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Simultaneous phosphate and ammonium removal from aqueous solution by a hydrated aluminum oxide modified natural zeolite
Guaya, Diana; Valderrama Angel, César Alberto; Farran Marsà, Adriana; Armijos, Chabaco; Cortina Pallás, José Luís
Universitat Politècnica de Catalunya. Departament d'Enginyeria Química; Universitat Politècnica de Catalunya. SETRI - Grup de Tècniques de Separació i Tractament de Residus Industrials
A natural zeolite (Z-N), rich in clinoptilolite, was modified (Z-Al) by incorporation of hydrated aluminium oxide (HAlO) for the simultaneous phosphate and ammonium removal. The incorporation of surface hydroxyl groups (ffiAl-OH) into the zeolite structure, as active groups for phosphate removal, was characterized by acid–base titrations (pHPZC= 4.5 ± 0.2). The phosphate sorption increases from 0.6 mg-P/g for Z-N up to 7.0 mg-P/g while only a slight decrease on the ammonium sorption capacity from 33 mg-N/g of Z-N to 30 mg-N/g for Z-Al was observed. The HAlO modified zeolite sorption capacity for both phosphate and ammonium was slightly reduced by common ions typically present in secondary waste water effluents. Column experiments revealed higher enrichment factor for ammonium (120) than for phosphate (50) using 1 M NaOH as elution solution. A reduction of zeolite phosphate capacity with regeneration cycles was observed
Àrees temàtiques de la UPC::Enginyeria química
Clinoptilolite
Zeolites
Aluminum oxide
Kinetics
Clinoptilolite
Natural zeolite
Modification
Hydrated aluminum oxide
Adsorption
Kinetic
SWINE WASTE-WATER
COAL FLY-ASH
ADSORPTIVE REMOVAL
SURFACE-CHARGE
DRINKING-WATER
ZERO CHARGE
STI ZEOLITE
RICH TUFFS
CLINOPTILOLITE
IRON
Zeolites
Amoni -- Absorció i adsorció
Alumini
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
info:eu-repo/semantics/submittedVersion
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