Using sulfite chemistry for robust bioconversion of Douglas-fir forest residue to bioethanol at high titer and lignosulfonate: A pilot-scale evaluation

作者：Zhu, J. Y.^*; Chandra, M. Subhosh; Gu, Feng; Gleisner, Roland; Reiner, Rick; Sessions, John; Marrs, Gevan; Gao, Johnway; Anderson, Dwight

来源：Bioresource Technology, 2015, 179: 390-397.

DOI：10.1016/j.biortech.2014.12.052

• Sulfite pulping
• Pretreatment
• High titer biofuel
• Forest residues
• Lignosulfonate

This study demonstrated at the pilot-scale (50 kg) use of Douglas-fir forest harvest residue, an underutilized forest biomass, for the production of high titer and high yield bioethanol using sulfite chemistry without solid-liquor separation and detoxification. Sulfite Pretreatment to Overcome the Recalcitrance of Lignocelluloses (SPORL) was directly applied to the ground forest harvest residue with no further mechanical size reduction, at a low temperature of 145 degrees C and calcium bisulfite or total SO2 loadings of only 6.5 or 6.6 wt% on oven dry forest residue, respectively. The low temperature pretreatment facilitated high solids fermentation of the un-detoxified pretreated whole slurry. An ethanol yield of 282 L/tonne, equivalent to 70% theoretical, with a titer of 42 g/L was achieved. SPORL solubilized approximately 45% of the wood lignin as directly marketable lignosulfonate with properties equivalent to or better than a commercial lignosulfonate, important to improve the economics of biofuel production. Published by Elsevier Ltd.

• 出版日期2015-3
• 单位南京林业大学