Cleaning and liquid contact with solids – Apparatus – With treating fluid purifying or separating means
Patent
1998-03-17
1999-04-27
Stinson, Frankie L.
Cleaning and liquid contact with solids
Apparatus
With treating fluid purifying or separating means
134111, 134201, 134132, 134 65, B08B 304
Patent
active
058968768
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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Blackmon Robert N.
Stinson Frankie L.
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