Electrodialysis of bleaching effluent

Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...

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8108R, 8108A, 162 63, 162 66, 162 89, 162DIG8, 204151, 204180P, 204DIG6, 210 22D, D21C 912, D21C 1100

Patent

active

040494900

ABSTRACT:
A cellulose containing vegetable material is bleached by the steps of chlorinating said material, followed by ammonia treatment and post bleaching with washing stages between said steps. Waste waters resulting from the washing stages are purified by subjecting said waste waters to electrodialysis and recovering ammonium chloride from the purified waste waters. The recovered ammonium chloride is used to pre-treat the cellulose material prior to chlorination thereof and the purified waste waters are reused in the washing stages.

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patent: 3909344 (1975-09-01), Lukes
patent: 3986951 (1976-10-01), Fremont

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