Journal of Digital Convergence (디지털융복합연구)

The Society of Digital Policy and Management (한국디지털정책학회)
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A Case Study on Cost-Benefit Analysis of the Septic Tank and Exclusive Sewage Pipe Line in Designing the large Building at Combined Sewer District

합류식 하수도 지역에 대형 건축물 설계시 정화조 및 전용오수관로의 비용편익분석 사례연구

  • Oh, Hyun-Taek (Division of Business Administration, Cheongju University) ;
  • Kim, Sung-Tai (Department of Economics, Cheongju University) ;
  • Lim, Byung-In (Department of Economics, Chungbuk University) ;
  • Kang, Byong-Jun (Industry-University Cooperation Foundation, Chung-Ang University) ;
  • Park, Kyoo-Hong (Department of Civil Engineering, Chung-Ang University)
  • 오현택 (청주대학교 경영학부) ;
  • 김성태 (청주대학교 경제학과) ;
  • 임병인 (충북대학교 경제학과) ;
  • 강병준 (중앙대학교 산학협력단) ;
  • 박규홍 (중앙대학교 사회기반시스템공학부)
  • Received : 2019.04.28
  • Accepted : 2019.06.20
  • Published : 2019.06.28
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Abstract

The aim of this study is to examine the relative economic benefits between the septic tank and exclusive sewage pipe line in designing the large building at combined sewer districts. With the case study of Lotte World Tower Building, we analyze a cost-benefit between two alternatives. The research results showed 2 years of payback period, about ￦6.17 billion of NPV, and 1.93 of B/C ratio for installing the exclusive sewage pipe line in comparison with septic tank. This results provide useful guidelines for policy establishment of the septic tank closure and for plausibility of installing exclusive sewage pipe line when constructing a large building. In the future, it will be necessary to consider additional cost-benefit analysis including burden charge borne by causers, the burden of management responsibility with a exclusive sewage pipe line, and the economic benefits of reducing odor.

본 연구의 목적은 합류식 하수처리구역 내에 대형 건축물을 건설하는 경우, 정화조를 설치하는 대안과 정화조를 대신하여 전용오수관로를 설치하는 대안의 경제성을 비교분석하는 것이다. 이를 위해 우리나라 대표적 대형 건축물인 롯데월드타워의 사례를 들어 두 대안 간의 비용편익분석을 수행하였다. 롯데월드타워 건물에 정화조를 설치하는 대신에 전용오수관로를 설치할 경우, 회수기간은 6.2년, 순현재가치(NPV)는 약 61.7억 원이 발생하며, B/C비율은 1.93인 것으로 나타났다. 이러한 사례분석 결과는 향후 정화조 폐쇄에 대한 정책수립과 대형 건축물 신축 시 전용오수관로 건설에 대한 타당성을 검토할 때 적용할 수 있는 유용한 지침을 제공해 줄 것으로 보인다. 향후에는 원인자부담금과 전용오수관로 관리책임 부담여부, 악취감소에 따른 경제적 효익 등을 비용편익분석에 추가적으로 고려할 필요가 있다.

Keywords

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Fig. 1. Measurement of distance to sewage treatment facilities

Table 1. Construction and operation cost of septic tank

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Table 2. Construction costs of Plastic sewer pipe

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Table 3. Summary of cost-benefit items

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Table 4. cost-benefit analysis for exclusive sewage pipe line

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