Greenville, United States
Greenville, United States

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Bryant D.,Geo Cleanse International Inc. | Moody W.,Geo Cleanse International Inc. | Turkot S.,Geo Cleanse International Inc. | Maalouf G.Y.,Rogers and Callcott Engineers | And 3 more authors.
Pollution Engineering | Year: 2013

Chlorinated solvent DNAPL site remediation remains a daunting challenge that often requires the integration of multiple technologies to achieve cleanup objectives. Technologies must be adapted to variable site conditions and flexible to the evolving nature of the source and plume as the remediation progresses. The proposal was an integrated in-situ chemical oxidation using potassium permanganate in the source area, with in-situ chemical reduction using zero-valent iron (ZVI) barriers in the down gradient plume area. Reagents were injected as high-solids slurries to effectively distribute large reagent volumes within specific and focused target zones in the low-permeability saprolite and a fractured zone in bedrock. A TCE handling unit located near the southwest corner of the facility, which was in operation for about 10 years, was determined to be the primary source, with an estimated discharge of approximately 1,365 gallons of solvent.


Bryant D.A.N.,Geo Cleanse International Inc. | Moody W.,Geo Cleanse International Inc. | Turkot S.,Geo Cleanse International Inc. | Maalouf G.Y.,Rogers and Callcott Engineers | And 3 more authors.
Pollution Engineering | Year: 2013

Geo-Cleanse International Inc was contracted to design and implement a pilot test for a challenging site characterized by high source area trichloroethylene (TCE) concentrations, low permeability saprolite geology overlying highly transmissive bedrock, low natural attenuation, and a large plume area with limited accessibility. The proposal was an integrated in-situ chemical oxidation using potassium permanganate in the source area, with in-situ chemical reduction using zero-valent iron (ZVI) barriers in the downgradient plume area. The groundwater analytes in the permanganate pilot test area consisted of VOC, color, oxidation-reduction potential, specific conductivity and pH. The VOC concentrations in the groundwater downgradient from the barrier exhibited significant reductions. The TCE concentrations were reduced by 46-100% relative to the baseline concentrations in the four downgradient monitoring wells. The TCE concentrations were reduced from ≈ 35,000 to 950 μg/L and from 18 to 9.7 μg/L in the two saprolite monitoring wells. Cis-1,2-dichloroethylene, formed from ZVI degradation of TCE, initially increased following the injection. However, additional post-injection sampling showed a subsequent decrease as a function of time.

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