Color and COD Removal Using a Three-Dimensional Stacked Pt/Ti Screen Anode

摘要

This investigation examines the electrochemical removal of color and chemical oxygen demand (COD) from real textile wastewater using a stacked anode made of 10 Pt/Ti screens in an electrochemical flow-through reactor. Experiments were performed to evaluate the effect of the operating parameters, such as the applied current density, the arrangement of electrode position, and the volumetric flow rate of the solution among others, on the removal of color and COD in the wastewater. The removal efficiencies of color and COD reached 97 and 52%, respectively, under the conditions of using the electrode arrangement of type 1, at 0.08 A cm~(-2), 0.1 M Cl~-concentration, and the volumetric flow rate of 0.6 dm~3 min~(-1). Experimental results showed that the removal efficiencies of color and COD are greatly increased by adjusting the Cl~- concentration to 0.1 M and the main pathway of color and COD removals was by the indirect oxidation of pollutants in the wastewater. The highest instantaneous current efficiency was 81.4% in this work. Optimal applied current density was determined as 0.08 A cm~(-2), while considering simultaneously the effectiveness of COD removal and the instantaneous current efficiency.