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Envirotreat Technologies Ltd
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West Midlands.

Tel: 01384 288876


Permeable Reactive Barriers


The Envirotreat® Reactive Barrier System incorporates the use of modified pillared E-Clay technology. The Patented E-Clay technology is designed to adsorb and chemically immobilise pollutants of concern within contaminated groundwater.

In its simplest form, the Envirotreat Reactive Barrier consists of a barrier placed to intercept the flow of contaminated groundwater flow. The barrier is unique in that it consists of the reactive material (pillered modified clayswhich are porous providing a permeable medium) mixed in-situ with the soils present. As the groundwater passes through the treatment barrier, the contaminants react with the media and are removed resulting in compliant groundwater.

The in-situ reactive barrier technology is recognised as the most effective form of groundwater treatment available. We have successfully treated groundwater contaminated by a wide range of chemicals including the most commonly found problem contaminants in the UK, i.e. hydrocarbons, inorganic pollutants such as ammonium and metallic species (both cationic and anionic).

One of the unique attributes of the technology is its flexibility for application to a range of simple and/or complex contamination issues.

The barrier can be used as a standalone remediation technique of as integral component of a larger remediation strategy.

Key Benefits

The key advantages of this technology are:-

  • The barrier can be designed to effectively treat a wide range of inorganic / organic contaminants;
  • Following installation, the barrier scheme has minimal impact on the site development and does not require above ground infrastructure (as required fro pump and treat systems for example);
  • Once installed the barrier requires no maintenance, the barrier can be designed to last the lifetime of the contamination source with sufficient capacity to effectively treat all identified contamination;
  • The barrier is designed to intercept the natural flow of groundwater and is designed to have minimal impact on the overall groundwater regime;
  • The implementation is relatively straightforward, there is no need to excavate and therefore dispose of potentially contaminated material;
  • Additions of modified clays are small, less than 4% and mixed with the original soils this results in minimal effects of permeability;

Barrier design.

Using available site investigation information pertaining to groundwater and contamination, Envirotreat are able to devise a barrier design to address the remediation requirements for the site.


The above scheme relates to the actual barrier installation at Barking Riverside

  1. The in-situ E-Clay stabilisation of several hydrocarbon “hotpots” close to the barrier installation
  2. Removal and ex-situ E-clay stabilisation of identified areas of “spent oxide” waste
  3. Installation of soil mixed E-Clay reactive barrier along the southern and eastern site boundaries
  4. Installation of low permeability barrier along western site boundary
  5. Position of post remediation monitoring borholes



E-Clay slurry is introduced into the ground in the area of contamination by means of piling (auger) equipment.

As the auger mixes the soils, treatment slurry is injected through the auger drilling head injection ports and mixed with soil undergoing treatment.

Treatment is achieved by the formation of overlapping piles within the treatment area, as shown below.


Other installation techniques have sucesssfully been utilised to install barriers, including mass soil mixing, excavation and ex-situ mixing,double head soil mixing and triple augers to name a few.

Click here to view our Envirotreat - Insitu Soil Mixing of Gas Holder Video