Greening the gray infrastructure: Green adsorbent media for catch basin inserts to remove stormwater pollutants

Stormwater pollution is a major cause of water quality impairment. Much the existing gray stormwater infrastructures provide little or no treatment, especially for dissolved pollutants. Due to capital cost installing new infrastructure, retrofitting promising alternative reduce pollution. In this study, aluminum-based drinking treatment residuals (WTR), byproduct from was combined with other common materials (sand and carbon material) formulate an adsorbent media use in catch basin inserts remove total petroleum hydrocarbons (TPH), Cu, Pb, Zn runoff. Hydraulic performance were optimized laboratory column experiments. A dual-layer media, WTR-amended sand mass percentage 5% WTR relative over material depth ratio 1:3, selected as optimal. The breakthrough curves correlated well Yan model. During field influent effluent samples collected two basins eight storm events analyzed turbidity, pH, TPH, Zn. median removal efficiencies Zn, TPH during study 27.4%, 36.3%, 69.3%, 45.6%, respectively. particulate-bound pollutants indicated by reduction turbidity 81.2%. slight increase pH observed. There ponding study. Our results show that low-tech, low-cost effective reducing metal organic stormwater.