METHOD FOR DECONTAMINATING LIQUID RADIOACTIVE WASTES Russian patent published in 1999 - IPC

FIELD: ultrafiltration of contaminated liquid wastes containing surface-active and inorganic detergents in special laundries. SUBSTANCE: waste detergent and rinse water are decontaminated separately and after ultrafiltration detergent cleaned of radionuclides and suspended substances can be reused; rinse water is subjected to nanofiltration upon ultrafiltration; ultrafiltered and nanofiltered concentrates of rinse water are combined with ultrafiltration concentrate of waste detergent and their joint radiation treatment is conducted by means of gamma-radiation source followed by their evaporation to obtain still bottoms conveyed for subsequent solidification and condensate which is combined with clean water obtained after nanofiltration for its reuse or drain. If waste detergent and rinse water contain cesium radionuclides, solutions to be treated should be doped with nickel or copper ferrocyanide before ultrafiltration. EFFECT: reduced amount of liquid radioactive wastes subject to solidification and provision for reuse of rinse water or its discharge to open water main. 1 dwg