title: Correlation between microbial diversity and toxicity of sludge treating synthetic wastewater containing 4-chlorophenol in sequencing batch reactors.
abstract: The relationship between microbial diversity and sludge toxicity in the biotreatment of refractory wastewater was investigated. Synthetic wastewater containing 4-chlorophenol (4-CP) was treated by an activated sludge using a sequencing batch bioreactor (SBR). At the end of a single SBR cycle, a stable operation stage was reached when the 4-CP was not detected both in aqueous and sludge phases and the effluent COD was maintained at approximately 70 mg L(-1) for the blank and control sludge groups. Then, the diversity of the microorganisms and the sludge toxicity were measured. The results showed that the Microtox acute toxicity of the control sludge was higher than those of the blank sludge. The difference analysis of the microbial diversity between the blank and control sludge indicated that the sludge toxicity was closely related to microbial diversity.
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China; Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Eduaction, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, China.
authors.forename: Jianguo
authors.initials: J
authors.lastname: Zhao
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China. Electronic address: xrchen@ecust.edu.cn.
authors.forename: Xiurong
authors.initials: X
authors.lastname: Chen
authors.affiliation: Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control, Ministry of Eduaction, Henan Key Laboratory for Environmental Pollution Control, Henan Normal University, Xinxiang, 453007, China.
authors.forename: Linlin
authors.initials: L
authors.lastname: Bao
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Bao
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
authors.forename: Yixuan
authors.initials: Y
authors.lastname: He
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
authors.forename: Yuying
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China.
authors.forename: Jiahui
authors.initials: J
authors.lastname: Li
mesh_terms: D001673:Biodegradation, Environmental; D019149:Bioreactors; D002681:China; D002733:Chlorophenols / Q000633:toxicity*; D058645:Denaturing Gradient Gel Electrophoresis; D064307:Microbiota / Q000187:drug effects*; D016133:Polymerase Chain Reaction; D012722:Sewage / Q000032:analysis*; D014865:Waste Disposal, Fluid; D062065:Wastewater / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000633:toxicity*
chemical_list: D002733:Chlorophenols; D012722:Sewage; D062065:Wastewater; D014874:Water Pollutants, Chemical; C029107:4-chlorophenol
keywords: 4-Chlorophenol; Microbial diversity; Sequencing batch reactor; Sludge toxicity; Synthetic wastewater