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J Korean Soc Environ Eng > Volume 37(9); 2015 > Article
J Korean Soc Environ Eng 2015;37(9): 517-525. doi: https://doi.org/10.4491/KSEE.2015.37.9.517
대전 갑천의 수질변화 경향 및 주요 수질 영향 인자 분석
이가영, 서동일
충남대학교 환경공학과
Analysis on Trends and Major Impact Factors of Water Quality Dynamics in the Gab-Cheon River, Daejeon, Korea
Gayoung Lee, Dongil Seo
Department of Environmental Engineering, Chungnam National University
Corresponding author  Dongil Seo ,Tel: 042-821-6679, Fax: 042-822-5610, Email: seodi@cnu.ac.kr
Received: September 16, 2015;  Revised: September 25, 2015;  Accepted: September 28, 2015.  Published online: September 30, 2015.
This study analyzes water quality change trends in three major rivers in Daejeon and effect of discharge from Daejeon Wastewater Treatment Plant between 1992 and 2014. As of 2014, COD concentration in the Gab-cheon-A station is in level VI for Korea river water quality standard while BOD and TP are in level III. As expansions of the treatment plant, water quality in the Gab-cheon River has been improving accordingly. However, during the study period, TN concentrations of the headwater and the most downstream locations of the Gab-cheon River have increased about twice and three times, respectively. It was estimated that the treatment plant is responsible for 35%. 46%, 76% and 63% of BOD, COD, TN and TP loadings of the Gab-cheon River, respectively. It was also estimated that small tributaries and nonpoint sources are responsible for 54% and 47% of BOD and COD loadings of the Gab-cheon River. Therefore, it is recommended to further reduce nutrient loadings from the treatment plant and also reduce surface runoff organic loading from nonpoint sources including small tributaries and storm sewers.
Key Words: Algal Bloom, The Geum River, The Gab-cheon River, Three Major Rivers in Daejeon, Daejeon Waste Water Treatment Plant, Pollutant Loadings
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