Bone char quality and defluoridation capacity in contact precipitation

J. Albertus, Henrik Bregnhøj, M. Kongpun

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


    Samples from six different brands of bone char are tested for their capacity to remove fluoride from water in batch. Initial concentrations of 10 mg/L and contact times of 6 hours are used. The removal capacities observed are 0.6-1.1 mg/g on an average, s.d. being 0.16. Addition of calcium and phosphate compounds to the jar experiments results in more than doubling of these capacities, on average 1.9 mg/g, s.d. being 0.14. One of bone char products is setup in columns are fed with water, 100 mg/L, for saturation. Hereafter the coloumns are fed with water of 10 mgF/L where calcium and phosphate are added as in the contact precipitation process. The results show that the columns are able to remove up to 700 bedvolumes, before the concentration of fluoride in the effluent water breaks through, above 1.5 mg/L. Operational removal capacities observed are 7 and 9 mg/L, depending on contact time and the dosage of chemicals. It is discussed that longer contact time and higher dosage of calcium and phosphate may result in longer operation periods in the contact precipitation columns.
    Original languageEnglish
    Title of host publicationProceedings of the 3rd International Workshop on Fluorosis Prevention and Defluoridation of Water
    EditorsE. Dahi, S. Rajchagool, N. Osiriphan
    Place of PublicationChiang Mai, Thailand
    PublisherISFR, EnDeCo & ICOH
    Publication date2002
    Publication statusPublished - 2002
    Event3rd International Workshop on Fluorosis Prevention and Defluoridation of Water - Chiang Mai, Thailand
    Duration: 20 Nov 200024 Nov 2000
    Conference number: 3


    Workshop3rd International Workshop on Fluorosis Prevention and Defluoridation of Water
    CityChiang Mai


    • sorption
    • Bone char
    • contact precipitation
    • batch experiment
    • pyrolysis
    • defluoridation
    • dynamic removal capacity
    • calcination
    • flowexperiment
    • operational removal capacity
    • jar test

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