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Groundwater Circulation Wells

Alcohol flushing

Friday, 13 October 2006

The remediation of a chlorinated hydrocarbons (CHC) contaminated aquifer always contains a risk, because of the possibility of uncontrolled downwards mobilization of the CHC into deeper parts of the aquifer. This scenario would be even more harmful to the environment. The application of well known remediation techniques for CHC as e. g. pump-and-treat is not useful because of its extremely long duration caused by the low solubility of CHC.

Read more... [Alcohol flushing]
 

Emulsified oils

Wednesday, 10 September 2008
 

GCW-DNAPL

Monday, 25 September 2006

With a GCW it is possible to remove non-miscible liquids of higher density than water (DNAPL) from an aquifer. In order to remove dense non aqueous phase liquids (DNAPL) that have accumulated on the bottom of the aquifer, the GCW is operated in standard mode. The DNAPL is removed by means of a sensor-controlled, pneumatically-driven submersible pump. Thus it is made sure that just pure phase and no groundwater is extracted.

Read more... [GCW-DNAPL]
 

GCW-LNAPL

Thursday, 14 September 2006

A GCW-system is capable of accumulating and extracting LNAPL during groundwater treatment. The amount groundwater passing through the GCW system can be adjusted according to the type of contamination and the well construction. Recovery of LNAPL floating on top of the groundwater can be achieved by using a GCW-Reverse flow system. Pure LNAPL product can be pumped to an on-site collection tank.

Read more... [GCW-LNAPL]
 

GCW-Stacked - Multiple Circulation Cells in one aquifer

Monday, 19 February 2007

The sphere of influence of GCW (Groundwater Circulation Well) depends on the distance of the two screen sections or, in case of a fully penetrating well, on the aquifer thickness. The larger the circulation cell is, the larger the travel time is for the circulation. For thick aquifers it may be beneficial to install several circulation cells, one upon another. This produces smaller circulation cells and shortens circulation flow time.

Read more... [GCW-Stacked - Multiple Circulation Cells in one aquifer]
 

Groundwater Circulation Well

Wednesday, 11 November 2009
 

The IEG Groundwater Circualtion Well (IEG GCW) process is an in-situ system for the remediation of contaminated aquifers, especially those contaminated with volatile and semi-volatile hydrocarbons, using a combination of chemical, physical and biological processes. An IEG GCW process unit consists of a specially-adapted groundwater well, at least one submersible pump, a negative pressure stripping reactor located in a sub-surface vault, an above-ground mounted blower, and a waste air decontamination system (for example disposable filters or regenerative activated carbon filters).

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In-situ chemical oxidation

Thursday, 14 September 2006

The chemicals (permanganates, peroxides etc.) required for the execution of ISCO are prepared above ground and fed into the groundwater by injecting it through a GCW. The required quantities should be determined by means of laboratory tests beforehand. To mix in hydrogen peroxide in moderate concentrations will stimulate the aerobic biological degradation. The radial-symmetric circulation fields permit more homogenous and more effective dispersion of chemicals in the subsoil than other hydraulic processing techniques.

Read more... [In-situ chemical oxidation]
 

In-Situ Well Stripping Process

Thursday, 14 September 2006

Possible Areas of Application: The UVB is an in-situ system for the remediation of contaminated aquifers, especially those contaminated with volatile and semi-volatile hydrocarbons or heavy metals, using a combination of chemical, physical and biological processes.

Primary Components: An IEG UVB process unit consists of a specially-adapted groundwater well, a negative pressure stripping reactor, an above-ground blower, and a waste air decontamination system (for example disposable filters or regenerative activated carbon filters).

Read more... [In-Situ Well Stripping Process]
 

Macro Porous Polymer Extraction

Thursday, 14 September 2006

The GCW-MPPE process is an in situ system for the remediation of groundwater contaminated with dissolved or dispersed aromatic, aliphatic, poly aromatic and halogenated hydrocarbons using a combination of a hydraulic controlled flushing/extraction system with a high efficient physical purification system based on macro porous polymer extraction.

Read more... [Macro Porous Polymer Extraction]
 

Microbiological enhanced Groundwater Circulation Well (mGCW)

Thursday, 14 September 2006

Due to the minimal environmental impact and low cost of implementation, biological remediation technologies have become increasingly popular during the last few years. In an ideal case, depending on the type of contaminants on the site, naturally occurring microorganisms degrade organic compounds to carbon dioxide and water. The rate of biodegradation is determined by the existing chemical and physical conditions. The goal of in-situ biological remediation technologies which IEG implements is to optimise the existing degradation potential.
Read more... [Microbiological enhanced Groundwater Circulation Well (mGCW)]
 

Multi-Functional Well

Monday, 25 September 2006

The Multi-Functional Well (IEG MFW) has been implemented for the remediation of subsurface contamination caused by hydrocarbon spills. Four different remediation processes can be operated within the same well. At optimal efficiency of each remediation process, successive treatment of the capillary fringes, the vadose zone, and the aquifer can be accomplished. Each treatment process requires only simple modifications of the well configuration. Removal of the contaminants is done primarily through in situ air stripping.

Read more... [Multi-Functional Well]
 

Proven In-situ Remediation Systems

Wednesday, 04 November 2009
 

Reactive Groundwater Circulation Well

Thursday, 14 September 2006

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.

Read more... [Reactive Groundwater Circulation Well]
 

Soil Circular Flushing Well

Tuesday, 12 September 2006

In the unsaturated zone, bioremediation is critically affected by the soil moisture content. For most natural biological degradation processes, the optimal water content is in range between 50% - 80%. With the Soil Circular Flushing Wella vertical multi-phase flow increases the saturation of water in the unsaturated zone. The remaining volatile hydrocarbons are either removed by in-situ stripping in the well, adsorbed on an optional activated carbon bed on top of the outer casing, or biodegraded in the well and unsaturated zone.

Read more... [Soil Circular Flushing Well]
 

Virtual-Permeable Reactive Barrier

Monday, 25 September 2006

IEG-vPRB In-situ Virtual Permeable Reactive Barrier with Overlapped Circulation Cells.
When a GCW is situated within the body of a groundwater contamination plume, this creates effective hydraulic control across a large diameter spherical capture zone within the aquifer. The polluted upstream groundwater is systematically captured by the GCW and treated in the well and within the aquifer.

Read more... [Virtual-Permeable Reactive Barrier]
 
Further Information
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To discuss IEG Technologie GmbH | Soil and Groundwater Remediation Specialists - Groundwater Circulation Wells or your individual in situ remediation requirements in detail, please click here to contact Dr. Eduard J. Alesi, Managing Director.

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