| Electrochemical oxidation and ozonation are two environmentally friendly techniques and have been widely used in the treatment of refractory wastewater. However, both techniques have some shortcomings, e.g., high operating costs, limited effeciency due to mass transfer and current, and incomplete mineralization of organic pollutants. To solve these problems, this study developed a combined process of electrochemical oxidation and ozonation. Then this process was employed to treat landfill leachate concentrates that were generated from reverse osmosis of biologically pretreated leachate.The study showed that, O2and O3mixed gas was sparged into the electrochemical reactor that had a Carbon-PTFE cathode, which can convert O2to H2O2effectively. The in situ generated H2O2then reacted with the sparged O3to produce a very powerful oxidant hydroxyl radical (·OH), thus degrading refractory organic pollutants in the landfill leachate conentrates effectively.The study verified that this electrochemical process could effectively produce-OH. And proved that this process could achieve synergy of H2O2and O3on organic pollutants degradation. The effects of cathode material、 current intensity and ozone concentration on TOC removal of concentrates were studied in the research, then the reaction conditions were optimized. This new electrochemical technology、Electro-Fenton and Peroxone process were compared in this study, and superiority of the new technology was highlightedThe results showed that this electrochemical technique that H2O2produced in situ cooperated with O3oxidation can treat landfill leachate concentrate effectively. It can be applied to the refractory organic pollutants removal process, and will have a better application prospect. |
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