KINETICS OF SORPTION OF FLUORIDE ON CALCINED MAGNESITE IN BATCH

J. J. Singano, D. A. Mashauri, F. W. Mtalo, Elian Dahi

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearch

    Abstract

    A series of sorption of fluoride on calcined magnesite are obtained from thermostatic pH-chemostat and jar test experiments. The fluoride removal is observed not to start instantly, as normal, but after a lag time of up to ½ an hour of contact time. A model for sorption kinetics is developed, based on first-order reaction with respect to the concentration of fluoride. The rate constant is directly proportional to the dosage. The model takes into accounts the lag time observed. The kinetical model can be described for any given dosage and initial fluoride concentration in the water. The reaction rate parameter, K, varies however slightly for different initial concentrations of fluoride in the water and different dosage of calcined magnesia. These relationships are described separately by two linear equations. It is discussed that the observed lag time is due to the fact that magnesia cannot remove fluoride without hydrolysis, and it is probably this hydrolysis which constraint the start of the removal.
    Original languageEnglish
    Title of host publicationProceedings of the 2nd International Workshop on Fluorosis Prevention and Defluoridation of Water
    EditorsEli Dahi, Joan Maj Nielsen
    Number of pages7
    Publication date1997
    Pages83-89
    Publication statusPublished - 1997
    Event2nd Workshop on Fluorosis and Defluoridation - Nazreth, Ethiopia
    Duration: 19 Nov 199725 Nov 1997

    Conference

    Conference2nd Workshop on Fluorosis and Defluoridation
    CountryEthiopia
    CityNazreth
    Period19/11/199725/11/1997

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