What is the SYMBIO project?

This application is proposing an innovative process in which hydrogen produced by water electrolysis using peak load/excess electricity from wind mills, will be biologically converted by binding CO2 to CH4. This biologically catalyzed reaction can be utilized withintwo main objectives, namely

  1. Biogas upgrading and enhancement
  2. Decoupling biogas production from biomass availability

Within the first objective, H2 will be combined with the CO2 in the biogas for biogas production and upgrading. Within the second objective, H2 and waste-CO2 from sources such as exhaust gas from combustion gas motors, or from ethanol production can be injected into anaerobic reactors to increase the biogas production and decouple biogas from biomass availability.

In such a process, biogas enhancement and upgrading will be achieved, giving synergistic advantages for both the overall renewable energy system with high share of wind power and for the biogas plants themselves.

The effects of hydrogen on the biochemistry and microbiology of the process, and the technical solutions for improving hydrogen utilization in the biogas reactors will be studied in order to optimize the conversion of hydrogen to methane.

System analyses and integrated system designs will be conducted to evaluate the environmental and economic impacts and design an optimized renewable energy system decoupled from excess biomass demands.

This idea of the current project has never been applied and it offers several advantages:

  1. Contributes to lower upgrading cost of biogas
  2. Storage of wind power as methane using the existing natural gas grid/storage
  3. Decoupling biogas production from biomass availability
  4. Possibility for flexible electricity production according to the energy demand variations