Disinfection of water mains using ultraviolet light

• US 9,586,837 B2
• Filed: 07/15/2013
• Issued: 03/07/2017
• Est. Priority Date: 07/15/2013
• Status: Active Grant

• Current Assignee: American Water Works Company Incorporated
• Original Assignee: American Water Works Company Incorporated
• Inventors: Robison, Martin L.
• Primary Examiner(s): Yoo, Regina M
• Application Number:
  US13/942,409
• Publication Number:
  US 20150017061A1
• Time in Patent Office: 1,331 Days
• US Class Current: 1/1
• CPC Class Codes: C02F 1/325 Irradiation devices or lamp constructions
• CPC Class Codes: C02F 2201/008 Mobile apparatus and plants, e.g. mounted on a vehicle for biological treatment C02F2203/008
• CPC Class Codes: C02F 2201/009 Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells for electrolysis apparatus C02F2201/46165
• CPC Class Codes: C02F 2201/3225 Lamps immersed in an open channel, containing the liquid to be treated
• CPC Class Codes: C02F 2201/3227 Units with two or more lamps
• CPC Class Codes: C02F 2201/326 Lamp control systems
• CPC Class Codes: C02F 2209/008 comprising telecommunication features, e.g. modems or antennas
• CPC Class Codes: C02F 2303/04 Disinfection
• CPC Class Codes: C02F 2307/14 Treatment of water in water supply networks, e.g. to prevent bacterial growth
• CPC Class Codes: Y02A 20/212 Solar-powered wastewater sewage treatment, e.g. spray evaporation

Abstract

Methods are provided for disinfecting water mains using ultraviolet (UV) light. One or more UV light sources are provided and secured to a movable device that moves axially in a pipe. The frequency and intensity of the UV light is determined based on characteristics of the pipe, such as its material and size. The rate at which the movable device moves through the pipe is also determined so that the interior surface of the pipe is properly disinfected. The movable device is remotely caused to move through the pipe.

Claims

1. A method for disinfecting water mains using ultraviolet (UV) light, the method comprising:

providing one or more UV light sources that are secured to a movable device configured to move axially through a pipe, a size of the movable device being mechanically adjustable with scissor hinges such that the movable device can move axially inside one of a plurality of pipes, each of the plurality of pipes having different diameters, wherein a frequency and an intensity of the UV light from the one or more UV light sources is selected based at least on a material and a size of the pipe, and wherein the pipe is to be disinfected prior to transporting a substance from one location to another location; and

remotely causing the movable device to move axially inside of the pipe at a rate that is determined based on one or more characteristics of the pipe, wherein the frequency and the intensity of the UV light and the rate of the movable device through the pipe indicate a dosage of the UV light in relation to the pipe.

2. A method for disinfecting water mains using ultraviolet (UV) light, the method comprising:

providing one or more UV light sources that are secured to a movable device configured to move axially through a pipe, the movable device having a mechanically adjustable effective diameter equal to an inner diameter of the pipe, wherein the effective diameter of the movable device is mechanically adjustable with scissor hinges to equal a plurality of inner diameters of pipes, wherein a frequency and an intensity of the UV light from the one or more UV light sources is selected based at least on a material and a size of the pipe, and wherein the pipe is to be disinfected prior to transporting a substance from one location to another location; and

remotely causing the movable device to move axially inside of the pipe at a rate that is determined based on one or more characteristics of the pipe, wherein the frequency and the intensity of the UV light and the rate of the movable device through the pipe indicate a dosage of the UV light in relation to the pipe.

3. A method for disinfecting water mains using ultraviolet (UV) light, the method comprising:

providing one or more UV light sources that are secured to a movable device that is sized to move axially inside of a pipe, the movable device having at least three contact members that contact an inner surface of the pipe, wherein a frequency and an intensity of the UV light from the one or more UV light sources is selected based at least on a material and a size of the pipe, and wherein the pipe is to be disinfected prior to transporting a substance from one location to another location; and

remotely causing the movable device to move axially inside of the pipe while the at least three contact members maintain contact with the inner surface of the pipe at a rate that is determined based on one or more characteristics of the pipe, wherein the frequency and the intensity of the UV light and the rate of the movable device through the pipe indicate a dosage of the UV light in relation to the pipe,

wherein a size of the movable device is mechanically adjustable with scissor hinges that allow the at least three contact members to maintain contact with the inner surface of a plurality of different sized pipes.

4. The method of claim 3, further comprising disinfecting the pipe using the UV light.

5. The method of claim 3, further comprising providing a length of the pipe for transporting the substance from one location to another location, wherein the pipe is disinfected prior to being used to transport the substance.

6. The method of claim 3, wherein the disinfection of the pipe allows for disinfection of harmful pathogenic bacteria.

7. The method of claim 3, wherein the movable device comprises:

a body portion that is mechanically coupled to the one or more UV light sources, and

movement mechanisms that are coupled to the body portion for moving an automated device axially through the pipe.

8. The method of claim 3, wherein the movable device is coupled to a winch by way of a cable so that the winch causes the movable device to move in one or more of a forward direction or a reverse direction through the pipe.

9. The method of claim 8, wherein the winch is driven by a motor that allows the movable device to be remotely controlled.

10. The method of claim 3, wherein a wavelength range of the UV light is between 10 nm and 400 nm.

11. The method of claim 3, wherein a wavelength range of the UV light is between 100 nm and 280 nm.

12. The method of claim 3, wherein the at least three contact members are radially spaced around the moveable device.

13. The method of claim 3, wherein the at least three contact members are each coupled to the movable device with a scissor hinge.

14. The method of claim 13, wherein each of the scissor hinges are configured to adjust the radial position of the at least three contact members relative to a center of the movable device.

15. The method of claim 13, further comprising adjusting an effective diameter of the movable device such that the at least three contact members are radially positioned to maintain radial contact with the inner surface of the pipe.

16. The method of claim 15, wherein the inner diameter of the pipe is selected from the group comprising 4 inches, 6 inches, and 20 inches.

17. The method of claim 3, wherein the at least three contact members comprise wheels.