A Novel Method for the Enhanced Kill of Sulfate Reducing Microorganisms

ABSTRACT Hydrogen sulfide gas produced by sulfate reducing microorganisms (SRM) creates significant challenges in the petroleum industry including corrosion concerns, product devaluation, and significant health risks. Challenges associated with SRM activity include H2S production that can result in...

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Bibliographic Details
Published inNACE International Corrosion Conference Proceedings pp. 1 - 13
Main Author Jenneman, Gary E
Format Conference Proceeding
LanguageEnglish
Published Houston NACE International 01.07.2020
Subjects
Anthraquinones
Biocides
Chemicals
Corrosion inhibitors
Corrosion products
Enzymes
Health risk assessment
Hydrogen sulfide
Microorganisms
Reductases
Sulfate reduction
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Summary:ABSTRACT Hydrogen sulfide gas produced by sulfate reducing microorganisms (SRM) creates significant challenges in the petroleum industry including corrosion concerns, product devaluation, and significant health risks. Challenges associated with SRM activity include H2S production that can result in devaluation of marketable products; increased health risks; and corrosion of metallic materials used in the transportation of water, oil and gas. SRM inhibitors include a large variety of chemical types including nitrate, nitrite, perchlorate, anthraquinone,2 and molybdate.3 However, inhibitors do not result in kill of SRM such that a rapid return of activity, as well as, potential resistance mechanisms are possible risks not always associated with biocides.4 To increase the activity of the SRM inhibitor, anthraquinone, Burger5 found that biocide treatment followed by anthraquinone application could extend the control of SRM activity vs. anthraquinone alone. The inhibitor, nitrite, is known to be a potent competitive inhibitor of the sulfite reductase enzyme found in all known SRM.7 However, many SRM will produce a periplasmic nitrite reductase enzyme when exposed to nitrite that can eliminate the inhibitory effects of nitrite by converting it to ammonium.8 Therefore, a strategy using an SRM inhibitor in combination with a biocide to enhance the kill of SRM could eliminate the rapid return of SRM activity and potentially circumvent inhibitor resistance mechanisms.