Method for purifying process water or wastewater containing wood resin
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United States of America Patent
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-
Oct 11, 1994
Grant Date -
N/A
app pub date -
Apr 30, 1993
filing date -
May 5, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Wood-resin-containing process water or wastewater from the pulp industry is purified by adding, as flocculants, a high-molecular-weight polyethylene oxide and a water-soluble, non-ionic cellulose ether, suitably having a flocculation temperature of 35.degree.-80.degree. C. The added amount per liter of water is preferably 2-20 mg of the high-molecular-weight polyethylene oxide and preferably 5-30 mg of the non-ionic cellulose ether.
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