Evaluation of O3/UV and O3/H2O2 as Practical Advanced Oxidation Processes for Degradation of 1,4-Dioxane

The degradation of 1,4-dioxane was investigated on a laboratory scale. The extents of degradation and/or removal of 1,4-dioxane by ozonation at pH 6-8, UV irradiation, aeration, and addition of H2O2 were very limited. On the other hand, the degradation of 1,4-dioxane by O-3/UV and O-3/H2O2 was accelerated compared with the above respective methods. The amounts of 1,4-dioxane degraded per amount of ozone consumed in O-3/UV and O-3/H2O2 were also higher than in ozonation. The amount of 1,4-dioxane degraded in O-3/UV was affected by the intensity of UV irradiation, and that in O-3/H2O2 was affected by the amount of H2O2 added only in the case of a high initial concentration of 1,4-dioxane.