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Biogas cleaning is carried out through physical absorption or water scrubbing: one of the most widespread technologies, it can be installed with and without recovery of the washing water and also operates with small sizes.
Absorption can take place in co-current, counter-current or crossed flow towers.
Hydrogen sulphide (H2S) must be separated before washing because it is corrosive, this will be done via an iron chloride filter.
The upgrade can be achieved via chemical adsorption, membranes or cryogenesis.
