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Synergistic parameter optimization Unlocks High-Efficiency H2/CO2 Bio-methanation: Decoupling mass transfer

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Optimizing agitation and gas recirculation in CO2 biomethanation significantly boosts hydrogen mass transfer and methane production. Adjusting the H2/CO2 ratio enhances methanogenesis, improving renewable energy storage and carbon neutrality goals.

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Area of Science:

  • Biotechnology and Bioengineering
  • Renewable Energy Systems
  • Environmental Science

Background:

  • CO2 biomethanation is vital for renewable energy storage and carbon neutrality.
  • Inefficient gas-liquid mass transfer and suboptimal parameters limit H2/CO2 biomethanation.
  • Understanding engineering impacts on biomethanation is crucial for industrial application.

Purpose of the Study:

  • To investigate the synergistic effects of agitation, gas recirculation, and H2/CO2 ratio on in-situ H2/CO2 biomethanation.
  • To elucidate the mechanisms behind these parameter influences on process performance.
  • To provide insights for optimizing biomethanation systems for Power-to-Gas applications.

Main Methods:

  • Mesophilic biomethanation experiments at 37°C ± 1°C.
  • Systematic variation of agitation intensity (up to 160 rpm) and gas recirculation rate (up to 1200 mL·min⁻¹).
  • Optimization of H2/CO2 feed ratio and analysis using high-throughput sequencing.

Main Results:

  • Enhanced agitation and recirculation significantly improved H2 mass transfer (kLa) and volumetric methane production (VMP) to 0.97 L·L⁻¹·d⁻¹.
  • An H2/CO2 ratio of 5:1 increased methane content by ~15% and enriched hydrogenotrophic methanogens.
  • Intensified mass transfer shifted microbial communities, favoring methanogens over hydrolytic/acidogenic bacteria.

Conclusions:

  • Optimized hydrodynamics and H2/CO2 ratios are critical for efficient H2/CO2 biomethanation.
  • Mass transfer enhancement selectively enriches key microbial players, impacting overall system function.
  • Findings offer practical guidance for scaling up stable and efficient biomethanation for industrial Power-to-Gas applications.