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US 2020/0140296 A1Published application
Electrodialysis cells based on the use of redox mediators
AssigneeWisconsin Alumni Research Foundation
InventorsKyoung-Shin Choi, Dohwan Nam, Dong Ki Lee
Life of this patent
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Abstract
Electrodialysis cell systems for water deionization is provided. Also provided are methods for using the electrodialysis cell systems. The cells use the forward and reverse reactions of a redox mediator and the combined operations of a deionization cell and an ion-accumulation cell to enable sustainable deionization with a significantly decreased operating voltage, relative to conventional deionization cells. The cells have applications in seawater desalination, water purification, and wastewater treatment.
Claims17
An electrodialysis cell comprising:
- an anolyte in an anode compartment, the anolyte comprising a reduced species and an oxidized species of a redox couple;
- a catholyte in a cathode compartment, the catholyte comprising the reduced species and the oxidized species of the redox couple;
- at least one deionization compartment comprising a solution comprising cations and anions between the anode compartment and the cathode compartment, wherein the deionization compartment is bounded by an anion exchange membrane on an anode side of the deionization compartment and by a cation exchange membrane on a cathode side of the deionization compartment;
- an anode in electrical communication with the anolyte in the anode compartment;
- and
- a cathode in electrical communication with the catholyte in the cathode compartment.
3 more elements
A tandem deionization system comprising:
- a deionization cell comprising:
- an anolyte in an anode compartment, the anolyte comprising a reduced species and an oxidized species of a redox couple;
- a catholyte in a cathode compartment, the catholyte comprising the reduced species and the oxidized species of the redox couple;
- at least one deionization compartment comprising a solution comprising cations and anions between the anode compartment and the cathode compartment, wherein the deionization compartment is bounded by an anion exchange membrane on an anode side of the deionization compartment and by a cation exchange membrane on a cathode side of the deionization compartment;
- an anode in electrical communication with the anolyte in the anode compartment;
- and
- a cathode in electrical communication with the catholyte in the cathode compartment;
- and
- ionization cell comprising:
- an anolyte in an anode compartment, the anolyte comprising the reduced species and the oxidized species of the redox couple;
- a catholyte in a cathode compartment, the catholyte comprising the reduced species and the oxidized species of the redox couple;
- at least one ion-accumulation compartment comprising a solution between the anode compartment and the cathode compartment, wherein the ion-accumulation compartment is bounded by a cation exchange membrane on an anode side of the deionization compartment and by an anion exchange membrane on a cathode side of the ion-accumulation compartment;
- an anode in electrical communication with the anolyte in the anode compartment;
- and
- a cathode in electrical communication with the catholyte in the cathode compartment;
- one or more conduits connecting the anode compartment of the deionization cell and the cathode compartment of the ion-accumulation cell, wherein the one or more conduits allow the anolyte from the deionization cell to circulate into the cathode compartment of the ion-accumulation cell and the catholyte from the ion-accumulation cell to circulate into the anode compartment of the deionization cell;
- and
- one or more conduits connecting the cathode compartment of the deionization cell to the anode compartment of the ion-accumulation cell, wherein the one or more conduits allow the catholyte from the deionization cell to circulate into the anode compartment of the ion-accumulation cell and the anolyte from the ion-accumulation cell to circulate into the cathode compartment of the deionization cell.
15 more elements
Dependencies are inferred from the claim text.