NOVELTY - A gas purification apparatus (10) has a mixing unit (13) to mix carbon dioxide-containing gas comprising a gas component and carbon dioxide with absorption water (12), and an absorption tower (14) to separate carbon dioxide from the carbon dioxide-containing gas, and comprising a stripper (15) and an aerator. The carbon dioxide is dissolved in the absorption water. The carbon dioxide-containing gas after mixing with absorption water using the mixing unit is further contacted with absorption water, and the carbon dioxide in carbon dioxide-containing gas is dissolved in the absorption water.    USE - Apparatus is used for purifying carbon dioxide-containing gas e.g. sewage gas discharged by bio-fermentation (both claimed) of organic waste discharged from sewage processing industry, foodstuffs industry, beer manufacturing factory, and livestock breeding farm.    ADVANTAGE - The compact apparatus efficiently purifies the carbon dioxide-containing gas.    DETAILED DESCRIPTION - A gas purification apparatus has a mixing unit to mix carbon dioxide-containing gas comprising a gas component having water-solubility less than the water-solubility of carbon dioxide, and carbon dioxide with absorption water, and an absorption tower to separate carbon dioxide from the carbon dioxide-containing gas, and comprising a stripper which separates gas component and carbon dioxide, and an aerator which diffuses carbon dioxide in the absorption water. The carbon dioxide is dissolved in the absorption water. The carbon dioxide-containing gas after mixing with absorption water using the mixing unit is further contacted with absorption water, and the carbon dioxide in carbon dioxide-containing gas is dissolved in the absorption water. The apparatus provides purified gas as non-absorbed gas. An INDEPENDENT CLAIM is included for purification of carbon dioxide-containing gas.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic view of the gas purification apparatus. (Drawing includes non-English language text)    Gas purification apparatus (10)    Absorption water (12)    Mixing unit (13)    Absorption tower (14)    Stripper (15)