Gas temperaure measurements of nano-seconds pulsed discharge based ozonizer

Recently, it is demonstrated by our research group that the non-thermal plasma produced using the nano-second pulsed discharge has extremely higher energy efficiency to produce of ozone. On the other hand, the maximum ozone concentration has been saturated at approximately 40 to 50 g/m³. Therefore, for waste water treatments, the ns pulsed discharge based ozonizer still needs to have the higher ozone concentration around 120 g/m³. In this work, since many researchers reported that gas temperature in ozonizers strongly affects the characterization of the ozone generation, the gas temperature inside of the ozone generation reactor was experimentally measured to investigate the relationship between saturation of ozone concentration and gas heating. Additionally, the percentage of input energy lost as heating was investigated. As a result, the gas temperature inside the reactor was increased up to 313 to 323 K from room temperature. However, rise in gas temperature seemed to have little effect on the saturation of the ozone concentration at that temperature level. Also, in actually, 80 to 90% of input energy into the discharge reactor was used to heat the gas in and the metal electrode of reactor during the ns pulsed discharge.