Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Assessment of Fecal Pollution and Bacterial Community Structure in Restored Section of Cheonggyecheon Stream

청계천 복원구간 내 분변오염도 평가와 미생물 군집 연구

  • Park, Youngbin (Department of Environmental Health, School of Public Health, Seoul National University) ;
  • Lee, Heetae (Department of Environmental Health, School of Public Health, Seoul National University) ;
  • Kim, Seiyoon (Department of Environmental Health, School of Public Health, Seoul National University) ;
  • Ko, GwangPyo (Department of Environmental Health, School of Public Health, Seoul National University)
  • 박영빈 (서울대학교 보건대학원 환경보건학과) ;
  • 이희태 (서울대학교 보건대학원 환경보건학과) ;
  • 김세윤 (서울대학교 보건대학원 환경보건학과) ;
  • 고광표 (서울대학교 보건대학원 환경보건학과)
  • Received : 2008.06.17
  • Accepted : 2008.11.10
  • Published : 2009.01.30
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Abstract

In 2005, the 5.84-Km length of Cheonggyecheon stream, previously covered with concrete road, was uncovered in the middle of Seoul, Korea. We investigated microbial water quality in various sites in Cheonggyecheon stream. We took water samples on three different days. The sampling sites included inflow water from upper stream (Mojeongyo), midstream (Ogansugyo), and downstream (Muhakgyo). Fecal pollution indicator microorganisms were measured by both IDEXX $Colilert^{(R)}$ and $Enterolert^{(R)}$. Microbial community from these sampling sites was also characterized based on 16S rRNA gene sequences. The average concentrations of total coliform are 5 CFU/100 mL, 1474 CFU/100 mL, and 1776 CFU/100 mL at Mojeongyo, Ogansugyo, and Muhakgyo, respectively. The average concentrations of fecal coliform were 28 CFU/100 mL, 47 CFU/100 mL in Ogansugyo, and Muhakgyo, respectively. The concentrations of other fecal indicator microorganisms including E. coli and Enterococcus sp. increased in downstream. When we characterized the microbial community, unique microbial community were discovered at different sampling sites. This study suggests that Cheonggyechoen stream is likely affected by non-point fecal sources and has unique microbial environment as the river flows downstream.

Keywords

Acknowledgement

Supported by : 환경부

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