Abstract
Urban stormwater runoff has been implicated as a major source of excess nutrients to surface waters, contributing to the development of eutrophic conditions. Bioretention, a promising technology for urban stormwater pollution treatment, was investigated to determine whether an aluminum-based water treatment residual (WTR) amended bioretention soil media (BSM) could adsorb sufficient P at low concentrations (120 μg P L-1), extrapolated for a 20-year facility lifetime. Batch and minicolumn studies were employed to determine both an optimal BSM mixture and media performance. Media tests demonstrated P adsorption proportional to WTR addition. Additional amendments such as quartz sand and hardwood bark mulch produced further significant variations in adsorptive behavior. WTR-amended media showed excellent P removal, meeting the developed benchmark for adsorptive behavior. Predominantly, media met minimal P adsorption requirements when it contained at least 4 to 5% WTR by mass (air dried). The use of an oxalat...
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