To quickly separate alcohol and water by vaporization and effectively separate sodium in a short period of time even in case of high water content in alcoholic waste liquid.

In a carbonate producing tank 2, carbon dioxide gas or dry ice are added to radioactive alcohol waste liquid with main component of sodium including radioactive materials for depositing sodium as carbonate. Then the deposit is removed by reduced pressure drying treatment in a reduced pressure drying device 4. The radioactive solid in the deposit is desired to be separated by solving in water to be water solution and then filtering.