Browsing by Author "Hussein Iffa"

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    Defluoridation of Ground Waters Using Indigenous Clays
    (Addis Ababa Universty, 1999-08) Hussein Iffa; Chandravanshi B.S. (PhD)
    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.