Method and apparatus for remediating contaminated soil

• US 4,927,293 A
• Filed: 02/21/1989
• Issued: 05/22/1990
• Est. Priority Date: 02/21/1989
• Status: Expired due to Fees

• Current Assignee: Randy P. Campbell
• Original Assignee: Randy P. Campbell
• Inventors: Campbell, Randy P.
• Primary Examiner(s): Massie, IV, Jerome W.
• Assistant Examiner(s): SMITH, MATTHEW J
• Application Number:
  US07/312,934
• Time in Patent Office: 455 Days
• Field of Search: 404/75, 404/76, 404/90, 404/91, 404/92, 404/111, 405/128, 405/129, 47/DIG. 10
• US Class Current: 405/128.7
• CPC Class Codes: B09C 1/00 Reclamation of contaminated soil
• CPC Class Codes: B09C 1/08 chemically

Abstract

A remediating apparatus has a conveyor which moves contaminated material, a main hopper which holds a load of contaminated material and dispenses the material onto the conveyor at a receiving location, and an auxiliary hopper adjacent the main hopper which holds a load of an absorbent material and dispenses the material onto the contaminated material as the material is moved toward a transfer location. The apparatus also has an oxidizing material applicator and an aerator associated with an elongated mixing chamber. Also, a mixing and conveying auger rotatably mounted in the mixing chamber concurrently mixes the contaminated and absorbent material received in the mixing chamber at the transfer location and transports them from the transfer location to a deposit location. Spray nozzles of the applicator connected in communication with the mixing chamber spray pressurized oxidizing material on the mixture of contaminated and absorbent materials. Air nozzles of the aerator connected in communication with the mixing chamber inject air under pressure in the mixture of contaminated, absorbent and oxidizing materials to aerate the materials concurrently as the oxidizing material is sprayed thereon and the contaminated, absorbent and oxidizing materials are being mixed to produce a reaction therebetween and form reaction by-products which are more environmentally acceptable than the contaminated material for discharge at the deposit location.

Claims

1. An apparatus for remediating contaminated material, comprising:

(a) means for conveying a contaminated material from a receiving location to a transfer location;

(b) means for dispensing an absorbent material on the contaminated material between said receiving and transfer locations;

(c) means for receiving the contaminated and absorbent materials at said transfer location and for concurrently mixing the materials together and transporting them from said transfer location to a deposit location;

(d) means for applying an oxidizing material on the contaminated and absorbent materials between said transfer and deposit locations to produce mixing of the oxidizing material therewith between said transfer and deposit locations; and

(e) means for injecting oxygen containing gas the contaminated, absorbent and oxidizing materials between said transfer and deposit locations concurrently as the oxidizing material is being applied and the contaminated, absorbent and oxidizing materials are being mixed to produce a reaction therebetween which forms reaction by-products more environmentally acceptable than the contaminated material for discharge at said deposit location.

2. The apparatus of claim 1 further comprising:

means for collecting any volatile reaction byproducts to prevent release thereof to ambient atmosphere.

3. The apparatus of claim 2 wherein said transporting and mixing means includes an elongated mixing chamber, a combined mixer and conveyor rotatably mounted therein and means for rotatably driving said combined mixer and conveyor.

4. The apparatus of claim 3 wherein said collecting means is at least one storage cannister connected in communication with said mixing chamber for receiving the volatile reaction by-products.

5. The apparatus of claim 1 further comprising:

means for receiving and holding a load of contaminated material and for dispensing the contaminated material in a continuous flow from the load thereof.

6. The apparatus of claim 5 wherein said contaminated material holding and dispensing means includes a main hopper.

7. The apparatus of claim 1 wherein said conveying means is operable for continuous conveying of the contaminated material from said receiving to transfer locations.

8. The apparatus of claim 7 wherein said conveying means includes a belt conveyor and means for supporting and driving said conveyor.

9. The apparatus of claim 1 further comprising;

means for receiving and holding a load of the absorbent material and for dispensing the absorbent material in a continuous flow from the load thereof.

10. The apparatus of claim 9 wherein said absorbent material holding and dispensing means includes an auxiliary hopper.

11. The apparatus of claim 1 wherein said transporting and mixing means includes an elongated mixing chamber, a combined mixer and conveyor rotatably mounted therein and means for rotatably driving said combined mixer and conveyor.

12. The apparatus of claim 11 wherein said oxidizing material applying means includes a supply of the pressurized oxidizing material and a plurality of spray nozzles connected in communication with said supply and with said mixing chamber at a plurality of spaced locations between said transfer and deposit locations for receiving and spraying the pressurized oxidizing material in liquid form on the mixture of contaminated and absorbent materials.

13. The apparatus of claim wherein said aerating means includes a supply of compressed air and a plurality of air nozzles connected in communication with said air supply and with said mixing chamber at a plurality of spaced locations between said transfer and deposit locations for receiving and injecting air under pressure in the mixture of contaminated, absorbent and oxidizing materials.

14. An apparatus for remediating contaminated material, comprising:

(a) an elongated frame;

(b) means on said frame for continuously conveying contaminated material from a receiving location to a transfer location;

(c) means on said frame for holding a load of contaminated material and dispensing the material in a continuous flow at said receiving location;

(d) means on said frame for holding a load of an absorbent material and dispensing the material in a continuous flow on the contaminated material as the latter material is conveyed between said receiving and transfer locations;

(e) means on said frame for receiving the contaminated and absorbent materials at said transfer location and for concurrently mixing the materials together and transporting them from said transfer location to a deposit location;

(f) means on said frame for spraying an oxidizing material on the contaminated and absorbent materials at a first plurality of spaced locations between said transfer and deposit locations to produce mixing of the oxidizing material with the contaminated and absorbent materials as the latter are mixed together and transported from said transfer to deposit locations; and

(g) means on said frame for injecting oxygen containing gas the contaminated, absorbent and oxidizing materials at a second plurality of spaced locations between said transfer and deposit locations concurrently as the oxidizing material is sprayed thereon and the contaminated, absorbent and oxidizing materials are mixed together and transported from said transfer to deposit locations to produce a reaction therebetween which forms reaction by-products more environmentally acceptable than the contaminated material for discharge at said deposit location.

15. The apparatus of claim 14 further comprising:

means on said frame connected in communication with said mixing and transporting means for collecting any volatile reaction by-products to prevent release thereof to ambient atmosphere.

16. The apparatus of claim 15 wherein said transporting and mixing means includes an elongated mixing chamber, a combined mixing and conveying auger rotatably mounted therein and means for rotatably driving said combined mixer and conveyor.

17. The apparatus of claim 16 wherein said collecting means is at least one storage cannister connected in communication with said mixing chamber for receiving the volatile reaction by-products.

18. The apparatus of claim 14 wherein said contaminated material holding and dispensing means includes a main hopper disposed above said receiving location on said conveying means, and said absorbent material holding and dispensing means includes an auxiliary hopper disposed adjacent said main hopper and above said conveying means between said receiving and transfer locations thereon.

19. The apparatus of claim 14 wherein said conveying means includes a belt conveyor and means for supporting and driving said conveyor.

20. The apparatus of claim 14 wherein said transporting and mixing means includes an elongated mixing chamber, a combined mixing and conveying auger rotatably mounted therein and means for rotatably driving said combined mixer and conveyor.

21. The apparatus of claim 20 wherein said oxidizing material spraying means includes a supply of the pressurized oxidizing material and a plurality of spray nozzles connected in communication with said supply and with said mixing chamber at said first plurality of spaced locations between said transfer and deposit locations for receiving and spraying the pressurized oxidizing material in liquid form on the mixture of contaminated and absorbent materials.

22. The apparatus of claim 20 wherein said aerating means includes a supply of compressed air and a plurality of air nozzles connected in communication with said air supply and with said mixing chamber at said second plurality of spaced locations between said transfer and deposit locations for receiving and injecting air under pressure in the mixture of contaminated, absorbent and oxidizing materials.

23. A method for remediating contaminated material, comprising the steps of:

(a) conveying a contaminated material from a receiving location to a transfer location;

(b) dispensing an absorbent material on the contaminated material between the receiving and transfer locations;

(c) receiving the contaminated and absorbent materials at the transfer location and concurrently mixing the materials together and transporting them from the transfer location to a deposit location;

(d) applying an oxidizing material on the contaminated and absorbent materials between the transfer and deposit locations to produce mixing of the oxidizing material therewith between the transfer and deposit locations; and

(e) aerating the contaminated, absorbent and oxidizing materials between the transfer and deposit locations concurrently as the oxidizing material is being applied and the contaminated, absorbent and oxidizing materials are being mixed to produce a reaction therebetween and form reaction by-products which are more environmentally acceptable than the contaminated material for discharge at the deposit location.

24. The method of claim 23 further comprising the step of:

receiving and holding a load of contaminated material and dispensing the material in a continuous flow from the load thereof at the receiving location

25. The method of claim 23 wherein said conveying of contaminated material is continuous.

26. The method of claim 23 further comprising the step of:

receiving and holding a load of absorbent material and dispensing the material in a continuous flow from the load thereof between the receiving and transfer locations.

27. The method of claim 23 wherein said applying of oxidizing material is by spraying the oxidizing material in liquid form at a plurality of spaced locations between the transfer and deposit locations on the mixture of contaminated and absorbent materials.

28. The method of claim 23 wherein said aerating of the materials occurs at a plurality of spaced locations between the transfer and deposit locations and is by injecting of air under pressure.

29. The method of claim 23 further comprising the step of:

collecting any volatile reaction by-products to prevent release thereof to ambient atmosphere.

30. A method for remediating contaminated material, comprising the steps of:

(a) holding a load of contaminated material and dispensing the material in a continuous flow from the load thereof at the receiving location;

(b) receiving contaminated material in the continuous flow thereof at the receiving location and conveying the material from the receiving location to a transfer location;

(c) holding a load of absorbent material and dispensing the material in a continuous flow from the load thereof and onto the contaminated material being conveyed between the receiving and transfer locations;

(d) receiving the contaminated and absorbent materials at the transfer location and concurrently mixing the materials together and transporting them from the transfer location to a deposit location;

(e) spraying a liquid oxidizing material at a first plurality of spaced locations between the transfer and deposit locations onto the contaminated and absorbent materials to produce mixing of the oxidizing material therewith between the transfer and deposit locations; and

(f) aerating the contaminated, absorbent and oxidizing materials at a second plurality of spaced locations between the transfer and deposit locations by injecting air under pressure into the materials concurrently as the oxidizing material is being sprayed and the contaminated, absorbent and oxidizing materials are being mixed the produce a reaction therebetween and form reaction by-products which are more environmentally acceptable than the contaminated material for discharge at the deposit location.

31. The method of claim 30 further comprising the step of:

collecting any volatile reaction by-products to prevent release thereof to ambient atmosphere.