Optimization of parameters for electro Fenton degradation of anion resin by response surface methodology.

Abstract

This study focused on improving the degradation efficiency of waste resin wet oxidation and optimizing hydrogen peroxide utilization through an electro-Fenton system based on Ti/PbO₂ (Ti-DSA) electrodes for the degradation of ZGCNR170 anion resin. A Box-Behnken experimental framework was utilized to comprehensively assess the effects of key operational parameters, including current intensity, catalyst dosage, and H₂O₂ dosing rate, enabling the determination of optimal degradation conditions. Analysis of individual factors revealed that each variable significantly affected resin degradation, with their relative influence ranked in the following order: FeSO₄ dosage > H₂O₂ dosage > initial pH > current intensity. Three-dimensional response surface analysis combined with ANOVA revealed significant interactions among the process variables in the electro-Fenton system. The ratio of FeSO₄ to H₂O₂ was identified as a key determinant for achieving efficient degradation of spent resin. Besides, the optimal degradation efficiency was achieved at pH 1.5, with a current of 7 A, FeSO₂ dosage of 52.1 g, and an H₂O₂ dosing rate of 50 mL/min. Under the condition of optimal range, increasing current intensity and maintaining a moderately low pH enhanced resin degradation; however, excessive current adversely affected efficiency. These findings provide a reliable basis for optimizing electro-Fenton systems for the effective treatment of radioactive anion exchange resins.