Removing contaminants from groundwater

• US 20020162805A1
• Filed: 02/27/2001
• Published: 11/07/2002
• Est. Priority Date: 02/27/2001
• Status: Abandoned Application

• Current Assignee: Calclean, Inc.
• Original Assignee: Calclean, Inc.
• Inventors: Shenoi, Noel A.
• Application Number:
  US09/797,287
• Publication Number:
  US 20020162805A1
• Time in Patent Office: Days
• US Class Current: 210/774
• CPC Class Codes: C02F 1/02 by heating methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D
• CPC Class Codes: C02F 1/20 by degassing, i.e. liberation of dissolved gases degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D
• CPC Class Codes: C02F 1/283 using coal, charred products, or inorganic mixtures containing them
• CPC Class Codes: C02F 2101/322 Volatile compounds, e.g. benzene
• CPC Class Codes: C02F 2103/06 Contaminated groundwater or leachate
• CPC Class Codes: C02F 2201/008 Mobile apparatus and plants, e.g. mounted on a vehicle
• CPC Class Codes: C02F 2301/063 Underpressure, vacuum

Abstract

A method and apparatus for removing hydrocarbon contaminants from groundwater. The apparatus preferably removes contaminants from groundwater by heating the groundwater to a temperature at which the contaminant vaporizes and separates from the liquid groundwater. Sparge air may be passed through the groundwater to assist in separating the vaporized contaminant. Further, a vacuum may be applied to lower the vaporization temperature of the contaminant. The extracted hydrocarbons are preferably destroyed in a thermal or catalytic oxidizer while the groundwater with the vaporized contaminant removed is preferably pumped through activated carbon filters to further reduce the amount of contaminants to governmental standards.

Claims

1. A method for removing contaminant from groundwater, the method comprising the steps of:

(a) extracting groundwater including contaminate from the ground;

(b) placing the extracted groundwater into a tank;

(c) applying a vacuum to the tank;

(d) heating the extracted groundwater to a temperature at which at least a portion of the contaminant vaporizes and separates from the extracted groundwater, thereby forming cleaned water;

(e) removing the vaporized contaminant from the tank; and

(f) removing the cleaned water from the tank.

2. A method for removing a contaminant from groundwater, the method comprising:

(a) placing groundwater containing the contaminant into a tank; and

(b) heating the groundwater in the tank to a temperature at which at least a portion of the contaminant vaporizes and separates from the groundwater, thereby forming cleaned water.

3. The method of claim 2 wherein the contaminant comprises MTBE.

4. The method of claim 2 that further includes the step of burning the separated vaporized contaminant.

5. The method of claim 2 that further includes the step of passing the cleaned water through a filter to remove additional contaminant.

6. The method of claim 2 that further includes the step of agitating the ground water to assist in separating the contaminant.

7. The method of claim 6 wherein the ground water is agitated by passing a gas through it to assist in separating the contaminant.

8. The method of claim 7 wherein the gas is air.

9. The method claim 2 that further comprises the step of applying a vacuum to the tank and vaporizing the contaminant in the presence of the vacuum.

10. The method of claim 9 wherein the temperature is 60°

F. to 200°

F.

11. The method of claim 4 wherein the vaporized contaminant is removed from the tank before burning.

12. The method of claim 5 wherein the filter is an activated carbon filter.

13. The method of claim 12 wherein the carbon filter is one or more carbon tanks containing activated carbon.

14. The method of claim 2 that further comprises the step of extracting groundwater from the ground.

15. The method of claim 14 wherein the groundwater is extracted from the ground by vacuum.

16. The method of claim 2 wherein the groundwater is placed into the tank on site.

17. The method of claim 14 wherein the groundwater is placed into the tank on site.

18. The method of claim 2 wherein the groundwater is heated on site and the contaminant vaporizes and separates on site.

19. The method of claim 4 wherein the vaporized contaminant is burned on site.

20. The method of claim 5 wherein the cleaned water is passed through the filter on site.

21. The method of claim 20 wherein the cleaned water has a level of contaminants at or below government standards after being passed through the filter.

28. The method of claim 2, wherein the tank is disposed on a mobile vehicle.

22. A method for removing a contaminant from groundwater comprising the steps of:

(a) applying a vacuum to groundwater containing the contaminant to create a pressure at which the contaminant vaporizes and separates from the groundwater; and

(b) agitating the groundwater to assist in separating the contaminant.

24. The device of claim 23 that further includes a vacuum source connected to the tank.

25. The device of claim 23 that further includes a carbon filter connected to the second end of the third conduit for transferring cleaned water out of the tank.

26. The device of claim 27 wherein the carbon filter comprises one or more carbon tanks.

27. The device of claim 23 further comprising a vehicle having the tank mounted thereon.

23. A device for use in separating a contaminant from contaminated water, the device comprising:

(a) a tank comprising an agitator and a heating element;

(b) a first conduit for transferring the contaminated water to the tank, the first conduit having a first end and a second end, the first end of the first conduit being connected to the tank;

(c) a second conduit for transferring vaporized contaminant out of the tank; and

(d) a third conduit for transferring cleaned water out of the tank, the third conduit having a first end and a second end, the first end of the third conduit being connected to the tank.

29. A method for removing a contaminant from water comprising:

(a) placing water containing the contaminant into a tank; and

(b) heating the water in the tank to a temperature at which at least a portion the contaminant vaporizes and separates from the water, thereby forming cleaned water.