Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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A Study on the Solubilization and Dewaterability of Ultrasonically Treated Wastewater Sludge

초음파 처리한 하수 슬러지의 가용화와 탈수 특성 연구

  • Youn, You-Sik (Department of Environmental Sciences & Biotechnology and Institute of Energy & Environment, Hallym University) ;
  • Kim, Dong-Jin (Department of Environmental Sciences & Biotechnology and Institute of Energy & Environment, Hallym University) ;
  • Yoo, Ik-Keun (School of Chemical Engineering and Bioengineering, University of Ulsan) ;
  • Ahn, Dae-Hee (Department of Environmental Engineering and Biotechnology, Myongji University)
  • 윤유식 (한림대학교 환경생명공학과 및 에너지.환경연구소) ;
  • 김동진 (한림대학교 환경생명공학과 및 에너지.환경연구소) ;
  • 유익근 (울산대학교 생명화학공학부) ;
  • 안대희 (명지대학교 환경생명공학과)
  • Published : 2009.06.30
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Abstract

Sludge minimization from wastewater treatment plant is becoming more important to save disposal costs and to contribute to sustainable development. For the reduction of sludge production, solubilization and dewaterability of sludge are important factors in sludge processing. Ultrasonic treatment has been used to enhance sludge solubility and dewaterability with anaerobic digestion sludge, primary sludge, and activated sludge. At the ultrasonic power of 0.2 kW/L for 1 hour, anaerobic sludge and activated sludge showed higher solubilization efficiency than the primary sludge in terms of COD, proteins, and suspended solids. Ultrasonic treatment decreased sludge dewaterability and sludge settling characteristics up to 720 kJ/L of ultrasonic energy. In conclusion, ultrasonic treatment was effective for sludge solubilization but it deteriorate dewaterability (specific resistance) and settling characteristics (SVI) of sludge at the experimental conditions.

Keywords

References

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