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Effects of metabolic uncouplers on excess sludge reduction and microbial products of activated sludge

Publication date: June 2015
Source:Bioresource Technology, Volume 185

Author(s): Fang Fang , Hai-Lan Hu , Min-Min Qin , Zhao-Xia Xue , Jia-Shun Cao , Zhi-Rong Hu

The present study investigated the influences of three metabolic uncouplers (pCP, oCP and oNP) on excess activated sludge reduction and microbial products of extracellular polymeric substances (EPS) and intracellular storage product (polyhydroxybutyrate, PHB) in short-term tests. Results showed sludge was reduced 58.2%, 59.8% and 80.8%, respectively, at pCP, oCP and oNP concentrations of 20mg/L. The dosage of three uncouplers had no obviously influences on COD removal and sludge settleability, but had significant inhibition effect on ammonia removal, especially for oNP. Low concentration of pCP and oNP (5mg/L) dosing resulted in protein and polysaccharide content increased in EPS, however, they were decreased at high pCP and oNP concentrations (>5mg/L). To oCP, the protein content in EPS was increased linearly with oCP concentration. Furthermore, metabolic uncouplers addition stimulated the production of PHB. Among three uncouplers, oCP could be an alternative uncoupler for sludge reduction in activated sludge process.

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This project has received funding from the European Unionís Seventh Framework Programme for research, technological development and demonstration