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首页> 外文期刊>Biotechnology Progress >Containment of Biogenic Sulfide Production in Continuous Up-Flow Packed-Bed Bioreactors with Nitrate or Nitrite
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Containment of Biogenic Sulfide Production in Continuous Up-Flow Packed-Bed Bioreactors with Nitrate or Nitrite

机译：含硝酸盐或亚硝酸盐的连续向上填充床生物反应器中生物硫化物生产的抑制

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Produced water from the Coleville oil field in Saskatchewan,Canada was used to inoculate continuous up-flow packed-bad bioreactors.When 7.8 mM sulfate and 25 mM lactate were present in the in-flowing medium,H_2S producton(souring)by sulfate-reducing bacteria (SRB) was prevented by addition of 17.5 mM nitrate or 20 mM nitrite Changing the sulfate or lactgate doncentration of the in-flowing medium indicated that the concentrations of nitrate or nitrite required for containment of souring decreaxsed proportionally with a lowered concentration of the electon donor lactate while the sulfate concentration of the medium had no effet.Microbial communities were dominated by SRB.Nitrate addition did not give rise to changes in community cfomposition,indicating that lactate xoidation and H_2S removal were caused by the combined action of SRB and nitrate-reducing sulfide-oxidizing bacteria (NR-SOB).Apparently the nitrite concentrations formed by these NR-SOB did not inhibit the SRB sufficiently to cause community shifts.In contrast significant community shifts were observed upon direct addition of high concentrations(20 mM) of nitrite.Strains NO3A and NO2B two newly isolated nitrate-reducing bactgeria (NRB) emerged as major community members.These were foudn to belong to the epsilon-division of the Proteobacteria to be most closely related to DCampylobacter lari and to oxidize lactate with nitrate or nitrite as the electron acceptor.Thus the mechanism of microbiah H_2S removal in up-flow packed-bed bioreactors depended on wheter nitrate 9SRB/NR-SOB) or nitrite (SRB/NR-SOB as well as NRB) was used.However,the amount of nitrate or nitrite meeded to comjpletely remove H_2S was dictated by the electron donor (lactate) concetration,irrespecitive of mechanism.
机译：来自加拿大萨斯喀彻温省科尔维尔油田的采出水用于接种连续不断向上流动的填充不良生物反应器。当流入的培养基中存在7.8 mM硫酸盐和25 mM乳酸时，通过硫酸盐还原产生（酸化）H_2S产物通过添加17.5 mM硝酸盐或20 mM亚硝酸盐可防止细菌（SRB）的变化改变流入介质的硫酸盐或乳酸门浓度，表明抑制发酸所需的硝酸盐或亚硝酸盐浓度与电子浓度的降低成比例地降低供体乳酸，而培养基中的硫酸盐浓度没有影响。微生物群落受SRB的影响。硝酸盐的添加不会引起群落构成的变化，表明乳酸Xoidation和H_2S的去除是SRB和硝酸盐的联合作用引起的。显然，由这些NR-SOB形成的亚硝酸盐浓度不能充分抑制SRB，从而减少了硫化物氧化细菌（NR-SOB）的产生。相反，直接添加高浓度（20 mM）的亚硝酸盐时会观察到显着的群落转移。菌株NO3A和NO2B出现了两个新近分离出的硝酸盐还原菌（NRB），它们是主要的群落成员，它们属于变形杆菌的epsilon分区与DCampylobacter lari密切相关，并以硝酸盐或亚硝酸盐为电子受体氧化乳酸-SOB）或亚硝酸盐（SRB / NR-SOB以及NRB）。但是，完全除去H_2S所需的硝酸盐或亚硝酸盐的量取决于电子给体（乳酸）的浓度，其机理无关紧要。

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