Treatment of Groundwater Contaminated with 1,4-Dioxane, Tetrahydrofuran, and Chlorinated Volatile Organic Compounds Using Advanced Oxidation Processes

摘要

Ozonation and four types of advanced oxidation processes, including O-3/H2O2, O-3/UV, O-3/H2O2/UV, and UV/H2O2, were evaluated for the treatment of contaminated groundwater at a Superfund site in Simpsonville, South Carolina using bench-scale, batch ozone and UV apparatuses. Although the contaminants of concern were 1,4-dioxane, 1,1-dichloroethene, and trichloroethene, several other chlorinated organics as well as tetrahydrofuran were found in the groundwater samples. The O-3/H2O2 treatment with O-3 and H2O2 doses of 6 and 1.5mg/L, respectively, and the UV/H2O2 treatment with UV and H2O2 doses of 1,000 mJ/cm and 20mg/L, respectively, were sufficient to degrade 200 mu g/L of 1,4-dioxane, 110 mu g/L of 1,1-dichloroethene, and 10 mu g/L of trichloroethene below their performance standards of 10, 7, and 4 mu g/L, respectively. Due to a high bromide concentration (0.35mg/L) in the groundwater sample, bromate formation was found to be significant in ozone-based treatment, including O-3/H2O2.