title: Evaluation of performance and microbial community in a two-stage UASB reactor pretreating acrylic fiber manufacturing wastewater.
abstract: A two-stage UASB reactor was employed to pretreat acrylic fiber manufacturing wastewater. Mesophilic operation (35 ± 0.5°C) was performed with hydraulic retention time (HRT) varied between 28 and 40 h. Mixed liquor suspended solids (MLSS) in the reactor was maintained about 8000 mg/L. The results showed COD and sulfate removal could be kept at 51% and 75%, respectively, when the HRT was no less than 38 h. Sulfate reduction mainly occurred in the acidification-stage reactor while methane production mainly occurred in the methane-stage reactor. The size of granule formed in the acidification-stage reactor ranged between 1 and 5mm while the largest size of granule in the methane-stage reactor ranged from 0.5 to 2mm. Compared to microbial populations in the acidification-stage reactor, the microbial diversity in methane-stage reactor was more abundant. In the acidification-stage reactor, the Syntrophobacter sulfatireducens devoted to both sulfate reduction and acetate production.
authors: State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, PR China.
authors: Jin
authors: J
authors: Li
authors: Jun
authors: J
authors: Wang
authors: Zhaokun
authors: Z
authors: Luan
authors: Yanqin
authors: Y
authors: Deng
authors: Lin
authors: L
authors: Chen
mesh_terms: D000143:Acids / Q000737:chemistry; D001419:Bacteria / Q000145:classification / Q000235:genetics / Q000378:metabolism; D001483:Base Sequence; D019149:Bioreactors; D017931:DNA Primers; D004275:DNA, Ribosomal / Q000235:genetics; D007700:Kinetics; D010802:Phylogeny; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012722:Sewage / Q000382:microbiology; D014873:Water Pollutants
chemical_list: D000143:Acids; D017931:DNA Primers; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D014873:Water Pollutants