扬州市不同类型城市绿地径流污染特性

为研究不同类型的城市绿地径流污染特征,以扬州市为研究区域,选取了公园绿地、小区绿地、工业区绿地、文教区绿地和道路绿地等五种不同类型的城市绿地,采集径流雨水水样并测试其中典型污染物的浓度。结果表明:不同类型城市绿地径流雨水均存在水质污染情况,其中道路绿地、工业区绿地污染严重,公园绿地、小区绿地次之,文教区绿地污染程度最低;城市绿地初始冲刷效应不强烈,大部分污染物呈现中等程度的初期冲刷效应;不同类型城市绿地污染物的赋存状态不同,其中TN(总氮)、Zn、Pb主要以颗粒态存在,COD(化学需氧量)、TP(总磷)主要以溶解态存在。

Study on Runoff Pollution Characteristics of Different Types of Urban Green in Yangzhou

Yangzhou was selected as the research area in order to study the characteristics of runoff pollution in different types of urban green. Five different types of urban green such as park green, residential green, industrial green, cultural and educational green and road green were selected to collect runoff rainwater samples to test the concentration of typical pollutants.The results show that water pollution exists in runoff of different types of urban green, among which road green and industrial green are seriously polluted, park green and residential green are next, cultural and educational green is the least polluted. First flush effect of urban green is not strong, most pollutants present moderate first flush effect. The occurrence of pollutants in different types of urban green is different. Among them, TN, Zn and Pb mainly exist in granular state, while COD and TP mainly exist in dissolved state.