| Abstract [eng] |
Advanced oxidation (AO) technology undergoes an intensive scientific exploration for its ability to decompose persistent organic compounds in water, which are hardly degradable by using conventional technologies. The use of conventional wastewater technologies is usually limited due to their insufficient oxidative capabilities, the formation of secondary waste, or sensitivity to hazardous substances. The AO processes are not selective, and theoretically, all organic substances can be fully mineralized. The ozone based AO processes are among the most promising as they only require electrical energy for ozone generation but avoid additional chemical materials. The adaptation of ozone based AO technology towards industrial applications faces several challenges, such as energy consumption, operation costs, formation of toxic intermediates, or upscaling. This dissertation presents attempts in the development of the AO wastewater treatment reactor based on the bench scale ozone and applied for the treatment of the wastewater polluted with various hardly degradable compounds. The design includes the option of immobilized catalyst use, UV radiation source and is easily up-scalable. The highly efficient dielectric barrier discharge (DBD) plasma reactor and resonant high voltage power supply was used for the ozone generation. A combination of plasma/O3 with UV/visible light photocatalysis was found to be very promising to increase the effectiveness of these processes as compared to the same methods used alone. In most cases, the full degradation of pollutants as determined by the total organic carbon (TOC) value and the complete loss in the toxicity have been reached. It was proved that the AO method of plasma-UV-catalyst can be successfully applied for the treatment of wastewater containing hardly degradable organic compounds. The results provide background for the further investigations of this AO system to the industrial applications, confirming the versatility of such reactor design and the selected AO method. |
