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EPA 540/SR-98/500
Simultaneous Destruction of Organics and
Stabilization of Metals in Soils
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Simultaneous Destruction of Organics and
Stabilization of Metals in Soils (200K)
ABSTRACT
Simultaneous Destruction of Organics and
Stabilization of Metals in Soils
Emerging Technology Summary
EPA 540/SR-98/500
June 1998
The Center for Hazardous Materials Research (CHMR), through a Cooperative Agreement
with the U.S. Environ-mental Protection Agency's National Risk Management Research
Laboratory, conducted a laboratory evaluation of the Sulchem Process for treatment
of soils contaminated with organic hydro-carbons and heavy metals. The Sulchem
Process mixes the material being treated with elemental sulfur at elevated temperatures
in an inert reactor system. Organic hydrocarbons react with the sulfur to form
an inert fine solid of carbon and sulfur, hydrogen sulfide gas, and modest a
mounts of carbon disulfide. Heavy metals react to form sulfides or sulfidecoated
particles which are less soluble. The acid gases formed may be scrubbed or treated
to recover elemental sulfur using an auxiliary process unit. At processing temperatures
of 2500 to 35O0C, destruction and removal efficiencies
for aromatic hydrocarbons from phenanthrene to benzopyrene were all in excess
of 99%. Using the EPA Method 1311, Toxicity Characteristic Leaching Procedure
(TCLP), cadmium, copper, lead, nickel, and zinc were significantly reduced following
treatment of the soil by the Sulchem process. Copper TCLP values were reduced
most effectively; lead was reduced below regulatory targets when concentrations
in the original soil were below about 10,000 ppm. Cadmium was reduced below
TCLP limits when the concentration in the original soil was below several thousand
ppm. Process economics for remedial soil treatment were estimated to be in the
range of $105 to $181/ton depending on the size of the site and the processing
rate.
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Posted April 2, 1999
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