Method for treatment of waste water from pulp bleaching plants

Details Method for treatment of waste water from pulp bleaching plants Method for treatment of waste water from pulp bleaching plants

C - Chemistry, Metallurgy

02

F

362/44.5

C02F 1/78 (2006.01) D21C 11/00 (2006.01)

Patent

CA 1159165

ABSTRACT Waste water from pulp bleaching comprising chlorinated phenol, guaiacol and/or abietic acid derivatives is treated with ozone. By treatment with small amount of ozone, e.g. corresponding to 2 kg ozone/ton pulp, the amount of these chlorinated derivatives can be consider- ably reduced. Reduction degrees of at least 80 % have e.g. been obtained at treatment of waste water from the alkali step of the bleaching process.

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