Plasma for Air and Water Sterilization
This chapter describes the research efforts of Drexel Plasma Institute (DPI) in the area of plasma-based air and water sterilization. Motivation of this research is presented as well as the methods for selection of parameters for the experimental systems. Experimentally obtained results for air sterilization demonstrate that the direct influence of plasma charged particles on airborne bacteria in combination with active chemical substances generated by plasma is the probable reason for high sterilization efficiency of the Dielectric Barrier Grating Discharge (DBGD). Energy input on the level of 13 kJ/m3 is enough to reach a 5-log reduction of viable E. coli bacteria. Experimentally reached D-value (the dosage required for a 90% reduction of the number of viable microorganisms) for E. coli bacteria deactivation in water using spark discharge is very low, about 125 kJ/m3, and UV-radiation is the most plausible sterilization factor in this case. A new semi-numerical model is proposed for initial phase of electrical breakdown in water.
KeywordsDielectric barrier discharges spark discharge air sterilization water sterilization breakdown in liquid
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