Nanofiltration fractionation of components of radioactive solutions – method of reducing the volume of waste
Baromembrane purification methods in the composition of liquid radioactive medium processing complexes are increasingly included in the practice of radioactive wastemanagement. The results of a comparative study of the efficiency of the operation of nanofiltration and reverse osmosis (RO) elements under conditions of continuous phosphatization of a model solution are presented. Dependences on the change in permeability, working pressure in the brine chamber of the RO and nanofiltration apparatus and the salt content of the permeate are shown when the salt content in the nutrient solution varies. It is shown that under the conditions of a closed loop in liquid radioactive medium, the introduction of polyphosphates to stabilize the truly dissolvedforms of the existence of multiply-charged metals on the reverse osmotic membrane ofULP leads to a systematic deterioration of the permeability of the membrane at a fixed pressure in the apparatus. In the permeate of the system with a nanofiltration membrane VNF (Vontron NanoFiltration) contains a sufficiently high concentration of salts, which indicates the removal of sodium salts from the circuit, thereby reducing the osmotic pressure of the solution, which critically affects the yield of the purified solution. Thus nanofiltration in combination with chelating agents can be an effective tool for fractionation of components of radioactive solutions, ensuring the achievement of regulatory indicators for wastewater and biologically hazardous substances that are «eternal» insulated.
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