Abstract
Brutia pine wood chips were pretreated with lignin degrading fungus ( Ceriporiopsis subvermispora ) and its effects on kraft pulping involved adding antraquinone (AQ) and NaBH 4 into the white liquor were studied. The results showed that pulp rejects were lower for biokraft pulp and a significant reduction was observed when biokraft process was modified by NaBH 4 compared to the control kraft method. Also, an increase on pulp yield and reduction on kappa number was noticed with biokraft pulp. Adding AQ and NaBH 4 into biopulping led to positive results with regards to pulp yield and kappa number compared to biokraft pulp. The results indicated a major increase in pulp brightness when biokraft pulping was modified with 2% NaBH 4 . On the other hand, biopulps gave lower tear but higher burst index compared to the control kraft pulp. Tensile index of the biopulps were slightly lower; however, untreated kraft pulp was found to be easier to refine and when pulps were refined to 12,000 revs. in PFI mill, biokraft-AQ pulp showed a significant improvement on tensile index.
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