title: Enhanced performance of denitrifying sulfide removal process at high carbon to nitrogen ratios under micro-aerobic condition.
abstract: 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.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang Province 150090, China.
authors.forename: Chuan
authors.initials: C
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang Province 150090, China.
authors.forename: Ruo-Chen
authors.initials: RC
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang Province 150090, China.
authors.forename: Xi-Jun
authors.initials: XJ
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang Province 150090, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Fang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang Province 150090, China.
authors.forename: Ai-Jie
authors.initials: AJ
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang Province 150090, China.
authors.forename: Nan-Qi
authors.initials: NQ
authors.lastname: Ren
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang Province 150090, China; Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan. Electronic address: djlee@ntu.edu.tw.
authors.forename: Duu-Jong
authors.initials: DJ
authors.lastname: Lee
mesh_terms: D000085:Acetates / Q000032:analysis; D000332:Aerobiosis / Q000187:drug effects; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D061249:Batch Cell Culture Techniques; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000494:pharmacology*; D058440:Denitrification / Q000187:drug effects*; D009566:Nitrates / Q000032:analysis; D009584:Nitrogen / Q000494:pharmacology*; D010084:Oxidation-Reduction / Q000187:drug effects; D013440:Sulfides / Q000302:isolation & purification*; D013997:Time Factors
chemical_list: D000085:Acetates; D009566:Nitrates; D013440:Sulfides; D002244:Carbon; D009584:Nitrogen
keywords: Denitrifying sulfide removal; High C/N molar ratio; Micro-aerobic condition