RESUMEN
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.