Competition between methanogens and acetogens in biocathodes: A comparison between potentiostatic and galvanostatic control

Sam D. Molenaar, Pradip Saha, Annemerel R. Mol, Tom H.J.A. Sleutels, Annemiek ter Heijne, Cees J.N. Buisman

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Abstract

Microbial electrosynthesis is a useful form of technology for the renewable production of organic commodities from biologically catalyzed reduction of CO2. However, for the technology to become applicable, process selectivity, stability and efficiency need strong improvement. Here we report on the effect of different electrochemical control modes (potentiostatic/galvanostatic) on both the start-up characteristics and steady-state performance of biocathodes using a non-enriched mixed-culture inoculum. Based on our results, it seems that kinetic differences exist between the two dominant functional microbial groups (i.e., homoacetogens and methanogens) and that by applying different current densities, these differences may be exploited to steer product selectivity and reactor performance.

LanguageEnglish
Article number204
JournalInternational Journal of Molecular Sciences
Volume18
Issue number1
DOIs
Publication statusPublished - 19 Jan 2017

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Methanogens
selectivity
inoculum
Technology
commodities
electrochemical synthesis
Current density
reactors
current density
Kinetics
kinetics
products

Keywords

  • Acetate
  • Acetogen
  • Biocathode
  • Bioelectrochemical systems (BES)
  • Competition
  • Current density
  • Kinetics
  • Methanogen
  • Microbial electrosynthesis (MES)
  • Thermodynamics

Cite this

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abstract = "Microbial electrosynthesis is a useful form of technology for the renewable production of organic commodities from biologically catalyzed reduction of CO2. However, for the technology to become applicable, process selectivity, stability and efficiency need strong improvement. Here we report on the effect of different electrochemical control modes (potentiostatic/galvanostatic) on both the start-up characteristics and steady-state performance of biocathodes using a non-enriched mixed-culture inoculum. Based on our results, it seems that kinetic differences exist between the two dominant functional microbial groups (i.e., homoacetogens and methanogens) and that by applying different current densities, these differences may be exploited to steer product selectivity and reactor performance.",
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AU - Sleutels, Tom H.J.A.

AU - ter Heijne, Annemiek

AU - Buisman, Cees J.N.

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AB - Microbial electrosynthesis is a useful form of technology for the renewable production of organic commodities from biologically catalyzed reduction of CO2. However, for the technology to become applicable, process selectivity, stability and efficiency need strong improvement. Here we report on the effect of different electrochemical control modes (potentiostatic/galvanostatic) on both the start-up characteristics and steady-state performance of biocathodes using a non-enriched mixed-culture inoculum. Based on our results, it seems that kinetic differences exist between the two dominant functional microbial groups (i.e., homoacetogens and methanogens) and that by applying different current densities, these differences may be exploited to steer product selectivity and reactor performance.

KW - Acetate

KW - Acetogen

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KW - Current density

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KW - Methanogen

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