海绵城市生物渗滤单元填料对城市道路径流污染物处理效果的实验研究

Experimental Study on Effect of Bio-percolation Unit Paddings of Sponge City on Treatment of Runoff Pollutant of Urban Road L

摘要:

通过对海绵城市生物渗滤单元几种常见的填料及其在不同配比下对于城市道路径流中的Zn、总P和石油类三种代表性污染物处理效果的实验分析，考察了不同填料对城市道路径流污染物的去除效果。结果表明，河砂的去除效果好于沸石。实验期间，河砂柱对锌的去除率均高于95%， 而沸石柱在通水的前三天内对锌的去除率高于90%，随后逐渐降低。在河砂中适当添加少量砾石有助于在保证去除率的情况下提高其渗透速率， 当河砂与砾石质量比为2∶1时，填充柱的渗透速率达到4 mm/min，同时其对各污染物的去除效果也很明显。

Abstract:

According to the experimental analysis of the effects of several common paddings of bio-percolation unit of sponge city under the different proportions to treat three representative pollutants of Zn, Total P and petroleum in the urban road runoff, the removal effects of the different paddings on the runoff pollutants of urban road are investigated. The result shows that the removal effect of river sand is better than zeolum. During the experiment, the removal rate of zinc by river sand column is all higher than 95%, and the removal rate of zinc by zeolum column is above 90% within three days before water supply and then gradually reduces. A small amount of gravel properly added into river sand is conducive to improve its infiltration rate under the condition of guaranteeing the removal rate. When the mass ratio of river sand and gravel is 2:1, the infiltration rate of packing column can reach 4mm/min, and at the same time, its removal effect of various pollutants is also obvious.