Water Quality Correlation Analysis between Sewage Treated Water and the Adjacent Downstream Water in Nakdong River Basin

낙동강유역의 하수처리장 방류수와 인접 하류하천의 수질상관관계 분석

  • Cho, Hyun Kyung (Graduate School, Gyeongsang National Univ.) ;
  • Kim, Sang Min (Dept. of Agricultural Engineering (Insti. of Agric. and Life Sci.), Gyeongsang National Univ.)
  • 조현경 (경상대학교 대학원 농공학과) ;
  • 김상민 (경상대학교 지역환경기반공학과, 경상대학교 농업생명과학연구원)
  • Received : 2018.01.30
  • Accepted : 2018.03.21
  • Published : 2018.03.30


The purpose of this study was to analyze the correlation between the effluent of a sewage treatment plant (STP) and the adjacent stream located downstream of the STP in Nakdong River. Flow and water quality data, such as BOD, COD, SS, T-N, and T-P data, for 12 STPs and adjacent downstream monitoring stations in the main stream and tributaries of Nakdong River were collected from 2012 to 2015. As a result of correlation analysis between river flow and water quality at the river water quality measurement point, COD, SS, and T-P were correlated positively with the river flow rate at 6, 8, and 6 points, respectively. As a result of analyzing the water quality of sewage treatment plant effluents and downstream streams, BOD and COD were correlated at 2 and 3 points, respectively. T-N showed a positive correlation at 9 points, and 7 of them had a strong positive correlation, indicating that sewage treatment effluent had a large effect on downstream streams. In this study, we found that the correlation between the river flow rate and the water quality factors (COD, SS, TP) was high at river water measurement points, and the sewage treatment plant effluent was correlated with the T-N value of adjacent streams.



Supported by : 한국연구재단


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