Foam separation method for reducing AOX, COD, and color bodies o

Details Foam separation method for reducing AOX, COD, and color bodies o Foam separation method for reducing AOX, COD, and color bodies o

1995-06-01

1997-09-23

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 3011, 162DIG8, 210917, 210928, D21C 1100

Patent

active

056700202

ABSTRACT:
The invention described in the specification relates to a process and apparatus for reducing AOX, COD and color bodies from the filtrate streams generated by a kraft pulp bleaching sequence. The method involves vigorously mixing an F.sub.D filtrate with an F.sub.E filtrate to form a filtrate mixture and treating the filtrate mixture with a coagulating compound, a flocculating compound and recycled foam concentrate. After chemically treating the filtrate mixture, the mixture is foamed with air in order to capture floc which formed in the mixture. Concentration of the foam and recycle of the foam to the filtrate mixture has been found to significantly increase the concentration of and reduce the amount of solids generated in the treatment system.

REFERENCES:
patent: 2874842 (1959-02-01), Krofta
patent: 4626356 (1986-12-01), Suzuki et al.
patent: 4724045 (1988-02-01), Ackel
patent: 4738750 (1988-04-01), Ackel
patent: 4783263 (1988-11-01), Trost et al.
patent: 5013454 (1991-05-01), Hynninen
patent: 5178770 (1993-01-01), Chung
patent: 5374333 (1994-12-01), Nykanen et al.

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