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Appl. Environ. Microbiol., Jan 1995, 222-225, Vol 61, No. 1
Copyright © 1995, American Society for Microbiology

Biological degradation of resin acids in wood chips by wood-inhabiting fungi

Z Wang, T Chen, Y Gao, C Breuil and Y Hiratsuka
Department of Wood Science, University of British Columbia, Vancouver, Canada.

Resin acids in many pulp mill effluents are primary sources of toxicity to fish. Inconsistent biological detoxification of chlorinated and nonchlorinated resin acids in secondary treatment of pulp mill effluents is a continuing source of concern. An alternative approach to effluent detoxification is to remove or modify the toxic compounds present in wood chips prior to pulping. Results from experiments in which lodgepole pine sapwood chips were inoculated with several fungal candidates indicate that the total resin acid content can be reduced by up to 67% after fungal growth. Such a treatment could be an efficient and environmentally acceptable way for deresinating wood chips and so decreasing the toxicity of pulp mill effluents.

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