Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Spatial Characterization of Water Pollution in the Urban Stream Watershed (Gap Stream), Korea

도시하천(갑천) 유역에서 수질오염의 공간적 특성

  • Lee, Heung-Soo (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO)) ;
  • Hur, Jin (Department of Earth and Environmental Science, Sejong University) ;
  • Jeong, Seon-A (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO)) ;
  • Hwang, Soon-Jin (Department of Environmental Science, Konkuk University) ;
  • Shin, Jae-Ki (Korea Institute of Water and Environment, Korea Water Resources Corporation (KOWACO))
  • 이흥수 (한국수자원공사 수자원연구원) ;
  • 허진 (세종대학교 지구환경과학과) ;
  • 정선아 (한국수자원공사 수자원연구원) ;
  • 황순진 (건국대학교 환경과학과) ;
  • 신재기 (한국수자원공사 수자원연구원)
  • Received : 2006.06.28
  • Accepted : 2006.07.21
  • Published : 2006.09.30
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Abstract

Spatial distribution of water pollution in the Gap Stream was investigated from October to November, 2005. Sampling was conducted three times including effluents discharged from a wastewater treatment plant (WWTP) and a dam reservoir during the low-flow period. As a typical urban stream, total nitrogen and inorganic nitrogen concentrations increased toward downstream. Ammonia concentration was the highest in the treated water of the wastewater treatment plant and the lowest nitrate concentration was found in the effluent of the dam reservoir. A part of soluble reactive phosphorous (SRP) in total phosphorous was 22~54% in the upstream reach of WWTP in the Gap Stream whereas 68~73% in the downstream reach. Mean chlorophyll-a concentration ranged from 1.6 to $11.0{\mu}g/L$ and it tends to increase toward downstream except for WWTP effluent. As expected, untreated wastewater and WWTP effluent were suggested as the major sources of water pollution in the Gap Stream. In this study, the water pollution of the Gap Stream is a significant undergoing typical eutrophication, caused by excessive phosphorus and nitrogen nutrients from WWTP located in the watershed. As a result, the critical factor for the water pollution was evaluated to dissolved inorganic nitrogen and phosphorus nutrients. Particularly, SRP is a most important for the eutrophication. It suggest that may occur in the most urban streams of Korean peninsula. Therefore, because the necessity of water pollution management in the urban stream, inorganic N and P nutrients should be included as an essential component of water quality criteria in the advanced water quality project of Korean Government by enforcing of water quality assessment and total maximum daily loads (TMDLs).

Keywords

Acknowledgement

Supported by : 한국수자원공사

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