Planktonic nitrate-reducing bacteria and sulfate-reducing bacteria in some western Canadian oil field waters |
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Authors: | Eckford R E Fedorak P M |
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Institution: | (1) Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2E9 , |
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Abstract: | Oil fields that use water flooding to enhance oil recovery may become sour because of the production of H2S from the reduction of sulfate by sulfate-reducing bacteria (SRB). The addition of nitrate to produced waters can stimulate
the activities of nitrate-reducing bacteria (NRB) and control sulfide production. Many previous studies have focused on chemolithotrophic
bacteria that can use thiosulfate or sulfide as energy sources while reducing nitrate. Little attention has been given to
heterotrophic NRB in oil field waters. Three different media were used in this study to enumerate various types of planktonic
NRB present in waters from five oil fields in western Canada. The numbers of planktonic SRB and bacteria capable of growth
under aerobic conditions were also determined. In general, microbial numbers in the produced waters were very low (<10 ml−1) in samples taken near or at wellheads. However, the numbers increased in the aboveground facilities. No thiosulfate-oxidizing
NRB were detected in the oil field waters, but other types of NRB were detected in 16 of 18 produced water samples. The numbers
of heterotrophic NRB were equal to or greater than the number of sulfide-oxidizing, chemolithotrophic NRB in 12 of 15 samples.
These results showed that each of the oil fields contained NRB, which might be stimulated by nitrate amendment to control
H2S production by SRB. Journal of Industrial Microbiology & Biotechnology (2002) 29, 83–92 doi:10.1038/sj.jim.7000274
Received 20 February 2002/ Accepted in revised form 14 May 2002 |
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Keywords: | : heterotroph nitrate nitrate-reducing bacteria petroleum sulfate sulfate-reducing bacteria sulfide |
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