NOVELTY - Recovery of carbon dioxide from biogas comprises compressing biogas to produce a first process stream; feeding this to an absorption column and passing it through in counter-current to a regenerated absorption stream such that carbon dioxide is removed and the absorption stream is enriched with it, and passing enriched absorption stream to stripping stage to recover carbon dioxide stream and a carbon dioxide-depleted stream.    USE - Recovery of carbon dioxide from biogas containing methane, carbon dioxide and trace materials, especially hydrogen sulfide.    DETAILED DESCRIPTION - Method for recovery of carbon dioxide from biogas containing methane, carbon dioxide and trace materials, especially hydrogen sulfide, comprises: compressing the biogas to produce a first process stream (3); feeding this to an absorption column (5) and passing it through in counter-current to a regenerated absorption stream (12) so that carbon dioxide and trace materials are removed and the absorption stream is enriched with them; and passing the enriched absorption stream (5b) to a stripping stage (8) to recover a carbon dioxide stream (11) and a carbon dioxide-depleted stream which is used as regenerated absorption stream (12). At least one of the process streams (3, 5b) or components (6a, 6b) of these obtained by enrichment with carbon dioxide is chemically or physically treated to remove hydrogen sulfide; or a third product stream is removed from the absorption column at a position between the inlet for the regenerated absorption stream and ! the inlet for the first process stream.    INDEPENDENT CLAIMS are included for:    (1) apparatus for carrying out the method; and    (2) apparatus for recovery of carbon dioxide from biogas containing methane, carbon dioxide and trace materials, especially hydrogen sulfide, comprising a compressor (2, 4), an absorption column, a stripping unit and a purification unit (7).    DESCRIPTION OF DRAWING(S) - The drawing shows a flow diagram of the apparatus.    Compressor (2, 4)    First process stream (3)    Absorption column (5)    Enriched absorption stream (5b)    Decompression column (6)    Components of process streams obtained by enrichment with carbon dioxide (6a, 6b)    Purification unit (7)    Stripping stage (8)    Carbon dioxide stream (11)    Regenerated absorption stream (12)