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Monday, 25 September 2017
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Technologies

Coaxial Groundwater Circulation

Tuesday, 12 September 2006

IEG Coaxial Groundwater Circulation Sparging (IEG CGC-Sparge) is a combination technique which is used for the effective remediation of shallow aquifers and perched groundwaters at depths of up to 3 to 7 metres which are contaminated with a range of volatile organic substances, including petroleum hydrocarbons and solvents. 

Read more... [Coaxial Groundwater Circulation]
 

Proven In-situ Remediation Systems

Wednesday, 04 November 2009
 

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]
 

Modular Groundwater Treatment

Tuesday, 11 September 2007
Image here:Modual Treatment - K
Modual Treatment - K

For strippable groundwater compounds.
Image here:Modular Treatment - KS
Modular Treatment - KS

For strippable groundwater compounds and groundwater with high iron and manganese contents.

Image here:Modular Treatment - KSW
Modular Treatment - KSW

For strippable and non strippable groundwater compounds.

Image here:Modular Treatment - KSWR
Modular Treatment - KSWR

For strippable and non strippable groundwater compounds and groundwater with a high iron content.

Read more... [Modular Groundwater Treatment]
 

Thermally enhanced soil air circulation (TESAC)

Wednesday, 02 April 2008
Soil air circular flow is employed to remediate soils polluted with volatile contaminants (e.g. CHC, BTEX, jet fuels), some semi-volatile contaminants and/or biodegradable substances. Due to the application of low negative pressure, TESAC systems can be implemented in soil, where the horizontally induced flow bypasses contaminants trapped in low-permeability layers.
Read more... [Thermally enhanced soil air circulation (TESAC)]
 

Vacuum Vapour Extraction

Friday, 15 September 2006

The conventional technique of Soil Vapour Extraction has proven to be a practical and inexpensive method for the removal of volatile and semi-volatile hydrocarbons from the unsaturated zone. Soil Vapour Extraction is conventionally carried out using small-sized boreholes which extend to just under the groundwater table and are outfitted with screens of diameters up to 50 mm. Depending on the size of the equipment and the properties of the soil, blowers are usually operated at pressure differences of 100 to 300 millibars. This high negative pressure draws perched or capillary water into the venting system.

Read more... [Vacuum Vapour Extraction]
 

IEG Desorption Stripping Units (DSU)

Friday, 10 August 2007

IEG-Desorption-Stripping-Units (DSU) are used to remove volatile contaminants from groundwater. According to the required effluent concentration the desorption units (or packed stripping towers) have to be either one-stage or multiple-stage.

Read more... [IEG Desorption Stripping Units (DSU)]
 

Soil Air Circulation - Bioventing

Tuesday, 12 September 2006

Directed Soil Air Circulation systems (SAC) are employed for the remediation by Bioventing of soil contaminated with volatile hydrocarbons by enhancing the IEG Vacuum Vapor Extraction (IEG VVE) technique. In addition, they can be used to inject gas into the soil for the stimulation of biological or chemical degradation.

Read more... [Soil Air Circulation - Bioventing]
 

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]
 

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)]
 

Soil Air Circulation - Vacuum Vapour Extraction

Tuesday, 12 September 2006

Directed Soil Air Circulation systems (SAC) are employed for the remediation of soils contaminated with volatile hydrocarbons by enhancing the IEG Vacuum Vapor Extraction (IEG-VVE) technique. In addition, they can be used to inject gas into the soil for the stimulation of biological or chemical degradation.

Read more... [Soil Air Circulation - Vacuum Vapour Extraction]
 

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).

Read more... [Groundwater Circulation Well]
 

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]
 

Catalytic Air Treatment

Thursday, 15 February 2007
Recuperative Catalytic Air Treatment Units (CatOx)
The polluted process air is heated either by a gas or an electrical heater to the necessary reaction temperature and then guided over the catalyst bed.
In the reactor bed the pollutants are decomposed to carbon dioxide and water. The heat from the reactor is recovered by a recuperative heat exchanger and used to pre-heat the process air.
Read more... [Catalytic Air Treatment]
 

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
 

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]
 

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]
 

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]
 

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]
 

Activated Carbon - Vapour

Thursday, 14 September 2006
IEG's specially designed Granular Activated Carbon recovery systems (IEG GAC-Sorb) provide superior adsorption capacity due to an innovative system for the distribution of volatile organic compounds (VOCs) from contaminated off gas. Highly efficient in design and effective in operation, the largest of the systems, the 3000 litre, is capable of receiving and treating up to a maximum of 2300 m3/h of highly contaminated air, with a typical loading of up to 350 kg.
Read more... [Activated Carbon - Vapour]
 

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]
 

KS 1000 Compact Vacuum Stripper

Thursday, 14 September 2006

IEG's Compact Vacuum Stripper (IEG CVS 1000) is an innovative system for the removal of volatile organic compounds (VOCs) from contaminated groundwater. Highly efficient in its design and effective in operation, the system is capable of receiving and treating up to a maximum of 15 m /h of highly contaminated water, with a VOC removal efficiency of up to 99.5%.

Read more... [KS 1000 Compact Vacuum Stripper]
 

Multi-Level Sampling Well

Thursday, 14 September 2006

When a number of IEG-MLSW systems are used at a site, they allow a very detailed three-dimensional soil and groundwater contamination profile to be developed, at a reasonable cost, since fewer boreholes are required, which itself reduces well purging and sampling time on site, at a much reduced cost. The patented modular system can be customised for the needs of each project, depending on the findings of a geoenvironmental investigation, or alternatively based on predetermined depths of interest. This IEG MLSW can be removed from the monitoring well.

Read more... [Multi-Level Sampling Well]
 

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]
 

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]
 

Vacuum Liquid Recovery

Thursday, 14 September 2006

Vacuum-Enhanced Liquid Recovery (IEG VLR) process is an innovative technology underpinned by a detailed knowledge of how hydrocarbons actually behave in the subsurface. Using IEG VLR maximum recovery of free-phase product floating on top of the groundwater can be achieved quickly and cost effectively using a specially adapted well screened above the groundwater surface combined with one of several possible hydrocarbon recovery systems.

Read more... [Vacuum Liquid Recovery]
 
Further Information
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To discuss IEG Technologie GmbH | Soil and Groundwater Remediation Specialists - Technologies or your individual in situ remediation requirements in detail, please click here to contact Dr. Eduard J. Alesi, Managing Director.

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