Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
권호 표지

Effects of Sewage Effluent on Organic Matters of Nakdong River: Comparison of Daily Loading

낙동강 수계 내 하수처리 방류수가 하류 하천 유기물에 미치는 영향: 부하량 비교

  • Seong, Jin-Uk (Department of Environmental Engineering, Kumoh National Institute of Technology) ;
  • Park, Je-Chul (Department of Environmental Engineering, Kumoh National Institute of Technology)
  • 성진욱 (금오공과대학교 환경공학과) ;
  • 박제철 (금오공과대학교 환경공학과)
  • Received : 2012.03.01
  • Accepted : 2012.05.31
  • Published : 2012.06.30
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Abstract

This study investigated the water quality of effluents from the wastewater treatment plants, located at the Gumi Complex 4, Gumi, and Wonpyong, in Gumi. DOC accounted for higher than 70% of TOC, and oxidation efficiencies, calculated from carbon, were 13~43% for BOD and 37~73% for CODMn, respectively. Based on the biological decomposition experiments, R-DOC account for higher than 70% of DOC, mostly being occupied by refractory organic matters. This indicated that the biodegradable organics occupied more proportions of organic loadings than the refractory organics. The effect of the organics from a discharge of a sewage treatment plant on rivers, Gumi industrial Complex 4, Gumi, and Wonpyong on lower streams of the Nakdong River were found to be 15%, 6% and 16% respectively. The ratio of 15% suggests that comparatively, no large portions of TOC loadings are occupied, but the problem is that the biodegradable organic matters occupy a lot more proportions than that of the refractory organic matters. Thus, it is highly estimated that the refractory organics can gradually increase the pollution level of organics and precursors of disinfection by-products to the down-stream water treatment plants.

본 연구는 하수처리장 방류수가 하천 유기물 오염에 미치는 영향을 파악하기 위하여 구미시 관내에 위치한 구미 4단지, 구미, 구미 원평하수처리장 방류수와 처리장 상 하류 하천을 조사하였다. TOC 중 DOC가 70% 이상으로 대부분 용존성으로 존재하였고, TOC에 대한 BOD, $COD_{Mn}$의 산화율은 각각 13~43%, 37~73%로 나타났다. 하지만 현재 사용되고 있는 BOD, $COD_{Mn}$이 총 유기탄소에서 차지하는 비율이 약 50% 이하로 나타나, 유기물을 대표하는 데 어려움이 있을 것으로 보이며, 향후 TOC로 지표를 전환하는 방향도 모색해 보아야 할 것으로 판단된다. DOC 분해실험 결과 DOC 중 R-DOC가 70% 이상으로 난분해성 유기물이 대부분을 차지하는 것으로 나타났다. 하수처리장 방류수의 유기물이 하천에 미치는 영향을 보면, 낙동강 하류에서 구미 4단지, 구미, 구미 원평하수처리장 방류수의 총 TOC 부하량이 차지하는 비율은 15%로 나타났다. 총 비율은 15%로 비교적 많은 부분을 차지하지는 않았지만 이 중 생분해성 유기물보다 난분해성 유기물이 더 많은 부분을 차지하는 것으로 나타나, 상수 처리 시 소독부산물의 전구물질이 증가하는 원인으로 작용할 수 있을 것으로 판단된다.

Keywords

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