title: Effects of lead concentration and accumulation on the performance and microbial community of aerobic granular sludge in sequencing batch reactors.
abstract: The present study investigated the effects of lead on the morphological structure, physical and chemical properties, wastewater treatment performance and microbial community structure of aerobic granular sludge (AGS) in sequencing batch reactors (SBRs). The results showed that at Pb(2+) concentration of 1 mg/L, the mixed liquid suspended solids decreased, the settling velocity increased and the sludge volume index increased sharply. Meanwhile, AGS began to disintegrate and show an irregular shape. In terms of wastewater treatment in an SBR, the phosphorus removal rate was affected only until the Pb(2+) concentration was up to 1 mg/L. The [Formula: see text] removal efficiency began to decline when the Pb(2+) concentration increased to 6 mg/L, while the removal of chemical oxygen demand increased slightly within the Pb(2+) concentration range of 1-6 mg/L. Significant changes were observed in the microbial community structure, especially the dominant bacteria. Compared to the Pb(2+) accumulation on the sludge, the Pb(2+) concentration in the aqueous phase played a more important role in the performance and microbial community of AGS in SBRs.
authors.affiliation: a Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy , Peking University Shenzhen Graduate School , Shenzhen , People's Republic of China.
authors.forename: Guangcai
authors.initials: G
authors.lastname: Tan
authors.affiliation: a Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy , Peking University Shenzhen Graduate School , Shenzhen , People's Republic of China.
authors.forename: Nan
authors.initials: N
authors.lastname: Xu
authors.affiliation: a Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy , Peking University Shenzhen Graduate School , Shenzhen , People's Republic of China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.affiliation: a Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy , Peking University Shenzhen Graduate School , Shenzhen , People's Republic of China.
authors.forename: Hongshan
authors.initials: H
authors.lastname: Hao
authors.affiliation: b College of Environmental Sciences and Engineering, Peking University , The Key Laboratory of Water and Sediment Sciences, Ministry of Education , Beijing , People's Republic of China.
authors.forename: Weiling
authors.initials: W
authors.lastname: Sun
mesh_terms: D064751:Ammonium Compounds / Q000032:analysis; D001419:Bacteria / Q000187:drug effects; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D004269:DNA, Bacterial / Q000235:genetics; D007854:Lead / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D064751:Ammonium Compounds; D004269:DNA, Bacterial; D012336:RNA, Ribosomal, 16S; D012722:Sewage; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D007854:Lead
keywords: Aerobic granular sludge; accumulation; lead; microbial community structure; sequencing batch reactor