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.