Journal
BIORESOURCE TECHNOLOGY
Volume 250, Issue -, Pages 365-373Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2017.11.060
Keywords
Neutral sulfite pretreatment; Straw pulping solid residue; Bio-ethanol; Xylonic acid; Slow-release nitrogen fertilizer
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 novel bio-refinery sequence yielding varieties of co-products was developed using straw pulping solid residue. This process utilizes neutral sulfite pretreatment which under optimal conditions (160 degrees C and 3% (w/v) sulfite charge) provides 64.3% delignification while retaining 90% of cellulose and 67.3% of xylan. The pretreated solids exhibited excellent enzymatic digestibility, with saccharification yields of 86.9% and 81.1% for cellulose and xylan, respectively. After pretreatment, the process of semi-simultaneous saccharification and fermentation (S-SSF) and bio-catalysis was investigated. The results revealed that decreased ethanol yields were achieved when solid loading increased from 5% to 30%. An acceptable ethanol yield of 76.8% was obtained at 20% solid loading. After fermentation, bio-catalysis of xylose remaining in fermentation broth resulted in near 100% xylonic acid (XA) yield at varied solid loadings. To complete the co-product portfolio, oxidation ammoniation of the dissolved lignin successfully transformed it into biodegradable slow-release nitrogen fertilizer with excellent agricultural properties.
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