The Development Of A Novel Electro-peroxone Technology For Water And Wastewater Treatment

We have developed a novel advanced oxidation process(AOP) for water and wastewater treatment and named it by Electro-peroxone(E-peroxone for short). In the E-peroxone system, an ozone generator was used to generate ozone from pure oxygen. The O2 and O3 gas mixture from the ozone generator was then sparged into an electrochemical reactor that had a carbon–polytetrafluorethylene(carbon–PTFE) cathode, which can convert O2 to H2O2 effectively. The in-situ generated H2O2 then reacted with the sparged O3(i.e., peroxone reaction) to produce hydroxyl radicals(?OH), which is a very powerful oxidant and can degrade and mineralize organic pollutants effectively.A synthetic dye, methylene blue(MB for short), was selected as the target compound and its mineralization by E-peroxone technology was investigated. After 10 min and 90 min treatment, E-peroxone process can achieve complete decolorization and 93% TOC removal, respectively. In comparison, only 10% and 20% of the initial TOC were removed after 2 h treatment by individual ozoantion and electrolysis with O2 sparging, respectively. Moreover, comparing with conventional peroxone process, E-peroxone can degrade and mineralize MB more rapidly due to the in-situ electrochemical-generated H2O2 which could eliminate the side reaction between H2O2 and ?OH. The optimal condition of E-peroxone technology for MB wastewater treatment is: 10 cm2 carbon-PTFE as the cathode, applied current was 400 m A, ozone concentration in the gas was 74 mg/L.The mineralization of 1,4-dioxane and the ?OH production during the wastewater treatment process by each technology were compared. In addition, effects of parameters(i.e. cathode materials, anode materials, applied current, ozone concentration) were also investigated. The results showed that a significant number of ?OH was generated during the E-peroxone wastewater treatment with about 0.744 × 10-9 m M hydroxyl radical([?OH]ss) being detected after 20 min treatment of E-peroxone, which is 10.4 and 195.8 times larger than that in ozonation and electrolysis processes, respectively. E-peroxone process, thus, can achieve 95% TOC removal after 1.5 h treatment, which was also larger than that in individual ozonation and electrolysis process(8.7% and 6.3% TOC removal in 2 h treatment, respectively). The optimal condition of E-peroxone technology for 1,4-dioxane wastewater treatment is: 10 cm2 carbon-PTFE as the cathode, 10 cm2 Ti/Pt as the anode, applied current was 400 m A, ozone concentration in the gas was 125 mg/L.In conclusion, E-peroxone process is a novel, effective, economical and environmental-friendly AOP for water and wastewater treatment, which may provide an alternative technology for real water and wastewater treatment.