Water softening process

Details Water softening process Water softening process

1975-02-25

1976-08-24

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

210 47, 210 53, 210 75, B01D 1300

Patent

active

039765695

ABSTRACT:
This invention involves an improved process for softening hard water which comprises selectively precipitaing CaCO.sub.3 to form a thin layer thereof, increasing the pH of said water to precipitate magnesium as magnesium hydroxide and then filtering the resultant slurry through said layer. The CaCO.sub.3 layer serves as a thin permeable layer which has particularly useful application in cross-flow filtration applications.

REFERENCES:
patent: 3037632 (1962-06-01), Du Jardin
patent: 3259717 (1941-10-01), Zentner
patent: 3462362 (1969-08-01), Kollsman
patent: 3577339 (1971-05-01), Baird et al.
patent: 3733265 (1973-05-01), Kraus et al
patent: 3743595 (1973-07-01), Johnson
patent: 3778366 (1973-12-01), Kraus
patent: 3835040 (1974-09-01), Mahlman et al.
patent: 3839199 (1974-10-01), Weiss et al.

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