Nano ltration puri cation of liquid radioactive waste

Abstract

The paper presents the results of testing the puri cation of real liquid radioactive waste from radionuclides - bottom residues of the Kola and Beloyarsk nuclear power plants (NPP), as well as low-level wastewater from the radiochemical building of the Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences (IPChE RAS) by the method of nano ltration (NF) using a polymer membrane manufactured by the Russian company «RM Nanotech». It has been shown that in the case of single-stage NF puri cation bottoms of the Kola (NPP), the coe cient of puri cation from 60Co is 2.8, while puri cation from 137Cs practically does not occur. When cleaning the bottom residues of the Beloyarsk NPP from 60Co using a ve-stage scheme, a coe cient of puri cation from 60Co equal to 388 was obtained. The combination of nano ltration puri cation and selective sorption of cesium on the ferrocyanide sorbent Temoksid-35 makes it possible to obtain a dry salt residue that is not related to radioactive waste. When using the method of nano ltration for the treatment of low-level wastewater of the Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, the degree of puri cation was, %: 137Сs ~ 75; 90Sr ~ 91; 241Am ~ 99.5; 152Eu ~ 91; 239Pu ~ 99.5.