Aluminum water treatment residuals as permeable reactive barrier sorbents to reduce phosphorus losses

Abstract Two aluminum water treatment residuals (Al-WTRs) from water treatment plants in Manatee County, FL and Punta Gorda, FL were evaluated as potential permeable reactive barrier (PRB) media to reduce groundwater phosphorus (P) losses. Short-term ( 70 g kg −1 . Sorption and desorption studies were conducted on the 98% P sorption effectiveness at shaking times ⩾2 h). The effect of DOC was minimal at −1 , but modest reductions ( −1 . The P sorption capacities of the Manatee and Punta Gorda Al-WTRs ( −1 and >75 g kg −1 , respectively, and the lifespan of an Al-WTR PRB is likely many decades. Desorption was minimal ( -l , but increased ( 70 g kg −1 . The