--> ABSTRACT: In-situ Filtration Wells for Groundwater Treatment, by Kenneth Skinner, Richard M. Pawlowicz, and Paul Linley; #90906(2001)

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Kenneth Skinner1, Richard M Pawlowicz2, Paul Linley3

(1) Bechtel National Inc, Knoxville, TN
(2) Bechtel Jacobs Company LLC, Oak Ridge, TN
(3) IT Corporation, Knoxville, TN

ABSTRACT: In-situ Filtration Wells for Groundwater Treatment

In-situ treatment of contaminated groundwater has gained acceptance in recent years because of efficiency and lower cost, when compared to pump-and-treat systems. Permeable reactive barriers in the form of reactive walls and funnel-and-gate designs are the leading-edge technologies. These methods remove or transform contaminants in a passive manner without significantly disrupting groundwater flow. Most field trials and full-scale systems have primarily been used to treat chlorinated solvent plumes.

Current reactive wall and funnel-and-gate designs have several disadvantages, including:

bull.gif (830 bytes)The treatment of one type of contaminant,

bull.gif (830 bytes)The use of large volumes of treatment media,

bull.gif (830 bytes)High sampling costs, and

bull.gif (830 bytes)The reconstruction of the system at breakthrough.

In-situ filtration wells incorporate the advantages of permeable reactive barriers and address these disadvantages.

The in-situ filtration well is constructed of large diameter casing with inlet and outlet openings. The head difference between the upgradient and downgradient sides causes the contaminated groundwater to flow vertically up the casing. Interchangeable, retrievable filter canisters are placed inside the casing across the controlled flow path. The outlet on the downgradient side of the gate allows treated groundwater to pass into an infiltration gallery.

The design improvements include:

bull.gif (830 bytes)Initiating a highly controlled flow path,

bull.gif (830 bytes)Using canisters and media to treat several types of contaminants,

bull.gif (830 bytes)Reducing sampling, and

bull.gif (830 bytes)Easy replacement of spent filter canisters.

The in-situ filtration well system is most applicable to areas of shallow groundwater, with an underlying low permeability unit is present and with an aquifer of moderate to low permeability and a relatively low gradient.

AAPG Search and Discovery Article #90906©2001 AAPG Annual Convention, Denver, Colorado