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Corrosion by sulfate reducing bacteria that utilize nitrate

Dunsmore, B., Whitfield, T., Lawson, P.A. and Collins, M.D. (2004) Corrosion by sulfate reducing bacteria that utilize nitrate. Corrosion, 60. pp. 1-10. ISSN 0010-9312

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16S rRNA gene sequencing was used to identify a sulfate-reducing bacterium (SRB) from a Danish North Sea oilfield water injection system. This species was cultivated, purified and subsequently identified as being >97% similar to Desulfovibrio gracilis. Like some other Desulfovibrio species this SRB, strain OP102, could reduce nitrate as an electron acceptor and produce ammonia in the absence of sulfate. In addition, in the presence of sulfate, when nitrate was dosed at 100 mg/l it was again reduced by the bacterium, with some ammonium production. Therefore, this mechanism could be important in oilfield systems where nitrate is applied to prevent sulfide generation by SRB which leads to reservoir souring. In static tests the influence of this Desulfovibrio on corrosion was assessed using carbon steel coupons, in the presence of sulfate and in the presence of sulfate with 100 mg/l nitrate. Corrosion rates were less than 1.5 mpy when coupons were incubated in the same water, with sulfate and with nitrate. Furthermore, the occurrence of pitting corrosion was fairly low under all circumstances.

Item Type:Article
Divisions:Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences
ID Code:13453
Uncontrolled Keywords:MIC (microbiologically influenced corrosion), SRB (sulfate-reducing bacteria), Nitrate injection, Reservoir Souring, H2S production, NUB (nitrate-utilizing bacteria)

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