Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Effect of 3,3',4',5-Tetrachlorosalicylanilide on Reduction of Excess Sludge and Nitrogen Removal in Biological Wastewater Treatment Process

  • Rho, Sang-Chul (Department of Environmental Engineering and Biotechnology, Myongji University) ;
  • Nam, Gil-Nam (Department of Environmental Engineering and Biotechnology, Myongji University) ;
  • Shin, Jee-Young (Department of Environmental Engineering and Biotechnology, Myongji University) ;
  • Jahng, Deok-Jin (Department of Environmental Engineering and Biotechnology, Myongji University)
  • Published : 2007.07.31
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Abstract

A metabolic uncoupler, 3,3',4',5-tetrachlorosalicylanilide (TCS), was used to reduce excess sludge production in biological wastewater treatment processes. Batch experiments confirmed that 0.4 mg/l of TCS reduced the aerobic growth yield of activated sludge by over 60%. However, the growth yield remained virtually constant even at the increased concentrations of TCS when cultivations were carried out under the anoxic condition. Reduction of sludge production yield was confirmed in a laboratory-scale anoxic-oxic process operated for 6 months. However, it was found that ammonia oxidation efficiency was reduced by as much as 77% in the presence of 0.8 mg/l of TCS in the batch culture. Similar results were also obtained through batch inhibition tests with activated sludges and by bioluminescence assays using a recombinant Nitrosomonas europaea (pMJ217). Because of this inhibitory effect of TCS on nitrification, the TCS-fed continuous system failed to remove ammonia in the influent. When TCS feeding was stopped, the nitrification yield of the process was resumed. Therefore, it seems to be necessary to assess the nitrogen content of wastewater if TCS is used for reducing sludge generation.

Keywords

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