Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1995-06-01
1997-05-06
Czaja, Donald E.
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 301, 162 33, 162DIG9, D21C 1100
Patent
active
056267177
ABSTRACT:
The invention described in the specification relates to a process and apparatus for the reduction of adsorbable organic halide (AOX), chemical oxygen demand (COD) and color bodies from the filtrates generated in a chlorine compound-containing pulp bleaching sequence. The method involves vigorously and intensely mixing certain pulp bleaching filtrates in order to lower the AOX content of the filtrate and the use of a peroxy compound and a ferrous salt catalyst to treat a combined filtrate streams thereby significantly reducing the level of AOX, COD and color in the effluent leaving the pulp bleaching plant.
REFERENCES:
patent: 3961976 (1976-06-01), Karlsson
patent: 5120448 (1992-06-01), Dorica et al.
patent: 5149442 (1992-09-01), Nystrom et al.
DE 4,314,521 (abstract only) Treatment of industrial waste water contaminated with organic substances.
CA 2,096,891 (abstract only) Catalytic wet air oxidn. process for waste water treatment.
Field Jasper H.
Gallagher Hugh P.
Hung Christopher P.
Yin Caifang
Czaja Donald E.
International Paper Company
Leavitt Steven B.
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