title: Enhanced elementary sulfur recovery in integrated sulfate-reducing, sulfur-producing rector under micro-aerobic condition.
abstract: Biological treatment of sulfate-laden wastewater consists of two separate reactors to reduce sulfate to sulfide by sulfate-reducing bacteria (SRB) and to oxidize sulfide to sulfur (S(0)) by sulfide oxidation bacteria (SOB). To have SRB+SOB in a single reactor faced difficulty of low S(0) conversion. This study for the first time revealed that dissolved oxygen (DO) level can be used to manipulate SRB+SOB reactions in a single reactor. This work demonstrated successful operation of an integrated SRB+SOB reactor under micro-aerobic condition. At DO = 0.10-0.12 mg l(-1), since the activities of SOB were enhanced by limited oxygen, the removal efficiency for sulfate reached 81.5% and the recovery of S(0) peaked at 71.8%, higher than those reported in literature. At increased DO, chemical oxidation of sulfide with molecular oxygen competed with SOB so conversion of S(0) started to decline. At DO>0.30 mg l(-1) activities of SRB were inhibited, leading to failure of the SRB+SOB reactor.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
authors.forename: Xi-jun
authors.initials: XJ
authors.lastname: Xu
authors.forename: Chuan
authors.initials: C
authors.lastname: Chen
authors.forename: Ai-jie
authors.initials: AJ
authors.lastname: Wang
authors.forename: Ning
authors.initials: N
authors.lastname: Fang
authors.forename: Ye
authors.initials: Y
authors.lastname: Yuan
authors.forename: Nan-qi
authors.initials: NQ
authors.lastname: Ren
authors.forename: Duu-jong
authors.initials: DJ
authors.lastname: Lee
mesh_terms: D000332:Aerobiosis; D001419:Bacteria / Q000378:metabolism*; D061249:Batch Cell Culture Techniques; D001673:Biodegradation, Environmental; D019149:Bioreactors / Q000382:microbiology*; D010084:Oxidation-Reduction; D010100:Oxygen / Q000032:analysis; D012995:Solubility; D013431:Sulfates / Q000378:metabolism*; D013455:Sulfur / Q000302:isolation & purification* / Q000378:metabolism*; D013997:Time Factors
chemical_list: D013431:Sulfates; D013455:Sulfur; D010100:Oxygen