Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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A Study on Current Energy Consumption and Recycling at Public Wastewater Treatment Plants in Korea

국내 공공하수도 시설의 에너지 사용 및 자원화실태 조사연구

  • 박승호 (홍익대학교 기계시스템디자인공학과) ;
  • 김병주 (홍익대학교 기계시스템디자인공학과) ;
  • 배재호 (인하대학교 사회기반시스템공학부) ;
  • 이철모 ((주)한국종합기술 플랜트부) ;
  • 김응호 (홍익대학교 건설도시공학부)
  • Received : 2007.04.27
  • Accepted : 2007.08.27
  • Published : 2007.10.15
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Abstract

To establish effective and prompt measures for energy conservation in public wastewater treatment plants in Korea, energy consumption rates in 233 utilities in 9 provinces and 7 metropolitan cities are investigated and compared to the rest of the world. Mean load factor for wastewater treatment utilities is 74.9% and those for influent pumps and aeration blowers are 56.2% and 61.0%, respectively. Mean electrical energy usages as the key performance indicators are $0.243kWh/m^3$ for overall sewage treatments and 2.07 kWh per unit kg BOD removal. Digester gas as one of major byproducts in the process amounts to $382,000m^3/day$ nationwide. While major part of the digester gas is used for sludge heating, only 7.3% of the gas is utilized for electricity generation. Both efficiencies for BOD removal and digestion gas generation are considerably lower than those in USA and EU utilities due to low concentration of organic material in influent wastewater. Such low energy regeneration, in turn, results in significantly higher energy consumption in Korean plants, compared to that in USA and EU ones.

Keywords

Acknowledgement

Supported by : 환경부

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