Method for purifying process water or wastewater containing wood

Details Method for purifying process water or wastewater containing wood Method for purifying process water or wastewater containing wood

1993-04-30

1994-10-11

Hruskoci, Peter A.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

162189, 210727, 210730, 210732, 210928, C02F 156

Patent

active

053544790

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.

REFERENCES:
patent: 3338828 (1967-08-01), Clark
patent: 3926951 (1975-11-01), Lindenfors et al.
patent: 5104551 (1992-04-01), Davis et al.
patent: 5178770 (1993-01-01), Chung
patent: 5230808 (1993-07-01), Chung et al.
Chemical Abstracts, vol. 115, No. 2, Jul. 15, 1991, (Columbus, OH), p. 390 abstract 14859s, & US, 596669.

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