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<p>The efficient lignocellulose conversion from agriculture straw waste was critical for sustainable bioethanol production. In this study, an efficient cellulose-degrading microbial consortium was constructed to promote straw utilization and bioethanol production. Seven cellulose-degrading strains were screened from soil, biogas slurry and compost, and a non-antagonistic consortium consisting of SPY1, BB1, BB2 and BW2 was established. Wheat straw powder and ammonium sulfate were optimized as the best carbon and nitrogen sources for enzyme production, with the maximum filter paper enzyme activity reaching 6.85 U/mL. Under optimized saccharification conditions, the highest reducing sugar yields from corn straw and wheat straw were 25.1 and 22.1%, respectively. FTIR analysis confirmed that the enzyme system of the consortium could effectively reduce cellulose crystallinity and lignocellulose polymerization in straw. Fermentation temperature (30&#xa0;°C) showed the most significant effect on bioethanol yield, and the maximum yields from corn straw and wheat straw were 6.78% and 6.05% under optimal parameters. This study provides a novel green bioprocess for straw waste valorization, which exhibits promising potential for the industrial development of lignocellulosic bioethanol.</p> Graphical abstract <p></p>

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Enhancing Bioethanol Production from Straw Waste via an Optimized Cellulose-Degrading Microbial Consortium: Screening, Process Optimization, and Mechanistic Insights

  • 期刊论文

  • 发表日期：

    2026年7月10日

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  • Yongjing Wang,
  • Wanyun He,
  • Shanyuan He,
  • Jinglin Li,
  • Xinyu Zhang,
  • Yuxin Zhang,
  • Molin Li,
  • Luying Hou,
  • Minglu Zhang,
  • Lianhai Ren

摘要

The efficient lignocellulose conversion from agriculture straw waste was critical for sustainable bioethanol production. In this study, an efficient cellulose-degrading microbial consortium was constructed to promote straw utilization and bioethanol production. Seven cellulose-degrading strains were screened from soil, biogas slurry and compost, and a non-antagonistic consortium consisting of SPY1, BB1, BB2 and BW2 was established. Wheat straw powder and ammonium sulfate were optimized as the best carbon and nitrogen sources for enzyme production, with the maximum filter paper enzyme activity reaching 6.85 U/mL. Under optimized saccharification conditions, the highest reducing sugar yields from corn straw and wheat straw were 25.1 and 22.1%, respectively. FTIR analysis confirmed that the enzyme system of the consortium could effectively reduce cellulose crystallinity and lignocellulose polymerization in straw. Fermentation temperature (30 °C) showed the most significant effect on bioethanol yield, and the maximum yields from corn straw and wheat straw were 6.78% and 6.05% under optimal parameters. This study provides a novel green bioprocess for straw waste valorization, which exhibits promising potential for the industrial development of lignocellulosic bioethanol.

Graphical abstract