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Recycle of the Oxygen Delignification Filtrate to the Recovery Cycle at Acid Sulphite Mills: Technical Feasibility


April 1, 2010
By Pulp & Paper Canada

Recyclage du filtrat de dlignification d’oxygne au cycle de rcupration dans les usines bisulfiteff: faisabilit technique

Recyclage du filtrat de dlignification d’oxygne au cycle de rcupration dans les usines bisulfiteff: faisabilit technique

Abstract: In acid sulphite mills the recycle of oxygen delignification filtrate to the recovery cycle can not be implemented

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unless sodium ions are removed. Sodium, a non-process element, causes plugging of the flue gas passages in the recovery furnace. We used cation-exchange technology and removed 99% of the sodium ions from oxygen delignification filtrates. The recovery of BOD and COD was higher than 90%. Recycling the sodium- free filtrate to the recovery cycle offloads the effluent treatment system, increases steam production and reduces fresh water consumption.

Paper presented at the PAPTAC 95th Annual Meeting in Montreal, Que., February 3-4, 2009.

Keywords: SULPHITE MILLS, DELIGNIFICATION, FILfi TRATES, RECYCLING, RECOVERY, ACID PULPING, CLOSED CYCLE, ION EXCHANGE.

Full manuscript available at www.paptac.ca.


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