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Title: | Modification of a natural zeolite with Fe(III) for simultaneous phosphate and ammonium removal from aqueous solutions |
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Author: | Guaya Caraguay, Diana Elizabeth; Valderrama Angel, César Alberto; Farran Marsà, Adriana; Cortina Pallás, José Luís |
Other authors: | Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials |
Abstract: | BACKGROUND: The incorporation of Fe(III) was performed in a natural clinoptilolite (Z-N) for simultaneous phosphate and ammonium removal. RESULTS: The existence of hydroxyl groups (congruent to Fe-OH) in the iron zeolite (Z-Fe) enhances the phosphate uptake from 0.6 +/- 0.1 mg-P g(-1) in Z-N to 3.4 +/- 0.2 mg-P g(-1) in Z-Fe. However, the ammonium sorption capacity slightly decreases from 33 +/- 2 mg-N g(-1) in Z-N to 27 +/- 2 mg-N g(-1) in Z-Fe. The equilibrium and kinetics sorption were well explained by the Langmuir isotherm and the intraparticle diffusion model, respectively. CONCLUSIONS: Both the phosphate and ammonium uptake were slightly affected by the coexistence of competing ions. The phosphate sorption capacity of iron zeolite was decreased in the regeneration cycles. Desorption using a 1 mol L-1 NaOH solution under dynamic conditions provided higher enrichment factors for ammonium than phosphate |
Abstract: | Peer Reviewed |
Subject(s): | -Àrees temàtiques de la UPC::Enginyeria química -Sewage--Purification -Zeolites -Clinoptilolite -Iron -Phosphate -Ammonium -Sorption -Kinetic -Swine waste-water -Coal fly-ash -Modified clinoptilolite -Adsorptive removal -Eutrophic waters -Rich tuffs -In-situ -Iron -Adsorbent -Sorption -Zeolites -Aigües residuals -- Depuració -- Eliminació d'amoni |
Rights: | http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type: | Article - Submitted version Article |
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