Decolorizing method for waste kraft paper mill effluents

Details Decolorizing method for waste kraft paper mill effluents Decolorizing method for waste kraft paper mill effluents

1975-03-21

1976-03-23

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 49, 162 29, 162 49, C02C 502

Patent

active

039459179

ABSTRACT:
Considerable reduction in color of a kraft paper mill effluent has been found with the addition of barium ions (Ba.sup..sup.+2) to the effluent. Unlike the familiar lime decolorization process for kraft paper mill effluents, decolorization using barium is substantially independent of the pH of the effluent and the color removing mechanism is in the form of an occlusion of the color bodies from the effluent into the barium sulphate precipitate (BaSO.sub.4) which forms from the sulphate (SO.sub.4) already present in or added to the effluent. The amount of decolorization produced by the process of the present invention depends upon the amount of sulfate ions in the effluent, the amount of barium ion containing material added to the effluent and the relationship of the amount of barium to the amount of sulphate in the effluent. A slight excess of sulphate over the stoichiometric equivalent of barium is desired, and the total amount of barium ion containing material and sulphate that must be added to the effluent depends on the initial color of the effluent and the degree of decolorization desired.

REFERENCES:
patent: 1878525 (1932-09-01), Kaplan
patent: 3627679 (1971-12-01), Fuller
patent: 3655337 (1972-04-01), Polinski et al.
patent: 3736255 (1973-05-01), Ghassemi et al.
patent: 3740363 (1973-06-01), Fuller

Affiliated with

Also associated with

Rating

Decolorizing method for waste kraft paper mill effluents does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Decolorizing method for waste kraft paper mill effluents, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Decolorizing method for waste kraft paper mill effluents will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1642374