A field-scale test of in situ chemical oxidation through recirculation
- Oak Ridge National Lab., TN (United States)
- Colorado School of Mines, Golden, CO (United States)
- Bechtel-Jacobs, Piketon, OH (United States). Portsmouth Gaseous Diffusion Plant
In situ chemical oxidation is a developing class of remediation technologies in which organic contaminants are degraded in place by powerful oxidants. Successful implementation of this technology requires an effective means for dispersing the oxidant to contaminated regions in the subsurface. An oxidant delivery technique has been developed wherein the treatment solution is made by adding an oxidant to extracted groundwater. The oxidant-laden groundwater is then injected and recirculated into a contaminated aquifer through multiple horizontal and/or vertical wells. This technique, referred to as in situ chemical oxidation through recirculation (ISCOR), can be applied to saturated and hydraulically conductive formations and used with relatively stable oxidants such as potassium permanganate (KMnO{sub 4}). A field-scale test of ISCOR was conducted at a site (Portsmouth Gaseous Diffusion Plant) where groundwater in a 5-ft thick silty gravel aquifer is contaminated with trichloroethylene (TCE) at levels that indicate the presence of residual dense non-aqueous phase liquids (DNAPLs). The field test was implemented using a pair of parallel horizontal wells with 200-ft screened sections. For approximately one month, groundwater was extracted from one horizontal well, dosed with crystalline KMnO{sub 4}, and re-injected into the other horizontal well 90 ft away. Post-treatment characterization showed that ISCOR was effective at removing TCE in the saturated region. Lateral and vertical heterogeneities within the treatment zone impacted the uniform delivery of the oxidant solution. However, TCE was not detected in groundwater samples collected from monitoring wells and soil samples from borings in locations where the oxidant had permeated.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Environmental Restoration and Waste Management, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 671960
- Report Number(s):
- ORNL/CP-98459; CONF-980905-; ON: DE98003584; BR: EW4010000; TRN: 99:000554
- Resource Relation:
- Conference: SPECTRUM `98: nuclear and hazardous waste management international topical meeting, Denver, CO (United States), 13-18 Sep 1998; Other Information: PBD: 1998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Initial Results of ISCO for a Large TCE DNAPL Source Area
Bioremediation of a Large Chlorinated Solvent Plume, Dover AFB, DE