WO2023060541A1 - Membrane capacitive deionization electrode assembly, housing structure, module and liquid treatment method - Google Patents

Abstract

The present invention relates to a membrane capacitive deionization electrode assembly, a housing structure, a module and a liquid treatment method. The membrane capacitive deionization electrode assembly comprises a flexible anion electrode, an anion exchange membrane, a cation exchange membrane, a flexible cation electrode and a spacer, wherein the anion electrode comprises at least one anion electrode extension portion, which extends outwards from an edge of the anion electrode, and the cation electrode comprises at least one cation electrode extension portion, which extends outwards from an edge of the cation electrode, and the extension direction of the anion electrode extension portion is opposite to the extension direction of the cation electrode extension portion; and the cation electrode extension portion comprises a cation electrode connection portion, and/or, the anion electrode extension portion comprises an anion electrode connection portion, so as to facilitate the supply of power to the cation electrode and/or the anion electrode. The present invention has the advantages of reducing the structural complexity of a module, and guaranteeing low contact resistance and a sealed structure.

Description

Membrane capacitive deionization electrode assembly, housing structure, module and method for treating liquid technical field

The present invention relates to capacitive deionization technology, and in particular to membrane capacitance deionization electrode assembly, shell structure for electrode assembly, module comprising membrane capacitance deionization electrode assembly and shell structure and treatment using membrane capacitance deionization electrode assembly to be treated liquid method.

Background technique

Water scarcity is a growing problem due to economic development, population growth and climate change. Traditional seawater desalination technologies include electrodialysis (ED) and membrane distillation (MD), but both require high cost and energy consumption and cannot compete with the main technology of seawater desalination - reverse osmosis (RO). However, fouling and high pressure limit the application of reverse osmosis, especially when treating high hardness water, because the need for frequent replacement of reverse osmosis membranes and the use of high-pressure pumps increase capital and operating costs.

The capacitive deionization technology (CDI) currently developed is a desalination technology that saves energy, has good reproducibility, and has no secondary pollution. CDI uses porous carbon materials as electrodes. When brine flows between the electrodes, ions are adsorbed and fixed to the electrodes due to the force of the electric field, thereby reducing the content of brine.

Membrane capacitive deionization (MCDI) is an emerging desalination technology for seawater desalination and ion-selective removal and recovery. Compared with the traditional reverse osmosis membrane process and electrodialysis, MCDI has the advantages of low energy consumption, low chemical consumption, and high water recovery rate.

Contents of the invention

The present invention proposes a new technology to set and provide membrane capacitive deionization electrode assembly and its housing structure, as well as related modules and methods, so as to better set the structure of the electrode assembly to improve production capacity and facilitate wastewater filtration.

The present invention proposes a membrane capacitance deionization electrode assembly, the membrane capacitance deionization electrode assembly comprises,

a flexible anion electrode for attracting anions in the liquid to be treated in the channel;

an anion exchange membrane disposed adjacent to the anion electrode for passing anions and preventing passage of cations;

a cation exchange membrane separated from the anion exchange membrane by channels for allowing passage of cations and preventing passage of anions; and

a flexible cation electrode disposed adjacent to the cation exchange membrane for attracting cations in the liquid to be treated in the channel;

a spacer located in the flow path of the liquid formed between the anion exchange membrane and the cation exchange membrane for separating the anion exchange membrane from the cation exchange membrane and guiding the flow of the liquid ;

Wherein, the anion electrode includes at least one anion electrode extension extending outward from an edge in the anion electrode, wherein the cation electrode includes at least one cation electrode extension, the at least one A cation electrode extension extends outward from the edge of the cation electrode, and the extension directions of the anion electrode extension and the cation electrode extension are opposite to each other.

Wherein, the cation electrode extension includes a cation electrode connection portion, and/or the anion electrode extension includes an anion electrode connection portion, and the cation electrode connection portion is connected or integrated with the cation electrode extension and can be connected to the cation electrode extension. The cation electrode extension extends angularly inwardly, and the anion electrode connection portion is connected to or integral with the anion electrode extension and is capable of extending angularly inwardly from the anion electrode extension so as to be a cation electrode and/or anion electrode power supply.

In one aspect, the cation electrode extension includes an opening therein for the cation electrode, and/or the anion electrode extension includes an opening therein for the anion electrode, the openings for assisting the membrane capacitance removal. The ion electrode assembly is secured through the opening when installed.

In one aspect, the plectrum-shaped cation electrode connection is formed by cutting the cation electrode extension, and the plectrum-shaped anion electrode connection is formed by cutting the anion electrode extension.

In one aspect, the cation electrode and the cation electrode extension are graphite sheets or metal sheets, and the anion electrodes and the anion electrode extensions are graphite sheets or metal sheets.

In one aspect, the cationic electrode extension includes an edge opening for the cationic electrode at a location adjacent to or in communication with the opening of the cationic electrode extension; and/or the anionic electrode extension includes An edge opening for the anion electrode, the edge opening for the anion electrode is located adjacent to or in communication with the opening of the anion electrode extension.

In one aspect, the membrane capacitive deionization electrode assembly includes a through hole to allow treated liquid to flow out of the membrane capacitive deionization electrode assembly through the through hole.

The present invention also proposes a casing structure for an electrode assembly, the casing structure comprising

a top plate at the top;

the base plate at the bottom;

a peripheral case located between the top plate and the bottom plate and connected to peripheral portions of the top plate and the bottom plate, the top plate, the bottom plate and the peripheral case forming an inner space for an electrode assembly;

A positive part and a negative part, the positive part and the negative part are respectively located in the space enclosed by the outer casing, and the positive part and the negative part are respectively coupled with the positive pole and the negative pole of the power supply when in use, and are used to install the the electrode assembly is conductively coupled to the electrodes of the electrode assembly; and

at least two fixing structures, the fixing structures are made of non-conductive material, the fixing structures are respectively located in the space enclosed by the peripheral casing and spaced apart from the positive and negative components to help install the electrode assembly;

Wherein, the fixing structure includes an upper part and a lower part, the lower surface of the upper part is inclined, and the upper surface of the lower part is inclined and corresponds to the inclination of the lower surface of the upper part, so that the upper part can move along the The upper surface of the lower portion moves outwardly relative to the lower portion.

In one aspect, the housing structure further includes a plurality of fixing posts located in the inner space and between the positive part and the negative part to facilitate the installation of the electrode assembly.

In one aspect, the upper part of the fixing structure is fixed to the lower part at a displaced position relative to the lower part.

In an aspect, the upper part of the fixing structure includes holes for fixing the upper part to the lower part therethrough.

In one aspect, the holes include two circular holes and an elongated hole located between the two circular holes.

In one aspect, the inwardly facing surfaces of the positive and negative components are planar, and the surfaces of the fixing structure opposite the positive and negative components are planar.

In one aspect, the housing structure further includes gaskets located between the top plate and the peripheral housing or/and between the bottom plate and the peripheral housing.

In one aspect, the housing structure further includes a positive conductive device and a negative conductive device, the positive conductive device is coupled to the positive component, and the negative conductive device is coupled to the negative component.

In one aspect, the housing structure is connected to a positive conductive device coupled to the positive component via one of a top plate, a bottom plate, and a peripheral housing, and a negative conductive device is coupled to a negative conductive device via the top plate, bottom plate, and One of the peripheral housings is coupled to the negative component.

In one aspect, the positive conducting means and the negative conducting means are respectively coupled to the positive part and the negative part in a sealed manner to avoid contact with the liquid to be treated in the housing structure.

The present invention also proposes a module comprising at least one membrane capacitive deionization electrode assembly as described above and the aforementioned shell structure, the membrane capacitor deionization electrode assembly is arranged on the bottom plate, the anion electrode extension and/or Or the anion electrode connection part contacts the positive part of the casing structure, and the cation electrode extension and/or the cation electrode connection part contacts the negative part of the casing structure.

In one aspect, the number of membrane capacitance deionization electrode assemblies is two or more, and multiple membrane capacitance deionization electrode assemblies are stacked in sequence to form a group of membrane capacitance deionization electrode assemblies or multiple sets of membrane capacitance deionization electrodes An assembly, wherein each membrane capacitive deionization electrode assembly is arranged in the shell structure in a forward and reverse alternate flipping manner.

In one aspect, separators are also included, and multiple sets of membrane capacitive deionization electrode assemblies are arranged in a multi-layer structure, and each layer is separated by separators.

In one aspect, it also includes a top support plate, the main body of the top support plate includes at least one sealing part, the sealing part is a protrusion with a hollow part, by inserting at least one of the positive electrode conductive device and the negative electrode conductive device into the The hollow part, and the protrusion is embedded in the top opening of at least one of the positive and negative components, so that at least one of the positive and negative conductive devices is hermetically coupled with at least one of the positive and negative components.

In one aspect, the main body of the top support plate includes a plurality of installation recesses, and the installation recesses are used to snap the fixing post into the installation recesses during installation to facilitate positioning.

The present invention also proposes a method for processing the liquid to be treated by using the aforementioned membrane capacitor deionization electrode assembly or the aforementioned module, after the membrane capacitor deionization electrode assembly is energized, the liquid to be treated Liquid flows through the membrane capacitive deionization electrode assembly whereby anion- and cation-containing particles are adsorbed to the anion and cation electrodes.

Utilizing the MCDI electrode assembly, shell structure, module and method described in the present invention reduces the structural complexity of the module, solves the problem of low production efficiency, ensures low contact resistance and a sealed structure, and effectively realizes water desalination and waste water recycling and other functions.

Description of drawings

Exemplary embodiments of the present invention are described below with reference to the drawings. which shows:

FIG. 1 shows a schematic diagram of an electrode assembly for deionization according to an embodiment of the present invention, which is a membrane capacitive deionization (MCDI) electrode assembly.

FIG. 2 shows a schematic diagram of a module for the electrode assembly as shown in FIG. 1 according to an embodiment of the present invention.

Fig. 3 shows a schematic top view of a module including an MCDI electrode assembly according to an embodiment of the present invention.

FIG. 4 shows a schematic diagram of an example test cycle showing TDS variation during the cycle, according to an embodiment of the present invention.

Figure 5 shows a schematic diagram of a module including an MCDI electrode assembly according to an embodiment of the present invention.

Fig. 6 shows an enlarged structure diagram of a module according to another embodiment of the present invention.

Fig. 7 shows an exploded structure diagram of a module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention.

FIG. 8 shows an exploded view of the internal structure of a module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention.

FIG. 9 shows an assembled schematic view of the internal structure of a module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention.

Fig. 10 shows a schematic structural diagram of an assembled module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention, wherein only half of the module is shown to clearly show its interior.

Fig. 11 shows a schematic cross-sectional view of an assembled module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention.

Fig. 12 shows a schematic diagram of a monolithic electrode according to another embodiment of the present invention, wherein anion electrode extensions, anion electrode connections, cation electrode extensions, and cation electrode connections are shown.

13 shows a schematic diagram of a peripheral housing, positive component, negative component, positive conductive means, and negative conductive means in a module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention.

Fig. 14 shows an enlarged schematic view of the positive electrode component and the positive electrode conductive device in a module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention.

FIG. 15 shows a schematic front view of a separator in a module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention.

FIG. 16 shows a schematic rear view of a separator in a module including multiple sets of MCDI electrode assemblies according to another embodiment of the present invention.

Fig. 17 shows a schematic diagram of the internal structure in a module including only one set of MCDI electrode assemblies according to another embodiment of the present invention.

Figure 18 shows a schematic view of a bottom support plate of a module including an MCDI electrode assembly according to another embodiment of the present invention.

Fig. 19 shows an enlarged schematic diagram of a positive electrode conductive device of a module including an MCDI electrode assembly according to another embodiment of the present invention.

Explanation of reference signs

1-anion electrode, 101-anion electrode extension, 102-anion electrode connection, 103-opening, 104-edge opening, 2-anion exchange membrane, 3-spacer, 4-cation exchange membrane, 5-cation electrode , 501-cation electrode extension part, 502-cation electrode connection part, 503-opening, 504-edge opening;

9-top plate, 10-bottom plate, 11-positive conductive device, 12-peripheral housing, 13-gasket, 14-positive component, 15-positive side acrylic block, 16-positive side, 17-fixing column, 18-negative side acrylic Block, 19-basic block on the negative side, 20-negative parts, 21-negative conductive device, 22-screw nut, 23-screw nut, 24-water outlet, 25-water inlet;

1301-bottom surface, 1303-positioning component, 1304-positive side basic block, 1305-negative side basic block, 1307-protruding structure, 1309-through hole, 1311-depression, 601-separator, 603-flexible electrode sheet, 1001-electrode side, 1003-extension side, 1005-opening, 1007-open opening, 1009-through hole, 607-positive component, 608-negative component, 609-installation top plate, 611-peripheral casing, 605 -acrylic block, 615-bottom plate, 617-top plate, 619-top support plate, 621-positive side foundation block, 623-connecting strip;

1101-positive conductive device, 1103-negative conductive device, 1105-first recess, 1107-second recess, 1109-gasket, 1111-gasket, 1601-main body, 1603-installation depression, 1605-sealing part, 1607- through hole.

Detailed ways

The detailed description set forth below is intended to describe various configurations of the subject technology, and is not intended to represent only configurations that the subject technology may take. The accompanying drawings are incorporated herein and constitute a part of the detailed description. The detailed description includes specific details in order to provide a thorough understanding of the subject technology. It will be apparent, however, to one skilled in the art that the subject technology is not limited to the specific details described herein and may be practiced using one or more embodiments. In one or more instances, structures and components are shown in block diagram form in order to avoid obscuring concepts of the subject technology. One or more embodiments of the present disclosure are illustrated by and/or described in connection with one or more figures.

One embodiment of the present invention relates to an MCDI electrode assembly. As shown in FIG. 1, the MCDI electrode assembly includes a multilayer mechanism to deposit anions and cations of a medium flowing therethrough, such as a liquid medium. The MCDI electrode assembly includes an anion electrode 1, which can be fabricated by coating carbon paste on a graphite sheet. The carbon paste is formed by mixing activated carbon, carbon black, and polyvinylidene fluoride into 1-methyl-2-pyrrolidone (NMP) solvent. The carbon coating formed by coating carbon paste on the graphite sheet, the graphite sheet and its carbon coating can be in the shape of rectangle, square, parallelogram, hexagon, octagon, circle, ellipse, etc., depending on the required Electrode assembly and module shape. In this embodiment, the graphite sheet and its carbon coating are rectangular, with a length of 10-50cm, 15-45cm, 20-40cm, 25-35cm, etc., and a width of 5-40cm, 10-35cm, 15-30cm , 20-25cm, etc., for example, its area is 23×19cm ² . Of course, the length and width can also be set larger or smaller as required.

As shown in Figure 1, on the side of the graphite sheet of the present embodiment, an anion electrode extension 101 extending along the long side of the graphite sheet as an anion electrode and a cation electrode extension 101 extending from the other side of the cation electrode are also included 501, the size of the extension can be slightly smaller or smaller than the graphite sheet, for example, its length is 5-30cm, 9-25cm, 12-20cm, 15-18cm, etc., and its width is 2-20cm, 6-16cm, 10-15cm , 12-14cm, etc., for example, its area is 5×8cm ² . Of course, the length and width can also be set larger or smaller as required. The interior of the sheet-like extension optionally has an opening 103 through which a portion of the interior is connected or integrally connected at one end to an exterior portion of the extension and is separated at the other end, the portion of the interior of the extension can be Fold up or down to form the opening and the anion electrode connection part 102 . The opening 103 may be square to maximize the area of the graphite sheet. The opening can be in any suitable shape such as a circle, a rectangle, or a triangle, and the inscribed portion of the opening can be bent to curl up at an angle to the electrode to form a contact portion for power supply. In addition, the opening can also be used for the connection of the power supply circuit in addition to the fixing function. Of course, it is not necessary to have an opening. As shown in FIG. 1 , the anion electrode connecting portion 102 is folded towards the inside of the electrode assembly, so as to facilitate stacking of electrodes. Optionally, the anion electrode connection portion is formed by cutting the anion electrode extension to form an opening for the anion electrode and a pick portion for the anion electrode, the pick portion for the anion electrode being a part of the anion electrode extension. Preferably, in order to prevent the graphite sheet from being further torn by inward cutting when forming the connecting portion, an edge opening 104 is formed on the graphite sheet, for example, a punching hole is cut, and the diameter of the punching hole is the same as that of the anion electrode extension portion 101 and the anion electrode connection portion 102. The size is suitable, for example, a punching hole of 1-5mm is formed in the extension. The edge opening 104 may be located at the edge of the cut opening, at a location communicating with the opening, or at a location between two sides of the connecting portion. For example, the edge opening 104 can be located at the opening on one side of the side where the connecting portion is connected with the graphite sheet, at the openings on both sides of the side where the connecting portion is connected with the graphite sheet, and at the side where the connecting portion is connected with the graphite sheet. The openings on both sides of the graphite sheet, the middle position on the side where the connecting part is connected to the graphite sheet, etc. Preferably, the anion electrode also includes a through hole 6 to allow the treated fluid or liquid, such as water, to flow out of the MCDI electrode assembly through the through hole. The through hole of the anion electrode can be located in the center of the electrode, with a diameter of 0.5-5 cm, such as 1 cm, 2 cm, 3 cm, 4 cm, etc., or other positions, but is not limited thereto.

The MCDI electrode assembly also includes an anion exchange membrane 2 located below the anion electrode and stacked with it. The anion exchange membrane 2 is in the shape of a thin sheet, preferably the same shape as the anion electrode 1 . The anion-exchange membrane allows the passage of anions and blocks the passage of cations in the adsorption stage, preventing the desorption of the adsorbed anions; in the regeneration stage, the desorbed ions will not be re-adsorbed to the electrode due to the blocking of the ion-exchange membrane. The anion exchange membrane 2 can be made of suitable commercially available materials, such as CJMA-4 and CJMC-4 from Hefei Chemjoy Polymer Material Co., Ltd. In this embodiment, the anion exchange membrane is rectangular, and its shape and size can be the same as that of the anion electrode, or it can be arranged according to needs, for example, its length is 10-50cm, 15-45cm, 20-40cm, 25-35cm, etc. , the width is 5-40cm, 10-35cm, 15-30cm, 20-25cm, etc., for example, its area is 23×19cm ² . Preferably, the anion exchange membrane also includes openings to allow the treated medium, such as water, to flow out of the MCDI electrode assembly through the openings, which correspond to the openings of the anion electrode, for example may be located at the center of the electrode, with a diameter of 0.5-5cm, such as 1cm, 2cm, 3cm, 4cm, etc., not limited thereto.

The MCDI electrode assembly also includes a cation exchange membrane 4 and a cation electrode 5 corresponding to the anion electrode 1 and the anion exchange membrane 2 . The positive ion electrode 5 can also be formed by coating carbon paste on the graphite sheet. The carbon paste is as mentioned above, and its shape and structure preferably correspond to the negative ion electrode 1. Of course, other shapes can also be selected, such as rectangle, square, parallel Quadrilateral, hexagonal, octagonal, circular, elliptical and other shapes, depending on the shape of the electrode assembly and module required. The cation electrode 5 also includes a cation electrode extension 501 extending along the long side of the graphite sheet, and the cation electrode extension 501 may be located on the side opposite to the position of the anion electrode extension 101 of the anion electrode 1 . The size and size of the cation electrode extension 501 may correspond to the size and size of the anion electrode extension 101 , or may be different from the size and size of the anion electrode extension 101 . The size of the cationic electrode extension 501 can be slightly smaller or smaller than the graphite sheet as the cationic electrode, for example, its length is 5-30cm, 9-25cm, 12-20cm, 15-18cm, etc., and its width is 2-20cm, 6- 16cm, 10-15cm, 12-14cm, etc., for example, its area is 5×8cm ² . Of course, the length and width can also be set larger or smaller as required. The inside of the sheet-shaped cationic electrode extension 501 has an opening 503, through which a part of the inside is connected at one end or integrally connected with an outer part of the cationic electrode extension 501 and is separated at the other end, the cationic electrode extension A portion of the interior of 501 may be folded up or down to form the opening and cation electrode connection 502 . The opening can be in any suitable shape such as a circle, a rectangle, or a triangle, and the inscribed portion of the opening can be bent to curl up at an angle to the electrode to form a contact portion for power supply. In addition, the opening can also be used for the connection of the power supply circuit in addition to the fixing function. As shown in FIG. 1 , the cationic electrode connecting portion 502 is folded toward the inside of the electrode assembly, so as to facilitate stacking of electrodes. The cationic electrode connection part can also protrude from the cationic electrode extension part without an opening, as long as it can be sandwiched between the positive electrode part and the fixing part. In the absence of openings, the cation electrode connection may be integral with the cation electrode extension, or joined together in a suitable manner. Optionally, the cation electrode connection is formed by cutting the cation electrode extension to form an opening for the cation electrode and a plectrum for the cation electrode which is a part of the cation electrode extension. Preferably, in order to prevent the graphite sheet from being further torn by inward cutting when forming the cationic electrode connection part, an edge opening 504 is formed on the graphite sheet, for example, a punching hole is cut, and the diameter of the punching hole is adapted to the size of the extension part and the connection part, for example Form a punched hole of 1-5 mm in the extension. The edge opening 504 may be located at the edge of the cut opening, at a location communicating with the opening, or at a location between two sides of the connecting portion. For example, the edge opening 504 can be located at the opening on one side of the side where the cation electrode connection part is connected to the opening, at the openings on both sides of the side where the cation electrode connection part is connected to the graphite sheet, at the opening on the side where the cation electrode connection part is connected to the graphite sheet, The middle position of the side where the pieces are connected, etc. Preferably, the anion electrode also includes a through hole to allow the treated medium, eg water, to flow out of the MCDI electrode assembly through the through hole. The through hole of the anion electrode can be located at the center of the electrode or any other suitable position, with a diameter of 0.5-5 cm, such as 1 cm, 2 cm, 3 cm, 4 cm, etc., but not limited thereto. The connection part of the cation electrode, the extension part of the cation electrode and the connection part of the anion electrode and the extension part of the anion electrode can be made of graphite sheet or carbon cloth, which has conductivity and is not easy to be corroded in salt water, or can be other conductive materials

The MCDI electrode assembly also includes a cation exchange membrane 4 positioned above the cation electrode and stacked with it, and the cation exchange membrane 4 is similar to the anion exchange membrane 2 . The cation exchange membrane 4 is in the shape of a sheet, preferably the same shape as the cation electrode 5 . The cation exchange membrane allows the passage of cations and blocks the passage of anions in the adsorption stage, preventing the desorption of the adsorbed cations; in the regeneration stage, the desorbed ions will not be re-adsorbed to the electrode due to the barrier of the ion exchange membrane. The liquid to be treated is present between the cation exchange membrane and the anion exchange membrane. The cation exchange membrane 4 can be made of the same material as the anion exchange membrane, and is made of suitable commercially available materials, such as CJMA-4 and CJMC-4 from Hefei Chemjoy Polymer Materials Co., Ltd. In this embodiment, the cation exchange membrane is rectangular, and its shape and size can be the same as that of the cation electrode, or it can be set as required, for example, its length is 10-50cm, 15-45cm, 20-40cm, 25-35cm, etc. , the width is 5-40cm, 10-35cm, 15-30cm, 20-25cm, etc., for example, its area is 23×19cm ² . Preferably, the cation exchange membrane also includes openings to allow the treated medium, such as water, to flow out of the MCDI electrode assembly through the openings, which correspond to the openings of the cation electrode, for example may be located in the center of the electrode, with a diameter of 0.5-5cm, such as 1cm, 2cm, 3cm, 4cm, etc., not limited thereto.

The MCDI electrode assembly also optionally includes a spacer 3 between the cation exchange membrane and the anion exchange membrane, the spacer 3 is used to provide a flow path for the liquid to be treated, such as water, between the cation exchange membrane and the anion exchange membrane, It is a grid structure to facilitate the flow of water between the cation exchange membrane and the anion exchange membrane. The spacer 3 can be made of nylon, for example, or other suitable materials, and its size can be larger than, equal to, or smaller than the cation exchange membrane/anion exchange membrane. For example, the spacer is rectangular, such as its length is 10-50cm, 15-45cm, 20-40cm, 25-35cm, etc., and its width is 5-40cm, 10-35cm, 15-30cm, 20-25cm, etc., such as its area It is 23×19cm ² . Preferably, the spacer 3 also includes an opening to allow the treated medium, such as water, to flow out of the MCDI electrode assembly through the opening, which corresponds to the opening of the cation exchange membrane/anion exchange membrane, for example, it can be located at the The center has a diameter of 0.5-5cm, such as 1cm, 2cm, 3cm, 4cm, etc., and is not limited thereto.

In the working process, liquid or fluid, such as water, enters the MCDI electrode assembly from the outer edge of the spacer 3, flows through the spacer 3 between the cation exchange membrane and the anion exchange membrane, and then passes through the opening 6, The openings of the anion exchange membrane 2, the channels formed by the openings of the optional spacer 3 and/or the openings of the optional spacer 3, the openings of the cation exchange membrane 4, the openings in the cation electrode 5 Channel out.

FIG. 2 shows a housing structure for an electrode assembly according to an embodiment of the present invention. The module includes the following parts in a state where the electrode assembly is not installed. The shell structure includes a shell, and the shell includes a top plate 9, a bottom plate 10 opposite to the top plate and spaced at a certain distance, and a peripheral shell 12. The top plate and the bottom plate are connected through the peripheral shell 12 located outside the top plate, which can be detachable for easy replacement. , or be hermetically connected, such as by bolts, snap-fits, hinges, etc. For example, as shown in FIG. 2 , the top plate and the bottom plate are connected together by screws for sealing, and the number of screws is, for example, 10. Preferably, gaskets, such as non-conductive gaskets, such as silicone gaskets, are respectively provided at the joints between the peripheral shell and the top plate and the bottom plate, for waterproofing between the peripheral shell and the top plate and between the peripheral shell and the bottom plate seal.

The casing of the casing structure includes a positive electrode component 14 and a negative electrode component 20 . The positive electrode part is located on the inner side of the peripheral case, and the negative electrode part is located on the other inner side of the peripheral case opposite to the positive electrode part. The positive electrode component and the negative electrode component are respectively coupled to the external positive electrode conductive device 11 and the negative electrode conductive device 21 through two openings of the outer casing. As shown in FIG. 2 , a positive electrode component 14 in the form of a graphite block is coupled to a positive electrode conductive device 11 such as a positive electrode copper rod, and a negative electrode component 14 in the form of a graphite block is coupled to a negative electrode conductive device 21 such as a negative electrode copper rod. The openings of the outer casing can correspond to the size of the positive electrode conductive device 11 and the negative electrode conductive device 21 respectively, so that the positive electrode copper rod and the negative electrode copper rod can be accommodated therein, for example, the diameter is 1-10mm, 2-9mm, 3-8mm , 4-7mm, 5-6mm, etc. The positive electrode conductive device 11 is connected to the positive electrode component 14 after passing through the outer casing, such as a graphite block. Optionally, the positive electrode conductive device 11 and the positive electrode component 14 are screwed together by screw nuts 22 to strengthen the connection between the positive electrode conductive device 11 and the positive electrode component 14. contact between. The negative electrode conductive device 21 is connected to the negative electrode component 20 after passing through the peripheral casing, such as a graphite block. Optionally, the negative electrode conductive device 21 and the negative electrode component 20 are connected together by screws and nuts 23 to strengthen the negative electrode conductive device 21 and the negative electrode component. 20 contacts between. The positive part, the negative part, the positive conductive means, and the negative conductive means are only differential representations, which can be indirectly coupled to one of the positive ion electrode and the negative ion electrode of the MCDI electrode assembly according to the situation. When there are a plurality of MCDI electrode assemblies, the plurality of MCDI electrode assemblies are arranged upside down sequentially. For example, the positive part is connected with a plurality of anion electrodes whose serial number is an odd MCDI electrode assembly and a plurality of anion electrodes whose serial number is an even MCDI electrode assembly and which is located below; The lower cationic electrode and the upper cationic electrode with a plurality of even-numbered MCDI electrode assemblies, and so on. For example, the positive part is connected to the upper anion electrode of the first MCDI electrode assembly, the lower anion electrode of the second MCDI electrode assembly, and the upper anion electrode of the third MCDI electrode assembly; the negative part is connected to the first MCDI The lower cation electrode of the electrode assembly, the upper cation electrode of the second MCDI electrode assembly, the lower cation electrode of the third MCDI electrode assembly, and so on. Or connect in any other suitable way.

Optionally, gaskets 13 are respectively provided between the positive conductive device 14 , the negative conductive device 21 and the outer shell 12 to prevent liquid from contacting the positive conductive device 11 and the negative conductive device 21 . The washer 13 can be an insulating washer, preferably an elastic washer, such as a silicon washer, or any suitable material. In this embodiment, two silicon gaskets are used. The gasket 13 can completely cover and surround the positive conductive device 11 and the negative conductive device 21 , and is used to fix the total height of multiple sets of electrode sheets after stacking. Furthermore, the gasket can also be used to seal the positive current conductor 11 and the negative current conductor 21 against liquid.

The housing structure also includes at least two fixing structures located in the peripheral housing 12, the fixing structures being made of non-conductive material. As shown in the figure, the fixing structures are respectively located in the space enclosed by the peripheral casing and spaced apart from the positive and negative components to facilitate the installation of the electrode assembly. The fixed structure includes an upper part and a lower part, the upper part can move relative to the lower part, the lower surface of the upper part is inclined, and the upper surface of the lower part is inclined and corresponds to the inclination of the lower surface of the upper part, so that the upper part can move along the upper part of the lower part. The surface moves outward.

As shown in FIG. 5, a positive side acrylic block 15 for corresponding to the positive part representing the upper part of the fixing structure and a negative side acrylic block 18 for corresponding to the negative part representing the upper part of another fixing structure are respectively shown in the figure. express. The positive electrode side acrylic block 15 and the negative electrode side acrylic block 18 are located on the inside 7 of the positive electrode member 14 and the negative electrode member 20 respectively. The positive side base block 16 for supporting the positive side acrylic block 15 as the lower part of the fixed structure and the negative side base block 19 for supporting the negative side acrylic block 18 as the lower part of the fixed structure are respectively shown in FIG. 5 . As shown in FIG. 6 , the upper surface of the positive side base block 16 is inclined, and the lower surface of the positive side acrylic block 15 has a corresponding slope. The positive-side acrylic block 15 and the negative-side acrylic block 18 have angles extending upward at an angle of 5° to 30° along the direction toward the inside of the case so as to be aligned with the positive-side base block 16 and the negative-side base block on the bottom plate 1. The inclination of the upper surface of 19 matches.

When installing, first install the opening in the cationic electrode extension part on the positive side acrylic block 15, then place the cationic electrode connecting part in the gap between the positive part 14 and the positive side acrylic block 15, and then Move the acrylic block 15 on the positive side toward the outside along the upper surface of the basic block on the positive side, and then slide down until the positive electrode connection part is tightly abutted against the positive part 14 . A similar operation is performed for the negative side acrylic block 18 . After installation, the anion electrode connection part 102/cation electrode connection part 502 is sandwiched between the positive side acrylic block 15/the negative side acrylic block 18 and the positive part 14/the negative part 20, by the positive side acrylic block 15/the negative side acrylic block 18. Press the anion electrode connection portion 102/cation electrode connection portion 502 to the positive electrode member 14/negative electrode member 20 to realize strengthening the respective electrical connections between the anion electrode connection portion 102/cation electrode connection portion 502 and the positive electrode member 14/negative electrode member 20. touch. After connection, the anion electrode connection part 102 and the cation electrode connection part 502 will not have any displacement or vibration even at the maximum flow rate of the fluid. In this way, not only fixation but also contact conduction can be achieved by pressing the anionic electrode connection/cationic electrode connection, eg carbon paper, onto the positive/negative electrode component, eg graphite block. In this way, the requirement for extremely low contact resistance can be achieved, and the resistance can be guaranteed to be below 0.02 ohm, so that the component can operate effectively.

The positive side acrylic block 15 and the negative side acrylic block 18 are attached to the base plate 10 . The acrylic blocks can be mounted removable by screwing, snapping, gluing, etc., or by welding, hinged, etc. Optionally, the upper parts of the positive side acrylic block 15 and the negative side acrylic block 18 include holes for fixing the positive side acrylic block 15 and the negative side acrylic block 18 to the positive side base block 16 and the negative base through the holes Block 19. For example, the hole may be a hole located in the middle of the upper surface of the positive side acrylic block 15 and the negative side acrylic block 18 or a hole in another suitable position, allowing for example a screw to pass through the hole and tighten the bottom plate. The holes may be of any suitable shape, such as circular, oval, etc. For example, the holes may be in the form of waist holes, and the holes include circular holes on both sides and an elongated hole located between the two circular holes and communicating with the circular holes. For example, the hole may be in the form of a partially open hole on one side, so that the acrylic block 15 on the positive electrode side and the acrylic block 18 on the negative electrode side can be installed and fixed after being moved. The positive-side base block 16 and the negative-side base block 19 are located below the positive-side acrylic block 15 and the negative-side acrylic block 18 to support the positive-side acrylic block 15 and the negative-side acrylic block 18 . The positive-side basic block 16 and the negative-side basic block 19 are fixed to the base plate, for example, by one or more screws respectively or fixed by bonding points, welding points, hinge devices, snap-fit devices and the like. In this embodiment, the positive-side base block 16 and the negative-side base block 19 are glued on the bottom plate 10 to provide support for the positive-side acrylic block 15 and the negative-side acrylic block 18 respectively.

The surfaces of the positive and negative components facing the inside of the case structure are flat, and the surfaces of the positive side acrylic block 15 /negative side acrylic block 18 opposite to the positive component/negative component are flat. Thus, after placing the cationic electrode connection part between the positive electrode member 14 and the positive electrode side acrylic block 15, slide the positive electrode side acrylic block until it is tightly against the positive electrode member 14, so that the cationic electrode connection part, the positive electrode side acrylic block, The positive electrode component 14 is in contact with a large area, which reduces the contact resistance and maximizes the current. In the same way, after placing the anion electrode connection part between the negative electrode part 20 and the negative side acrylic block 18, slide the negative side acrylic block until it is tightly against the negative part 20, so that the anion electrode connection part, the negative side acrylic block, The negative electrode component 20 is in contact with a large area, which reduces the contact resistance and maximizes the current.

The distance between the positive electrode component 14 and the negative electrode component 20 and the acrylic block 15 on the positive electrode side and the acrylic block 18 on the negative electrode side can also be adjusted by adjusting the thickness of the gasket 13 .

Fig. 3 shows a schematic top view of a module including an MCDI electrode assembly according to an embodiment of the present invention, wherein the MCDI electrode assembly is placed in the middle of the module. As shown in Figure 3, the MCDI electrode assembly is fixedly installed on the base plate 10. In the present embodiment, the MCDI electrode assembly is fixed by 8 fixing columns 17 on the base plate 10 and makes the MCDI electrode assembly when the quantity of the MCDI electrode assembly is multiple. Multiple MCDI electrode assemblies aligned. When the electrode assembly is installed, the fixing column 17 defines the position of the MCDI electrode assembly by limiting the outer edge of the MCDI electrode assembly, and the fixing column 17 can also cooperate with other structural parts of the shell structure to fix other shells when the MCDI electrode assembly is stacked The location of the structure. Of course, instead of using the fixing column, other suitable fixing structures may be used for fixing. In order to assemble into a complete module, each MCDI unit will be placed one by one in sequence. For example, the first MCDI electrode assembly is placed in the order of cation electrode 5, cation exchange membrane 4, spacer 3, anion exchange membrane 2 and anion electrode 1 from bottom to top. The cation electrode extension 501 and the anion electrode extension 101 pass through the negative-side base block 19 and the positive-side base block 16 , respectively. The second MCDI electrode assembly is placed in the order of anion electrode 1, anion exchange membrane 2, spacer 3, cation exchange membrane 4 and cation electrode 5 from bottom to top, which is opposite to the order of the first MCDI electrode assembly. This prevents direct contact between the anion and cation electrodes and avoids short circuits. The number of MCDI electrode assemblies can be 1-20 pairs, such as 3-15 pairs, 5-10 pairs, etc., and is not limited to the above. In the installation process, first place a plurality of pairs of MCDI electrode assemblies, then turn the negative ion electrode connection part 102 and the positive ion electrode connection part 502 inwards, and then install the positive electrode part 14 and the negative part 20 and the positive electrode conductive device 11 and the negative electrode conductive device 21, which is circular, for example, to provide electrical contacts. Then, more MCDI electrode assemblies can be further stacked at the bottom, the number of which can be, for example, 3 to 15 pairs. When stacked, the inverted anion electrode connection portion 102 and cation electrode connection portion 502 are in contact with the positive electrode component 14 and the negative electrode component 20 . In the case of installing the MCDI electrode assembly, the connection between the anion electrode and the cation electrode of the electrode assembly is realized through the electrical contact between the anion electrode connection part 102 and the positive electrode part 14 respectively. The positive electrode part 14 coupled with the positive electrode conductive device 11 is in contact with the anion electrode connection part 102 at the anion electrode of the electrode assembly to realize the conduction of the anion electrode 1, and the negative electrode part 20 coupled with the negative electrode conductive device 21 is in contact with the anion electrode at the electrode assembly. The cation electrode connection part 502 at the cation electrode is in contact to enable the conduction of the cation electrode 5 . After all the MCDI electrode assemblies are placed, the anion electrode connection 102 and the cation electrode connection 502 are pressed onto the positive part 14 and the negative part 20 respectively using the positive side acrylic block 15 and the negative side acrylic block 18 . In this embodiment, two screws may be used to fix the positions of the acrylic blocks 15, 18. The top plate 9 is then placed on top of the module and the module is sealed with 10 bolts as shown in this embodiment. Of course, any other suitable way can also be used to seal the module, such as snap joint, welding, hinge, adhesive and so on. A medium such as water enters the MCDI electrode assembly through two water inlets 25 and flows radially through the spacer 3 before exiting the module through water outlets 24 . In addition, the module design is also suitable for stacking multiple MCDIs.

In operation of the MCDI module including the MCDI electrode assembly, water is pumped from the reservoir into the MCDI module by two peristaltic pumps. Water treated with the MCDI module can be analyzed using a conductivity probe. Based on the NaCl calibration, the output of the conductivity probe is converted to total dissolved solids. In this embodiment, the electrode assembly is powered by a DC power source. Of course, other suitable ways can also be used for power supply. The positive part 14 and the negative part 20 are connected to the positive conducting means 11 and the negative conducting means 21 respectively, either directly or via a conductive structure such as a cable. As shown in Figure 4, electrode voltage and conductivity were recorded as a function of time.

Another embodiment of the present invention relates to a stack structure of an MCDI electrode assembly and a related shell structure. As shown in FIG. 7, each MCDI electrode assembly is similar to the electrode assembly shown in FIG. 1, including a flexible anion electrode for attracting anions in the liquid to be treated in the channel. An anion exchange membrane, positioned adjacent to the anion electrode, is used to pass anions and block cations. The cation exchange membrane, separated from the anion exchange membrane by channels, serves to allow the passage of cations and block the passage of anions. and a flexible cation electrode disposed adjacent to the cation exchange membrane for attracting cations in the liquid to be treated in the channel. A spacer, located in the flow path of liquid such as water formed between the anion exchange membrane and the cation exchange membrane, for separating the anion exchange membrane from the cation exchange membrane and guiding the flow through the anion exchange membrane and the cation exchange membrane The flow of liquid in the membrane. Wherein, the anion electrode includes at least one anion electrode extension extending outward from the edge of the anion electrode, wherein the cation electrode includes at least one cation electrode extension extending outward from the edge of the cation electrode, and the anion electrode extension is in contact with the anion electrode. The extension directions of the positive ion electrode extension parts are opposite to each other. The extension part plays the role of conduction. In this stacked structure, multiple sets of electrode sheets are used, and each set of electrodes is connected in parallel, and conducts electricity through their respective cation electrode extension parts and anion electrode extension parts.

The cationic electrode extension includes a flexible cationic electrode connection and the anionic electrode extension includes a flexible anionic electrode connection connected to or integral with the cationic electrode extension and angled from the cationic electrode extension toward the side of the electrode assembly. Extending internally, the anion electrode connection portion is connected to or integral with the anion electrode extension and extends at an angle from the anion electrode extension towards the interior of the electrode assembly to facilitate powering the cation electrode and/or the anion electrode. The cation electrode connection part and the anion electrode connection part in this embodiment also include openings communicating with the outside, for setting the upper part of the fixing structure.

The material, shape, and size of the anion electrode, cation electrode, cation exchange membrane, and anion exchange membrane in the MCDI electrode assembly may be the same, similar, or different from those in the previous embodiments.

As shown in FIG. 7 , the stacked structure of the MCDI electrode assembly includes multiple layers of MCDI electrode assemblies spaced apart, and a 5-layer structure is shown in the figure. Each layer is separated by a partition 601 . The partition 601 is shown in FIGS. 15 and 16 . Separator 601 includes a bottom surface 1301 that is larger in size than the MCDI electrode assembly to carry the MCDI electrode assembly. A plurality of positioning parts 1303 are arranged on the separator, and the positioning parts are used to fix the position of the MCDI electrode assembly by abutting against the outer edge of the MCDI electrode assembly, so as to help install the electrode assembly. On the lowermost separator, a positive-side base block 1304 and a negative-side base block 1305 are provided for supporting the upper part of a fixed structure above them, such as a positive-side acrylic block and a negative-side acrylic block. The separator also optionally includes a plurality of raised structures 1307 for spacing the cation electrode extensions and anion electrode extensions of each layer, respectively, after installation. The middle of the partition includes a through hole 1309 to help media flow out. The back side of the partition includes a recess 1311, which corresponds to the position of the fixing post, so that when a plurality of partitions are installed, the fixing post contacts with the recess, snaps to position the partition.

As shown in Figure 17, when stacking, the MCDI electrode assemblies are turned over in turn, so that the positive ion electrodes of the first MCDI electrode assembly correspond to the anion electrode positions of the second MCDI electrode assembly, and the positive ion electrodes of the second MCDI electrode assembly Corresponds to the position of the anion electrode of the third MCDI electrode assembly, so that the MCDI electrode assemblies are stacked. The flexible electrode sheet 603 on the uppermost MCDI electrode assembly of each layer is used as the uppermost electrode on the top, and the separator 601 is used as a spacer structure. The structure of the flexible electrode sheet 603 is shown in FIG. 12 , including an electrode side portion 1001 , an extension side portion 1003 , an opening 1005 , an open opening 1007 and a through hole 1009 . The electrode side part 1001 is a rectangular structure, the extension side part 1003 is located on one side of the electrode side part, and the opening part 1005 is located in the extension side part 1003, which is used for allowing the acrylic block and the basic block in the fixed structure to pass through the opening part. The open opening 1007 is located on the side of the extended side portion opposite to the electrode side, and does not communicate with the opening, so that the positive and negative components pass through the open opening. The through hole portion 1009 is located in the middle of the electrode or other suitable parts for allowing fluid to flow in or out therefrom.

As shown in FIG. 8 and FIG. 9 , when stacking, a group of multiple MCDI electrode assemblies are sequentially arranged on the separator, and each of the group of MCDI electrode assemblies is sequentially turned over and stacked. Each group of MCDI electrode assemblies is provided as one layer, and in this embodiment, five layers of MCDI electrode assemblies can be stacked.

The outer housing of the MCDI electrode assembly includes at least two fixation structures located within the peripheral housing 607, the fixation structures being made of a non-conductive material. As shown in FIG. 6 and FIG. 7 , the fixing structures are respectively located in the space enclosed by the outer casing 607 and spaced apart from the positive electrode component 607 and the negative electrode component 608 to help install the electrode assembly. Positive and negative components can be interchanged, just to indicate their position, but not limited to use for positive or negative. The fixed structure includes an acrylic block 605 as the upper part and a positive side base block 621 (as shown in FIG. 8 ) as the lower part. One of the acrylic blocks can move relative to the positive side base block 621. The acrylic block is in the shape of a cuboid, and the bottom of the acrylic block is The surface is inclined, and the upper surface of the positive side base block is inclined and corresponds to the slope of the lower surface of the acrylic block, so that the acrylic block moves outward along the upper surface of the positive side base block. The fixing structure can be any suitable material that has good mechanical properties and is not easily corroded in a medium such as salt water. An acrylic block 605 can be placed through the openings of the cation electrode extension and the anion electrode extension of the multilayer MCDI electrode to help secure the multilayer electrode, and the acrylic block 605 also abuts against the outer edge of the separator to help secure the separator s position.

The two acrylic blocks 605 of the fixed structure are connected by a connecting strip 623, which is connected to the top surface of the base block on the positive side of the fixed structure, and the positive pole of the fixed structure is connected by providing a hole on the top surface and locking with the hole of the connecting bar Side foundation blocks.

The acrylic block 605 of the fixed structure is respectively located inside the positive electrode component 607 and the negative electrode component 608, for connecting the positive ion electrode extension portion and the negative ion electrode extension portion and/or the positive ion electrode connection portion and the anion electrode connection portion with the positive electrode component 607 and/or The negative electrode member 608 is in close, large-area contact. Wherein, the cation electrode extension part and the anion electrode extension part and/or the cation electrode connection part and the anion electrode connection part of the electrode assembly in each layer of the MCDI electrode assembly extend downward to clamp the two acrylic blocks 605 and the positive electrode of the fixed structure between component 607 and negative component 608. The clamped cation electrode extension part and the anion electrode extension part and/or the cation electrode connection part and the anion electrode connection part may overlap slightly in sequence. In the embodiment of FIG. 6 , with the cation electrode connection portion and the anion electrode connection portion being at an angle or preferably almost perpendicular to the cation electrode extension portion and the anion electrode extension portion, respectively, along the acrylic block 605 of the fixed structure relative to The surface of the MCDI electrode assembly as the outside is pressed against the surfaces of the positive part 607 and the negative part 608 as the inside. In order to maximize the contact, the surface of the acrylic block 605 of the fixed structure and the surfaces of the positive and negative components 607 and 608 as the inner side are preferably planar, and the maximum contact surface can be achieved during installation, such as the acrylic of the fixed structure The surface of the block 605 as the outer side is almost completely in contact with the surfaces of the positive electrode member 607 and the negative electrode member 608 as the inner side. The shapes of the other surfaces of the acrylic block 605 of the fixed structure and the other surfaces of the positive electrode component 607 and the negative electrode component 608 may be other suitable shapes, not limited to plane. The lower surface of the fixing structure is inclined, and the upper surface of the lower part has a corresponding slope. The acrylic block has a corner extending upward at an angle of 5° to 30° in a direction toward the inside of the case to match the slope of the upper surface of the lower portion.

The installed module including multiple groups of MCDI electrode assemblies is shown in Figures 10 and 11, wherein the top plate 617 and the bottom plate 615 are joined to the peripheral housing to package the module including the MCDI electrode assembly, the positive ion electrode connection part and the negative ion electrode connection part Sandwiched between the fixed structure on both sides (especially the upper part of the fixed structure, that is, the acrylic block) and the positive part 607 and the negative part 608, the acrylic block slides toward the outside on the upper surface of the basic block along the inclined lower surface, Until the anode part 607 and the anode part 608 are abutted, the cation electrode connection part and the anion electrode connection part closely contact the anode part 607 and the anode part 608 in a large area, reducing the contact resistance. The positive conducting means 11 and the negative conducting means 21 are respectively inserted into the positive part 607 and the negative part 608 for powering them. The MCDI electrodes are closely arranged to set as many MCDI electrodes as possible in a limited space to maximize ion removal. The cation electrode extension part and the anion electrode extension part can also be sandwiched between the fixing structures on both sides and the positive electrode component 607 and the negative electrode component 608 as required.

As shown in Figure 13 and Figure 14, the positive pole part 607 and the negative pole part 608, the positive pole part and the negative pole part are cylinders, and the connection part with the positive ion electrode and the negative ion electrode connection part and/or the positive ion electrode extension part and the negative ion electrode extension part inside it The surface of the external contact is flat to expand the contact area. The positive electrode conductive device 1101 and the negative electrode conductive device 1103 extend into the positive electrode component and the negative electrode component from the outside, eg from the top, or from other positions. Optionally, in this embodiment, the upper part of the positive electrode component has a first recessed part 1105, and the upper part of the negative electrode part has a second recessed part 1107, so that the raised sealing part 1605 of the top support plate is inserted into the first recessed part and The positive electrode conductive device 1101 and the negative electrode conductive device 1103 are in the second recess and sealed therein. Optionally, the anode component is connected to the outer casing through a gasket 1109 , and the negative electrode component is connected to the outer casing through another gasket 1111 , thereby being tightly connected to the casing. Certainly, the positive electrode conductive device 1101 and the negative electrode conductive device 1103 can also be connected to the positive electrode component and the negative electrode component in a suitable manner.

Top plate 617 and top support plate 619 are located on top, acrylic block 605 and connecting strip 623 of fixed structure. As shown in FIG. 18 , the top support plate 619 includes a main body 1601 , and the main body includes a plurality of installation recesses 1603 , and the installation recesses are used to snap the fixing post into the installation recesses during installation to facilitate positioning. The main body 1601 also includes a sealing portion 1605 , as shown in the figure, there are two sealing portions 1605 for sealingly coupling the positive electrode component and the negative electrode component with the external positive electrode conductive device and the negative electrode conductive device. Specifically, the sealing portion 1605 is a protruding structure with a hollow portion. The inner diameter of the hollow portion is preferably equivalent to the outer diameter of the positive conductive device and the negative conductive device for inserting the positive conductive device and the negative conductive device therein. The top support plate 619 also has a through hole 1607, so that the liquid to be treated enters through the through hole through the pipeline. During installation, as shown in FIG. 19 , the protruding sealing part is inserted into the first recess 1105 of the positive part and the second recess 1107 of the negative part to form a sealing structure, and the positive conducting device 1101 and the negative conducting device 1103 pass through. Through the hollow structure in the sealing part 1605, power is supplied to the positive electrode component and the negative electrode component, and at the same time, the sealing seal protects the positive electrode conductive device 1101 and the negative electrode conductive device 1103 from being eroded by the medium.

A bottom support plate is installed below the MCDI electrode assembly opposite to the top support plate. The bottom support plate is similar to the top support plate, and may also be slightly different.

The top plate 617 and the bottom plate 615 are arranged on the outside of the top support plate 619 and the bottom support plate 613, and the top plate 617 and the bottom plate 615 are connected by a peripheral shell 611 located on the outside thereof, which can be detachably connected for easy replacement, or connected in a sealed manner , such as sealing by bolts, sealing by snap-fits, sealing by hinges, etc. As shown in FIG. 7 , the top plate, the bottom plate, and the peripheral shell 611 are connected together by screws for sealing. Preferably, gaskets, such as non-conductive gaskets, such as silicone gaskets, are respectively provided at the seams where the peripheral shell is connected to the top support plate 619 and the bottom support plate 613, for use between the peripheral shell and the top support plate and Watertight seal between peripheral housing and bottom support plate.

During installation, multiple MCDI electrode assemblies are respectively arranged on each layer of MCDI electrode assemblies, and are arranged by overlapping. As shown in Figures 8 and 9, the anion electrode extensions and cation electrode extensions on each layer of the MCDI electrode assembly protrude toward both sides for power supply. A through hole is located in the middle of the MCDI electrode assembly to allow media flow. The two fixed structures are respectively located on both sides, and the upper part of the fixed structure respectively passes through the openings of a plurality of anion electrode extensions and cationic electrode extensions in the combination of the multilayer MCDI electrode assembly, and the lower surface of the upper part is connected with the upper part of the lower part of the fixed structure. surface contact. The positive part coupled with the positive conductive means is in contact with the alternating anion electrode connections and cation electrode connections and/or anion electrode extensions and cation electrode extensions of a plurality of MCDI electrode assemblies to achieve anion electrode/cation electrode Conductive, the negative electrode part coupled with the negative electrode conductive device on the other side is in contact with the alternating positive ion electrode connection part and negative ion electrode connection part and/or the positive ion electrode extension part and the negative ion electrode extension part of a plurality of MCDI electrode assemblies to realize the positive ion Conductivity of electrodes/anion electrodes.

According to an embodiment of the present invention, the MCDI module is tested in a constant current mode, wherein a constant current is applied with a DC power supply. Current densities such as 1.0 mA/cm ² , 1.5 mA/cm ² and 2.0 mA/cm ² can be applied. Influent TDS is nominally 2000ppm. At the beginning of the charging cycle, the TDS drops rapidly to _ΔTDS , where wastewater with a constant TDS (900ppm) can be collected as shown in Figure 4. Typically a charge cycle is performed during use until the electrode voltage reaches 1.4V, at which point the applied current is cut off for a few seconds and the outflow TDS slowly increases to the inflow TDS. Then apply a discharge current in the opposite direction to the charge current. The effluent TDS increases rapidly and remains constant again during the discharge phase.

In the MCDI module of the present invention, the design of the fixed structure divided into two parts, the positive part and the negative part, and the positive conductive device 11 and the negative conductive device 21 can effectively ensure that the contact resistance is lower than 24MΩ, as low as 8.5MΩ. When the number of electrodes is 19 pairs and the applied current is 8.3A, it can be ensured that during charging and discharging, the instantaneous voltage rise or fall is lower than 0.45V, even as low as 0.20V. When 19 pairs of electrodes are charged and discharged at a current of 16.6A and a speed of 880mL/min and the influent salinity of a single module is 2000ppm, the overall design of the module ensures that the salt adsorption capacity (SAC) is at least 10mg/g, and the charging efficiency (CE) of at least 80%. Using the device of the present invention, the SAC and CE of 19 pairs of electrodes are as high as 18mg/g and 85%, respectively.

The MCDI module of the present invention reduces the structural complexity of the module, solves the problem of low production efficiency, ensures low contact resistance between the power supply and a single electrode, ensures that the metal conductor is completely sealed, and ensures that the flow channel between the flow electrodes is uniform . By adopting the device and method of the present invention, applications such as groundwater desalination and wastewater recovery can be effectively realized, such as the recovery of power station sewage, washing wastewater or other industrial wastewater.

The term "comprising" used in this specification means "comprising at least part of". In interpreting each statement in this specification that contains the word "comprising", features other than or preceded by that word may also be present. Related terms such as "comprising" and "comprising" should be interpreted in the same way.

To those skilled in the art to which this invention pertains, many changes in construction and widely different embodiments and applications of this invention will be apparent to those skilled in the art to which this invention pertains without departing from the scope of the invention as defined by the appended claims. Obvious. The disclosure and description herein are purely illustrative and are not intended to be limiting in any way. Where a specific integer is mentioned herein as having known equivalents in the art to which this invention pertains, such known equivalents are deemed to be incorporated herein as if individually set forth.

As used herein, the term "and/or" means "and" or "or" or both.

In the description of this specification, reference may be made to subject matter not within the scope of the appended claims. The subject matter should be readily recognized by a person skilled in the art and may facilitate the practice of the invention as defined in the appended claims.

Although the present invention is generally defined as above, those skilled in the art will appreciate that the present invention is not limited thereto and that the present invention also includes embodiments exemplified by the following examples.

The foregoing description of the invention includes its preferred forms. Modifications may be made thereto without departing from the scope of the invention.

Claims (22)

1. A membrane capacitance deionization electrode assembly, characterized in that the membrane capacitance deionization electrode assembly comprises,

   a flexible anion electrode for attracting anions in the liquid to be treated in the channel;

   an anion exchange membrane disposed adjacent to the anion electrode for passing anions and preventing passage of cations;

   a cation exchange membrane separated from the anion exchange membrane by channels for allowing passage of cations and preventing passage of anions; and

   a flexible cation electrode disposed adjacent to the cation exchange membrane for attracting cations in the liquid to be treated in the channel;

   a spacer located in the flow path of the liquid formed between the anion exchange membrane and the cation exchange membrane for separating the anion exchange membrane from the cation exchange membrane and guiding the flow of the liquid ;

   Wherein, the anion electrode includes at least one anion electrode extension extending outward from an edge in the anion electrode, wherein the cation electrode includes at least one cation electrode extension, the at least one A cation electrode extension extends outward from the edge of the cation electrode, and the extension directions of the anion electrode extension and the cation electrode extension are opposite to each other.

   Wherein, the cation electrode extension includes a cation electrode connection portion, and/or the anion electrode extension includes an anion electrode connection portion, and the cation electrode connection portion is connected or integrated with the cation electrode extension and can be connected to the cation electrode extension. The cation electrode extension extends angularly inwardly, and the anion electrode connection portion is connected to or integral with the anion electrode extension and is capable of extending angularly inwardly from the anion electrode extension so as to be a cation electrode and/or anion electrode power supply.
2. The membrane capacitive deionization electrode assembly of claim 1, wherein the cation electrode extension includes an opening therein for the cation electrode, and/or the anion electrode extension includes an opening therein for the anion electrode. The opening is used to help the membrane capacitive deionization electrode assembly to be fixed through the opening during installation.
3. The membrane capacitive deionization electrode assembly according to claim 2, characterized in that the plectrum-shaped cation electrode connection portion is formed by cutting the cation electrode extension, and the plectrum-shaped anion electrode connection portion is formed by cutting the anion electrode extension.
4. The membrane capacity deionization electrode assembly according to any one of claims 1-3, characterized in that, the cation electrode and the cation electrode extension are graphite sheets or metal sheets, and the anion electrodes and the anion electrodes The electrode extension is a graphite sheet or a metal sheet.
5. Membrane capacitance deionization electrode assembly according to claim 2 or 3, is characterized in that,

   the cation electrode extension includes an edge opening for the cation electrode, the edge opening for the cation electrode being located adjacent to or in communication with the opening of the cation electrode extension; and/or

   The anion electrode extension includes an edge opening for the anion electrode at a location adjacent to or in communication with the opening of the anion electrode extension.
6. The membrane capacitance deionization electrode assembly according to any one of claims 1-3, characterized in that,

   The membrane capacitive deionization electrode assembly includes through holes to allow treated liquid to flow out of the membrane capacitive deionization electrode assembly through the through holes.
7. A casing structure for an electrode assembly, characterized in that the casing structure includes

   a top plate at the top;

   the base plate at the bottom;

   a peripheral case located between the top plate and the bottom plate and connected to peripheral portions of the top plate and the bottom plate, the top plate, the bottom plate and the peripheral case forming an inner space for an electrode assembly;

   A positive part and a negative part, the positive part and the negative part are respectively located in the space enclosed by the outer shell, and the positive part and the negative part are respectively coupled with the positive pole and the negative pole of the power supply when in use, and are used for installing the the electrode assembly is conductively coupled to the electrodes of the electrode assembly; and

   at least two fixing structures, the fixing structures are made of non-conductive material, the fixing structures are respectively located in the space enclosed by the peripheral casing and spaced apart from the positive and negative components to help install the electrode assembly;

   Wherein, the fixing structure includes an upper part and a lower part, the lower surface of the upper part is inclined, and the upper surface of the lower part is inclined and corresponds to the inclination of the lower surface of the upper part, so that the upper part can move along the The upper surface of the lower portion moves outward relative to the lower portion.
8. The casing structure according to claim 7, further comprising a plurality of fixing columns, the plurality of fixing columns are located in the inner space and between the positive electrode part and the negative electrode part to help the electrodes Component installation.
9. The housing structure according to claim 7, wherein the upper part of the fixing structure is fixed to the lower part at a position displaced from the lower part after the movement.
10. Housing structure according to any one of claims 7-9, characterized in that the upper part of the fixing structure comprises holes for fixing the upper part to the lower part through the holes.
11. The housing structure according to claim 10, wherein the holes include two circular holes and an elongated hole located between the two circular holes.
12. The casing structure according to any one of claims 7-9, characterized in that, the inner-facing surfaces of the positive and negative components are planes, and the surfaces of the fixing structure opposite to the positive and negative components Surfaces are flat.
13. The shell structure according to any one of claims 7-9, characterized in that the shell structure further comprises a gasket, and the gasket is located between the top plate and the peripheral shell or/and between the bottom plate and the peripheral shell.
14. The casing structure according to any one of claims 7-9, characterized in that, the casing structure further comprises a positive conductive device and a negative conductive device, the positive conductive device is coupled to the positive component, and the negative conductive device Coupled with the negative part.
15. The casing structure according to any one of claims 7-9, wherein the casing structure is connected to a positive conductive device and a negative conductive device, and the positive conductive device is connected to one of the top plate, the bottom plate and the peripheral casing Coupled to the positive component, the negative conductive device is coupled to the negative component via one of the top plate, the bottom plate and the peripheral casing.
16. The casing structure according to claim 14, wherein the positive electrode conductive device and the negative electrode conductive device are respectively coupled to the positive electrode component and the negative electrode component in a sealed manner to avoid contact with the casing structure. contact with the liquid to be treated.
17. A module comprising at least one membrane capacitance deionization electrode assembly as claimed in any one of claims 1-6 and a housing structure as claimed in any one of claims 7-16, wherein the membrane capacitance deionization The ion electrode assembly is arranged on the bottom plate, the anion electrode extension and/or the anion electrode connection part contacts the positive part of the casing structure, and the cation electrode extension and/or the cation electrode connection part contacts the negative part of the casing structure.
18. The module according to claim 17, wherein the number of the membrane capacitor deionization electrode assemblies is two or more, and a plurality of membrane capacitor deionization electrode assemblies are stacked in sequence to form a group of membrane capacitor deionization electrodes An assembly or a plurality of membrane capacitive deionization electrode assemblies, wherein each membrane capacitive deionization electrode assembly is arranged in the shell structure in a forward and reverse alternately reversed manner.
19. The module according to claim 17, characterized in that it further comprises separators, multiple sets of membrane capacitive deionization electrode assemblies are arranged in a multi-layer structure, and each layer is separated by separators.
20. The module according to claim 17, further comprising a top support plate, the main body of the top support plate includes at least one sealing part, the sealing part is a protrusion with a hollow part, and the positive electrode conductive device and the negative electrode at least one of the conductive means is inserted into the hollow part, and the protrusion is embedded in the top opening of at least one of the positive part and the negative part, so that at least one of the positive conductive means and the negative conductive means is in contact with the positive part and the negative part At least one of the is hermetically coupled.
21. The module according to claim 20, wherein the main body of the top support plate includes a plurality of installation recesses, and the installation recesses are used for setting the fixing column to snap into the installation recesses during installation to help positioning.
22. A method for treating liquid to be treated by using the membrane capacitive deionization electrode assembly according to any one of claims 1-6 or the module according to any one of claims 17-21, characterized in that ,

    After the membrane capacitive deionization electrode assembly is energized, the liquid to be treated is caused to flow through the membrane capacitive deionization electrode assembly so that particles containing anions and cations are adsorbed to the anion electrodes and cation electrodes.

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