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IN SITU DESTRUCTION OF CHLORINATED HYDROCARBON COMPOUNDS IN GROUNDWATER USING CATALYTIC REDUCTIVE REDUCTIVE DEHALOGENATION IN A REACTIVE WELL: TESTING AND OPERATIONAL EXPERIENCES. (R825421)
Citation:
McNab, J. R., R. Ruiz, AND M. Reinhard. IN SITU DESTRUCTION OF CHLORINATED HYDROCARBON COMPOUNDS IN GROUNDWATER USING CATALYTIC REDUCTIVE REDUCTIVE DEHALOGENATION IN A REACTIVE WELL: TESTING AND OPERATIONAL EXPERIENCES. (R825421). ENVIRONMENTAL SCIENCE & TECHNOLOGY. American Chemical Society, Washington, DC, 34(1):149-153, (2000).
Description:
A groundwater treatment technology based on catalytic reductive
dehalogenation has been developed to efficiently destroy chlorinated
hydrocarbons in situ using a reactive well approach. The treatment process
utilizes dissolved H2 as an electron donor, in the presence of a
commercial palladium-on-alumina catalyst, to rapidly reduce common chlorinated
aliphatics such as trichloroethylene and tetrachloroethylene into nonchlorinated
hydrocarbons such as ethane. Rapid reaction rates permit the deployment of a
treatment unit within a dual-screened well bore, allowing contaminated
groundwater to be drawn from one water-bearing zone, treated within the well
bore, and discharged to an adjacent zone with only one pass through the system.
A demonstration groundwater treatment system based on this concept was evaluated
in a chlorinated hydrocarbon contaminated aquifer at a major Superfund site. The
system rapidly destroyed a variety of common contaminants such as TCE and PCE
and maintained its performance for a test period of 1 year. Operation of the
treatment system was optimized to maintain catalyst activity and to prevent
formation of intermediate compounds.