Each biogas-to-biomethane process has its own advantages and disadvantages, depending on the biogas origin, composition and geographical orientation of the plant. Amine scrubbers are a good choice when surplus heat is available for the regeneration of the washing liquid. With respect to cryogenic Liquefaction (CL) one may conclude that, this technology has a questionable track-record, is highly complex, hard to operate, and should therefore not be selected for small-medium scale applications.
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Upgrading of raw biogas-to-biomethane (grid, CNG or LNG quality) provides additional utilization routes that have the extra advantage to be independent of existing infrastructure. Membrane based technology is the best way forward due to its ease of operation, robustness and the high quality of the end-products.