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금강수계 유기물질 분포 및 거동 특성 연구

Study on the Distribution and Behavior Characteristics of Organic Matter in the Geum River Basin

최혜선|김상욱|태은아|박찬홍|민중혁
한국습지학회 (Korean Wetlands Society)|2024.11|한국습지학회지 (Journal of Wetlands Researh)|제26권 제4호|pp. 435-447|DOI 10.17663/JWR.2024.26.4.435

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Geum RiverOxidation rateTotal organic carbon (TOC)Organic matters총유기탄소유기물질금강수계산화율
주제분류기타자연과학

초록

수질오염의 주요 원인물질인 유기물은 수중 농도가 높아지면 미생물 증식이 촉진되어, 이로인해 용존산소량 감소에따라 수질이 악화된다. 본 연구에서는 최근 10년간(2013~2022년) 금강수계의 상류지점(BG)에서 하류지점(YH)까지 지점별 수질 특성과 유기물의 시·공간적 변화를 조사하였다. 금강수계의 평균 BOD/TOC 비율이 0.64로 난분해성 유기물이 많은 비율을 차지하며, COD/TOC 비율이 높은 구간에서는 농업 및 생활 오염원에 의해 난분해성유기물이 축적되는 것으로 나타났다. 생활하수 및 농업 활동에 의한 유기물 부하 증가로 BOD와 COD 산화율은하류로 갈수록 증가하였다. DOC와 POC 비율 분석 결과, DOC는 평균 88.4%, POC는 11.6%의 기여율을 보였으며, TOC와 BOD 간의 상관관계는 지점별로 0.418~0.674(p<0.01)로 양의 상관성을 나타냈다. 본 연구는 TOC가하천수 수질 기준에서 COD를 대체할 수 있는 유기물 지표로 적용 가능함을 시사하며, 기존 유기물 지표와의 연계성 분석 및 오염도 예측을 통해 유역 오염원 관리 대책 마련에 기여할 수 있을 것으로 판단된다.

Abstract

Organic matter, a major pollutant in water pollution, promotes microbial growth when its concentration increases, subsequently reducing dissolved oxygen levels and deteriorating water quality. This study investigated the spatiotemporal variations and water quality characteristics of organic matter across the Geum River basin from upstream (BG) to downstream (YH) over the past decade (2013–2022). The average BOD/TOC ratio of the Geum River basin was 0.64, indicating a predominance of recalcitrant organic matter. Sections with high COD/TOC ratios were associated with the accumulation of recalcitrant organic matter due to agricultural and domestic pollution sources. The oxidation rates of BOD and COD increased downstream, correlating with organic matter loads from domestic sewage and agricultural activities. Analysis of DOC and POC contributions revealed an average composition of 88.4% DOC and 11.6% POC. The correlation between TOC and BOD across monitoring sites ranged from 0.418 to 0.674 (p<0.01), demonstrating a positive relationship. This study suggests that TOC could serve as a substitute for COD as an organic matter indicator in river water quality standards. Furthermore, linking TOC with existing organic matter indicators and predicting pollution levels may support the development of effective watershed pollution management strategies.

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하천수와 하수처리장 방류수의 유기물 분포 및 분해특성강영주, 김성준, 김승호, 민경우, 백계진, 서광엽, 서희정, 이경석한국분석과학회 · 분석과학2010 · 제23권 제1호영산강 수계 TOC, COD/BOD 특성박종수, 안길원, 양수인, 오은하, 이해훈, 임항선한국환경분석학회 · 환경분석과 독성보건2015 · 제18권 제1호금강수계 소유역내 수질 변화 분석-소하천을 대상으로-김동호, 이영준, 이준배, 한아원, 홍선화, 황순홍한국환경농학회 · 한국환경농학회지2012 · 제31권 제4호물환경에서의 유기물질 지표 특성 및 효율적 이용방안-낙동강수계 호소수를 대상으로-강미아한국습지학회 · 한국습지학회지2014 · 제16권 제1호지표수 수질관리를 위한 적정 유기물질지표 선정최지용, 한대호한국환경연구원 · 환경정책연구2011 · 제10권 제4호유기물 수질지표로서 TOC 환경기준 설정에 관한 연구최지용, 한대호서울연구원 · 서울도시연구2011 · 제12권 제3호

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