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Remediation of contaminated land using in-situ chemical oxidation and bioremediation

Client: Utilities company
Location: Portsmouth
Contract period: 6 weeks on site, 52 weeks validation testing

Two separate areas of the site had been identified by site investigation as presenting an unacceptable risk to human health and controlled waters.  Area 1, comprised of a 250m2 plume of chlorinated solvent contamination identified in the underlying chalk aquifer to a depth of 15.0m. Area 2 comprised of a 600m2 plume of petroleum hydrocarbon contamination within the made ground and perched groundwater.

Following a remediation options appraisal, the chlorinated solvent plume was treated anaerobically using Telluric’s patented bioremediation product, DCL Biosolv.  DCL Biosolv promotes the natural biodegradation of target contaminants by a process known as reductive dechlorination. The contaminants of concern were quickly reduced to below target concentrations and low levels were maintained during a 12 month monitoring and validation programme.

The petroleum hydrocarbon plume, mainly of diesel range organics, was treated to below target concentrations using modified Fenton’s reagent distributed across the area by a network of infiltration wells.  This area was also subject to a 12 month monitoring and validation programme to confirm compliance with requirements of the Regulators. 

telluric bullet Our solution

  • Development of appropriate remediation strategy
  • Operated in accordance with WML 30375
  • Anaerobic treatment of chlorinated solvent plume using DCL Biosolv
  • Chemical treatment of petroleum hydrocarbon plume by modified Fenton’s reagent
  • Installation of injection boreholes and injection infrastructure
  • Quarterly monitoring during 12 month validation period
  • Compilation of validation report

This case study demonstrates the benefits of using differing clean up techniques at a single site in order to meet remediation objectives in a timely and cost effctive manner.

A pdf version of this groundwater remediation case study is available here.