The use of waste incineration residues for the upgrading of biogas

This paper reports the results of the tests carried out on a pilot plant built around the concept of an innovative biogas upgrading method, to produce biomethane, based on the use of solid residues from waste incineration for CO2 capture. The proposed upgrading method is based on the idea of putting in series two processes, studied in a previous project. In particular the two steps in series process is based first on the direct carbon dioxide adsorption from biogas using bottom ash, followed by absorption with regenerated alkali solutions process, where air pollution control residues are used for regeneration. Results showed that the process is able to effectively produce biomethane. The residues requirement for industrial operation was estimated for different biogas upgrading plant sizes, highlighting a quite high request of bottom ash and low request for air pollution control residues.