Comparison of the UV-Induced Photolysis, Ozonation, and Their Combination at the Same Energy Input Using a Self-Devised Experimental Apparatus

Abstract

The efficiency of the UV photolysis, ozonation and their combination were compared in the decomposition of phenol using a self-devised experimental apparatus running under identical power conditions. The light source was a low-pressure mercury vapor lamp emitting at 185 nm (responsible for the formation of ozone) and 254 nm (responsible for the direct photolysis of ozone and phenol). The effect of flowrate of oxygen or air on the concentration of formed ozone in the gas phase, the effect of dissolved oxygen and pH on the transformation of phenol and formation of intermediates in aqueous solution were also investigated.

Keywords:

• Ozone
• Photolysis
• UV
• VUV
• Hydroxyl Radical
• Low-Pressure Mercury Vapor Lamp
• pH Effect

ACKNOWLEDGMENTS

This document has been produced with the financial assistance of the European Union (Project HU-SRB/0901/121/116 OCEEFPTRWR Optimization of Cost Effective and Environmentally Friendly Procedures for Treatment of Regional Water Resources). The contents of this document are the sole responsibility of the University of Szeged and can under no circumstances be regarded as reflecting the position of the European Union and or the Managing Authority. This work was supported by the National Scientific Research Foundation (OTKA T67559 and CK80193) and the TAMOP-4.2.2.A-11/1/KONV-2012-0047 project. This financial help is highly appreciated.