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KMID : 1156220120380020159
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Journal of Environmental Health Sciences
2012 Volume.38 No. 2 p.159 ~ p.165
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A Study on the Microorganism Disinfection and Characteristics of Discharged Water of Dielectric Barrier Discharge Plasma Systems
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Kim Dong-Seog
Park Young-Seek
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Abstract
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Objectives: This experiment was carried out to elucidate the effect of discharged water on the disinfection of Phytophthora capsici and evaluate the water characteristics.
Methods: The dielectric barrier discharges (DBD) plasma reactor system used in this study consisted of a plasma component [discharge, ground electrode and quartz dielectric tube], high voltage source, and air supply. The effects of water characteristics such as pH, ORP and conductivity and the disinfection effect of discharged water were investigated.
Results: Experimental results showed that in the process of discharge, the pH decreased, whereas ORP and electric conductivity increased. When the discharge time was 30 min, Phytophthora capsici of 2.94 log was disinfected within 300 seconds. Disinfection performance of stored discharged water was maintained for three days; however the disinfection effect vanished after five days. When Phytophthora capsici was injected into the discharged water, the disinfection effect decreased after two days.
Conclusions: It is considered that the main disinfection parameters of the discharged water were chemically active species such as H2O2 and O3 and high ORP.
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KEYWORD
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plasma, disinfection, Phytophthora capsici, discharged water
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