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Removal of excess fluoride ions from Saharan brackish water by adsorption on natural materials

Water supply for people in the Sahara region is mainly assured by poor quality ground water which has excessive minerals, hardness and high concentration of fluoride. This leads to many teeth and bones diseases such as fluorosis. The purpose of this study is to eliminate the excess of fluorides from...

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Published in:Desalination 2010-01, Vol.250 (1), p.408-413
Main Authors: Ramdani, A., Taleb, S., Benghalem, A., Ghaffour, N.
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Language:English
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cited_by cdi_FETCH-LOGICAL-c398t-f9c06491f04c9aec3d3568d25e9634de2fa5115233f2a26dd4828110f872fd9f3
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container_title Desalination
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creator Ramdani, A.
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Benghalem, A.
Ghaffour, N.
description Water supply for people in the Sahara region is mainly assured by poor quality ground water which has excessive minerals, hardness and high concentration of fluoride. This leads to many teeth and bones diseases such as fluorosis. The purpose of this study is to eliminate the excess of fluorides from the El Oued Souf City water supply located in the South East of the Algerian Sahara by retention process onto montmorillonite clay using potentiometric method. Two types of natural clays were tested. The first one contains a higher percentage of calcium (AC) and the second one without calcium (ANC). These adsorbents were activated chemically and thermally with temperatures ranging between 200 and 500°C. Experimental results showed that chemical activation proved effective adsorption reaching up to 88% whereas the thermal activation is ineffective and reached only around 5%. Moreover, the acidity of the medium and the alkalinity affect the adsorption considerably. The retention predicted from the adsorption isotherms is in agreement with Langmuir's model. The kinetic analysis of the reactions indicates that reaction is slow with diffusional control. The low values obtained for the heat of adsorption mean that the adsorption is exothermic with no specific type. An ionic mechanism exchange for fluoride removal is proposed in this study.
doi_str_mv 10.1016/j.desal.2009.09.066
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subjects Activation
Adsorption
Brackish
Calcium
Clay
Clay (material)
Desalination
Fluoride removal
Fluorides
Mathematical models
Saharan brackish ground water
Teeth
Water supplies
title Removal of excess fluoride ions from Saharan brackish water by adsorption on natural materials
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