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EPA 540-MR-97/509
In Situ Electrokinetic Extraction System
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In Situ Electrokinetic Extraction System (16K)
ABSTRACT In Situ Electrokinetic Extraction System The ISEE technology developed by SNL is applicable for treating unsaturated soil contaminated with chromate ions. According to SNL, this technology can be modified to treat saturated contaminated soils and to remove contaminants besides chromate dissolved in the pore water. During the SITE demonstration, 13 tests were performed during six phases. The test areas ranged from 36 to 72 square feet over a zone of contaminated soil from 8 to 14 feet below ground surface. At the system’s preferred operating conditions determined by SNL (test 13), (1) approximately 200 grams (g) of hexavalent chromium were removed during about 700 hours of operation (0.29 g per hour), and (2) the overall removal efficiency for the system was approximately 0.13 g of hexavalent chromium per kilowatt hour.
Within the test areas, 18 out of 43 pre-demonstration soil samples
exceeded the TCLP limit of 5 milligrams per liter (mg/L) of total
chromium.
Posted April 2, 1999
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