Abstract
Previously it was shown that wood chip compression or enzyme impregnation prior to refining reduces energy consumption and improves pulp quality. This work characterizes the effect of different magnitudes and rates of compression on the extent of enzymatic hydrolysis. A laboratory compressor and a controlled uniaxial load set-up were used to apply different compression ratios and compression times to mixed-softwood wood chips. The chips were subsequently subjected to enzymatic hydrolysis with a high-yield exoglucanase preparation to demonstrate changes in cellulose hydrolysis. Enzymatic hydrolysis yield increased with compression ratio but was unaffected by compression time. Increasing compression ratio increased removal of soluble molecules such as sugars and acid-soluble lignin. Microscopy imaging showed increased cell wall buckling and fracturing with increased compression. The morphological changes led to improved enzyme diffusion and resulted in higher available surface area. The improved cellulose hydrolysis is due to changes in wood morphology as well as the removal of extractives.
Funding source: Natural Sciences and Engineering Research Council of Canada
Award Identifier / Grant number: CRDPJ 437223-12
Funding statement: This research was conducted as part of the Energy Reduction in Mechanical Pulping program, which was funded by a Collaborative Research and Development grant provided by Natural Sciences and Engineering Research Council of Canada (NSERC), Grant Number: CRDPJ 437223-12, and the following partners, who we thank for their support: AB Enzymes, Alberta Newsprint Company, Andritz, BC Hydro, Canfor, Catalyst Paper, FPInnovations, Holmen Paper, Meadow Lake Pulp (Paper Excellence), Millar Western, Norpac, West Fraser, Westcan Engineering, and Winstone Pulp International.
Acknowledgments
Special thanks to FPInnovations for assisting with the lab compressor trial. The UBC Department of Materials Engineering assisted with the MTS compression trials. AB Enzymes supplied the enzymes for this work.
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Conflict of interest: The authors declare no conflict of interest.
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