DNAPL to Non-Detect: 6 Orders of Magnitude Reduction of Chlorinated Solvents

Case study highlights:

• Extensive chlorinated solvent contamination on a complex site was remediated using in situ treatment, including Enhanced Reductive Dechlorination (ERD) and a PlumeStop injectable Permeable Reactive Barrier (i-PRB).
• High-contamination areas saw significant reductions in chlorinated solvents, including potential Dense Non Aqueous Phase Liquid (DNAPL).
• A combination of sorption and ERD technologies achieved and maintained very low contaminant concentrations, meeting strict regulatory requirements and allowing for site closure.

Combined in situ sorption and biological degradation leads to site closure of large manufacturing site in Northern Italy. Chlorinated solvents were used for many years at a former manufacturing facility in Northern Italy. This resulted in contamination of the groundwater underlying a large proportion of this 60,000 m2 site. Groundwater concentrations of up to 155,000 μg/L TCE meant there was a suspected presence of Dense Non Aqueous Phase Liquid (DNAPL) on parts of the site. The contamination posed an unacceptable risk to both on- and off-site receptors and it was determined that active remediation was required on a large proportion of the site.