An Analysis of Potential Environmental Impact Reduction for Combined Sewer Overflow Project using a LCA Methodology

LCA 기법을 활용한 합류식 하수도 월류수 사업의 잠재적 환경영향 저감효과 분석

  • Jo, Hyun-Jung (Department of Environmental Engineering, Inha University) ;
  • Song, Jang-Hwan (Department of Environmental Engineering, Inha University) ;
  • Hwang, Yong-Woo (Department of Environmental Engineering, Inha University) ;
  • Park, Ji-Hyoung (Department of Environmental Engineering, Inha University)
  • Published : 2011.12.15


In this study, LCA(Life Cycle Assessment) on 'Saemangum CSO Project' was carried out to evaluate environmental impact which occurred during the construction and operation periods and the potential environmental impact reduction was analyzed by comparing production and reduction level of pollution loads. LCA was conducted out according to the procedure of ISO14040 which suggested Goal and Scope Definition, Life Cycle Inventory Analysis, Life Cycle Impact Assessment and Interpretation. In the Goal and Scope Definition, the functional unit was 1 m3 of CSO, the system boundary was construction and operation phases, and the operation period was 20 years. For the data collection and inventory analysis, input energies and materials from civil, architecture, mechanical and electric fields are collected from design sheet but the landscape architecture field is excepted. LCIA(Life Cycle Impact Assessment) was performed following the procedure of Eco-Labelling Type III under 6 categories which were resource depletion, eutrophication, global warming, ozone-layer destruction, and photochemical oxide formation. In the result of LCA, 83.4% of environmental impact occurred in the construction phase and 16.6% in the operation phase. Especially 78% of environmental impact occurred in civil works. The Global warming category showed the highest contribution level in the environmental impact categories. For the analysis on potential environmental impact reduction, the reduction and increased of environmental impact which occurred on construction and operation phases were compared. In the case of considering only the operation phase, the result of the comparison showed that 78% of environmental impact is reduced. On the other hand, when considering both the construction and operation phases, 50% of environmental impact is increase. Therefore, this study showed that eco-friendly material and construction method should be used for reduction of environmental impact during life cycle, and it is strongly necessary to develop technology and skills to reduce environmental impact such as renewable energies.



  1. 환경부, 하수도통계(2008).
  2. 환경부, 합류식 하수도 월류수(CSO) 오염부하 저감시설설치 타당성 조사(2007).
  3. 환경부, 4대강 비점오염원관리 종합대책 pp. 22-23, 79 (2004).
  4. 환경관리공단, 경산1산업단지 완충저류시설 설치사업 기본 및 실시설계 보고서 (2009).
  5. 박광호, 황용우, "LCA 기법을 이용한 하수처리장의 환경영향 평가", 상하수도학회지, 19(6), pp 809-818 (2005).
  6. E. Friedrich, "Life-Cycle Assessment as an Environmental Management Tool in the Production of Potable Water", Water Science and Technology, 46(9), pp. 29-36 (2002).
  7. T. Ekvall and G. Finnveden, "Allocation in ISO 14041-a Critical Review", Journal of Cleaner Production, 9(3), pp. 197-208.
  8. 지식경제부, 환경친화적 산업기반 구축을 위한 환경경영 표준화