CO₂ Recovery from biogas upgrading
1 October 2026
Recover and liquefy the CO₂-rich off-gas from biomethane upgrading into purified liquid CO₂, with methane recovery where relevant.
Solveno Technologies provides CO₂ recovery and liquefaction systems for biomethane plants. Our technology processes the CO₂-rich off-gas from biogas upgrading into purified liquid CO₂ for storage, transport and reuse. Project-specific integration can also recover residual methane and support an improved carbon intensity (CI) score, subject to the applicable methodology.
CO₂ recovery from biogas upgrading
CO₂ recovery in biomethane plants involves collecting the CO₂-rich gas separated during biogas upgrading. The gas is purified, compressed, dried and liquefied for reuse in industrial, greenhouse or dry ice applications, subject to the required product specification. Commercial viability depends on saleable CO₂ output, operating costs and a suitable outlet. Any CI improvement also depends on the destination of the CO₂, methane emissions and the additional energy required. See our FAQ on CO₂ recovery economics, energy consumption and carbon intensity.
Products
Solveno Technologies offers a full range of standardized CO₂ recovery units, with capacities from 350 to 4,500 kg of CO₂ per hour, designed to meet the specific carbon capture needs of biogas upgrading production plants. The units follow a modular design, with the configuration selected according to gas composition, required output and site conditions.
Below are two examples of our standard models; however, we offer a broad selection of additional configurations to suit different plant sizes and needs.
CB-17
A compact, modular system for recovering and liquefying CO₂ from biogas upgrading off-gas.
Capacity
Up to 850 Nm³/h
CO₂ purity
>99.9% — application-specific impurity limits also apply.
Setup
1x 30ft. container
2x 20ft. container
CB-12
A smaller-capacity configuration for purified liquid CO₂ production, designed around the required product specification.
Capacity
Up to 600 Nm³/h
CO₂ purity
>99.9% — application-specific impurity limits also apply.
Setup
1x 40ft. container
1x 20ft. container
For more detailed information and to download our product sheets for the available standard solutions:
Patented carbon capture technology
Our patented carbon capture technology is at the heart of our approach to efficient CO₂ removal and liquefaction. After the biogas is upgraded, the captured CO₂ can be condensed into liquid form, ready for reuse in various industries. This process is energy-efficient and highly customizable, allowing us to design solutions tailored to different biogas compositions and project scales.
Our technology offers several key advantages:
Residual methane recovery: Methane separated from the CO₂-rich off-gas can be returned to a suitable process point where the plant configuration allows. The recovery route and resulting methane emissions must be assessed across the complete installation, including purges, start-up and shutdown.
Food-grade CO₂: Our process is designed to produce high-purity liquid CO₂ to the agreed product specification. Food-grade supply requires source qualification, compliance with relevant impurity limits and appropriate quality procedures. An analysis unit supports verification of product quality.
Energy efficiency: We optimize the liquefaction process to reduce electricity consumption per tonne of saleable liquid CO₂. Energy consumption and recovery yield are assessed together at the agreed inlet conditions and product specification.
What does lower electricity consumption mean for your biomethane plant? Read our guide to energy-efficient CO₂ liquefaction to compare consumption figures and calculate the annual electricity savings for your production volume.
Assess the potential of your CO₂ stream
CO₂ recovery economics and carbon intensity
Carbon intensity: CO₂ recovery can improve the biomethane CI score where the applicable methodology recognises the emissions savings. The assessment includes CO₂ use or storage, methane emissions and additional energy consumption. CO₂ reuse in dry ice is not permanent carbon storage.
Project profitability: Assess CO₂ sales, additional recovered methane and any recognised commercial value of an improved CI score separately. Compare these benefits with total installed investment, electricity, maintenance, quality control, storage and transport costs.
Renewable energy source: Upgraded biogas can replace fossil fuels, providing a renewable source of energy for heating, electricity, and vehicle fuel.
Integration with biogas membrane separation
Biogas upgrading by membrane separation separates methane from CO₂ to produce biomethane. Solveno Technologies’ CO₂ recovery system treats the resulting CO₂-rich off-gas. The two process stages must be coordinated to manage gas flow, pressure and residual methane.
Key integration requirements:
- Gas composition: Assess CO₂, methane, oxygen, nitrogen, moisture and relevant trace contaminants.
- Operating conditions: Define minimum, normal and maximum flow, available pressure and allowable backpressure.
- Controls and methane handling: Agree control interfaces, the route for methane-containing streams and operation during recovery-unit shutdowns.
Integration is also possible with other upgrading technologies, subject to the actual off-gas conditions. Our CO₂ recovery solutions purify and liquefy the separated carbon dioxide for reuse. Read our FAQ on upgrading compatibility and retrofit requirements.
For sites considering on-site dry ice production, the Solveno Technologies and Cold Jet partnership combines Solveno Technologies’ CO₂ purification and liquefaction with Cold Jet’s dry ice production technology. The choice between liquid CO₂ sales and dry ice production depends on demand, distribution and the complete operating cost.
Customized engineering and comprehensive support
At the core of our offering is a tailored engineering approach. We assess the specific requirements of each project, from inlet gas variations and required product quality to utilities, storage and integration with the existing plant.
Our process includes:
- Modular system design: We assess the input composition, output requirements and local regulations to select the CO₂ recovery configuration and required project-specific adaptations.
- System integration: We define the gas connection, utilities, control interfaces and storage requirements with the plant operator and relevant equipment suppliers.
- Training and consultation: We provide training for your team to operate the system effectively, as well as ongoing consultation to maximize plant performance.
Difference between CO₂ recovery from dry ice vs biogas upgrading
CO₂ gas from dry ice production originates from liquid CO₂ and generally requires less purification than biogas upgrading off-gas. Its treatment requirements still depend on gas quality and collection conditions. Biogas off-gas can contain residual methane, oxygen, nitrogen and trace contaminants that must be managed to meet the required liquid CO₂ specification.
Solveno Technologies’ CR35 installation at IJsfabriek Strombeek is an operating reference for CO₂ recovery from dry ice production. The published project report records 1,000 tonnes recovered in its first two months. This reference demonstrates dry ice gas recovery; biogas projects require a separate assessment of purification and integration requirements.
CO₂ recovery for biogas projects across Europe
Market conditions, regulations, CO₂ offtake and project economics differ by country. Solveno Technologies supports biogas and biomethane projects across Europe with country-specific information on CO₂ recovery, liquefaction and integration.
Interested to see what the installation of our unit looks like?
Discuss your CO₂ recovery project
Share your plant location, available off-gas flow, gas analysis and annual operating hours. If available, include your electricity price, required CO₂ specification and intended outlet. These inputs allow Solveno Technologies to assess the suitable configuration and the main technical and economic conditions. Our CO₂ recovery FAQ explains the information needed for an initial feasibility assessment.
Further information
CO₂ Recovery from dry ice production
Recover CO₂ gas released during dry ice production, reliquefy it and return it for reuse. Solveno Technologies supplies modular systems designed around your production equipment and operating conditions.
Read more