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<p>This study investigated the potential of <i>Sargassum horneri</i>, a brown algal biomass, as a feedstock for biohydrogen production through dilute acid pretreatment to release fermentable sugars. By optimizing process parameters with the use of a central composite design coupled with response surface methodology, this study determined the optimum conditions for this process, including a temperature of 129.7&#xa0;°C, an acid concentration of 2.9%&#xa0;(v/v), and a reaction time of 154.6&#xa0;min, resulting in a total sugar recovery of 15.11 ± 0.37&#xa0;g/L. During dark fermentation, a maximum hydrogen yield of 0.95 ± 0.04&#xa0;mol H<sub>2</sub>/mol sugar<sub>consumed</sub> and cumulative hydrogen production of 184.10 ± 3.17&#xa0;mL under the predicted optimum hydrolysis conditions. The modified Gompertz model was applied to evaluate the kinetics of hydrogen production. Validation of the experimental data against model predictions demonstrated good agreement, reinforcing the reliability of the model. Microbial analysis revealed the involvement of <i>Clostridium</i> sp., <i>Terrisporobacter</i> sp., and <i>Bacillus</i> sp. as dominant microorganisms in hydrogen production fermentation. Notably, <i>Paenibacillus</i> and <i>Terrisporobacter</i> were identified as major producers of acetate and hydrogen. Overall, this study underscores the potential of brown algal biomass as a renewable resource for hydrogen production, and the effectiveness of employing models to guide scaled-up studies.</p> Graphical Abstract <p></p>

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Augmenting biohydrogen production from brown algal biomass via thermochemical pretreatment: evaluation of potential and analysis of microbial communities

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Sandhya Sompura,
  • Ju-Hyeong Jung

摘要

This study investigated the potential of Sargassum horneri, a brown algal biomass, as a feedstock for biohydrogen production through dilute acid pretreatment to release fermentable sugars. By optimizing process parameters with the use of a central composite design coupled with response surface methodology, this study determined the optimum conditions for this process, including a temperature of 129.7 °C, an acid concentration of 2.9% (v/v), and a reaction time of 154.6 min, resulting in a total sugar recovery of 15.11 ± 0.37 g/L. During dark fermentation, a maximum hydrogen yield of 0.95 ± 0.04 mol H2/mol sugarconsumed and cumulative hydrogen production of 184.10 ± 3.17 mL under the predicted optimum hydrolysis conditions. The modified Gompertz model was applied to evaluate the kinetics of hydrogen production. Validation of the experimental data against model predictions demonstrated good agreement, reinforcing the reliability of the model. Microbial analysis revealed the involvement of Clostridium sp., Terrisporobacter sp., and Bacillus sp. as dominant microorganisms in hydrogen production fermentation. Notably, Paenibacillus and Terrisporobacter were identified as major producers of acetate and hydrogen. Overall, this study underscores the potential of brown algal biomass as a renewable resource for hydrogen production, and the effectiveness of employing models to guide scaled-up studies.

Graphical Abstract