Electrochemical treatment of paper mill wastewater using three-dimensional electrodes with Ti/Co/SnO 2-Sb 2O 5 anode

Abstract

The properties of the interlayer and outer layer of Ti/Co/SnO 2-Sb 2O 5 electrode were studied, and the electrochemical behavior was examined as well. As a result of unsatisfactory treatment using Ti/Co/SnO 2-Sb 2O 5 electrode, electrochemical disposal of paper mill wastewater employing three-dimensional electrodes, combining active carbon granules serving as packed bed particle electrodes, with Ti/Co/SnO 2-Sb 2O 5 anode, was performed. The outcome demonstrates that efficient degradation was achieved. The residual dimensionless chemical oxygen demand (COD) concentration reached 0.137, and color removal 75% applying 167 mA cm −2 current density at pH 11 and 15 g l −1 NaCl. The instant current efficiency, energy cost, electrochemical oxidation index (EOI) and kinetic constant of the reaction were calculated. At the same time, the influence of pH and current density on COD abatement and decolorization was also investigated, respectively.