Geosyntec  

Electrokinetic-Enhanced In Situ
Biological & Chemical Remediation

Geosyntec is at the forefront of technology development and application in Electrokinetic-Enhanced In Situ Remediation to overcome fundamental limitations challenging the remediation industry

Geosyntec employs technology-based strategies like Electrokinetics to meet our clients’ stewardship, financial, and compliance goals to remediate soil and groundwater contamination in challenging subsurface environments.

Electrokinetics Overview

Specific to Low Permeability Environments

As the processes underlying electrokinetics are independent of soil permeability, the process is particularly suited to environments where hydraulic delivery approaches fail.

Target Sources of Back-diffusion

Electrokinetic enhancement is designed to achieve rapid penetration and distribution of treatment fluids or nutrients into clays and other long-term sources of contamination to aquifers. Electrokinetic approaches are currently the only proven in situ alternative to thermal remediation technologies for addressing contamination in low permeability soils and rocks.

Low-cost Enhancement of Proven Technologies

The Electrokinetic infrastructure is based on simple engineering, using commonly available materials, and requires low power inputs to achieve field-scale homogeneous distribution of treatment reagents.

Case Study: Electrokinetics Technology

PCE Source Zone Treatment at a Former Industrial Facility, Denmark

The ability of electrokinetics to deliver electron donor (lactate) through a PCE source zone in a clay till was demonstrated at a former industrial site in Denmark.

The objectives of the test were to confirm the successes seen in site-specific bench scale testing of the technology, test the engineering design of the electrodes and recirculation and delivery systems, measure migration rates of electron donor in a real world system, and confirm that the applied voltage field did not have an adverse impact on KB-1® which was use to augment the indigenous organisms. The pilot test successfully demonstrated all of the objectives, with lactate appearing in all monitoring wells within days of application of the electric field, rapid increases in the concentrations of PCE degradation intermediates (cis-DCE and VC) due to the presence of the lactate, and the gradual increase in ethene in post-application monitoring (as KB-1® became acclimatized and spread throughout the treatment area).

How Electrokinetics Works

Electrokinetics provides a unique delivery mechanism for the enhancement of In Situ Chemical Oxidation, In Situ Bioremediation, and other proven treatment technologies.

Electrokinetics is the application of low DC voltage gradients to the subsurface through simple electrodes, which results in the migration of ions towards their oppositely charged electrode.

The applied voltage gradient also results in the bulk movement of groundwater from one electrode to another, through a process known as electro-osmosis. This process is highly efficient in clay-rich strata, and can result in migration of ions and dissolved compounds at the rate of several metres a month in tight clays.

For heterogeneous systems, where significant contaminant mass remains in the low permeability regions, application of electrokinetics after a hydraulic flood of amendment, donor, or oxidant results in rapid movement of the injected compound into the low permeability layers, greatly reducing the mass discharge from these sources after treatment.

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For More Information

Dave Reynolds
613-542-0228 dreynolds@geosyntec.com

James Wang
410-910-7622 jwang@geosyntec.com

Evan Cox
519-822-2230 ecox@geosyntec.com

About Geosyntec

Beyond electrokinetics, Geosyntec also delivers innovative solutions to projects in environmental studies and cleanup, infrastructure engineering and design, and natural resources assessment and restoration. Since our founding in 1983, Geosyntec has completed nearly 10,000 projects worldwide.

Our vision of success builds on a long-held belief that exceptional client service coupled with exceptional project solutions will result in long-term business relationships of mutual reward. We support our client service and project solutions approach through an internal culture of technical excellence and collegial relationships, common commitment to our core values, and the innovation and practical thinking our staff bring to every assignment.

We deliver solutions through Geosyntec and our wholly-owned, specialty affiliates with a combined staff exceeding 1000 engineers, scientists, and related technical and project support personnel. We serve our clients from more than 50 offices throughout the U.S., and locations in Australia, Canada, Malaysia, and the United Kingdom.

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