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

•Proving a combined metabolic uncoupler had synergetic effect on sludge reduction.•Applying EEM fluorescence spectroscopy studied the effects of uncouplers.•Activated sludge became easier to react with the novel combined uncoupler. The present study investigated the synergistic effects of a novel co...

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Bibliographic Details
Published in:Bioresource technology 2013-09, Vol.143, p.642-646
Main Authors: Feng, Xiao-Chi, Guo, Wan-Qian, Chen, Chuan, Yang, Shan-Shan, Jin, Wen-Biao, Ren, Nan-Qi, Zheng, He-Shan, Du, Juan-Shan, Liu, Bo
Format: Article
Language:English
Subjects:
Applied sciences
Biological and medical sciences
Bioreactors
Chlorophenols - chemistry
EEM
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Metabolic uncoupler
Pollution
RSM
Salicylanilides - chemistry
Sewage
Sludge reduction
Surface Properties
Wastes
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Summary:•Proving a combined metabolic uncoupler had synergetic effect on sludge reduction.•Applying EEM fluorescence spectroscopy studied the effects of uncouplers.•Activated sludge became easier to react with the novel combined uncoupler. 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.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2013.05.119