title: Evaluation of sludge reduction of three metabolic uncouplers in laboratory-scale anaerobic-anoxic-oxic process.
abstract: To evaluate the sludge reduction of three metabolic uncouplers (3,3',4',5-tetrachlorosalicylanilide (TCS), 2,4-dichlorophenol (DCP), and tetrakis (hydroxymethyl) phosphonium sulfate (THPS)), we conducted continuous experiments on laboratory-scale anaerobic-anoxic-oxic processes. The three metabolic uncouplers were separately added in each oxic tank of the three systems, and a system without uncoupler addition was used as control. During the 85-day operation, sludge production and observed growth yields decreased to 38.6% and 16.98%, 43.4% and 17.55%, and 39.3% and 17.04% by the addition of TCS, DCP, and THPS, respectively. The addition of metabolic uncouplers slightly reduced the wastewater treatment efficiencies of the system (about 1.1-8.7%) and increased sludge SVIs (about 69.9-80.6%). Meanwhile, the differences among three metabolic uncouplers were little. Besides metabolic uncoupling and maintenance metabolism, which exist in the TCS- and DCP-added systems, lysis-cryptic growth also exists in the THPS-added system.
authors.affiliation: School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.affiliation: Shenzhen Ocean Power Industrial Co., Ltd, Shenzhen 518040, China.
authors.forename: Hechao
authors.initials: H
authors.lastname: Li
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Jin
authors.initials: J
authors.lastname: Li
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Xuesong
authors.initials: X
authors.lastname: Guo
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
authors.forename: Junxin
authors.initials: J
authors.lastname: Liu
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China. Electronic address: byxiao@rcees.ac.cn.
authors.forename: Benyi
authors.initials: B
authors.lastname: Xiao
mesh_terms: D000693:Anaerobiosis; D002733:Chlorophenols / Q000737:chemistry*; D012458:Salicylanilides / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D018508:Water Purification
chemical_list: D002733:Chlorophenols; D012458:Salicylanilides; D012722:Sewage; C003390:3,3',4',5-tetrachlorosalicylanilide; C004762:2,4-dichlorophenol
keywords: Evaluation; Metabolic uncouplers; Sludge reduction; Sludge reduction mechanism; Wastewater treatment efficiency