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PCE Treated at Active Dry Cleaner in Less Than 200 Days


icon-pdf PCE Treated at Active Dry Cleaner in Less Than 200 Days Download the PDF

Project Receives “No Further Action” Letter Following Combined Application of 3-D Microemulsion® and BDI® Plus

Project Highlights3dmerrs-300x208 PCE Treated at Active Dry Cleaner in Less Than 200 Days

  • Enhanced reductive dechlorination used to treat PCE contamination under an active dry cleaning facility
  • Total cVOC concentrations reduced by three orders of magnitude in less than 200 days
  • Total cVOC concentrations were below remediation goals

 

Project Summary

Groundwater below a Missouri dry cleaning facility was contaminated from a cleaning solvent spill, resulting in PCE concentrations >4,000 μg/L. An enhanced reductive dechlorination approach was developed that integrated biodegradation and bioaugmentation via application of a controlled-release electron donor and a microbial consortium of dechlorinating bacteria.

REGENESIS® Remediation Services (RRS) was contracted to co-apply 3-D Microemulsion® and Bio-Dechlor Inoculum® Plus to the affected groundwater. The products were applied to the affected groundwater underneath the building via direct-push injections.

Technology Description

3-D Microemulsion factory emulsified is an engineered electron donor material that offers a novel 3-stage electron donor release profile, pH neutral chemistry and is delivered on-site as a factory-emulsified product.

Bio-Dechlor INOCULUM Plus is an enriched 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.

Results

voc-remediation-case-study-results PCE Treated at Active Dry Cleaner in Less Than 200 Days
Following treatment, total cVOC were reduced by 99.9%. Concentrations were reduced by three orders of magnitude from a baseline concentration of >4,000 μg/L to <10 μg/L in less than 200 days.

Furthermore, monitoring data indicated complete dechlorination with no remaining daughter products above the remediation goals. As a result of the rapid and complete reduction of chlorinated solvents, the project received a “No Further Action” letter (NFA) through the Missouri Department of Natural Resources.