Treatment of a waste stream through production and utilization of oxyhydrogen gas

• US 7,837,882 B2
• Filed: 11/30/2006
• Issued: 11/23/2010
• Est. Priority Date: 11/19/2002
• Status: Active Grant

• Current Assignee: Xogen Power Inc. (Trigon Metals, Inc.)
• Original Assignee: Xogen Technologies Inc.
• Inventors: Van Vliet, David Ritchie, Campbell, Herbert Wallace, Chambers, Stephen Barrie
• Primary Examiner(s): PRINCE JR, FREDDIE GARY
• Application Number:
  US11/565,240
• Publication Number:
  US 20080006584A1
• Time in Patent Office: 1,454 Days
• Field of Search: 210/707, 210/748, 210/776, 210/192, 210/252, 210/259, 210/748.01, 210/748.17, 204/194, 204/554, 204/571, 204/660, 205/633, 205/637
• US Class Current: 210/748.17
• CPC Class Codes: C02F 1/465 by electroflotation
• CPC Class Codes: C02F 1/4672 by electrooxydation
• CPC Class Codes: C02F 11/06 by oxidation incinerators for burning waste liquors, e.g. sulfite liquor from paper-making plant F23G7/04
• CPC Class Codes: C02F 11/12 by de-watering, drying or thickening
• CPC Class Codes: C02F 2001/46185 only anodic or acidic water, e.g. for oxidizing or sterilizing
• CPC Class Codes: C02F 2101/322 Volatile compounds, e.g. benzene
• CPC Class Codes: C02F 2201/46125 Electrical variables
• CPC Class Codes: C02F 2201/4617 DC only
• CPC Class Codes: C02F 2201/46175 Electrical pulses
• CPC Class Codes: C02F 2201/782 Ozone generators
• CPC Class Codes: Y02E 20/12 Heat utilisation in combustion or incineration of waste
• CPC Class Codes: Y02E 60/36 Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
• CPC Class Codes: Y02W 10/40 Valorisation of by-products of wastewater, sewage or sludge processing

Abstract

Methods and systems for treating a waste stream in a waste treatment system involve performing a unit process of the waste treatment system by contacting the waste stream with oxyhydrogen-rich gas generated on-site by an oxyhydrogen gas generator that implements water dissociation technology. The oxyhydrogen gas generator involves applying a pulsed electrical signal to a series of closely-spaced electrodes that are submerged in the waste stream to produce oxyhydrogen-rich gas from a water component of the waste stream. Operation of the oxyhydrogen gas generator in the waste stream may accomplish one or more unit processes for waste treatment, such as oxidation, stripping, floatation, disinfection, conditioning, stabilization, thickening, and dewatering, among others. At least a portion of the oxyhydrogen-rich gas can be conveyed for a second use in the waste treatment system, such as a source of combustible fuel for incineration or power generation, for example.

Claims

1. A method for removing a contaminant from an unclarified a waste stream, comprising the steps of:

submersing two electrodes spaced less than five mm apart in the unclarified waste stream, the unclarified waste stream comprising a water component and one or both of a volatile contaminant or a solid-phase contaminant, the electrodes bordering a vertical interaction zone extending there between, said unclarified waste stream flowing through said vertical interaction zone;

applying a continuously pulsed electrical signal to at least one of the electrodes thereby generating oxyhydrogen-rich gas from the water component, the oxyhydrogen-rich gas forming bubbles in the interaction zone that rise to a surface of the unclarified waste stream;

contacting the volatile contaminant, the solid-phase contaminant or both with at least some of the bubbles as they rise through the unclarified waste stream thereby transporting a portion of the volatile contaminant, a portion of the solid-phase contaminant or both to the surface of the unclarified waste stream;

if the volatile contaminant is present;

trapping a mixture of the oxyhydrogen-rich gas and the volatile contaminant above the unclarified waste stream and transporting the mixture to a secondary process for further treatment;

if the solid-phase contaminant is present, collecting the solid-phase contaminant as a floating layer; and

said method conducted without the addition of any chemicals to said unclarified waste stream.

2. The method of claim 1 wherein the secondary process comprises combustion of the mixture.

3. The method of claim 1 wherein the secondary process comprises separation of the volatile contaminant.

4. The method of claim 1 further comprising the step of removing the floating layer from the surface of the unclarified waste stream.

5. The method of claim 1 wherein the solid-phase contaminant differs from a biosolid in that the solid-phase contaminant comprises inert solids that do not require stabilization or further treatment.

6. The method of claim 5 further comprising the step of disposing of the collected solid-phase contaminant directly to a landfill without further treatment.

7. A system for removing a contaminant from an unclarified a waste stream, the unclarified waste stream including a water component, the system comprising:

two electrodes spaced less than five mm apart to be submersed in the unclarified waste stream, said system not adding chemicals to said unclarified waste stream for the removing of a contaminant, the electrodes defining a vertical interaction zone extending there between, said unclarified waste stream flowing through said vertical interaction zone;

a power supply for applying a continuously pulsed electrical signal to at least one of the electrodes to generate from the water component oxyhydrogen-rich gas which will form bubbles in the interaction zone that rise to a surface of the unclarified waste stream;

a reaction vessel to contain the bubbles as they rise;

a gas containment lid to trap above the unclarified waste stream a mixture of the oxyhydrogen-rich gas and a volatile contaminant of the unclarified waste stream, the mixture formed by those of the bubbles that contact a portion of the volatile contaminant that transport the portion to the surface of the unclarified waste stream as a floating layer; and

means for transporting the mixture to means for further treatment.

8. The system of claim 7 further comprising:

means for collecting a solid-phase contaminant of the unclarified waste stream from the surface of the unclarified waste stream, the solid-phase contaminant having been transported to the surface of the unclarified waste stream in the reaction vessel by some of the bubbles.

9. The system of claim 7 wherein the means for further treatment comprises means for combusting the mixture.

10. The system of claim 7 wherein the means for further treatment comprises means for separation of the volatile contaminant.

11. The system of claim 8 further comprising means for removing the floating layer from the surface of the unclarified waste stream.

12. The system of claim 8 wherein the solid-phase contaminant differs from a biosolid in that the solid-phase contaminant comprises inert solids that do not require stabilization or further treatment.

13. The system of claim 12 further comprising means for disposing of the collected solid-phase contaminant directly to a landfill without further treatment.