Treatment of 14-dioxane and trichloroethene co-contamination by an activated binary persulfate-peroxide oxidation process

摘要

The efficacy of a binary oxidant system, hydrogen peroxide (H2O2) and persulfate, was investigated for treatment of 1,4-dioxane (dioxane) and trichloroethene (TCE) co-contamination. Batch experiments were conducted to examine the catalytic efficiency of Fe²⁺ and NaOH based activation, oxidant decomposition rates, contaminant degradation effectiveness, and competitive degradation effects. For NaOH-activation, the oxidant decomposition rate was moderate and sustained during the entire test period of 96 hours. However, dioxane degradation was limited (~33%). Conversely, the oxidants were depleted within 24 hours for the Fe²⁺-activated system, and dioxane degradation was complete within 4 hours. The activation and radical generation processes were different between Fe²⁺ and NaOH activation. Both dioxane and TCE underwent complete degradation in the co-contaminant experiment. The results of this study indicate that the Fe²⁺-catalyzed binary hydrogen peroxide-persulfate oxidant system is effective for oxidation of the tested contaminants separately and as co-contaminants.