期刊
ENERGY CONVERSION AND MANAGEMENT
卷 224, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2020.113365
关键词
Modified alkaline hydrogen peroxide pretreatment; Lignin removal; Enzymatic hydrolysis; Simultaneous saccharification and fermentation
资金
- Jiangsu Province Key Laboratory of Biomass Energy and Materials [JSBEM-S-202004]
- China Postdoctoral Science Foundation [2020M670526]
- Fundamental Research Funds of CAF Enhancing Project in the Field of Wood Composite Materials and Chemical Resources Utilization [CAFYBB2017ZX003-08]
- Innovative Ability Enhancement Project for R&D Team of ICIFP, CAF [LHSXKQ8]
To overcome the typical delignification saturation point of alkaline peroxide pretreatment and further facilitate lignin removal, a novel modified alkaline hydrogen peroxide pretreatment (MAHP) was proposed by introducing ethanol into the reaction system. The dosages of H2O2, ethanol, and pretreatment temperature were optimized, and the results revealed that a maximum lignin removal as high as 79.25% could be achieved at only 100 degrees C, 3 wt % H2O2 concentration and 1 wt% ethanol concentration. Meanwhile, 76.5% of glucan and 56.0% of xylan were preserved at this pretreatment condition. By overcoming the delignification saturation point, enzymatic hydrolysis efficiency was remarkably enhanced, achieving 96.76% and 97.38% of glucan and xylan conversion, respectively, which are 7.4 and 11.4 times as compared to that of the untreated bamboo. Furthermore, the simultaneous saccharification and fermentation (SSF) result indicated an identical ethanol yield of similar to 75% when elevating the SSF solid loading from 5% to 30%. Based on the sequential SSF and xylose fermentation results, about 5.6 tons of bamboo would be consumed to produce 1 ton of ethanol. Finally, the energy balance revealed that a positive balance of 1255.4 KJ could be generated via processing 1 kg bamboo. The results demonstrate that the MAHP is a promising high-efficiency pretreatment technology for bamboo due to the mild pretreatment severity and robust ethanol yield.
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