Ti/IrO2–RuO2 Electrode for Electrochemical Oxidation of Reverse Osmosis Pesticide Concentrate Wastewater: Performance Evaluation, Parameter Optimization and Degradation Mechanism

Electrocatalytic oxidation technology demonstrates significant potential in treating refractory industrial wastewater, playing a crucial role in industrial pollution control. This paper established an electrocatalytic oxidation system using Ti/IrO2–RuO2 as the anode for pretreating high-salinity, refractory pesticide and chemical membrane concentrate. The optimal conditions were identified through a systematic investigation of key parameters including salt concentration, current density, initial pH, and electrode spacing as follows: salt concentration of 15 g/L, current density of 43.69 mA/cm2, initial pH of 5.0, and electrode spacing of 2.0 cm, achieving a maximum COD removal rate of 93.45% with energy consumption of 0.191 (kW h)/kg COD. The results indicated that this system effective degraded organic compounds in membrane concentrate. These findings provided innovative approaches for the efficient treatment of refractory organic wastewater from pesticide and chemical industries.