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1. WO2013003012 - IMPROVED DISSOLVED AIR FLOTATION SYSTEM AND METHOD

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[ EN ]

CLAIMS

1. A water treatment system comprising:

an air dissolving pump having a pump outlet fluidly coupled to a proximal end of a first fluid conduit;

a relaxation pipe having an inlet fluidly coupled to a distal end of the first fluid conduit and an outlet fluidly coupled to a proximal end of a second fluid conduit, the relaxation pipe having a diameter greater than a diameter of the first fluid conduit and having a diameter greater than a diameter of the second fluid conduit; and

a dissolved air flotation unit having a first inlet fluidly coupled to a distal end of the second fluid conduit.

2. The water treatment system of claim 1, wherein the dissolved air flotation unit further comprises:

a contact chamber having a plurality of contact chamber walls defining an interior volume of the contact chamber; and

a plurality of interleaved baffles, each of the interleaved baffles extending from one of the plurality of contact chamber walls and into the interior volume of the contact chamber.

3. The dissolved air flotation apparatus of claim 2, wherein the dissolved air flotation unit further comprises a flotation chamber including a flotation chamber floor and a raised floor positioned above the flotation chamber floor, the raised floor including at least one aperture.

4. The water treatment system of claim 3, further comprising a sludge recycle system having a recycle system inlet in fluid communication with the flotation chamber and a recycle system outlet in fluid communication with a second inlet of the dissolved air flotation unit, the sludge recycle system configured to direct recycled sludge into the second inlet of the dissolved air flotation unit.

5. The water treatment system of claim 4, further comprising a treatment water inlet and a source of flocculent fluidly coupled to an inlet of a static mixer comprising one or more baffles, the static mixer having an outlet in fluid communication with the second inlet of the dissolved air flotation unit.

6. The water treatment system of claim 5, further comprising a membrane filtration unit having an inlet in fluid communication with an outlet of the dissolved air flotation unit.

7. The water treatment system of claim 1, further comprising:

a fluid delivery sub-system including a gasified fluid delivery conduit positioned within a flocculated feed delivery conduit, the gasified fluid delivery conduit having a gasified fluid delivery inlet being in fluid communication with the pump outlet of the air dissolving pump; and

a mixing conduit having a mixing conduit inlet fluidly coupled to an outlet of the fluid delivery sub-system and a mixing conduit outlet fluidly coupled to an inlet of a contact chamber of the dissolved air flotation unit.

8. The water treatment system of claim 1, further comprising:

a fluid delivery sub-system including a flocculated feed delivery conduit positioned within a gasified fluid delivery conduit, the gasified fluid delivery conduit having a gasified fluid delivery inlet being in fluid communication with the pump outlet of the air dissolving pump; and

a mixing conduit having a mixing conduit inlet fluidly coupled to an outlet of the fluid delivery sub-system and a mixing conduit outlet fluidly coupled to an inlet of a contact chamber of the dissolved air flotation unit.

9. A dissolved air flotation apparatus comprising:

a fluid inlet;

a flocculation chamber in fluid communication downstream of the fluid inlet;

a contact chamber in fluid communication downstream of the flocculation chamber, the contact chamber comprising a plurality of interleaved baffles extending into an interior volume of the contact chamber from walls of the contact chamber;

a gasified fluid inlet positioned below the plurality of baffles and in fluid

communication with the contact chamber;

a flotation chamber in fluid communication downstream of the contact chamber; and an effluent outlet in fluid communication downstream of the flotation chamber.

10. The dissolved air flotation apparatus of claim 9, further comprising: an air dissolving pump having a pump outlet fluidly coupled to a proximal end of a first fluid conduit; and

a relaxation pipe having an inlet fluidly coupled to a distal end of the first fluid conduit and an outlet fluidly coupled to the gasified fluid inlet through a second fluid conduit, the relaxation pipe having a diameter greater than a diameter of the first fluid conduit and having a diameter greater than a diameter of the second fluid conduit.

11. The dissolved air flotation apparatus of claim 9, further comprising a sludge recycle system having a recycle system inlet in fluid communication with the flotation chamber and a recycle system outlet in fluid communication with the flocculation chamber, the sludge recycle system configured to direct recycled sludge from the flotation chamber into the flocculation chamber.

12. The dissolved air flotation apparatus of claim 9, wherein the flotation chamber further comprises tube settlers positioned proximate a lower portion of the flotation chamber, the tube settlers configured to restrict a flow of fluid from the flotation chamber to the effluent outlet.

13. The dissolved flotation apparatus of claim 9, wherein the flotation chamber further comprises a flotation chamber floor and a raised floor positioned at a distance above the flotation chamber floor, the raised floor including at least one floor plate having including at least one aperture.

14. The dissolved flotation apparatus of claim 13, wherein the raised floor plate is substantially parallel to the flotation chamber floor.

15. The dissolved flotation apparatus of claim 14, wherein the raised floor further comprises a plurality of inclined plates positioned below the at least one floor plate, the plurality of inclined plates each having at least a portion inclined relative to the at least one floor plate.

16. A method of facilitating the removal of contaminants from a treatment water, the method comprising:

introducing the treatment water into a first inlet of a dissolved air flotation unit; producing a pressurized gasified fluid in an air dissolving pump;

flowing the pressurized gasified fluid from an outlet of the air dissolving pump through a first conduit to an inlet of a relaxation pipe, the relaxation pipe having a diameter greater than a diameter of the first conduit;

flowing the pressurized gasified fluid from an outlet of the relaxation pipe into an inlet of a second conduit, the second conduit having a diameter smaller than the diameter of the relaxation pipe;

flowing the pressurized gasified fluid through an outlet of the second conduit positioned within a contact chamber of the dissolved air flotation unit;

reducing a pressure of the pressurized gasified fluid; and

forming micro-bubbles within the contact chamber.

17. The method of claim 16, further comprising flowing the treatment water through the contact chamber and into a flotation chamber of the dissolved air flotation unit, the micro-bubbles facilitating removal of suspended solids from the treatment water and the formation of a sludge including at least a portion of the removed suspended solids;

removing a portion of the sludge from a surface of the treatment water in the flotation chamber; and

recycling the sludge into a flocculation chamber of the dissolved air flotation unit, the flocculation chamber being in fluid communication upstream of the contact chamber.

18. The method of claim 16, further comprising directing the treatment water in a serpentine flow path about a plurality of interleaved baffles in the contact chamber.

19. The method of claim 16, further comprising passing the treated water over a plurality of inclined plates positioned below a raised floor of the flotation chamber.

20. The method of claim 16, further comprising filtering the treated water through a membrane filtration unit downstream of the dissolved air flotation unit.

21. A method of desalinating seawater, the method comprising:

introducing the seawater into a first inlet of a dissolved air flotation unit, the seawater including a quantity of total suspended solids;

producing a pressurized gasified fluid in an air dissolving pump;

flowing the pressurized gasified fluid from an outlet of the air dissolving pump through a first conduit to an inlet of a relaxation pipe, the relaxation pipe having a diameter greater than a diameter of the first conduit;

flowing the pressurized gasified fluid from an outlet of the relaxation pipe into an inlet of a second conduit, the second conduit having a diameter smaller than the diameter of the relaxation pipe;

flowing the pressurized gasified fluid through an outlet of the second conduit positioned within a contact chamber of the dissolved air flotation unit;

reducing a pressure of the pressurized gasified fluid;

forming micro-bubbles within the contact chamber removing contaminants from the seawater and forming a treated seawater;

discharging the treated seawater out of an outlet of the dissolved air flotation unit; and directing the treated seawater from the outlet of the dissolved air flotation unit to a downstream desalination unit.

22. The method of claim 21, further comprising discharging a product water having a concentration of about 500 mg/L TDS from the downstream desalination unit.

23. The method of claim 22, wherein the downstream desalination unit comprises an electrically-driven separation apparatus.

24. The method of claim 21, wherein forming the treated seawater comprises removing greater than about 90% of the quantity of total suspend solids from the seawater.

25. A seawater treatment system comprising:

a dissolved air flotation system including:

an air dissolving pump having a pump outlet fluidly coupled to a proximal end of a first fluid conduit;

a relaxation pipe having an inlet fluidly coupled to a distal end of the first fluid conduit and an outlet fluidly coupled to a proximal end of a second fluid conduit, the relaxation pipe having a diameter greater than a diameter of the first fluid conduit and having a diameter greater than a diameter of the second fluid conduit;

a dissolved air flotation unit having a first inlet fluidly coupled to a distal end of the second fluid conduit; and

a desalination unit having an inlet in fluid communication with an outlet of the dissolved air flotation system.

26. The seawater treatment system of claim 25, wherein the desalination unit is an electrically-driven separation apparatus.