无锡市校园降雨径流污染特性分析

选择无锡江南大学校园区作为研究对象,对其天然降雨及不同下垫面的3个观测点进行了监测取样。结果分析表明,随着降雨历时的延长,各污染物浓度总体呈下降趋势,但变化过程随着降雨特性的不同而不同。雨强均匀,水质波动较小;雨强较大,除NH+4-N外,其余污染物变化均较大。不同下垫面地表径流污染程度不同,整体水质呈弱碱性,路面TP、COD和SS最高,分别达到0.216 mg/L、170 mg/L和710 mg/L;而草坪中的TN和NH+4-N含量最高达7.5 mg/L、0.5 mg/L左右。同时,不同的污染物在不同季节呈现不同的污染特征。整体污染比较严重。

Study on the characteristics of pollution in precipitation runoff in wuxi university

Jiangnan University was selected as the research area,and samples were obtained from three different underlying surfaces. The research result indicates that the concentration of pollutants reduced with the rainfall duration,the changing process varied with characteristics of the rainfall. When the rainfall intensity was uniform,the runoff quality was less volatile; when it was great,the changes of water quality were larger,except NH＋4-N. The runoff quality was different on different underlying surfaces and showed a weak alkaline on the whole. The concentration of TP（ 0. 216 mg /L）,COD（ 170 mg /L） and SS（ 710 mg /L）were higher on the road than any other underlying surfaces. The concentration of TN（ 7. 5 mg /L） and NH＋4-N（ 0. 5 mg /L） showed an enrichment in the grassland. Furthermore,the pollutions in the runoff of Wuxi City was relatively serious and changed with the seasons.