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IN SITU OXIDATION FIELD PILOT OF 1,4-DIOXANE AT THE COOPER DRUM SUPERFUND SITE
Citation:
SIMON, M. A. IN SITU OXIDATION FIELD PILOT OF 1,4-DIOXANE AT THE COOPER DRUM SUPERFUND SITE. Presented at 27th Mid-Atlantic Industrial & Hazardous Waste Conference, Cincinnati, OH, March 21 - 23, 2007.
Impact/Purpose:
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Description:
1,4-Dioxane, a solvent in paints, varnishes, lacquers, cosmetics, deodorants, cleaning and detergent preparations fluids, has attracted a lot of notice recently because its chemical analytical detection limit has recently been lowered from 50 µg/L to 1 µg/L. It is now commonly detected in chlorinated solvent sites when it was not detected in earlier studies. 1,4-Dioxane can be treated by ex situ advanced oxidation processes but has not been successfully treated in the subsurface. Bench-scale treatability tests performed in 2005 indicated that ozone and ozone/hydrogen peroxide can successfully reduce the concentrations of 1,4-dioxane in the soils and groundwater at the Cooper Drum Site. A six-well field pilot was conducted from July 2005 to June 2006 at this site and reduced the concentrations of dioxane by an average of 50% (± 20%) over 133 days. The average destruction of dioxane was 55% over the 320 day pilot. The addition of hydrogen peroxide to this system did not significantly increase the dioxane destruction. The laboratory measured soil oxidant demand at this site, which was high (3g ozone/kg soil), and did not appear to be exhausted at this site even though dioxane and other chlorinated compounds (trichloroethene, cis 1,2-diochloroethene and vinyl chloride) were destroyed. The Cooper Drum groundwater contained high iron (Fe+2) concentrations (> 1.0 mg/L), and high sulfate concentrations (> 10,000 mg/L). Originally, the aquifer had low dissolved oxygen and negative oxidation-reduction potentials (ORP). The formation consisted of primary sands with highly conductive (2.15 x 10-2 cm/sec, 61 ft/day) silty sands and sandy silt beds lenses.