title: Pilot-scale removal and recovery of dissolved phosphate from secondary wastewater effluents with reusable ZnFeZr adsorbent @ Fe3O4/SiO2particles with magnetic harvesting.
abstract: Advanced nanocomposite magnetic particles functionalized with ZnFeZr-adsorbent are developed, characterized and tested for the removal and recovery of phosphate directly from spiked secondary wastewater effluent (∼10 mg/L PO4-P). The phosphate loaded particles can be extracted from the liquid phase via magnetic separation, regenerated in a NaOH solution where phosphate desorption takes place, and reused in numerous cycles. Laboratory experiments demonstrate their reusability and stability in 60 consecutive adsorption/desorption runs where under optimal conditions > 90% total P-recovery efficiency is reached. In addition, pilot tests are performed to verify the proof-of-concept by upscaling the technology and maintain high efficiency of phosphate removal and recovery after treating 1.5 m3wastewater in 20 cycles. Effluent concentrations <0.05 mg/L PO4-P can be achieved in the treated wastewater. The reclaimed desorption solution is concentrated with phosphate ions through its repetitive application, attaining up to 38-times enrichment (∼380 mg/L PO4-P) compared to the initial concentration in wastewater. The P-rich eluate is used as a source for subsequent precipitation of a solid fertilizer product such as struvite.
authors.affiliation: University of Stuttgart, Institute for Sanitary Engineering, Water Quality and Solid Waste Management (ISWA), Bandtäle 2, 70569, Stuttgart, Germany. Electronic address: asya.drenkova@iswa.uni-stuttgart.de.
authors.forename: Asya
authors.initials: A
authors.lastname: Drenkova-Tuhtan
authors.affiliation: Fraunhofer Institute for Silicate Research (ISC) Neunerplatz 2, 97082, Würzburg, Germany; University of Würzburg, Chair of Chemical Technology of Materials Synthesis, Röntgenring 11, 97070, Würzburg, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Schneider
authors.affiliation: Institute of Functional Interfaces, Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Franzreb
authors.affiliation: University of Stuttgart, Institute for Sanitary Engineering, Water Quality and Solid Waste Management (ISWA), Bandtäle 2, 70569, Stuttgart, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Meyer
authors.affiliation: Fraunhofer Institute for Silicate Research (ISC) Neunerplatz 2, 97082, Würzburg, Germany.
authors.forename: Carsten
authors.initials: C
authors.lastname: Gellermann
authors.affiliation: Fraunhofer Institute for Silicate Research (ISC) Neunerplatz 2, 97082, Würzburg, Germany; University of Würzburg, Chair of Chemical Technology of Materials Synthesis, Röntgenring 11, 97070, Würzburg, Germany.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Sextl
authors.affiliation: Fraunhofer Institute for Silicate Research (ISC) Neunerplatz 2, 97082, Würzburg, Germany; University of Würzburg, Chair of Chemical Technology of Materials Synthesis, Röntgenring 11, 97070, Würzburg, Germany.
authors.forename: Karl
authors.initials: K
authors.lastname: Mandel
authors.affiliation: University of Kaiserslautern, Department of Civil Engineering, Resource Efficient Wastewater Technology, Paul-Ehrlich-Str. 14, 67663 Kaiserslautern, Germany.
authors.forename: Heidrun
authors.initials: H
authors.lastname: Steinmetz
mesh_terms: D000327:Adsorption; D010710:Phosphates; D012822:Silicon Dioxide; D000069877:Struvite; D062065:Wastewater
chemical_list: D010710:Phosphates; D012822:Silicon Dioxide; D000069877:Struvite; D062065:Wastewater
keywords: Magnetic separation; Microparticles; Phosphate elimination; Sorption; Struvite recovery; Wastewater effluent