Simulation And Experimental Studies Of Nanofiltration Process Enhanced By Electro-catalytic Oxidation For Organic Wastewater Treatment

In recent years, there has been increasing interest in treating the bio-refractory organic wastewater efficiently. There are a number of advantages during electro-catalytic oxidation coupling nanofiltration, which is a promising technology. It is a clean process without adding any reagent and without the formation of heavy metal ions or sludge.In this paper, experimental studies find that AR73 and TC·HCl are the first order reaction kinetics of degradation during electro-catalytic oxidation. Electro-catalytic oxidation reaction rates constant increases with increasing current density. During electro-catalytic oxidation coupling nanofiltration technology for water treatment process, the concentration polarization layer resistance of AR73 or TC·HCl occupies total filtration resistance largely. Gel layer resistance of AR73 or TC·HCl occupies total filtration resistance little. The results also show that in the experimental conditions of this article the effects of electroosmosis and electrophoresis on the improvement flux are weak. In this paper, we ignore the effects of electroosmosis and electrophoresis on the improvement flux. The results also show that in the experimental conditions of this article the rejections of AR73 and TC·HCl are both above 95% during electro-catalytic oxidation coupling nanofiltration. We study the performance of the mixing technology of electrocatalytic oxidation coupling nanofiltration for treatment AR73 and TC·HCl wastewater. The model of prediction the permeate flux and concentration polarization of the couple process has been established by combining the catalytic degradation kinetics, two-dimensional model of concentration polarization and non-equilibrium thermodynamics model. Then we test and verify it through system experiments. Model predictions and experimental results show that electrocatalytic oxidation play a positive role on weakening concentration polarization resistance during coupling process. In the experimental conditions of this article, electrocatalytic oxidation could reduce the concentration polarization resistance by 85%. Electro-catalytic oxidation could reduce the resistance of concentration polarization. The filtration rate is found to increase with the increasing in current density and transmembrane pressure. They have the similar trend between the model calculation results and the experimental data with the several of operating conditions.In this article, we also treat actual industrial wastewater using coupling process. The experimental data show that coupling processes are promising technologies in water treatment.