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Evaluation of Sessile Microorganisms in Pipelines and Cooling Towers of Some Iranian Industries

机译:伊朗一些行业的管道和冷却塔中无微生物的评估

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摘要

Microbiologically influenced corrosion (MIC) is a kind of electrochemical corrosion that is enhanced by the effect of certain microorganisms including sessile bacteria. In this investigation, more than 200 samples collected from different systems of Iranian refineries have been examined (by catering methods and observations) for corrosion-enhancing, biofilm-producing microorganisms such as sulfate-reducing bacteria (SRB), iron-oxidizing bacteria (IOB), heterotrophic biofilm-forming bacteria (HBB), and some eu-karyotes such as fungi. This study showed the presence of microorganisms, such as SRB, HBB, thermo-phillic HBB, and yeasts, except for IOB. It was also revealed that biocides are used to reduce the number of planktonic (floating) bacteria, instead of the number of sessile bacteria, that form biofilms. Using surfactants, or washing with chemicals like chlorine or organic acids in overhauls, may destroy the biofilm and free the residential bacteria into the bulk solution, thus exposing them to the biocide. For thick biofilms, a chlorine or acid wash may also yield the same results.
机译:微生物影响的腐蚀(MIC)是一种电化学腐蚀,由于某些微生物(包括无柄细菌)的作用而增强。在这项调查中,检查了200种从伊朗炼油厂的不同系统中收集的样品(通过饮食方法和观察),这些样品用于增强腐蚀的生物膜产生微生物,例如硫酸盐还原细菌(SRB),铁氧化细菌(IOB) ),异养生物膜形成细菌(HBB)和一些真核生物,例如真菌。这项研究表明,除IOB外,还存在微生物,例如SRB,HBB,嗜热HBB和酵母。还揭示了杀生物剂用于减少形成生物膜的浮游(漂浮)细菌的数量,而不是无柄细菌的数量。使用表面活性剂,或在大修中用氯或有机酸之类的化学物质洗涤,可能会破坏生物膜并使居民细菌释放到整体溶液中,从而使它们暴露于杀菌剂中。对于厚厚的生物膜,用氯或酸洗涤也可能产生相同的结果。

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