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Identifying local gradients in methane-producing biocathodes.

Micaela Brandão Lavender1, Jasper P Groot2, Annemiek Ter Heijne2

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Methane-producing bioelectrochemical systems (BES) show promise for converting CO2. This study investigated local conditions within granular activated carbon biocathodes, revealing critical hydrogen and pH gradients that impact efficiency.

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Area of Science:

  • Electrochemistry
  • Microbiology
  • Environmental Science

Background:

  • Methane-producing bioelectrochemical systems (BES) offer a sustainable route for converting carbon dioxide (CO2) and electricity into methane (CH4).
  • Granular activated carbon (GAC) is frequently employed as a 3D electrode material in these systems, but understanding local conditions within the GAC is crucial for optimization.
  • Limited knowledge exists regarding gradients and their impact on performance within CH4-producing biocathodes.

Purpose of the Study:

  • To investigate local conditions, including hydrogen (H2), pH, and oxidation-reduction potential (ORP), within GAC biocathodes.
  • To identify potential limitations and gradients affecting the efficiency of CH4 production in BES.
  • To provide insights for improving reactor design and process conditions.

Main Methods:

  • In-situ measurements of H2, pH, and ORP at various depths and heights within the GAC biocathode.
  • Utilizing a cathode potential of -0.63 V (versus Ag/AgCl) for H2 detection.
  • Analysis of gas outlet for H2 presence to infer biological utilization.

Main Results:

  • Local detection of H2 within the GAC biocathode at -0.63 V, with no H2 detected in the outlet gas, indicating efficient biological conversion.
  • Significant gradients in H2, pH, and ORP were observed across different depths of the biocathode.
  • These findings suggest that H2 acts as a crucial mediator and that localized pH 'dead zones' can impede biological activity.

Conclusions:

  • Optimizing CH4 production in BES requires addressing the identified H2 and pH gradients within the biocathode.
  • H2 should be considered a key mediator in the conversion process.
  • Targeted improvements in reactor design and operational parameters are necessary to mitigate limitations imposed by these gradients and enhance overall system efficiency.