Efficiency of Cyclohexanone Oxime Waste water Treatment by Honeycomb CH-Al-Cu Monolithic Continuous Catalytic Ozonation Process
The current situation of integral catalysts preparation and their continuous operational effectiveness are critical aspects in catalytic ozonation applications.The monolithic CH-Al-Cu catalyst was prepared using honeycomb ceramic(CH)as catalyst carrier,γ-Al2O3 as coating material,and copper(Cu)as active component.The performance of CH-Al-Cu catalyst in continuous flow catalytic ozonation process was evaluated by adjusting operating parameters.The results of catalyst characterization showed that γ-Al2O3 coating increased the specific surface area of the catalyst from 2.478 m2/g to 21.657 m2/g,and the Cu element in CH-Al-Cu catalyst existed on the surface mainly in the form of CuO after calcination,where Cu content was as high as 48.40％.CH-Al-Cu showed excellent catalytic ozonation activity in the continuous flow reactor.The optimal operating parameters were 18.6 mg/L of ozone concentration,35 min of HRT,and the best laying position of catalyst was set at the bottom with 2 layers(40 g).Under these conditions,the removal rate of cyclohexanone oxime reached 95.3％,the removal rate of COD was 39.3％,which was 3.2 times that of ozone alone.The O/C of catalytic oxidation system was 1.1,which could greatly reduce the cost of ozone consumption.CH-Al-Cu catalyst can promote ozone mass transfer and strengthen·OH production,and has good cycle stability and wear resistance.
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