Method and apparatus for liquid purification

• US 7,662,293 B2
• Filed: 10/08/2003
• Issued: 02/16/2010
• Est. Priority Date: 10/09/2002
• Status: Expired due to Fees

• Current Assignee: Benrad AB (Soya Group AB)
• Original Assignee: Benrad AB (Soya Group AB)
• Inventors: Liao, Haidong, Nyberg, Kristoffer, Brolin, Anders
• Primary Examiner(s): Griffin; Walter D
• Assistant Examiner(s): Allen; Cameron J
• Application Number:
  US10/530,892
• Publication Number:
  US 20060108293A1
• Time in Patent Office: 2,323 Days
• Field of Search: 210/748, 210/638, 210/760, 210/739, 210/743, 210/758, 210/723, 210/695, 210/660, 210/201, 210/223, 428/403, 428/402, 204/158.21
• US Class Current: 210/748.12
• CPC Class Codes: C02F 1/32 with ultraviolet light
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 1/725 by catalytic oxidation
• CPC Class Codes: C02F 1/78 with ozone C02F1/4672 takes precedence
• CPC Class Codes: C02F 2201/3223 Single elongated lamp located on the central axis of a turbular reactor
• CPC Class Codes: C02F 2201/3227 Units with two or more lamps
• CPC Class Codes: C02F 2201/784 Diffusers or nozzles for ozonation
• CPC Class Codes: C02F 2305/023 Reactive oxygen species, singlet oxygen, OH radical
• CPC Class Codes: C02F 2305/10 Photocatalysts
• CPC Class Codes: C02F 9/00 Multistage treatment of water, waste water or sewage
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/2991 Coated

Abstract

The present invention relates to a method for treating liquids, comprising the steps of irradiating a flow of air and a flow of the liquid to be treated at the same time in order to create ozone in both the air and the liquid, mixing the ozone-containing air with the liquid to be treated up-streams the liquid irradiating point, irradiating the flow of liquid containing the in-mixed ozone in order to break down the ozone in the liquid for producing free radicals.

Claims

1. A method for treating liquids, comprising:

irradiating a flow of air and a flow of liquid to be treated at a same time in order to create ozone in both the air and the liquid;

mixing the ozone-containing air with the liquid to be treated upstream of a liquid irradiating point;

irradiating the flow of liquid containing the in-mixed ozone in order to break down the ozone in the liquid for producing free radicals; and

exposing the liquid to at least one catalyst at the same time as the ozone is broken down for increasing an amount of free radicals,

wherein the method is performed in an apparatus comprising;

a container having an inlet and an outlet for the liquid to be treated;

a UV generating light source capable of irradiating an inside of the container;

air guidance means arranged inside the container, connected to an air source and capable of guiding air past said UV generating light source for creating ozone; and

a mixing means arranged to said inlet conduit capable of mixing the created ozone with the liquid to be treated and at least one catalyst arranged in said container and positioned to be irradiated by said UV generating light source, which catalyst is capable of breaking down the ozone for increasing the amount of free radicals,

and wherein substantially a whole of an inner surface is arranged with the catalyst.

2. The method according to claim 1, wherein UV radiation which is emitted for breaking down the ozone and contaminants has a wavelength of 180 nm-400 nm.

3. The method according to claim 2, wherein the UV radiation which is emitted for breaking down the ozone has a wavelength of 254 nm.

4. The method according to claim 1, wherein the mixing is obtained by an ejector effect into the flow of liquid.

5. The method according to claim 1, wherein said air guidance means comprises a compartment divided from the inside of the container by a quartz glass and that said UV generating light source is arranged in or adjacent said compartment.

6. The method according to claim 1, wherein the catalyst comprises titanium dioxide.

7. The method according to claim 1, wherein the mixing means comprises a throttle on the inlet, which throttle is capable of creating an ejector effect of the air/ozone into the flow of liquid.

8. The method according to claim 1 wherein the apparatus treats water and the apparatus further includes through-flowing means provided with inlets and outlets for the liquid, the UV generating light source being arranged in the through-flowing means, capable of generating ozone in the through-flowing liquid and at the same time break down the ozone in order to produce free radicals, wherein mountable and demountable connection means are arranged to the inlet and outlet of the through-flowing means.

9. The method according to claim 8, wherein the apparatus is arranged with at least two through-flowing means.

10. The method according to claim 9, wherein said through-flowing means are arranged in series, whereby a first through-flowing means is connected to an inlet pipe for liquid to be treated and that a second through-flowing means is connected to an outlet pipe for the treated liquid.

11. The method according to claim 9, wherein at least two of the said through flowing means are connected in parallel to an inlet pipe for liquid to be treated and an outlet pipe for the treated liquid.

12. The method according to claim 8, wherein the through-flowing means is an elongated pipe.

13. The method according to claim 12, wherein the UV generating light source is arranged in one end of the elongated pipe.

14. The method according to claim 8, wherein ceramics are arranged on the inside of the through-flowing means at least adjacent said UV generating light source.

15. The method according to claim 14, wherein the ceramics comprise titanium oxides.

16. The method according to claim 8, wherein the through-flowing means is arranged adjacent a water outlet for human use, or a shower head for human use.

17. The method according to claim 16, wherein the through-flowing means is arranged between a water faucet and the water outlet.

18. The method according to claim 16, wherein the through-flowing means is arranged between a warm water pipe and a faucet connected to the water outlet.

19. A method for treating liquids, comprising:

irradiating a flow of air and a flow of liquid to be treated at a same time in order to create ozone in both the air and the liquid;

mixing the ozone-containing air with the liquid to be treated upstream of a liquid irradiating point;

irradiating the flow of liquid containing the in-mixed ozone in order to break down the ozone in the liquid for producing free radicals; and

exposing the liquid to at least one catalyst at the same time as the ozone is broken down for increasing an amount of free radicals.

20. A method for treating liquids, comprising:

irradiating at a region of 180-400 nm including 183.7 nm a flow of air and a flow of liquid to be treated at a same time in order to create ozone in both the air and the liquid;

mixing the ozone-containing air with the liquid to be treated upstream of a liquid irradiating point;

irradiating at a region of 180-400 nm including 254 nm the flow of liquid containing the in-mixed ozone in order to break down the ozone in the liquid for producing free radicals; and

exposing the liquid to at least one catalyst at the same time as the ozone is broken down for increasing an amount of free radicals.