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Removal of Mg from spring water using natural clinoptilolite

Published online by Cambridge University Press:  09 July 2018

S. Tomić ,
N. Rajić ,
J. Hrenović  and
D. Povrenović
S. Tomić
Affiliation:
Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia
N. Rajić*
Affiliation:
Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia
J. Hrenović
Affiliation:
Faculty of Science, University of Zagreb, Roosveltov trg 6, 10000 Zagreb, Croatia
D. Povrenović
Affiliation:
Faculty of Technology and Metallurgy, University of Belgrade, Karnegijeva 4, 11000, Belgrade, Serbia
*
*E-mail: nena@tmf.bg.ac.rs
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Abstract

Natural zeolitic tuff from Brus (Serbia) consisting mostly of clinoptilolite (about 90%) has been investigated for the reduction of the Mg concentration in spring water. The sorption capacity of the zeolite is relatively low (about 2.5 mg Mg g-1 for the initial concentration of 100 mg Mg dm-3). The zeolitic tuff removes Mg from water solutions by ion exchange, which has been demonstrated by energy dispersive X-ray analysis (EDS). The extent of ion exchange was influenced by the pH and the initial Mg concentration. Kinetic studies revealed that Lagergen's pseudo-second order model was followed. Intra-particle diffusion of Mg2+ influenced the ion exchange, but it is not the rate-limiting step. Rather than having to dispose of the Mg-loaded (waste) zeolite, a possible application was tested. Addition to a wastewater with a low concentration of Mg showed that it could successfully make up for the lack of Mg micronutrient and, accordingly, enabled the growth of phosphate-accumulating bacteria A. Junii, increasing the amount of phosphate removed from the wastewater.

Keywords

natural zeoliteIgroš Vidojević depositBrusSerbiaclinoptiloliteMg removalbacteriawater softening
Type
Research Article
Information
Clay Minerals , Volume 47 , Issue 1 , March 2012 , pp. 81 - 92
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2012

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