Method for reducing H2S contamination

• US 6,960,330 B1
• Filed: 07/11/2003
• Issued: 11/01/2005
• Est. Priority Date: 07/12/2002
• Status: Active Grant

• Current Assignee: Streamline Innovations, Inc.
• Original Assignee: Henry Wilmore Jr. Cox
• Inventors: Cox, Henry Wilmore Jr.
• Primary Examiner(s): Silverman, Stanley S.
• Assistant Examiner(s): Johnson, Edward M.
• Application Number:
  US10/617,513
• Time in Patent Office: 844 Days
• Field of Search: 423/200, 423/226, 423/228, 423/242.2, 423/242.3
• US Class Current: 423/226
• CPC Class Codes: A62D 2101/47 containing oxygen, sulfur, selenium or tellurium, i.e. chalcogen
• CPC Class Codes: A62D 3/38 by oxidation; by combustion
• CPC Class Codes: C02F 1/66 by neutralisation; pH adjustment for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58
• CPC Class Codes: C02F 1/683 by addition of complex-forming compounds
• CPC Class Codes: C02F 1/722 Oxidation by peroxides
• CPC Class Codes: C02F 1/725 by catalytic oxidation
• CPC Class Codes: C02F 2101/101 Sulfur compounds
• CPC Class Codes: C02F 2303/02 Odour removal or prevention of malodour
• CPC Class Codes: C02F 2305/026 Fenton's reagent
• CPC Class Codes: C02F 2307/08 Treatment of wastewater in the sewer, e.g. to reduce grease, odour
• CPC Class Codes: Y02W 10/37 using solar energy

Abstract

Certain exemplary compositions, methods, and systems are disclosed that can be useful for reducing a concentration of a contaminant associated with a medium, which can be any substance or material, such as soil, water, air, and/or fluid. In one exemplary method, the medium is treated with Fe-MGDA and an oxidizing agent in amounts effective to oxidize at least a portion of the contaminant. It is emphasized that this abstract is provided to comply with the rules requiring an abstract that will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure.

Claims

1. A method of reducing hydrogen sulfide content in a medium, comprising:

adding Fe-MGDA and a peroxide to a medium with a hydrogen sulfide content; and

reducing the hydrogen sulfide content in the medium.

2. The method of claim 1, wherein the hydrogen sulfide content is lowered though an oxidation reaction.

3. The method of claim 1, further comprising reducing the hydrogen sulfide content to a non-detectable amount.

4. The method of claim 1, further comprising reducing odors caused by hydrogen sulfide.

5. The method of claim 1, further comprising preparing the Fe-MGDA.

6. The method of claim 1, further comprising contacting iron and MGDA to form Fe-MGDA.

7. The method of claim 1, further comprising contacting Fe-MGDA and the peroxide to form a reaction product.

8. The method of claim 1, further comprising contacting Fe-MGDA and the peroxide to form an oxidizing agent.

9. The method of claim 1, further comprising mixing Fe-MGDA and the peroxide prior to adding to the medium containing hydrogen sulfide.

10. The method of claim 1, further comprising mixing Fe-MGDA and the peroxide after addition to the medium containing hydrogen sulfide.

11. The method of claim 1, further comprising adding Fe-MGDA and the peroxide simultaneously to the medium containing hydrogen sulfide.

12. The method of claim 1, further comprising adding Fe-MGDA and the peroxide sequentially to the medium containing hydrogen sulfide.

13. The method of claim 1, further comprising conveying a mixture of the Fe-MGDA and peroxide to the medium containing hydrogen sulfide.

14. The method of claim 1, further comprising dispersing a mixture of Fe-MGDA and the peroxide in liquid form.

15. The method of claim 1, further comprising dispersing a mixture of Fe-MGDA and the peroxide in foam form.

16. The method of claim 1, further comprising dispersing a mixture of Fe-MGDA and the peroxide in solid form.

17. The method of claim 1, further comprising dispersing a mixture of Fe-MGDA and the peroxide in gaseous form.

18. The method of claim 1, further comprising dispersing a mixture of Fe-MGDA and the peroxide in aerosol form.

19. The method of claim 1, further comprising dispersing a mixture of Fe-MGDA and the peroxide in vapor form.

20. The method of claim 1, further comprising determining an optimal dose rate for the Fe-MGDA added to the medium.

21. The method of claim 1, further comprising determining an optimal pH for removing hydrogen sulfide from the medium.

22. The method of claim 1, wherein the pH for reducing the hydrogen sulfide content is between approximately 5 and approximately 9.6.

23. The method of claim 1, further comprising determining an optimal dose rate for the peroxide added to the medium.

24. The method of claim 1, further comprising conveying the medium after treatment with Fe-MGDA and the peroxide.

25. The method of claim 1, further comprising discharging the medium after treatment with Fe-MGDA and the peroxide.

26. The method of claim 1, further comprising measuring the levels of hydrogen sulfide before treatment with Fe-MGDA and the peroxide.

27. The method of claim 1, further comprising measuring the levels of hydrogen sulfide after treatment with Fe-MGDA and the peroxide.

28. The method of claim 1, further comprising determining a reduction in hydrogen sulfide associated with the medium.

29. The method of claim 1, further comprising reducing hydrogen sulfide concentration in the medium to less than approximately 50 parts per million.

30. The method of claim 1, further comprising reducing hydrogen sulfide concentration in the medium to less than approximately 20 parts per million.

31. The method of claim 1, further comprising reducing hydrogen sulfide concentration in the medium to less than approximately 10 parts per million.

32. The method of claim 1, further comprising reducing hydrogen sulfide concentration in the medium to less than approximately 5 parts per million.

33. The method of claim 1, further comprising reducing hydrogen sulfide concentration in the medium to less than approximately 1 part per million.

34. The method of claim 1, further comprising reducing hydrogen sulfide concentration in the medium to approximately non-detectable levels.

35. The method of claim 1, wherein the medium containing hydrogen sulfide is selected from:

liquid, water, groundwater, leachate, wastewater, sewer water, blackwater, graywater, bilge water, ballast water, feed water, process water, industrial water, irrigation water, recreational water, pond water, lake water, creek water, river water, rain water, runoff water, pool water, cooling water, non-potable water, potable water, drinking water, semi-pure water, spent ultra-pure water, sour water, waste stream water.

36. The method of claim 1, wherein the medium is selected from:

a solid, solids, biosolids, rubbish, trash, refuse, waste, medical waste, radioactive waste, sweepings, scourings, rubble, debris, detritus, scum, grease, sludge, sewage, jetsam, flotsam, soil, clay, dust, sand, gravel, stones, rock, sediment, activated charcoal, paint, chemical mixture.

37. The method of claim 1, wherein the medium containing the hydrogen sulfide is a vapor.

38. The method of claim 1, wherein the medium containing the hydrogen sulfide is a liquid.

39. The method of claim 1, wherein the medium containing the hydrogen sulfide is a slurry.

40. A method for removing hydrogen sulfide from a medium, comprising contacting the medium with a reaction product of Fe-MGDA and a peroxide.

41. A method of degrading hydrogen sulfide comprising:

contacting a medium containing hydrogen sulfide with a reaction product of Fe-MGDA and a peroxide; and

oxidizing the hydrogen sulfide.

42. A method of degrading hydrogen sulfide comprising:

contacting a medium containing hydrogen sulfide with a reaction product of Fe-MGDA and a peroxide; and

oxidizing the hydrogen sulfide.

43. The method of claim 42, wherein the reaction product is an oxidizing agent.

44. A method for reducing a concentration of a contaminant associated with a medium, comprising:

treating the medium with Fe-MGDA and an oxidizing agent; and

reducing an odor produced by the contaminant.

45. A method for treating sewers, comprising:

adding Fe-MGDa and a peroxide to a medium within a sewer; and

reducing the content of a contaminant within the medium.

46. The method of claim 45, wherein at least one of the Fe-MGDA and the peroxide are in a vapor form.

47. The method of claim 45, wherein at least one of the Fe-MGDA and the peroxide are in a liquid form.

48. The method of claim 45, wherein the contaminant is in a vapor form.

49. The method of claim 45, wherein the contaminant is in a liquid form.

50. The method of claim 45, wherein the contaminant is in solid form.

51. The method of claim 45, wherein the Fe-MGDA is added at a constant rate.

52. The method of claim 45, wherein the FE-MGDA is added at a variable rate.

53. The method of claim 45, wherein the FE-MGDA is added intermittently.

54. The method of claim 45, wherein the peroxide is added at a constant rate.

55. The method of claim 45, wherein the peroxide is added at a variable rate.

56. The method of claim 45, wherein the peroxide is added intermittently.