Effect of operational parameters on Coulombic efficiency in bioelectrochemical systems

T.H.J.A. Sleutels, L. Darus, H.V.M. Hamelers, C.J.N. Buisman

Research output: Contribution to journalArticleAcademicpeer-review

106 Citations (Scopus)

Abstract

To create an efficient bioelectrochemical system, a high Coulombic efficiency is required. This efficiency is a direct measure for the competition between electrogens and methanogens when acetate is used as substrate. In this study the Coulombic efficiency in a microbial electrolysis cell was investigated. As a result of an increase in substrate concentration from 1 to 35 mM, the current density increased to 21.1 A/m(2), while the Coulombic efficiency decreased to 52%. As a result of an increase in anode potential from -450 to -0.250 mV, the current density increased to 20.9 A/m(2), while the Coulombic efficiency increased 21%. Knowledge about the substrate affinity and growth kinetics is crucial to control the Coulombic efficiency. Further research is required to optimize strategies to find a balance between the Coulombic efficiency, current density and removal rate of organic material.
Original languageEnglish
Pages (from-to)11172-11176
JournalBioresource Technology
Volume102
Issue number24
DOIs
Publication statusPublished - 2011

Keywords

  • microbial fuel-cells
  • electricity-generation
  • electrolysis cells
  • hydrogen
  • acetate
  • resistance
  • transport
  • bacteria
  • cultures
  • methane

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