Bleaching kraft pulps with white-rot fungi

Conference · Tue Oct 01 00:00:00 EDT 1996

OSTI ID:370075

Reid, I D; Paice, M G; Bourbonnais, R ^[1]

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1. Pulp and Paper Research Institute, Quebec (Canada); and others

Certain white-rot fungi, notably Trametes versicolor, Phanerochaete sordida, and isolate IZU-154 can lower the residual lignin content and increase the brightness of kraft pulps without damaging the pulps` strength or yield. This biological delignification effect can be used in Elemental Chlorine Free and Totally Chlorine Free bleaching sequences. Physical contact between the fungal hyphae and the pulp fibers is not required, but the presence of the living fungus is necessary for continued delignification. In many but not a systems, delignification is correlated with manganese peroxidase activity. Experiments with pulps containing {sup 14}C-labelled lignin indicate that the residual lignin is solubilized, but not extensively mineralized, by T. versicolor. The solubilized lignin has the same molecular size as the residual lignin originally present in the pulp. Demethylation of the phenolic rings in the pulp is an early effect of incubation with the fungus.

• OSTI ID: 370075
• Report Number(s): CONF-960376--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
55 BIOLOGY AND MEDICINE
BASIC STUDIES
BIOMASS
BIOTECHNOLOGY
BLEACHING
BRIGHTNESS
CHLORINE
DELIGNIFICATION
ENERGY EFFICIENCY
ENZYME ACTIVITY
FIBERS
FUNGI
LIGNIN
PEROXIDASES
PHANEROCHAETE
POLLUTION ABATEMENT
PROCESSING
SPENT LIQUORS
WOOD PRODUCTS INDUSTRY