State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, Harbin 150090, China.
Appl Microbiol Biotechnol. 2011 May;90(3):1129-36. doi: 10.1007/s00253-011-3087-8. Epub 2011 Feb 1.
Denitrifying sulfide removal (DSR) processes simultaneously convert sulfide, nitrate, and chemical oxygen demand from industrial wastewater into elemental sulfur, dinitrogen gas, and carbon dioxide, respectively. The failure of a DSR process is signaled by high concentrations of sulfide in reactor effluent. Conventionally, DSR reactor failure is blamed for overcompetition for heterotroph to autotroph communities. This study indicates that the elementary sulfur produced by oxidizing sulfide that is a recoverable resource from sulfide-laden wastewaters can be reduced back to sulfide by sulfur-reducing Methanobacterium sp. The Methanobacterium sp. was stimulated with excess organic carbon (acetate) when nitrite was completely consumed by heterotrophic denitrifiers. Adjusting hydraulic retention time of a DSR reactor when nitrite is completely consumed provides an additional control variable for maximizing DSR performance.
反硝化脱硫（DSR）工艺可将工业废水中的硫化物、硝酸盐和化学需氧量分别转化为元素硫、氮气和二氧化碳。DSR 工艺的失效表现为反应器出水中高浓度的硫化物。传统上，DSR 反应器的失效被归咎于异养生物对自养生物群落的过度竞争。本研究表明，由富含硫化物的废水中回收的硫化物氧化产生的单质硫可被产甲烷菌还原回硫化物。当异养硝酸盐还原菌完全消耗亚硝酸盐时，用过量有机碳（乙酸盐）刺激产甲烷菌。当亚硝酸盐完全消耗时，调整 DSR 反应器的水力停留时间为最大程度地提高 DSR 性能提供了另一个控制变量。
