Journal
RSC ADVANCES
Volume 9, Issue 20, Pages 11558-11566Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ra01555h
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Funding
- Natural Science Foundation of China [31870568, 21676114, 31700509]
- Major Program of Shandong Province Natural Science Foundation [ZR2018ZB0208]
- Six Talent Peaks Project of Jiangsu Province [SWYY-011]
- Transformational Technologies for Clean Energy and Demonstration, Strategic Priority Research Program of the Chinese Academy of Sciences [XDA21060201]
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Corncob residue (CCR) is an economic feedstock with enormous potential for the production of bioethanol. In this work, potassium hydroxide (KOH) pretreatment of CCR was investigated under relatively mild conditions, and the effectiveness of KOH pretreatment was evaluated by enzymatic saccharification at high solid loading. Results showed that after KOH pretreatment (16 wt% KOH dosage at 70 degrees C for 90 min) and the enzymatic hydrolysis at 20% solids loading and 20 FPU g(-1)-substrate of cellulase loading, the glucose yield could reach up to about 91%, which was over 90% higher compared to the raw CCR without KOH pretreatment. Correspondingly, about 89% of lignin and 79% of extractives were removed after KOH pretreatment. In addition, the spent liquor of KOH pretreatment containing sylvite could be used as lignin-based fertilizer based on the concept of biorefinery. In this case, the entire process for the production of fermentable sugars was clean and sustainable, which is very vital for the conversion of lignocelluloses to bioenergy or chemicals.
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