IP Library › Granted Patent US 12,551,849
Granted Patent B2
US 12,551,849 · App. 18/106,409 · Granted Feb 17, 2026

System and method for reducing the dissolved solids of a non-potable aqueous flow

Inventor: Jack C. Gardiner (Houston, TX)
B01D61/428B01D61/145B01D63/06B01D71/14B01D71/36C02F1/4691B01D2313/201B01D2313/21B01D2313/23B01D2313/345B01D2313/40C02F2103/08C02F2201/003
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Quick Facts
Patent No.
US 12,551,849
App. No.
18/106,409
Granted
Feb 17, 2026
Kind
B2
Abstract

The present disclosure describes a flow-electrode capacitive deionization (FCDI) desalination system and method of use. An FCDI desalination system is described employing one or more FCDI cells equipped with two coaxially oriented membranes mounted within a column housing capped with two end caps, each end cap comprising two carbon slurry ports and one water port. The column is lined with a chargeable sleeve capable of receiving a positive or negative charge. The annular space between the chargeable sleeve and the outside surface of the outer concentric membrane creates a flow path for a first carbon slurry to pass therethrough. The space between the inside surface of the outer concentric membrane and the outer surface of the inner concentric membrane creates a flow path for the saline water to be treated. The space within the inner annular portion of the inner concentric membrane creates a flow path for a second carbon slurry and contains a chargeable rod or wire capable of receiving an opposite charge. The first and second opposed end caps on the column are outfitted to continue these independent flow paths. As the saline water travels through its flow path, its salt ions are removed through the coaxial membranes via the two carbon slurries.

Claims (115)

1 . A flow-electrode capacitive deionization (FCDI) desalination cell comprising:

a. a tubular housing oriented about a central axis and having an upper end, a lower end, an inner surface, an outer surface, an interior space and an inside diameter;

b. an outer tubular membrane extending about the central axis between the tubular housing upper end and the tubular housing lower end, the outer tubular membrane having an upper end, a lower end, an outer surface, an inner surface and an inside diameter, and an outside diameter smaller than the tubular housing inside diameter;

c. an inner tubular membrane extending about the central axis between the tubular housing upper end and the tubular housing lower end, the inner tubular membrane having an upper end, a lower end, an outer surface, an inner surface, an inside diameter, and an outside diameter smaller than the outer tubular membrane inside diameter, the inner tubular membrane being coaxially aligned along the central axis within the outer tubular membrane;

d. a chargeable sleeve lining the inner surface of the tubular housing, the chargeable sleeve having upper and lower ends, an inner surface, and is capable of receiving a positive or negative polarity;

e. a chargeable wire extending down the central axis through the tubular housing member, the chargeable wire having an upper end and a lower end, and is capable of receiving a positive or negative polarity opposite to the polarity of the chargeable sleeve;

f. a first annular space between the outer tubular member outer surface and the chargeable sleeve inner surface for receiving a first carbon slurry;

g. a second annular space between the outer tubular membrane inner surface and the inner tubular membrane outer surface for receiving a feed solution to be treated;

h. a third annular space between the inside diameter of the inner tubular membrane for receiving a second carbon slurry;

i. a tubular lower end cap attached to the tubular housing lower end and comprising

i. a cylindrical side wall having a left side and a right side,

ii. an end face,

iii. a right side inlet port extending outwardly from the right side wall of the lower end cap for receiving a first carbon slurry flow, the right side inlet port creating a separate first carbon slurry flow channel within the tubular lower end cap,

iv. a left side inlet port extending outwardly from the left side wall of the lower end cap for receiving the feed solution to be treated, the left side inlet port creating a separate feed solution flow channel within the tubular lower end cap,

v. a lower inlet port extending outwardly from the lower end cap end face about the central axis for receiving a second carbon slurry flow, the lower inlet port creating a separate second carbon slurry flow channel within the tubular lower end cap,

vi. a chargeable wire lower electrode connected to the chargeable wire lower end and extending along the central axis through the lower second carbon slurry inlet port in sealed fashion,

vii. an inner tubular barbed fitting extending inwardly along the central axis from the lower second carbon slurry inlet port, the inner tubular barbed fitting having an outer surface, an inner surface defining a first bore space, a top end connected to the second carbon slurry inlet port, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the inner tubular barbed fitting capable of receiving and securing the lower end of the inner tubular membrane about the central axis,

viii. an outer tubular barbed fitting extending coaxially inwardly along the central axis outside of the inner tubular barbed fitting, the outer tubular barbed fitting having an outer surface, an inner surface defining a second bore space, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the outer tubular barbed fitting capable of receiving and securing the outer tubular membrane about the central axis in coaxial relationship with the inner tubular membrane,

ix. a lower chargeable sleeve interface port for receiving a lower chargeable sleeve electrode therethrough in sealed fashion, the lower chargeable sleeve electrode being attachable to the lower end of the chargeable sleeve;

j. a tubular upper end cap attached to the tubular housing upper end and comprising

i. a cylindrical side wall having a left side and a right side,

ii. an end face,

iii. a right side outlet port extending outwardly from the right side wall of the lower end cap for discharging the first carbon slurry flow, the right side outlet port creating a separate first carbon slurry flow channel within the tubular upper end cap,

iv. a left side outlet port extending outwardly from the left side wall of the upper end cap for discharging a treated solution, the left side outlet port creating a separate treated solution flow channel within the tubular upper end cap,

v. an upper outlet port extending outwardly from the upper end cap end face about the central axis for discharging the second carbon slurry flow, the upper outlet port creating a separate second carbon slurry flow channel within the tubular upper end cap,

vi. a chargeable wire upper electrode connected to the chargeable wire upper end and extending along the central axis through the upper second carbon slurry outlet port in sealed fashion,

vii. an inner tubular barbed fitting extending inwardly along the central axis from the upper second carbon slurry outlet port, the inner tubular barbed fitting having an outer surface, an inner surface defining a first bore space, a top end connected to the second carbon slurry inlet port, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the inner tubular barbed fitting capable of receiving and securing the upper end of the inner tubular membrane about the central axis,

viii. an outer tubular barbed fitting extending coaxially inwardly along the central axis outside of the inner tubular barbed fitting, the outer tubular barbed fitting having an outer surface, an inner surface defining a second bore space, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the outer tubular barbed fitting capable of receiving and securing the outer tubular membrane about the central axis in coaxial relationship with the inner tubular membrane,

ix. an upper chargeable sleeve interface port for receiving an upper chargeable sleeve electrode therethrough in sealed fashion, the upper chargeable sleeve electrode being attachable to the upper end of the chargeable sleeve;

k. a first carbon slurry flow path comprising the lower right side inlet port, the separate first carbon slurry flow channel within the lower end cap, the first annular space, the separate first carbon slurry flow channel within the upper end cap, and the upper right side outlet port;

l. a feed solution flow path comprising the lower left side inlet port, the separate feed solution flow channel within the lower end cap, the second annular space, the separate treated solution channel within the upper end cap, and the upper left side outlet port; and

m. a second carbon slurry flow path comprising the lower inlet port on the lower end cap, the separate annular second carbon slurry flow channel within the lower end cap, the third annular space, the separate annular second carbon slurry flow channel within the upper end cap, and the upper inlet port on the upper end cap.

2 . The flow-electrode capacitive deionization (FCDI) desalination cell of claim 1 wherein the chargeable sleeve, the upper and lower chargeable sleeve electrodes, the chargeable wire and the upper and lower chargeable wire electrodes comprise titanium.

3 . The flow-electrode capacitive deionization (FCDI) desalination cell of claim 2 wherein the titanium is a coated titanium.

4 . The FCDI desalination cell of claim 1 wherein the tubular membranes are selected from the group consisting of ultra-fine (UF) filter tubes, cellulose ester membranes, tubular ionic membranes, porous and compressible PTFE and/or fluorocopolymers.

5 . A flow-electrode capacitive deionization (FCDI) desalination system comprising:

A. an FCDI desalination cell comprising

a. a tubular housing oriented about a central axis and having an upper end, a lower end, an inner surface, an outer surface, an interior space and an inside diameter;

b. an outer tubular membrane extending about the central axis between the tubular housing upper end and the tubular housing lower end, the outer tubular membrane having an upper end, a lower end, an outer surface, an inner surface and an inside diameter, and an outside diameter smaller than the tubular housing inside diameter;

c. an inner tubular membrane extending about the central axis between the tubular housing upper end and the tubular housing lower end, the inner tubular membrane having an upper end, a lower end, an outer surface, an inner surface, an inside diameter, and an outside diameter smaller than the outer tubular membrane inside diameter, the inner tubular membrane being coaxially aligned along the central axis within the outer tubular membrane;

d. a chargeable sleeve lining the inner surface of the tubular housing, the chargeable sleeve having upper and lower ends, an inner surface, and is capable of receiving a positive or negative polarity;

e. a chargeable wire extending down the central axis through the tubular housing member, the chargeable wire having an upper end and a lower end, and is capable of receiving a positive or negative polarity opposite to the polarity of the chargeable sleeve;

f. a first annular space between the outer tubular member outer surface and the chargeable sleeve inner surface for receiving a first carbon slurry;

g. a second annular space between the outer tubular membrane inner surface and the inner tubular membrane outer surface for receiving a feed solution to be treated;

h. a third annular space between the inside diameter of the inner tubular membrane for receiving a second carbon slurry;

i. a tubular lower end cap attached to the tubular housing lower end and comprising

i. a cylindrical side wall having a left side and a right side,

ii. an end face,

iii. a right side inlet port extending outwardly from the right side wall of the lower end cap for receiving a first carbon slurry flow, the right side inlet port creating a separate first carbon slurry flow channel within the tubular lower end cap,

iv. a left side inlet port extending outwardly from the left side wall of the lower end cap for receiving the feed solution to be treated, the left side inlet port creating a separate feed solution flow channel within the tubular lower end cap,

v. a lower inlet port extending outwardly from the lower end cap end face about the central axis for receiving a second carbon slurry flow, the lower inlet port creating a separate second carbon slurry flow channel within the tubular lower end cap,

vi. a chargeable wire lower electrode connected to the chargeable wire lower end and extending along the central axis through the lower second carbon slurry inlet port in sealed fashion,

vii. an inner tubular barbed fitting extending inwardly along the central axis from the lower second carbon slurry inlet port, the inner tubular barbed fitting having an outer surface, an inner surface defining a first bore space, a top end connected to the second carbon slurry inlet port, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the inner tubular barbed fitting capable of receiving and securing the lower end of the inner tubular membrane about the central axis,

viii. an outer tubular barbed fitting extending coaxially inwardly along the central axis outside of the inner tubular barbed fitting, the outer tubular barbed fitting having an outer surface, an inner surface defining a second bore space, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the outer tubular barbed fitting capable of receiving and securing the outer tubular membrane about the central axis in coaxial relationship with the inner tubular membrane,

ix. a lower chargeable sleeve interface port for receiving a lower chargeable sleeve electrode therethrough in sealed fashion, the lower chargeable sleeve electrode being attachable to the lower end of the chargeable sleeve;

j. a tubular upper end cap attached to the tubular housing upper end and comprising

i. a cylindrical side wall having a left side and a right side,

ii. an end face,

iii. a right side outlet port extending outwardly from the right side wall of the lower end cap for discharging the first carbon slurry flow, the right side outlet port creating a separate first carbon slurry flow channel within the tubular upper end cap,

iv. a left side outlet port extending outwardly from the left side wall of the upper end cap for discharging a treated solution, the left side outlet port creating a separate treated solution flow channel within the tubular upper end cap,

v. an upper outlet port extending outwardly from the upper end cap end face about the central axis for discharging the second carbon slurry flow, the upper outlet port creating a separate second carbon slurry flow channel within the tubular upper end cap,

vi. a chargeable wire upper electrode connected to the chargeable wire upper end and extending along the central axis through the upper second carbon slurry outlet port in sealed fashion,

vii. an inner tubular barbed fitting extending inwardly along the central axis from the upper second carbon slurry outlet port, the inner tubular barbed fitting having an outer surface, an inner surface defining a first bore space, a top end connected to the second carbon slurry inlet port, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the inner tubular barbed fitting capable of receiving and securing the upper end of the inner tubular membrane about the central axis,

viii. an outer tubular barbed fitting extending coaxially inwardly along the central axis outside of the inner tubular barbed fitting, the outer tubular barbed fitting having an outer surface, an inner surface defining a second bore space, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the outer tubular barbed fitting capable of receiving and securing the outer tubular membrane about the central axis in coaxial relationship with the inner tubular membrane,

ix. an upper chargeable sleeve interface port for receiving an upper chargeable sleeve electrode therethrough in sealed fashion, the upper chargeable sleeve electrode being attachable to the upper end of the chargeable sleeve;

k. a first carbon slurry flow path comprising the lower right side inlet port, the separate first carbon slurry flow channel within the lower end cap, the first annular space, the separate first carbon slurry flow channel within the upper end cap, and the upper right side outlet port;

l. a feed solution flow path comprising the lower left side inlet port, the separate feed solution flow channel within the lower end cap, the second annular space, the separate treated solution channel within the upper end cap, and the upper left side outlet port;

m. a second carbon slurry flow path comprising the lower inlet port on the lower end cap, the separate annular second carbon slurry flow channel within the lower end cap, the third annular space, the separate annular second carbon slurry flow channel within the upper end cap, and the upper inlet port on the upper end cap;

B. a first motive force for introducing the feed solution, to be desalinated, through the feed solution inlet port and into the cell, at a first pressure P1, and for urging the feed solution to move through the feed solution flow path while contacting the outer surface of the inner tubular membrane and the inner surface of the outer tubular membrane before exiting the cell through the treated solution outlet port;

C. a source of the first carbon slurry;

D. a second motive force for introducing the first carbon slurry into the first carbon slurry flow path, at a second pressure P2; and

E. a third motive force for introducing the second carbon slurry into the second carbon slurry flow path, at a third pressure P3.

6 . The flow-electrode capacitive deionization (FCDI) desalination cell of claim 5 wherein the chargeable sleeve, the upper and lower chargeable sleeve electrodes, the chargeable wire and the upper and lower chargeable wire electrodes comprise titanium.

7 . The flow-electrode capacitive deionization (FCDI) desalination cell of claim 6 wherein the titanium is a coated titanium.

8 . The FCDI desalination cell of claim 5 wherein the plurality of tubular membranes are selected from the group consisting of ultra-fine (UF) filter tubes, cellulose ester membranes, tubular ionic membranes, porous and compressible PTFE and/or fluorocopolymers.

9 . A method of flow-electrode capacitive deionization (FCDI) desalination of brine or brackish feed water solution comprising the steps of:

A. introducing the brine or brackish feed water solution into an FCDI desalination cell, the cell comprising

a. a tubular housing oriented about a central axis and having an upper end, a lower end, an inner surface, an outer surface, an interior space and an inside diameter;

b. an outer tubular membrane extending about the central axis between the tubular housing upper end and the tubular housing lower end, the outer tubular membrane having an upper end, a lower end, an outer surface, an inner surface and an inside diameter, and an outside diameter smaller than the tubular housing inside diameter;

c. an inner tubular membrane extending about the central axis between the tubular housing upper end and the tubular housing lower end, the inner tubular membrane having an upper end, a lower end, an outer surface, an inner surface, an inside diameter, and an outside diameter smaller than the outer tubular membrane inside diameter, the inner tubular membrane being coaxially aligned along the central axis within the outer tubular membrane;

d. a chargeable sleeve lining the inner surface of the tubular housing, the chargeable sleeve having upper and lower ends, an inner surface, and is capable of receiving a positive or negative polarity;

e. a chargeable wire extending down the central axis through the tubular housing member, the chargeable wire having an upper end and a lower end, and is capable of receiving a positive or negative polarity opposite to the polarity of the chargeable sleeve;

f. a first annular space between the outer tubular member outer surface and the chargeable sleeve inner surface for receiving a first carbon slurry;

g. a second annular space between the outer tubular membrane inner surface and the inner tubular membrane outer surface for receiving a feed solution to be treated;

h. a third annular space between the inside diameter of the inner tubular membrane for receiving a second carbon slurry;

i. a tubular lower end cap attached to the tubular housing lower end and comprising

i. a cylindrical side wall having a left side and a right side,

ii. an end face,

iii. a right side inlet port extending outwardly from the right side wall of the lower end cap for receiving a first carbon slurry flow, the right side inlet port creating a separate first carbon slurry flow channel within the tubular lower end cap,

iv. a left side inlet port extending outwardly from the left side wall of the lower end cap for receiving the feed solution to be treated, the left side inlet port creating a separate feed solution flow channel within the tubular lower end cap,

v. a lower inlet port extending outwardly from the lower end cap end face about the central axis for receiving a second carbon slurry flow, the lower inlet port creating a separate second carbon slurry flow channel within the tubular lower end cap,

vi. a chargeable wire lower electrode connected to the chargeable wire lower end and extending along the central axis through the lower second carbon slurry inlet port in sealed fashion,

vii. an inner tubular barbed fitting extending inwardly along the central axis from the lower second carbon slurry inlet port, the inner tubular barbed fitting having an outer surface, an inner surface defining a first bore space, a top end connected to the second carbon slurry inlet port, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the inner tubular barbed fitting capable of receiving and securing the lower end of the inner tubular membrane about the central axis,

viii. an outer tubular barbed fitting extending coaxially inwardly along the central axis outside of the inner tubular barbed fitting, the outer tubular barbed fitting having an outer surface, an inner surface defining a second bore space, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the outer tubular barbed fitting capable of receiving and securing the outer tubular membrane about the central axis in coaxial relationship with the inner tubular membrane,

ix. a lower chargeable sleeve interface port for receiving a lower chargeable sleeve electrode therethrough in sealed fashion, the lower chargeable sleeve electrode being attachable to the lower end of the chargeable sleeve;

j. a tubular upper end cap attached to the tubular housing upper end and comprising

i. a cylindrical side wall having a left side and a right side,

ii. an end face,

iii. a right side outlet port extending outwardly from the right side wall of the lower end cap for discharging the first carbon slurry flow, the right side outlet port creating a separate first carbon slurry flow channel within the tubular upper end cap,

iv. a left side outlet port extending outwardly from the left side wall of the upper end cap for discharging a treated solution, the left side outlet port creating a separate treated solution flow channel within the tubular upper end cap,

v. an upper outlet port extending outwardly from the upper end cap end face about the central axis for discharging the second carbon slurry flow, the upper outlet port creating a separate second carbon slurry flow channel within the tubular upper end cap,

vi. a chargeable wire upper electrode connected to the chargeable wire upper end and extending along the central axis through the upper second carbon slurry outlet port in sealed fashion,

vii. an inner tubular barbed fitting extending inwardly along the central axis from the upper second carbon slurry outlet port, the inner tubular barbed fitting having an outer surface, an inner surface defining a first bore space, a top end connected to the second carbon slurry inlet port, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the inner tubular barbed fitting capable of receiving and securing the upper end of the inner tubular membrane about the central axis,

viii. an outer tubular barbed fitting extending coaxially inwardly along the central axis outside of the inner tubular barbed fitting, the outer tubular barbed fitting having an outer surface, an inner surface defining a second bore space, a lower end, and a plurality of barbs on the outer surface proximate the lower end, the outer tubular barbed fitting capable of receiving and securing the outer tubular membrane about the central axis in coaxial relationship with the inner tubular membrane,

ix. an upper chargeable sleeve interface port for receiving an upper chargeable sleeve electrode therethrough in sealed fashion, the upper chargeable sleeve electrode being attachable to the upper end of the chargeable sleeve;

k. a first carbon slurry flow path comprising the lower right side inlet port, the separate first carbon slurry flow channel within the lower end cap, the first annular space, the separate first carbon slurry flow channel within the upper end cap, and the upper right side outlet port;

l. a feed solution flow path comprising the lower left side inlet port, the separate feed solution flow channel within the lower end cap, the second annular space, the separate treated solution channel within the upper end cap, and the upper left side outlet port;

m. a second carbon slurry flow path comprising the lower inlet port on the lower end cap, the separate annular second carbon slurry flow channel within the lower end cap, the third annular space, the separate annular second carbon slurry flow channel within the upper end cap, and the upper inlet port on the upper end cap;

B. pressurizing the feed water solution to a first pressure P1 and introducing it to the feed solution flow path;

C. applying a positive polarity to the upper and lower chargeable wire electrodes;

D. applying a negative polarity to upper and lower chargeable sleeve electrodes;

E. introducing the first carbon slurry into the first carbon slurry flow path at a second pressure P2;

F. introducing the second carbon slurry into the second carbon slurry flow path at a third pressure P3; and

G. directing the treated solution out the treated solution outlet port to a desired location.

10 . The method of claim 9 further comprising the steps of adjusting the first, second and third pressures so that P1>P2 and P1>P3.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 23, 2023
From: GARDINER, JACK C.
To: TDS SELECT, LLC
Reel/Frame 065021/0740 →
Continuity (2)
Provisional Application 63307627 · Feb 7, 2022
Related Publication 20230249134A1 · Aug 10, 2023
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