Effect of divided electrode of screw-type ozonizer for ozone generation and basic study of ozone sterilization effect against bacteria in soil

Abstract

We have been developing an ozone generation system which is suitable to the soil sterilization and studying ozone generation characteristics. The ozone was generated by using the dielectric barrier discharge with a screw type electrode. From our previous research, we have found that ozone concentration depends on the width of the outer electrode, the flow rate of the source gas and the applied voltage. In this research, we investigated ozone generation characteristics by changing the width of the outer electrode (1cm×1 or 3cm×1) or using divided outer electrodes (1cm×3), under the applied voltage of 0–15.0kV, the source gas of pure oxygen and the flow rate of O 2 of 0.5L/min. And we also investigated sterilization ability of the generated ozone by using outer electrode of width of 3cm×1 under the applied voltage of 15.0kV, the source gas of pure oxygen and the flow rate of O 2 of 0.5L/min. As a result, we found that supplied electric power is increased with expansion of actual discharge space by using divided outer electrodes. Then high concentration of ozone could be generated in our ozone generation system. Maximum ozone generation efficiency was 228g/kW at ozone concentration of 3.66g/m3 when we used divided outer electrodes of 1cm×3. And, we could verify sterilization effect of ozone.