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Effects of Air Pressure, Orifice Size and Electrostatic Charge of Spray on Chemical Properties and Bactericidal Efficacy of Electrolyzed Oxidizing Water

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  036180,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.14152) @2003
Authors:   SHUN-YAO HSU, CHYER KIM, YEN-CON HUNG, STANLEY PRUSSIN
Keywords:   Spray gun, electrolyzed oxidizing water, Listeria monocytogenes

Three-factor three-by-three-by-two-level factorial designs were adopted for studying the effects of air pressure, sprayer orifice size and electrostatic charge of a spray gun on pH, oxidation-reduction potential (ORP), electric conductivity and residual chlorine of electrolyzed oxidizing (EO) waters with either low (< 10 ppm) or high concentration (>72 ppm) of chlorine. Results indicated that small orifice reduced more ORP and chlorine than large orifices. Electrostatic charge, in general, did not have significant effect. High air pressure spray retained more chlorine and yielded higher OPR than at low air pressure. High-chlorine EO water achieved at least 3 to 4 log10 CFU/mL reduction on Listeria monocytogenes populations when sprayed with the spray gun while sprayed with a commercial backpack sprayer or a poly-tank sprayer eliminated Listeria completely. These results demonstrated that although spraying reduced 20 to 97% of the chlorine in EO water, application of EO water through spraying still has good potential for reducing bacteria in food-processing operations.

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