METHOD OF DECONTAMINATING LOW-MINERALISED LOW-ACTIVITY WASTES IN FIELD CONDITIONS Russian patent published in 2011 - IPC G21F9/04 

FIELD: chemistry.

SUBSTANCE: invention relates to the technology of decontaminating liquid radioactive wastes using a membrane-sorption method in field conditions. The method of decontaminating low-mineralised low-activity liquid radioactive wastes is realised through cleaning on mechanical and ultra-filters, desalination on reverse-osmosis filters and post-cleaning on ionite filters with post-evaporation of the formed radioactive concentrates until salt saturation at temperature lower than 100°C in a container and subsequent addition of the saturated salt concentrates to portland cement. Also, wastes are cleaned from radio nuclides on filters using selective sorbents with protection from ionising radiation. Post-evaporation of concentrates from reverse-osmosis filters is carried out at atmospheric pressure in a container. The condensate from the evaporation apparatus is returned to the ultra-filters. The concentrate from the ultra-filters is returned to the mechanical filters. Initial radioactive concentrates with beta-radiating nuclides specific activity greater than 0.1 MBq/kg and/or radioactive concentrates with specific activity greater than 0.1 MBq/kg before evaporation are directed to the selective sorbent filters.

EFFECT: more efficient removal of radionuclides even without using selective sorbent filters.

1 dwg, 4 ex