Hybrid electrocatalytic ozonation treatment of simulated high-salinity carbamazepine wastewater with Ni0.2-Ce0.2/OMC Particle Electrodes

Abstract

High-salinity pharmaceutical wastewater contains refractory contaminants that can be effectively treated by hybrid electrocatalytic ozonation (3D/O3). The salt in the wastewater provides a natural electrolyte, thus avoiding secondary pollution caused by the addition of electrolytes. In this work, we studied high-salinity pharmaceutical wastewater with carbamazepine as the main pollutant. Degradation experiments showed that the Ni0.2-Ce0.2/OMC/granular activated carbon (GAC) particle electrodes was effective, 3D/O3 in combination with Ni0.2-Ce0.2/OMC/GAC removed carbamazepine effectively. The optimal conditions for the degradation of the simulated high-salinity wastewater containing 25 mg·L-1 carbamazepine by the 3D/O3 + Ni0.2-Ce0.2/OMC/GAC process were: 10 mA current, pH of 2, and a 5 g:150 mL ratio of particle electrode to solution. Under these conditions, the carbamazepine removal ratio was 99.7%, and the mineralization rate of the simulated wastewater was 75.7%. The removal of carbamazepine follows pseudo first-order reaction kinetics. The Ni0.2-Ce0.2/OMC/GAC particle electrodes exhibit good stability, and the main active species in the 3D/O3 + Ni0.2-Ce0.2/OMC/GAC process is ·OH.