Apparatus and method for soil decontamination

• US 4,882,021 A
• Filed: 01/15/1988
• Issued: 11/21/1989
• Est. Priority Date: 01/15/1988
• Status: Expired due to Fees

• Current Assignee: Daniel H. Barnhart
• Original Assignee: Daniel H. Barnhart
• Inventors: Barnhart, Daniel H.
• Primary Examiner(s): Niebling, John F.
• Assistant Examiner(s): Hsing, Ben C.
• Application Number:
  US07/144,928
• Time in Patent Office: 676 Days
• Field of Search: 204/157.15, 204/157.6, 204/157.61, 204/157.4, 204/157.41, 204/158.2, 204/157.3, 204/158.21, 204/157.94, 204/157.95, 204/193, 422/186.3, 422/184
• US Class Current: 204/157.15
• CPC Class Codes: B01J 19/123 Ultraviolet light
• CPC Class Codes: B01J 2219/187 inclined at an angle to the horizontal or to the vertical plane
• CPC Class Codes: B01J 8/10 moved by stirrers or by rotary drums or rotary receptacles or endless belts
• CPC Class Codes: B09C 1/08 chemically

Abstract

Disclosed is an apparatus and method for relatively rapid, on-site soil decontamination in a confined area without significant toxic off-gassing. The disclosed method includes treating the contaminated soil with both a dry and wet chemical, mixing the chemically treated soil, and exposing the mixed soil to ultra violet light rays.

Claims

1. An apparatus for decontaminating soil, comprising:

a mixer;

a first conveyer having an output end connected to an input of said mixer;

first hopper means for holding said soil and distributing it onto an input end of said first conveyor;

second hopper means for holding a catalytic compound and adding it to said distributed soil;

introduction means for introducing an oxidant into said input end of said mixer, said mixer being operable to mix said soil, catalyst and oxidant and thereby provide mixed soil;

a second conveyer operable to collect said mixed soil from an output end of said mixer; and

means for radiating said collected mixed soil with ultraviolet light.

2. The apparatus of claim 1 wherein said mixer is a trommel having an inner wall whereon a plurality of rectangular teeth are fixedly disposed.

3. An apparatus for performing soil decontamination as in claim 1 wherein said oxidant is in a liquid state and wherein said introduction means comprises a sprayer mechanism.

4. An apparatus for performing soil decontamination as in claim 3 further comprising trailer means for supporting thereon said mixer, said radiating means and said first and second conveyors, said trailer means having means for detachably coupling to a truck.

5. An apparatus for performing soil decontamination as in claim 4 wherein said trailer means comprises a first trailer and a second trailer, said second trailer being detachably and pivotally coupled to said first trailer and being disposed to support said second conveyor and having the capability to raise and lower at least one end of said second conveyor.

6. In the method of soil decontamination, the steps of:

conveying said soil and a catalyst to a mixer;

depositing said soil, said catalyst and an oxidant within said mixer;

mixing said soil, said catalyst and said oxidant within said mixer, thereby forming a mixture;

transporting said mixture from said mixer; and

radiating said transported mixture with ultra violet light.

7. In the method of claim 6, wherein the step of conveying includes the steps of:

gravitationally feeding said soil onto a first conveyor belt; and

depositing said catalyst upon said soil on said first conveyor belt.

8. In the method of claim 6 wherein said oxidant is in a liquid state and the step of depositing includes the step of spraying said oxidant into said mixer.

9. In the method of claim 8 wherein said oxidant is a mixture of approximately five to ten parts of water and one part of hydrogen peroxide.

10. In the method of claim 9 wherein said oxidant is applied at a rate of approximately five quarts of oxidant for every four cubic feet of soil.

11. In the method of claim 6, the additional steps of:

drawing vapors from said mixer; and

filtering said vapors.

12. In the method of claim 6 wherein said oxidant includes hydrogen peroxide.

13. In the method of claim 6 wherein said catalyst is a silicate based inorganic polymer.

14. In the method of claim 13 wherein the ratio of soil to catalyst is four to one.