天津市降雨径流污染状况研究

Research on Pollution Characteristics of Rainfall Runoff in Tianjin City

将天津市分为商业区、工业区、居民区和文教区4个功能区,连续3年对不同区域内的路面、屋面及受纳水体水质进行监测。结果表明:天津市降雨径流中主要超标指标为TOC、SS、COD、BOD5、NH3-N、TN、BOD5、Cr6+、TOC、Cd和挥发酚,工业区和商业区污染最为严重;对于屋面径流水质污染程度为:油毡﹥沥青﹥瓦面;初期雨水径流污染严重,SS分别与COD、BOD5、TP、TN具有良好的线性相关性,去除雨水径流中的SS可显著降低其他污染指标浓度;受纳水体水质受降雨径流影响严重,降雨后水体中COD、BOD5、TN、NH3-N、Cd、Cr6+、LAS浓度超过Ⅴ类地表水标准限值。

Tianjin was divided into four functional areas, including commercial, industrial, resi- dential and cultural areas. The water quality of pavement runoff, roof runoff and receiving water bodies in different areas was monitored for three years. The results showed that the main indexes that exceeded the limits in the rainfall runoff were TOC, SS, COD, BODs, NH3 - N, TN, BODs, Cr6 ＋ , TOG, Cd and volatile phenol. Industrial and commercial areas were polluted most seriously. The pollution degree order of roof runoff was： asphalt linoleum 〉 asphalt 〉 tile. The initial rainwater runoff had the most serious water bodies was affected by rainfall runoff seriously. The concentrations of COD, BOD5, TN, NH3 - N, Cd, Cr6＋ and LAS in the receiving water bodies exceeded the limits of class V specified in the surface water quality standards after rainfall.