남한강 북쪽 유역 하수종말처리장의 24시간별 수질 변화 분석

Abstract

Three sewage treatment plants in south Han river basin were selected for time depending water quality monitoring. The water qualities of influents and effluents were determined depend on time. The quantity of waste water and pollution load was also estimated by field measurement. These treatment plants were located in Yangpyung, Yongmoon and Wonju. Sampling was executed every 2-3 hours on a particular date between late May to late November 2002. Two samples - influent and effluent - were collected for each sewage plant for later consideration of treatment efficiency. An inspection of BOD and COD data revealed that the influents of Daesin (Yeoju area) sewage treatment plant is relatively polluted but yangpyung treatment plants indrafted moderately polluted water. The BOD values of these two sewage plants' effluents turned out to be quite low of under 5 mg/L. The influent and effluent BOD value of Wonju sewage treatment plant showed around 70 and 20 mg/L, respectively. According to these data, the efficiency of Wonju sewage treatment plant can be considered unsatisfactory and may need more improvements. The efficiencies of T-N and T-P treatment of all three sewage treatment plant turned out to be quite low. Notwithstanding the low efficiency level, the low T-N and T-P concentration of influents decline the meaning of the T-N and T-P efficiency values. However, the T-P concentration of Wonju sewage treatment plant effluent was over 2 mg/L (regulation criterion) and it is thus reasonable to consider an installation of additional phosphorous treatment system.