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The presence of long-lived radionuclides presents a challenge to the management of radioactive wastes. Separation of the radionuclides from the waste solutions has the potential of significantly decreasing the costs associated with the immobilization and disposal of the radioactive waste by minimizing waste volumes. Typically, several separate processes are required for the separation of cesium, strontium, and actinides from 429

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Crystalline silicotitanate manufactured and marketed by UOP as IONSIV IE-911 and an ammonium molybdophosphate3polyacrylonitrile (AMP3PAN) composite sorbent have been evaluated for the removal of cesium from Idaho National Engineering and Environmental Laboratory (INEEL) concentrated acidic tank waste. Equilibrium isotherms were generated with simulated concentrated tank waste solutions and fit to the Langmuir equation. Nonequilibrium sorption was evaluated in column tests employing 1.5 cm 3 columns operating at 5, 10 and 20 bed volumes of flow per hour. Results of the equilibrium and nonequilibrium testing for both sorbents are compared.