Treatment of effluents in a chlorine based pulp bleaching plant

Details Treatment of effluents in a chlorine based pulp bleaching plant Treatment of effluents in a chlorine based pulp bleaching plant

D - Textiles, Paper

21

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8/79, 9/36.7

D21C 9/12 (2006.01) B01J 41/04 (2006.01) C02F 9/00 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1082857

Abstract of the Disclosure Effluents in a chlorine based pulp bleaching plant arc puri- fied by treatment in a bed containing a particulate, weakly basic anion ex- change and/or absorbent resin which takes up coloured lignin degradation products from the effluent. Subsequently the resin bed is eluted by means of an alkaline solution, a portion of the eluate released from the resin bed being acidified to a pH of less than about 2 to precipitate part of the solids of the effluent. The precipitate is separated from the residual acidic liquor and transferred to a recovery plant for eventual disposal. The chlorine content of the precipitate is relatively low, thereby reducing pollution and corrosion problems during the disposal.

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