U.S. EPA Superfund Innovative Technology Evaluation (SITE) Program
Two-Zone, Plume Interception, In Situ Treatment Strategy
ABB Environmental Services, Inc.

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Two-Zone, Plume Interception, In Situ Treatment Strategy, ABB Environmental Services, Inc. (64KB) 

Abstract

The two-zone, plume interception strategy is designed to biodegrade chlorinated and non-chlorinated organic compounds in saturated soils and groundwater using a sequence of anaerobic and aerobic conditions. Anaerobic and aerobic conditions are produced in two distinct, hydraulically-controlled saturated soil zones. Groundwater passes through each zone as it is recirculated through the treatment area. The anaerobic zone is designed to partially dechlorinate highly chlorinated solvents such as tetrachloroethene (PCE), trichloroethene (TCE), and 1,1,1- trichloroethane with natural biological processes. The aerobic zone is designed to biologically oxidize the partially dechlorinated products from the anaerobic zone, as well as other compounds not susceptible to anaerobic degradation. Anaerobic conditions are produced by introducing a carbon source, such as glucose, and nutrients (nitrogen and phosphorus). Aerobic conditions are produced by adding oxygen along with nutrients, and possibly a carbon source such as methane. Specially adapted bacterial cultures can be added if natural populations do not provide the desired results. Following bench-scale testing, a pilot-scale demonstration was installed at an industrial facility in Massachusetts. Testing was begun in September 1996.

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Posted October 1, 1999

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