Methods for reducing and separating emulsions and homogeneous components from contaminated water

• US 5,411,665 A
• Filed: 07/20/1993
• Issued: 05/02/1995
• Est. Priority Date: 07/20/1993
• Status: Expired due to Term

• Current Assignee: Alonzo L. Decell, Charles R. Scraggs, Jack R. Creel
• Original Assignee: Alonzo L. Decell, Charles R. Scraggs, Jack R. Creel
• Inventors: Scraggs, Charles R., Creel, Jack R., DeCell, Alonzo L.
• Primary Examiner(s): WYSE, THOMAS G
• Application Number:
  US08/094,684
• Time in Patent Office: 651 Days
• Field of Search: 210/610, 210/611, 210/620, 210/631, 210/708, 210/799, 210/802, 210/DIG. 5
• US Class Current: 210/610
• 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 17/0208 by sedimentation
• CPC Class Codes: B01D 17/0211 with baffles
• CPC Class Codes: B01D 17/08 Thickening liquid suspensions by filtration
• CPC Class Codes: B01D 17/12 Auxiliary equipment particularly adapted for use with liquid-separating apparatus, e.g. control circuits
• CPC Class Codes: C02F 2103/44 from vehicle washing facilities
• CPC Class Codes: C02F 3/343 for digestion of grease, fat, oil
• CPC Class Codes: Y10S 210/05 Coalescer

Abstract

A system for the reduction and separation of highly emulsified and/or immiscible components mixed in a fluid, particularly useful for treating waste water contaminated with oils and oily emulsions, as from depleted oil wells, vehicle washing stations, and meat rendering plants. The system is operative for reducing the amount of organic and inorganic contaminants, and is particularly suitable for reducing the amount of oil, with oil-consuming microorganisms, and separating oil that is not consumed within the system from the water so that the oil may be recycled and the water discharged into wetlands or sanitary sewers without further treatment. The system comprises a multi-stage, recirculating series of treatment tanks. In a first stage, the fluid is recirculated through a treatment loop where the fluid is aerated and then passed through a coalescer. Organic metabolizing microorganisms that contribute to de-emulsification and contaminant reduction within the system are introduced, together with a superoxygenated catalyst containing microorganism nutrients. The coalescer is preferably a horizontal stack of evenly spaced apart polypropylene plates with sinusoidal corrugations running along the plane of the plates. In subsequent treatment stages, the fluid is recirculated through filters prior to discharge from the system.

Claims

1. A method of separating highly emulsified and/or immiscible components mixed in a fluid, which comprises the steps of:

(a) providing a coalescer comprising a plurality of spaced apart plates, each plate having corrugations running along the plate forming crests and valleys, said plate having bleed holes for passage of the immiscible components;

(b) adding oil metabolizing microorganisms to the fluid to break the emulsion; and

(c) passing the fluid through the coalescer to separate the immiscible constituents of the waste stream.

2. The method of claim 1, further comprising the step of adding a microorganism catalyst.

3. The method of claim 1, further comprising the step of aerating the fluid.

4. The method of claim 1, further comprising the step of filtering the fluid after the fluid has passed through the coalescer.

5. The method of claim 4, wherein the filter comprises a filtration media selected from the group consisting of sand, silica, and activated carbon.

6. The method of claim 4, further comprising the step of recirculating the fluid through the filter.

7. The method of claim 1, wherein the plates are arranged horizontally.

8. The method of claim 1, wherein the corrugations of the plates are approximately sinusoidal.

9. The method of claim 1, wherein the plates are polypropylene.

10. The method of claim 1, further comprising the step of recirculating the fluid through the coalescer.

11. The method of claim 1, wherein the fluid is introduced into a first treatment tank, and further comprising the steps of:

accumulating fluid in the first treatment tank, and

transferring the fluid into the coalescer.

12. The method of claim 11, wherein the coalescer is mounted above the first treatment tank, and further comprising the step of directing the outflow of the coalescer back into the first treatment tank for recirculation.

13. The method of claim 12, further comprising the steps of:

accumulating fluid in the first treatment tank from introduction of new fluid for treatment and from outflow from the coalescer, and

when the level of fluid in the first treatment tank reaches a predetermined level, transferring fluid that has been separated from immiscible components into a second treatment tank.

14. The method of claim 13, further comprising the steps of:

accumulating separated fluid in the second treatment tank;

when the level of fluid in the second treatment tank reaches a second predetermined level, transferring the fluid to a third treatment tank.

15. The method of claim 14, further comprising the step of filtering the fluid as it is transferred from the second treatment tank to the third treatment tank.

16. The method of claim 15, further comprising the steps of:

accumulating fluid in the third treatment tank; and

when the level of fluid in the third treatment tank reaches a third predetermined level, recirculating the fluid back into the second treatment tank.

17. The method of claim 16, further comprising the steps of:

accumulating fluid in the third treatment tank and the second treatment tank; and

when the level of fluid in both the second treatment tank and the third treatment tank reaches a fourth predetermined level, transferring fluid to a fourth treatment tank.

18. The method of claim 17, further comprising the steps of:

accumulating fluid in the fourth treatment tank;

when the level of fluid in the fourth treatment tank reaches a fifth predetermined level, transferring treated fluid from the fourth treatment tank.

19. The method of claim 18, further comprising the step of filtering the treated fluid as it is transferred from the fourth treatment tank.

20. The method of claim 1, further comprising the step of skimming the immiscible component from the fluid in proximity to the coalescer.

21. The method of claim 20, wherein the skimming is effected prior to and subsequent to the coalescer.

27. The method of claim 20, wherein the skimming is effected prior to and subsequent to the coalescer.

22. A method of separating immiscible components mixed in a fluid, which comprises the steps of:

(a) aerating the fluid;

(b) adding oil metabolizing microorganisms to the fluid;

(c) providing a coalescer which comprises a plurality of horizontal, spaced apart plates, each plate having corrugations running along the plate forming crests and valleys, said plate having bleed holes for passage of the immiscible components;

(d) passing the fluid at least once through the coalescer; and

(e) subsequently filtering the fluid through a filtration media.

23. The method of claim 22, further comprising the step of adding a catalyst for the microorganisms.

24. The method of claim 22, wherein the plates are polypropylene.

25. The method of claim 22, wherein the corrugations of the polypropylene plates are approximately sinusoidal.

26. The method of claim 22, further comprising the step of skimming the immiscible component from the fluid in proximity to the coalescer.

28. The method of claim 26, further comprising the step of reintroducing the immiscible components back into the fluid.

29. The method of claim 22, further comprising the step of maintaining the temperature of the fluid within a range that is conducive to the activity of the microorganisms.

30. A method of separating highly emulsified and/or immiscible components mixed in a fluid, which comprises the steps of:

(a) introducing fluid to be cleaned into a first treatment tank;

(b) providing a coalescer;

(c) prior to filtering the fluid, moving the fluid from the first treatment tank through the coalescer;

(d) removing cleaned fluid from the coalescer;

(e) removing the immiscible component from the fluid proximal to coalescer.

(f) filtering the cleaned fluid removed from the coalescer; and

(g) recirculating the cleaned fluid through a prior treatment stage.

31. The method of claim 30, wherein the steps of filtering and recirculating comprise:

accumulating cleaned fluid from the coalescer in a second treatment tank;

moving cleaned fluid from the second treatment tank to a third treatment tank;

during the step of moving the fluid from the second treatment tank to the third treatment tank, filtering the fluid.

32. The method of claim 31, further comprising the steps of:

accumulating the filtered fluid in the third treatment tank;

when the fluid in the third treatment tank reaches a predetermined level, transferring the fluid back into the second treatment tank for subsequent refiltering.

33. The method of claim 30, further comprising the step of adding oil metabolizing microorganisms.

34. The method of claim 33, further comprising the step of adding a microorganism catalyst.

35. The method of claim 30, further comprising the step of aerating the fluid.

36. The method of claim 30, wherein the step of filtering comprises moving the fluid through a filtration media selected from the group consisting of sand, silica, and activated carbon.

37. The method of claim 30, wherein the coalescer comprises a material selected from the group consisting of polypropylene, polynylon, polyester, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, polyacrylic, polyurethane, and metal.

38. The method of claim 30, wherein the coalescer comprises a plurality of spaced apart plates, each plate having corrugations forming crests and valleys.

39. The method of claim 38, wherein the coalescer comprises a plurality of spaced apart polypropylene plates, each plate having bi-directional corrugations running both laterally and longitudinally along the plane of the plate forming crests and valleys, the crests and valleys including bleed holes for passage of the immiscible components.

40. The method of claim 38, wherein the plates are arranged horizontally.

41. The method of claim 30, wherein the fluid is recirculated through the coalescer before the step of filtering.

42. The method of claim 30, wherein the coalescer comprises a horizontal flow coalescer.

43. The method of claim 30, wherein the step of removing the immiscible component comprises skimming the immiscible component from the fluid.

44. The method of claim 43, wherein the skimming is effected prior to and subsequent to the coalescer.

52. The method of claim 39, wherein the coalescer comprises a material selected from the group consisting of polypropylene, polynylon, polyester, polyvinyl chloride, polyvinylidene chloride, polytetrafluoroethylene, polyacrylic, polyurethane, and metal.

53. The method of claim 39, wherein the coalescer comprises a plurality of corrugated plates.

54. The method of claim 53 wherein the corrugated plates comprise a plurality of polyethylene sinusoidal plates.

45. A method of separating highly emulsified and/or immiscible components mixed in a fluid, which comprises the steps of:

(a) introducing uncleaned fluid into a first treatment tank;

(b) aerating the fluid;

(c) adding oil metabolizing microorganisms to the fluid;

(d) providing a coalescer;

(e) passing the fluid through the coalescer at least once prior to filtration of the fluid;

(f) removing partially cleaned fluid from the coalescer into a second treatment tank;

(g) accumulating partially cleaned fluid in the second treatment tank;

(h) removing fluid from the second treatment tank;

(i) filtering the fluid; and

(j) discharging the filtered fluid.

46. The method of claim 45, wherein the step of passing the fluid through the coalescer at least once comprises:

moving fluid from the first treatment tank to the coalescer;

passing the fluid through the coalescer;

discharging the fluid back into the first treatment tank;

continuing to introduce additional uncleaned fluid into the first treatment tank to dilute the uncleaned fluid with partially cleaned fluid;

when the level in the first treatment tank reaches a first predetermined level, removing relatively cleaned fluid from a region proximate to the coalescer to the second treatment tank.

47. The method of claim 45, wherein the step of filtering the fluid comprising passing the fluid through a filtration media selected from the group consisting of sand, silica, and activated carbon.

48. The method of claim 45, further comprising the step of repeatedly filtering the fluid prior to discharging the fluid.

49. The method of claim 48, wherein the step of repeatedly filtering the fluid comprises:

accumulating discharged filtered fluid in a third treatment tank;

when the fluid in the third treatment tank reaches a second predetermined level, returning the fluid back into the second treatment tank for subsequent filtering.

50. The method of claim 49, further comprising the step of:

accumulating the filtered fluid in the second treatment tank and the third treatment tank as the fluid is refiltered and as new partially cleaned fluid is introduced from the coalescer;

when the fluid in the second and third treatment tanks reaches a third predetermined level, removing the fluid to a fourth treatment tank.

51. The method of claim 50, further comprising the step of filtering the fluid through a second filter after discharging the fluid from the fourth treatment tank.

55. The method of claim 45, further comprising the step of skimming the immiscible component from the fluid in proximity to the coalescer.

56. The method of claim 55, wherein the skimming is effected prior to and subsequent to the coalescer.