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A Study on the Degradation Characteristics of 1,4-dioxane at Different Initial $H_2O_2$ Concentration with Advanced Oxidation Process using Ozone and Hydrogen Peroxide  

Park, Jin-Do (School of Chemical Engineering and BioEngineering, University of Ulsan)
Suh, Jung-Ho (Dept. of Environmental & Life Chemistry, Ulsan College)
Lee, Hak-Sung (School of Chemical Engineering and BioEngineering, University of Ulsan)
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Abstract
Advanced oxidation process involving $O_3/H_2O_2$ was used to eliminate 1,4-dioxane and to enhance the biodegradability of dioxane-contaminated water. Oxidation process was carried out in a bubble column reactor under different pH and $H_2O_2$ concentrations. The removal efficiencies of 1,4-dioxane were investigated at hydrogen peroxide concentration between 40 and 120 mg/L. At the same pH, removal efficiencies of 1,4-dioxane increased with increasing initial $H_2O_2$ concentration. There was a linear relationship between initial concentration of $H_2O_2$ and the amount of consumed $O_3$. It was observed that the high $H_2O_2$ concentration accelerated the generation of hydroperoxy ions(${HO_2}^-$) and hydroxyl radicals($OH{\cdot}$). Hydrogen peroxide enhanced the decomposition of 1,4-dioxane and the biodegradability of the solution.
Keywords
1,4-Dioxane; Biodegradability; $BOD_5$; Enhancement;
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