Journal
MOLECULES
Volume 25, Issue 15, Pages -Publisher
MDPI
DOI: 10.3390/molecules25153396
Keywords
biorefineries; enzymatic hydrolysis; fermentable sugars; hybrid poplar; wet explosion pretreatment
Funding
- USDA's NARA project
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Wet explosion pretreatment of hybrid poplar sawdust (PSD) for the production of fermentable sugar was carried out in the pilot-scale. The effects of pretreatment conditions, such as temperature (170-190 degrees C), oxygen dosage (0.5-7.5% of dry matter (DM),w/w), residence time (10-30 min), on cellulose and hemicellulose digestibility after enzymatic hydrolysis were ascertained with a central composite design of the experiment. Further, enzymatic hydrolysis was optimized in terms of temperature, pH, and a mixture of CTec2 and HTec2 enzymes (Novozymes). Predictive modeling showed that cellulose and hemicellulose digestibility of 75.1% and 83.1%, respectively, could be achieved with a pretreatment at 177 degrees C with 7.5% O(2)and a retention time of 30 min. An increased cellulose digestibility of 87.1% +/- 0.1 could be achieved by pretreating at 190 degrees C; however, the hemicellulose yield would be significantly reduced. It was evident that more severe conditions were required for maximal cellulose digestibility than that of hemicellulose digestibility and that an optimal sugar yield demanded a set of conditions, which overall resulted in the maximum sugar yield.
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