Hydraulically Controlled, In-Situ Chemical Oxidation of a TCE and TCA Source in Groundwater using Sodium Persulfate and Sodium Permangante
| Location: |
Fairfield, New Jersey |
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| Value: |
$
950,000.00 |
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A mixed trichloroethene (TCE) and trichloroethane (TCA) contaminant plume was discovered in groundwater below a 360,000 square foot building previously used for manufacturing. A pre-design investigation (PDI) was conducted to fill data gaps and ensure that sufficient data was available to evaluate and design the remedial technology. Based on the PDI the contaminant plume was found to be approximately 310,000 square feet in size below the building footprint to a depth of 12 feet bgs.
Overall, the commingled TCE and TCA plume was approximately 51,000 square feet in size. The remaining portions contained primarily TCE. Concentrations of TCE and TCA in the treatment area range from 100 ug/l to 100,000 ug/l. Because the facility was scheduled for redevelopment, remediation goals included the rapid destruction of the contaminants. Several ISCO technologies were evaluated and bench tested to determine the most effective combination of technologies to treat the contaminants. Because of site re-use concerns and shallow depth; technology selection was based in part on an oxidation reaction that is relatively non-exothermic, while aggressive enough to achieve destruction of the contaminants. Sodium permanganate (NaMnO4) was used to treat the chlorinated ethenes, but was ineffective in treating the chlorinated ethanes. A patent pending chemically activated sodium persulfate (Na2S2O8) technology was applied to the mixed TCE/TCA plume after achieving 95% reduction during bench testing. A key component of this application was controlling the movement of chemical oxidants in the aquifer through a series of injection and extraction wells. This ensured physical contact between the oxidants and contaminants, and minimized any displacement.
Application of these ISCO technologies and hydraulic control resulted in rapid remediation of the site, allowing for site redevelopment. The site is now in a Monitored Natural Attenuation (MNA) program. |
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