Journal of Environmental Science International (한국환경과학회지)

The Korean Environmental Sciences Society (한국환경과학회)
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Analyses of TOC Efficiency and Correlation between DO, BOD, COD and Influence Factors using Long-term Observation Data in the Main Stream of Nakdong River

낙동강 본류에서 장기관측 자료를 이용한 DO, BOD, COD와 그 영향인자의 상관관계 및 TOC 분해율

  • Kang, Dong-hwan (Environmental Research Institute, Pukyong National University) ;
  • So, Yoon Hwan (Environmental Research Institute, Pukyong National University) ;
  • Park, Kyeong-deok (Interdisciplinary Program of Marine Convergence Design, Pukyong National University) ;
  • Kim, Il-kyu (Department of Environmental Engineering, Pukyong National University) ;
  • Kim, Byung-Woo (K-water Research Institute, Korea Water Resources Corporation)
  • 강동환 (부경대학교 환경연구소) ;
  • 소윤환 (부경대학교 환경연구소) ;
  • 박경덕 (부경대학교 마린융합디자인협동과정) ;
  • 김일규 (부경대학교 환경공학과) ;
  • 김병우 (한국수자원공사 K-water연구원)
  • Received : 2019.01.18
  • Accepted : 2019.04.10
  • Published : 2019.05.31
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Abstract

Herein, we analyzed the spatial and temporal variation of DO (dissolved oxygen), BOD (biochemical oxygen demand), and COD (Chemical Oxygen Demand) with the monthly mean observed data for 10 years (2008~2017) in the main stream of the Nakdong River. The water quality of the stations declined in a downstream direction, with the BOD and COD showing their highest values at the ST5 station. From the analysis of the correlation of water quality components at 10 stations, the correlation coefficient between the DO and water temperature was more than -0.90, and that between BOD and Chl-a was 0.48~0.85, and that between COD and TOC was more than 0.65 except for the ST5 and ST10 stations. From the regression analysis using data collected from all stations, the water temperature and DO decreased linearly with a coefficient of determination of 0.90, and the Chl-a and BOD could be described by increasing power functions with a coefficient of determination of 0.83. The TOC and COD followed increasing logarithm functions with a coefficient of determination of 0.58. The TOC efficiency at the 10 stations was estimated and the average efficiencies of BOD and COD were 15.5~36.3% and 57.4~89.6%, respectively.

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References

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