IEG Technologie GmbH is a specialist company providing high-quality solutions and turn-key delivery for soil and groundwater remediation using primarily innovative in-situ technologies. We pride ourselves in our ability to solve the problems of our customers in a cost-effective, time saving and sustainable way to eliminate liabilities and risk, adding value in the process. Our remediation technology systems are offered on a guaranteed fixed capital payment basis, irrespective of remediation duration, or alternatively on flexible terms to meet the requirements of a client's budget.
Our typical project approach after reading all available assessment reports by experienced senior staff, is to achieve an in-situ remediation concept based on optimized processes for each site. For larger sites a field pilot test is designed to evaluate the sphere of influence for the installed system in the impacted media. The data generated during the pilot program allows IEG to design a full-scale remediation program that will be the most cost effective and time saving in remediating the site. Our range of services include design, manufacturing, assembly, start-up, maintenance, service and operation.
The philosophy behind IEG's low-impact technologies fits exactly with the low environmental impact ethos of modern 'sustainability requirements' and IEG's technology specializes in low energy, low noise and minimum intrusion. We treat contamination in-situ, generate minimum wastes for disposal, have no water abstraction for treatment and disposal elsewhere, and have minimal above ground treatment facilities.
IEG systems have been proven as a effective treatment tool for the remediation of groundwater contaminated with aliphatic and chlorinated hydrocarbons (CHC), benzene, toluene, ethyl benzene, xylene (BTEX), styrene, diesel, kerosene, jet fuel, fuel oils, PAHs, phthalate, pesticides etc. GCW also be combined with Metal Remediation Compounds for immobilization in the remediation well for heavy metals treatment. For effective free product recovery IEG combines GCW with simultaneous vacuum-enhanced automated LNAPL or DNAPL recovery systems. Also the integration of ISCO (in-situ chemical oxidation), ISCR (in-situ chemical reduction with micro scale iron) and alcohol or surfactants flushing can be applied.
In 1985, IEG became a pioneer in the field by being at the forefront of the development of revolutionary in-situ groundwater circulation technologies. The company boasts numerous international patents, which demonstrate the high standard and innovation of the technologies. Extensive hydraulic research has been done developing the scientific hydraulic calculations for the implementation of groundwater circulation systems in the field. In the United States of America, the GCW technologies have been evaluated and approved under the US Environmental Protection Agency's Superfund Innovative Technology Evaluation (SITE) program, and by many other Government authorities.
Over 150 scientific and technical references in the literature are available. IEG has worked under different research programs in Germany since 1990. Over a time period of more then 10 years laboratory experiments and field pilot tests have been conducted together with the Institute of Hydromechanics, University Karlsruhe. At VEGAS facilities University Stuttgart, several large scale laboratory experiments for verification of GCW remediation efficiency are performed. The technology is very well understood and fully accepted by the authorities worldwide.
The staff has many years of broad hands-on experience applying IEG's innovative remediation technology. Since 1990 alone, IEG systems have been used to successfully complete over 300 remediation projects across Europe, the United States of America, Israel and Taiwan.
Proven In-situ Remediation Systems
The conventional approach for remediating contaminated groundwater has been to extract the contaminated water, treat it above ground, and reinject or discharge the clean water ('pump-and-treat').
It is becoming increasingly apparent that pump-and-treat technologies require considerable investment over extended periods of time, and that they have been proven inadequate in many cases. Often, they do not actually clean up the source of groundwater contamination. In situ treatment technologies for contaminated groundwater are now considered to be fundamentally more efficient, cost effective and are significantly more sustainable alternatives to pump-and-treat.
GCWs can be used in conjunction with other in situ technologies to treat halogenated VOCs, semi-VOCs (SVOCs), pesticides, and petroleum products and their constituents such as benzene, toluene, ethyl benzene, and xylene (BTEX). They have been applied to a wide range of soil types, from fine silty clay to coarse sandy gravel. With at least two screen sections, GCWs are universally applicable remediation tools.
They can be employed in several configurations, such as in well stripping (IWS), bioaugmentation, enhanced natural attenuation adding nutrients and/or electron acceptors for stimulating bioremediation processes, bioventing, soil vapour extraction, reactive nanoparticle dehalogenation, in situ denitrification and chemical oxidation (ISCO) or reduction (ISCR). They may also be combined with a LNAPL /DNAPL recovery system in the aquifer.
Different GCW configuration and/or composition allows wide and versatile solutions, e.g. the vPRB (in situ Virtual Permeable Reactive Barrier) where several vertical circulation wells are arranged in one line perpendicular to the natural groundwater flow to obtain a curtain of overlapped circulation cells; such configuration could be promising to treat huge plumes generated by contaminated mega-sites.
Groundwater Circulation Well systems are designed to create in situ vertical groundwater circulation cells by drawing groundwater from an aquifer through one screen section of a double-screened well, and discharging it through the second screen section.The pressure gradient between two hydraulically separated screen sections in the well induces a circulation flow in the aquifer. Groundwater circulation commonly occurs from the top of the formation to the bottom (herein termed 'standard flow'). Under standard flow conditions, groundwater is pumped upward inside the remediation well as it enters a lower screen section and exits via an upper screen section. The groundwater moves through the treatment zone both horizontally and vertically before entering the influent screen.
In a reverse circulation mode, the flow of groundwater within the GCWwell is downward via the aid of an in-well groundwater pump (i.e., water flows from the bottom of the aquifer formation in a torroidal upward pattern). In the reverse circulation mode, water in the lower half of the aquifer moves away from the well while water in the upper half of the aquifer moves towards the well.