Abstract
White rot fungus IZU-154, which more extensively and selectively degrades wood lignin than other fungi, was applied to mechanical pulping process and bleaching process for unbleached kraft pulp.The fungal treatment of coarse hardwood and softwood mechanical pulp with IZU-154reduced refiningenergyrequirements by about 2/3 and 1/3, respectively, and improved pulp strength properties. Combinedfungal and chemical bleaching process could significantly reduce the total effective chlorine andthe pollution load of waste liquors in comparison with the conventional bleaching process. Furthermore, unbleached hardwood kraft pulp (HWKP) was biobleached with partially purified manganese peroxidase (MnP) which plays the most important role in biobleaching of HWKP by white rot fungi. The totaleffective chlorine required to obtain a pulp of 85% brightness by chlorine-basedchemical bleaching afterrepeated MnP treatments was reduced to 70% for HWKP compared to the conventional bleachingprocess without introducing MnP treatments.
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