付着細菌数の除去に影響する水洗要因の検討

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  • Factors Affecting on Reduction of Bacteria Contaminated by Washing with Jet Stream.
  • フチャク サイキンスウ ノ ジョキョ ニ エイキョウスル スイセン ヨウイン

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Experiments were conducted to evaluate several factors affecting on reduction of bacteria contaminating chicken house floor by washing with jet stream. Reduction of bacteria contaminating materials for the house built by washing also examined. It was considered that main factors affecting on reduction of bacteria by washing with jet stream would be amount of water jetted out, pressure of jet stream, temperature of the stream and brushing the house floor where the stream lashed down.<br>Amount of water used washing was 4, 6 and 8l per m2. No significant difference was observed reduction of bacteria among amounts of water jetted. High pressure of jet stream 80 and 150 kg/cm2 reduced bacteria as same as stream with normal pressure 25kg/cm2. High temperature jet stream at 100°C reduced bacteria as same as normal temperature stream at 24°C. Reduction of bacteria was approximately 10-1 or less than that of bacteria before washing.<br>Washing on the floor by the stream with brushing was effective to reduce bacteria contaminated. Reductions of bacteria by washing with brushing were 10-1.4 to 10-2.4 of bacteria before washing. Washing was conducted to combine the terms which would be effective to reduce bacteria. The terms combined were 8l per m2 of water, 80kg/cm2 of stream pressure, temperature of the stream at 100°C and detergent was sprayed before washing to increase the reduction of bacteria. Brushing on the floor was carried out 9 times when the stream lashed down. Reduction of bacteria was 10-2.5 of bacteria contaminatd before washing. It is considered that this degree of bacterial reduction would be marginal by washing using jet stream.<br>Bacteria contaminated fancy plywood, plastic and zinc iron boards without rust were removed easily by jet stream. Reductions were 10-3.2 to 10-4.1 of bacteria contaminated before washing. On the contrary, bacteria contaminating concrete, wooden, plywood, rusty zinc iron and slate boards were not removed easily. Reductions were 10-0.9 to 10-1.3 of bacteria contaminated before washjng.

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