Comparison of different anodes and investigation of energy consumption in the treatment of real wastewater by electrooxidation

Abstract

The present study aims to compare the efficiencies and energy consumption of different anodes in the treatment of slaughterhouse wastewater (SWW) by electro-oxidation method with using two different anodes (Ti/Pt and Ti/IrO2/RuO2). It aims to remove many parameters from wastewater at the same time and to examine the efficiency of the electro-oxidation method for food industry wastewater. The electrooxidation mechanism was prepared and the parameters to be removed from the wastewater were determined using two different anodes and using different supporting electrolytes (SE). The efficiency of removal of COD, turbidity, suspended solids (SS), and color from wastewater was studied. The highest removal was obtained at approximately 7.0 of pH, which is the natural value of the wastewater. Color, turbidity, and SS removals provided over 95% removal for both anodes. In optimum electrolyte concentration (0.2 M NaCl), the COD removal efficiency and the energy consumption are obtained as 80.05% and 210.7 kWh/m3 for the Ti/Pt anode and 66.46% and 183.6 kWh/m3 for Ti/IrO2/RuO2 anode. It has been observed that as the current density increases, the efficiency also increases, but the energy consumption increases depending on the voltage increase. Cost is also important here. Priority should be determined for the option to be preferred. Both anodes were found to be quite efficient at removing dirt. Additional processes can be considered to increase treatment efficiency. It is an ideal method for small-scale areas. However, sizing is recommended so that it can be applied to larger areas.