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.


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.