Abstract
SummaryThe extent to which food plant air may be contaminated with microorganisms from flooding floor drains has been investigated. Results indicate that bacteria counts obtained during flooding may be as high as 140 per ft3 in areas where normal counts are usually less than 10 per ft3. The air-borne yeast and mold contributions due to flooding were about 6 per ft3 compared to a background of 1 per ft3, and about 12 per ft3 compared to background counts of 4 per ft3, respectively. By continuous intermittent flooding, the amount of contamination due to flooding decreases. However, if the drain sets without flooding for a period of one hour, the contribution may be as great as during the first flooding of the day. Results indicated that application of about 5 gallons of a 800 ppm chlorine sanitizer would provide a significant reduction in contribution. A maximum reduction of 87 percent was obtained using a sanitizer concentration of 5000 ppm.
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