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Development of a Pulsed-Bed Ion Exchange Contactor for Removing Cationic Radionuclides from Milk

Food Protection Research, Environmental Sanitation Program, National Center for Urban and Industrial Health, Cincinnati, Ohio

ABSTRACT

A pulsed-bed ion exchange contactor, designed by Chemical Separations Corp. for continuous operation, was constructed for these studies. Its performance was investigated and procedures for sanitary operation were developed. Several modifications of the original design were required for satisfactory sanitary operation. The most significant change was the use of hot (85 C) regenerating solution for simultaneous regeneration and sanitization of the continuously moving resin. Raw milk labeled with ⁸⁵Sr was processed with the contactor, and 97% of the ⁸⁵Sr was removed without appreciably altering the cationic composition of the milk. The contactor was operated tor 20 hours without degradation of performance or of microbiological quality of milk and resin.