Chlorine-based bleachery effluent treatment

Details Chlorine-based bleachery effluent treatment Chlorine-based bleachery effluent treatment

C - Chemistry, Metallurgy

02

F

204/98.03, 204/5

C02F 1/46 (2006.01) C02F 9/00 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1077435

ABSTRACT OF THE DISCLOSURE The method of treating a chlorine-based total bleachery effluent in which only a chlorine and sodium salts are used in the bleach sequence comprising the steps of adding aluminum ion to said effluent in an amount sufficient to precipitate substan- tially all of the organics and suspended solids therein, seaparating the solids from said effluent, electrodialyzing the treated effluent to provide two effluent streams, one containing 200 to 600 parts per million sodium chloride which can be returned to the bleachery, and a second concentrated stream containing 5 to 10% by weight sodium chloride, evaporating said concentrated stream to a concentration of about 25% sodium chloride by weight, and electrolyzing said concentrated sodium chloride solution to produce chlorine gas, sodium hydroxide, and sodium hypochlorite.

265067

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