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Effect of Municipal Sewage Treatment Plant on Water Quality in Western Kangwon Area

The effects of municipal sewage treatment plants on the water quality and effluent loading were investigated. BOD removal rates from Wonju, Hoengseong, and Hongcheon municipal sewage treatment plants were 88.9%, 80.6%, 90.7% and T-P removal rates were 47.3%, 56.5%, 71.6%, respectively. Also, BOD effluent loading from WonJu, Hoengseong, and Hongcheon treatment plants were 1,520 kg/day, 75 kg/day, 55 kg/day and T-P effluent loading were 203.9 kg/day, 4.2 kg/day, 4.0 kg/day, respectively. In terms of water quality distribution by distance of flow, BOD of the Seom river rapidly rose from 1.6mg/l to 4.0mg/l and T-P rose from 0.034mg/l to 0.321mg/l. Also BOD of the Hongcheon river showed a slowly rise from 1.1mg/l to 1.4mg/l and T-P from 0.011mg/l to 0.026mg/l. In conclusion, the effects of municipal sewage treatment plants on the water quality proved that T-P was higher than BOD. Consequently, in order to improve water quality, it is necessary to adopt an advanced sewage treatment system like nutrient removal.