Reclaiming of spent brine

Details Reclaiming of spent brine Reclaiming of spent brine

1993-01-19

1993-10-19

Spear, Frank

Liquid purification or separation

Processes

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

210652, B01D 6104

Patent

active

052542572

ABSTRACT:
The method of purifying spent brine from the regeneration of ion exchange resin, for example resin in water softeners. The method comprises acidifying the spent brine to a pH of less than 3 with an acid other than sulfuric acid, which acid is preferably chosen from at least one acid which forms a calcium salt that is more water soluble than calcium sulfate. One passes the brine through a nanofiltration membrane to purify the brine by separating from it a waste stream which comprises the majority of the polyvalent ions present, so that the purified brine has most of its contaminating polyvalent ions removed.

REFERENCES:
patent: 4176057 (1979-11-01), Wheatley et al.
patent: 4889633 (1989-12-01), Pfenninger
Article by Howard Conner entitled Brine Recovery, (Water Technology, Jul., 1992, pp. 34 and 35.
Article by Larry Lien entitled Nanofiltration: Trend of the Future? from Water Conditioning & Purification, Sep., 1992, pp. 24 et seq.
A photocopy of a data sheet relating to Filmtec Membranes of the Dow Chemical Company, (5 pages).

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