earticle

영어

The pollutant load discharged in Dongbok lake watershed was estimated as BOD 893.4 kg/day, TN 729.3 kg/day and TP 55.9 kg/day in 2017 year. The largest amount of the load was the livestock and land-based pollutants, but the domestic wastewater-based amount also accounted for 12.4%, most of which were originated from the non-treated sewage in the living system. The number of public sewage treatment facilities installed to Dongbok lake watershed was 34, and the average removal efficiency of pollutant by them was BOD 90.6%, T-N 53.9% and T-P 58.7%. As a result, the load discharged from the facilities accounted for 1.0% of BOD, 13.2% of T-N and 12.3% of T-P in the total amount discharged from point sources. Meanwhile, 7 artificial wetland facilities for non-point pollutant treatment were installed and operated in the watershed. The average removal efficiency of the wetland during rainfall was BOD 2.8%, COD -14.9%, SS 71.7%, T-N 42.5%, and T-P 22.1%, but the contribution rate of water quality improvement during normal (non-rainy) day by these facilities was very low: BOD -1.5%, T-N 3.0%, and T-P 0.4%.

한국어

동복호 유역의 오염 배출부하량은 2017년 기준으로 BOD 893.4 kg/일, T-N 729.3 kg/일, T-P 55.9 kg/일로 산정되었다. 오염원별로는 토지계와 축산계가 가장 많은 양을 차지하였으나, 생활계 점오염원이 차지하는 비율도 BOD 기준으로 12.4%였고 이는 거의 대부분이 하수미처리구역에서 발생하는 것으로 나타났다. 동복호 유역에 설치·운영 중인 공공하수 처리시설은 34개소가 있으며, 이들에 의한 수질오염물질 처리효율은 BOD 90.6%, T-N 53.9%, T-P 58.7%로 나타났고 이 에 따라 공공하수처리시설들을 거쳐 방류되는 오염부하량은 총 점배출부하량 중에서 BOD 1.0%, T-N 13.2%, T-P 12.3% 를 차지하고 있다. 한편, 동복호 유역에는 총 7개소의 비점오염저감시설(인공습지)이 있으며, 강우시 인공습지 평균 제거 효율은 BOD 2.8%, COD -14.9%, SS 71.7%, T-N 42.5%, T-P 22.1%로 나타났으며, 이 시설의 설치·운영에 따른 평상시 (비강우시)의 수질개선 기여율은 BOD -1.5%, T-N 3.0%, T-P 0.4%로 매우 낮은 것으로 나타났다.