Yin Zhixuan, Xie Li, Zhou Qi
State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
State Key Laboratory of Pollution Control and Resources Reuse, Key Laboratory of Yangtze River Water Environment, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, PR China.
J Biosci Bioeng. 2015 Oct;120(4):426-31. doi: 10.1016/j.jbiosc.2015.02.004. Epub 2015 Mar 20.
The effects of sulfide on the integration of denitrification with anaerobic digestion using anaerobic effluents of cassava stillage as carbon source were investigated. Batch tests indicated that nitrate reduction efficiencies decreased from 96.5% to 15.8% as sulfide/nitrate (S/NO3(-)-N) ratios increased from 0.27 to 1.60. At low S/NO3(-)-N ratios (0.27-1.08) anaerobic acidogenesis was accelerated. Nitrate was reduced to nitrite via sulfur-based autotrophic denitrification, after which the formed nitrite and residual nitrate were converted to N2 via heterotrophic denitrification. Increases in the S/NO3(-)-N ratio (1.60) caused a shift (76.3%) in the nitrate reduction pathway from denitrification to dissimilatory nitrate reduction to ammonia (DNRA). Sulfide concentrations (S/NO3(-)-N ratio of 1.60) suppressed not only heterotrophic denitrification but also acidogenesis. The potentially toxic effect of sulfide on acid production was mitigated by its rapid oxidation to sulfur, allowing the recovery of acidogenesis.
研究了硫化物对以木薯酒精废液厌氧出水为碳源的反硝化与厌氧消化耦合过程的影响。批次试验表明，随着硫化物/硝酸盐（S/NO3(-)-N）摩尔比从0.27增加到1.60，硝酸盐还原效率从96.5%降至15.8%。在低S/NO3(-)-N摩尔比（0.27 - 1.08）时，厌氧产酸过程加速。硝酸盐通过基于硫的自养反硝化作用还原为亚硝酸盐，之后生成的亚硝酸盐和残留硝酸盐通过异养反硝化作用转化为N2。S/NO3(-)-N摩尔比增加至1.60时，硝酸盐还原途径发生转变，76.3%的硝酸盐还原从反硝化转变为异化硝酸盐还原为氨（DNRA）。硫化物浓度（S/NO3(-)-N摩尔比为1.60）不仅抑制了异养反硝化作用，还抑制了产酸过程。硫化物对产酸的潜在毒性作用因其快速氧化为硫而减轻，使得产酸过程得以恢复。
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