Method of removing metal ions dissolved in the bleach plant waste water
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United States of America Patent
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Apr 21, 1998
Issued Date -
N/A
app pub date -
Jan 3, 1997
filing date -
Aug 28, 1992
priority date (Note) -
Expired
status (Latency Note)
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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.
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