Disinfecting water device

Patent metadata

Field	Value
Publication number	US-9738543-B2
Application number	US-201314102119-A
Country	US
Kind code	B2
Filing date	Dec 10, 2013
Priority date	Dec 10, 2012
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

Described herein are devices for providing drinking fluid from feed sources comprising: a first reservoir, a filter for mechanically removing particles and a second reservoir for receipt of the processed feed fluid. A continually disinfecting element is disposed in either or both reservoirs to remove additional materials from the fluid. Drinking fluid is provided in a portable device. Optional light sources are provided to interact with the disinfecting elements and/or provide an indication of the contained suitability of such disinfecting elements. A method for creating drinking fluid from a feed source is also disclosed.

First claim

What is claimed is:

1. A device for producing a drinkable aqueous liquid from feed liquid comprising:
a first fluid reservoir for receiving an aqueous feed liquid;
a filter, in fluid communication with both the first fluid reservoir and a second fluid reservoir;
wherein the filter is configured to size exclude undesired materials as the aqueous feed liquid passes from the first fluid reservoir to the second fluid reservoir, so that a sufficient amount of undesired materials are removed from the aqueous feed liquid to provide drinkable water to the second fluid reservoir by one pass of the aqueous feed liquid through the filter; and
a photocatalyst, comprising 1) a titanium oxide and 2) copper, tin, or a combination thereof, disposed within the first fluid reservoir or the second fluid reservoir and contacting the water contained therein;
wherein at least one of the first and second fluid reservoirs is substantially transparent to visible light.

2. The device of claim 1 , wherein the photocatalyst is within a distance of 300 μm from a surface of the filter.

3. The device of claim 1 , wherein the photocatalyst is disposed within the first fluid reservoir within a distance of 300 μm from a surface of the first fluid reservoir.

4. The device of claim 1 , wherein the photocatalyst is disposed within the second fluid reservoir within a distance of 300 μm from a surface of the second fluid reservoir.

5. The device of claim 1 , wherein the second fluid reservoir further includes an exit opening configured to allow processed fluid to be removed from the second fluid reservoir.

6. The device of claim 1 , wherein the first fluid reservoir is substantially opaque to ultraviolet light.

7. The device of claim 1 , wherein the second fluid reservoir is substantially opaque to ultraviolet light.

8. The device of claim 1 , wherein the device is configured so that a pressure differential between the first fluid reservoir and the second fluid reservoir of at least about 1 psi will induce fluid flow across the filter.

9. The device of claim 8 , wherein the second fluid reservoir includes an exit opening configured to provide a partial vacuum to the second fluid reservoir that will induce the fluid flow across the filter.

10. The device of claim 8 , wherein the first or second reservoir comprises deformable material, wherein deformation of the reservoir induces the fluid to cross the filter.

11. The device of claim 1 , wherein the filter is tubular, having an exterior surface in fluid contact with the interior of the first fluid reservoir and an interior that forms a connecting lumen in fluid communication with the second fluid reservoir.

12. The device of claim 1 , wherein the filter has flow rate of about 0.001 liters/min to about 0.1 liters/min.

13. The device of claim 1 , wherein the filter comprises an ultrafiltration material.

14. The device of claim 1 , wherein the filter is a U-shaped tube having an exterior surface in fluid contact with the interior of the first fluid reservoir, wherein the U-shape tube has two ends and an interior lumen, wherein the interior lumen is in fluid communication with the second fluid reservoir via the two ends of the U-shaped tube.

15. The device of claim 1 , wherein the photocatalyst is photocatalytic.

16. The device of claim 15 , wherein at least about 70% of the antimicrobial activity of the photocatalyst is due to visible light photocatalysis.

17. The device of claim 15 , wherein at least about 90% of the antimicrobial activity of the photocatalyst is due to visible light photocatalysis.

18. The device of claim 1 , further comprising a light source providing sufficient illumination to the photocatalyst to cause an antimicrobial effect due to photocatalysis.

19. The device of claim 1 , wherein the photocatalyst is affixed to a surface within the first fluid reservoir.

20. The device of claim 1 , wherein the first fluid reservoir has an interior surface, and wherein the photocatalyst is a coating disposed on the interior surface.

21. The device of claim 1 , wherein the filter has an exterior surface in contact with the interior of the first fluid reservoir, wherein the photocatalyst is affixed to the exterior surface of the filter.

22. The device of claim 1 , further comprising a translucent matrix disposed within the interior of the first fluid reservoir, wherein the photocatalyst is affixed on the translucent matrix in the first fluid reservoir.

23. The device of claim 1 , wherein the photocatalyst is disposed in the interior of the first fluid reservoir.

24. The device of claim 1 , wherein the photocatalyst is disposed in the interior of the second fluid reservoir.

25. The device of claim 1 , wherein the photocatalyst is disposed in the interior of the first fluid reservoir and in the interior of the second fluid reservoir.

26. The device of claim 1 , wherein the device effects the substantial destruction of microbiological metabolites including odor or taste altering organic molecules.

27. The device of claim 1 , wherein the device effects the substantial destruction of microbiological entities.

28. The device of claim 27 , wherein the microbiological entities are viruses, protozoa, prions, fungi, bacteria, or fragments thereof.

29. The device of claim 1 , wherein the device effects the substantial destruction of fragments of microbiological entities.

30. The device of claim 1 , wherein the device effects the substantial removal of materials having a size of about 10 nm to about 10 microns.

31. The device of claim 1 , wherein the photocatalyst contacts a surface of the first fluid reservoir, the second fluid reservoir, or the filter, to disinfect the surface.

32. A method for disinfecting a fluid, comprising the steps of:
providing the device of claim 1 ;
passing an unprocessed fluid from the first reservoir through the filter second fluid reservoir; and
enabling access to the fluid contained with the second reservoir.

33. The method of claim 32 , further comprising disposing the photocatalyst in the first fluid reservoir with the unprocessed fluid.

34. The method of claim 32 , further comprising disposing the photocatalyst in the second fluid reservoir with the processed fluid.

35. The method of claim 32 , further comprising selectively altering the pressure between the first reservoir and the second reservoir to induce passage of the unprocessed fluid across the filter.

Assignees

• Nitto Denko Corp

Inventors

• Mukherjee Rajesh
• Weaver Benjamin M
• Gu Tao
• Zhou Jiadong
• Zhang Bin

Classifications

• C02F1/444

  by ultrafiltration or microfiltration · CPC title

• C02F1/725

  by catalytic oxidation · CPC title

• C02F1/30

  by irradiation · CPC title

• B01D65/022

  Membrane sterilisation · CPC title

• B01D65/08

  Prevention of membrane fouling or of concentration polarisation · CPC title