Superfund Innovative Technology Evaluation (SITE)
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Inc. Metal-Enhanced Dechlorination of Volatile Organic Compounds Using
an Above-Ground Reactor
EnvironMetal Technology's metal-enhanced dechorination technology employs an electrochemical process that involves oxidation of iron and reductive dehalogenation of halogenated VOCs in aqueous media. The process can be operated as an above ground reactor or can alternatively perform in situ groundwater remedation. The metal-enhanced dechlorination process is designed to degrade chlorinated VOCs to nonhazardou substances (non-halogenated hydrocarbons and inorganic halides), and therefore offers an alternative to conventional technologies that simply transfer VOCs from groundwater to other media. The technology is capable of degrading a wide variety of disolved chlorinated alkanes and alkenes occuring in groundwater, including trichloroehene (TCE) , tetrachloroethene, and 1,2-dichloroethene (DCE). An above ground version of this technology was evaluated under the USEPA SITE Program over a 13 week period (November 1994 - February 1995) at a printed circuit board site in New Jersey. The demonstration involved the treatment of 61,000 gallons of groundwater containing PCE, TCE and cDCE. Demonstration results showed that PCE and TCE were reduced below regulatory levels after a single pass through the reactive iron medium. Removal efficiency for PCE was greater than 99.9% throughout the demonstration. Incomplete dechlorination of VOCs during later portions of the demonstation may have resulted in cDCE and vinyl chloride being occasionally detected in the effluent. Groundwater remediation costs in the above ground reactor are estimated to be about $91/1,000 gallons treated.