Upgrading of biogas using ash

Last changed: 05 November 2021

In order to be able to use biogas as a vehicle fuel it needs to be purified so that the methane share is increased whilst the carbon dioxide share is reduced. When biogas pass through a container with ash its methane share will increase whilst the carbon dioxide share will be reduced. Through a number of processes the carbon dioxide in the gas and the calcium oxide in the ash produce calcium carbonate, i.e. lime stone. A number of projects have aimed at making the process applicable for biogas upgrading: