Back to results
US 6,649,037 B2Granted
Electrodeionization apparatus and method
AssigneeUnited States Filter Corporation
InventorsLi-Shiang Liang, Anil Jha, John Arba, Stephane Dupont
Life of this patent
Estimating the term…
Abstract
An electrodeionization apparatus and method for purifying a fluid. A fluid, such as water, can be purified by removing weakly ionizable species from the fluid. Weakly ionizable species may be dissociated at different pH levels to facilitate removal from the fluid in an electrodeionization device.
Claims42
An electrodeionization apparatus comprising:
- at least one ion-depletion compartment;
- a first layer of a first ion exchange material positioned in the at least one ion-depletion compartment;
- a second layer of a second ion exchange material positioned adjacent and downstream of the first layer;
- and
- a third layer comprising anion and cation exchange material positioned adjacent to and downstream of the second layer.
2 more elements
An electrodeionization apparatus comprising:
- a first cell comprising anion or cation exchange material;
- a second cell in fluid communication with and downstream of the first cell, the second cell comprising anion or cation exchange material and being different than the exchange material of the first cell;
- and
- a third cell in fluid communication with and downstream of the second cell, the third cell comprising a mixed ion exchange material.
1 more element
A water purification apparatus comprising:
- a first reverse osmosis device;
- an electrodeionization apparatus in fluid communication with the first reverse osmosis device;
- an anion exchange layer disposed in the electrodeionization apparatus;
- a second reverse osmosis device in fluid communication with the electrodeionization apparatus, the second reverse osmosis device in communication with the first reverse osmosis device via the electrodeionization apparatus;
- and
- a bypass loop providing fluid communication between the first reverse osmosis device and the second reverse osmosis device.
3 more elements
A water purification apparatus comprising:
- a first electrodeionization cell comprising ion exchange material;
- a second electrodeionization cell comprising ion exchange material;
- a first reverse osmosis device downstream of the first electrodeionization cell and in fluid communication with the second electrodeionization cell;
- and
- a second reverse osmosis device downstream of the second electrodeionization cell.
2 more elements
An electrodeionization device comprising:
- a first ion exchange layer comprising mixed ion exchange material;
- a second ion exchange layer comprising anion exchange material, the second layer adjacent to and downstream of the first layer;
- and
- a third ion exchange layer consisting essentially of cation exchange material, the third layer adjacent to and downstream of the second layer.
1 more element
Dependencies are inferred from the claim text.