Authors: Y Li P Zhang W Cai J S Rosenblatt I I Raad D Xu T Gu
Publish Date: 2016/01/08
Volume: 32, Issue: 2, Pages: 23-
Abstract
Microbiologically influenced corrosion MIC also known as biocorrosion is caused by corrosive biofilms MIC is a growing problem especially in the oil and gas industry Among various corrosive microbes sulfate reducing bacteria SRB are often the leading culprit Biofilm mitigation is the key to MIC mitigation Biocide applications against biofilms promote resistance over time Thus it is imperative to develop new biodegradable and costeffective biocides for largescale field applications Using the corrosive Desulfovibrio vulgaris an SRB biofilm as a model biofilm this work demonstrated that a cocktail of glyceryl trinitrate GTN and caprylic acid CA was very effective for biofilm prevention and mitigation of established biofilms on C1018 carbon steel coupons The most probable number sessile cell count data and confocal laser scanning microscope biofilm images proved that the biocide cocktail of 25 ppm w/w GTN + 01 w/w CA successfully prevented the D vulgaris biofilm establishment on C1018 carbon steel coupons while 100 ppm GTN + 01 CA effectively mitigated preestablished D vulgaris biofilms on C1018 carbon steel coupons In both cases the cocktails were able to reduce the sessile cell count from 106 cells/cm2 to an undetectable level
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