温州市不同功能区地表径流污染特征研究

以温州市城区为例,在多雨季节对商业区、工业区、居民区、交通路面、绿地等五大功能区的降雨径流水质进行了6次采样监测,发现不同功能区地表径流水质差异较大。前10 min初期径流中各功能区COD、TN;商业区和工业区的NH4+-N;商业区、交通路面和工业区TP的平均浓度均劣于地表水V类水质标准。随着降雨历时的延长,降雨径流中主要污染物浓度逐渐下降,并在30~45 min趋于稳定。对COD而言,由商业区造成的径流年污染负荷最高,达5 763.15 t/a;对SS而言,温州市几个重要工业经济开发区所造成的径流年污染负荷最为严重,达到15 883.67 t/a,居民区次之,达11 804.81 t/a;对NH4+-N而言,由工业区、商业区和居民区所造成的径流污染相对较重,分别在50 t/a左右。地表径流对温瑞塘河的COD贡献较大,达22.88%;而由地表径流所引起的NH4+-N和TP污染对温瑞塘河的污染贡献较小。

Study on the Polluted Characteristics of the Surface Runoff in the Different Functional Districts of Wenzhou

The samples of surface runoff were collected for six times from five different functional districts,i.e.commercial,industrial,residential,communication and green area districts in Wenzhou City during rainy season.The results showed that water quality of surface runoff differs greatly in different districts.The average concentrations of COD,TN in each district,NH4+-N in commercial and industrial districts,and TP in commercial,industrial and communication districts during the first 10 min runoff were below grade V of surface water environment standard.In addition,the concentrations of pollutants in runoff descend gradually with the time elapse and tend to be stable in 30~45 min.Among the five functional districts,the commercial district possesses the highest COD burden(5 763.15 t/a) per year;the several industrial developing districts own the highest SS burden(15 883.67 t/a) per year;the industrial,commercial and residential districts had the relatively serious NH4+-N burden(ca.50 t/a).The COD contribution rate by surface runoff reaches up to 22.88% to Wenruitang River,while the less contribution rates was observed for NH4+-N and TP pollution.