Hydraulic and earth engineering – Soil remediation – In situ contaminant removal or stabilization
Patent
1995-09-13
1997-02-04
Taylor, Dennis L.
Hydraulic and earth engineering
Soil remediation
In situ contaminant removal or stabilization
210747, 588249, B09B 300
Patent
active
055991378
ABSTRACT:
A mobile apparatus and method for treating contaminated soil is disclosed. The apparatus consists of three interconnected subunits, namely a fluidized bed reactor for segregating an aqueous soil slurry based on particle size; a metals extraction unit for removing heavy metals and other contaminants from the contaminated soil fraction; and a water treatment system utilizing a high density sludge process to remove metals from the contaminated aqueous phase. The fluidized bed reactor includes a relatively small mixing chamber and a relatively large settling chamber which are partially separated by a baffle. Pressurized gas and foaming agent are dispersed into the mixing chamber to segregate the soil particles into a first fraction containing relatively small, contaminated soil particles and a second fraction containing relatively large, uncontaminated soil particles. The first fraction is continuously withdrawn from an upper portion of the reactor as a foam and a soil slurry containing the relatively uncontaminated second fraction is continuously withdrawn from a lower portion of the reactor. The soil slurry is dewatered by means of a hydrocyclone and a solids trap. Water, foaming agent and any suspended fines are recycled to the reactor vessel.
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Lim Choom J.
Lim Kok-Seng
Nelson John C.
Stephenson Robert J.
Chemtech Analysis Inc.
Taylor Dennis L.
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