Process for purification and recycle of solutions

Details Process for purification and recycle of solutions Process for purification and recycle of solutions

1994-02-02

1996-08-20

Lacey, David L.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 50, 162DIG8, 204529, 204634, 210748, 205503, 205510, 205464, 205618, 205749, D21C 1100

Patent

active

055475426

ABSTRACT:
The invention relates to a process for treating a low-concentrated aqueous feed solution which includes at least one aqueous process stream from a pulp mill. The process includes concentrating the feed solution by evaporation to form an evaporation concentrate, and subjecting at least a part of the concentrate to a first electrodialysis treatment, thereby forming a first electrodialysis concentrate containing salt removed from the evaporation concentrate and at least one diluate depleted in the salt. The invention also relates to a plant for carrying out the above process.

REFERENCES:
patent: 3986951 (1976-10-01), Fremont
patent: 4995983 (1991-02-01), Eadie et al.
patent: 5061343 (1991-10-01), Azarniouch et al.
patent: 5122240 (1992-06-01), Conley et al.
patent: 5127992 (1992-07-01), Davies et al.
patent: 5139632 (1992-08-01), Chlanda et al.
Hynninen, Pertti, "Effluent Treatment", Pilot Plant . . . organic material, Feb. 1989 TAPPI Journal, pp. 167-170.
Bertel Myreen, "Closing up the Bleach Plant: A Research Program Into Effluent Evaporation", APPITA '91/187-191.

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