Effectiveness And Mechanism Of O₃/H₂O₂ Process For Removal Of 2-MIB From Water

Due to the increasing drain of sewage and industry waste water recent years, man-caused eutrophication become more and more serious. Plankton such as algae propagates largely, the concentration of odor-caused organics increases greatly in the result of microorganism metabolizing.The O₃/H₂O₂ is a principal advanced oxidation process. It is widely applied in water treatment.The combination of ozone and hydrogen peroxide can produce OH radical which could enhance the degradation of organic pollutants without recontamination. Organic pollutants can be completely mineralized into water and carbondioxide. The O₃/H₂O₂ process is a kind of highly effective method for drinking water treatment. Moreover, the O₃/H₂O₂ is applicable to large-scale water treatment for its simple set and convenience maintain.The paper investigated the removal efficiency of 2-MIB by O₃/H₂O₂ process in the water, then dicussed the effect of the molar ratio of hydrogen peroxide and ozone, pH value, and water background on the oxidation process.The optimum condition of the process has been given. Degradation products were analysed, also the presence of some degradation intermediates during the oxidation course were confirmed. Based on these results, the most possible degradation way and mechanism of 2-MIB have been proposed.Hydrogen peroxide can highly enhance the removal efficiency of 2-MIB in water,the removal efficiency was 20.6% by ozonation,but it achieved 68.89% with the addition of H₂O₂ after 20-minitue's reaction. In this experiment, the optimum H₂O₂/O₃ molar ratio is about 0.6;With the same total applied ozone and hydrogen peroxide, the removal efficiency at the case of sequential addition was much better than that of addition once before the start of the experiment; With pH increasing, the removal efficiency of 2-MIB increases.The optimum pH is between 7 and 9. Water quality is also an important factor for the removal efficiency of 2-MIB by the O₃/H₂O₂ oxidation process.The removal efficiency of 2-MIB in tap water is better than in distilled water.The effect of some trace substances in water on the removal efficiency of 2-MIB was also discussed. The presence of HA at certain concentration (2mg/L,...