DNAPL to Non-Detect: 6 Orders of magnitude reduction of chlorinated solvents

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.

Remediation Strategy:

REGENESIS created a strategy comprising Enhanced Reductive Dechlorination (ERD) tailored to contaminant concentrations and local geology, across the entire impacted area. This strategy was coupled with an injectable Permeable Reactive Barrier (i-PRB) at the site boundaries. This in situ remediation approach proved to be successful, leading the site to closure after having reached stably very stringent concentrations (VC<0.5 μg/l; TCE<1.5 μg/l) and obtaining up to 6 orders of magnitude reduction in concentrations.

Suite of REGENESIS products applied for ERD: 3-D Microemulsion^®, HRC^®, HRC-X^®, HRC Primer^®.
Injectable Permeable Reactive Barrier : PlumeStop^®Liquid Activated Carbon^™ (CAC)

6m 30s reading time