Electrooxidation treatment of slaughterhouse wastewater: investigation of efficiency of Ti/Pt anode

Abstract

In the present study, investigation of the applicability and efficiency of electrochemical oxidation (EO) processes for slaughterhouse wastewater (SWW) was targeted by evaluating the treatment efficiency and energy consumption values. The effects of operating parameters, such as the type of supporting electrolyte (SE) (Na2SO4, NaNO3, NaCl, and KCI), supporting electrolyte concentration (SE concentration) (0.1–0.4 M), initial wastewater pH (3–11), and current density (CD) (4.06–12.18 mA/cm2) on the removal of chemical oxygen demand (COD), suspended solids (SS), turbidity, and color were investigated. The most effective electrolyte type was observed to be NaCl. The experiment with 0.2 M SE type and 4.06 mA/cm2 current density, at a stirring speed of 400 rpm was accepted as optimum. For these conditions, it was observed that the COD, color, turbidity, and suspended solids (SS) removals were 80.05, 98.64, 99.18, and 98.47%, and energy consumption of 210.7 kWh/m3, respectively. It has been observed that the electro-oxidation process provides substantial efficiency in undesirable parameters in wastewater after 3 h of operation. Additional processes can be added to this process so that the SWW can be reused after treatment, and the recovery and further treatment of the wastewater can be achieved.