Journal of Wetlands Research (한국습지학회지)

Korean Wetlands Society (한국습지학회)
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Suggestions for Cost Improvement of High concentration Linked Treatment in Municipal Wastewater Treatment Plant

하수처리장에서의 연계처리수 요금 개선에 따른 경제성 분석

  • Lee, Jiwon (Department of Civil Engineering, Seoul National University of Science and Technology) ;
  • Gil, Kyungik (Department of Civil Engineering, Seoul National University of Science and Technology)
  • 이지원 (서울과학기술대학교 건설시스템공학과) ;
  • 길경익 (서울과학기술대학교 건설시스템공학과)
  • Received : 2020.04.20
  • Accepted : 2020.05.21
  • Published : 2020.05.31
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Abstract

Recently, high-concentration linked wastewater has been introduced into a nearby municipal wastewater treatment plants(MWTPs), but it is difficult to MWTP in local governments due to an unreasonable linked treatment charge system, and there is insufficient evidence or data to prove this. However, the MWTP, which is a national essential infrastructure, is generally exempt from the preliminary feasibility study, so there have been no cases where economic evaluation was conducted. Therefore, we proposed an improvement plan that can compensate for the disadvantages of the existing linked processing charges through previous studies. In this study, a comparative evaluation of how much economic feasibility can be improved compared to the existing ones when applying the improvement plan by conducting an economic analysis. For this, reference was made to the preliminary feasibility assessment data of the existing environmental facilities and the cost factors and benefit factors established during the modernization of the old sewage treatment facilities. As a result of the study, the B/C(Benefit/cost) value was quite low in the past, but when the improvement proposal proposed by the researchers was applied, it was confirmed that the B/C value increased close to 1. Therefore, it is considered to be very reasonable to calculate the linkage processing charge according to the linked wastewater load proposed by the researchers.

최근 고농도의 연계처리수를 인근 하수처리장으로 유입하고 있으나, 합리적이지 못한 연계처리 요금제도로 인해 지자체에서 하수처리 운영이 어려운 실정이며 이를 증명할 수 있는 근거나 데이터가 부족한 상황이다. 하지만, 국가 필수기반시설인 하수처리장은 일반적으로 예비타당성조사를 면제를 받기 때문에 경제성 평가를 실시한 사례가 전무하다. 따라서, 본 연구진은 선행연구를 통해 기존 연계처리 부과금의 단점을 보완할 수 있는 개선안을 제시하였고, 본 연구에서는 경제성분석을 실시하여 개선안을 적용하였을 때 기존 대비 얼마나 경제성이 개선될 수 있는지 비교평가를 하였다. 이를 위해 기존 환경시설의 예비타당성 평가 자료와 노후하수처리시설 현대화 진행 시 책정한 비용인자와 편익인자를 참고하였고, 연구진이 자체적으로 판단하였을 때 연계처리로 인해서 발생할 수 있는 편익 등을 고려하여 적용하였다. 연구결과 기존에는 B/C(Benefit/cost)값이 상당히 낮았으나, 연구진이 제안한 개선안을 적용하였을 경우 B/C값이 1에 가깝게 증가하는 것을 확인할 수 있었다. 따라서 본 연구진이 제안한 연계처리 부하에 따라 연계처리 부과금을 산정하는 방식은 매우 합리적이고 타당한 것으로 판단된다.

Keywords

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