Method of removing metal ions dissolved in the bleach plant wast

Details Method of removing metal ions dissolved in the bleach plant wast Method of removing metal ions dissolved in the bleach plant wast

1997-01-03

1998-04-21

Czaja, Donald E.

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

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

162 65, 162 78, 162DIG8, D21C 1100

Patent

active

057413983

ABSTRACT:
Methods of treating process water containing metal ions is disclosed including contacting the process water with a pulp comprising lignocellulose-containing material at a pH of above about 7 and a temperature of from about 50.degree. to 120.degree. C. whereby at least a portion of the metal ions are removed from the process water. Preferably the process water is produced from initially washing a pulp solution prior to a bleaching step employing hydrogen peroxide or ozone.

REFERENCES:
patent: 5352332 (1994-10-01), Maples et al.
patent: 5401362 (1995-03-01), Lindberg
patent: 5462641 (1995-10-01), Bergvist et al.
patent: 5554259 (1996-09-01), Gandek et al.
Casey, P. J. "Pulp & Paper . . . ", by John Wiley & Sons, 3rd Ed, vol. I, 1980, pp. 728-731.

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