Abstract
This paper is to explore the feasibility of a novel combined uncoupler of 3,3ˊ,4ˊ,5-tetrachlorosalicylanilide (TCS) and 2,4,6-trichlorophenol (TCP) on excess activated sludge reduction compared to single dose of TCS and TCP. Four sequenced batch reactors (SBR) were continuously operated during two-month period dosed by different concentration of metabolic uncoupler. The comparative experiments showed that the combined uncoupler could effectively limit sludge yield by approximately 52%, followed by TCS, TCP, without obvious affecting the TOC removal rate and SVI value. At the end of the operation, the variation of zeta potential clearly indicated that uncoupler dosing affected the flocculability of activated sludge. The study demonstrated applying a combined uncoupler was feasible and promising technique to reduce sludge yield in SBR.
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