Estimation of Basic Unit Pollution Load of an Urban Area in the Lake Biwa Basin

K. Wada, H. Tsuno, N. Takei
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Abstract

From field surveys of roof runoff conducted in general residential houses in the Lake Biwa basin, the pollution loads of buildings in an urban area were evaluated. The samples were collected from the total roof drainage during a rainfall event, and the water pollutants investigated were total organic carbon ( TOC ) , total nitrogen ( TN ) , and total phosphorus ( TP ) . As a result, it was estimated that 67.7% of the total precipitation flowed out as roof wastewater, and it was clarified that the proportion of dissolved components was high in all cases. The calculated loads of TOC, TN, and TP from buildings were 60.4, 18.1, and 0.64 g ha -1 day -1 , respectively. By applying these loads and roadway loads in the Lake Biwa basin, the basic unit pollution loads of TOC, TN, and TP in the urban area of the Lake Biwa basin were estimated to be 140, 24.2, and 1.1 g ha -1 day -1 , respectively.
琵琶湖流域城市区域基本单位污染负荷估算
通过对琵琶湖流域普通住宅屋顶径流的实地调查,评价了城区建筑物的污染负荷。样品采集于某次降雨过程中屋面总排水中,水污染物主要为总有机碳(TOC)、总氮(TN)和总磷(TP)。结果表明,总降水中有67.7%以顶板废水的形式流出,并且在所有情况下,溶解成分的比例都很高。建筑物TOC、TN和TP的计算负荷分别为60.4、18.1和0.64 g ha -1 day -1。在琵琶湖流域应用这些荷载和道路荷载,估算出琵琶湖流域城区TOC、TN和TP的基本单位污染荷载分别为140、24.2和1.1 g ha -1 day -1。
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