Wärtsilä Gas Solutions, a business unit of the global technology group Wärtsilä, has unveiled the Puregas BC, a cutting-edge solution for purifying and liquefying carbon dioxide captured from biogas upgrading plants. This innovation marks a major step forward in enabling carbon-negative, energy-efficient, and economically viable operations for biogas plant owners.
Traditionally, biogas upgrading plants operate on a “catch and release” model, where carbon dioxide is removed from the biogas but subsequently released into the atmosphere. The Puregas BC changes this paradigm by applying advanced purification and liquefaction technologies to retain and repurpose the captured carbon dioxide. The result is a transformative system that not only reduces emissions but turns biogas—already considered a circular and carbon-neutral fuel—into a carbon-negative energy source.
When integrated with Wärtsilä’s Puregas CA biogas upgrading system, the solution eliminates nearly all methane slip (less than 0.1 percent), as any trace methane can be redirected back into the upgrading process. This ensures maximum environmental efficiency.
Beyond environmental advantages, Puregas BC offers a valuable new revenue stream. The purified carbon dioxide meets food and beverage quality standards, and can also be stored or used as feedstock in e-fuels production—a growing demand area due to emerging sustainability regulations.
“The world is facing a climate crisis that calls for not only neutralising but reversing the impact of carbon emissions. The Puregas BC is a product that can deliver this and move from a carbon neutral to a carbon negative impact,” said Magnus Folkelid, Sales Manager, Wärtsilä Gas Solutions, Biogas. “The solution is designed to support our customers to reach their decarbonisation commitments. On top of this, the product also offers a commercial benefit.”
Delivered as a containerised, plug-and-play system, Puregas BC requires no additional buildings and is designed for seamless integration with existing Puregas CA systems. It is also suitable for retrofit projects and can be adapted to work with other biogas upgrading technologies, making it a flexible and future-ready investment for plant operators.
For more information visit www.wartsila.com
