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Enhanced Reductive Dechlorination with Bioaugmentation Treats Source Area, Stops Plume Migration

Combined Remedy Source Treatment Applied at Florida Dry Cleaner

Project Highlights

  • Aggressive source treatment to deplete the high-concentration PCE mass
  • Plume treatment with a permeable reactive barrier to cut off the plume
  • Low-impact direct-push injections in both areas
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Project Summary

A former dry cleaner in an urban setting in central Florida was contaminated with a PCE plume that extended nearly 1,000 feet downgradient from the source. An extensive treatability test involving multiple emulsified vegetable oils and other electron donor technologies indicated that 3-D Microemulsion® would perform best at the site. An enhanced anaerobic bioremediation treatment was implemented in two areas – the source area near the dry cleaner and an area approximately 500 feet downgradient. A total of 13,900 gallons of 3-D Microemulsion was injected into 30 direct push points in the two areas. In addition, 97 liters of Bio-Dechlor INOCULUM Plus (BDI® Plus) bioaugmentation culture was injected to accelerate treatment results.

Remediation Approach

The injections were performed near the former dry cleaner to deplete the source mass and expedite a transition into natural attenuation monitoring. A plume treatment was implemented as a permeable reactive barrier approximately 500 feet downgradient to help mitigate the risk of additional downgradient migration. Injections were completed using direct-push technology.

Technology Description

3-D Microemulsion is an engineered electron donor technology that offers a novel 3-stage electron donor release profile pH-neutral chemistry, and unique subsurface distribution properties.

Bio-Dechlor INOCULUM Plus is a natural microbial consortium containing species of Dehalococcoides sp. (DHC). This microbial consortium has since been enriched to increase its ability to rapidly dechlorinate contaminants during in situ bioremediation processes.