Apparatus for ultraviolet disinfection of water

• US 6,099,799 A
• Filed: 03/13/1998
• Issued: 08/08/2000
• Est. Priority Date: 03/14/1997
• Status: Expired due to Term

• Current Assignee: Culligan International Company
• Original Assignee: PURA, Inc.
• Inventors: Anderson, Ellis D.
• Primary Examiner(s): JASTRZAB, KRISANNE MARIE
• Application Number:
  US09/042,140
• Time in Patent Office: 879 Days
• Field of Search: 422/24, 422/1, 422/186.3, 250/455.11, 210/748, 210/256
• 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 1/441 by reverse osmosis
• CPC Class Codes: C02F 2201/3223 Single elongated lamp located on the central axis of a turbular reactor

Abstract

A water treatment and disinfection apparatus is provided, which has separate flow channels to allow entry and exit of separate streams of water through the apparatus, with an ultraviolet light source emitting rays through first and second ultraviolet transparent sleeves having an annular space therebetween to form an inner flow channel and an annular space between the second sleeve and an ultraviolet resistant pressure vessel. The apparatus of the invention is specially suited for disinfection of water in reverse osmosis water purification systems, whereby pre-reverse osmosis (untreated) water and post-reverse osmosis (treated) water are directed inside the apparatus of the invention to be separately and simultaneously disinfected by ultraviolet rays and again separately exit the apparatus.

Claims

1. An apparatus for liquid disinfection, comprising:

a hollow elongate vessel;

an outer hollow elongate sleeve, capable of passing disinfecting radiation therethrough, located within said hollow vessel and cooperating therewith to define an annular shaped fluid tight outer flow channel between itself and said hollow vessel;

an inner hollow elongate sleeve, capable of passing disinfecting radiation therethrough, located within said outer hollow elongate sleeve and cooperating therewith to define an annular shaped fluid tight inner flow channel between itself and said outer hollow elongate sleeve, wherein said inner flow channel is out of fluid communication relative to said outer flow channel, said inner hollow elongate sleeve forming an interior space;

a disinfecting radiation source positioned in the interior space of said inner hollow elongate sleeve to irradiate liquid in said inner flow channel and said outer flow channel;

means for circulating a liquid through said inner flow channel; and

means for circulating a liquid through said outer flow channel.

2. The liquid disinfection apparatus of claim 1 wherein said inner hollow elongate sleeve and said outer hollow elongate sleeve are formed of quartz material which is transparent to said irradiation.

3. The liquid disinfection apparatus of claim 1 wherein said disinfecting radiation is in the form of ultraviolet rays.

4. The liquid disinfection apparatus of claim 1 wherein said hollow elongate vessel is formed of an irradiation resistant material.

5. The liquid disinfection apparatus of claim 1 wherein said inner hollow elongate sleeve is closed at a first end.

6. The liquid disinfection apparatus of claim 1 further including means for sealing said radiation source within said interior space of said inner hollow elongate sleeve from said inner and outer flow channels.

7. The liquid disinfection apparatus of claim 1 wherein said means for circulating liquid through said inner flow channel and said outer flow channel comprises an inlet port and an outlet port.

8. The liquid disinfection apparatus of claim 1 wherein said means for circulating liquid through said inner flow channel comprises an inlet port and an outlet port, both said ports in fluid communication with said inner flow channel.

9. The liquid disinfection apparatus of claim 1 wherein said means for circulating liquid through said outer flow channel comprises an inlet port and an outlet port, both said ports in fluid communication with said outer flow channel.

10. A method for disinfection of liquid comprising the steps of:

forming at least two concentric liquid flow channels about a disinfecting radiation source, said at least two concentric flow channels that are out of fluid communication relative to one another and separated by at least one sleeve capable of passing disinfecting radiation therethrough, and said radiation source being sealed from said liquid flow; and

passing the liquid through said at least two concentric flow channels for irradiation and disinfection.