Journal
BIORESOURCE TECHNOLOGY
Volume 241, Issue -, Pages 228-235Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.05.109
Keywords
Waste wheat straw; Bio-ethanol; Xylooligosaccharides; Prewashing; Liquid hot water pretreatment
Funding
- National Key Technology Research and Development Program of China [2015BAD15B09]
- Natural Science Foundation of Jiangsu Province for Youth [BK20150874]
- National Natural Science Foundation for Youth [31600463]
- Priority Academic Program Development of Jiangsu Higher Education Institution (PAPD)
- Doctorate Fellowship Foundation of Nanjing Forestry University
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A bio-refinery process of wheat straw pulping solid residue (waste wheat straw, WWS) was established by combining prewashing and liquid hot water pretreatment (LHWP). The results showed that employing a prewashing step prior to the LHWP remarkably improved enzymatic glucose yields from 39.7% to 76.6%. Moreover, after 96 h simultaneous saccharification and fermentation (SSF), identical ethanol yields of 0.41 g/g-cellulose were obtained despite varied solid loadings (5-30%). Beyond ethanol, enzymatic post-hydrolysis of the prehydrolyzate effectively increased xylobiose and xylotriose yields from 15 mg/g-WWS and 14 mg/g-WWS to 53 mg/g-WWS and 20 mg/g-WWS, respectively. For mass balance, about 10.9 tons raw WWS will be consumed to produce 1 ton ethanol, in addition to producing 614.8 kg xylooligosaccharides (XOS) containing 334.3 kg xylobiose and 124.8 kg xylotriose. The results demonstrated that the integrated process for the WWS bio-refinery is promising, based on value-adding coproduction in addition to robust ethanol yields. (C) 2017 Published by Elsevier Ltd.
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