Research on the Reduction Performance of Surface Runoff Pollution Through Permeable Pavement with Different Structures

摘要

Permeable pavements (PPs) are used to address water quality impacts from urban roads. However, the effectiveness of different structure combinations in removing runoff pollutants throughout the permeable system remains unclear. In this study, 26 PP structures were tested to investigate their pollutant removal efficiency by the self-developed laboratory apparatus to provide a quantitative understanding of these combinations. The results showed PP was the most effective in removing total suspended solids (TSS) and lead (Pb) among all pollutants studied, with maximum removal rates of 91% and 96%, respectively. PP also can remove ammonia (NH4+-N), nitrogen (TN), phosphorous (TP), and chemical oxygen demand (COD) to some extent; the removal rate was 1 similar to 36%. Furthermore, the pollutant removal efficiency was not dependent on a simple stacked combination of structures or materials. The combined surface structure of permeable asphalt mixture (PAM) and permeable cement concrete (PCC) was more effective in removing runoff pollutants than a single surface structure of the same thickness, and the optimal surface layer thickness (8 cm) and base course thickness (26 cm) of PCC were recommended respectively. Based on experiment findings, the relationships between TSS removal rates and the other six pollutants were established, and independent target pollutants removal rates (75%, 80%, 85%) based on TSS were selected for proposing a series of PP structures and thicknesses. The insights generated from this study will help in the design and implementation of PP for runoff pollution abatement.