title: Microbial community of aerobic granules for ammonium and sulphide removal in a sequencing batch reactor.
abstract: Aerobic granules for sulphide and ammonium removal were cultivated in a sequencing batch reactor, and the microbial community of the aerobic granules was investigated by denaturing gradient gel electrophoresis. The loading rate increased from 0.15 to 0.9 kg S2− m−3 d−1, and the removal efficiencies of sulphide, chemical oxygen demand, and NH4 +-N were higher than 99, 80, and 98%, respectively. However, sludge settleability became poorer when the loading rate exceeded 0.3 kg S2− m−3 d−1. The denitrifying bacteria in the aerobic granules were Thauera sp., Pseudomonas alcaligenes, and uncultured planctomycetes, indicating that multiple N-removing processes occurred simultaneously in the aerobic granules. These processes could include nitrification and denitrification, aerobic denitrification, and anaerobic ammonia oxidation. Sludge settleability became poorer because of the overgrowth of uncultured Thiothrix sp.
authors.affiliation: Institute of Environmental Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450011, China. sucaili@ncwu.edu.cn
authors.forename: Caili
authors.initials: C
authors.lastname: Su
authors.forename: Lingfeng
authors.initials: L
authors.lastname: Zhu
authors.forename: Chuan
authors.initials: C
authors.lastname: Zhang
authors.forename: Xianghui
authors.initials: X
authors.lastname: Qi
authors.forename: Yiping
authors.initials: Y
authors.lastname: Guo
authors.forename: Ruqin
authors.initials: R
authors.lastname: Gao
mesh_terms: D000332:Aerobiosis; D001419:Bacteria / Q000145:classification* / Q000235:genetics* / Q000378:metabolism; D058448:Biota; D004269:DNA, Bacterial / Q000737:chemistry / Q000235:genetics; D004275:DNA, Ribosomal / Q000737:chemistry / Q000235:genetics; D058645:Denaturing Gradient Gel Electrophoresis; D059013:Microbial Consortia; D000644:Quaternary Ammonium Compounds / Q000378:metabolism*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA; D013440:Sulfides / Q000378:metabolism*; D014871:Water Microbiology
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D000644:Quaternary Ammonium Compounds; D012336:RNA, Ribosomal, 16S; D013440:Sulfides