The detergent and biocide effect of saturated dry vapour
The objective of this study was to evaluate the efficiency of the cleaning and disinfecting operations by an industrial vapour process for different surfaces encountered in the agro-food industry.
Materials and methods
The surfaces tested (stainless steel, painted metal and tiles) are cleaned directly with the STEAMBIO 19000 (without brush, with turbo nozzle). The STEAMATIK mobile system connected to the STEAMBIO 19000 allowed to clean a belt of conveyor belts (PVC).
Efficacy detergent evaluated using Atpmetry.
The samples are made by swab of a surface area of 100 cm2. After placing the swab in the device (Luminomat, AES Chemunex), the amount of ATP is expressed as a URL (relative units of light).
Biocidal Action determined by counting the total flora.
Contact Agars (Hygicount, AES Chemunex) are applied during SEC by pressure at the crush limit (NF en 1632-3) and incubated for 48 h at 30 ° C. The results are expressed in unit forming colony by box.
Results : Detergent efficiency
Visually, the tiled floor showed traces of dirt, stainless steel and conveyor belts of the traces of fat and food residues and metal mainly from dust.
|ATP < 10: Clean|
10 < ATP < 30:
|ATP > 30: Dirty|
Amount of ATP expressed as a URL (relative units of light)
Measurements of ATP loads for testing of different zones, carried out before and after steam cleaning
Results : biocidal Efficiency
Number of colony-forming units (CFU) isolated on contact boxes for testing of different zones before and after the steam process.
Tiling is the most contaminated surface before cleaning, this higher rate can be explained by the presence of soil, a source of ground germs. The stainless steel and the carpet strip show a similar level of contamination, probably from the presence of Flores from food and manipulators. After passing the steam, all surfaces show a very sharp decrease in the number of micro-organisms (< to 4 cfu/box), Evidence of a lethal effect of the vapour on the surface germs.
The study shows that in our experimental conditions, our cleaning-dry steam disinfecting procedure has excellent detergent efficiency by eliminating the soils present on the surface of a large panel of materials and this without damaging them. In addition, the dry steam shows a very good biocidal activity with respect to the microorganisms naturally present on the surfaces.
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