臭氧与过氧化钙协同降解甲基红废水

对单独臭氧（O₃）、臭氧与过氧化钙（O₃/CaO₂）联用技术降解甲基红染料废水进行了研究，考察了O₃流量、温度、废水初始pH值、CaO₂投加量、处理时间以及不同水基质等因素对甲基红降解效果的影响.结果表明，在O₃流量为48L/h，温度为26℃，初始pH值为6.2的纯水中降解10min，单独O₃处理对甲基红的降解率为86.1%.在此条件下投加CaO₂，投加量为6.9mmol/L时，O₃/CaO₂联用技术对甲基红废水的脱色率可达到94%.水基质中草酸的存在并不会对O₃/CaO₂联用体系的降解作用造成抑制.O₃/CaO₂联用体系在多种复杂水基质中都能达到较好的脱色效果.通过对比试验发现，O₃/CaO₂联用对甲基红的降解起协同作用，CaO₂不仅可以产生H₂O₂促进染料被O₃降解，而且CaO₂的吸附作用也有利于染料和污染物质的氧化去除.该联用工艺可高效地去除印染废水的色度，达到出水水质处理标准.

Removal of methyl red in aqueous by O3/CaO2 treatment: influencing factors and synergetic effects

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.