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<p>Decreasing CO<sub>2</sub> emissions via carbon capture and utilization (CCU) is an essential approach in combating climate change; however, research and application areas remain relatively constrained. In this context, the use of CO<sub>2</sub> for bioenergy generation offers the opportunity to reduce CO<sub>2</sub> emissions while also serving as a sustainable resource. Biomethane production from CO<sub>2</sub> and H<sub>2</sub> is seen as a promising solution for capturing carbon released into the atmosphere during anaerobic digestion processes, but the low solubility of hydrogen constitutes a bottleneck in this process. This study investigated the use of H<sub>2</sub>-based CO<sub>2</sub> biomethanation for CO<sub>2</sub> capture and conversion. By employing an anaerobic membrane biofilm reactor, H₂ utilization efficiency was effectively complete (&gt; 99%), a H<sub>2</sub> gas–liquid mass transfer rate of 0.20 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({L}_{{H}_{2}}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>L</mi> <msub> <mi>H</mi> <mn>2</mn> </msub> </msub> </math></EquationSource> </InlineEquation>/<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({L}_{R.d}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>L</mi> <mrow> <mi>R</mi> <mo>.</mo> <mi>d</mi> </mrow> </msub> </math></EquationSource> </InlineEquation> was achieved during a 3-day gas residence time, and methane production efficiency reached 83%. These results imply that the membrane biofilm reactor overcomes the bottleneck of low H<sub>2</sub> solubility. Additionally, the anaerobic membrane biofilm reactor system achieved a remarkable increase in H₂ utilization efficiency (&gt; 99%), compared to conventional systems (70–90%).</p>

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Anaerobic membrane biofilm reactor offers an opportunity against low H2 solubility for the ex-situ methanation process

  • 期刊论文

  • 发表日期：

    2026年1月16日

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  • M. Kozak,
  • E. O. Köroğlu,
  • Z. Zaimoğlu,
  • K. Cirik

摘要

Decreasing CO2 emissions via carbon capture and utilization (CCU) is an essential approach in combating climate change; however, research and application areas remain relatively constrained. In this context, the use of CO2 for bioenergy generation offers the opportunity to reduce CO2 emissions while also serving as a sustainable resource. Biomethane production from CO2 and H2 is seen as a promising solution for capturing carbon released into the atmosphere during anaerobic digestion processes, but the low solubility of hydrogen constitutes a bottleneck in this process. This study investigated the use of H2-based CO2 biomethanation for CO2 capture and conversion. By employing an anaerobic membrane biofilm reactor, H₂ utilization efficiency was effectively complete (> 99%), a H2 gas–liquid mass transfer rate of 0.20 \({L}_{{H}_{2}}\) L H 2 / \({L}_{R.d}\) L R . d was achieved during a 3-day gas residence time, and methane production efficiency reached 83%. These results imply that the membrane biofilm reactor overcomes the bottleneck of low H2 solubility. Additionally, the anaerobic membrane biofilm reactor system achieved a remarkable increase in H₂ utilization efficiency (> 99%), compared to conventional systems (70–90%).