EFFECT OF CALCIUM ADDITION ON THE DEFLUORIDATION CAPACITY OF BONE CHAR

P. Jacobsen, Elian Dahi

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

    Abstract

    Dosage of small amounts of calcium chloride to fluoride water prior to contact with bone char which has already been saturated with fluoride is shown to provide an additional fluoride removal capacity. The additionally obtained removal capacity increases with slower filtration velocities and increasing calcium dosage. A filtration velocity of 0.07 m/h, corresponding to a contact time of about 2 hours, and a dosage of 100 mgCa/L, are shown to provide an additional removal capacity of about 3 mgF/g, i.e. almost a doubling of the genuine removal capacity of the bone char. The process is shown to be capable of reducing the fluoride concentration form 10 to about 0.5 mgF/L. The additionally saturated column is shown to be regenerated by simple adjustment of the pH of the water to 11 and allowing to flow for a few bed volumes. The useful regeneration capacity, where the fluoride concentration is reduced from 10 to less than 1.5 mg/L is determined to be about 1.0 mg/g.
    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 pages6
    Publication date1997
    Pages94-99
    Publication statusPublished - 1997
    Event2nd International Workshop on Fluorosis and Defluoridation of water - Nazreth, Ethiopia
    Duration: 19 Nov 199725 Nov 1997

    Conference

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

    Keywords

    • Bone char
    • Fluoride
    • Calcium
    • Defluoridation capacity
    • Regeneration
    • Contact precipitation

    Cite this

    Jacobsen, P., & Dahi, E. (1997). EFFECT OF CALCIUM ADDITION ON THE DEFLUORIDATION CAPACITY OF BONE CHAR. In E. Dahi, & J. M. Nielsen (Eds.), Proceedings of the 2nd International Workshop on Fluorosis Prevention and Defluoridation of Water (pp. 94-99)