期刊
BIOMASS & BIOENERGY
卷 59, 期 -, 页码 393-401出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.biombioe.2013.08.014
关键词
Forest harvest residue; Pretreatment; Enzymatic hydrolysis/saccharification; Biofuel; Pretreatment severity
资金
- Agriculture and Food Research Initiative Competitive [2011-68005-30416]
- USDA National Institute of Food and Agriculture (NIFA) through the Northwest Advanced Renewables Alliance (NARA)
Forest harvest residues can be a cost-effective feedstock for a biorefinery, but the high lignin content of forest residues is a major barrier for enzymatic sugar production. Sulfite pretreatment to overcome strong recalcitrance of lignocelluloses (SPORL) was applied to a Douglas-fir (Pseudotsuga menziesii (Mirb) Franco var. menziesii) forest residue in a range of sulfite and acid loadings at 165 degrees C for 75 mm with liquid to wood ratio of 3:1. Sodium bisulfite and sulfuric acid charge as mass fraction of oven dry biomass of 12% and 2.21%, respectively, was optimal in terms of enzymatic cellulose saccharification, sugar yield and formation of hydroxymethylfurfural (HMF) and furfural. Enzymatic glucose yield was 345 g kg(-1), or equivalent to 82.3% of theoretical at a cellulase (CTec2) dosage of 15 filter paper unit (FPU) per gram of glucan. HMF and furfural formation were low at approximately 2.5 g L-1 each in the pretreatment hydrolyzate. Delignification was important to achieve good cellulose saccharification efficiency, however, approximately 80-90% hemicellulose removal is also required. Substrate enzymatic digestibility (SED) was found to correlate to a combined parameter Z(CHF) of delignification and hemicellulose dissolution well, suggesting that the combined hydrolysis factor (CHF) - a pretreatment severity measure - can be used to predict saccharification of forest residue for scale-up studies to reduce numbers of experiments. Published by Elsevier Ltd.
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