苏州市工业用地地表径流污染特性研究

Study on the pollution characteristics of surface runoff in Fengqiao Industry Park of Suzhou

对苏州新区枫桥工业园湘江路段的10场有效降雨事件的地表径流污染特性进行了研究。研究表明,地表径流水质参数COD、SS、NH3-N、TN、TP均服从对数正态分布,在95%置信水平下,SS与COD、TP、TN之间存在线性相关性(R=0.45～0.72)。统计了污染物事件平均浓度(EMC),COD、SS、NH3-N、TN、TP的EMC中值分别为213、491、2.65、5.19、1.07mg/L,相对应的单位面积污染物负荷分别为1898、4375、24、46、10kg/(hm2.a)。与韩国Chongju工业区和上海市相比,SS负荷高是苏州新区枫桥工业园地表径流水质的主要特点,削减SS负荷对控制其非点源污染具有重要意义。

Based on the monitoring data of ten rainfall events in Xiangjiang Road （Fengqiao Industry Park of Suzhou）, the pollution characteristics of surface runoff in the park were studied. Results showed that the pollutants parameters （COD, SS, NH3-N, TN, TP） were lognormal distributed, and there were significant correlations between SS and COD, TN, TP at P〈0.05（R=0.45-0.72）. The median values of Event Mean Concentrations （EMC） of COD, SS, NH3-N, TN and TP were 213, 491, 2.65, 5. 19 and 1.07 mg/L, which corresponding the pollutant loads of 1 898, 4 375, 24, 46 and 10 kg/（hm2 ·a）. Compared to other industry parks with similar rainfall, SS pollutant load in the park was higher than that of other industry parks, which means the SS pollution was the main character of the park, and the reduction of SS load was probably an effective way for the non-point source pollution control.