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A Study on Impact of Public Sewage Treatment Works Affecting Water Qualities of the Lake Uiam in Chuncheon City

Dong-Hwan Jeong 1,  Cho Yang Seok 1,  최인철 1,  안경희 1,  Hyen-Mi Chung 1,  권오상 1

1국립환경과학원

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ABSTRACT

When abnormal taste and odor were detected in the tap water of the North-Han riverwatershed during the dry season in late 2011, excessive nutrients with algal growth in the LakeUiam and weather factors were considered to be among its causes. The nutrients, in particular,originated from domestic sewage in the Chuncheon area. This study was conducted to investigaterelations between the algal growth in the Lake Uiam and the contribution of nutrients from publicsewage treatment works (PSTWs) in Chuncheon city, and based on this to analyze the environmentalimpact. Nutrients in the Lake Uiam have already been accumulated to the level of eutrophication. Even in winter, the conditions in the lake such as retention time and water temperature were favorable to boost algal growth. After phosphorus treatment processes were introduced, the PSTWs in the Lake Uiam watershed were able to reduce the total phosphorus loads by 43%. The algal concentrations in the Lake Uiam also dropped by about 7%. The nitrogen treatment efficiencies in the PSTWs, on the other hand, remained almost the same after the introduction of the phosphorus treatment processes. To solve these problems more efficiently, it is necessary to develop management strategies for the upstream area of the Lake Uiam and set plans to improve nitrogen treatment operation and management for the PSTWs in Chuncheon.

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