The degradation of methyl red in dye wastewater by ozone (O3) and ozone/calcium peroxide (O3/CaO2) was studied. The effects of ozone flow rate, temperature, pH value, initial methyl red concentration, CaO2 dosage, water matrix were investigated. The optimal conditions for methyl red degradation by O3 oxidation were:ozone flow rate set as 48L/h, the temperature set as 26℃, the pH set as 6.2. At these optimal conditions, the removal efficiency reached 86.1% after oxidation for 10min. Adding 6.9mmol/L of CaO2 at these optimal conditions could further accelerate the removal efficiency to 94%. The coexistence of oxalic acid in water would not inhibit the removal of methyl red during O3/CaO2 treatment. The O3/CaO2 treatment could achieve over 90% of methyl red removal in various real water matrices in 15min. The synergetic effects of O3 and CaO2 on methyl red degradation were explored for the first time. The O3/CaO2 process could degrade organics effectively and improve the water quality.
郝思宇, 张艾, 刘亚男. 臭氧与过氧化钙协同降解甲基红废水[J]. 中国环境科学, 2019, 39(2): 591-597.
HAO Si-yu, ZHANG Ai, LIU Ya-nan. Removal of methyl red in aqueous by O3/CaO2 treatment: influencing factors and synergetic effects. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(2): 591-597.
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