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Mud Hills clinoptilolite has been used in an effluent treatment plant (SIXEP) at the Sellafield nuclear reprocessing site. This material has been used to remove 134/137 Cs and 90 Sr successfully from effluents for 3 decades. Samples of the zeolite have been tested in column experiments to determine their ability to remove radioactive Cs + and Sr 2+ ions under increasing concentrations of competing ions, Ca 2+ , Mg 2+ , Na + and K + . These ions caused increased elution of Cs + and Sr 2+ . Ca 2+ , Mg 2+ and K + were more effective competitors than Na + . For Na + , it was found that if concentration was reduced, then column performance recovered rapidly.

The use of columns of the zeolite clinoptilolite in the remediation of aqueous nuclear waste streams