In order to make ecological percolation system play a superior role in the control of pavement runoff pollution, purification capacity of five typical percolation media was tested by laboratory simulating device, in which sewage sample was prepared equally to event mean concentration (EMC) of pavement runoff. Then, microscopic observation and element analysis are performed on percolation media using environmental scanning electron microscope and energy dispersive X-ray fluorescence

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... Results indicated that purification effects of percolation media are significantly different. Percolation media mainly have two modes to reduce runoff pollutants concentration, pore adsorption and space interception, respectively. Finally, fuzzy comprehensive evaluation method was adopted to quantify purification effect of different percolation media. Combinations of percolation media were recommended for different pollution situations.