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The Assessment on the Effect of Discharge and Variation of Water Quality from the Sewage Treatment Plants in Seoul  

Kwak Mi-Ae (Seoul Metropolitan Government Research Institute of Public Health and Environment)
Jung Jong-Heub (Seoul Metropolitan Government Research Institute of Public Health and Environment)
Eo Soo-Mi (Seoul Metropolitan Government Research Institute of Public Health and Environment)
Lee Hong-Keun (Department of Environmental Health, Graduate School of Public Health, Seoul National University)
Publication Information
Journal of environmental and Sanitary engineering / v.19, no.3, 2004 , pp. 1-12 More about this Journal
Abstract
This study was conducted to evaluate the variation characteristics of influent and effluent quality from sewage treatment facilities using activated sludge processes and to assess the impact caused by discharge of treated sewage on the receiving water Monthly data of five water quality items (BOD, COD, SS, T-N, T-P) were used to understand the water quality at three sewage treatment plants in Seoul for five years from 1999 to 2003. Concentration differences of water quality parameters were observed between upstream and downstream site at the sewage treatment plant outfall to investigate the impact of discharge in Tan stream and Han river basin. 1. Due to the effect of continuous improvement in sewer system, the concentrations of influent went on increasing generally. 2. Effluent concentrations of BOD, COD and SS showed the trend of a little decreasing, but the trend of increasing in T-N and T-P. 3. In Tan stream basin, the impact of sewage treatment plant discharge was not observed directly, because concentration of discharge was lower than stream water's. But discharges from sewage treatment plants affected water quality at downstream site in Han river, concentration of T-P especially.
Keywords
water quality; sewage treatment plant; discharge; impact;
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