M72
ENEA Technology
BIOGAS FROM ANAEROBIC DIGESTION TREATMENT: PURIFICATION AND E UP-GRADING TO BIOMETHANE
Technology Readiness Level (TRL)
3
Innovations and Benefits
The energetic content of biogas produced by anaerobic digestion facilities lies in its methane component. The biogas treatment technologies towards biomethane utilization foresee three steps: biogas deumidification, sulphurate compounds removal, in particular hydrogen sulfide, and carbon dioxide separation, in order to get a gas, the biomethane, suitable to be injected into the natural gas network. The developed methods optimize the costs and the energetic expense of those processes.
Use
The processes of purification and upgrading of the biogas produced by anaerobic digestion can be utilized downstream the digesters utilizing as feedstock both zootechnical and agricultural residuals, and the organic part of municipal wastes. The biomethane obtained by the purification and removal of the CO2 content in biogas can be utilized for heat production by combustion (with higher efficiency with respect to direct biogas utilization) or as fuel, or can be injected into the natural gas network.
Applications and ongoing Activities
At the ENEA Lab experimental tests have been carried out in order to optimize the operating conditions of biogas purification from sulphurate compounds by activated carbons.
The biogas was cyclically up-graded by CO2 absorption in a amine solution in a mixing of ethylene glycol and n-propanol. Both synthetic and real biogas was used for the up-grading tests.
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