A high-voltage high-frequency power supply for ozone generation is presented in this paper. Ozone generation is intended to be used in air and in water disinfection. A power stage consisting of a single-phase full bridge inverter for regulating the output power, a current push-pull inverter (driver) and a control circuit are described and analyzed. This laboratory build power supply using a high voltage ferrite transformer and a PIC microcontroller was employed to energize a dielectric barrier discharge (DBD) ozone generator. The inverter working on the basis of control strategy is of simple structure and has a variation range of the working frequency in order to obtain the optimal frequency value. The experimental results concerning electrical characterization and water treatment using a cylindrical DBD ozone generator supplied by this power supply are given in the end.

The oxidation by ozone is considered as being an effective solution and offers irrefutable advantages in wastewater treatment. Ozone is used to treat different types of water due to its effectiveness in water purification and for its oxidation potential. This process of ozonation becomes progressively as an alternative technology and is inscribed in a sustainable development perspective, in particular in Algeria, where other conventional techniques of treatment are used in comparison to the latter, which is often used in Europe. Our work describes this process of treatment using the ozone produced by dielectric barrier discharges (DBD), which are fed by a high voltage of several thousands of volts. So, we conceived and accomplished a new generator of ozone DBD of cylindrical form, which will be used for wastewater treatment (WWTP) of Mascara, west of Algeria. Our experimental results have revealed the effectiveness of this type of treatment on the basis of physicochemical analysis (pH, turbidity, chemical oxygen demand, biological oxygen demand and oxidable matter) and bacteriological (total coliforms, fecal coliforms, Escherichia coli and Salmonella) upstream and downstream of the WWTP which presents a very high rate of elimination of all the parameters, particularly for the turbidity and bacteria in a very effective manner.

A dielectric barrier discharge (DBD) is a non-equilibrium cold plasma generated at atmospheric pressure between two electrodes covered with dielectric. The ionized plasma resulting from DBD is characterized by an electron temperature of a few electron volts (eV) much higher than that of neutral species (≈ 300 K) which are the majority. Following the achievement of a DBD reactor of cylindrical shape, we carried out its electric characterization then we used it as an ozone generator in a laboratory setup for treatment of wastewater. We could verify that DBD reactor used as generator of ozone in the treatment of urban and industrial wastewater, is very efficient in removing suspended matter and heavy metals. In Algeria, as this technique is not used both in domestic and industrial scale, the objective of the paper is to demonstrate experimentally that a system of water treatment using ozone generated by DBD is highly efficient