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

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  • Alam, Aftab
  • Wang, Youmei
  • Liu, Fei
  • Kang, Heng
  • Tang, Shang-wen
  • Wang, Yanting
  • Cai, Qiuming
  • Wang, Hailang
  • Peng, Hao
  • Li, Qian
  • Zeng, Yajun
  • Tu, Yuanyuan
  • Xia, Tao
  • Peng, Liangcai

Abstract

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.

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  • Alam, Aftab & Wang, Youmei & Liu, Fei & Kang, Heng & Tang, Shang-wen & Wang, Yanting & Cai, Qiuming & Wang, Hailang & Peng, Hao & Li, Qian & Zeng, Yajun & Tu, Yuanyuan & Xia, Tao & Peng, Liangcai, 2020. "Modeling of optimal green liquor pretreatment for enhanced biomass saccharification and delignification by distinct alteration of wall polymer features and biomass porosity in Miscanthus," Renewable Energy, Elsevier, vol. 159(C), pages 1128-1138.
    • Handle: RePEc:eee:renene:v:159:y:2020:i:c:p:1128-1138
    DOI: 10.1016/j.renene.2020.06.013
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    1. Arora, Richa & Behera, Shuvashish & Sharma, Nilesh Kumar & Kumar, Sachin, 2017. "Augmentation of ethanol production through statistically designed growth and fermentation medium using novel thermotolerant yeast isolates," Renewable Energy, Elsevier, vol. 109(C), pages 406-421.
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    1. Gao, Hairong & Wang, Yanting & Yang, Qiaomei & Peng, Hao & Li, Yuqi & Zhan, Dan & Wei, Hantian & Lu, Haiwen & Bakr, Mahmoud M.A. & EI-Sheekh, Mostafa M. & Qi, Zhi & Peng, Liangcai & Lin, Xinchun, 2021. "Combined steam explosion and optimized green-liquor pretreatments are effective for complete saccharification to maximize bioethanol production by reducing lignocellulose recalcitrance in one-year-old," Renewable Energy, Elsevier, vol. 175(C), pages 1069-1079.
    2. Chu, Qiulu & Tong, Wenyao & Wu, Shufang & Jin, Yongcan & Hu, Jinguang & Song, Kai, 2021. "Modification of lignin by various additives to mitigate lignin inhibition for improved enzymatic digestibility of dilute acid pretreated hardwood," Renewable Energy, Elsevier, vol. 177(C), pages 992-1000.
    3. Fu, Yansong & Gao, Hairong & Yu, Hua & Yang, Qiaomei & Peng, Hao & Liu, Peng & Li, Yuqi & Hu, Zhen & Zhang, Ran & Li, Jingyang & Qi, Zhi & Wang, Lingqiang & Peng, Liangcai & Wang, Yanting, 2022. "Specific lignin and cellulose depolymerization of sugarcane bagasse for maximum bioethanol production under optimal chemical fertilizer pretreatment with hemicellulose retention and liquid recycling," Renewable Energy, Elsevier, vol. 200(C), pages 1371-1381.
    4. Xie, Junxian & Cheng, Zheng & Zhu, Shiyun & Xu, Jun, 2022. "Lewis base enhanced neutral deep eutectic solvent pretreatment for enzymatic hydrolysis of corn straw and lignin characterization," Renewable Energy, Elsevier, vol. 188(C), pages 320-328.

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