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<p>The recalcitrant lignocellulosic structure of corn straw poses significant challenges to its valorization through anaerobic digestion (AD), with hydrolysis remaining a key bottleneck. This study introduces a novel integrated approach combining pretreatment with hydrogen regulation to address hydrolytic and methanogenic limitations. Through <i>Trichoderma viride</i> pretreatment, leading to significant lignin degradation (74.06% reduction) and structural modification, substrate accessibility was significantly improved, resulting in a 136% increase in maximum methane production compared to untreated substrates. An advancement was achieved through orthogonal optimization (L<sub>9</sub>(3<sup>4</sup>) design) of exogenous hydrogen supplementation, identifying 60 mL H<sub>2</sub> injection for 13 min thrice daily as optimal parameters. This staged hydrogenation strategy enhanced biogas upgrading efficiency via: (1) selective enrichment of hydrogenotrophic methanogens; (2) maintaining favorable H<sub>2</sub>/CO<sub>2</sub> stoichiometry (approximately 4:1) for thermodynamic stability; (3) extending the active digestion phase by 80% (Extended from 5 to 9 days). Kinetic modeling, using a modified Gompertz equation (R<sup>2</sup> = 0.98–0.99), revealed parameters aligned with microbial shifts, with the maximum methane potential (<InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13399_2025_6782_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="45" /> </InlineMediaObject> <EquationSource Format="TEX">\(G \text{max}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>G</mi> <mtext>max</mtext> </mrow> </math></EquationSource> </InlineEquation>) reaching 132.44 mL/g TS under optimized conditions. This study demonstrates a synergistic approach to enhance lignocellulosic AD, integrating <i>Trichoderma</i> pretreatment for improved hydrolysis with optimized hydrogen supplementation for enhanced and sustained methanogenesis, offering a promising pathway for enhanced renewable biogas production from agricultural waste.</p>

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Optimizing anaerobic digestion of corn straw via exogenous hydrogen permeation adjustments Post-Trichoderma viride pretreatment

  • 期刊论文

  • 发表日期：

    2025年5月5日

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  • Xiaohong Su,
  • Ruian Lin,
  • Fuyan Shi,
  • Tao Zheng,
  • Wei Liu

摘要

The recalcitrant lignocellulosic structure of corn straw poses significant challenges to its valorization through anaerobic digestion (AD), with hydrolysis remaining a key bottleneck. This study introduces a novel integrated approach combining pretreatment with hydrogen regulation to address hydrolytic and methanogenic limitations. Through Trichoderma viride pretreatment, leading to significant lignin degradation (74.06% reduction) and structural modification, substrate accessibility was significantly improved, resulting in a 136% increase in maximum methane production compared to untreated substrates. An advancement was achieved through orthogonal optimization (L9(34) design) of exogenous hydrogen supplementation, identifying 60 mL H2 injection for 13 min thrice daily as optimal parameters. This staged hydrogenation strategy enhanced biogas upgrading efficiency via: (1) selective enrichment of hydrogenotrophic methanogens; (2) maintaining favorable H2/CO2 stoichiometry (approximately 4:1) for thermodynamic stability; (3) extending the active digestion phase by 80% (Extended from 5 to 9 days). Kinetic modeling, using a modified Gompertz equation (R2 = 0.98–0.99), revealed parameters aligned with microbial shifts, with the maximum methane potential ( \(G \text{max}\) G max ) reaching 132.44 mL/g TS under optimized conditions. This study demonstrates a synergistic approach to enhance lignocellulosic AD, integrating Trichoderma pretreatment for improved hydrolysis with optimized hydrogen supplementation for enhanced and sustained methanogenesis, offering a promising pathway for enhanced renewable biogas production from agricultural waste.