliness, large-scale applicability, and more. It is therefore not surprising that the search for the perfect antifouling coating has been going on for decades. With the discovery of metal-based antifouling paints in the 1970s, fouling was thought to be a problem of the past, yet its untargeted toxicity led to serious ecological concern, and its use became prohibited. As a response, research shifted focus toward a biocompatible alternative: polymer-based antifouling coatings. This has resulted in numerous advanced and innovative antifouling strategies, including fouling-resistant, fouling-release, and fouling-degrading coatings. Here, these novel and exciting discoveries are highlighted while simultaneously assessing their antifouling performance and practical feasibility.
Domaine de référence : Antifouling
Auteur Maan Anna M. C., Hofman Anton H., Vos Wiebe M. de, Kamperman Marleen
Année de parution : 0.
Mots-clés : antifouling, biomimetic materials, polymer brushes, stimuli-responsive materials, surface modification.
Type de document : Article de revue.
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Anti-Adhesion Behavior from Ring-Strain Amine Cyclic Monolayers Grafted on Silicon (111) Surfaces

Résumé : In this manuscript, a series of amine tagged short cyclic molecules (cyclopropylamine, cyclobutylamine, cyclopentylamine and cyclohexylamine) were thermally grafted onto p-type silicon (111) hydride surfaces via nucleophilic addition. The chemistries of these grafting were verified via XPS, AFM and sessile droplet measurements. Confocal microscopy and cell viability assay was performed on these surfaces incubated for 24 hours with triple negative breast cancer cells (MDA-MB 231), gastric adenocarcinoma cells (AGS) endometrial adenocarcinoma (Hec1A). All cell types had shown a significant reduction when incubated on these ring-strain cyclic monolayer surfaces than compared to standard controls. The expression level of focal adhesion proteins (vinculin, paxilin, talin and zyxin) were subsequently quantified for all three cell types via qPCR analysis. Cells incubate on these surface grafting were observed to have reduced levels of adhesion protein expression than compared to positive controls (collagen coating and APTES). A potential application of these anti-adhesive surfaces is the maintenance of the chondrocyte phenotype during in-vitro cell expansion. Articular chondrocytes cultured for 6 days on ring strained cyclopropane-modified surfaces was able to proliferate but had maintained a spheroid/aggregated phenotype with higher COL2A1 and ACAN gene expression. Herein, these findings had help promote grafting of cyclic monolayers as an viable alternative for producing antifouling surfaces.
Domaine de référence : Antifouling
Auteur Ching Jing Yuan, Huang Brian J., Hsu Yu-Ting, Khung Yit Lung
Année de parution : 2020.
Type de document : Article de revue.
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An investigation into the effect of hard fouling on the ship resistance using CFD

Résumé : Biofouling is the colonization of underwater surfaces by microorganisms, plants, algae or animals and can be divided into soft and hard fouling. Soft fouling is consisted of algae, slime and grasses and typically has a lower impact on the performance of the ship than hard fouling, which has a calcareous structure. Furthermore, hard fouling can be extremely detrimental to the performance of machinery and coating systems. Within this paper, the effect of hard fouling on the ship resistance is assessed utilizing Computational Fluid Dynamics (CFD). The roughness function model for the hard fouling is implemented within the wall function of the CFD software. Afterwards, numerical simulations of fouled flat plates are performed, and the obtained results are verified and validated with the experimental results published in the literature. Once validated, numerical simulations with implemented roughness function model and roughness length scale, proposed in the literature, can be used for the determination of the effect of hard fouling on the resistance of any arbitrary body. Lastly, the effects of hard fouling on the resistance characteristics of two merchant ships at full-scale are determined utilizing the validated CFD model. Benefits of the proposed method for the determination of the effect of hard fouling on the ship resistance are highlighted and discussed.
Domaine de référence : Antifouling
Auteur Farkas Andrea, Degiuli Nastia, Martić Ivana
Année de parution : 2020.
Mots-clés : CFD, Container ship, Crude carrier, Hard fouling, Resistance characteristics.
Type de document : Article de revue.
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Propeller Performance Penalty of Biofouling : Computational Fluid Dynamics Prediction

Domaine de référence : Antifouling
Auteur Song Soonseok, Demirel Yigit Kemal, Atlar Mehmet
Année de parution : 2020.
Type de document : Article de revue.
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Fluorinated diols modified polythiourethane copolymer for marine antifouling coatings

Résumé : The development of environmentally friendly alternatives is a crucial issue, since the prohibition of tributyltin (TBT)-based antifouling coatings. In this work, a series of fluorinated diols modified polythiourethane (HO-FPTU-x) have been synthesized via a simple and convenient polymerization reaction with HDI, PETMP and various of 2,3,5,6-tetrafluoro-1,4-benzenedimethanol (HOCH2-FB-Al) at the room temperature, and their antifouling properties are explored as well. The laboratory assays and marine field tests (6 months) show that the HO-FPTU-7.5 (with 7.5 wt% HOCH2-FB-Al) coating has shown excellent antifouling/fouling release properties. The side chains of the HO-FPTU polymers simultaneously contain hydrophobic and hydrophilic groups, which construct an “ambiguous’’ surface after immersing into water. The marine organisms may be “confused’’ by the “ambiguous’’ surface and be removed easily during settlement and adhesion. This work provides a facile strategy for designing environment friendly marine antifouling coatings.
Domaine de référence : Antifouling
Auteur Xie Songbo, Wang Jing, Wang Lida, Sun Wen, Lu Zhaoxia, Liu Guichang, Hou Baorong
Année de parution : 2020.
Mots-clés : Amphiphilic, Antifouling coatings, Fluorinated diols, Polythiourethane.
Type de document : Article de revue.
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Novel marine antifouling coatings inspired by corals

Résumé : Biofouling is a major problem facing the marine industry. Since toxic antifouling coatings were banned globally due to their negative impacts on the marine environment, the development of environmental-friendly and efficient antifouling coatings has been identified as a pressing need. As an alternative, the antifouling coatings inspired by corals have attracted a great deal of attention over these years. within the marine environment, corals have evolved an excellent antifouling capability. There are five major antifouling strategies applied by corals, including natural antifoulants, foul release effect, sloughing effect, soft tentacles, and fluorescence effect. In this paper, a brief review is conducted to introduce the antifouling coatings inspired by the five strategies. Moreover, a discussion is conducted about the existing problems with the five strategies and the direction of their further development is indicated.
Domaine de référence : Antifouling
Auteur Tian L., Yin Y., Jin H., Bing W., Jin E., Zhao J., Ren L.
Année de parution : 2020.
Mots-clés : Bioinspired antifouling coatings, Chemical strategy, Corals, Marine biofouling, Physical strategy.
Type de document : Article de revue.
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Electrodeposition of capsaicin-induced ZnO/Zn nanopillar films for marine antifouling and antimicrobial corrosion

Résumé : Zinc oxide with the morphology of nanopillar is promising marine antifouling materials as they can kill adhered bacteria and fungi. The zinc oxide with the morphology of nanopillar has shown super-antibacterial properties on galvanized steel, which makes ZnO/Zn nanopillar films promising in marine antifouling and antimicrobial corrosion. Thus, an efficient approach to coat ZnO/Zn nanopillar films on steel is of great significance. The electrodeposition method is a universal method for both ZnO crystals and galvanized coatings, and it can control the morphologies and structures of the resultant films. Therefore, in this study, capsaicin was added into an alkaline electrolyte to induce the formation of ZnO nanopillars. Due to capsaicin addition to the electrolyte, ZnO/Zn nanopillar films were obtained in a single cathodic electrodeposition. The added capsaicin in the electrolyte was absorbed on the electrodepositing surface by the functional –NH– groups in amide bond. The Zn(OH)42− diffusion was promoted by negatively shifted electrodepositing potential. The scanning electron microscopy (SEM) and X-ray diffraction (XRD) results illustrate that regular ZnO nanopillars were obtained when the capsaicin concentration was 0.6 g L−1 in the electrolyte. The resultant ZnO/Zn nanopillar films showed high antibacterial properties in Escherichia coli suspended solutions and relatively low living bacterial coverage, indicating promising application in marine antifouling. Electrochemical evaluation revealed that the obtained capsaicin-induced ZnO/Zn nanopillar films exhibited significantly enhanced corrosion resistance in a sulfate-reducing bacteria (SRB) medium. Moreover, the results illustrate that adding 0.6 g L−1 concentration of capsaicin in the electrolyte yielded the best films, which featured the lowest bacterial coverage and highest corrosion resistance.
Domaine de référence : Antifouling
Auteur Zhai Xiaofan, Ju Peng, Guan Fang, Ren Yadong, Liu Xin, Wang Nan, Zhang Yimeng, Duan Jizhou, Wang Chuanxing, Hou Baorong
Année de parution : 2020.
Mots-clés : Capsaicin, Corrosion resistance, Electrodeposition, Marine antifouling, Sulfate-reducing bacteria, Zinc oxide nanopillars.
Type de document : Article de revue.
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Influence of ns laser texturing of AISI 316L surfaces for reducing bacterial adhesion

Résumé : Nanosecond pulsed laser texturing has been performed on stainless steel with the objective of developing surface treatments to reduce bacterial adhesion on mechanical components in food handling machinery. The adhesion of Escherichia coli (E. coli) on four distinct textures has been investigated with standardised protocols for measurement of antibacterial performance. Surface morphology has been studied in detail for each texture to ascertain the presence of hierarchical structures and determine the role of topography in reducing bacterial adhesion. Despite the absence of sub-micrometric features comparable with bacterial size, this work highlights the crucial role that nanosecond pulsed laser irradiation plays in promoting a thin layer of iron oxide that reduces E. coli adhesion through local repulsive electrostatic interactions.
Domaine de référence : Antifouling
Auteur Romoli Luca, Lazzini Gianmarco, Lutey Adrian H. A., Fuso Francesco
Année de parution : 2020.
Mots-clés : Antibacterial, Laser, Texture.
Type de document : Article de revue.
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Marine Cable Device Adapted for the Prevention of Fouling

Résumé : The present invention provides a marine cable device configured for preventing or reducing biofouling along its exterior surface, which during use is at least temporarily exposed to water. The marine cable device according to the present invention comprises at least one light source configured to generate an anti-fouling light and at least one optical medium configured to receive at least part of the anti-fouling light. The optical medium comprises at least one emission surface configured to provide at least part of said anti-fouling light on at least part of said exterior surface.
Domaine de référence : Antifouling
Auteur Hietbrink Roelant Boudewijn, Salters Bart Andre, Luck Sean M.
Année de parution : 2020.
Type de document : Brevet.
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Antibiofilm, Antifouling, and Anticorrosive Biomaterials and Nanomaterials for Marine Applications

Résumé : Formation of biofilms is one of the most serious problems affecting the integrity of marine structures both onshore and offshore. These biofilms are the key reasons for fouling of marine structures. Biofilm and biofouling cause severe economic loss to the marine industry. It has been estimated that around 10% of fuel is additionally spent when the hull of ship is affected by fouling. However, the prevention and control treatments for biofilms and biofouling of marine structures often involve toxic materials which pose severe threat to the marine environment and are strictly regulated by international maritime conventions. In this context, biomaterials for the treatment of biofilms, fouling, and corrosion of marine structures assume much significance. In recent years, due to the technological advancements, various nanomaterials and nanostructures have revolutionized many of the biological applications including antibiofilm, antifouling, and anticorrosive applications in marine environment. Many of the biomaterials such as furanones and some polypeptides are found to have antibiofilm, antifouling, and anticorrosive potentials. Many of the nanomaterials such as metal (titanium, silver, zinc, copper, etc.) nanoparticles, nanocomposites, bioinspired nanomaterials, and metallic nanotubes were found to exhibit antifouling and anticorrosive applications in marine environment. Both biomaterials and nanomaterials have been used in the control and prevention of biofilms, biofouling, and corrosion in marine structures. In recent years, the biomaterials and nanomaterials were also characterized to have the ability to inhibit bacterial quorum sensing and thereby control biofilm formation, biofouling, and corrosion in marine structures. This chapter would provide an overview of the biomaterials from diverse sources and various category of nanomaterials for their use in antibiofilm, antifouling, and anticorrosion treatments with special reference to marine applications.
Domaine de référence : Antifouling
Auteur Jayaprakashvel Mani, Sami Mnif, Subramani Ramesh, Prasad Ram, Siddhardha Busi, Dyavaiah Madhu
Année de parution : 2020.
Mots-clés : Antibiofilm, Anticorrosion, Antifouling, Biomaterials, Marine structures, Nanomaterials.
Type de document : Chapitre de livre.
Source : Springer International Publishing
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Carbon Nanotube-Based Antimicrobial and Antifouling Surfaces

Résumé : Carbon nanotubes (CNTs) are versatile nanomaterials with outstanding properties that can be used in different fields. This chapter reviews the use of single- and multi-walled CNTs in the development of antimicrobial and antifouling surfaces. The performance of CNT-containing surfaces seems to depend on a multiplicity of factors that can be conjugated in order to improve their activity. A substantially higher body of knowledge has accumulated regarding the use of multi-walled CNTs and their composites and exciting developments in CNT modification and combination with different molecules are being reported. Although some of the available results are promising, contradictory findings suggest that further investigation is needed to validate the antimicrobial and antifouling activities of developed surfaces in a wider range of conditions. The existing evidence seems to indicate that CNTs and their composites will remain a promising strategy to delay bacterial adhesion and reduce biofilm formation in very different environments.
Domaine de référence : Antifouling
Auteur Teixeira-Santos R., Gomes M., Mergulhão F. J., Snigdha S., Thomas Sabu, Radhakrishnan E. K., Kalarikkal Nandakumar
Année de parution : 2020.
Mots-clés : Antifouling activity, Antimicrobial activity, Nanocomposites, Single- and multi-walled carbon nanotubes, Surfaces.
Type de document : Chapitre de livre.
Source : Springer
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Influences and impacts of biofouling in SWRO desalination plants

Résumé : The ability to produce fresh potable water is an ever-growing challenge, especially with an increase in drought conditions worldwide. Due to its capacity to treat different types of water, reverse osmosis (RO) technology is an increasingly popular solution to the water shortage problem. The major restriction associated with the treatment of water by RO technology is the fouling of the RO membrane, in particular through biofouling. Membrane fouling is a multifaceted problem that causes an increase in operating pressure, frequent cleaning and limited membrane lifespan. The current paper summarizes the impact of biofouling of RO membranes used in seawater desalination plants. Following a brief introduction, the elements that contribute to biofouling are discussed: biofilm formation, role of extracellular polymeric substances (EPS), marine environment, developmental phases of biofouling. Following this, is a section on the implications of membrane biofouling especially permeate flux and salt rejection. The final section focuses on the new phenomenon of compression and hydraulic resistance of biofilms. Lastly, considerations on future research requirements on biofouling and its control in seawater reverse osmosis (SWRO) membrane systems are presented at the end of the article.
Domaine de référence : Antifouling
Auteur Jamieson Tamar, Leterme Sophie C.
Année de parution : 2020.
Mots-clés : Aggregates, biofilm, transparent exopolymer particles (TEP).
Type de document : Article de revue.
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Hydrophilic/Hydrophobic Heterogeneity Anti-Biofouling Hydrogels with Well-regulated Rehydration

Résumé : Hydrogels, as a representative of soft and biocompatible material, have been widely used in biosensors, biomedical devices, soft robotics, and the marine industry. However, the ir-recoverability of hydrogels after dehydration, which will cause the loss of original mechanical, optical and wetting properties, has severely restricted their practical applications. At present, this critical challenge of maintaining hydrogels’ accurate character has caused less attention. To address this, here we report a hydrogel based on synergistic effects to achieve both the well-regulated rehydration and deswelling properties. The hydrogel after dehydration can quickly restore its’ original state both on the macro and micro scale. In addition, the hydrogel has excellent mechanical stability after several dehydration-rehydration cycles. All of these properties offer a possibility of water condition endurance and increase the service life. The robust property is attributed to the hydrophilic-hydrophobic and ionic interactions induced by the synergy of hydrophilic/oleophilic hetero-networks. Moreover, zwitterionic segments as hydrophilic network play a vital role to fabricate anti-biofouling hydrogels. The durable and reusable hydrogel may have promising applications for biomedical materials, flexible devices and the marine industry.
Domaine de référence : Antifouling
Auteur Su Xin, Hao Dezhao, Xu Xiuqi, Guo Xinglin, Li Zhengning, Jiang Lei
Année de parution : 2020.
Type de document : Article de revue.
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Ecofriendly Synthesis of Biopolymer Nanocomposites and Its Application as a Potent Marine Antifouling Agent

Résumé : The undesirable colonization of anthropogenic surfaces by organisms in the marine environment is stated as marine biofouling. The biofouling of marine systems is a global concern, with economic impact estimated at billions of dollars. The widely used antifouling biocides including tributyltin tin (TBT) have been previously assimilated into marine paints. Although it has remarkable antifouling performance, it is toxic to the marine environment. Therefore, it is essential to develop ecofriendly antifouling compounds. In the recent times, the physical, chemical, and mechanical properties of nanomaterials have considerably improved the potential applications ranging from environment and energy to healthcare compared with those of bulk materials. Marine antifouling coating is the most effective way for avoiding marine organism attachment till date. However, the cost associated with the commercial antifouling agents and their maintenance is quite high. Therefore, it is indispensable to develop ecofriendly antifouling compounds. This chapter discusses ecofriendly method to produce biopolymer and nanomaterials conglomerating the antimicrobial property of nanoparticles and the unique structure of the biopolymer PHB against marine biofouling.
Domaine de référence : Antifouling
Auteur Kavitha G., Inbakanadan D., Gothandam K. M., Ranjan Shivendu, Dasgupta Nandita, Lichtfouse Eric
Année de parution : 2020.
Mots-clés : Bioplastic, Ecofriendly nanocomposite, Polyhydroxybutyrate.
Type de document : Chapitre de livre.
Source : Springer International Publishing
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A Green Approach to Modify Surface Properties of Polyamide Thin Film Composite Membrane for Improved Antifouling Resistance

Résumé : A green approach based on plasma enhanced chemical vapour deposition (PECVD) method was adopted in this work to modify surface properties of thin film composite (TFC) membranes for improved antifouling resistance during desalination process. Two types of hydrophilic monomers, i.e., acrylic acid (AA) and 2-hydroxyethyl methacrylate (HEMA) was respectively deposited onto the surface of commercial TFC membranes (XLE and NF270) and the effect of plasma deposition time (15 s, 1 min and 5 min) on the membrane physiochemical properties was investigated using different analytical instruments. The deposition of AA and HEMA was able to improve the membrane hydrophilicity owing to the presence of hydroxyl and carboxyl functional groups. However, prolonged plasma polymerization period was not encouraged as it led to the formation of thicker skin layer that significantly reduced water permeability. With 15-s plasma deposition time, AA and HEMA-modified XLE and NF270 membranes could achieve higher NaCl and Na2SO4 rejections as well as demonstrate 100% flux recovery rate. The improved antifouling resistance of modified TFC membranes is mainly due to the improved surface hydrophilicity coupled with greater surface charge properties. This work demonstrated a rapid solvent-free surface modification method that can be employed to enhance TFC membrane properties for desalination process.
Domaine de référence : Antifouling
Auteur Siew Khoo Ying, Jye Lau Woei, Yeow Liang Yong, Karaman Mustafa, Gürsoy Mehmet, Fauzi Ismail Ahmad
Année de parution : 2020.
Mots-clés : Anti-fouling, Hydrophilic monomers, PECVD, Surface modification, TFC membrane.
Type de document : Article de revue.
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Robust Biomimetic Hierarchical Diamond Architecture with Self-cleaning, Antibacterial and Antibiofouling Surface

Résumé : Biofouling is a worldwide problem from healthcare to the marine exploration. Aggressive biofouling, wear, and corrosion lead to severe deterioration in function and durability. Here, micro and nano-structured hierarchical diamond films, mimicking morphology of plant leaves were developed to simultaneously achieve superhydrophobicity, antibacterial efficacy and marine antibiofouling, combined with mechanical and chemical robustness. These coatings were designed and successfully constructed on various commercial substrates, such as titanium alloys, silicon, and quartz glass via a chemical vapor deposition process. The unique surface structure of diamond films reduced bacteria attachment by 90-99%. In the marine environment, these biomimetic diamond films significantly reduced more than 95% adhesion of green algae. The structured diamond films remained mechanical robustness, superhydrophobicity and antibacterial efficacy under high abrasion and corrosive conditions, exhibiting at least 20 times enhanced wear resistance than the bare commercial substrates even after long-term immersion in seawater.
Domaine de référence : Antifouling
Auteur Wang Tao, Huang Lei, Liu Yuzhi, Li Xingxing, Liu Chunhua, Handschuh-Wang Stephan, Xu Yang, Zhao Ying, Tang Yongbing
Année de parution : 2020.
Type de document : Article de revue.
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Microbial communities of orange tubercles in accelerated low water corrosion

Résumé : The rapid degradation of marine infrastructure at the low tide level due to accelerated low water corrosion (ALWC) is a problem encountered worldwide. Despite this, there is limited understanding of the microbial communities involved in this process. We obtained samples of the orange-coloured tubercles commonly associated with ALWC from two different types of steel sheet piling, located adjacent to each other but with different levels of localised corrosion, at a seaside harbour. The microbial communities from the outer and inner layers of the orange tubercles, and from adjacent seawater, were studied by pure culture isolation and metabarcoding of the 16S rRNA genes. A collection of 119 bacterial isolates was obtained from one orange tubercle sample, using a range of media in anaerobic and aerobic conditions. The metabarcoding results showed that sulfur and iron oxidisers were more abundant on the outer section of the orange tubercles compared to the inner layers, where Deltaproteobacteria (which includes many sulfate reducers) were more abundant. The microbial communities varied significantly between the inner and outer layers of the orange tubercles and also with the seawater, but overall did not differ significantly between the two steel sheet types. Hence we saw similar microbial communities in orange tubercles present, but different levels of localised corrosion, for two different types of co-located steel sheet piling. Metallurgical analysis found differences in composition, grain size, ferrite-pearlite ratio and the extent of inclusions present between the two steel types investigated. IMPORTANCE The presence of orange tubercles on marine steel pilings is often used as an indication that accelerated low water corrosion is taking place. We studied the microbial communities in attached orange tubercles on two closely located sheet pilings that were of different steel types. The attached orange tubercles were visually similar, but the extent of underlying corrosion on the different steel surfaces were substantially different. No clear difference was found between the microbial communities present on the two different types of sheet piling. However, there were clear differences in the microbial communities in the corrosion layers of tubercles, which were also different to the microbes present in adjacent seawater. The overall results suggest that the presence of orange tubercles, a single measurement of water quality, or the detection of certain general types of microbes (e.g. sulfate reducing bacteria) should not be taken alone as definitive indications of accelerated corrosion.
Domaine de référence : Antifouling
Auteur Phan Hoang C., Wade Scott A., Blackall Linda L.
Année de parution : 2020.
Type de document : Article de revue.
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Active deformation of dielectric elastomer for detection of biofouling

Résumé : Biofouling accumulation on synthetic underwater surfaces presents serious economic problem for the marine industry. When a substrate-bonded dielectric elastomer (DE) is subjected to high voltage, deformations in form of creases can be formed at the surface of the DE. This deformation, has been already demonstrated for the prevention and detachment of biofouling from the surface of DEs. In this work, we add sensing capability to the anti-biofouling effect of active DE surfaces. A device consisting of a metallic plate, a Kapton sheet, and a thin silicone membrane is immersed in conductive solution, which acts as one electrode, with the metal plate being the second electrode. Two different conductive solutions were used 3.5 wt% NaCl and 20 wt% NaCl. The surface deformation of the silicone as a function of applied voltage is monitored under microscope in order to verify electrical measurements. Breakdown measurements of the dielectric material in different conductive solutions are also performed. Because the membrane is made from incompressible elastomer and bonded to a rigid substrate, voltages below the creasing threshold create no deformation in the membrane, and therefore no change in capacitance. Above the voltage threshold, creasing instabilities appear at the surface of the silicone, thus increasing the capacitance of the device. Therefore, the capacitance of the sensor is measured as a function of applied voltage, and the voltage at which the capacitance increases is the threshold voltage at which creases occur. Creases are identified when using both 3.5 wt% NaCl and 20 wt% NaCl as top electrode. Theoretical values of creasing voltage deviate from the experimental measurements. Type of conductive solution is shown to have no significant influence on a breakdown voltage.
Domaine de référence : Antifouling
Auteur Krpovic Sara, Dam-Johansen Kim, Skov Anne Ladegaard, Rosset Samuel, Anderson Iain
Année de parution : 2020.
Type de document : Article de colloque.
Source : International Society for Optics and Photonics
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Green Adhesives : Preparation, Properties, and Applications

Résumé : Green Adhesives: Preparation, Properties and Applications deals with the fabrication methods, characterization, and applications of green adhesives. It also includes the collective properties of waterborne, bio, and wound-healing green adhesives. Exclusive attention is devoted to discussing the applications of green adhesives in biomedical coatings, food, and industrial applications.
Domaine de référence : Antifouling
Auteur Inamuddin, Boddula Rajender, Ahamed Mohd Imran, Asiri Abdullah M.
Année de parution : 2020.
Mots-clés : Science / Chemistry / General.
Type de document : Livre.
Source : John Wiley & Sons
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Effective Fabrication and Characterization of Eco-friendly Nano Chitosan Capped Zinc Oxide Nanoparticles for PEfficient Marine Fouling Inhibition

Résumé : Since the inhibition of organotin as antifouling additives in 2003, many scientists direct their efforts to develop novel environment-friendly marine antifouling additives. This work declares and evaluates the antifouling activity of Nano chitosan capped ZnO nanoparticles against primary biofilm and biofouling. Chitosan nanoparticles were prepared from the shrimp shell obtained, which will be environmentally friendly and will have no adverse effects on the environment's antialgal, antimicrobial and antifungal characteristics. Using co-precipitation method, the present study manages synthesis and characterization of Nano chitosan capped ZnO nanoparticles (NCCZO NPs) and was identified by FTIR, XRD, HRTEM, SEM, EDX, and UV-VIS. NCCZO NPs have been mixed in the prepared formula of inert marine paint. The formulated paints were then brushed twice on PVC panels, hung in a steel frame and immersed in the Mediterranean Sea Eastern Harbor of Alexandria, followed by visual examination and photographic recordings. The findings revealed once 64 days of immersion that (NCCZO NPs) are resistant to tubeworms and barnacles formation due to their functional groups. This inhibition activity was linked to the significant functional groups (hydroxyl and amine) of the NCCZO NPs. The strong antifouling activity makes them promising candidates for new antifouling additives.
Domaine de référence : Antifouling
Auteur El-saied Hend Al-aidy, Ibrahim Ahmed Mohammed
Année de parution : 2020.
Mots-clés : Antifouling, Biofouling, Chitosan, Marine paint, Zinc oxide nanoparticles.
Type de document : Article de revue.
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A novel indicator for ship hull and propeller performance : Examples from two shipping segments

Résumé : Ship hulls and propellers suffer from both mechanical defects and marine growth, which increase surface roughness and thus lead to significant power/speed penalties. A recent standard, ISO 19030:2016, aimed at establishing a transparent and accurate method to compare a vessel's performance to itself over time. However, the standard performance value, percentage speed difference Vdiff, is both vessel-specific and sensitive to operation point, most importantly vessel speed. The current paper thus proposes a new performance indicator, based on the concept of equivalent sand-grain roughness height ks, which would enable comparisons between vessels, increased accuracy for comparison of a vessel to itself over time, and calculation of penalties under operating conditions differing from past data (e.g. slow steaming). Sand-grain height ks is determined iteratively, through modelling roughness penalties on propulsive power (Granville's similarity law scaling), comparing modelled and measured penalties, and stopping the iterative process at a given tolerance on power penalty. This new performance indicator is applied to onboard-collected data from a Panamax tanker and two Roll-on/Roll-off sister vessels, yielding qualitative agreement with hull condition reported from diving inspections. Comparative advantages and limitations of ks are discussed in relation to the ISO 19030 performance value.
Domaine de référence : Antifouling
Auteur Oliveira Dinis Reis, Granhag Lena, Larsson Lars
Année de parution : 2020.
Mots-clés : Energy efficiency, Fouling-control coatings, Hull biofouling, Hull roughness, In-water hull cleaning, ISO 19030.
Type de document : Article de revue.
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Polymers Coatings : Technology and Applications

Résumé : The explores the cutting-edge technology of polymer coatings. It discusses fundamentals, fabrication strategies, characterization techniques, and allied applications in fields such as corrosion, food, pharmaceutical, biomedical systems and electronics. It also discusses a few new innovative self-healing, antimicrobial and superhydrophobic polymer coatings. Current industrial applications and possible potential activities are also discussed.
Domaine de référence : Antifouling
Auteur Inamuddin, Boddula Rajender, Ahamed Mohd Imran, Asiri Abdullah M.
Année de parution : 2020.
Mots-clés : Science / Chemistry / General, Technology & Engineering / Materials Science / Thin Films, Surfaces & Interfaces.
Type de document : Livre.
Source : John Wiley & Sons
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Bacterial response mechanism during biofilm growth on different metal material substrates : EPS characteristics, oxidative stress and molecular regulatory network analysis

Résumé : Overwhelming growth of bacterial biofilms on different metal-based pipeline materials are intractable and pose a serious threat to public health when tap water flows though these pipelines. Indeed, the underlying mechanism of biofilm growth on the surface of different pipeline materials deserves detailed exploration to provide subsequent implementation strategies for biofilm control. Thus, in this study, how bacteria response to their encounters was explored, when they inhabit different metal-based pipeline substrates. Results revealed that bacteria proliferated when they grew on stainless steel (SS) and titanium sheet (Ti), quickly developing into bacterial biofilms. In contrast, the abundance of bacteria on copper (Cu) and nickel foam (Ni) substates decreased sharply by 4–5 logs within 24 h. The morphological shrinkage and shortening of bacterial cells, as well as a sudden 64-fold increase of carbohydrate content in extracellular polymeric substances (EPS), were observed on Cu substrate. Furthermore, generation of reactive oxygen species and fluctuation of enzymatic activity demonstrated the destruction of redox equilibrium in bacteria. Bacteria cultured on Cu substrate showed the strongest response, followed by Ni, SS and Ti. The oxidative stress increased quickly during the growth of bacterial biofilm, and almost all tested metal transporter-related genes were upregulated by 2–11 folds on Cu, which were higher than on other substrates (1–2 folds for SS and Ti, 2–9 folds for Ni). Finally, these behaviors were compared under the biofilm regulatory molecular network. This work may facilitate better understanding different response mechanisms during bacterial biofilm colonization on metal-based pipelines and provide implications for subsequent biofilm control.
Domaine de référence : Biocorrosion , Antifouling
Auteur Wang Jiaping, Li Guiying, Yin Hongliang, An Taicheng
Année de parution : 2020.
Mots-clés : Bacterial biofilm, EPS, Growth profiles, Metal-based pipeline materials, Oxidative stress.
Type de document : Article de revue.
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Role of bacterial biofilms and their EPS on settlement of barnacle (Amphibalanus reticulatus) larvae

Résumé : Settlement of pelagic cypris larvae is crucial for barnacle biofouling which causes severe operational problems and economic penalties in maritime activities and seawater cooled power plants. Marine biofilms formed on submerged surfaces play a key role in settlement of larvae of barnacles and a promising source for environmentally benign antifouling strategies. To determine inhibitory action of biofilms, bacterial strains were isolated from natural biofilms, screened for their biofilm formation potential and interference in settlement of cyrpis larvae of Amphibalanus reticulatus. Monoculture biofilms of three bacterial strains i.e. Alteromonas sp. 1, Alteromonas sp. 2 and Bacillus cereus inhibited cypris settlement by ~67%–93% and 67%–78% in choice and no choice experiments, respectively. Biofilms of two bacterial strains (B. pumilus and Halomonas aquamarina) had no significant effect and one strain (Brevibacterium casei) showed marginal induction in cypris settlement. In case of inhibitory biofilms, the inhibitory action on cypris could be ascertained to the loosely bound extracellular polymeric substances (LB EPS). The effects of LB EPS included settlement inhibition, larval mortality, altered larval behaviour and interrupted moulting. Crude fractionation and testing of individual LB EPS fractions showed that the inhibitory activity was associated with the carbohydrate components. This study shows the importance of further studies on probing marine biofilm-larval interactions, identification and characterization of inhibitory compounds for developing newer environmentally benign antifouling strategies.
Domaine de référence : Antifouling
Auteur Rajitha K., Nancharaiah Y. V., Venugopalan V. P.
Année de parution : 2020.
Mots-clés : Antifouling, Barnacle fouling, Biofouling control, Marine biofilms, Settlement inhibition.
Type de document : Article de revue.
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Combining a bio-based polymer and a natural antifoulant into an eco-friendly antifouling coating

Résumé : Biodegradable polymers are promising binders and carriers for natural antifoulants. In the present study, an antifouling (AF) coating was developed by adding a non-toxic AF compound (butenolide) to a bio-based and biodegradable poly(lactic acid)-based polyurethane. Mass loss measurement showed that the polymer degraded in seawater at a rate of 0.013 mg cm−2 day−1. Measurements showed that butenolide was released from the coatings into seawater over a period of at least three months. Both the concentration of butenolide in the coatings and the ambient temperature determined the release rate of butenolide. The results further demonstrate that incorporating rosin into the coatings increase the self-renewal rate of the polymer and facilitated the long-term release of butenolide from the coating. The results show that poly(lactic acid)-based polyurethane is a suitable polymer for butenolide-based AF coatings.
Domaine de référence : Antifouling
Auteur Chiang Ho Yin, Pan Jiansen, Ma Chunfeng, Qian Pei-Yuan
Année de parution : 2020.
Mots-clés : biodegradable polymer, butenolide, Eco-friendly antifouling coating, release rate.
Type de document : Article de revue.
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A Bioinspired Hierarchical Underwater Superoleophobic Surface with Reversible pH Response

Résumé : The development of oil-repellent surfaces in liquid environments has received considerable attention because of the urgent demand for antifouling coatings in marine industry. Inspired by the unique nanostructure surface of filefish scale, hierarchical films that consist of poly(pentafluorophenyl acrylate) free standing micropillars grafted with pH responsive poly(methacrylic acid) nanobrushes are fabricated by anodic aluminum oxide templating method combined with a subsequent post-polymerization modification strategy. The obtained films exhibit constantly underwater superoleophobicity, furthermore, a pH sensitive functionality, which enables reversible switching between low and high oil adhesion as a result of the adjustable oil sliding angle. This particular study provides a very mild method for the facile fabrication of bioinspired nanostructures with excellent oil-repellent performance and switchable oil-adhesion properties, thus paving the way toward novel functional materials with smart structures for promising applications, such as smart microfluidics, controllable bioadhesion, and intelligent materials for oil removal treatment and marine antifouling.
Domaine de référence : Antifouling
Auteur Huang Xia, Mutlu Hatice, Theato Patrick
Année de parution : 0.
Mots-clés : anodic aluminum oxide, pH response, post-polymerization modification, superoleophobic surfaces.
Type de document : Article de revue.
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Sub lethal effect of antifouling paints on marine organism

Résumé : Antifouling paints containing tributyltin (TBT) began in the late 1980s. Although it still may be available in some parts of the world, antifouling paints containing TBT were ultimately banned in 2008. Copper began to become a concern in California in the 1990s. Copper has been used in antifouling paints for centuries because it is effective, available, and relatively inexpensive compared to other biocides. However, excessive concentrations of copper in aquatic ecosystems can exert detrimental effect on marine life such as fish.
Domaine de référence : Antifouling
Auteur Ghais Saif Al, Bhardwaj Vibha, Kumbhar Pramod
Année de parution : 0.
Type de document : Article de revue.
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Past and future of the marine bioinvasions along the Southwestern Atlantic

Résumé : The first comprehensive survey of marine bioinvasions in the southern Southwest Atlantic Ocean (SWA, ca. 33°45′–ca. 54°50′S) published in 2002 reported 31 introduced and 46 cryptogenic species. In this assessment, we update this work by providing a deep historical perspective of marine biological invasions as well as a full new review of introductions that have occurred over the past nearly two decades. We reviewed a variety of sources including peer-reviewed journals and monographs, government reports, and museum databases, among others. The previous survey was re-evaluated and taxonomic experts were also consulted. For each species, the possible status as introduced or cryptogenic, likely vector, likely native region, first collection date if known, and the first authoritative reference of its SWA occurrence were determined. Species were categorized by biogeographical provinces. Our reevaluation of species status lowered the 2002 survey to 29 introduced and 29 cryptogenic species. The result of our analyses added 100 new introduced and 43 new cryptogenic species, making a total of 129 introduced and 72 cryptogenic marine species for the SWA. Of these 100 species, 67 were found in the literature older than the 2002 survey, and 33 were found as new invasions that occurred since 2002, averaging one new invasion every 178 days. Ships are the most likely vector of invasions with an additional few species introduced with aquaculture, for ornamental purposes or for stabilizing coastal dunes. Most species are native to either the North Pacific or North Atlantic Oceans. Most introduced species (51%) occur in the warm temperate SWA marine ecoregion, while fewer (16%) occur in the cold temperate Magellanic marine ecoregion. Since ships are the main vectors in the region, we forecast that new introductions will continue until regional and international regulations to control ballast water and hull fouling begin to be effective. Our results urge the creation of long-term assessment programs focused on marine coastal biodiversity as a way to avoid inefficient environmental management based on deficient baseline information.
Domaine de référence : Antifouling
Auteur Schwindt Evangelina, Carlton James, Orensanz José, Scarabino Fabrizio, Bortolus Alejandro
Année de parution : 2020.
Type de document : Article de revue.
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Cleaning by beaching : introducing a new alternative for hull biofouling management in Argentina

Résumé : Recreational vessels favor the secondary spread of exotic marine species hosted on hull biofouling communities through coastal trips. Hull biofouling is also a problem for vessel owners because it reduces the efficiency and maneuverability of the vessel. This study documents a pioneer case of alternative hull biofouling management in a context where local regulations prohibit in-water cleaning operations and where there are no shore-based facilities. We designed and put into practice a method to manually clean a 35 meter long catamaran, by beaching it in a macrotidal beach of Patagonia, Argentina. During the cleaning, all hull biofouling was removed and collected to prevent organisms from falling on the beach. A total of 12.5 m3 of biofouling was deposited in landfill following regulations for fishing discard material. In addition, qualitative and quantitative fouling samples were obtained from different hull locations of the vessel, including niche areas. A total of 53 distinct taxa were identified, including 18 exotic species for Argentina, 7 of which had not been previously reported for the study area. Cleaning by beaching can be used as a convenient biosecurity method to remove hull biofouling from small and medium size vessels when other methods or facilities on the coast are not available. Our results also provide further evidence for the potential risk of recreational vessels as vectors for the secondary spread of marine exotic species.
Domaine de référence : Antifouling
Auteur Castro Karen, Giachetti Clara, Battini Nicolás, Bortolus Alejandro, Schwindt Evangelina
Année de parution : 2020.
Type de document : Article de revue.
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Insight into bacterial biofilm-barnacle larvae interactions for environmentally benign antifouling strategies

Résumé : Colonization of submerged surfaces by marine organisms such as microorganisms and barnacles entails significant operational and economic problems in shipping, aquaculture, power plant cooling water systems and various other activities. Microorganisms rapidly colonize the surfaces that are submerged in seawater and form complex heterogeneous 3-dimensional structures called biofilms. These marine biofilms can interfere in the subsequent settlement of larvae of fouling organisms and biofouling process. Barnacles are the most notorious biofouling organisms for colonizing underwater structures and plaguing maritime installations. This article covers recent advances on marine biofilms, chemical signalling systems, biofilm-barnacle larval interactions, antifouling technologies and future studies for developing prospective eco-friendly antifouling strategies. Accumulating evidence indicates that marine biofilms and their chemical constituents interfere in larval recruitment for settlement or repell, thereby either promoting or deterring barnacle biofouling. Though several studies reported inhibition of barnacle larval settlement in the presence of biofilms and their exudates, characterization and identification of the chemical cues are fundamental for developing new eco-friendly antifouling strategies. Future research should be focused on better understanding of the chemistry of biofilm-associated cues that inhibit settlement of barnacle larvae as the first step and further in situ testing shall be conducted in the relevant conditions for performance evaluation to guide field applications. The knowledge accrued from biofilm-barnacle larval interactions and identification of chemical cues could possibly offer advances for prospective environmentally-benign antifouling strategies.
Domaine de référence : Antifouling
Auteur Rajitha K., Nancharaiah Y. V., Venugopalan V. P.
Année de parution : 2020.
Mots-clés : Antibiofilm, Antifouling, Barnacle settlement, Biofilms, Biofouling, Natural antifouling compounds.
Type de document : Article de revue.
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BIOFOULING-ET-ANTIFOULING-BIOLOGIQUE.pdf

Domaine de référence : Antifouling
Année de parution : 0.
Type de document : Pièce jointe.
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Seasonal variability in trophic-functional patterns of marine biofilm-dwelling ciliates during the process of colonization

Résumé : In order to evaluate the seasonal shifts of colonization dynamics in trophic-functional groups of biofilm-dwelling ciliates, a one-year baseline survey was carried out in Chinese coastal waters of the Yellow Sea. Utilizing glass microscope slides as artificial substrates, a total of 240 slides were used to collect ciliates after immersion times of 3, 7, 10, 14, 21 and 28 days during each of four seasons, i.e., February, May, August and November, 2017 representing winter, spring, summer, and autumn, respectively. Four trophic-functional groups (TFgrs) were recorded from a 122 species-dataset, i.e., algivores (A), non-selectives (N), raptors (R) and bacterivores (B), comprising of 65, 31, 12 and 14 species, respectively. Based on these four TFgrs, the colonization dynamics of biofilm-dwelling ciliates exhibited different seasonal patterns in terms of both frequency of occurrence and probability density during the study period. During colonization processes, TFgrs A, N and B occurred frequently and generally dominated the samples following an increase in abundance of their members from spring to autumn, whereas TFgr R generally showed different colonization dynamics during the four seasons. Distance-based redundancy analysis (dbRDA) demonstrated that the colonization dynamics of the trophic-functional groups followed different models in each of the four seasons. Multidimensional scaling ordinations (MDS) based on bootstrapped-average analyses revealed a clear shift in dominance of trophic-functional groups from spring to winter. Thus, the colonization feature of biofilm-dwelling protozoa as measured by trophic-functional structure differed seasonally, suggesting that an optimal sampling strategy needs to be developed when using ciliates as bioindicators on marine water quality.
Domaine de référence : Antifouling
Auteur Sikder Mohammad Nurul Azim, Xu Henglong, Xu Guangjian, Warren Alan
Année de parution : 2020.
Mots-clés : Colonization surveys, Marine bioassessment, Periphytic ciliates, Seasonal variation, Trophic-functional groups.
Type de document : Article de revue.
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Monitoring Artificial Materials and Microbes in Marine Ecosystems : Interactions and Assessment Methods

Résumé : Marine ecosystems offer several benefits to human communities. To make sustainable use of these benefits, it is necessary to elucidate and conserve marine ecology, and strive to maintain a sustainable natural resource management program. For this reason, understanding the diversity and behavior of both macro-ecosystems and micro-ecosystems are crucial. Monitoring Artificial Materials and Microbes in Marine Ecosystems explores microbial roles and their interaction with artificial materials in marine environments. After starting with simple topics for beginners, chapters explore methods to detect microorganisms in marine ecosystems and interactions of marine organisms with artificial materials. The sequential progression into advanced topics makes it easier to understand how to solve the reduction in marine-ecosystem viability caused by adverse events. Readers are provided with useful information for rehabilitating marine environments to make them sustainable for communities. Topics are covered in 3 parts: Part 1 is an introductory guide to marine ecosystems and environmental monitoring assessment. Readers are introduced to coral reef ecosystems, algal blooms and the role of environmental monitoring services in maintaining and restoring the quality of marine environments. This is followed by examples of sustainable marine environment assessment.Part 2 provides information about methods to detect microorganisms (viruses and bacteria) and evaluate marine environments. This includes sample enrichment methods, electrochemical analysis, and single cell imaging techniques. The highly sensitive and specific techniques presented in the book, are applicable in a wide variety of situations.Part 3 is dedicated to interactions between artificial metallic materials and microorganisms in marine environments. Chapters in this section share results from several experiments conducted to separate microorganisms and biofilms from such environments. This book is intended primarily for marine ecologists, microbiologists, environmental engineers, and engineers associated with industrial projects. This book is also useful as a text for undergraduate and graduate level courses in marine biology, ecology, and microbiology.
Domaine de référence : Antifouling
Auteur Takahashi Toshiyuki
Année de parution : 2020.
Mots-clés : Science / Life Sciences / Marine Biology.
Type de document : Livre.
Source : Bentham Science Publishers
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An overview of controlled-biocide-release coating based on polymer resin for marine antifouling applications

Résumé : Biofouling is one of the major worldwide problems associated with the vessel due to its accumulation with the surface of the ship hull. The biofouling is the main origin of the coating’s deterioration that ultimately leads to bio-corrosion, roughness and drag, resulting in an enormous increase in the fuel consumption. Although Tributyltin (TBT) has been used as a pioneer class of antifoulant to overcome this problem, however, after the legal restriction on TBT, some biocides have been used as its alternatives. These biocides are potentially harmful to the environment due to the higher release rate in the aquatic environment. This review paper focuses on the progress made in eco-friendly antifouling coating techniques, using control biocide release principal for marine application. The three main strategies, hydrophilic, hydrophobic, and biodegradable antifouling coating, are reviewed. Biodegradable antifouling coating is a new promising route based on the combination of eco-friendly biocide with dynamic surfaces by utilizing degradable polyurethane, polyester acrylate, and modified polyester based polymers. They are used as a carrier of antifoulant, which control the release rate and also show excellent antifouling activity in the marine coatings due to tunability, sustainability, and mechanical performance, therefore, they have a longer shelf period. Moreover, this review focuses on the challenges associated with vessel surface coating and their possible solutions.
Domaine de référence : Antifouling
Auteur Ali Abid, Jamil Muhammad Imran, Jiang Jingxian, Shoaib Muhammad, Amin Bilal Ul, Luo Shengzhe, Zhan Xiaoli, Chen Fengqiu, Zhang Qinghua
Année de parution : 2020.
Type de document : Article de revue.
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Chapter 5 - Identifying Microbiota : Genomic, Mass-Spectrometric, and Serodiagnostic Approaches

Résumé : The study of microbes is over 200 years old and is continually enriched with new methods and techniques as older ones, such as microscopy and cultures keep evolving and improving. Recently, the addition of novel methods enabled the paradigm shift from microbiology to microbiomics, although successive cycles of spiral development may be needed to properly fulfill their new assignment. Microbiomics insist on an all-encompassing, augmented view of the sum of microbial populations and their interactions among themselves and their environment, thus promoting a far more complex and detailed picture where ecological and communal dynamics and relations are just as important as cellular, genetic, and taxonomic particulars. The projected massive differentiation and increased presence of microbiota in every sector of human life may necessitate the application of combinations of methodologies in order to tackle issues of discovery, detection, tracking, and categorization, as operational optima of the five basic methodologies (microscopy, spectroscopy, cultures, serodiagnostics, and molecular diagnostics) are different although somewhat overlapping.
Domaine de référence : Antifouling
Auteur Velegraki Aristea, Zerva Loukia, Kambouris Manousos E., Velegraki Aristea
Année de parution : 2020.
Mots-clés : ELISA, genomics, immunoassays, MALDI-TOF, mass spectroscopy, Microscopy, nucleic acid amplification tests, nucleic acid assays, serodiagnostics.
Type de document : Chapitre de livre.
Source : Academic Press
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Properties of Iron Bacteria Biofouling on Ni-P-rGO Coating under Flowing Conditions

Résumé : Biofouling on heat exchange devices can decrease heat transfer efficiency, corrode materials, and even lead safety accidents. Most heat exchange devices are made of carbon steel, which produces biofouling easily. In this paper, nickel-phosphorus-reduced graphene oxide (Ni-P-rGO) coating was prepared on carbon steel by electroless plating as a kind of advanced material to study the properties of iron bacteria biofouling under flowing conditions. The coating was analyzed via scanning electron microscopy and Raman spectroscopy. The properties of iron bacteria biofouling on carbon steel and Ni-P-rGO coating were then compared under flowing conditions. Compared with carbon steel, the asymptotic value of fouling resistance on the Ni-P-rGO coating significantly decreased. Additionally, the induction period and the time of reaching the asymptotic value greatly increased. The inhibition properties of biofouling of advanced materials Ni-P-rGO coating under different temperatures, flow velocities, and initial concentrations was also studied.
Domaine de référence : Antifouling
Auteur Sun Mingyang, Xu Zhiming, Liu Zuodong, Wang Bingbing, Di Huishuang
Année de parution : 2020.
Mots-clés : biofouling, fouling resistance., induction period, iron bacteria, nickel-phosphorus-reduced graphene oxide (Ni-P-rGO).
Type de document : Article de revue.
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Domaine de référence : Antifouling
Année de parution : 0.
Type de document : Pièce jointe.
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Ocean acidification affects microbial community and invertebrate settlement on biofilms

Résumé : Increased atmospheric CO2 is driving ocean acidification (OA), and potential changes in marine ecosystems. Research shows that both planktonic and benthic communities are affected, but how these changes are linked remains unresolved. Here we show experimentally that decreasing seawater pH (from pH 8.1 to 7.8 and 7.4) leads to reduced biofilm formation and lower primary producer biomass within biofilms. These changes occurred concurrently with a re-arrangement of the biofilm microbial communities. Changes suggest a potential shift from autotrophic to heterotrophic dominated biofilms in response to reduced pH. In a complimentary experiment, biofilms reared under reduced pH resulted in altered larval settlement for a model species (Galeolaria hystrix). These findings show that there is a potential cascade of impacts arising from OA effects on biofilms that may drive important community shifts through altered settlement patterns of benthic species.
Domaine de référence : Antifouling
Auteur Nelson Katie S., Baltar Federico, Lamare Miles D., Morales Sergio E.
Année de parution : 2020.
Type de document : Article de revue.
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Ce projet est financé par le Fonds Européen de Développement Régional, la Région Normandie et le Conseil Départemental de la Manche.