Elimination of bleach effluents

Details Elimination of bleach effluents Elimination of bleach effluents

1989-08-23

1992-07-07

Chin, Peter

Paper making and fiber liberation

Processes of chemical liberation, recovery or purification...

With regeneration, reclamation, reuse, recycling or...

162 301, 162 31, 162 38, 162 47, D21C 1100

Patent

active

051279924

ABSTRACT:
A process is provided for the treatment of an acidic aqueous effluent derived from a chlorine or chlorine compound bleaching process. The acidic effluent is reacted with a neutralizing base selected from carbonates, hydroxides and oxides of Al, Cr, Co, Fe, Mg, Mn, and Ni. The neutralized effluent is concentrated and residual base and HCl are subsequently recovered. The concentration of neutralized effluent may be accomplished by passing the neutralized effluent through the cooling tower of the pulp mill.

REFERENCES:
patent: 3758405 (1973-09-01), Fremont
patent: 4000264 (1976-12-01), Nagano et al.
patent: 4058458 (1977-11-01), Svarz
patent: 4070233 (1978-01-01), Matsuura
patent: 4259149 (1981-03-01), Jaszka et al.
patent: 4268350 (1981-05-01), Mansson
McIlroy, "The Control of Chloride Ions in MgO Recovery System", Tappi, vol. 56, No. 9 (Sep. 1973) pp. 79-82.

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