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Áirítear sa chatagóir seo na catagóirí teicneolaíochta seo a leanas chun bithghás a uasghrádú ina bhithmheatán: Asúchán trí aistriú brú (Pressure Swing Adsorption PSA), Íonú le huisce faoi bhrú (Pressure Water Scrubbing PWS), Deighilt scannán (Membranes), Deighilt crióigineach, Íonú fisiceach orgánach (Organic Physical Scrubbing OPS).
This category includes the following categories of technologies for biogas upgrade to biomethane: Pressure Swing Adsorption (PSA), Pressure Water Scrubbing (PWS), Membranes, Cryogenic, and Organic Physical Scrubbing (OPS).