Hazardous soils at two former locations of a manufacturing facility were treated by ex situ chemical oxidation, in order to meet the treatment standards for a nearby landfill as a non-hazardous waste.
Former manufacturing facility
Geomatrix Consultants, Inc.
Minnesota
DRO, PCP, Dioxins
Soils contained PCP concentrations greater than 120 milligrams per kilogram and were considered hazardous waste by Minnesota Pollution Control Agency. Chemical oxidants of hydrogen peroxide at one location and Klozur® at the other location were sprayed onto hazardous soils as the soils were returned to their original excavations, and then mixed with an excavator.
Post treatment confirmation sampling showed that PCP concentrations at both locations were below the treatment standard of 120 mg/kg, and the soils were disposed of at the nearby landfill.
The rail yard site in Nijmegen, Netherlands has been subject to contamination via leaks, spills, and filling losses of hydrocarbon fuels over the years. Despite previous remediation attempts there remained residual TPH contamination. Following a successful bench test, a full-scale remotely controlled injection unit was used for implementation of alkaline activated Klozur® persulfate. The reduction of the TPH levels achieved the remedial goals in both the bench and fieldwork.
The selected remedy, soil mixing using in situ chemical oxidation (ISCO) combined with in situ solidification and stabilization (ISS) was used to destroy contaminants while stabilizing soils
Site Closed Following a Single Application of Klozur® SP and Hydrated Lime.
The approach was designed to remove the lower molecular weight compounds, which are the more soluble and mobile fraction of the contamination, via chemical oxidation while cementing the remaining higher molecular weight fraction of the tar in place. The addition of cement was also intended to activate the Klozur SP by generating alkaline conditions, significantly improving the kinetics of the ISCO reactions.
Specialty Earth Sciences, LLC was contracted to remediate a site that was impacted by residual coal tar by utilizing chemical oxidation methodologies.
