惠阳城区降雨径流重金属污染特征研究：Ⅱ.重金属污染负荷估算

Research on the Polluting Characterization of Heavy Metals Caused by Urban Runoff in Huiyang District:Ⅱ.Calculation on the Polluting Loads of Heavy Metals

用0.5 mol/L HCl提取出来的重金属含量可以代表地表堆积物中能被降雨径流浸出的重金属污染物,模拟一次典型降雨在不同功能区所造成的降雨径流污染特征.结果表明,一次典型降雨径流中的重金属产生量:ρ(Pb)为0.143 mg/L,ρ(Zn)为0.206 mg/L,ρ(Cu)为0.087 mg/L,ρ(Cr)为0.040 mg/L.Pb的污染负荷总量达68.77 kg,Zn的污染负荷总量为88.50 kg,Cu的污染负荷总量为41.77 kg,Cr的污染负荷总量为20.37 kg.交通区产生的重金属负荷占总负荷的比例:Pb为78%,Zn为58%,Cu为76%,Cr为47%.降雨径流所致的重金属污染负荷已接近甚至超出了当地重点污染点源的重金属污染负荷.降雨径流将会对淡水河产生短期污染.

The content of heavy metals distilled by 0.5 mol/L HCl was taken as the content that could be lixiviated by storm-water runoff, and a simple model was used to simulate the course of storm-water runoff in different areas. Results showed that in the runoff of a typical rain, concentrations of heavy metals reached Pb 0. 143 mg/L, Zn 0.206 rag/L, Cu 0.087 mg/L, and Cr 0.040 mg/L. The total pollution load of Pb, Zn, Cu and Cr was respectively 68.77, 88.50, 41.77 and 20.37 kg. The ratios of heavy metal loads produced in the traffic area were Pb 78%, Zn 58%, Cu 76% and Cr 47% of the total areas. The loads of heavy metals produced in the runoff were close to and even more than those produced by point sources. The runoff would make a short-term pollution to the Danshui River.