Method of separation of fluoride ion from water

Details Method of separation of fluoride ion from water Method of separation of fluoride ion from water

1977-01-24

1978-08-01

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

210 47, 210 51, 210 53, 210DIG32, 204149, C02B 114

Patent

active

041041593

ABSTRACT:
To remove fluoride from raw water, whether the fluoride is in solution as an ion or in the form of a colloidally-dispersed salt, calcium ions are first introduced into the water. The resultant calcium fluoride is adsorbed on a floc during passage of electric current through the raw water. The floc may be formed from organic matter already present in the raw water or from diatomaceous earth floc in a separate operation, the diatomaceous earth floc then being added to the raw water. Adsorption on floc whether originating in organic matter or in diatomaceous earth is facilitated by the passage of electric current through the raw water and by the addition of a surfactant.

REFERENCES:
patent: 2531451 (1950-11-01), Maier
patent: 2914474 (1959-11-01), Hillyer et al.
patent: 3404088 (1968-10-01), Dujardin
patent: 3414497 (1968-12-01), Kanai
patent: 3551332 (1970-12-01), Baumann et al.
patent: 3800024 (1974-03-01), Forsell et al.
patent: 3926753 (1975-12-01), Lee

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