DENITRIFICATION INHIBITING SULFATE REDUCTION PROCESS: ROLES OF S/N RATIO, CARBON SOURCE AND ALKALINITY

文献类型： 外文期刊

第一作者： Zhang, Zhaohan

作者： Zhang, Zhaohan;Gao, Peng;Ren, Nanqi;Feng, Yujie;Liu, Guangmin;Zhang, Zhaohan;Zhan, Peirong

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关键词： Denitrification inhibition;Sulfate reduction;S/N ratio;Carbon source;Alkalinity

期刊名称：FRESENIUS ENVIRONMENTAL BULLETIN （ 影响因子：0.489； 五年影响因子：0.479 ）

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收录情况： SCI

摘要： Batch tests with mixed microbial culture were conducted to investigate the role and influence of S/N ratios, source carbon and alkalinity on the inhibition effects of sulfate reduction by denitrification. It was found that sulfate reduction could not be completely inhibited in uncultured sludge due to the disturbance of intracellular sulfate, while sulfide production rate decreased with S/N ratio and produced sulfide could be removed by autotrophic denitrification at S/N ratio lower than 1.0. Three stages (such as activity recovery, denitrification inhibition and sulfate reduction restarting) were observed in pre-cultured sludge tests, and duration of inhibition time increased with nitrate contents. Produced rate of sulfide after nitrate depletion decreased with S/N ratios, and it reduced by 57.03% at S/N of 0.5 comparing with no nitrate addition. It was also found that nitrate reduction rate changed negatively with initial nitrate concentration and little influence of sulfate on denitrification was observed (only 10.1% at 135 mg/L sulfate). Sodium acetate and ethanol was the suitable carbon source for denitrifying bacteria (DNB), while sodium lactate was both for DNB and sulfate reducing bacteria (SRB). The most obvious inhibition effects were found in tests with sodium acetate, ethanol and sodium formate as carbon sources. Alkalinity was found obviously influencing the produced rate and duration time of sulfide in inhibition process, and lower SRB activity was observed at higher alkalinity, benefitting the inhibition of denitrification on sulfate reduction.

分类号： X

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