Process for the decolorization of pulp mill process streams

Details Process for the decolorization of pulp mill process streams Process for the decolorization of pulp mill process streams

1985-05-20

1987-09-22

Cintins, Ivars

Liquid purification or separation

Processes

Ion exchange or selective sorption

210676, 210694, 210917, 210928, C02F 900

Patent

active

046953868

ABSTRACT:
A process for the decolorization of pulp mill process streams is described. The effluent from the process contains color bodies and organic materials, and is first fed to an acidification reactor where the pH is reduced. This causes a portion of the color bodies to precipitate. A flocculant is added to coagulate the precipitated lignins, and the solution is filtered. The filtrate then passes through a series of chambers where it is contacted with activated carbon in an advanced separation device (ASD). The regeneration of the carbon occurs simultaneously in other chambers of the ASD. The treated filtrate with significantly lower color bodies passes out of the ASD in a substantially continuous stream.

REFERENCES:
patent: 2617986 (1952-11-01), Miller
patent: 3652407 (1972-03-01), Paleos
patent: 4000033 (1976-12-01), Nicolle et al.
patent: 4383920 (1983-05-01), Muller et al.
patent: 4522726 (1985-06-01), Berry et al.

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