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Purpose <p>Relationship between composition, and hydrolyzability of lignocellulosic biomass and performance of anaerobic co-digestion was evaluated.</p> Methods <p>Cow manure and lignocellulosic biomass (office paper, cardboard, rice straw, and sawdust) were co-digested at 37&#xa0;°C, and the first-order hydrolysis rate constant (<i>k</i><sub><i>h</i></sub>), maximum cumulative CH<sub>4</sub> yield (<i>P</i>) and maximum CH<sub>4</sub> production rate (<i>R</i><sub><i>m</i></sub>) were estimated. Enzymatic hydrolysis test was also performed to estimate the first-order reaction rate constant of enzymatic hydrolysis (<i>k</i><sub><i>e</i></sub>).</p> Results <p><i>P</i> and <i>R</i><sub><i>m</i></sub> were 110 ± 31.2 − 314 ± 34.3 mL g VS<sup>− 1</sup> and 6.37 ± 0.83 − 50.2 ± 9.88 mL g VS<sup>− 1</sup> day<sup>− 1</sup>, respectively; the values of both parameters were highest for office paper, followed by cardboard, rice straw, and sawdust. <i>k</i><sub><i>e</i></sub> was 0.127 − 1.16 day<sup>− 1</sup>, and was highest for paper biomass than for rice straw and sawdust. <i>k</i><sub><i>h</i></sub> was 0.0855 ± 0.015 − 0.189 ± 0.030 day<sup>− 1</sup>, and was positively correlated with <i>k</i><sub><i>e</i></sub>. <i>P</i> was negatively correlated with the lignin content of the mixed substrate and positively correlated with the glucose yield of enzymatic hydrolysis. <i>R</i><sub><i>m</i></sub> was correlated with the cellulose + hemicellulose content of the mixed substrate, and with <i>k</i><sub><i>h</i></sub> and <i>k</i><sub><i>e</i></sub>, suggesting that hydrolysis of lignocellulosic biomass is the rate-limiting step.</p> Conclusion <p>Biomass composition and hydrolyzability are useful parameters to predict <i>P</i> and <i>R</i><sub><i>m</i></sub>.</p> Graphical Abstract <p></p>

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Effect of the Composition and Hydrolyzability of Lignocellulosic Biomass on Methane Productivity in Co-Anaerobic Digestion of Lignocellulosic Biomass and Cow Manure

  • 期刊论文

  • 发表日期：

    2025年6月3日

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  • Shohei Riya,
  • Teppei Nitta,
  • Akihiko Terada

摘要

Purpose

Relationship between composition, and hydrolyzability of lignocellulosic biomass and performance of anaerobic co-digestion was evaluated.

Methods

Cow manure and lignocellulosic biomass (office paper, cardboard, rice straw, and sawdust) were co-digested at 37 °C, and the first-order hydrolysis rate constant (kh), maximum cumulative CH4 yield (P) and maximum CH4 production rate (Rm) were estimated. Enzymatic hydrolysis test was also performed to estimate the first-order reaction rate constant of enzymatic hydrolysis (ke).

Results

P and Rm were 110 ± 31.2 − 314 ± 34.3 mL g VS− 1 and 6.37 ± 0.83 − 50.2 ± 9.88 mL g VS− 1 day− 1, respectively; the values of both parameters were highest for office paper, followed by cardboard, rice straw, and sawdust. ke was 0.127 − 1.16 day− 1, and was highest for paper biomass than for rice straw and sawdust. kh was 0.0855 ± 0.015 − 0.189 ± 0.030 day− 1, and was positively correlated with ke. P was negatively correlated with the lignin content of the mixed substrate and positively correlated with the glucose yield of enzymatic hydrolysis. Rm was correlated with the cellulose + hemicellulose content of the mixed substrate, and with kh and ke, suggesting that hydrolysis of lignocellulosic biomass is the rate-limiting step.

Conclusion

Biomass composition and hydrolyzability are useful parameters to predict P and Rm.

Graphical Abstract