Separation method for plutonium in radioactive liquid waste

A predetermined amount of a plutonium-containing radioactive solution is circulated to an adsorption tower in which titanium dioxide is filled as an absorbent, and the direction of the circulation is reversed on every predetermined period of time. With such procedures, since the radioactive solution containing plutonium is brought into contact with the adsorbent on the side where adsorption is not taken place so much, that is, on the side where the concentration of plutonium in the adsorbent is lower, the adsorption rate is improved. Further, since a back wash effect is provided by the reversion of the circulating direction, the filled state of the absorbent is made uniform and a once caused drift is eliminated. As a result, an adsorption performance which is the same as the adsorption performance forecast in a batch adsorption test can be attained. (T.M.)