FIELD: chemistry.
SUBSTANCE: invention can be used in chemical industry. Removal of toxic impurities from circulating water produced during countercurrent decantation washing of pulp, are carried out using oxidation-reduction processes. Decanting washing of pulp is carried out without the fresh water adding. Prior to each stage of countercurrent decanting washing, the pulp is mixed with recycled waters, where suspended particles are admitted in the amount of not more than 7.15 kg/m3.
EFFECT: proposed invention provides a reduction in the consumption of reagents while maintaining high levels of waste treatment from toxic impurities such as cyanides, thiocyanates, heavy metals, organic and inorganic compounds.
1 cl, 3 tbl, 6 ex, 4 dwg
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