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Available Technology and Integrated Management Plan for Energy-positive in the Sewage Treatment Plant

에너지 생산형 하수처리장을 위한 가용 기술과 통합관리 방안

  • Song, Minsu (Department of Civil and Environmental Engineering, Pusan National University) ;
  • Kim, Hyoungho (Busan Environmental Corporation) ;
  • Bae, Hyokwan (Department of Civil and Environmental Engineering, Pusan National University)
  • 송민수 (부산대학교 사회환경시스템공학과) ;
  • 김형호 (부산환경공단) ;
  • 배효관 (부산대학교 사회환경시스템공학과)
  • Received : 2019.12.27
  • Accepted : 2020.01.30
  • Published : 2020.01.30

Abstract

Because of the intensified environmental problems such as climate change and resource depletion, sewage treatment technology focused on energy management has recently attracted attention. The conversion of primary sludge from the primary sedimentation tank and excessive sludge from the secondary sedimentation tank into biogas is the key to energy-positive sewage treatment. In particular, the primary sedimentation tanks recover enriched biodegradable organic matter and anaerobic digestion process produces methane from the organic wastes for energy production. Such technologies for minimizing oxygen demand are leading the innovation regarding sewage treatment plants. However, sewage treatment facilities in Korea lack core technology and operational know-how. Actually, the energy potential of sewage is higher than sewage treatment energy consumption in the sewage treatment, but current processes are not adequately efficient in energy recovery. To improve this, it is possible to apply chemically enhanced primary treatment (CEPT), high-rate activated sludge (HRAS), and anaerobic membrane bioreactor (AnMBR) to the primary sedimentation tank. To maximize the methane production of sewage treatment plants, organic wastes such as food waste and livestock manure can be digested. Additionally, mechanical pretreatment, thermal hydrolysis, and chemical pretreatment would enhance the methane conversion of organic waste. Power generation systems based on internal combustion engines are susceptible to heat source losses, requiring breakthrough energy conversion systems such as fuel cells. To realize the energy positive sewage treatment plant, primary organic matter recovery from sewage, biogas pretreatment, and co-digestion should be optimized in the energy management system based on the knowledge-based operation.

Acknowledgement

Supported by : 한국연구재단

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