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 TERRA-KLEEN RESPONSE GROUP, INC.
(Solvent Extraction Treatment System)

This vendor is participating in the EPA Superfund Innovative 
Technology Evaluation (SITE) Program.  The following technology 
profile has been reproduced from the SITE Technology Profile 
document, 7th edition.  The SITE profile has been supplemented by 
MVA Consulting Inc. using information obtained from the vendor or 
from other SITE publications, referenced at the end of this file. 


TECHNOLOGY DESCRIPTION:

The solvent extraction treatment system was developed by Terra-Kleen 
Response Group, Inc. (Terra-Kleen), to remove semivolatile
and non-volatile organic contaminants from soil.  This batch
process system uses a proprietary solvent blend to separate
hazardous constituents from soils, sediments, sludge, and debris. 
The U.S. EPA Office of Pesticides and Toxic Substances has made a
written finding that the Terra-Kleen solvent is nontoxic.

A schematic diagram of the Terra-Kleen treat-ment system is shown
below.  Treatment begins after excavated soil is loaded into the
extraction tanks.  Clean solvent from the solvent storage tank is
pumped into the extraction tanks.  The soil and solvent mixture
is held in the extraction tank for a time period sufficient to
solubilize organic contaminants into the solvent, separating them
from the soil.  The contaminant-laden solvent is then removed
from the extraction tanks and pumped into the sedimentation
tanks.  Suspended solids settle or are flocculated in the
sedimentation tank, and are then removed.

Following solvent extraction of the organic con-taminants, any
residual solvent in the soil is removed using soil vapor
extraction and biological treatment.  Soil vapor extraction
removes the majority of the residual solvent, while biological
treatment reduces residual solvent to trace levels.  The treated
soils are then removed from the extraction tanks.

The solvent regeneration process begins by pumping contaminant-
laden solvent from the sedimentation tank through a
microfiltration unit and a proprietary solvent purification
station.  The microfiltration unit first removes any fines
remaining in the solvent.  The solvent purification station
separates organic contaminants from the solvent and concentrates
them, reducing the amount of hazardous waste for off-site
disposal.  The regenerated solvent is pumped into the clean
solvent storage tank for use in treating additional soil.

WASTE APPLICABILITY:

The Terra-Kleen solvent extraction treatment system is a waste
minimization process designed to remove the following organic
contaminants from soils:  polychlorinated biphenyls (PCB),
chlorinated pesticides, polycyclic aromatic hydrocarbons (PAH),
pentachlorophenol, creo-sote, polychlorinated dibenzo-p-dioxins
(PCDD), and polychlorinated dibenzofurans (PCDF).  The technology
also has the capacity to remove organic contaminants, such as
PCBs, from low- level radioactive wastes.

The Terra-Kleen solvent extraction system does not require soil
screening equipment to remove debris or large objects from the
contaminated soil before treatment.  The system is trans-portable
and can be configured to treat small quantities of soil (1 to
1,000 cubic yards) as well as large volumes generated at remedial
sites.

STATUS:

Terra-Kleen demonstrated its solvent extraction treatment system
under the SITE Demonstration Program between May 16 and June 11,
1994.  The technology was demonstrated at the Naval Air Station
North Island Site 4, in San Diego, California.  Soils at Site 4
are contaminated with heavy metals, volatile organic compounds
(VOC), semivolatile organic compounds (SVOC) (including PAHs),
PCBs (Aroclor 1260), dioxins, and furans. 

DEMONSTRATION RESULTS:

Preliminary findings from the Terra-Kleen SITE demonstration are
summarized as follows:

>  PCB Aroclor 1260 concentrations were reduced from a maximum
   of 170 milligrams per kilogram (mg/kg) in untreated soil to
   approximately 2 mg/kg in treated soil.  The average removal
   efficiency was 98.39 percent.

>  The system can efficiently concentrate PCBs into a smaller
   waste volume for off-site disposal.

>  The treatment system's PCB removal efficiency was
   reproducible for all batches run during this demonstration.

To provide additional information on the tech-nology's
capabilities, samples were also collected and analyzed for VOCs,
SVOCs, PCDD, and PCDF.  The analytical data from these samples
are not yet available.  All findings of the Terra-Kleen SITE
demonstration, including sample analytical results, will be
discussed in the SITE technology capsule and the innovative
technology evaluation report.

Additional data is being collected at the Naval Communication
Station in Stockton, California.  The system is treating soil
contaminated with chlorinated pesticides at concentrations up to
600 mg/kg.  Preliminary data indicates that target levels of 1
mg/kg are being achieved.

FOR FURTHER INFORMATION:

EPA PROJECT MANAGER:
Mark Meckes
U.S. EPA
Risk Reduction Engineering Laboratory
26 West Martin Luther King Drive
Cincinnati, OH  45268
513-569-7348
Fax: 513-569-7676

TECHNOLOGY DEVELOPER CONTACT:
Alan Cash
Terra-Kleen Response Group, Inc.
7321 North Hammond Avenue
Oklahoma City, OK  73132
405-728-0001
Fax: 405-728-0016
__________________________________________________________

Sources of information in this profile:

EPA Superfund Innovative Technology Evaluation Program 
        Technology Profiles Seventh Edition, November 1994. 
        EPA/540/R-94/526.

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