Americas
Europe
Français
Deutsch
Italiano
Español
Pilot Projects at Two UK Airports Demonstrate Successful In-Situ PFAS Remediation
Download the Case Study
Case study highlights:
- Successful colloidal activated carbon treatments have lead to regulatory permission for full-scale remedial projects
- Design Verification Testing (DVT) conducted to confirm the flux of PFAS
- PlumeStop PRBs targeted contaminant flux zones, converting the aquifer into a purifying activated carbon filter
- Groundwater monitoring at both sites showed that PFOS and PFOA were reduced to at, or close to detection limits
This case study reviews two airport sites in the United Kingdom where the groundwater was contaminated with PFAS that had originated from the use of Aqueous Film Forming Foams (AFFF). An in situ approach using colloidal activated carbon permeable reactive barriers (PRB) combined with successful pilot study results allowed for regulatory permission for full-scale PlumeStop PRB installations on both sites. At both sites, PlumeStop barriers were installed perpendicular to groundwater flow downgradient of the fire training areas. Each PlumeStop PRB was installed close to existing groundwater monitoring wells with historical data. This converts the contaminant flux zones in the treatment area into subsurface filters, which adsorb incoming contamination and stop offsite migration. This prevents risk to downgradient receptors, removes offsite liability from the site owner and allows Enhanced Natural Attenuation (ENA) of the downgradient PFAS plume.
Martha’s Vineyard Airport Successfully Treated Using PlumeStop to Eliminate PFAS Risk
Download the Case Study
Case study highlights:
- Cost-effective in situ approach addresses PFAS risk with no greenhouse gases or hazardous waste
- Contaminant flux measurements were obtained using FluxTracer, informing the PlumeStop dose required in the barrier to achieve the treatment objective
- Early performance data show PFAS mass flux eliminated downgradient of PlumeStop barrier, as monitoring continues
This case study reviews a site at Martha’s Vineyard Airport where a PlumeStop barrier was used to treat PFAS. In less than four months, PlumeStop has eliminated PFAS mass flux immediately downgradient of the barrier and significantly reduced PFAS concentrations further away, as monitoring continues. The cost-effective and sustainable solution to remove PFAS exposure risk provides an alternative to expensive and ineffective pump & treat (P&T) systems.Tetra Tech, a global environmental consulting firm, has worked with Martha’s Vineyard Airport over the years, addressing a dry-cleaning solvent release and other environmental issues at the site. At the request of the airport, Tetra Tech conducted an initial, preemptive PFAS assessment in 2018, confirming the presence of PFAS, commonly known as “forever chemicals” in groundwater. The remediation goal was to stop further PFAS movement away from the site. Tetra Tech opted for an in situ remediation approach. A PlumeStop permeable reactive barrier (PRB) was installed to filter PFAS out of groundwater, sorbing the contaminants onto the aquifer matrix and preventing further plume migration.
No Further Action for Large PCE Plume Under Main Street, USA
Download the Case Study
Case study highlights:
- Closure achieved for a large chlorinated solvent plume in an urban area
- PCE sources rapidly eliminated and plume efficiently treated using a suite of REGENESIS in situ remediation technologies
- Despite access limitations, large PCE plume eliminated, resulting in NFA
This case study reviews a former dry cleaner site in a small town in western Indiana, where site regulatory closure was achieved after a large dissolved-phase PCE groundwater plume was successfully treated using PlumeStop, enhanced reductive dechlorination (ERD) amendments and S-MicroZVI from REGENESIS. Patriot Engineering, a leading Midwest environmental consulting firm, headquartered in Indianapolis, specified ERD as the most practical and economically viable method to effectively treat the large plume. Patriot’s strategy to achieve closure was to significantly reduce the PCE plume and then to demonstrate plume stability through post-remediation monitoring. By combining remediation technologies from REGENESIS with a highly efficient and cost-effective remediation design, Patriot’s treatment approach eliminated the PCE plume. Subsequent performance monitoring and analysis completed by Patriot demonstrated plume stability, earning the site a No Further Action status from Indiana Department of Environmental Management (IDEM).
PetroFix Estimated to Save $1 Million Compared to Long-Term Monitoring
Download the Case Study
Case study highlights:
- PetroFix achieved rapid and sustained MTBE reductions below cleanup objectives
- At only 8% of the cost of a monitoring only approach, PetroFix saved more than $1 million for this project
- West Central Environmental Consultants (WCEC) designed the remedy using the PetroFix Design Assistant™, backed by REGENESIS technical support
This case study reviews a successful PetroFix application that placed a Washington underground storage tank (UST) site on track for closure while saving more than $1,000,000 in comparison to alternate approaches considered at the site. The site is a former service station and bulk petroleum plant in Sunnyside, Washington, where petroleum hydrocarbons were discovered leaking from USTs in the late 1990s. WCEC, an environmental consulting company highly experienced in addressing petroleum-contaminated sites, investigated the site and observed light non-aqueous phase liquids (LNAPL or free product). In response, WCEC completed interim remedial measures, including excavating grossly impacted soils and installing a free product recovery system. WCEC completed further remedial investigation over the next several years. In Situ remediation activities began in the early 2000s with the injection of oxygen enhancing amendments to stimulate biologically-mediated aerobic oxidation of petroleum hydrocarbons. Investigation and oxidation injections were expanded to address other impacted site areas in phases. Although the oxygen enhancement injections reduced the hydrocarbon mass, soil and groundwater contamination remained, including MTBE (methyl-tert-butyl-ether) concentrations exceeding the Washington Department of Ecology’s action level.
PetroFix – EU and UK Project Experience
Download the Case Study
Case study highlights:
- PetroFix has been successfully used in over 600 sites across 15 countries worldwide, demonstrating its effectiveness in treating petroleum hydrocarbon contamination on a global scale.
- In a commercial redevelopment site in the UK, PetroFix was applied to treat diesel range TPH contamination, allowing for the installation of geothermal boreholes for climate control in a new development while minimizing disruption and ensuring a safe and rapid treatment process.
- PetroFix has been applied in various site types, including fuel depots, industrial tank farms, petroleum retail stations, and oil spill sites, showcasing its versatility and compatibility with different geologies and contamination levels.
This document provides an overview of our Petrofix® project experience across Europe and the UK. PetroFix offers a cost-effective, in situ treatment for petroleum hydrocarbon contamination. It has been used at more than 600 sites to date, across 15 countries worldwide. Applications listed include different project types, such as petrol filling stations, rail depots, active industrial manufacturing facilities, brownfield and oil spill sites, in varying geologies and contaminant concentrations.
Proven, Rapid, and Cost-Effective Petroleum Spill Treatment
Download the Case Study
Case study highlights:
- Nine sites IRSL treated with PetroFix have already achieved closure, most within one year after a single injection event
- PetroFix chosen at UNESCO World Heritage site due to sensitivity of a pristine water body at the site, offering a less disruptive approach to address PHCs
- IRSL proficiently uses the PetroFix Design Assistant to develop and store its own PetroFix remedial application designs
- Site remedies have led to significant cost savings for IRSL’s clients and demonstrated PetroFix as a viable means for treating PHC-contaminated sites in Canada
The case studies included in this multi-site review include sites where one of Canada’s largest and most experienced environmental remediation services companies InSitu Remediation Services Ltd. (IRSL) effectively used PetroFix in achieving site closures across Canada. InSitu Remediation Services Ltd. (IRSL), one of Canada’s largest and most experienced environmental remediation services companies, uses PetroFix to mitigate sites throughout Canada impacted by petroleum hydrocarbons (PHCs), relying on the technology as an effective, low-cost, and more sustainable remedial solution. As one of the first to apply PetroFix in the field, IRSL has deployed the PetroFix technology to remediate a large number of PHC-contaminated properties, with land use ranging from gasoline stations and commercial properties to residential homes and a national park lodge. PetroFix has quickly eliminated PHC impacts in groundwater at these sites and prevented contaminant movement away from impacted properties, thus eliminating potential human exposure to PHCs and protecting pristine, ecologically sensitive surface waters.
Cost-effective In Situ Remediation of Chlorinated Solvents in Svenljunga, Sweden
Download the Case Study
Case study highlights:
- In situ remediation of groundwater contaminated with Trichloroethylene (TCE) was chosen for a former fur factory in Svenljunga, Sweden, as excavation or thermal treatment was deemed too expensive.
- A targeted application of 3-D Microemulsion® using direct push technology (DPT) successfully reduced groundwater and soil concentrations of TCE, DCE, and VC by approximately 95%, well below remedial targets.
- The chosen remediation method, 3-D Microemulsion injection, was not only effective in achieving significant contaminant reduction but also cost-effective, with a cost of €21/tonne compared to the more expensive alternatives of excavation and thermal remediation.
In situ remediation of groundwater impacted with Trichloroethylene (TCE) was completed at a former fur factory in Svenljunga, Sweden, as it had been determined that excavation or thermal treatment would have been too expensive. A targeted application of 3-D Microemulsion® was performed using direct push technology (DPT) to complete the injections. Validation sampling showed that the concentrations in the groundwater and soils had been reduced by approx. 95%, to well below the remedial targets. 3-D Microemulsion (3DME) is an engineered electron-donor emulsion that offers a steady and long-term source of staged-release hydrogen (in the order of 4 to 5 years from a single application) to enhance the reductive dechlorination (ERD) of chlorinated compounds. It has been optimized to distribute widely upon injection, allowing for high volume applications, reducing the number of injection points and events required onsite. Click the logo to learn more about how 3DME works.
Reductive Dechlorination Approach Treats Large Chlorinated Solvent Plume
Download the Case Study
Case study highlights:
- Innovative combined remedy on active site effectively eliminates risk to adjacent property
- Remedy from REGENESIS chosen based on proven effectiveness in treating similar large CVOC plumes
- Design Verification Testing and placement validation guide a successful remedial application
This case study reviews the successful in-situ treatment of chlorinated solvents at a former food processing plant located in a suburb south of Indianapolis. PlumeStop, S-MicroZVI, 3DME and BDI Plus were used in combination to strongly inhibit CVOC plume migration near the site property boundary while enhancing abiotic and biotic degradation of CVOCs at this location and in the upgradient plume area. Patriot Engineering and Environmental, Inc. (Patriot), a leading consulting firm based in Indianapolis, investigated the site, discovering contaminants had migrated from an unidentified source and formed a large plume. In addition, it was found that the plume was being pulled toward a former (now inactive) public water supply well. The primary chlorinated volatile organic compounds (CVOCs) detected in the plume were tetrachloroethene (PCE), trichloroethene (TCE), and cis-1,2-dichloroethene (cis-DCE).
Injectable PRB Provides Rapid Remediation of Chlorinated Plume Allowing Redevelopment within Months
Download the Case Study
Case study highlights:
- An in situ permeable reactive barrier (iPRB) was installed combining PlumeStop, S-MicroZVI and BDI Plus reagents
- Additional Design Verification Testing (DVT) was completed by REGENESIS prior to full-scale works
- Remediation targets and the client’s economic requirements were achieved on time and within budget, under a guaranteed contract
Stringent regulatory targets achieved in short timescale, despite challenging site conditions. Historical industrial activities at a former silver frames manufacturing facility in Central Italy had caused chlorinated solvent contamination in the subsurface, which was extending beyond the site boundary. As the site was undergoing redevelopment into residential buildings, the construction company had a strict deadline for remediation to be completed and so a strategy was needed to avoid the long-term installation of active pumping equipment onsite.
Combined ISCR and ERD Remedial Approach Knocks Down PCE Concentrations in Poland
Download the Case Study
Case study highlights:
- Safe and easy co-injection of PlumeStop and S-MicroZVI
- A grid of 30 injection wells was used, with a 4m spacing between wells
- A rapid, significant drop in PCE concentrations was achieved in the entire treatment area, with no daughter products observed
- Monitoring is ongoing
Rapid groundwater treatment achieved at manufacturing plant, without daughter product build-up. At an active manufacturing plant in the region of Greater Poland, in the West of the country, historical perchloroethylene (PCE) contamination was found to be impacting both soil and groundwater. Environmental company PROTE determined that contamination originated from a number of spills and leakages that occurred over the >20 years of manufacturing on the site.The canal adjacent to the site was identified as a potential downgradient receptor vulnerable to impact from offsite advection of the contamination. Therefore, remediation was driven by a requirement to remove the site owner’s potential liability, whilst being completed within strict budgetary restrictions.
