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RECIRCULATING WELLS: GROUND WATER REMEDIATION AND PROTECTION OF SURFACE WATER RESOURCES
When drinking-water wells in Falmouth, MA, were found to be contaminated in 1978 by fuel-related VOCs, chlorinated solvents, and ethylene dibromide from the Massachusetts Military Reservation, a remedial scheme was designed, which called for withdrawal, treatment, and reinjection of 27 million g/d....
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Published in: | Journal of the American Water Resources Association 2000-02, Vol.36 (1), p.191-201 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Online Access: | Get full text |
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Summary: | When drinking-water wells in Falmouth, MA, were found to be contaminated in 1978 by fuel-related VOCs, chlorinated solvents, and ethylene dibromide from the Massachusetts Military Reservation, a remedial scheme was designed, which called for withdrawal, treatment, and reinjection of 27 million g/d. The plan was found eventually to be environmentally unacceptable and was replaced by a phased approach that included pilot testing of alternative technologies. One of these was the recirculating well, which is a self-contained groundwater extraction, treatment, and reinjection system that employs in-well air stripping to remove VOCs. Results are presented from a pilot test of the NoVOCs super( registered ) recirculating well technology that was conducted between December 1996 and August 1997. Contaminant vapors were treated with granular activated carbon and returned to the well as reinjected air. Time series data indicated a significant reduction in trichloroethylene concentrations within the treatment zone during the pilot test. A comparison of the influent and effluent concentrations in the wells indicated that the average in-well contaminant removal efficiency was 91%. The conceptual design of a full-scale system is outlined, along with the protected capital and operating costs. The projections suggest that the recirculating wells would be much less expensive and environmentally disruptive than a comparable pump, treat, and reinjection system. |
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ISSN: | 1093-474X 1752-1688 |
DOI: | 10.1111/j.1752-1688.2000.tb04259.x |