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Large Scale Fixed Bed Ion-Exchange System for Removing Strontium-90 from Fluid Milk. I. Processing Results¹

Producers Creamery Company, Springfield, Missouri

H. E. Walter

Dairy Products Laboratory, Eastern Utilization Research and Development Division, USDA Washington, D. C.

Jack H. Fooks

Research Branch, Division of Radiological Health, Public Health Service, U. S. Department of Health, Education, and Welfare Washington, D. C.

ABSTRACT

A large scale fixed bed ion-exchange system for removing Sr⁹⁰ from fluid milk is described. The plant was operated over a period of ten months, processing a total of 413,000 liters of milk at flow rates of 5,700 liters/hour during an 8-hr run. No unusual processing problems were encountered.

The plant was fully automated (except for re-use of regenerant), constructed of stainless steel and other approved materials, and in compliance with 3-A Standards where applicable. Processing conditions were based on data obtained at Beltsville for flow rates, pH adjustment, regenerant composition, and sanitation control. The processed milk, although organoleptically acceptable, was spraydried and utilized for animal feed. In the event that environmental contamination should exceed safe tolerances, this process is a feasible and practical means for substantially reducing the levels of Sr⁹⁰ in milk.

¹ A report of work done under contract with the U. S. Department of Agriculture and authorized by the Research and Marketing Act of 1946. The contract was supervised by the Eastern Utilization Research and Development Division of the Agricultural Research Service. Funds were jointly provided by Agricultural Research Service and the Division of Radiological Health of the Public Health Service, USDHEW.