WHAT IS THE BREAKTHROUGH
Calibration of the Potential for Green Hydrogen to Upgrade Biogas to Renewable Biomethane and Increase Biomethane Output by over 70% from a Biogas Facility: Utilising CO2 in biogas is serendipitous in that the system can use a cheap concentrated source of CO2 and function as an upgrading system converting biogas to biomethane that can use the existing gas grid. Biological methanation adds 70% to the output from a biogas facility and lends itself to existing digester systems
WHY IS IT IMPORTANT
Ireland’s plans to have 70% renewable electricity by 2030, much of which will be offshore wind, could prove problematic on an island system. Green hydrogen from offshore wind is a facilitator of renewable electricity, reducing curtailment and constraint and is a form of chemical storage. Hydrogen is a difficult fuel due to its low energy density (12 MJ/mn3), impacting distribution, and due to its flammability and the lack of an industry. Utilising CO2 in biogas is serendipitous in that the system can use a cheap source of CO2 and function as an upgrading system converting biogas to biomethane that can use the existing gas grid. Biological methanation adds 70% to the output from a biogas facility and is a technology that lends itself to AD systems
HOW HAS IT BEEN TRANSLATED
A prototype of the sequential ‘ex-situ’ reactor system is under construction in the ERI lab, due for completion in H1 2020 at a cost of €350,000. A workshop relating to this research was attended by 50 industry stakeholders, and has led to an SFI ‘Zero Emissions Challenge’ project with Gas Networks Ireland and DePuy Synthes.
- Voelklein, M.A., Rusmanis, D., Murphy, J.D. (2019) Biological methanation: Strategies for in-situ and ex-situ upgrading in AD. Applied Energy 235
- McDonagh, S., Deane, J.P., Rajendran, K., Murphy, J.D. (2019) Are electrofuels a sustainable transport fuel? Analysis of the effect of controls on carbon, curtailment, and cost of hydrogen. Applied Energy 247: 716-730
- Rusmanis, D. O’Shea, R., Wall, D, Murphy, J.D. (2019) Biological hydrogen methanation systems: overview of design & efficiency. Bioengineered, 10
WHO HAS BENEFITED FROM IT
Developers of wind farms, biogas facilities, grid manager, transport fleets, policy makers, scientists.