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Comparison of Characteristics of Nonpoint Source Pollution from Separate and Combined Sewer System

합류식 월류수와 분류식 우수유출수의 비점오염물질 유출특성 비교

  • Shin, Min Hwan (Korea Water Environment Research Institute) ;
  • Jeon, Ji-Hong (Department of Environmental Engineering, Andong National University)
  • 신민환 ((사)한국수계환경연구소) ;
  • 전지홍 (국립안동대학교 환경공학과)
  • Received : 2016.12.19
  • Accepted : 2017.01.24
  • Published : 2017.01.30

Abstract

In this study, the characteristics of nonpoint source pollutant loads from separate sewer overflow (SSO) and combined sewer overflow (CSO) were evaluated during 2016 in Namyangju city, Korea. Five rainfall events were monitored during 2016 with ranging from 14.5 mm to 121.5 mm. The runoff ratio of CSO was higher than that of SSO because only design volume of maximum sanitary sewer ($1Q_h$) was transported and treated and $2Q_h$ was overflowed to waterbody during rainy day although combined sewer system was designed to transport $3Q_h$ to treatment system. The event mean concentrations (EMCs) and pollutant loads from CSO were higher than those from SSO. BOD and COD of CSO, and TOC and TN of SSO represented distinct first flush phenomena. The inadequate management in combined sewer system from which the untreated $2Q_h$ from CSO was overflowed to waterbody during rainy day could influence on high pollutant loads and first flushing. Treating $2Q_h$ from CSO, source control such as low impact development, and treating outflow from SSO were strongly recommended to control non-point source pollution in urban area.

Keywords

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