苏州城区路面降雨径流污染特征分析研究

通过对苏州典型商住区和文教区路面径流水质的采样分析探讨了道路降雨径流的污染特征.结果显示不同功能区径流水质差异较大,商住区各污染物浓度均高于文教区.径流污染物浓度一般在降雨初期较高,往后逐渐下降并趋于平稳.SS和COD、Pb等都有较强的相关性.各污染物的初期效应明显,商住区初始冲刷效应较强;重金属物质的冲刷强度要大于其他污染物.降雨强度是影响初始冲刷效应的主要因素,强度较大的降雨初期冲刷效应明显.

Study on Pollution Characteristics of Urban Roadway Runoff in Suzhou City

Water samples from two different functional districts were collected in Suzhou City. The study analyzed the time varying regularity, the first flush effect and the correlation between SS and other pollutants. The results showed that the main pol- lutants in the road runoff are COD, SS, NH4 - N and the heavy metals. The pollutants in commercial district are higher than those of institutes and colleges district. The concentrations of pollutants were higher at the initial stage while decreased with the time and tend to be stable. The degree of correlation between SS and the other pollutants is COD 〉 Pb 〉 TP 〉 Cr 〉 Cu 〉 NH4＋ - N. The first flush effect of all concentrations is obvious and it is stronger in commercial district. The first flush effect of the heavy metals is more obvious than the other pollutants and the rainfall intensity is the main influencing factor. The heavier the rainfall is, the more obvious the first flush effect will be.