In-Situ Chemical Oxidation of Trichloroethylene Using Hydrogen Peroxide
Publication: Journal of Environmental Engineering
Volume 121, Issue 9
Abstract
Laboratory studies were conducted to determine the feasibility of injecting and mixing hydrogen peroxide (H 2 O 2 ) solutions into clay soils contaminated with trichloroethylene (TCE) to achieve in-situ chemical oxidation. Bench-scale slurry studies were conducted first using 0.3 L slurry reactors and TCE concentrations in the 1.9 to 34 mg/kg range. TCE reductions as high as 98% of the initial concentration were achieved with a H 2 O 2 dose of 28 g H 2 O 2 /kg soil. TCE degradation increased with increasing hydrogen peroxide strength and appeared independent of the initial TCE concentration. Column studies were conducted with an apparatus fabricated to simulate in-situ mixing and chemical oxidant injection. Stainless steel columns 20 cm in diameter and 23 cm long, which were packed with clay soil, were mixed with an auger blade while H 2 O 2 solutions were injected through orifices at the back of the mixing blade. The H 2 O 2 doses for the column studies were 1.2 and 2.5 g H 2 O 2 /kg soil, based on an injection concentration of 5% weight H 2 O 2 at volumetric additions of 5% and 10% of the soil volume treated. TCE reductions of 88% and 75% were achieved at the two dosing rates. Based on the results of these laboratory studies, in-situ chemical oxidation of contaminated soils appears to be a viable soil remediation technique that is dependent on the efficient delivery and distribution of H 2 O 2 throughout the region to be treated.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 121 • Issue 9 • September 1995
Pages: 639 - 644
Copyright
Copyright © 1995 American Society of Civil Engineers.
History
Published online: Sep 1, 1995
Published in print: Sep 1995
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