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U.S. EPA Superfund Innovative
Technology Evaluation (SITE) Program This document is available in the Adobe Acrobat PDF Format. Click here for information about Portable Document File (PDF) Formats. or Click here to directly download the Acrobat Reader. (To view the PDF, it is recommended that you use the latest version of Acrobat Reader.) TERRAMET® Soil Remediation System, COGNIS, INC. (46KB) Abstract The TERRAMET® soil remediation
system leaches and recovers lead (including metallic lead, and lead salts
and oxides), and other metals from contaminated soil, sludge, or sediment.
The system uses a proprietary aqueous leachant that is optimized through
treatability tests for the soil and the target contaminant. Pretreatment
may involve dry screening to remove oversize material; the oversize fraction
is usually clean after the surfaces are scrubbed through attrition. The
sand fraction is pretreated to remove dense metallic or magnetic materials
before subjecting the sand fraction to counter-current leaching. The fines
fraction is subjected to counter-current leaching to dissolve the absorbed
lead and other heavy metal species. Dissolved metal ions are recovered
from the aqueous leachate by reduction, liquid ion exchange, resin ion
exchange, or precipitation. The TERRAMET® system was evaluated
at the Twin Cities Army Ammunition Plant (TCAAP) in August of 1994. The
process treated 12 to 15 tons per hour of soil contaminated by lead and
copper at levels up to 3,000 ppm. Average removal efficiencies for lead
were about 75 percent. Posted October 8, 1999
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