Electrocatalytic Oxidation for Removal of COD from Chlorpyrifos Contaminated Wastewater: Optimization and Performance

Introduction: The removal of chemical oxygen demand (COD) associated with the pesticide chlorpyrifos (CPS) is critical for protecting aquatic ecosystems and public health.  Additionally, incomplete degradation of CPS can yield recalcitrant or more toxic transformation products, thereby increasing ecological and human health risks. Therefore, it is essential to removal the COD contributions attributable to CPS from polluted water. Materials and Methods: In this study, response surface methodology (RSM) was applied as an effective approach to optimize COD removal during anodic oxidation (AO). The effects of the operational parameters, namely CPS concentration, current density, and reaction time, were assessed and subsequently optimized. Results: The model’s predicted COD removal closely matched experimental observations, exhibiting an R۲ of ۰.۹۹۱۵. ANOVA confirmed the significance of the fitted quadratic model, a high F valuee (۳۲۴.۷), and regression coefficients approaching unity at the ۹۵% confidence level. The lack-of-fit p-value (۰.۶۰۷۱) indicates that the lack of fit is not significant. Under optimized conditions, with an CPS concentration of ۱۷.۰ mg L⁻¹, current density of ۳۵ mA cm⁻², and a reaction time of ۷۵ min, the maximum COD removal eeficiency reached ۷۰.۲%, with an electrical energy consumption of ۰.۲۱۸ kWh m-۳. Conclusion: •OH was the predominant oxidizing species mediating the removal of COD associated with CPS during the AO process. The AO process, recognized for its environmental compatibility, was successfully applied for COD removal. The AO process is an effective treatment for pesticide-contaminated wastewater.

کلیدواژه ها:

Advanced Oxidation Process ، Chemical Oxygen Demand ، Chlorpyrifos ، Degradation ، Removal.