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<p>Advancing lignocellulose biorefining is imperative for the deployment of cellulosic (2G) biofuels. This work investigates the tailoring of the alkaline deacetylation and mechanical refining (DMR) pathway for the bioconversion of sugarcane bagasse. Experiments are conducted at laboratory and pilot scales, varying the pretreatment conditions (70–92&#xa0;°C; 48–100 g<sub>NaOH</sub>/kg) and the mechanical refining technologies (PFI and disk refining). The pretreatments selectively solubilize acetyl groups (&gt; 86%) and lignin (10–63%) while mostly preserving structural carbohydrates in the solid phase. Enzymatic hydrolysis generates hydrolysates of clean sugars (glucose and xylose), with sugar yields increasing up to 81% for glucose and 89% for xylose in response to delignification and mechanical refining. Biochemical methane potential assays reveal specific methane productions of up to 568 NmL CH₄ gVS⁻¹ for alkaline liquor monodigestion and 344 NmL CH₄ gVS⁻¹ for co-digestion with sugarcane vinasse from the conventional (1G) sugarcane ethanol, indicating a strong potential for bioenergy recovery from this process stream. Synergies are identified in integrating 1G ethanol, 2G<sub>DMR</sub> processing of bagasse, and anaerobic co-digestion of 1G vinasse and 2G<sub>DMR</sub> alkaline liquor. This technology enables sugarcane biorefineries to enhance the co-production of ethanol, methane, and concentrated streams of CO<sub>2</sub>.</p>

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Deacetylation and Mechanical Refining Pathway for the Bioconversion of Sugarcane Bagasse

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月24日

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  • Fernando Roberto Paz Cedeno,
  • Gustavo R. Gomes,
  • Jessica J. Silva,
  • Fabricia F. Menezes,
  • Viviane M. Nascimento,
  • George J. M. Rocha,
  • Renata P. Rodriguez,
  • Xiaowen Chen,
  • Antonio Bonomi,
  • Carlos Driemeier

摘要

Advancing lignocellulose biorefining is imperative for the deployment of cellulosic (2G) biofuels. This work investigates the tailoring of the alkaline deacetylation and mechanical refining (DMR) pathway for the bioconversion of sugarcane bagasse. Experiments are conducted at laboratory and pilot scales, varying the pretreatment conditions (70–92 °C; 48–100 gNaOH/kg) and the mechanical refining technologies (PFI and disk refining). The pretreatments selectively solubilize acetyl groups (> 86%) and lignin (10–63%) while mostly preserving structural carbohydrates in the solid phase. Enzymatic hydrolysis generates hydrolysates of clean sugars (glucose and xylose), with sugar yields increasing up to 81% for glucose and 89% for xylose in response to delignification and mechanical refining. Biochemical methane potential assays reveal specific methane productions of up to 568 NmL CH₄ gVS⁻¹ for alkaline liquor monodigestion and 344 NmL CH₄ gVS⁻¹ for co-digestion with sugarcane vinasse from the conventional (1G) sugarcane ethanol, indicating a strong potential for bioenergy recovery from this process stream. Synergies are identified in integrating 1G ethanol, 2GDMR processing of bagasse, and anaerobic co-digestion of 1G vinasse and 2GDMR alkaline liquor. This technology enables sugarcane biorefineries to enhance the co-production of ethanol, methane, and concentrated streams of CO2.