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Evaluating methane and acetate production in microbial electrolysis cells: reactor performance and microbial diversity

Nikolaos Xafenias (Institutionen för kemi- och bioteknik, Industriell Bioteknik ) ; Lisbeth Olsson (Institutionen för kemi- och bioteknik, Industriell Bioteknik ) ; Valeria Mapelli (Institutionen för kemi- och bioteknik, Industriell Bioteknik )
Proceedings of the Fifth European Fuel Cell Technology & Applications Conference- Piero Lunghi Conference, 11-13 December 2013, Rome, Italy (2013)
[Konferensbidrag, refereegranskat]

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.

Nyckelord: biocathodes, carbon dioxide reduction, microbial diversity, microbial electrolysis cells



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Denna post skapades 2014-01-07. Senast ändrad 2016-05-24.
CPL Pubid: 191440

 

Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Industriell Bioteknik (2008-2014)

Ämnesområden

Energi
Kemiteknik
Naturresursteknik
Miljöbioteknik
Industriell bioteknik

Chalmers infrastruktur