Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Study on Energy Independence Plan and Economic Effects for Sewage Treatment Plant

하수처리시설의 에너지자립화 및 경제적 효과분석

  • Park, Kihak (Department of Environment Energy Engineering, Suwon University) ;
  • Lee, Hosik (Department of Railroad Infra System Engineering, Korea National University of Transportation) ;
  • Ha, Junsu (Blue technology co. ltd) ;
  • Kim, Keugtae (Department of Environment Energy Engineering, Suwon University) ;
  • Lim, Chaeseung (Department of Applied Microbiology, The University of Tokyo)
  • Received : 2020.09.28
  • Accepted : 2021.03.19
  • Published : 2021.03.30
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Abstract

It is generally known that a wastewater treatment plant (WWTP) consumes immense energy even if it can produce energy. With an aim to increase the energy independence rate of WWTP from 3.5% in 2010 to 50% in 2030, the Korean government has invested enormous research funds. In this study, cost-effective operating alternatives were investigated by analyzing the energy efficiency and economic feasibility for biogas and power generation using new and renewable energy. Based on the US EPA Energy Conservation Measures and Korea ESCO projects, energy production and independence rate were also analyzed. The main energy consumption equipment in WWTP is the blower for aeration, discharge pump for effluent, and pump for influent. Considering the processes of WWTP, the specific energy consumption rate of the process using media and MBR was the lowest (0.549 kWh/㎥) and the highest (1.427 kWh/㎥), respectively. Energy-saving by enhancing anaerobic digester efficiency was turned out to be efficient when in conjunction with stable wastewater treatment. The result of economic analysis (B/C ratio) was 2.5 for digestive gas power generation, 0.86 for small hydropower, 0.49 for solar energy, and 0.15 for wind energy, respectively. Furthermore, it was observed that the energy independence rate could be enhanced by installing energy production facilities such as solar and small hydropower and reducing energy consumption via the replacement of high-efficiency operating.

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