路面清扫控制径流重金属污染研究

Research on Road Sweepers Treating Runoff Heavy Metals Pollution

以长深高速滨州段作为研究对象，分析路面径流中重金属浓度变化规律，结合现场清扫实验结果预测路面清扫对径流重金属的控制效果。研究发现路面降雨径流形成初期，径流中重金属浓度即达到了峰值，该次降雨事件初期冲刷效应显著，其中Zn超过Ⅲ类水质标准值，Pb超过V类水质标准值，两种重金属污染严重；降雨径流中溶解态Cu、Pb、Zn的浓度占各自总浓度的比例分别为33．2％、10％和36％；降雨径流对粒径小于63μm和介于63～125μm之间颗粒物的冲刷作用显著，冲刷率分别为70％和45％。清扫车对不同粒径颗粒物的去除率由37．82％增加到98．33％，总去除率为86．07％。预测结果表明清扫车对溶解态Cu、Pb、Zn的去除率分别为64．76％、62．90％和58．51％。

Based on the study results of Changshen highway in Binzhou, the discharge rules of heav,. metals in road runoff were discussed, and the performance of street sweepers for treating dissolved heav,. metals was predicted on the basis of this study. The results indicated that the concentrations of heavy met als reached peaks in the initial road runoff, which exhibited a pronounced first flush in this rainfall event. Concentrations of Zn and Pb exceeded class HI and V of water quality standards, respectively, the pollu- tion extent of Zn and Pb are seriously. The ratio of dissolved Cu, Pb and Zn were 33.2e//00, 20% and 36~, respectively. Road runoff scoured 70% particles smaller than 63μm and 45% particles ranged from 63 tc 125μm. The removal efficiency of road sweepers on long-term build-up particles of different size increased from 37.82%to 98. 330%, with total removal efficiency 86.07%. The result calculated by formula of dis- solved metals reduce volume indicatesd that the removal efficiency for dissolved Cu, Pb and Zn were 64. 76%, 62.90% and 58.51%