Projects details

In-Situ ChemOx followed by Enhanced Reductive Dechlorination


  Task 48_01092009_104543.JPG 
Location: Maine
Value: $ 300,000.00
Panther was contracted to perform an extensive amount of work on the UCC Superfund site, a former chemical manufacturing, solvent recovery, and hazardous waste treatment facility, which is situated on 2.5-acres. The geology consisted of a clay-rich, 10-foot thick shallow fill/disturbed zone overlying 50 feet of poorly conductive glacial till, extending down to bedrock. The bedrock consists of fractured schist and gneiss. The depth to water is variable, but tends to be 10 to 20 feet BGS under non-pumping conditions. Bench tests and pilot studies were conducted from various wells and soils on site to determine the best oxidant to address contamination in soil and groundwater by TCE and TCA. The results from the permanganate addition field test showed a significant reduction of organic compounds dissolved in the groundwater. These reductions were achieved in a limited pilot area without any adverse impacts to the well. This information supported that a larger application would be appropriate to evaluate long-term and larger site-wide effects. An expanded field pilot test was conducted by adding 1% potassium permanganate solution to existing soil vapor extraction and pumping wells. Pumping wells across the site were kept operational throughout the testing activities to maintain hydraulic control and provide monitoring information in the addition area. Individual wells were deactivated temporarily during addition and re-deployed and reactivated once the KMnO4 solution had fully dissipated from the area. During the course of the pilot, significant reductions in key organic compounds were observed across the site. The results from later testing (2 months) indicated that the process was very successful in removing the chlorinated ethenes (TCE, DCE, and VC) and many other non-chlorinated VOCs both in bedrock and overburden aquifers. The results of this test indicated decreases in VOC concentrations for TCE and DCE to nearly non-detectable levels across the site. Residual levels of TCA that remained slightly in excess of GWQC were further lower using enhanced reductive de-chlorination by adding carbon substrates (HRC) via injection before obtaining final site closure.

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