Bioelectrochemical methane (CH4) production in anaerobic digestion at different supplemental voltages

Kwang Soon Choi, Sanath Kondaveeti, Booki Min

Research output: Contribution to journalArticlepeer-review

85 Citations (Scopus)

Abstract

Microbial electrolysis cells (MECs) at various cell voltages (0.5, 0.7 1.0 and 1.5 V) were operated in anaerobic fermentation. During the start-up period, the cathode potential decreased from −0.63 to −1.01 V, and CH4 generation increased from 168 to 199 ml. At an applied voltage of 1.0 V, the highest methane yields of 408.3 ml CH4/g COD glucose was obtained, which was 30.3% higher than in the control tests (313.4 ml CH4/g COD glucose). The average current of 5.1 mA was generated at 1.0 V at which the maximum methane yield was obtained. The other average currents were 1.42, 3.02, 0.53 mA at 0.5, 0.7, and 1.5 V, respectively. Cyclic voltammetry and EIS analysis revealed that enhanced reduction currents were present at all cell voltages with biocatalyzed cathode electrodes (no reduction without biofilm), and the highest value was obtained with 1 V external voltage.

Original languageEnglish
Pages (from-to)826-832
Number of pages7
JournalBioresource Technology
Volume245
DOIs
Publication statusPublished - 2017

Keywords

  • Acetate
  • Anaerobic digestion
  • CO conversion
  • Methane
  • Microbial electrolysis cell

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