Method and apparatus for decontamination of poly chlorinated bip

Details Method and apparatus for decontamination of poly chlorinated bip Method and apparatus for decontamination of poly chlorinated bip

1996-12-06

1998-07-14

Warden, Jill

Cleaning and liquid contact with solids

Processes

Including regeneration, purification, recovery or separation...

134 10, 134 26, 134 40, B08B 704

Patent

active

057798133

ABSTRACT:
A method and apparatus is provides for decontamination of soil from contaminates such as polychlorinated biphenyls. The method involves (a) admixing a short chain alcohol and a long chain alcohol to provide a solvent composition, (b) admixing the solvent composition with the contaminated soil to extract the contaminant from the soil into the solvent to form contaminated solvent, (c) separating the soil from the contaminated solvent, (d) washing of the decontaminated soil with water to remove residual solvent from the soil, and (e) distillation of the contaminated solvent to separate the reusable short chain alcohol as a light fraction from a heavy fraction containing the long chain alcohol and the contaminant. The apparatus includes (a) a mixer for mixing the soil and solvent, (b) a centrifuge for separating fines from decanted contaminated solvent, (c) a distillation unit for separating the solvent into a reusable light fraction and a waste heavy fraction, and (d) a water reclamation unit for removing residual solvent from the wash water. The method and apparatus are usable for reclaiming contaminated soils.

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