Cost Analysis of Ocean Outfall and Tertiary Treatment Processes in Suyong Sewage Treatment Plant

수영 하수처리장 방류수의 해중 방류법과 3차 처리시설 설치시 비용 비교 분석

  • 박해식 (부경대학교 환경공학과) ;
  • 조은일 (제주대학교 환경공학과) ;
  • 박청길 (부경대학교 환경공학과)
  • Published : 1999.02.01

Abstract

Sewage has been almost treated by secondary treatment process. Secondary-treated effluent of sewage treatment plant caused the pollution of nearby beach. Nitrogen(N) and Phosphorus(P) in effluent water have caused many problems on estuary, such as red tide, eutrophication and aquatic toxicity. Therefore, the effective nitrogen and phosphorus removal from sewage treatment plants is necessary to prevent those pollution problems. However, little sewage treatment plant in Korea is effectively being operated for the removal of the nutrients. This study is analyzed for the effectiveness of cost when tertiary treatment process and Ocean Outfall are applied for the water quality of Suyong Bay After secondary treatment process, the effluent was discharged from the seabed in the depth of 32m of 4000m offshore. Pollutant concentration is decreased as much as the 180 times after the result of initial dilution, so that environmental protection requirement of Suyong Bay can satisfied. This Ocean Outfall process can save the 2.6~3.5 times as much as the cost of construction and operation for tertiary treatment process running over a 20 year.

Keywords

Cost Analysis;Ocean Outfall;Tertiary Treatment Processes

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