Specialty Earth Sciences, LLC was contracted to remediate a site that was impacted by residual coal tar by utilizing chemical oxidation methodologies.
Former manufacturing gas plant
Specialty Earth Sciences, LLC
Louisville, Kentucky
Benzene
Benzene from impacted soils had persisted between 320 μg/L and 264 μg/L. Injections were implemented utilizing a combination of Klozur® oxidant and proprietary catalyst solution, in conjunction with Subterranean Hydrocarbon Oxidation Circulation (SHOC) in-situ delivery techniques.
Benzene mass was reduced from pre-injection baseline levels of 276 μg/L to a sustained level of below 5 μg/L. Concentration levels currently remain below laboratory detection limits.
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.
EcoVac Services implemented SURFAC® and ISCO-EFR® at this site to remove SPH and reduce BTEX concentrations below the site’s CALs.
