Xu X.-J.Chen C.Wang A.-J.Fang N.Yuan Y.Ren N.-Q.Lee D.-J.2019-05-142019-05-14201209608524https://scholars.lib.ntu.edu.tw/handle/123456789/408374Biological 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=0.10-0.12mgl -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>0.30mgl -1 activities of SRB were inhibited, leading to failure of the SRB+SOB reactor. ? 2012 Elsevier Ltd.Elemental sulfur recoveryIntegrated processMicro-aerobic conditionSulfate reducingSulfide oxidizingjournal article10.1016/j.biortech.2012.03.0952-s2.0-84861676483https://www.scopus.com/inward/record.uri?eid=2-s2.0-84861676483&doi=10.1016%2fj.biortech.2012.03.095&partnerID=40&md5=48db728635a483f45a4e0bc423b7310e