Ultraviolet fluid disinfection system and method

• US 6,447,720 B1
• Filed: 07/31/2000
• Issued: 09/10/2002
• Est. Priority Date: 07/31/2000
• Status: Expired due to Term

• Current Assignee: Cerinet IP LLC.
• Original Assignee: Remotelight, Inc.
• Inventors: Hauck, James Pierre, Mathis, Ronald Floyd, Riser, Andrew P., Garrett, Kurt Anthony, Horton, III, Isaac B.
• Primary Examiner(s): JASTRZAB, KRISANNE MARIE
• Application Number:
  US09/630,245
• Time in Patent Office: 771 Days
• Field of Search: 422/24, 250/450.11, 210/748
• US Class Current: 210/748.11
• CPC Class Codes: A61L 2/10 Ultraviolet radiation
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 1/725 by catalytic oxidation
• CPC Class Codes: C02F 2201/3221 Lamps suspended above a water surface or pipe
• CPC Class Codes: C02F 2201/3224 Units using UV-light guiding optical fibers
• CPC Class Codes: C02F 2201/3227 Units with two or more lamps
• CPC Class Codes: C02F 2201/3228 Units having reflectors, e.g. coatings, baffles, plates, mirrors
• CPC Class Codes: C02F 2301/024 Turbulent
• CPC Class Codes: C02F 2303/04 Disinfection

Abstract

An ultraviolet (UV) disinfection system and method for treating for treating fluids including a configuration and design to function effectively with at least one UV light source or lamp that is not submerged in the fluid. The UV light source is positioned outside the fluid to be disinfected via exposure to at least one UV dose zone outside the fluid being treated wherein UV light is projected into the at least one dose zone. The UV light source may be presented in a vertical riser configuration, wherein the UV light source is positioned above the fluid to be treated and projecting a UV dose zone downward toward and into the fluid to be treated, with the fluid moving upward toward the UV light source. Alternatively, the UV light source may be presented in a planar or horizontal design, wherein the UV light source is positioned above the fluid to be treated and projecting a WV dose zone downward toward and into the fluid to be treated, with the fluid moving in a direction substantially perpendicular to the UV dose zone. At least one interface plate is used to provide a surface zone for UV disinfection above the fluid and to provide additional treatment means for balancing pH, affecting effluent chemistry, and the like.

Claims

1. An ultraviolet disinfection (UV) system for treating fluids, the system comprising

at least one UV light source provided outside a fluid to be treated and at least one optical component positioned between the UV light source and the UV light output for providing a focused, controllable UV light output toward the fluid, thereby providing effective sterilization of microorganisms within the fluid.

2. The UV system according to claim 1, wherein the at least one UV light source is designed, configured, and connected to produce UV light creating at least one UV dose zone outside the fluid.

3. The UV system according to claim 1, further including at least one interface plate positioned between the at least one UV light source and the fluid to be treated, wherein the at least one interface plate presents a surface zone having a UV dose zone associated therewith for disinfecting the fluid to be treated.

4. The UV system according to claim 1, further including a variable UV dose zone within the fluid.

5. The UV system according to claim 4, wherein the variable UV dose zone within the fluid provides a disinfectant kill zone of increasing intensity as the fluid moves toward the at least one UV light source.

6. The UV system according to claim 1, wherein the at least one UV dose zone outside the fluid includes an airspace UV dose zone existing between the at least one UV light source and the fluid.

7. The UV system according to claim 1, wherein each of the at least one UV light source produces at least three dose zones.

8. The UV system according to claim 3, further including a vertical riser configuration wherein each of the at least one UV light source is placed at a top position projecting light downward toward the fluid, the light passing over an airspace existing between the at least one UV light source and the at least one interface plate, each of which corresponding to a light source, prior to reaching the fluid, which is moved continuously toward the light source and respective interface plate via a hydraulic system, and wherein the fluid passes through the interface plate and over the surface zone thereby being exposed to a multiplicity of UV dose zones that disinfect the fluid prior to being released outside the system.

9. The UV system according to claim 8, wherein the vertical riser configuration includes a multiplicity of UV light sources and corresponding interface plates arranged in a spaced apart, parallel vertical columnar alignment configuration.

10. The UV system according to claim 8, wherein the vertical riser configuration includes a multiplicity of UV light sources and corresponding interface plates arranged in a spaced apart, parallel angled, non-vertical alignment configuration.

11. The UV system according to claim 8, wherein the fluid cascades over the surface zone of the interface plate prior to exiting the system along exit points at the periphery of each of the interface plates.

12. The UV system according to claim 8, wherein the interface plate has a non-planar surface at the surface zone for increasing the fluid exposure to UV light disinfection at the surface zone.

13. The UV system according to claim 12, wherein the interface plate non-planar surface provides a stair-step surface over which additional turbulence of the fluid is induced as the fluid passes over the surface zone for increasing the fluid exposure to UV light disinfection at the surface zone.

14. The UV system according to claim 12, wherein the interface plate has a downwardly sloping surface so that water passes upwardly through the center of the interface plate and across the surface zone, exiting the system along exit points at the periphery of each of the interface plates via gravity.

15. The UV system according to claim 8, wherein turbulence is induced within the fluid as it rises through the vertical column toward the at least one light source and corresponding interface plate.

16. The UV system according to claim 1, further including a planar horizontal configuration wherein each of the at least one UV light source is placed at a top position projecting light downward toward the fluid, the light passing over an airspace existing between the at least one UV light source prior to reaching the fluid, which is moved continuously in a direction substantially perpendicular to the light source wherein the fluid is exposed to a multiplicity of UV dose zones that disinfect the fluid prior to being released outside the system.

17. The UV system according to claim 1, wherein the at least one light source comprises an ultra high-pressure lamp.

18. The UV system according to claim 17, wherein the ultra high pressure lamp is a fusion lamp.

19. The UV system according to claim 1, wherein the at least one light source comprises a high-pressure lamp.

20. The UV system according to claim 1, wherein the at least one light source comprises a medium pressure lamp.

21. The UV system according to claim 1, wherein the system provides a UV dose efficiency of between about 5% and about 90% for providing a dose efficiency that ensures adequate UV exposure to sterilize microorganisms within the fluid.

22. The UV system according to claim 1, wherein the at least one optical component comprises at least one lens.

23. The UV system according to claim 22, wherein the optical components comprise at least one reflector.

24. The UV system according to claim 1, wherein the at least one light source further includes at least one fiber cable into which the light is focused and directed toward the fluid.

25. The UV system according to claim 4, wherein the interface plate further includes at least one additive that influence characteristics of the fluid as the fluid passes through the interface plate and over the surface zone.

26. The UV system according to claim 25, wherein the interface plate additive is titanium dioxide.

27. A method for providing ultraviolet disinfection (UV) of fluids, the method comprising the steps of

providing a UV disinfection system comprising at least one UV light source outside a fluid to be treated and at least one interface plate positioned between the at least one UV light source and the fluid to be treated, the at least one UV light source designed, configured, and connected to produce UV light creating a first at least one UV dose zone outside the fluid;

presenting a surface zone on the at least one interface plate, wherein the surface zone has a second UV dose zone associated therewith for disinfecting the fluid to be treated;

introducing a fluid into the system, the fluid passing through a third at least one UV dose zone within the fluid and passing through the at least one interface plate and surface zone UV dose zone;

disinfecting the fluid via exposure to the UV light in each of the UV dose zones;

dispensing the disinfected fluid outside the system.

28. The method for providing UV disinfection of fluids according to claim 27, further including the step of forcing water via a hydraulic system through a vertical riser configuration of the system.

29. The method for providing UV disinfection according to claim 27, further including the step of modifying the fluid characteristics via at least one additive on the interface plate causing a reaction in the fluid.

30. The method for providing UV disinfection according to claim 27, further including the step of introducing turbulence in the fluid as the fluid passes throughout the system, thereby increasing the exposure to UV light and disinfection thereby.

31. The method according to claim 27, further including the step of introducing a catalyst at the interface plate.