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

Abstract

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 Ϫ2 , 0.1 M Cl Ϫ concentration, and the volumetric flow rate of 0.6 dm 3 min Ϫ1 . Experimental results showed that the removal efficiencies of color and COD are greatly increased by adjusting the Cl Ϫ 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 Ϫ2 , while considering simultaneously the effectiveness of COD removal and the instantaneous current efficiency.

Paired removal of color and COD from textile dyeing wastewater by simultaneous anodic and indirect cathodic oxidation

“…However, a BDD anode is still very expensive, and thus the practical applications are currently very limited. Although anodic oxidation can be used to successfully treat simple lab-made dye-containing wastewater, few attempts have been made to treat real dyeing wastewater with complicated compositions [16][17][18][19][20]. Vlyssides et al [16] used a Pt/Ti anode to treat real textile wastewater, and found that COD decreased by 86% and ADMI color units decreased by 100% at a very high chloride concentration.…”