Oxygen PSA process utilized by Medigreen Energy plants is a method of separating air into its two principal components—Nitrogen and oxygen— using adsorption technology at high pressure. Ambient air from the atmosphere is compressed in an Air Compressor up to 116 PSIG and is routed through pre filter to remove particulate material and then sent to Refrigeration dryer system which maintains the refrigeration process at temperature less than dew point (< 3 deg C) to remove moisture present in ambient air. Dry air from refrigeration dryer system is sent to an Air Receiver. Dry air from air receiver is routed through series of filters viz. fine filter and activated carbon filter to safeguard the PSA system from any fine particles and hydrocarbon/oil traces. Clean dry air from activated carbon filter is routed to PSA system for adsorption.