Dissolution of radioactive spent cation exchange resin by Fenton process and mineralization by O ₃ /Fenton-like process

A two-stage process for the treatment of solid radioactive spent cation exchange resin was developed in this study. The Fenton process was first employed to dissolve solid resin, followed by the O₃/Fenton-like process for degrading the resulting organic liquid. The impacts of reaction time, initial pH, concentration, and H₂O₂ dosage on degradation efficiency were systematically evaluated. Under optimal conditions, a mineralization efficiency exceeding 99.85% was achieved. Initial pH was identified as the most significant factor influencing degradation performance. The reaction followed a pseudo-first-order model based on kinetic fitting. These findings provide foundational data to support the industrial application of the two-stage process for treating radioactive spent cation exchange resin.