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Effect of Sanitizing Procedure on Chemical Aspects of Process for Removal of Radionuclides From Milk

Milk and Food Research, Robert A. Taft Sanitary Engineering Center, Cincinnati, Ohio

ABSTRACT

In the process for removal of radionuclides from milk, the treatment of milk, preparation of regenerant solution, and sanitizing procedures for the resin and regenerant solution have been described previously (1, 6). Milk was labeled with strontium⁸⁵ (Sr⁸⁵) in vitro, whereas the cesium¹³⁷ (Cs¹³⁷) present in milk was that from natural contamination from fallout. Analysis of treated milk showed Sr⁸⁵ removal of 95.1 ± 1.3%, 92.1 ± 1.6%, and 89.8 ± 1.4% at milk flow rates of 0.0625, 0.125, and 0.25 resin bed volume per minute, respectively. These values are in conformity with those obtained under laboratory conditions by using milk labeled with Sr⁸⁵ in vivo (3), indicating that the sanitizing treatments had no effect on Sr⁸⁵ removal. The removal of Cs¹³⁷ was approximately 65% at all the milk flow rates studied. The nitrogen distribution and the cationic composition of milk before and after resin treatment were not significantly different and show that the presence of NH₄⁺ and Na₂SO₃ in the regenerant solution had no effect on resin regeneration characteristics. The resin regeneration procedure described previously (4) was modified to improve efficiency of stripping radioactivity adsorbed on the resin and to reduce amount of radioactivity conserved in the regenerant solution used for recycling purposes.