METHOD FOR PURIFYING CONTAMINATED WATER CONTAINING RADIOACTIVE CESIUM

摘要

PROBLEM TO BE SOLVED: To provide a method for purifying contaminated water containing radioactive cesium that generates radioactive waste whose quantity is small after its treatment and that requires no time-consuming work during the treatment.SOLUTION: A method for purifying contaminated water containing radioactive cesium comprises: an adsorption step of mixing ferrocyanide with contaminated water to adsorb radioactive cesium on the ferrocyanide; a precipitation step of precipitating the ferrocyanide having adsorbed radioactive cesium by the use of a flocculation precipitant in the contaminated water; and a separation step of separating flocculated precipitate containing radioactive cesium from a supernatant solution in the contaminated water after the precipitation step. The flocculation precipitant contains silicon dioxide and alumina. Further, the flocculation precipitant preferably has an absolute value of zeta potential of 15 mV or more.