Title:
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Phosphate recovery from treated municipal wastewater using hybrid anion exchangers containing hydrated ferric oxide nanoparticles
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Author:
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You Chen, Xialei; Valderrama Angel, César Alberto; Soldatov, V.; Cortina Pallás, José Luís
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Other authors:
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Universitat Politècnica de Catalunya. Departament d'Organització d'Empreses; Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials |
Abstract:
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BACKDROUND
This study presents the evaluation of two ion exchangers (granular and fibrous) impregnated with nanoparticles of hydrated ferric oxide (HFO) as selective sorbents for phosphate recovery from aqueous solutions. The hybrid impregnated anion exchangers combine the durability and mechanical strength of a polymeric weak base anion exchange resin with the high sorption affinity of HFO towards phosphate species. Dynamic experiments were carried out and data obtained were fitted to a well-known fixed-bed sorption model.
RESULTS
The theoretical sorption capacities reported by the Thomas model were in good agreement with the breakthrough experimental capacities determined from the sorption data. The sorption capacity decreased when using wastewater treatment plant secondary effluents in comparison with synthetic water mainly owing to the presence of organic matter and suspended solids. The phosphate sorbed on the impregnated ion exchangers was efficiently desorbed by using a 0.5 mol L-1 sodium hydroxide solution, reporting up to 90% of recovery.
CONCLUSION
The reusability of sorbents was evaluated through five sorption–desorption working cycles. Fiban-As was able to operate up to three consecutive cycles with good sorption performance while a significant decrease of sorption capacity after the first cycle was observed for FO36 resin. © 2017 Society of Chemical Industry |
Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria química -Oxides -Phosphates -Sewage--Purification--Phosphate removal -Òxids -Fosfats -Aigües residuals -- Depuració |
Rights:
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Document type:
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Article - Draft Article |
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