Methods for managing sulfide in wastewater systems

• US 8,609,926 B1
• Filed: 04/19/2010
• Issued: 12/17/2013
• Est. Priority Date: 11/21/2006
• Status: Active Grant

• Current Assignee: Streamline Innovations, Inc.
• Original Assignee: Henry Wilmore Jr. Cox
• Inventors: Cox, Henry Wilmore Jr.
• Primary Examiner(s): JOHNSON, EDWARD M
• Application Number:
  US12/762,415
• Time in Patent Office: 1,338 Days
• Field of Search: 423/244.01, 588/320, 588/405
• US Class Current: 588/320
• CPC Class Codes: C02F 1/683 by addition of complex-forming compounds
• CPC Class Codes: C02F 1/72 by oxidation C02F1/4672 takes precedence
• CPC Class Codes: C02F 1/725 by catalytic oxidation
• CPC Class Codes: C02F 1/727 using pure oxygen or oxygen rich gas
• CPC Class Codes: C02F 1/74 with air aeration of stretches of water C02F7/00
• CPC Class Codes: C02F 2101/101 Sulfur compounds
• CPC Class Codes: C02F 2209/006 comprising a software program or a logic diagram
• CPC Class Codes: C02F 2209/06 pH
• CPC Class Codes: C02F 2209/15 N03-N
• CPC Class Codes: C02F 2209/26 H2S
• CPC Class Codes: C02F 2209/265 in the gas phase
• CPC Class Codes: C02F 2305/02 Specific form of oxidant
• 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: C02F 3/30 Aerobic and anaerobic processes
• CPC Class Codes: C02F 3/301 Aerobic and anaerobic treatment in the same reactor
• CPC Class Codes: C02F 3/345 for biological oxidation or reduction of sulfur compounds

Abstract

Certain exemplary embodiments can provide a system, machine, device, manufacture, circuit, composition, and/or user interface adapted for and/or resulting from, and/or a method and/or machine-readable medium comprising machine-implementable instructions for, activities that can comprise and/or relate to, in a treatment zone, reacting an oxygen-comprising gas, one or more selected ferric/ferrous chelates, one or more selected nitrates and/or nitrites, and/or anaerobic wastewater.

Claims

1. A method comprising:

in a treatment zone of a manmade container, reacting an oxygen-comprising gas, one or more selected ferric/ferrous chelates, one or more selected nitrates and/or nitrites, and anaerobic wastewater, wherein a mass-to-mass ratio of oxygen in said oxygen-comprising gas when entering said treatment zone to available sulfide in said anaerobic wastewater when entering said treatment zone is at least approximately 1.5 and less than approximately 3.0.

2. The method of claim 1, further comprising:

introducing said anaerobic wastewater into said treatment zone.

3. The method of claim 1, further comprising:

flowing said anaerobic wastewater through said treatment zone.

4. The method of claim 1, further comprising:

injecting said oxygen-comprising gas into said anaerobic wastewater.

5. The method of claim 1, further comprising:

diffusing said oxygen-comprising gas into said anaerobic wastewater.

6. The method of claim 1, further comprising:

introducing said one or more selected ferric/ferrous chelates into said treatment zone.

7. The method of claim 1, further comprising:

mixing said one or more selected ferric/ferrous chelates with said anaerobic wastewater.

8. The method of claim 1, further comprising:

introducing said one or more selected nitrates and/or nitrites into said treatment zone during said reacting.

9. The method of claim 1, further comprising:

mixing said one or more nitrates and/or nitrites with said anaerobic wastewater.

10. The method of claim 1, further comprising:

contacting said oxygen-comprising gas with said anaerobic wastewater for at least approximately 3 minutes in said treatment zone.

11. The method of claim 1, further comprising:

oxidizing any of said one or more selected ferric/ferrous chelates that are in a ferrous state to a ferric state.

12. The method of claim 1, further comprising:

reducing any of said one or more selected ferric/ferrous chelates that are in a ferric state to a ferrous state.

13. The method of claim 1, further comprising:

within said treatment zone, initiating a repeating oxidation-reduction cycle that comprises;

oxidizing any of said one or more selected ferric/ferrous chelates that are in a ferrous state to a ferric state; and

reducing any of said one or more selected ferric/ferrous chelates that are in a ferric state to a ferrous state.

14. The method of claim 1, further comprising:

via said reacting, converting available sulfides in said anaerobic wastewater to sulfur oxides.

15. The method of claim 1, wherein:

said oxygen-comprising gas is substantially pure oxygen.

16. The method of claim 1, wherein:

said oxygen-comprising gas is compressed air.

17. The method of claim 1, wherein:

said one or more selected ferric/ferrous chelates are one or more ferro aminocarboxylates.

18. The method of claim 1, wherein:

said one or more selected ferric/ferrous chelates are selected from ferric/ferrous MGDA, ferric/ferrous EDTA, ferric/ferrous HEIDA ferric/ferrous NTA, and ferric/ferrous gluconate.

19. The method of claim 1, wherein:

said one or more selected nitrates and/or nitrites comprises a nitrate salt and/or a nitrite salt.

20. The method of claim 1, wherein:

said anaerobic wastewater comprises an oxidant.

21. The method of claim 1, wherein:

a pH of said anaerobic wastewater when prior to entering said treatment zone is within a range of approximately 6.0 to approximately 8.5.

22. The method of claim 1, wherein:

a mass-to-mass ratio of oxygen in said oxygen-comprising gas when entering said treatment zone to available sulfide in said anaerobic wastewater when entering said treatment zone is less than approximately 2.0.

23. The method of claim 1, wherein:

said one or more selected nitrates and/or nitrites, when within said treatment zone, comprises a concentration of nitrate in a range of approximately 3.5 M to approximately 4.5 M.

24. The method of claim 1, wherein:

said one or more selected ferric/ferrous chelates, when within said treatment zone, comprises a concentration of ferric/ferrous chelate in a range of approximately 0.05 M to approximately 1.0 M.