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journalArticle
El-Bassi
Leila
Ziadi
Islem
Belgacem
Sabrine
Bousselmi
Latifa
Akrout
Hanene
Biocorrosion
Biofilm
Carbon steel
Electrochemical impedance spectroscopy
Microbial cell surface
Investigations on biofilm forming bacteria involved in biocorrosion of carbon steel immerged in real wastewaters
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.
104960
May 1, 2020
en
http://www.sciencedirect.com/science/article/pii/S0964830520301074
2020-04-16 12:14:35
ScienceDirect
International Biodeterioration & Biodegradation
150
International Biodeterioration & Biodegradation
DOI 10.1016/j.ibiod.2020.104960
ISSN 0964-8305