镇江市城区降雨径流水质分析

Study on Quality of Runoff in Zhenjiang Urban Area

雨水径流污染是城市面源污染的主要形式,通过对镇江市城区2011年10场降雨径流水质监测,分析了镇江市城区降雨径流水质。结果表明,镇江市城区降雨径流存在一定污染,直接排入城市地表水体会对其造成污染。其主要污染指标为COD、BOD5、NH3-N、TP和总悬浮颗粒物,重金属含量较低,基本不存在重金属污染。各种不同类型雨水径流水质污染程度差异较大,天然降雨、屋面径流,大市口路面径流水质相对较好,基本能达到Ⅲ或Ⅳ类水体的水质标准;泵站、排口径流、河道径流污染较重,大多属于超Ⅴ类水体;南门大街路面径流污染最为严重,部分水质指标接近工业废水。

The urban runoff pollution is the main form of urban non-point pollution. The quality of runoff in Zhenjiang urban area has been studied, through monitoring water quality of ten times of urban rainfall in 2011. The results show that if discharged into surface water directly , the polluted rainfall runoff in Zhenjiang urban area will pollute it. The main pollution indexes are COD, BODs, NH3-N, TP and TSS. The contents of heavy metals are low, so there are no heavy metal pollution. There are great differences between the pollution degree of the rainfalls and the runoff at different underline surfaces. The water quality of natural rainfall, roof runoff and road runoff of Dashikou is relatively good, which belongs to the Ⅲ-Ⅳ type of the surface water quality. The runoff of the pump station, outlet of river and river channel is polluted seriously, which belongs to V type of the surface water quality. The road runoff with the most serious pollution is at Nanmen Street. Some water quality indexes are closed to industrial wastewater.