An atomic absorption spectrophotometer was installed in an automated CIP dairy plant cleaning system to detect the amount of calcium in the cleaning solution as it flowed from milk-processing equipment and storage tanks during each phase of the cleaning cycle. A major portion of the milk residue was removed from the equipment during the first half of the rinse phase. Most of the residue remaining after rinsing was removed during the first 2 min of the alkaline cleaning phase.

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Author notes

1Agricultural Engineer, U. S. Department of Agriculture, Agricultural Research Service, North Central Region, Columbia, Missouri 65201. Research done in cooperation with University of Missouri, Columbia, Missouri.

2Professor, Department of Agricultural Engineering, University of Missouri, Columbia, Missouri 65201.

3Assistant Professor, PINFST Philippine Women's University, Manila.

4Professor, Department of Food Science and Nutrition, University of Missouri, Columbia, Missouri 65201.

Contribution from the University of Missouri Experiment Station. Journal Series No. 6811. As approved by the Director.

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