期刊
BIORESOURCE TECHNOLOGY
卷 232, 期 -, 页码 417-422出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.02.031
关键词
Denitrifying sulfide removal; High C/N molar ratio; Micro-aerobic condition
资金
- National Natural Science Foundation of China [51576057, 51676057, 51308147]
- Fundamental Research Funds for Central Universities [AUGA5710055514]
- State Key Laboratory of Urban Water Resource and Environment (Harbin Institute of Technology) [2015DX04]
- Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology [HC201526-02]
The success of denitrifying sulfide removal (DSR) processes, which simultaneously degrade sulfide, nitrate and organic carbon in the same reactor, counts on synergetic growths of autotrophic and heterotrophic denitrifiers. Feeding wastewaters at high C/N ratio would stimulate overgrowth of heterotrophic bacteria in the DSR reactor so deteriorating the growth of autotrophic denitrifiers. The DSR tests at C/N = 1.26: 1, 2: 1 or 3: 1 and S/N = 5: 6 or 5: 8 under anaerobic (control) or micro-aerobic conditions were conducted. Anaerobic DSR process has <50% sulfide removal with no elemental sulfur transformation. Under micro-aerobic condition to remove <5% sulfide by chemical oxidation pathway, 100% sulfide removal is achieved by the DSR consortia. Continuous-flow tests under micro-aerobic condition have 70% sulfide removal and 55% elemental sulfur recovery. Trace oxygen enhances activity of sulfide-oxidizing, nitrate-reducing bacteria to accommodate properly the wastewater with high C/N ratios. (C) 2017 Elsevier Ltd. All rights reserved.
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