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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