Defluoridation of Ground Waters Using Indigenous Clays
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Date
1999-08
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Addis Ababa,University
Abstract
The properti es 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 li ving organisms were briefly rev iewed. Several methods suggested from time to lime 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 (art ifi cial and
natural) by adsorptionlion·cxchange with clays, collected from diffcn:nl parts uf the: country was
examined. The effects of several parameters such as Illass of adsorbent, canlact lime, volume of
water, and pH of the solution on the fluoride removal effic iency of clays were studi ed. Among
the adopted clays for deOuoridat ion study, fi red clay was found to be the least deOuoridating
agent. The other raw clays manifcsted the promising results to use at commun ity and household
levels with black and red clays being the best deOuorid at ing agent. A mechanism of
deOuoridation by clays was verified experim entally. The regeneration capacity of the clays was
tested using a regenerant I % (w/v) NaOI-! .
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Keywords
Defluorida Tion