ZnO-MgO/Al2O3吸附-臭氧催化氧化处理难降解有机废水

以活性氧化铝为载体,采用浸渍法制备催化剂,对甲基橙及草酸模拟废水进行处理.在中性条件下,臭氧催化氧化比单独臭氧氧化能提前30 min使得甲基橙溶液褪色,反应105 min时,臭氧催化氧化对TOC的去除率高达96.53%,比单独使用臭氧氧化对甲基橙TOC去除率提高了47.19%,在处理草酸废水时臭氧催化氧化对TOC去除率高达80.59%,比单独使用臭氧氧化对草酸TOC去除率提高了59.14%.在处理甲基橙及草酸的小试实验中催化剂对有机污染物的吸附作用起到了加快反应进行的作用.在对垃圾渗滤液超滤出水时,O₃与COD质量比为1:1时,臭氧催化氧化对COD去除率为49.09%,比单独使用臭氧氧化提高36.37%,臭氧催化氧化对TOC的去除率是单独使用臭氧氧化的2.54倍,在处理垃圾渗滤液纳滤浓水时,臭氧催化氧化对COD去除率高达88.72%,比单独使用臭氧氧化提高37.60%,并且臭氧催化氧化对TOC的去除率是单独臭氧氧化的1.6倍.臭氧催化氧化反应过程中产生的羟基自由基对有机物更快的反应速率.

ZnO-MgO/Al2O3adsorption-ozone catalytic oxidation treatment of refractory organic wastewater

A composite catalyst of ZnO-MgO supported on activated alumina was prepared by impregnation method for ozone catalytic oxidation of methyl orange and oxalic acid simulated wastewater.Under neutral pH conditions,the color of methyl orange solution with the catalyst faded 30 min earlier than that without the catalyst stand the TOC removal rate was 96.53%of ozone-catalyzed oxidation,47.19%higher than that by ozonation alone within a reaction time of 105 min.The TOC removal rate of ozone-catalyzed oxidation was 80.59%,which was 59.14%higher than that of ozone oxidation alone.It was found that,the adsorption of methyl orange and oxalic acid on the catalyst accelerated the removal of organic matter.The COD removal rate of ozone catalytic oxidation for treating landfill leachate ultrafiltration effluent under a 1:1 mass ratio of O₃/COD was 49.09%,which was 36.37%higher than that of ozone oxidation alone and the removal rate of TOC by ozone catalytic oxidation was 2.54 times of ozone oxidation alone.In contrast,the COD removal rate of ozone catalytic oxidation for treating landfill leachate nanofiltration concentrate was 88.72%,which was 37.60%higher than that of ozone oxidation alone,and the removal rate of TOC by ozone catalytic oxidation was 1.6 times that of ozone-alone oxidation.Ozone catalyzed oxidation of hydroxyl radicals produced in the process of organic faster reaction rate.