Reactive Groundwater Circulation Well

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The Reactive Well Technology (GCW-R) significantly enhances the ability to combine a dynamic hydraulic flow system (GCW) with different reactive treatment areas under anaerobic conditions.

The specially designed remediation wells enable easy change to the reactive materials, such as controlled-release carbon plus zero-valent iron (ZVI) or other reduced metals, which is the subject of our EHC technology.

One major difference between the GCW-R technology and a typical permeable reactive barrier (PRB) is that the contaminants in groundwater are brought to the Groundwater Circulation Well (GCW) through the induced hydraulics (vertical flow) as opposed to having them migrate to the treatment area via natural groundwater flow.

This can result in accelerated treatment time. The integration of GCW + EHC yields highly anaerobic (-550 mV Eh) conditions in situ, and can accelerate the bioremediation of aquifers co-impacted by chlorinated solvents, heavy metals and/or perchlorate. Multiple in-well bioreactor configurations can be accommodated (packed bed, fluidized bed, and tangential-flow type) using a variety of biosupport matrices. The reactors can be located:

a) inside the well
b) in an annulus space between the well casing and a larger diameter outer casing
c) in a reaction vessel contained either above ground or below the ground surface
d) in drainage systems
e) through periferal injection points

Pumps are used to control flow rate and residence time through the bioreactor to provide the appropriate kinetic relationship between a particular reactor type, contaminant, and design configuration.

One recognized limitation of employing nanoscale ZVI technology in situ is associated with a general inability to introduce and distribute these particles into the environment in a way which maintains their desired reactivity. In most cases, the nanoscale ZVI particles quickly aggregate and precipitate, which greatly reduces their efficacy (i.e., they do not actually migrate with groundwater flow). This diminishes the value of applying expensive nanoscale reagents. Given the unique ability to engineer, monitor and control critical operating parameters of the GCW-R system, we can effectively introduce and distribute various remedial catalysts such as EHC and employ ZVI in the 1 to 5 micron range, which is considerably less expensive than nanoscale iron.

These various GCW technologies represent promising in situ treatment alternatives for soil and groundwater containing a wide range of contaminants, including perchlorate, pesticides and chlorinated solvents along with inorganic compounds (e.g. nitrate, sulfate) and/or heavy metals (mercury, arsenic and others).

Applied as multiple systems arranged in combination across or along the length of a groundwater pollution plume, IEG’s GCW delivers effective hydraulic control across interlocking spherical capture zones and transforms the aquifer in the capture zone into a reactive cell or virtual-Permeable Reactive Barrier (vPRB).

IEG’s GCW-R systems are specifically designed and uniquely configured to provide enhanced anaerobic or sequential anaerobic and aerobic reactions facilitating terminal destruction of persistent organics.

The technology can simultaneously provide in-situ treatment of soil (unsaturated zone) and the aquifer (saturated zone) without removing groundwater.

IEG's innovative GCW-R technology has been combined with Adventus Americas Inc.'s innovative remediation catalyst systems,EHCTM and Zero Valent Iron (ZVI).

Further Information fr
To discuss IEG Technologie GmbH | Soil and Groundwater Remediation Specialists - Reactive Groundwater Circulation Well or your individual in situ remediation requirements in detail, please click here to contact Dr. Eduard J. Alesi, Managing Director.

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