Toward real applicability of electro-ozonizers: Paying attention to the gas phase using actual commercial PEM electrolyzers technology

• Published in: Chemosphere (Oxford) 2022-02, Vol.289, p.133141-133141, Article 133141
• Main Authors: Rodríguez-Peña, M., Barrios Pérez, J.A., Llanos, J., Saez, C., Barrera-Díaz, C.E., Rodrigo, M.A.
• Format: Article
• Language: English
• Subjects: CONDIAPURE; Electro-ozonizer; Electrolyte formulation; Operation conditions; Ozone; Technology; Temperature; Water; Water Pollutants, Chemical - analysis
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/j.chemosphere.2021.133141

This work focuses on increasing the TRL of electro-ozonizer technology by evaluating the effect of electrolyte composition and operation conditions on the production of ozone, using an actual commercial cell, CONDIAPURE®, in conditions similar to what could be expected in a real application. Not only is attention paid to the changes in the concentration of ozone in the liquid phase, but also to those observed in the gas phase. The electrolyte and its recirculation flowrate, as well as operation temperatures and pressures are found to have significant influence on production rates. The most efficient way to produce ozone is operating at low temperatures and high pressures. In this work, 0.25 and 0.21 mg O3/min were obtained operating at 10 A in electrolytes consisting of aqueous solutions of perchloric and sulfuric acid, respectively, in tests carried out at 13 °C and 2 bars of gauge pressure. The negative effect of scavengers that appear electrochemically along the production of ozone is very important and seems to be partially compensated when organics are present in the solution due to the competition between the reaction of these scavengers with ozone or organics. [Display omitted] •A commercial CONDIAPURE® cell has been evaluated for ozone production.•Important improvements when operating at high pressures and low temperatures.•Importance of electrolyte composition to accomplish large productions of ozone.•Very important contribution of the gas phase: ozone is stripped from the electrolyte.