Ozone is a technology that has been widely developed because it has many benefits in various fields. Therefore, the development of ozone generators continues to be carried out to find the most optimum setup. This paper will compare the effectiveness of ozone production from two reactors that have different geometries, namely a long reactor and a large diameter reactor with variations in flowrate and frequency. The ozone generator used is a dielectric barrier discharge (DBD). The increase in voltage applied to the reactor makes the current also greater. Apparently, the use of a small flowrate increases the concentration of ozone produced at each voltage variation. It was found that the large reactor had a better concentration than the long reactor at each variation of flowrate and frequency. Dissolved ozone was also observed, it was found that oxygen gas sources can dissolve ozone better than free gas sources in water

Keywords : Dielectric Barrier Discharge, ozone concentration nano-micro bubble, gas flowrate, dissolved ozone