Branch rivers of Han-river contribute significantly to the pollution and eutrophication that have caused drastic changes to the ecosystem of Han-river. In Tanchun, two sewage treatment plants have been operated and their drain water have significantly affected Tanchun water quality. Here we investigate on the pollution change of Tanchun that has affected Han-river. The results were as follows : 1. Attribution to elevate water pollution concentrations of Han-river by Tanchun were T-P, BOD, T-N, COD in orders. 2. The highest loading pollutant in Han-river by Tanchun rated about 2 times by T-P. 3. In the downstream of Tanchun was low self-purification than upstream. 4. The most affected Tanchun water quality was Tanchun treatment plant in the downstream of Tanchun.
I. 序論
II. 調査 對象 및 方法
III. 결과 및 고찰
IV. 結論