Journal
JOURNAL OF DAIRY SCIENCE
Volume 83, Issue 8, Pages 1887-1891Publisher
AMER DAIRY SCIENCE ASSOC
DOI: 10.3168/jds.S0022-0302(00)75061-2
Keywords
ozone; sanitation; dairy; chemical oxygen demand
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Square (2.54 x 2.54 cm(2)) 304 stainless steel metal plates were cleaned, passivated, and soiled by autoclaving (121 degrees C at 15 psi for 15 min) with reconstituted nonfat dry milk (20% solids). Fifteen-minute treatments using either warm water (40 degrees C) or ozonated cold water (10 degrees C) were conducted to compare prerinse cleaning potential of soiled metal plates. The chemical oxy gen demand determination was performed on extracted organic material from treated metal plates. Results indicated that the ozone treatment removed 84% of soil from metal plates versus 51% soil removal by the warm water treatment, but the effectiveness of the two treatments did not differ (P > 0.05). Cleaning effects were visualized using scanning electron microscopy at 200x and 2000x magnification. The amount of soil film present on stainless steel metal surfaces was visibly lower on ozonated treatments versus on warm water treatments.
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