Reclamation system for contaminated material

• US 5,114,568 A
• Filed: 07/13/1990
• Issued: 05/19/1992
• Est. Priority Date: 07/13/1990
• Status: Expired due to Fees

• Current Assignee: Earth Solutions Incorporated, Victoria Drummond
• Original Assignee: Earth Solutions Incorporated
• Inventors: Stepenoff, Gary F., Bess, Vicki H., Brinsmead, Brian J., Huxel, Gary R., Wetmore, John A.
• Primary Examiner(s): Cintins, Ivars
• Assistant Examiner(s): Lithgow, Thomas M.
• Application Number:
  US07/553,536
• Time in Patent Office: 676 Days
• Field of Search: 209/615, 209/170, 209/211, 210/241, 210/512.3, 210/512.2, 210/512.1, 210/221.2, 210/751, 210/703, 210/787, 210/788, 210/789, 208/425, 196/14.52
• US Class Current: 209/170
• CPC Class Codes: B01D 17/00 Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion devices for separating or removing fatty or oily substances or similar floating material from water, waste water, or sewage C02F1/40; cleaning or keeping clear the surface of open water from oil or like materials E02B15/04; arrangements for separating lubricants from refrigerants F25B43/02
• CPC Class Codes: B01D 17/0205 by gas bubbles or moving solids
• CPC Class Codes: B01D 17/0217 by centrifugal force
• CPC Class Codes: B01D 21/267 by using a cyclone
• CPC Class Codes: B01D 2221/04 Separation devices for treating liquids from earth drilling, mining separation of well effluents E21B43/34, flotation in general B03D1/00
• CPC Class Codes: B01D 2221/08 Mobile separation devices
• CPC Class Codes: B03D 1/1412 with baffles, e.g. at the wall for redirecting settling solids
• CPC Class Codes: B03D 1/1425 air-sparged hydrocyclones
• CPC Class Codes: B03D 1/1462 Discharge mechanisms for the froth
• CPC Class Codes: B03D 1/1468 Discharge mechanisms for the sediments
• CPC Class Codes: B03D 1/16 with impellers; Subaeration machines mixing gases or vapours with liquids B01F23/20
• CPC Class Codes: B09C 1/02 Extraction using liquids, e.g. washing, leaching , flotation

Abstract

A soil reclamation system that separates the contaminant from all soil particles greater than one micron in diameter and generates resuable soil and contaminant products. The process is based on a novel application of gas-sparged centrifugal separation under operating conditions and equipment specifications tailored to optimize the separation of the particular contaminant. The apparatus is mounted on a front-end loader for mobility and self-contained on site operation.

Claims

1. An apparatus for removing toxic material from contaminated material by gas sparged centrifugal techniques comprising, in combination:

cylindrical separation chamber means for containing a slurry of the contaminated material;

coaxially rotating disks means located coaxially within said cylindrical separation chamber means for rotating along the axis of said cylindrical separation chamber means;

means coupling to said coaxially rotating disks means for rotating said coaxially rotating disks means to create a vortex within said cylindrical separation chamber means thereby subjecting said slurry to centrifugal classification, said centrifugal classification causing relatively heavier material particles in said slurry to accumulate and exit the chamber tangentially along the outer edge of said vortex and relatively lighter material and toxic material in said slurry to accumulate and exit the chamber axially along the center of said vortex;

means to feed said slurry of the contaminated material into the center of said vortex;

gas sparging means for sparging a stream of gas into said vortex from a stationary wall of said cylindrical separation chamber means thereby creating boundary layer turbulence to increase particle dispersion and improve the flotation characteristics of the slurry to obtain more rapid separation of lighter material and toxic material entrained in the gas phase from relatively heavier material particles;

means for isolating said lighter material and toxic material collected in gaseous suspension from the center of said vortex from the gas phase in which they are entrained; and

means for isolating said heavier material from the outer edge of the vortex.

2. The apparatus described in claim 1, wherein said means to feed said slurry comprises:

an annular feed chamber means axially connected to said material is fed tangentially into said annular feed chamber means to create turbulence and attrition for maximum dispersion and friction separation of the various particles, and wherein the slurry is then fed through the center of said annular feed chamber means to the center of said vortex.

3. The apparatus described in claim 2, further comprising:

a toxic material tank for collecting and storing the toxic materials recovered from said cylindrical separation chamber means.

4. The apparatus described in claim 1, further comprising:

a material reservoir means for receiving batches of toxic material, wherein liquid from a liquid tank is added to form said slurry of contaminated material.

5. The apparatus described in claim 4, further comprising:

means for circulating the liquid from said liquid tank into said material reservoir means to mix with said contaminated material and form said slurry, means for causing said slurry to flow from said material reservoir means to said cylindrical separation chamber, means for recirculating said liquid phase to said liquid tank, and for returning said decontaminated material to said material reservoir means.

6. The apparatus described in claim 5, further comprising:

a vehicle upon which said chamber means, said tank and said material reservoir means is mounted for mobility and for self-contained site operation.

7. The apparatus described in claim 6, wherein said vehicle is a front-end loader and said material reservoir means is its loading bucket.

8. The apparatus described in claim 7, wherein said front-end loader is powered by a diesel engine.

9. The apparatus described in claim 8, wherein said means to rotate said disks means comprises a turbine, means to channel exhaust gas from said diesel engine to said turbine for powering said turbine, means to channel said exhaust gas from the turbine to the gas sparging means for sparging gas into the vortex.

10. An apparatus for removing toxic material from contaminated soil comprising, in combination:

cylindrical separation chamber means for containing a slurry of the contaminated material;

coaxially rotating disks means located coaxially within said cylindrical separation chamber means for rotating along the axis of said cylindrical separation chamber means;

means for rotating said disks means for creating a vortex within said cylindrical separation chamber means thereby subjecting said slurry to centrifugal classification, said centrifugal classification causing relatively heavier soil particles in said slurry to accumulate along the outer edge of said vortex and relatively lighter soil and toxic material in said slurry to accumulate axially along the center of the vortex;

inner cylindrical duct means coupled to said disks means and protruding axially through said disks means for receiving relatively lighter soil and toxic material that has accumulated along the center of the vortex;

gas sparging means for sparging a stream of gas into said vortex from a stationary wall of said cylindrical separation chamber means thereby creating boundary layer turbulence to increase particle dispersion and improve the flotation characteristics of the slurry to obtain more rapid separation of lighter material and toxic material entrained in the gas phase from relatively heavier soil particles;

stationary degassing chamber means coupled to said rotating inner cylindrical duct means for separating said gaseous suspension into a liquid contaminant phase, containing a relatively lighter soil solid phase, and a gas phase, and wherefrom each phase is recovered outside said cylindrical separation chamber means;

means to feed said slurry into the cylindrical separation chamber;

baffle means mounted inside said cylindrical separation chamber means for directing the feed of said slurry of contaminated soil toward the center of said vortex thereby forming a solid accumulation space in the proximity of the point of discharge of said relatively heavier soil particles from the outer edge of said vortex towards said accumulation space for concentration and tangential discharge;

a plurality of radial compartment means for collecting intermediate weight soil particles suspended in an intermediate portion of said vortex through the annular space between said inner cylindrical duct means and said coaxially rotating disks means, each of said radial compartment means comprising a hydrocyclone structure for separating said intermediate weight soil particles from the liquid phase in which they are suspended, and further comprising discharge channels for the recovery of said intermediate weight soil particles and said liquid phase; and

said means to feed said slurry comprises an annular feed chamber means which is axially coupled to said cylindrical separation chamber means for feeding the slurry axially to the center of the vortex;

means to isolate said heavier soil form the outer edge of the vortex.

11. The apparatus described in claim 10, further comprising:

a toxic material tank for collecting and storing the toxic material recovered in said cylindrical separation chamber means.

12. The apparatus described in claim 11, further comprising:

a liquid tank for collecting and storing the liquid used to generate said slurry and the liquid recovered from the separation of the solid soil from the slurry in said cylindrical separation chamber means.

13. The apparatus described in claim 12, further comprising:

a soil reservoir means for receiving batches of contaminated solid, means for injecting the liquid from the liquid tank into the reservoir means to form said slurry of contaminated soil.

14. The apparatus described in claim 13, wherein said means for injecting the liquid comprises

a first pump and plumbing means, means for causing said slurry to flow from said reservoir means to the cylindrical separation chamber means which comprises a second pump and second plumbing means, and means for recirculating said liquid phase to the liquid tank comprising a third pump and third plumbing means;

and

means for returning said decontaminated soil to said soil reservoir means.

15. The apparatus described in claim 14, further comprising:

a front-end loader upon which said chamber means, said liquid tank and said reservoir means are mounted for mobility and for self-contained site operation.

16. The apparatus described in claim 15, wherein said soil reservoir means is the loading bucket of said front-end loader.

17. The apparatus described in claim 16, wherein said front-end loader is powered by a diesel engine.

18. The apparatus described in claim 17, wherein the means for rotating said disks means comprises a turbine, means to channel exhaust gas from said diesel engine to said turbine to power said turbine, means to move said gas from said turbine to the gas sparging means.

19. The apparatus described in claim 18, wherein said plurality of radial compartments consist of eighteen equal units distributed evenly around the axis of said cylindrical separation chamber means.

20. The apparatus described in claim 19, wherein two identical cylindrical separation chamber means are combined coaxially, in mirror image of one another, and are driven by a single turbine mounted between and in symmetrical relationship to said cylindrical separation chamber means.

21. An apparatus for removing certain material from a combination of materials by gas sparged centrifugal techniques comprising, in combination:

cylindrical separation chamber means for containing a slurry of the combination of material;

coaxially rotating disks means located coaxially within said cylindrical separation chamber means for rotating along the axis of said cylindrical separation chamber means;

means coupled to said coaxially rotating disks means for rotating said coaxially rotation disks means to create a vortex within said cylindrical separation chamber means thereby subjecting said slurry to centrifugal classification, said centrifugal classification causing relatively heavier material particles in said slurry to accumulate and exit the chamber tangentially along the outer edge of the vortex and relatively lighter material in said slurry to accumulate and exit the chamber axially along the center of the vortex;

means to feed said slurry of the combination of materials into the center of the vortex;

gas sparging means for sparging a stream of gas into said vortex from a stationary wall of said cylindrical separation chamber means thereby creating boundry layer turbulence to increase particle dispersion and improve the flotation characteristics of the slurry to obtain more rapid separation of lighter material entrained in the gas phrase form relatively heavier material particles;

means for isolating said lighter material collected in gaseous suspension from the center of the vortex from the gas phase in which they are entrained; and

means for isolating said heavier material form the outer edge of the vortex.