Leaching and retention of dissolved metals in particulate loaded pervious concrete columns.

摘要: This study examined metal leaching and retention in pervious concrete with or without embedded particulate matter. Particulate matter was collected from an adjacent parking lot a nearby garage as examples of weathered un-weathered Particle size distributions were similar, but content 3-35-fold higher organic 3-fold the compared to Replicate columns established either no added control, 20 g Synthetic rainwater passed through at variable rainfall intensity fixed assess leaching. Metals leached concentrations amended column, all less than 1% mass leached. Rainfall did not have large effect on concentrations, only varying effluent by about 2-fold. stormwater elevated dissolved Cu, Zn, Cd Pb same removal efficiencies order 85-95%, 30-95%, 60-90%, 95+% for each metal, respectively. After loading column year's worth exposure, decreased, while performed similarly small drop Cu efficiencies. Generally, amendments similarly, suggesting is responsible majority initial retention. The retained more metals stormwater, perhaps due increase pH that promoted surface precipitation hydroxides carbonate species concrete, complexation iron oxides Overall, aided presence matter, itself important particulates A strategy environment could involve amending mixtures well-defined sorbents enhance