PlumeStop® Liquid Activated Carbon™

Proven, Fast & Cost-Effective

  • Captures and biodegrades a wide range of contaminants
  • Distributes widely under low injection pressures
  • Biodegrades contaminants in-place
  • Stops contaminant migration and protects sensitive receptors
  • Addresses back-diffusion


Treatment Solution for Back Diffusion

Breakthrough Treatment for PFAS


Site Goals Achieved in Two Months

The Four PlumeStop Treatment Mechanisms

Dispersion, Sorption, Biodegradation and Regeneration

Dispersion within the Subsurface

PlumeStop is a liquid activated carbon™ material which consists of a very fine suspension of charged particles which resists clumping and has a water-like viscosity. As a result, PlumeStop is easily applied into the subsurface through gravity-feed or low-pressure injection.

Rapid Sorption of Dissolved-Phase Contaminants

Upon reagent injection, target contaminants partition out of the aqueous phase and sorb onto the liquid activated carbon™ matrix, thereby removing mobile contaminants from the immediate risk pathway. Concentration of the contaminants in this manner, in a matrix conducive to degrader colonization and activity, results in a direct increase in efficiency of contaminant destruction.

Biodegradation of Contaminants within the Matrix

Once in place and with contaminants partitioned onto its surface, PlumeStop is colonized by contaminant-degrading bacteria.

Regeneration of Sorption Sites for Long-Term Treatment

Enhanced biodegradation of contaminants within the biomatrix regenerates or frees up sorption sites allowing contaminants to further partition out of the groundwater. This allows a single application of PlumeStop to remain functional for an extended/ indefinite period of time.

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Treat Back-Diffusing, Low-Concentration Plumes

PlumeStop technology can be applied to inhibit spreading of contaminant plumes, to protect sensitive receptors, or to prevent contaminant migration across property boundaries. It is also effective tool for control and treatment of groundwater contamination associated with low-permeability porous formations and matrix back-diffusion, promoting diffusion out of the immobile porosity while preventing groundwater impact, and for treating sites with very low contaminant concentrations. Once in place PlumeStop is expected to last for decades with minimal impact on aquifer oxidation-reduction potential, permeability and geochemistry.

Case Study: PlumeStop rapidly treats low concentration chlorinated solvent plume

This case study describes the in situ remediation of a wide-spread chlorinated solvent plume beneath the train station and sourrounding urban area in Bologna, Italy. For the pilot test, REGENESIS installed 6 multi-level injection wells and applied specific doses of PlumeStop at the target depths. On-site works for the pilot test were completed in 3 weeks and included the execution of a range of tests in order to confirm the treatment effectiveness and create an accurate design for the full-scale application. Full-scale treatment comprised injection into the four identified ‘hot spot’ areas. In all treatment areas, PlumeStop has been co-injected with REGENESIS electron donors HRC® and HRC Primer®, to provide initial biostimulation and promote continual in situ bio-regeneration of the Liquid Activated Carbon.

Case Study: Combined Treatment at Urban Site

A historic chlorinated solvent spill from a former dry cleaning facility in Belgium had caused contamination of the soil and groundwater below the site. With a high seepage velocity (approx. 17 m/year), the contamination was found to be migrating towards a local stream, posing an unacceptable risk to the environment. REGENESIS was asked by Environmental Consultant ABO NV to provide a solution to treat the plume onsite and stop its migration over the site boundary.

Effective In Treating a Wide Range of Contaminants

PlumeStop is effective on most organic groundwater contaminants including hydrocarbons, halogenated compounds, and a wide variety of volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs). It is also effective in treating a range of PFAS contaminants (PFOA/PFOS).

Typical Applications

– Liquid-based direct-push injection through hollow rods

– Liquid-based direct-placement into boreholes

– Liquid-based injections in conjunction with Oxygen Release Compound (ORC)to support enhanced aerobic biodegradation

– Liquid-based injections in conjunction with Hydrogen Release Compound (HRC)to support enhanced anaerobic biodegradation

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FAQs about PlumeStop® Liquid Activated Carbon™

PlumeStop® Liquid Activated Carbon™ is a fast-acting groundwater remediation reagent which captures and biodegrades a range of contaminants. PlumeStop accomplishes treatment with the use of a highly dispersible, fast-acting, sorption-based technology which captures dissolved-phase contaminants within its matrix-like structure. Once contaminants are absorbed onto the regenerative matrix, biodegradation processes achieve complete remediation at an accelerated rate.

PlumeStop® is composed of very fine particles of activated carbon (>1-2µm) suspended in a proprietary colloidal fluid through the use of unique organic polymer dispersion chemistry. Once in the subsurface, the material behaves as a colloidal biomatrix binding to the aquifer matrix, removing contaminants from groundwater, and expediting permanent contaminant biodegradation. PlumeStop works in 4 phases: the first is dispersion within the subsurface, the second is rapid sorption of dissolved-phase contaminants, then biodegradation of contaminants within the matrix, and the final phase is regeneration of absorption sites for long-term treatment.

PlumeStop® is right for your project if you are trying to treat organic groundwater contaminants including hydrocarbons, halogenated compounds, a wide variety of volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs). PlumeStop is also effective in treating a range of PFAS contaminants (PFOA/PFOS). PlumeStop can be applied to inhibit the spreading of contaminant plumes, to protect sensitive receptors, or to prevent contaminant migration across property boundaries.