Our on-site soil treatment technology has been constantly developed over the last 30 years.
In its simplest form it involves mixing a binding reagent or reagents into the contaminated media or waste. The reagent formulations are determined after reviewing the analytical data of the contaminated waste stream to be treated. The chemical elements, concentration, and combination of contaminants are reviewed in conjunction with our extensive database along with site specific clean-up criteria. This data base compares the site information against previous of formulations successfully used on previous projects.
Typically 3 or 4 potential formulations are then used in laboratory testing where we apply the reagent mixes to actual waste samples. The treated samples are then sent to an independent UKAS accredited test laboratory to assess performance against the site specific target criteria for the project. The optimum reagent mix is then proposed for use on site.
The treatment process protects human health and the environment by eliminating, modifying, or immobilizing contaminants within the treated material, and therefore prevents migration of the contaminants to human, animal, plant receptors and controlled waters.
Five different types of reagent are generally used in our formulations – these are:
- Adsorptive – To control Moisture content
- Pozolonic - To encapsulate and modify/improve physical characteristics
- Modifiers - To convert Haz CoC’s to non-haz compounds
- REDOX - To destroy Haz CoC’s
- Buffers - To control pH
Our treatments are used for wastes that have both inorganic and organic hazardous constituents.
The treatments are targeted to optimise results based on previous performance and research that has gone into the development of the reagent formulations adapted to the needs of each particular site and soil. Initially the process was applied to inorganic metals impacted soils but has developed over time to treat all forms of contaminants and hazardous wastes.
To date we successfully recycled soils contaminated with combinations of hydrocarbons, heavy metals, VOCs, PAHs and even cyanide based gas works waste like ‘Blue Billy’, as well as on-site recycling, recovery and reuse of complex, geo-technically poor soils.
Most remediation techniques have only a specific, and sometimes limited, effect in complex contamination conditions. Our process, however, is the first remediation approach that treats multiple contaminants, in all types of soil, in a single fast treatment. After just four days, soils previously contaminated with leaching metals, short chain hydrocarbons, PAH, BTEX and Cyanides, are ready for re-deposition or reuse on site.
Early stage treatability trials for each project, with independent laboratory analysis, are carried out in accordance with Environment Agency standards, such as Guidance on the use of ‘Stabilisation/Solidification for the Treatment of Contaminated Soils’.
Soil recovery and recycling not only removes the costs associated with transportation, landfill disposal and landfill tax, but also reduces programme duration significantly.