CuO-CeO2/γ-Al2O3粒子电极对垃圾渗滤液降解特性

研制了负载型CuO-CeO2/γ-Al2O3粒子电极,并与活性炭颗粒混合填充于主阴阳极之间,实现三维电催化氧化反应,采用XRD、SEM对粒子电极进行表征.结果表明, CuO-CeO2/γ-Al2O3粒子电极对垃圾渗滤液显示了良好的电催化活性和稳定性,在pH为7.0、槽电压10V、空气流速0.04m3·h-1反应条件下,150min后, COD、氨氮去除率达到87.8%、45.4%,去除效果较传统二维平板、三维复极性电解槽更高,经20次反复使用后仍具有一定催化活性.研究了电-多相催化氧化体系对垃圾渗滤液降解的动力学规律,表明渗滤液降解符合准一级反应动力学规律;并在此条件下,体系以直接氧化占优.

Characteristics of electro-heterogeneous catalytic oxidation of landfill leachate with CuO-CeO2/gamma-Al2O3 particle electrodes

A three-dimensional electrode system for electrochemical oxidation was developed in which Cu-Ce composite oxides supported on gamma-Al2O3 and granular activated carbon were packed between the main electrodes. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to characterize the particle electrode. The results showed that the particle electrode had good electrocatalytic activity and stability for the degradation of landfill leachate. When pH value of landfill leachate was 7, the voltage was 10 V, and air-flow was 0.04 m3/h, the removal rate of COD and NH4+-N can reach 87.8% and 45.4%, respectively. The treatment effect of electro-heterogeneous catalytic process was greatly higher than that of electrochemical oxidation process in two dimensional flat reactor and bipolar packed bed cell. In addition, CuO-CeO2/gamma-Al2O3 was active even after it was reused twenty times. It was found that landfill leachate degradation followed a pseudo-first-order reaction kinetic model, and the removal of pollutants under these operating conditions could be mainly attributed to the direct oxidation effect in the electro-heterogeneous catalytic reactor.