ADVANCED STUDY OF MILK DECONTAMINATION BY ELECTRODIALYSIS
Final rept. Jul 1964-May 1965
IONICS INC WATERTOWN MA RESEARCH DIV
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A five gph electrodialytic milk decontamination test plant decontamination test plant was built and operated. Parameters studies were membrane life, effect of time on current efficiency and cleaning technique. After the initial debugging expected with any test plant, operability was excellent. Approximately 8,000 lbs of milk were treated. Removal of radioactive Sr-90 and Cs-137 averaged 90. The ion-selective membranes showed no decrement in performance following an initial drop from 90 current efficiency to 82 during the first 60 hours of operation. A suitable in situ method of cleaning the membrane stack was developed consecutive rinses of water, 5 NaOH, warm 150F water, 5 HCI and water. The chemical costs of this cleaning method come to about 0.03 centgallon milk. Bacteria counts always remained below the 50,000 per m1 USPHS standard.
- Food, Food Service and Nutrition