Method of treating fluoride-containing water

Details Method of treating fluoride-containing water Method of treating fluoride-containing water

1990-09-24

1991-08-27

Dawson, Robert A.

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

210639, 210650, 210651, 210723, 210915, 423244, B01D 1504

Patent

active

050430726

ABSTRACT:
Dsiclosed is a method of treating fluoride-containing water, which comprises a reaction step where a calcium compound and/or an aluminium compound are/is added to fluoride-containing water while the pH value of the resulting suspended liquid is adjusted to fall within the range of from 6 to 8, and at least a part of the concentrated suspension to be formed in the membrane-separation step of the following stage is added to the suspended liquid and stirred and the resulting suspension is introduced into the circulation tank; a membrane-separation step where the suspension from the circulation tank is treated by membrane-separation to separate it into a permeated solution and a concentrated suspension; a circulation step where at least a part of the concentrated suspension to be taken out from the membrane-separation step is returned back to the reaction step while the remaining part thereof is circulated to the circulation tank; and a step where the permeated solution is taken out from the membrane-separation step as a treated water. The method is free from scaling disorder of the apparatus used and gives a treated water of high quality stably and efficiently.

REFERENCES:
patent: 2531451 (1947-10-01), Maier
patent: 3939070 (1976-02-01), Roth
patent: 4014787 (1977-03-01), Shorr
patent: 4297332 (1981-10-01), Tatani et al.

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