ELECTROOSMOTIC SOIL REMEDIATION
ELECTROOSMOTIC SOIL REMEDIATION
Terran Corporation can solve your hard to treat soil contamination problems. Terran employs electroosmosis to mobilize volatile organic contaminants including DNAPLs from clay or mixed soil types. Our systems use inexpensive materials with expert design and conventional or novel treatment systems to remove tough organic contamination. Treatment systems can be ex-situ or in-situ and include the patented LasagnaTM system.
Lasagna is a Registered Trademark of Monsanto Company, St. Louis, MO
We have prepared a short paper about electroosmosis.
A Case for Electroosmotic Remediation (PDF version of this paper)
We have also prepared two short presentations about electroosmosis.
Principles of Electrokinetics
The Latest on Lasagna
As each slide is displayed you can read notes that provide a brief description of the slide.
Terran’s current electroosmosis experience includes the design and implementation of the first LasagnaTM site at DOE’s Paducah Gaseous Diffusion Plant for the in-situ treatment of TCE in clay using electroosmosis and zero valent iron treatment. Electroosmosis-induced pore water flow and elevated temperatures have been proven effective in the treatment of TCE in clay soils in a most cost efficient manner. At Paducah, the process reduced the soil concentrations from an average of 84 mg/kg (with a high of 1,500) to an average of 0.38 mg/kg (with a high of 4.5) in two years of operation. The project was highlighted in a recent "Technology News and Trends" newsletter (EPA, TIO). The Final RA Report for Paducah show the details of the installation and verification soil sampling.
Let Terran Corporation help you. If you have volatile organic contamination in a mostly clay soil, contact Chris Athmer or Brent Huntsman at 937-320-3601.
Additional References
Record of Decision (ROD) for Paducah Site Specifying Lasagna
GWRTAC Technology Overview Report - Electrokinetics
Rapid Commercialization Initiative Verification Statement for LasagnaTM, March 2, 1998. This statement shows the agencies that recognize Lasagna as an acceptable remediation technology.
The Lasagna Technology for In Situ Soil Remediation. 1. Small Field Test, Sa V. Ho , Christopher Athmer, P. Wayne Sheridan, B. Mason Hughes, Robert Orth, David Mckenzie, Philip H. Brodsky, Andrew Shapiro, Roy Thornton, Josepy Salvo, Dale Schultz, Richard Landis, Ron Griffith and Steve Shoemaker, Environmental Science & Technology, 33, 7, 1086-1091, 1999.
LasagnaTM Soil Remediation, U. S. Department of Energy, Innovative Technology Summary Report (Green Book).
Cooking Up Solutions, Cleaning Up With LasagnaTM, United States Environmental Protection Agency, Solid Waste and Emergency Response, EPA505-F-99-004, April 1999.
LasagnaTM/RTDF Technical Documents, Lasagna Remediation Technology, The Remediation Technologies Development Forum (RTDF).
Copyright © 2004 by Terran Corporation, Beavercreek, Ohio U.S.A.
Phone: 937-320-3601, Fax: 937-320-3620
www.terrancorp.com, This page edited August 19, 2004 13:24
Send mail to webmaster@terrancorp.com with questions or comments about this web site.
Innovative Technology Inventory (ITI)
Terran Corporation
Lasagna™
| Company Address: Contact: Christopher Athmer |  |
Technology Type:
Remediation
Technology Description:
Click here to enlarge the image
LasagnaTM is the integration of electroosmosis with in-situ treatment designed to provide uniform treatment of non-homogenous soils or clay and silt-laden soils. Electroosmosis is used to move soil pore water and contaminants to treatment zones placed in the contaminated area. A set of steel electrodes and a series of treatment zones are emplaced around and in the contaminated soil with little or no waste soil. A DC voltage is applied to the electrodes causing pore water and contaminants to move towards the negative electrode in a very uniform manner. Intercepting treatment zones are designed to destroy or capture contaminants in-situ. Soil Heating is an additional benefit to using electroosmosis when treating volatile organics. Soil temperatures can easily reach 80oC in moderately conductive soils causing increased mobilization of volatile species. The entire soil mass between the electrodes is affected. According to Terran Corporation, uniform pore water movement and elevated soil temperatures make electroosmosis the most effective way to remediate contamination in silts and clays.
Application:
Lasagna is best suited for fine-grained soils like clay and silt or heterogeneous soils. Electroosmosis, unlike hydraulic or diffusion processes, is not sensitive to pore size. Lasagna is a proven technology for trichloroethylene (TCE) at DNAPL or pure phase levels of contamination in clay using zero valent iron treatment zones. The technology can be easily adapted to other contaminants using similar treatment schemes.
Environmental Benefits:
The primary environmental benefit is the cleanup of contaminated soil with a minimum of disruption to the soil and the surrounding area. Minimal waste is produced and no contamination is brought above ground. Exposure to site personnel and site neighbors is kept to a minimum.
Performance:
At a Department of Energy (DOE) site in Paducah, KY, TCE contaminated soil was treated effectively using the Lasagna process. The levels of contamination before treatment were as high as 1500 mg/kg and post treatment levels were around 1 mg/kg. According to Terran Corporation, lower levels can be achieved. The DOE site is approximately 10,000 cubic yards and the depth treated was 45 feet. Larger and deeper applications are definitely possible.
Limitations:
Lasagna does not work well in sandy soils where there is not enough hydraulic resistance to create significant electroosmotic gradients. That is, forward movement generated by electroosmosis is countered by the prevailing hydraulic flow. Highly electrically conductive soils such as coastal or saline soils are also not practical due to the high current draw and excessive soil heating.
Cost:
Cost for Lasagna is about $50 - $100 per yard depending on the scale of application. A large portion of the cost is the installation of the materials (capital). The operational costs are low. The primary operational cost is electricity. Once installed, there is minimal site inspection required. System monitoring can be done remotely.
posted by Lá Xanh @ 3:34 AM
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