Design approach and performance of a scalable granular packed bed biofilter for electro-fermentation

Bioelectrochemical systems (BES) represent a promising technology for the production of energy, energy carriers, and chemicals; however, their implementation in industrial applications faces significant challenges related to scalability. In this study, we introduce a novel, scalable, single-chamber BES in which the working electrode is realised as a packed bed of electrically conductive equal-sized spheres made from a graphite-polymer composite. The reactor has a total volume of 3.56 L and a packed bed volume of 1.66 L with an electrode surface area of 1.06 m². A model microbial electrolysis / electro-fermentation of lactate to acetate was catalysed by the exoelectrogenic bacterium Shewanella oneidensis , achieving a maximum current density of 430 mA m<sup>-2</sup> at an anode potential of 300 mV relative to the standard hydrogen electrode.

Subjects

Electro-fermentation

Microbial electrolysis cell (MEC)

Packed-bed BES reactor

Shewanella oneidensis

DDC Class

660.6: Biotechnology

Lizenz

https://creativecommons.org/licenses/by/4.0/

Publication version

publishedVersion

Name

1-s2.0-S2590123026025971-main.pdf

Type

Main Article

Size

5.8 MB

Format

Adobe PDF

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Design approach and performance of a scalable granular packed bed biofilter for electro-fermentation