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IN SITU BIOREMEDIATION OF 1,2-DIBROMOETHANE (EDB) IN GROUNDWATER TO PART-PER-TRILLION CONCENTRATIONS USING COMETABOLISM
Hatzinger, P.B., J.F.Begley, D.R.Lippincott, A. Bodour, and R. Forbes.
Journal of Contaminant Hydrology 218:120-129(2018)
A groundwater recirculation system was installed at the FS-12 EDB plume on Joint Base Cape Cod (JBCC) to facilitate in situ treatment using ethane as a primary substrate to stimulate the aerobic, cometabolic biodegradation of EDB. Groundwater was taken from an existing extraction well; amended with ethane, oxygen, and inorganic nutrients; and then recharged into the aquifer upgradient of the extraction well, creating an in situ reactive zone. The concentrations of EDB, ethane, oxygen, and anions in groundwater were measured with time in a series of nested monitoring wells installed between the extraction and injection well. EDB concentrations in the six monitoring wells that were hydraulically well-connected to the pumping system declined from ~0.3 µg/L to <0.02 µg/L during the 4-month amendment period, meeting both the federal MCL and the more stringent Massachusetts MCL (0.02 µg/L). The data indicate that cometabolic treatment is a promising in situ technology for EDB and that low regulatory levels can be achieved with this biological approach.
Journal of Contaminant Hydrology 218:120-129(2018)
A groundwater recirculation system was installed at the FS-12 EDB plume on Joint Base Cape Cod (JBCC) to facilitate in situ treatment using ethane as a primary substrate to stimulate the aerobic, cometabolic biodegradation of EDB. Groundwater was taken from an existing extraction well; amended with ethane, oxygen, and inorganic nutrients; and then recharged into the aquifer upgradient of the extraction well, creating an in situ reactive zone. The concentrations of EDB, ethane, oxygen, and anions in groundwater were measured with time in a series of nested monitoring wells installed between the extraction and injection well. EDB concentrations in the six monitoring wells that were hydraulically well-connected to the pumping system declined from ~0.3 µg/L to <0.02 µg/L during the 4-month amendment period, meeting both the federal MCL and the more stringent Massachusetts MCL (0.02 µg/L). The data indicate that cometabolic treatment is a promising in situ technology for EDB and that low regulatory levels can be achieved with this biological approach.
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