The Bio-PLs project explored a new way to clean biogas—an energy-rich gas made from organic waste—using a special liquid developed at Queen’s University Belfast. This “porous liquid” contains tiny solid particles that trap carbon dioxide (CO₂), making the remaining gas cleaner and more useful as fuel.
Compared to the industry standard solvent Genosorb®, the Bio-PL captured more CO₂ (98% vs. 80%) and worked just as well with real biogas. It also showed potential to reduce operating costs by up to 30%. The team tested the technology on-site at a biogas facility in Banbridge and found it could be regenerated easily using heat or vacuum, making it more energy-efficient.
The project also developed a small-scale gas separation rig and ran detailed economic analyses. While methane loss was slightly higher than Genosorb®, future upgrades are expected to fix this. The team is now working on a larger pilot system and engaging with industry partners to move the technology closer to commercial use.
Bio-PLs offer a promising solution for small-scale biogas plants, helping farmers and communities turn waste into clean energy more affordably. It also supports Northern Ireland’s goals for renewable energy and circular economy development.