Spent brine reclamation

Details Spent brine reclamation Spent brine reclamation

1998-07-14

1999-12-21

Therkorn, Ernest G.

Liquid purification or separation

Processes

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

210651, 210652, B01D 6104

Patent

active

060044640

ABSTRACT:
A method of reclaiming spent aqueous brine solutions used in the regeneration of water-softening resins. An aqueous solution chloride or other brine is acidified with HCl to a pH of between about 0.5 and 6 and a soluble sulfate salt, preferably Na.sub.2 SO.sub.4 is added, together with a precipitation inhibitor of the type polyacrylamide. Following such treatment, the spent brine is pumped at high pressure axially through a spirally-wound nanofiltration-type membrane device which is effective to remove at least about 90% of the divalent hardness while allowing passage therethrough of at least about 90% of the monovalent cations. As a result of such treatment, about 90 to 95% of the volume of spent brine can be efficiently and effectively reclaimed in a form in which it is suitable for use again in regenerating water-softening resins or the like.

REFERENCES:
patent: 4176057 (1979-11-01), Wheatley
patent: 4277447 (1981-07-01), Chambers
patent: 4336232 (1982-06-01), Moritz
patent: 4714113 (1987-12-01), Mohnot
patent: 4889633 (1989-12-01), Pfenninger
patent: 5254257 (1993-10-01), Brigano et al.
patent: 5587083 (1996-12-01), Twardowski
Larry A. Lien, "Presentation on Nanofiltration", Water Quality Association, 1993 Annual Convention & Exhibition in San Antonio, TX, Mar. 17, 1993 pp. 1-26.
Larry Lien, "Nanofiltration: Trend of the Future?", Water Conditioning & Purification, pp. 24-26, Sep. 1992.
Larry Lien, Overhead Projection Slides shown at PWCA Meeting Presentation in Santa Barbara, May, 1992 pp. 1-5.

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