广州市城区降雨径流水质特征分析

Study on Quality Characterization of Runoff in Guangzhou Urban Area

通过对广州市城区2008年-2009年大量的降雨径流水质监测,研究了广州市城区降雨径流水质的特征。结果表明,广州城区地表径流水质的未达到污水排放的二级标准,若直接排入城市地表水体可能对其造成污染,因此,对待城市地表径流水应该如对待污水一样处理。对于CODcr、BOD5、TN、TP浓度,路面径流要高于屋顶径流;而对于SS浓度,屋顶径流高于路面径流。总磷TP的颗粒吸附态的污染物对总污染物的贡献最大,对于路面径流高达80.1%,对于屋顶径流为68.6%;其次是CODcr和BOD5,TN颗粒吸附态比重最低,通过沉积或过滤去除城市地表径流中的悬浮颗粒物,可以大大减少污染物的含量。降雨径流中的污染物浓度远高于同期河涌水体中的污染物浓度(除TN外),降雨径流对河涌水中污染物输入的贡献占有相当的份额。

In this research, we studied the characterization of runoff pollution during 2008 - 2009 in Guangzhou urban area through measuring water quality, of urban runoff. Results showed that ff going into any surface water, urban runoff of Guangzhou would pollute it. And most indexes of water quality of urban runoff could not reached second - level standard of integrated wastewater discharge. Concentrations of TN, TP, CODcr , BOD5 of street runoff were higher than that of roof runoff and concentrations of SS of street runoff were lower than that of roof runoff. Percentage of TP linked to particles was the largest, which in street runoff was 80. 1%, and which in roof runoff was 68.6%. Percentage of CODcr and BOD5 linked to particles was the second large, and percentage of TN linked to particles was lower relatively. Suspended solids removal, through settling or filtration, would cause an important reduction of pollutants loads in all types of runoff. Pollution concentration of urban runoff was far higher than that of urban river except TN, pollution of urban runoff taken up sizeable in that of carrying to urban river.