Envirotreat Technologies Ltd was commissioned by our client (on behalf of Persimmon Homes) to undertake treatment of contaminated soils impacted with predominantly hexavalent chromium [Cr VI] and cyanide pollutants on a site in Roade, Northamptonshire. The contamination was associated with the former use of a metal plating and anodising shop on the site – other metallic pollutants were also identified on the site – primarily copper, nickel and zinc (also derived from former plating activities). Envirotreat utilised an advanced stabilisation process to treat the contaminated soils / materials for compliance with the designated remediation target criteria to enable reuse on-site (primarily to protect controlled waters from the risk of pollution by Cr VI and cyanide – these pollutants posed a significant risk to groundwater due to their inherent high solubility, mobility, and toxicity). The advanced stabilisation process utilised ChromeSorb® (a proprietary form of E-Clay designed to chemically sorb and immobilise both cationic metallic species (trivalent chromium Cr3+, nickel Ni2+ etc) and anionic species (hexavalent chromium typically in the form of chromate CrO42- and cyanide species CN-). Over 4000m3 of contaminated soils / materials were treated utilising the advanced stabilisation process.
The Rolton Group were the environmental consultants for the project.
The photograph shows the ex-situ treatment of contaminated soils with the advanced stabilisation process (incorporating ChromeSorb).