METHOD FOR TREATING RADIOACTIVE EFFLUENT SOLIDIFICATION

PROBLEM TO BE SOLVED: To provide a method for treating radioactive effluent solidification for making a solidified body employing an in-drum method and by solidifying a radioactive effluent containing sodium sulfate and having high radioactive concentration, wherein a solution resulting after the solid body is immersed in water that has a pH of 12 and a sulfate ion concentration that is not higher than a mortar equilibrium concentration. SOLUTION: Barium hydroxide 5 is added to a radioactive effluent 1 containing sodium sulfate so that the content of barium hydroxide becomes equivalent to or higher than the content of sodium sulfate in terms of mol, and a silicon oxide compound 6 and a water reducing agent 7 are added to a mixture of barium sulfate and an aqueous alkali solution, thus obtained, and are kneaded to produce water glass. A hardener 8 is added to a mixture of the water glass produced and barium sulfate prior to being subjected to the kneading and solidification treatment. A viscosity enabling solidification treatment by in-drum method can be obtained, by controlling a water/powder ratio and the quantity of the water reducing agent 7, wherein the ratio of total water/(total of silicon oxide compound 6 and hardener 8) is defined as the water/power ratio. COPYRIGHT: (C)2008,JPO&INPIT