Removal of Chlorinated Ethylenes in Contaminated Ground Water by Hydrogen Peroxide Mediated Oxidation Processes

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Abstract
Treatability of ground water contaminated with TCE and PCE by two hydrogen peroxide mediated oxidation processes (O3/H2O2 and UV/H2O2) were studied in laboratory reactors. High removal efficiencies, which were achieved in relatively short treatment periods, support the use of both processes for purification of ground water. The organic and inorganic matrix in the treated waters did not prevent oxidation of the compounds in the micromolar range. The chloride measurements indicated a high level of mineralization of the original contaminants, although, during the O3/ H2O2-treatment, the stripping of compounds contributed to their total removal. Chlorinated acetic acids were detected as by-products in the UV/H2O2 process, but could be further oxidized with prolonged treatment. The results confirm the potential use of UV/ H2O2 for the treatment of contaminated ground water, although final feasibility should be verified by demonstration in the field.

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