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Efficiency and process development for microbial biomass production using oxic bioelectrosynthesis.

Leonie Rominger1, Max Hackbarth2, Tobias Jung3

  • 1Institute of Technical Microbiology, Hamburg University of Technology (TUHH), Kasernenstraße 12 (F), 21073 Hamburg, Germany.

Trends in Biotechnology
|December 13, 2024
PubMed
Summary

Oxic microbial electrosynthesis (OMES) using Kyrpidia spormannii offers efficient biomass production without explosive gas mixtures. This process achieves high electron efficiency, paving the way for diverse bioproducts beyond traditional fermentation.

Keywords:
Kyrpidia spormanniicoulombic efficiencyenergy efficiencyhydrogen-oxidizing bacteriaoxic microbial electrosynthesis (OMES)

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Area of Science:

  • Microbiology
  • Biotechnology
  • Electrochemistry

Background:

  • Autotrophic microbial electrosynthesis (MES) typically uses CO2 as an electron acceptor, resulting in low biomass yields.
  • Limited data exists on the efficiency and application of oxic MES (OMES).

Purpose of the Study:

  • To investigate biomass formation and energy efficiency of cathode-dependent growth using Kyrpidia spormannii in an OMES process.
  • To compare OMES with conventional gas fermentation and explore its potential for producing valuable bioproducts.

Main Methods:

  • Utilized the knallgas bacterium Kyrpidia spormannii for cathode-dependent growth.
  • Quantified biomass formation and determined energy efficiency under oxic conditions.

Main Results:

  • OMES achieved comparable electron efficiency to conventional gas fermentation.
  • The process avoids the use of hazardous, explosive gas mixtures.
  • Solar energy demand was calculated at 67.89 kWh kg-1 dry biomass, considering only electrical energy input.

Conclusions:

  • OMES using Kyrpidia spormannii is a viable alternative to anaerobic MES for biomass production.
  • OMES expands the range of achievable products to include protein for food/feed and other complex biomolecules.
  • This technology offers a safer and potentially more versatile approach to microbial electrosynthesis.