title: Treatability study of 3,3',4',5-tetrachlorosalicylanilide (TCS) combined with 2,4,6-trichlorophenol (TCP) to reduce excess sludge production in a sequence batch reactor.
abstract: The present study investigated the synergistic effects of a novel combined uncoupler of TCS and TCP on excess activated sludge reduction during a 60-day operation using a sequence batch reactor (SBR). Response surface methodology (RSM) was employed to obtain the optimal dosage of the combined uncoupler. The results of 60-day operation demonstrated the combined uncoupler had effectively reduced the sludge yield by approximately 52%, without serious affecting the substrate removal efficiency. The high sludge reduction rate revealed that it was feasible and effective to utilize a combined uncoupler to limit excess activated sludge. The three-dimensional excitation-emission matrix (EEM) fluorescence spectroscopy analysis of activated sludge with different metabolic uncouplers indicated that tryptophan, tyrosine protein-like substances and tryptophan, tyrosine amino-like substances were reduced by adding a combined uncoupler. Moreover, the variation of sludge components provided a better understanding of the effects of uncouplers on activated sludge reduction.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.
authors.forename: Xiao-Chi
authors.initials: XC
authors.lastname: Feng
authors.forename: Wan-Qian
authors.initials: WQ
authors.lastname: Guo
authors.forename: Chuan
authors.initials: C
authors.lastname: Chen
authors.forename: Shan-Shan
authors.initials: SS
authors.lastname: Yang
authors.forename: Wen-Biao
authors.initials: WB
authors.lastname: Jin
authors.forename: Nan-Qi
authors.initials: NQ
authors.lastname: Ren
authors.forename: He-Shan
authors.initials: HS
authors.lastname: Zheng
authors.forename: Juan-Shan
authors.initials: JS
authors.lastname: Du
authors.forename: Bo
authors.initials: B
authors.lastname: Liu
mesh_terms: D019149:Bioreactors; D002733:Chlorophenols / Q000737:chemistry*; D012458:Salicylanilides / Q000737:chemistry*; D012722:Sewage; D013499:Surface Properties
chemical_list: D002733:Chlorophenols; D012458:Salicylanilides; D012722:Sewage; C003390:3,3',4',5-tetrachlorosalicylanilide; C024564:2,4,6-trichlorophenol
keywords: EEM; Metabolic uncoupler; RSM; Sludge reduction