Projects details

Oxidation and Anaerobic Reduction


Location: Malta, Ohio
Value: $ 265,000
Based upon previous work for this client at other facilities in New England, Panther was sole sourced to evaluate the potential of utilizing a combination of in-situ chemical oxidation (ISCO) and in-situ enhanced anaerobic dehalogenation to reduce contaminant concentrations in groundwater at the clientís facility in Ohio. Groundwater at the subject site was contaminated with pentachlorophenol (PCP) and 111-trichloroethane (TCA). Local wellhead protection was a major objective. Bench and pilot studies were conducted to determine the destruction rates and dosages required for oxidation of PCP at the site. Site monitoring indicated that the TCA plume was already experiencing natural anaerobic dehalogenation, so enhancing this process proceeded directly to a field pilot test. Pantherís oxidation bench tests and calculations indicated that 54,000 lbs of 40% sodium permanganate in a 10% solution was required to mineralize PCP in groundwater. Panther mobilized a tow-behind injection trailer to complete injection of sodium permanganate into the injection wells. Utilizing a flow rate of 2.5 gallons per minute into each well, a total of 5 days was required to complete the ISCO pilot test. The pilot resulted in substantial mass destruction as a result of targeting the source area. Given the positive nature of the results, there may be no need for an additional injection in the down gradient areas of the plume, allowing monitored natural attenuation to complete plume remediation. In the TCA plume, Panther injected 15,000 lbs of 60% sodium lactate as a 5% solution. At a flow rate of 1.5 gpm, 21,600 gallons of solution was injected in 6 days. Significant reductions due to enhancement of anaerobic conditions were observed one month after injections. A Five Year Review of the site indicated that TCA biodegradation may have been limited by the reduced organic carbon concentration in the aquifer. Enhanced reductive dichlorination (ERD) using a sodium lactate donor was injected a second time to stimulate degradation rates and accelerate ongoing biodegradation of TCA. After a second Five Year Review, a third round of ERD followed by bioaugmentation was completed to further reduce TCA and DCE on-site, using 12,000 lbs sodium lactate, anaerobic water, and 20 liters of KB-1. At an average flow rate of 5.5 gpm, over 15,000 gallons of 100% vegetable oil was injected in 3 days as a 12-13% solution. The advantages of the project approach included its minimally invasive footprint, limited disruption to the facility operations and the speed of completion including implementation and closure. The total cost was another significant benefit and the work was brought in on budget and without incident. J325001

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