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Degradation of dioxane by persulfate in iron filing column and the related solution chemistry. Influent persulfate and dioxane concentrations are 5 mM and 0.5 mM, respectively. (A) Breakthrough curves of persulfate, sulfate, total sulfur and dioxane at pore-water velocities of 31 and 3 cm/h. (B) Concentration of iron species and pH in the effluent at the pore-water velocity of 3 cm/h.
