Modeling of optimal green liquor pretreatment for enhanced biomass saccharification and delignification by distinct alteration of wall polymer features and biomass porosity in Miscanthus

被引:59
作者
Alam, Aftab [1 ,2 ,3 ]
Wang, Youmei [1 ,2 ,4 ]
Liu, Fei [1 ,2 ,3 ]
Kang, Heng [1 ,2 ,3 ]
Tang, Shang-wen [3 ]
Wang, Yanting [1 ,2 ,3 ]
Cai, Qiuming [1 ,2 ]
Wang, Hailang [1 ,2 ]
Peng, Hao [1 ,2 ,3 ]
Li, Qian [1 ,2 ,3 ]
Zeng, Yajun [1 ,2 ,3 ]
Tu, Yuanyuan [1 ,2 ,3 ]
Xia, Tao [1 ,3 ,4 ]
Peng, Liangcai [1 ,2 ,3 ]
机构
[1] Huazhong Agr Univ, Biomass & Bioenergy Res Ctr, Wuhan 430070, Hubei, Peoples R China
[2] Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan 430070, Hubei, Peoples R China
[3] Hubei Univ Arts & Sci, Lab Biomass Engn & Nanomat Applicat Automobiles, Coll Food Sci & Chem Engn, Xiangyang, Peoples R China
[4] Huazhong Agr Univ, Coll Life Sci & Technol, Wuhan 430070, Hubei, Peoples R China
基金
美国国家科学基金会;
关键词
Green liquor pretreatment; Biomass saccharification; Delignification; Biomass porosity; Biofuels; ALKALINE HYDROGEN-PEROXIDE; ENZYMATIC SACCHARIFICATION; ETHANOL-PRODUCTION; LIGNIN; LIGNOCELLULOSE; CELLULOSE; DIGESTIBILITY; FRACTIONATION; HYDROLYSIS; ORGANOSOLV;
D O I
10.1016/j.renene.2020.06.013
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Miscanthus is a leading bioenergy crop with enormous biomass resource convertible into bioethanol and biochemicals. However, lignocellulose recalcitrance basically causes costly bioethanol production with potential secondary pollution to the environment. In this study, the green liquor (mixed sodium carbonate and sodium sulfide) pretreatments were optimized using response surface methodological modeling for enhancing biomass saccharification and delignification in Miscanthus. By comparison, the optimal saccharification approach led to relatively higher hexose yield of 87% (% cellulose) for bioethanol yield of 17.1% (% dry matter) with the sugar-ethanol conversion rate at 98%, whereas the optimal delignification approach could achieve the highest delignification rate at 93% potential for lignin-derived biofuel or value-added biochemicals. Notably, those two optimized pretreatments could distinctively extract hemicellulose-lignin complex and altered wall polymer features, leading to much increased cellulose accessibility for efficient biomass enzymatic hydrolysis. Exceptionally, the optimal delignification led to decreased biomass porosity accountable for relatively lower hexose yield, suggesting that its cellulose microfibrils may be aggregated from excessive non-cellulosic polymers extraction. Hence, this study has demonstrated two optional strategies for green-like and cost-effective biofuels and biochemical production in Miscanthus and other bioenergy crops. (c) 2020 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1128 / 1138
页数:11
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