title: Prospect of recovering phosphorus in magnesium slag-packed wetland filter.
abstract: Phosphorus recovery from wastewater not only reduces the unbearable impacts of excessive nutrient discharge on environmental systems but also favor the reuse of phosphorus resource. Based on the mechanism as well as technical analysis for major phosphorus recovery techniques including struvite precipitation and wetland substrate adsorption, a novel magnesium slag-packed wetland filter and corresponding operational procedures are proposed, which aim to reduce the dependence of using magnesium-containing chemical reagent as magnesium sources for struvite precipitation, and improve the accumulation and recovery performance for struvite precipitation within porous wetland substrate. Results from preliminary experiments indicated that magnesium slag particles with approximately 2 mm in diameter can recover 43.20-72.39% phosphorus from 1-25 mol/L PO43-solution, and the presence of 5-50 mol/L NH4+contributed to 11.71-29.11% enhancement of phosphorus recovery mainly due to struvite precipitation. The detected generation of struvite via XRD spectrum analysis partly demonstrated the potential of phosphorus recovery in magnesium slag-packed wetland filter. The proposed phosphorus recovery technology is free of secondary pollution and solid waste generation; phosphorus-saturated (mainly due to struvite precipitation and adsorption) magnesium slag particles can be potentially used as phosphorus fertilizer and thus partly solved the traditional shortages of disposing phosphorus-saturated substrate due to low phosphorus contents.
authors.affiliation: Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China. ckyshj@126.com.|Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China. ckyshj@126.com.|Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Yichang, Hubei province, 443002, China. ckyshj@126.com.
authors.forename: Xianqiang
authors.initials: X
authors.lastname: Tang
authors.affiliation: Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China.|Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.|Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Yichang, Hubei province, 443002, China.
authors.forename: Min
authors.initials: M
authors.lastname: Wu
authors.affiliation: Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China.|Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Li
authors.affiliation: Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, China.|Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, China.|Collaborative Innovation Center for Geo-Hazards and Eco-Environment in Three Gorges Area, Yichang, Hubei province, 443002, China.
authors.forename: Zhenhua
authors.initials: Z
authors.lastname: Wang
mesh_terms: D000327:Adsorption; D011232:Chemical Precipitation; D005374:Filtration; D017616:Magnesium Compounds / Q000737:chemistry*; D008962:Models, Theoretical; D010758:Phosphorus / Q000032:analysis*; D000069877:Struvite / Q000032:analysis*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis*; D053833:Wetlands
chemical_list: D017616:Magnesium Compounds; D010758:Phosphorus; D000069877:Struvite; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Adsorption; Magnesium source; Phosphorus; Struvite precipitation; Wetland filter