Ozonation Combined with Electrolysis – A New Advanced Oxidation Technology (pp. 205-224)
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Authors: Naoyuki Kishimoto
Abstract: Ozonation combined with electrolysis (ozone-electrolysis) is defined as the electrochemical treatment of water containing ozone. The advanced oxidation effect of ozone-electrolysis was historically reported by Takusagawa et al. (1976), Takahashi and Katsuki (ex. 1982a, 1982b, 1987a, 1987b), and Kishimoto et al. (2005, 2007a, 2007b). The advanced oxidation mechanism is mainly composed of the following reactions (Kishimoto et al., 2005):
O3 + e– → O3– at cathodes
O3– + H2O → OH + O2 + OH–
O3- + H+ ↔ HO3 → •OH + O2
Based on the above mechanism, ozone-electrolysis seems to be less influenced by the chromaticity of water. Moreover, no reagents such as H2O2 and/or ferrous salts are required for operation. Although ozone-electrolysis has a few technical issues requiring resolution before practical use, the current research has revealed the potential of ozone-electrolysis as a new advanced oxidation process.
