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Hydrogen-driven microbial biogas upgrading: Advances, challenges and solutions.

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Microbial technologies upgrade biogas by removing carbon dioxide (CO2) using hydrogen (H2) from renewable sources. This review explores challenges and strategies for efficient CO2 conversion to biomethane, offering sustainable energy solutions.

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Area of Science:

  • Biotechnology
  • Renewable Energy
  • Environmental Science

Background:

  • Biogas is a renewable energy source, but high carbon dioxide (CO2) content reduces its fuel value.
  • Biogas upgrading converts biogas to biomethane, increasing its commercial value and applicability.
  • Microbial technologies offer a sustainable and cost-effective method for biogas upgrading.

Purpose of the Study:

  • To comprehensively review current biogas generation and utilization.
  • To describe advances in biological, hydrogen (H2)-dependent biogas upgrading.
  • To identify key challenges and new strategies for efficient CO2 conversion.

Main Methods:

  • Review of existing literature on microbial biogas upgrading.
  • Analysis of hydrogenotrophic methanogens and homoacetogens for CO2 conversion.
  • Examination of strategies to overcome metabolic limitations and improve H2 transfer.

Main Results:

  • Biological H2-dependent biogas upgrading faces challenges like metabolic limitations and low H2 transfer rates.
  • Process optimization, novel reactor designs, and genetic engineering are key strategies for improvement.
  • Efficient CO2 conversion is achievable through advanced microbial and engineering approaches.

Conclusions:

  • Microbial H2-driven biogas upgrading is a promising technology for sustainable energy.
  • Addressing technical barriers is crucial for efficient CO2 conversion and biomethane production.
  • This approach can contribute to mitigating the global energy crisis and climate change.