The Carbon Dioxide Pressure Swing Adsorption (PSA) separation and recovery technology as well as Vacuum Pressure Swing Adsorption (VPSA) separation and recovery technology are designed to handle gas sources such as lime kiln gas, flue gas, and fermentation gas, which typically have low pressure and contain high levels of carbon dioxide. They can purify carbon dioxide from these sources, which typically contain 8-13% carbon dioxide, to levels above 95%. The carbon dioxide recovery rate can reach 70-90%.