Friday 2 January 2009

Removal of Fluoride from Drinking Water: Analysis of Alumina Based Sorption by Theodora Stewart

Fluorosis, a disease caused by exposure to elevated levels of fluoride in drinking water, impacts
millions of people in both developed and developing countries. It is, therefore, important to
improve existing methods of defluoridation. This review discusses the sorption of fluoride to
alumina sorbants, a widely used defluoridation filter material. To discover significant factors that influence the sorption process, and to thus learn how this technique might be enhanced, a
select group of peer reviewed sorption studies were compared. As a result of this analysis, it is
clear that fluoride sorption to alumina sorbants is a complex process in which differences in
surface morphology, pH, temperature, fluoride concentration and the presence of other major
ions such as sulfates and bicarbonates interact to produce a wide range of reported specific sorption values

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