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Bergmann USA Soil Sediment Washing
Technology Applications Analysis Report
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Bergmann USA Soil Sediment
Washing Technology Applications Analysis Report (1,660K)
U.S. EPA Superfund Innovative Technology Evaluation (SITE) Program
Soil and Sediment Washing
Bergmann, A Division of Linatex
ABSTRACT
Bergmann developed a soil washing
technology that separates contaminated particles by grain size and density,
concentrating contamination in the fine particle fraction (less than 45
microns, µm). Contaminated soil is screened to remove coarse rock and
debris. Water is added to the remaining soil to form a slurry. Surfactants,
acids, bases, and chelators may be added to improve contaminant solubility.
The slurry is fed into an attrition scrubber followed by other mechanical
equipment designed to remove silts and clays from granular particles.
Settling tanks and cyclones improve particle separation. Four output streams
result: coarse clean fraction (>45 µm), enriched fine fraction, contaminated
humic materials (leaves, twigs, roots, etc.), and process wash water.
The coarse clean fraction can be backfilled or incorporated into concrete
or asphalt. The fine and humic fractions are typically de-watered before
treatment or, as appropriate, disposal. The wash water is treated, to
remove metals and organics, and recycled to the plant for reuse. A barge-mounted
pilot-scale system of the technology was demonstrated over five days in
April 1992 in the Saginaw Bay of Lake Huron just offshore of Essexville,
Michigan. PCB and metal contaminants were effectively concentrated in
the fine-particle fraction.
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Posted June 22, 1999
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