Waste water treatment process

• US 7,481,935 B2
• Filed: 10/04/2004
• Issued: 01/27/2009
• Est. Priority Date: 10/03/2003
• Status: Active Grant

• Current Assignee: Scientific Associates, LLC
• Original Assignee: Scientific Associates, LLC
• Inventors: Olivier, Laurent
• Primary Examiner(s): Barry; Chester T
• Application Number:
  US10/956,041
• Publication Number:
  US 20050109697A1
• Time in Patent Office: 1,576 Days
• Field of Search: 210620-631
• US Class Current: 210/620
• CPC Class Codes: C02F 1/32 with ultraviolet light
• CPC Class Codes: C02F 1/4618 for producing "ionised" acidic or basic water
• CPC Class Codes: C02F 1/4672 by electrooxydation
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: C02F 2103/20 from animal husbandry
• CPC Class Codes: C02F 3/00 Biological treatment of water, waste water, or sewage C02F1/006 takes precedence
• CPC Class Codes: C02F 3/06 using submerged filters
• CPC Class Codes: C02F 3/302 Nitrification and denitrification treatment C02F3/308 takes precedence
• CPC Class Codes: C02F 3/34 characterised by the microorganisms used
• CPC Class Codes: Y02W 10/10 Biological treatment of water, waste water, or sewage
• CPC Class Codes: Y02W 10/37 using solar energy
• CPC Class Codes: Y02W 30/40 Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

Abstract

The present invention describes improved methods and systems for treating waste water and solid waste, which may include the addition of catholyte and anolyte. The methods and systems of the present invention may be used to treat waste water and solid waste from animal farms, such as for example, hog farms, dairy farms, and cattle and sheep ranches. The methods and systems of the present invention may also be used to treat waste water from other sources, such as human waste or farm runoff from irrigation.

Claims

1. A process for treating waste from an animal farm including a waste retainer for collecting the wastes of animals, the process comprising:

applying water and anolyte to the waste retainer to clean waste away from the waste retainer and thereby create a waste water;

flowing the waste water from the retainer to a separation system for separating at least some of the solid waste from the waste water;

flowing the waste water from the separation system to a system for introducing gas bubbles into the waste water to separate contaminants from the waste water and to increase the level of dissolved oxygen in the waste water;

applying aerobic bacteria to the waste water to reduce ammonia to nitrate in the waste water;

flowing at least a portion of the waste water to a denitration system to reduce nitrate levels in the waste water; and

flowing the water to a retention tank.

2. The process of claim 1 wherein at least a substantial portion of the water applied to the waste retainer is the water treated by the treatment steps of claim 1.

3. The process of claim 1 wherein anolyte is sprayed onto animal waste in the waste retainer.

4. The process of claim 3 where anolyte is sprayed in the air in the environment proximate to the waste retainer.

5. The process of claim 1 wherein the waste water is held in a lagoon for a period of time.

6. The process of claim 1 wherein the waste water is held in a closed container for a period of time.

7. The process of claim 1 further comprising the step of automatically applying the water and anolyte to the waste retainer at periodic intervals.

8. The process of claim 7 wherein the water and anolyte are applied at least three times per hour.

9. The process of claim 7 wherein the water and anolyte are applied at least once every four hours.

10. The process of claim 7 wherein the application of water and anolyte is controlled by a timer and at least one sensor that measures the level or flow of waste water.

11. The process of claim 1 wherein the separation system includes a mixing tank equipped with an apparatus for mixing the fluid and materials in the tank.

12. The process of claim 11 comprising the additional step of adding an oxygen-containing gas into the mixing tank.

13. The process of claim 1 further comprising at least one pump for effecting a forced flow of water and waste water.

14. The process of claim 13 wherein the pump is a screw pump.

15. The process of claim 14 wherein the flow of waste water created by the pump is about 0.15 to 3.0 L/kg Animal/hour.

16. The process of claim 1 wherein the separation system further comprises a tank containing a mechanism for separating solids and liquids.

17. The process of claim 16 wherein the mechanism for separating solids and liquids is selected from the group consisting of:

a gravity screen, a disk screen, a drum, a belt, a screw press screen, or a filter system.

18. A process for treating waste from an animal farm including a waste retainer for collecting the wastes of animals, the process comprising:

applying water to the waste retainer to clean waste away from the waste retainer and thereby create a waste water;

adding catholyte to the waste water;

flowing the waste water from the retainer to a separation system for separating at least some of the solid waste from the waste water;

flowing the waste water from the separation system to a system for introducing gas bubbles into the waste water to separate contaminants from the waste water and to increase the level of dissolved oxygen in the waste water;

applying aerobic bacteria to the waste water to reduce ammonia to nitrate in the waste water;

flowing at least a portion of the waste water to a denitration system to reduce nitrate levels in the waste water; and

flowing the water to a retention tank.

19. The process of claim 18 wherein the amount of catholyte added ranges from about 1 to about 30 percent of the volume of water applied to the waste retainer.

20. The process of claim 18 wherein the system for introducing gas bubbles comprises a first chamber for holding the waste water, and at least one jet mixer to mix an oxygen-containing gas with the waste water.

21. The process of claim 20 wherein the system for introducing gas bubbles further comprises a collector plate to collect contaminants that accumulate within the apparatus in the form of foam.

22. The process of claim 20 wherein the oxygen-containing gas is ozone.

23. The process of claim 20 wherein the jet mixer is a mixing eductor comprising an inlet channel for introducing a forced flow of water, a mixing channel connected to the inlet channel and defining a flow path for entraining water from within the chamber, and tubing, connected to the mixing channel, and adapted to accept the flow of an oxygen-containing gas or a liquid, the mixing eductor in operation mixing the forced flow of water, the entrained water, and the gas or liquid within the chamber.

24. The process of claim 23 wherein the mixing eductor tubing comprises two sections of tube such that the first can accept the flow of an oxygen-containing gas and the second can accept the flow of a liquid.

25. The process of claim 24 wherein the liquid is catholyte.

26. The process of claim 23 wherein the mixing eductor tubing comprises a single tube section that can accept the flow of both an oxygen-containing gas and a liquid.

27. The process of claim 26 wherein the liquid is catholyte.

28. The process of claim 18 wherein the step for applying aerobic bacteria occurs in a chamber containing a media which supports aerobic bacteria and an apparatus for mixing a liquid or a gas with the waste water in the chamber.

29. The process of claim 28 further comprising the step of adding an oxygen-containing gas into the chamber to improve the efficiency of the aerobic bacteria process.

30. The process of claim 29 wherein the catholyte is added to the waste water inside the chamber.

31. The process of claim 30 wherein the amount of catholyte added ranges from about 1 to about 20 percent of the volume of water inside the chamber.

32. The process of claim 28 wherein the aerobic bacteria comprise at least one bacteria chosen from nitrosomonas and nitrobacter bacteria.

33. The process of claim 18 wherein the denitration system for maintaining nitrate levels in the waste water comprises an apparatus for substantially reducing the oxygen concentration of the waste water and an apparatus containing anaerobic bacteria for substantially reducing the level of nitrates in the water.

34. The process of claim 33 wherein the apparatus for substantially reducing the oxygen concentration of the waste water comprises a chamber containing a media supporting sufficient aerobic bacteria to substantially reduce the oxygen content in the water as the water flows through the chamber.

35. The process of claim 34 wherein the chamber reduces the oxygen content of the water to a level of less than 5 ppm.

36. The process of claim 34 wherein the catholyte is added to the chamber.

37. The process of claim 36 wherein the amount of catholyte added ranges from about 1 to about 20 percent of the volume of water in the chamber.

38. The process of claim 33 wherein the apparatus containing anaerobic bacteria comprises a chamber containing a media of sulfur which supports sufficient anaerobic bacteria to substantially reduce the nitrate content in the water, as the water flows through the chamber.

39. The process of claim 38 wherein the anaerobic bacteria comprise Thiobadllus denitrificans bacteria.

40. The process of claim 38 wherein the aerobic bacteria comprise at least one bacteria chosen from nitrosomonas and nitrobacter bacteria.

41. The process of claim 38 wherein the anaerobic bacteria comprise at least one bacteria chosen from Thiobacillus denitrificans, Thobacillus versutus, Thiobacillus thyasiris, Thiosphaera pantotropha, Paracoccus denitrificans, and Thiomicrospira denitrificans.

42. The process of claim 18 further comprising the additional step of flowing the water to an oxytower apparatus comprising an enclosure for accepting a flow of water, the enclosure having side walls that slope inward at an angle θ

_oxy from vertical, having a medium that is placed on the inner surface of the enclosure that serves as a support for the growth of algae, such that the water flows down the walls of the enclosure and contacts the algae in a manner which allows the algae to effectively remove contaminants from the water and raise the pH of the water.

43. The process of claim 42 wherein the catholyte is added to the oxytower apparatus.

44. The process of claim 43 wherein the amount of catholyte added ranges from about 1 to about 20 percent of the volume of water flowing through the oxytower.

58. The process of claim 18 wherein the separation system includes a mixing tank equipped with an apparatus for mixing the fluid and materials in the tank.

59. The process of claim 58 comprising the additional step of adding an oxygen-containing gas into the mixing tank.

60. The process of claim 59 further comprising the step of adding the catholyte into the mixing tank.

61. The process of claim 60 wherein the amount of catholyte added to the mixing tank ranges from about 1 to about 30 percent of the volume of water in the mixing tank.

45. A process for treating waste water containing solid waste and other impurities, comprising:

adding catholyte to the waste water;

introducing the waste water into a solid/liquid separation system for separating at least a portion of the solid waste from the waste water to form waste water having a reduced solids content;

flowing the waste water having a reduced solids content to a first holding area;

removing a first waste product from the waste water in the form of a foam by introducing gas comprising oxygen into the waste water in the holding area to form bubbles in the waste water, wherein the bubbles collect the first waste product from the water and rise to the surface of the waste water in the tank to form the foam; and

removing a second waste product from the waste water by allowing the second waste product to sink to the bottom of the tank where it is collected and later removed.

46. The process of claim 45 wherein the gas is introduced by at least one mixing eductor having a mixing channel, wherein the waste water and the gas comprising oxygen are first mixed inside the mixing channel and then flowed from the mixing channel in a circular direction.

47. The process of claim 45 wherein the oxygen-containing gas is chosen from air, oxygen and ozone.

48. The process of claim 45, wherein the catholyte is introduced into the solid/liquid separation system.

49. The process of claim 45, further comprising the step of flowing waste water from the solid/liquid separation system to a bio-filter having a chamber containing a media supporting aerobic bacteria.

50. The process of claim 49, wherein the bio-filter contains a mixing eductor and wherein a gas comprising oxygen is introduced into the bio-filter through the mixing eductor.

51. The process of claim 50, wherein the catholyte is introduced into the bio-filter.

52. The process of claim 49, further comprising the step of flowing the waste water from the bio-filter to a denitration system containing a media supporting anaerobic bacteria which remove nitrate from the waste water.

53. The process of claim 52, wherein the catholyte is introduced into the denitration chamber.

54. The process of claim 49, further comprising the step of flowing the water to an oxytower having a medium supporting algae, wherein the water is flowed over the surface of the algae.

55. A process for treating solid waste removed from waste water runoff from an animal farm, comprising adding anolyte to the solid waste.

56. A process for reducing odors and bacteria in an animal enclosure, comprising the step of treating the animal enclosure with anolyte.

57. A process for safely forming fertilizer from the solid waste of animals comprising:

mixing solid waste with catholyte to encourage rapid decomposition;

applying anolyte to the exterior of the waste; and

allowing the waste mixture to decompose for a sufficient amount of time to remove the harmful ammonia from the waste.