Systems and methods for water treatment

Patent metadata

Field	Value
Publication number	US-9637400-B2
Application number	US-201514632003-A
Country	US
Kind code	B2
Filing date	Feb 26, 2015
Priority date	Nov 30, 2007
Publication date	May 2, 2017
Grant date	May 2, 2017

Abstract

Electrochemical devices and methods for water treatment are disclosed. An electrodeionization device ( 100 ) may include one or more compartments ( 110 ) containing an ionselective media, such as boron-selective resin ( 170 ). Cyclic adsorption of target ions and regeneration of the media in-situ is used to treat process water, and may be driven by the promotion of various pH conditions within the electrochemical device.

First claim

What is claimed is:

1. An electrically driven separation device, comprising:
a first compartment at least partially defined by a first cation selective membrane and a first anion selective membrane;
a second compartment at least partially defined by the first anion selective membrane and a second cation selective membrane, and at least one of the first compartment and the second compartment comprising a mixture of an anion exchange resin and a boron selective resin,
the boron-selective resin located in at least one of the first compartment and the second compartment; and
a third compartment at least partially defined by the second cation selective membrane and a bipolar membrane.

2. The device of claim 1 , wherein the mixture is 50/50 by volume of the anion exchange resin and the boron selective resin.

3. The device of claim 2 , wherein an outlet of the first compartment is fluidly connected to an inlet of the third compartment.

4. The device of claim 2 , wherein an outlet of the electrically driven separation device is fluidly connected to a potable point of use.

5. The device of claim 2 , wherein the resin comprises cis-diol functional groups.

6. The device of claim 1 , wherein the third compartment is substantially free of boron selective resin.

7. The device of claim 2 , wherein no reverse osmosis membrane is fluidly connected downstream of the electrically driven separation device.

8. The device of claim 2 , wherein no resin bed is fluidly connected downstream of the electrically driven separation device.

9. The device of claim 2 , further comprising a sensor positioned in fluid communication downstream of a resin bed in at least one of the first and second compartments, the sensor configured to provide a measurement signal representative of a concentration of boron in the treated water from the electrically driven separation device.

10. The device of claim 9 , wherein the measurement signal comprises a detected pH level.

11. The device of claim 9 , further comprising a controller in communication with the sensor and configured to produce a control signal to a power supply associated with the electrically driven separation device based at least partially on the measurement signal.

12. The device of claim 5 , wherein the boron selective media comprises N-methylglucamine functional groups.

Assignees

• Evoqua Water Tech Llc

Inventors

• Freydina Evgeniya
• Gifford Joseph D

Classifications

• C02F1/008

  Control or steering systems not provided for elsewhere in subclass C02F · CPC title

• C02F2101/108

  Boron compounds · CPC title

• C02F2303/16

  Regeneration of sorbents, filters · CPC title

• C02F2201/46115

  Electrolytic cell with membranes or diaphragms · CPC title

• C02F2209/06

  pH · CPC title