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CF Systems Organics Extraction Process
New Bedford Harbor, Massachusetts
Applications Analysis Report
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CF Systems Organics Extraction Process, New
Bedford Harbor, Massachusetts (1,093K)
U.S. EPA Superfund Innovative Technology Evaluation (SITE) Program
Liquified Gas Solvent Extraction (LG-SX) Technology
CF Systems Corporation
ABSTRACT
CF Systems LG-SX technology uses
liquified gases to extract organic contaminants from soils, sludges, sediments, and
wastewaters. The low viscosities, densities, and surface tensions of these gases, when
liquified under pressure, result in higher rates of extraction compared to conventional
liquid solvents. The low densities accelerate gravity separation and the high volatilities
minimize the time and energy required to vaporize and recycle the solvent. Liquified
propane is typically used in a batch extractor-decantor to treat soils, sediments, and
sludges. Liquified carbon dioxide is used in a continuous-trayed tower design for
wastewaters and low-solids wastes. This technology is applicable to volatile and
semivolatile contaminants. A pilot-scale unit was demonstrated with polychlorinated
biphenyl-contaminated sediments from the New Bedford Harbor Superfund site (Massachusetts)
in September 1988. PCB concentrations ranged from 300 ppm to 2,500 ppm. Extraction
efficiencies were 90 to 98 percent for sediments with between 360 and 2,575 ppm. A
treatment efficiency of 99.9 percent was achieved for volatile and semivolatile organics
in aqueous and semi-solid wastes. Operating problems were encountered, but later corrected
in a full-scale application at Star Enterprise in Port Arthur, Texas.
Back to SITE Home Page
Posted June 22, 1999
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