Journal
CHEMICAL ENGINEERING JOURNAL
Volume 271, Issue -, Pages 204-213Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2015.03.003
Keywords
Clinoptilolite; Natural zeolite; Modification; Hydrated aluminum oxide; Adsorption; Kinetic
Categories
Funding
- Ministry of Science and Innovation through the ZERODISCHARGE project [CPQ2011-26799]
- Catalan government [2009SGR905, 2014SGR050]
- Secretaria de Educacion Superior
- Ciencia
- Tecnologia e Innovacion (Senescyt - Ecuador)
- Universidad Tecnica Particular de Loja - Ecuador [2014: PROY_QUI_826]
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A natural zeolite (Z-N), rich in clinoptilolite, was modified (Z-Al) by incorporation of hydrated aluminum oxide (HAlO) for the simultaneous phosphate and ammonium removal. The incorporation of surface hydroxyl groups (similar or equal to Al-OH) into the zeolite structure, as active groups for phosphate removal, was characterized by acid-base titrations (pH(PZC) = 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. (C) 2015 Elsevier B.V. All rights reserved.
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