Susana Almeida and Arne Gladis. Photo: Christian Ove Carlsson

Biogas upgrading for high-purity CO2 and natural gas distribution

State-of-the-art within biogas cleaning and upgrading is to remove CO2 and impurities from the biogas to make the gas suitable for distribution and sale into the existing natural gas grid as biomethane. 

Today the relatively high-purity CO2 from the upgrading is emitted as a wasteproduct into the atmosphere. Instead of emitting the CO2, our aim is to turn it into a valuable green product, BioCO2, which can be sold as an additional commercial product by the biogas producer.

The quality of the bioCO2 should be suitable for food, biofuel, and medicine production, and welding purposes.

The second aim in this project is to reduce the energy consumption of the amine adsorption-based biogas upgrading technique by up to 45% by introducing new additives to the process. This will also contribute towards improving the financial viability of biogas production.

During the project, we will use data from exiting biogas upgrading plants to benchmark our envisaged technology from an energy and cost point of view to create a viable business case for biogas producers.

We will also test the capability of the additive-improved amine upgrading technology to produce both  biomethane and high-purity BioCO2 at three industrial biogas production sites using a mobile demonstration test unit (MTU), which will be constructed during the project.

The project is a collaborative effort between CERE, DTU, Union Engineering A/S, and Dansk Gasteknisk Center and has a total budget of 14 million DKK. It is funded by the Danish Energy Agency’s Energy Technology Development and Demonstration Program (EUDP) and is scheduled to run from 2016-2020



Philip Loldrup Fosbøl
Associate Professor
DTU Chemical Engineering
+45 45 25 28 68


Susana Raquel Melo de Almeida
DTU Chemical Engineering
+45 45 25 28 63