Upgrading CO2 in biogas to methane
Solid oxide electrolysis (SOEC) technology can provide solutions to many of the challenges posed by future energy systems based on significant fraction of electrical power produced by intermittent sources like wind or solar power. Biogas from anaerobic digestion consists of methane and CO2 (from 35 to 50 %). This carbon dioxide can also be converted into additional methane by means of SOEC thus expanding this renewable resource base. The presentation will describe both the SOEC and SOFC application adapted to biogas using the vision for the Danish energy system in the future as an example. The production of SNG from surplus CO2 via a combination of wood gasification and SOEC will also be discussed.