Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Comparing the Inflow Rate of Sewage Treatment Plants Invested by the Public Funds or Public-Private Partnership (PPP) Projects

재정사업과 민간투자사업의 하수처리장 하수유입률 특성분석

  • Lee, Wonseok (Korea Development Institute) ;
  • Cho, Eunju (School of Civil, Environmental, and Architectural Engineering, Korea University) ;
  • Son, Younggyu (School of Civil, Environmental, and Architectural Engineering, Korea University) ;
  • Khim, Jeehyeong (School of Civil, Environmental, and Architectural Engineering, Korea University)
  • 이원석 (한국개발연구원 공공투자관리센터) ;
  • 조은주 (고려대학교 건축사회환경공학부) ;
  • 손영규 (고려대학교 건축사회환경공학부) ;
  • 김지형 (고려대학교 건축사회환경공학부)
  • Received : 2009.07.28
  • Accepted : 2009.09.01
  • Published : 2009.09.30
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Abstract

The purpose of this study is to figure out the differences of the inflow rates of Sewage Treatment Plants (STP), invested by public fund or public-private partnership (PPP). This paper finds that the average ratio of sewage inflow according to facility capacities (medium and small scale STP) was either nearly below 30% or above 100% in the first year. As the size of STP increased, there was decrease in the accuracy of demand assumption. This was because the operation time when the ratio of sewage inflow was uniform was different according to the size of STP, whereby the time was short when the STP were small. The design average ratio of sewage inflow was 10% larger than the real average ratio; this was considered overdesigned. In the case of a plant built by the PPP scheme, the average ratio of inflow of the STP before an abolition of MRG was larger than after the abolition of MRG. This may be explained by moral hazard from too much reliance on MRG. After the abolition of MRG, the demand risk of PPP was shifted from a PPP project to a conventional project.

Keywords

References

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