Defluoridation of Ground Waters Using Indigenous Clays
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Date
1999-08
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Addis Ababa Universty
Abstract
The properties of fluorine, its occurrence in nature and its source of incidence in various
media were presented. The fluoride metabolism, absorption, distribution, excretion and its effect
on living organisms were briefly reviewed. Several methods suggested from time to time for a
defluoridation purpose were clearly stated. The fluoride content of natural waters collected from
different parts of Ethiopia were reported . A study on the defluoridation of water (artificial and
natural) by adsorption/ion-exchange with clays, collected from different parts of the country was
examined . The effects of several parameters such as mass of adsorbent, contact time, volume of
water, and pH of the solution on the fluoride removal efficiency of clays were studied . Among
the adopted clays for defluoridation study, fired clay was found to be the least defluoridating
agent. The other raw clays manifested the promising results to use at community and household
levels with black and red clays being the best defluoridating agent. A mechanism of
defluoridation by clays was verified experimentally . The regeneration capacity of the clays was
tested using a regenerant 1 % (w/v) NaOH.
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Keywords
Natural waters