Treatment of a former manufacturing site contaminated with a mixture of chlorinated solvent VOCs and petroleum VOCs in the vadose soil zones and shallow groundwater
Cullman, AL
PCE, TCE, vinyl chloride, cis-1,2-DCE, tetrachloroethene, xylenes, ethylbenzene
Initial assessment identified a 4,500 square foot source was contaminated from approximately 2 to 12 feet with a maximum of 180ppm of TCE, 6.6 ppm of DCE and lesser concentrations of vinyl chloride, tetrachloroethene, xylenes, ethylbenzene, and related VOCs. Due to the high clay content and other site factors, lime active Klozur® Persulfate was chosen to provide the most effective oxidation treatment.
Approximately 1,500 tons of impacted soils were treated in place. The results of confirmatory sampling indicate VOC concentrations were reduced to non-detect levels above and below the water table.
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.
