Water treatment system and method

• US 7,083,733 B2
• Filed: 11/13/2003
• Issued: 08/01/2006
• Est. Priority Date: 11/13/2003
• Status: Expired due to Term

• Current Assignee: Evoqua Water Technologies LLC (Xylem, Inc.)
• Original Assignee: USFilter Corp (Siemens AG)
• Inventors: Madhusudan, Reshma, Freydina, Evgeniya, Wilkins, Frederick, Jha, Anil D., Sezgi, Aytac
• Primary Examiner(s): Hoey, Betsey Morrison
• Application Number:
  US10/712,248
• Publication Number:
  US 20050103722A1
• Time in Patent Office: 992 Days
• Field of Search: 210/739, 210/748
• US Class Current: 210/739
• CPC Class Codes: B01D 61/52 Accessories; Auxiliary operation
• CPC Class Codes: B01D 61/54 Controlling or regulating
• CPC Class Codes: B01J 47/08 subjected to a direct electric current
• CPC Class Codes: C02F 1/20 by degassing, i.e. liberation of dissolved gases degasification of liquids in general B01D19/00; arrangement of degassing apparatus in boiler feed supply F22D
• CPC Class Codes: C02F 1/42 by ion-exchange ion-exchange in general B01J
• CPC Class Codes: C02F 1/4602 for prevention or elimination of deposits
• CPC Class Codes: C02F 1/469 by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
• CPC Class Codes: C02F 1/4695 electrodeionisation
• CPC Class Codes: C02F 2201/46115 Electrolytic cell with membranes or diaphragms
• CPC Class Codes: C02F 2201/4612 Controlling or monitoring
• CPC Class Codes: C02F 2201/4613 Inversing polarity
• CPC Class Codes: C02F 2209/005 Processes using a programmable logic controller [PLC]
• CPC Class Codes: C02F 5/00 Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents softening using ion-exchange C02F1/42

Abstract

A water treatment system provides treated or softened water to a point of use by removing a portion of any hardness-causing species contained in water from a point of entry coming from a water source, such as municipal water, well water, brackish water and water containing foulants. The water treatment system typically treats the water containing at least some undesirable species before delivering the treated water to a point of use. The water treatment system has a reservoir system in line with an electrochemical device such as an electrodeionization device. The water treatment system has a sensor or a set of sensors for measuring at least one property of the water or an operating condition of the treatment system. The water treatment system also has a controller for adjusting or regulating at least one operating parameter of the treatment system or a component of the water treatment system to optimize the operation and performance of the system or components of the system to supply water tailored to quality requirements.

Claims

1. A method for facilitating water treatment comprising providing a water treatment system comprising an electrochemical device that is fluidly connected to a reservoir system having a water property sensor and a controller that is connected to the water property sensor for regulating a water flow from the reservoir system to a point of use, the treatment system is fluidly connectable to a point of entry and to the point of use.

2. A method for facilitating water treatment comprising providing a water treatment system comprising a reservoir system having a baffle plate and an electrodeionization device, the reservoir system is fluidly connectable to a point of entry and to a water distribution system.

3. A method for purifying water comprising:

storing water from a point of use;

aerating the stored water;

removing at least a portion of any undesirable species from the water in an electrodeionization device to produce treated water; and

storing at least a portion of the treated water.

4. The method of claim 3 wherein storing the at least a portion of the treated water comprises storing the treated water at a pressure that is above atmospheric pressure.

5. A method of providing treated water comprising:

storing water from a point of entry;

removing at least a portion of any undesired species from the water in an electrochemical device to produce treated water;

measuring an LSI of the treated water;

transferring at least a portion of the treated water to a point of use according to the measured LSI;

calculating a desired property of the treated water based on at least the LSI; and

adjusting an operating parameter of the electrochemical device based on the calculated desired property.

6. The method of claim 5 wherein the electrochemical device comprises an electrodeionization device.

7. The method of claim 5 wherein storing water from the point of entry is performed at a pressure that is above atmospheric pressure.

8. The method of claim 5 further comprising minimizing any mixing of the water from the point of entry with the treated water.

9. The method of claim 5 further comprising mixing of the water from the point of entry with the treated water.

10. A method of providing treated water comprising:

storing water from a point of entry;

removing at least a portion of any undesired species from the water in an electrochemical device to produce treated water;

measuring at least one water property of the treated water;

transferring at least a portion of the treated water to a point of use according to the measured property;

calculating a desired property of the treated water based on at least one measured water property; and

adjusting a cycle time of the electrochemical device based on the calculated desired property.

11. The method of claim 10 wherein the electrochemical device comprises an electrodeionization device.

12. The method of claim 10 wherein storing water from the point of entry is performed at a pressure that is above atmospheric pressure.

13. The method of claim 10 further comprising minimizing any mixing of the water from the point of entry with the treated water.

14. The method of claim 10 further comprising mixing of the water from the point of entry with the treated water.

15. A method for providing treated water comprising:

storing water from a point of entry under a pressure that is above atmospheric pressure;

removing at least a portion of any undesired species from the water in a water treatment device to produce treated water;

measuring a property of the treated water;

determining a difference between the property of the treated water to a set point;

controlling an operating parameter of the water treatment device based on the difference between the property of the treated water and the set point; and

pre-treating the water prior to removing any undesired species.

16. The method of claim 15 wherein the water treatment device comprises an electrodeionization device.

17. The method of claim 15 further comprising minimizing any mixing of the water from the point of entry with the treated water.

18. The method of claim 15 further comprising mixing the water from the point of entry with the treated water.

19. A method for providing treated water comprising:

storing water from a point of entry under a pressure that is above atmospheric pressure;

removing at least a portion of any undesired species from the water in a water treatment device to produce treated water;

measuring a property of the treated water;

determining a difference between the property of the treated water to a set point;

controlling an operating parameter of the water treatment device based on the difference between the property of the treated water and the set point; and

controlling a flow of water to a point of use based on the difference between the property of the treated water and the set point.

20. The method of claim 19 wherein the water treatment device comprises an electrodeionization device.

21. The method of claim 19 further comprising minimizing any mixing of the water from the point of entry with the treated water.

22. The method of claim 19 further comprising mixing the water from the point of entry with the treated water.

23. A method for providing treated water comprising:

storing water from a point of entry under a pressure that is above atmospheric pressure;

removing at least a portion of any undesired species from the water in a water treatment device to produce treated water;

measuring a property of the treated water;

determining a difference between the property of the treated water to a set point;

controlling an operating parameter of the water treatment device based on the difference between the property of the treated water and the set point; and

mixing the water from the point of entry with the treated water.

24. The method of claim 23 wherein the water treatment device comprises an electrodeionization device.

25. A method for providing treated water comprising:

storing water from a point of entry under a pressure that is above atmospheric pressure;

removing at least a portion of any undesired species from the water in an electrodeionization device to produce treated water;

measuring a property of the treated water;

determining a difference between the property of the treated water to a set point; and

controlling an operating parameter of the electrodeionization device based on the difference between the property of the treated water and the set point.

26. The method of claim 25 further comprising minimizing any mixing of the water from the point of entry with the treated water.

27. The method of claim 25 further comprising mixing the water from the point of entry with the treated water.

28. The method of claim 25 further comprising controlling a flow of the water to a point of use based on the difference between the property of the treated water and the set point.

29. A method for purifying water comprising acts of:

storing water from a point of use;

releasing any volatilizable material from the stored water;

removing at least a portion of any undesirable species from the water in an electrochemical device to produce treated water; and

storing at least a portion of the treated water.

30. The method of claim 29 wherein the electrochemical device comprises an electrodeionization device.