Fluid purification system

• US 4,968,437 A
• Filed: 04/19/1988
• Issued: 11/06/1990
• Est. Priority Date: 05/09/1986
• Status: Expired due to Term

• Current Assignee: Electrolux Water Systems, Inc.
• Original Assignee: Electrolux Water Systems, Inc.
• Inventors: Noll, John R., Montvila, Stephen V.
• Primary Examiner(s): Sever, Frank
• Application Number:
  US07/183,658
• Time in Patent Office: 931 Days
• Field of Search: 210/195.1, 210/259, 210/295, 210/748, 210/222, 210/223, 422/24, 422/119, 250/435-438, 250/504, 204/149, 204/152, 204/186
• US Class Current: 210/748.1
• CPC Class Codes: A61L 2/10 Ultraviolet radiation
• CPC Class Codes: A61L 2/24 Apparatus using programmed or automatic operation
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 2201/3223 Single elongated lamp located on the central axis of a turbular reactor
• CPC Class Codes: C02F 2201/326 Lamp control systems
• CPC Class Codes: C02F 2201/328 Having flow diverters (baffles)

Abstract

A fluid purification system includes an elongated ultraviolet radiation emitting tube and independent fluid flow-controlling conduits. Each conduit is transparent to allow ultraviolet light emitted by the tube to enter the conduit, and defines a continuous, and is helically wound closely about the tube to insure that fluid flow through the conduits is exposed to the ultraviolet light. The system includes a filter having inlet and outlet ports. An end of each conduit is connected to one of the inlet and outlet ports of the filter. The system thus exposes the fluid to ultraviolet radiation both before and after the fluid is filtered.

Claims

1. A method for purifying liquids comprising the steps of:

supplying a liquid to be purified to a purifier inlet;

exposing said liquid to be purified substantially immediately upon entering said inlet to a predetermined quantity of ultraviolet radiation;

passing the ultraviolet-radiated liquid through a liquid purification filter;

exposing the filtered liquid to a further predetermined quantity of ultraviolet radiation, said further ultraviolet radiation being provided to said liquid until said liquid is delivered to a purifier outlet for use;

providing an ultraviolet radiation transparent, helically coiled, conduit arrangement for passing said liquid from said inlet to said filter and from said filter to said outlet;

selecting said predetermined quantity of ultraviolet radiation and the size of said conduit arrangement to assure the extinction of undesirable microorganism, bacteria and viruses in said liquid; and

isolating the liquid after entry in said purifier inlet up to delivery to said purifier outlet from an external contamination source.

2. A method for purifying liquids comprising the steps of:

supplying a liquid to be purified to a purifier inlet;

exposing said liquid to be purified substantially immediately upon entering said inlet to a predetermined quantity of ultraviolet radiation;

passing the ultraviolet-radiated liquid through a liquid purification filter;

exposing the filtered liquid to a further predetermined quantity of ultraviolet radiation;

repeating the above steps in the recited sequence a predetermined number of times and wherein, in the final exposing step, the further ultraviolet radiation is provided to said liquid until said liquid is delivered to a purifier outlet for use;

providing an ultraviolet radiation transparent, helically coiled, conduit arrangement for passing said liquid from said inlet to said filter and from said filter to said outlet;

selecting said predetermined quantity of ultraviolet radiation and the size of said conduit arrangement to assure the extinction of undesirable microorganisms, bacteria and viruses in said liquid; and

isolating the liquid after entry to said purifier inlet up to delivery to said purifier output from any external contamination source.

3. A liquid sterilization system comprising:

means for providing emitted radiation including an elongated ultraviolet radiation emitting tube coupled to a source of electrical energy for emitting ultraviolet radiation; and

a pair of tubular liquid conduits, said conduits being helically coiled in paired manner about said ultraviolet radiation emitting tube from one end of said tube to the other with each coil of said helically coiled conduits laterally abutting adjacent coils to peripherally surround substantially the entire length of said tube, each of said conduits having an inlet port at one end and an outlet port at the other and, said conduits being transparent to ultraviolet radiation to allow exposure of liquid flowing through said conduits to ultraviolet radiation emitted by said tube;

the size of said means for providing emitted radiation and the size of said conduits chosen to assure extinction of undesirable microorganisms, bacteria and viruses in liquid flowing through said conduits.

4. The system of claim 3 wherein said conduits being helically coiled in paired manner about said tube are arranged such that the coils of one conduit lie between coils of the other conduit except for the outermost coils at each end.

5. The system of claims 3 wherein the inlet port of one conduit is paired with and immediately adjacent to the outlet port of the other conduit to allow for opposing flow of liquid through said conduits.

6. The system of claim 3 including means to couple the outlet of one conduit to the inlet of the other conduit, said coupling means being arranged to prevent entry of external contamination to said system.

7. The system of claim 6 wherein said coupling means includes means to couple the outlet of said one conduit to the inlet of the other conduit through a further liquid processing means.

8. The system of claim 3 wherein said conduits are composed of plastic and are cylindrical in cross section.

9. A liquid purification system comprising:

an inlet to said system for supply of liquid to be purified;

means for emitting ultraviolet radiation;

a first conduit directly connected at one end thereof to said inlet for receiving the liquid to be purified, said first conduit having an outlet port at the other end and being transparent to the ultraviolet radiation emitted by said means for allowing said ultraviolet radiation to impinge on the liquid throughout flow of the liquid through first conduit;

liquid processing means, coupled to said outlet port of said first conduits for processing the irradiated liquid and for bringing it to an outlet of said processing means after processing;

a second conduit connected at one end thereof to said processing means outlet for receiving the processed liquid, said second conduit having an outlet port at the other end and being transparent to the ultraviolet radiation emitted by said source for allowing said ultraviolet radiation to impinge on the processed liquid throughout flow of the liquid through said second conduit to the outlet port of said second conduit and a system outlet directly connected to said outlet port of said second conduit for delivering purified liquid to a user, said system being arranged from inlet to outlet so as to prevent entry of external sources of contamination;

said first and second conduits being helically wound about said ultraviolet radiation emitting means and said first and second conduits and said ultraviolet radiation emitting means having such size to assure the extinction of undesirable microorganisms, bacteria and viruses in the liquid upon exposure to said ultraviolet energy.

10. The system of claim 9 wherein said source of ultraviolet radiation is an elongated tube coupled to a source of electrical energy for emitting ultraviolet radiation.

11. The purification system of claim 10 wherein said conduits are wound about said elongated tube in a tortuous manner so as to provide substantial exposure of liquid flowing through said conduits to ultraviolet radiation and for providing turbulence to liquid flowing through said conduits to assure that the liquid passing therethrough is thoroughly exposed to said ultraviolet radiation.

12. The purification system of claim 11 wherein said first and second conduits are helically coiled in paired manner about said ultraviolet radiation emitting tube from one end of said tube to the other with each coil of said helically coiled conduits laterally abutting adjacent coils to peripherally surround substantially the entire length of said tube.

13. The liquid purification system of claim 11 wherein said first and second conduits are helically coiled in sequential manner about substantially the entire length of said ultraviolet radiation emitting tube, each coil of said conduits laterally abutting adjacent coils.

14. The liquid purification system of claim 9 wherein said liquid processing means is a filter.

15. A modular liquid purification system comprising:

a system inlet;

a system outlet;

a number of modular liquid sterilization systems, each having;

means for providing emitted radiation including an elongated radiation emitting tube coupled to a source of electrical energy for emitting ultraviolet radiation and a pair of tubular conduits, said conduits being helically coiled in paired manner about said ultraviolet radiation emitting tube from one end of said tube to the other with each coil of said helically coiled conduits laterally abutting adjacent coils to peripherally surround substantially the entire length of said tube, each of said conduits having an inlet port at one end and an outlet port at the other end, said conduits being transparent to ultraviolet radiation to allow exposure of liquid flowing through said conduits to ultraviolet radiation and wherein the inlet port of one conduit is paired with and immediately adjacent to the outlet port of the other conduit to allow for opposing flow of liquid through said conduits;

a number of modular filter systems for filtering incoming fluid, each filter system having a filter inlet and a filter outlet; and

means for interconnecting said number of liquid sterilization systems and said number of filter systems for providing a liquid purification system having a closed liquid path from system inlet to system outlet and for having fluid supplies to said systems only following exposure to ultraviolet radiation and for having fluid filtered by said filter systems always subject to exposure to ultraviolet radiation;

the size of said means for providing emitted radiation and the size of said conduits chosen to assure extinction of undesirable microorganisms, bacteria and viruses in liquid flowing through said conduits.

16. The modular liquid purification system of claim 15 including at least two of said sterilization systems and one said filter system, said one conduits of said sterilization systems being connected in series, said other conduits of said sterilization systems being connected in series and said filter system being connected between the said two series connections.

17. The modular liquid purification system of claim 15, including at least two of said sterilization systems and at least two of said filter systems, each sterilization system having one of said filter systems being connected between two conduits thereof, each sterilization system and filter system forming a first and second liquid purification system, wherein liquid purified by said first purification system is supplied to said second purification system for further purification prior to delivery to said system outlet.