Home Remediation Case Studies Case Study B3: Chemical Oxidation at a Former Chemical Works (Thornton) Chlorinated Solvents
Case Study B3: Chemical Oxidation at a Former Chemical Works (Thornton) Chlorinated Solvents

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Client: W2R

Consulting Engineer: RPS

Location: Thornton, Lancashire

Remediation Value: £2,000,000

Project: Intensive In-situ Chemical Oxidation of gross chlorobenzene (MCB) and dichlorobenzene (DCB) contamination using an innovative soil mixing delivery system. Very high concentrations of MCB and DCB were encountered throughout the subsurface, which comprised a complex mix of sands, silts and clays. Phase separated product was observed in a number of locations. In total five hot-spots were defined. The total treatment volume of these ‘hot-spots’ was 46,200 m3. To overcome the difficulties of geology and ensure sufficient mass of oxidants were injected Churngold designed a bespoke delivery system based on a CFA rig. High concentration oxidant slurry, comprising sodium persulphate (the oxidising agent) and lime products (activators), were injected at high pressure through the column of the CFA.

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