title: [Water treatment residual as a bioretention media amendment for phosphorus removal].
abstract: The characteristics of phosphorus adsorption of both soil and water treatment residual (WTR) were investigated through batch tests. The removal of phosphorus in runoff by bioretention column was evaluated. Furthermore, the feasibility of taking the WTR as a bioretention amendment was discussed. The results indicated that the phosphorus adsorptive capacity of WTR was significantly higher than that of soil. With a high influent phosphorus concentrations (1.0 mg x L(-1)), the columns with amended media showed a better long-term removal efficiency than the columns with traditional media. The concentrations of TP in effluent from columns with amended media were less than 0.050 mg x L(-1) after 7 months' continuous operation. According to batch test results, it was estimated that the phosphorus adsorptive capacity of amended media, which was mixed with 4% of WTR, was 4 times as high as the traditional media under same conditions. Adsorption and precipitation by amorphous iron and aluminum is the main mechanism for phosphorus removal in amended media. It is recommended that the mixture with 4% - 5% of WTR by mass in media would improve the phosphorus removal of bioretention in engineering practice.
authors.forename: Jian-Jun
authors.initials: JJ
authors.lastname: Wang
authors.forename: Tian
authors.initials: T
authors.lastname: Li
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D000535:Aluminum / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry*; D012987:Soil / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D012987:Soil; D010758:Phosphorus; D000535:Aluminum; D007501:Iron