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Barrier for blocking movement of contaminants within an aggregate particulate substrate
| Details |
Inventors: Raimondi, Pietro; Acheson, Willard P.; Overbey, Jr., William K.;
Assignee: K & M Engineering & Consulting Corp. (Washington, DC); BDM Federal, Inc. (Morgantown, WV)
Primary Examiner: Taylor; Dennis L.
Assistant Examiner:
Attorney, Agent or Firm: Pillsbury Madison & Sutro LLP
A system and method of preventing groundwater contamination by a plume of liquid born toxic contaminants that includes establishing a dry barrier between a plume of liquid contaminants and the water table to immobilize the toxic contaminants. The dry barrier is formed by transporting dry gas into the barrier region, such as with injector wells, and then removing it and any moisture it has absorbed, such as with extraction wells to create a layer or bowl shaped structure that is so dry that liquid borne contaminants cannot pass therethrough. By maintaining the barrier, the contaminants form an immobile crust above the barrier which assists in prevention of liquid transport of contaminants into the groundwater. The system is particularly effective when radioactive contaminants are involved because the contaminants can remain fixed and undisturbed underground. |
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DETAILED DESCRIPTION The present invention creates a barrier to the liquid transport of contaminants through a substrate by circulating a drying carrier through the substrate.
Preferably the drying carrier will be dry air and the resultant barrier is referred to as a circulating air barrier.
In the circulating air barrier method, dry air is injected from an array of either vertical or horizontal wells.
The air sweeps through the porous substrate to production wells, vaporizing water and any volatile organic compounds in the process.
An initial application for the invention is contemplated at a site in Hanford, Wash.
Thus, enabling discussions may reference specifics to this site but the invention is not limited in its application to any particular site.
It has been calculated that with readily achievable injection flow rates, half of the water currently present could be swept out in one or two years.
The interval targeted for drying is a volume below the waste storage tank farm about 500 by 500 square feet and about 50 feet thick.
It starts just under any pre-existing plume, about 150 feet below the surface, and down to about 200 feet, which is about 50 feet above the water table at the Hanford site.
Existing vertical wells may be used, deepened and/or new wells drilled using cable tool, sonic, or dual wall percussion methods.
Wells would be drilled or deepened to a depth of 200 feet.
The positioning of the vertical wells can be extremely accurate.
Each well would be equipped with port collars that can be mechanically opened or closed.
Each well could therefore be used to either inject air or produce vapor.
Moreover, the injection and/or production could be varied by the depth needed to improve process efficiency.
Horizontal wells are more efficient injectors or producers than vertical wells.
Fewer horizontal wells would be required than that required for vertical well operations.
Each horizontal well would be equipped with mechanical port collars to provide a large number of injection and production points and thereby improve production from the fifty foot interval that is the target for the conceptual design
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