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In Situ Groundwater Treatment of Pentachlorophenol (PCP), Sweden


Chemical oxidation and enhanced reductive dechlorination

Summary

Pentachlorophenol (PCP) was used to prevent mould in sawed timber at a saw mill in Hjortsberga, central Sweden. Over time, the use of PCP resulted in the groundwater within the saturated unconsolidated aquifer under the site becoming contaminated. It was determined that remedial measures should be taken.

icon-pdf In Situ Groundwater Treatment of Pentachlorophenol (PCP), SwedenDownload the pdf

19_RGS90_Sawmill-Site In Situ Groundwater Treatment of Pentachlorophenol (PCP), SwedenWith RGS 90 (photography by Martin Olson, RGS 90)

Treatment

The contamination was concentrated in two hotspots of around 10,000 μg/L PCP and a much larger plume of around 1,000 μg/L or less. Two injection rounds of RegenOx were applied in the hotspot areas in order to provide rapid mass reduction of the contamination. This will be followed by a single application of 3D Microemulsion in order to enhance the anaerobic biological degradation of the contamination in order to reach low target concentrations.

What’s Special?

  • Remediation of this highly toxic contaminant was completed without requiring any soil or groundwater to be brought to the surface, ensuring the treatment was completed safely.
  • The in situ nature of the remediation also kept site disturbance to a minimum.
19_PS_Reg_1407_OlC46796_PCP_ROx_3DMe_SE In Situ Groundwater Treatment of Pentachlorophenol (PCP), Sweden