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<p>Batch anaerobic digestion (AD) processes exhibit significant fluctuations in biogas yield from the mesophyll (SL-MPL) and midrib (SL-MRB) components of sugarcane leaf (SL), constraining overall SL utilization efficiency. To elucidate the underlying mechanisms and dynamics of AD for different SL components, this study investigated microbial community dynamics associated with biogas production from SL-MPL and SL-MRB. Results indicated that peak methane production rates reached 123.1 mL/(L·day) on day 2 for SL-MRB and 183.8 mL/(L·day) on day 3 for SL-MPL, with &gt; 85% cumulative biogas and methane production achieved by day 22. Ultimate methane yields reached 56.9 mL/g volatile solids (VS) and 118.9 mL/g VS for SL-MRB and SL-MPL, respectively. Among tested models, the first-order kinetic model provided optimal fit to experimental methane production data from SL-MRB and SL-MPL, outperforming modified Gompertz and logistic models. Microbial community analysis revealed divergent relative abundances of key bacteria taxa (including <i>Alloprevotella</i>, <i>Bacteroides</i>, and <i>Odoribacter)</i> between SL-MRB and SL-MPL. Furthermore, methanogenic archaea communities demonstrated distinct distribution patterns: SL-MRB was dominated by <i>Methanosaeta</i> while SL-MRB featured <i>Methanospirillum</i>. This study elucidates the detailed micro- and macro-environmental conditions associated with fluctuating and stable AD phases for different SL components, providing valuable insights for optimizing industrial-scale SL digestion.</p>

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Kinetic Analysis and Microbial Community Dynamics of Biogas Production from Different Components of Sugarcane Leaf

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Bing Lu,
  • Xiuping Li,
  • Tingting Peng,
  • Lang Zhou,
  • Zhenchong Li,
  • Shiyou Pan,
  • Yutuo Wei

摘要

Batch anaerobic digestion (AD) processes exhibit significant fluctuations in biogas yield from the mesophyll (SL-MPL) and midrib (SL-MRB) components of sugarcane leaf (SL), constraining overall SL utilization efficiency. To elucidate the underlying mechanisms and dynamics of AD for different SL components, this study investigated microbial community dynamics associated with biogas production from SL-MPL and SL-MRB. Results indicated that peak methane production rates reached 123.1 mL/(L·day) on day 2 for SL-MRB and 183.8 mL/(L·day) on day 3 for SL-MPL, with > 85% cumulative biogas and methane production achieved by day 22. Ultimate methane yields reached 56.9 mL/g volatile solids (VS) and 118.9 mL/g VS for SL-MRB and SL-MPL, respectively. Among tested models, the first-order kinetic model provided optimal fit to experimental methane production data from SL-MRB and SL-MPL, outperforming modified Gompertz and logistic models. Microbial community analysis revealed divergent relative abundances of key bacteria taxa (including Alloprevotella, Bacteroides, and Odoribacter) between SL-MRB and SL-MPL. Furthermore, methanogenic archaea communities demonstrated distinct distribution patterns: SL-MRB was dominated by Methanosaeta while SL-MRB featured Methanospirillum. This study elucidates the detailed micro- and macro-environmental conditions associated with fluctuating and stable AD phases for different SL components, providing valuable insights for optimizing industrial-scale SL digestion.