Process for purifying waste water containing fluoride ion

Details Process for purifying waste water containing fluoride ion Process for purifying waste water containing fluoride ion

1977-01-24

1979-03-20

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 47, 210 53, 210DIG32, 423163, C02B 120

Patent

active

041452828

ABSTRACT:
A process for purifying waste water containing fluoride which comprises precipitating fluoride from the waste water as fluorapatite. Fluoride is removed as fluorapatite by having sufficient available calcium for each mole of fluoride present in the waste water and sufficient available phosphate for each mole of fluoride in the waste water to form a precipitate which is or converts to sufficient fluorapatite to remove essentially all fluoride from the waste water.

REFERENCES:
patent: 2380800 (1945-07-01), Smith et al.
patent: 3284350 (1966-11-01), Williamson
patent: 3467496 (1969-09-01), English et al.
patent: 3552918 (1971-01-01), Fitch et al.
patent: 4028237 (1977-06-01), Nishimura et al.
Van Wazer J. R.; "Phosphorus and its Compounds" vol. I; Interscience Publishers Inc. 1961, p. 522.
Rabosky J. G. et al., "Fluoride Removal by Lime Precipitation and Alum and Polyelectrolyte Coagulation"; Proc. of the 29th Ind. Waste Conf. pp. 669-676 (1974).

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