Evaluating methane and acetate production in microbial electrolysis cells: reactor performance and microbial diversity
Paper in proceedings, 2013

The work investigated the potential of microbial electrolysis cells (MECs) for methane and acetate production from synthetic wastewater. In a single-chamber MEC operating with acetate as the electron and carbon source, methane and hydrogen were the main reduction products. Acetate consumption as Chemical Oxygen Demand (COD) was 0.26 Kg-COD m-3 d-1, compared to only 0.04 Kg-COD m-3 d-1 in the open circuit control which did not produce considerable biogas amounts. In a similar reactor separated with a cation exchange membrane, acetate could be retrieved from the cathode with an efficiency of up to 85% and rates of 2.5 mM d-1. Phylogenetic analysis revealed that the initial microbial population was enriched with substantially different bacterial species on the two electrodes of each MEC, despite the fact that the electrodes were hydraulically connected. Distinct tasks were carried out by these different microbes, as also supported by the cyclic voltammograms.

microbial electrolysis cells

microbial diversity

biocathodes

carbon dioxide reduction

Author

Nikolaos Xafenias

Chalmers, Chemical and Biological Engineering, Industrial biotechnology

Lisbeth Olsson

Chalmers, Chemical and Biological Engineering, Industrial biotechnology

Valeria Mapelli

Chalmers, Chemical and Biological Engineering, Industrial biotechnology

Proceedings of the Fifth European Fuel Cell Technology & Applications Conference- Piero Lunghi Conference, 11-13 December 2013, Rome, Italy

Subject Categories

Industrial Biotechnology

Environmental Engineering

Chemical Engineering

Environmental Biotechnology

Areas of Advance

Energy

More information

Created

10/7/2017