한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제37권1호
  • /
  • Pages.1-9
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  • 2021
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  • 2289-0971(pISSN)
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  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
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퇴적물 재부유에 따른 유기물과 중금속 용출 및 용존산소량 변화 특성에 대한 연구

A Study on the Releasing Characteristics of Organic Matter and Heavy Metals and Changes of Dissolved Oxygen Concentration during Sediment Resuspension

  • 강선경 (서울과학기술대학교 환경공학과) ;
  • 이한샘 (서울과학기술대학교 환경공학과) ;
  • 임병란 (서울과학기술대학교 환경공학과) ;
  • 이동석 (강원대학교 환경공학과) ;
  • 신현상 (서울과학기술대학교 환경공학과)
  • Kang, Seon Gyeong (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Lee, Han Saem (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Lim, Byung Ran (Department of Environmental Engineering, Seoul National University of Science and Technology) ;
  • Rhee, Dong Seok (Department of Environmental Engineering, Kangwon National University) ;
  • Shin, Hyun Sang (Department of Environmental Engineering, Seoul National University of Science and Technology)
  • 투고 : 2020.10.17
  • 심사 : 2020.12.28
  • 발행 : 2021.01.30
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초록

The depletion of dissolved oxygen (DO) in urban streams has a profound effect on the aquatic ecosystem; however, the change in DO by resuspension of sediments and the cause have not been sufficiently investigated. In this study, the physicochemical properties (particle size, and the content of organic and heavy metals) of the sediments of an urban stream (Anyang Stream) and the characteristics of water quality changes (DO, dissolved organic carbon (DOC), dissolved nitrogen (DN), sediment oxygen demand (SOD), and adenosine triphosphate (ATP)) by sediment resuspension were investigated. The sediment content of fine particles (< 0.2 mm) increased from 36.7% to 52.7% from the upstream to the downstream, and the contents of heavy metals and organic matter of the sediment were also higher towards the downstream. The depletion of DO by resuspension was observed in the sediment at the downstream sites (P8, P9), where the fine particle content was high, and biological SOD (BSOD) was more than 88% compared to the total SOD. The increase in BSOD coincided with the increase in ATP. It was also confirmed that the depletion of DO could increase the amount of heavy metals (such as Fe, Mn, and Pb) released from the sediment. Based on the above results, it can be concluded that resuspension of sediments induces rapid water quality changes and may cause accidents, such as fish mortality, during rainfall, and such a water quality effect can be more pronounced in sediments with a high content of fine particles and organic matter and high biological activity.

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참고문헌

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