1. A roll-type bipolar membrane filter element is characterized in that: the bipolar membrane comprises at least one pair of electrode groups and a membrane structure formed by winding more than one bipolar membrane, wherein the electrode groups at least comprise one porous electrode, each bipolar membrane is formed by a cation exchange membrane and an anion exchange membrane which are attached together, and no flow channel is arranged between the cation exchange membrane and the anion exchange membrane which form the same bipolar membrane.

2. The rolled bipolar membrane cartridge of claim 1, wherein: one electrode is positioned at the central position, more than one bipolar membrane is overlapped together and radially wound on the electrode positioned at the central position to form a spiral membrane structure, and the other electrode is sleeved outside the membrane structure.

3. The rolled bipolar membrane cartridge of claim 2 wherein: the electrode positioned at the central position is columnar; or

The electrode is a solid electrode formed by winding a sheet-shaped electrode; or

The electrode wire is coiled into a spiral shape; or

Is hollow or non-hollow cylindrical.

4. The rolled bipolar membrane cartridge of claim 2 wherein: the electrode sleeved outside the membrane structure is cylindrical, elliptic cylindrical, square cylindrical, triangular cylindrical or irregular cylindrical; or

Is a spiral coiled by the electrode wire.

5. The rolled bipolar membrane cartridge of claim 2 wherein: the electrode sleeved on the outer side of the membrane structure is cylindrical, and the axis of the outer electrode is superposed with the axis of the electrode at the central position.

6. The rolled bipolar membrane cartridge of claim 1, wherein: one electrode of the pair of electrode groups is positioned at the central position, the other electrode is sleeved outside the membrane structure, a cavity is formed between the two electrodes, each bipolar membrane is cylindrical and sleeved layer by layer to form the membrane structure, and the membrane structure is integrally assembled in the cavity.

7. The rolled bipolar membrane cartridge of claim 6, wherein: the electrode positioned at the central position is columnar; or

The electrode is a solid electrode formed by winding a sheet-shaped electrode; or

The electrode wire is coiled into a spiral shape; or

Is hollow or non-hollow cylindrical.

8. The rolled bipolar membrane cartridge of claim 6, wherein: the electrode sleeved outside the membrane structure is cylindrical, elliptic cylindrical, square cylindrical, triangular cylindrical or irregular cylindrical; or

Is a spiral coiled by the electrode wire.

9. The rolled bipolar membrane cartridge of claim 6, wherein: the electrode sleeved on the outer side of the membrane structure is cylindrical, and the axis of the outer electrode is superposed with the axis of the electrode at the central position.

10. The rolled bipolar membrane cartridge of claim 1, wherein: the two electrodes are flexible, and are laminated in sequence according to the order of the electrodes, at least one bipolar membrane and the other electrode, and are integrally wound to form the sandwich roll type bipolar membrane filter element.

11. The rolled bipolar membrane cartridge of claim 1, wherein: the electrode before winding is wholly or partially overlapped with the bipolar membrane.

12. The rolled bipolar membrane cartridge according to any one of claims 1 to 11, wherein: the bipolar membrane.

13. The rolled bipolar membrane cartridge according to any one of claims 1 to 11, wherein: the porous electrode is provided with a porous material.

14. The rolled bipolar membrane cartridge of claim 13 wherein: the porous material has a porous structure with pore sizes between 0.5 and 50 nanometers.

15. The rolled bipolar membrane cartridge of claim 13 wherein: the porous material is one or more of activated carbon, carbon black, carbon nanotubes, graphite, carbon fibers, carbon cloth, carbon aerogel, metal powder, metal oxides and conductive polymers.

16. The rolled bipolar membrane cartridge of claim 13 wherein: the porous electrode is also provided with a current collector which is laminated with the porous material.

17. The rolled bipolar membrane cartridge of claim 16, wherein: the material of the current collector is selected from one or more of metal, metal alloy, graphite, graphene, carbon nanotube and conductive plastic.

18. The rolled bipolar membrane cartridge of claim 13 wherein: the porous electrode is also provided with an ion exchange membrane, and the porous material and the ion exchange membrane are arranged in a stacked mode.

19. The rolled bipolar membrane cartridge according to claim 18, wherein: the ion exchange membrane in the porous electrode is an anion exchange membrane or a cation exchange membrane.

20. The rolled bipolar membrane cartridge of claim 19 wherein:

a porous electrode having a cation exchange membrane, defined as an anode membrane electrode; the other porous electrode has an anion exchange membrane, defined as a negative membrane electrode;

the anion-exchange membrane in the bipolar membrane closest to the anode electrode faces the anode electrode;

the cation-exchange membrane in the bipolar membrane closest to the cathode electrode faces the cathode electrode.

21. A roll-type bipolar membrane electrodeionization device is characterized in that: with a rolled bipolar membrane cartridge according to any one of claims 1-20.

22. A water treatment apparatus characterized by: with a rolled bipolar membrane cartridge according to any one of claims 1-20.

Background

In the traditional electrochemical deionization device, a flow channel between an electrode and an ion exchange membrane is an electrode water chamber, wherein oxidation reaction is carried out in an anode chamber to generate oxygen, anode water is acidic, and the anode is easily corroded; the reduction reaction is carried out in the cathode chamber to generate hydrogen, cathode water is alkaline, and scaling is easy to form on the cathode. Therefore, the generation of gas and scale causes an increase in the voltage drop in the polar water chamber, making the device unstable in operation and less efficient overall. In addition, the electrode chamber of the electrochemical deionization device does not have the desalting function, and the liquid flow passing through the electrode chamber is separately drawn out in the design generally, so that the pollution to the pure water is prevented. In order to prevent the liquid flow of the electrode chamber from entering the pure water flow, the requirement on the sealing property of the flow channel of the filter element is high, the flow channel is complex in design, and the cost is high. In addition, the design needs to consider the exhaust problem of the polar chamber flow passage to prevent the gas from being held in the flow passage. In a word, the electrode chamber makes the structural design of electrochemical deionization become very complicated, once the control is not good, the desalting performance is reduced, even the water flow is blocked, the electrode is burnt and the like.

Therefore, it is necessary to provide a rolled bipolar membrane filter element, an electrodeionization device having the same, and a water treatment apparatus thereof to overcome the deficiencies of the prior art.

Disclosure of Invention

The invention aims to avoid the defects of the prior art and provides a roll-type bipolar membrane filter element, an electrodeionization device with the filter element and water treatment equipment, which can avoid the problems of gas generation and scaling caused by hydrolysis of water in polar chamber water in the prior art, and can improve the desalination rate, the water production rate is high, and the water resource waste is less.

The object of the invention is achieved by the following technical measures.

The roll type bipolar membrane filter element comprises at least one pair of electrode groups and a membrane structure formed by winding more than one bipolar membrane, wherein each electrode group at least comprises one porous electrode, each bipolar membrane is composed of a cation exchange membrane and an anion exchange membrane which are attached together, and no flow channel exists between the cation exchange membrane and the anion exchange membrane which form the same bipolar membrane.

Preferably, in the rolled bipolar membrane filter element, one electrode is located at the central position, more than one bipolar membrane is stacked together and radially wound around the electrode located at the central position to form a spiral membrane structure, and the other electrode is sleeved outside the membrane structure.

Preferably, in the rolled bipolar membrane filter element, the electrode located at the central position is columnar; or

The electrode is a solid electrode formed by winding a sheet-shaped electrode; or

The electrode wire is coiled into a spiral shape; or

Is hollow or non-hollow cylindrical.

Preferably, in the rolled bipolar membrane filter element, the electrode sleeved outside the membrane structure is cylindrical, elliptic cylindrical, square cylindrical, triangular cylindrical or irregular cylindrical; or

Is a spiral coiled by the electrode wire.

Preferably, in the rolled bipolar membrane filter element, the electrode sleeved outside the membrane structure is cylindrical, and an axis of the outer electrode coincides with an axis of the central electrode.

Preferably, in the rolled bipolar membrane filter element, one electrode of the pair of electrode groups is located at the center, the other electrode is sleeved outside the membrane structure, a cavity is formed between the two electrodes, each bipolar membrane is cylindrical and sleeved layer by layer to form the membrane structure, and the membrane structure is integrally assembled in the cavity.

Preferably, in the rolled bipolar membrane filter element, the electrode located at the central position is columnar; or

The electrode is a solid electrode formed by winding a sheet-shaped electrode; or

The electrode wire is coiled into a spiral shape; or

Is hollow or non-hollow cylindrical.

Preferably, in the rolled bipolar membrane filter element, the electrode sleeved outside the membrane structure is cylindrical, elliptic cylindrical, square cylindrical, triangular cylindrical or irregular cylindrical; or

Is a spiral coiled by the electrode wire.

Preferably, in the rolled bipolar membrane filter element, the electrode sleeved outside the membrane structure is cylindrical, and an axis of the outer electrode coincides with an axis of the central electrode.

In another preferred embodiment, the two electrodes are flexible, and the two electrodes, the at least one bipolar membrane and the other electrode are sequentially stacked and integrally wound to form the sandwich rolled bipolar membrane filter element.

Preferably, in the rolled bipolar membrane filter element, the electrode before being rolled and the bipolar membrane are wholly or partially overlapped.

Above, the above roll-up bipolar membrane cartridge, the porous electrode is provided with a porous material having a porous structure with a pore size between 0.5 and 50 nm.

Preferably, in the rolled bipolar membrane filter element, the porous material is one or more of activated carbon, carbon black, carbon nanotubes, graphite, carbon fibers, carbon cloth, carbon aerogel, metal powder, metal oxide and conductive polymer.

Preferably, in the rolled bipolar membrane filter element, the porous electrode is further provided with a current collector, and the current collector and the porous material are stacked.

Preferably, in the rolled bipolar membrane filter element, the material of the current collector is selected from one or more of metals, metal alloys, graphite, graphene, carbon nanotubes and conductive plastics.

Preferably, in the rolled bipolar membrane filter element, the porous electrode is further provided with an ion exchange membrane, and the porous material and the ion exchange membrane are stacked.

Preferably, in the rolled bipolar membrane filter element, the ion exchange membrane in the porous electrode is an anion exchange membrane or a cation exchange membrane.

Preferably, in the rolled bipolar membrane filter element, one porous electrode has a cation exchange membrane, and is defined as an anode membrane electrode; the other porous electrode has an anion exchange membrane, defined as a negative membrane electrode;

the anion-exchange membrane in the bipolar membrane closest to the anode electrode faces the anode electrode;

the cation-exchange membrane in the bipolar membrane closest to the cathode electrode faces the cathode electrode.

The invention also provides a roll type bipolar membrane electrodeionization device which is provided with the roll type bipolar membrane filter element.

The invention also provides water treatment equipment which is provided with the rolled bipolar membrane filter element.

The invention relates to a roll type bipolar membrane filter element, an electrodeionization device with the filter element and water treatment equipment with the electrodeionization device. The structure that porous electrode and bipolar membrane wound into book formula are adopted, can avoid among the prior art that the hydrolysis of utmost point room water produces gas and scale deposit's problem, and can improve the desalination, have the characteristics that the system water rate is high, the water waste is few.

Drawings

The invention is further illustrated by means of the attached drawings, the content of which is not in any way limiting.

Fig. 1 is a schematic structural diagram of a rolled bipolar membrane cartridge according to embodiment 1 of the present invention.

FIG. 2 is a schematic view of the section view "A-A" of FIG. 1 in a desalted state.

FIG. 3 is a schematic view of the section "A-A" of FIG. 1 in a regeneration state.

Fig. 4 is a schematic view of a section "a-a" of a rolled bipolar membrane cartridge of example 2 of the present invention in a desalted state.

Fig. 5 is a schematic view of a section "a-a" of a rolled bipolar membrane cartridge of example 2 of the present invention in a desalted state.

Fig. 6 is a top view of a rolled bipolar membrane cartridge of example 4 of the present invention.

Fig. 7 is a top view of a rolled bipolar membrane cartridge of example 5 of the present invention.

In fig. 1 to 6, there are included:

a roll-type bipolar membrane filter element 10,

A porous electrode 100,

A current collector 130, a porous material 110, an anion exchange membrane 120,

A porous electrode 200,

A current collector 230, a porous material 210, a cation exchange membrane 220,

Bipolar membrane 300, cation exchange membrane 310, anion exchange membrane 320.

Detailed Description

The invention is further illustrated by the following examples.

Unless clearly defined otherwise herein, the scientific and technical terms used have the meaning commonly understood by those of skill in the art to which this application pertains. As used in this application, the terms "comprising," "including," "having," or "containing" and similar referents to shall mean that the content of the listed items is within the scope of the listed items or equivalents thereof.

In the specification and claims, the singular and plural of all terms are not intended to be limiting unless the context clearly dictates otherwise. The use of "first," "second," and similar language in the description and claims of this application does not denote any order, quantity, or importance, but rather the intention is to distinguish one material from another, or embodiment.

Unless the context clearly dictates otherwise, the term "or", "or" does not mean exclusively, but means that at least one of the mentioned items (e.g. ingredients) is present, and includes the case where a combination of the mentioned items may be present.

References in the specification to "some embodiments" or the like indicate that a particular element (e.g., feature, structure, and/or characteristic) described in connection with the invention is included in at least one embodiment described in the specification, and may or may not be present in other embodiments. In addition, it is to be understood that the described inventive elements may be combined in any suitable manner.

Reference herein to "deionization" is to the removal of ions from the liquid to be treated, including anions and cations in various valence states. In most cases, "deionization" has the same meaning as "desalination". In some cases, deionization is also referred to as demineralization.

Example 1.

A roll type bipolar membrane filter element comprises at least one pair of electrode groups and a membrane structure formed by winding more than one bipolar membrane, wherein each electrode group at least comprises a porous electrode, each bipolar membrane is composed of a cation exchange membrane and an anion exchange membrane which are attached together, and no flow channel exists between the cation exchange membrane and the anion exchange membrane which form the same bipolar membrane.

The pair of electrode groups may be composed of two porous electrodes, or may be composed of one porous electrode and one common electrode. Common electrodes such as metal electrodes, titanium electrodes with ruthenium-yttrium coatings, ruthenium-yttrium electrodes, carbon electrodes, graphite electrodes, etc.

Among them, the porous electrode may be composed of a porous material, or a porous material and a current collector laminated, or a current collector, a porous material, and an ion exchange membrane laminated in this order. The ion exchange membrane is an anion exchange membrane or a cation exchange membrane, and when the ion exchange membrane is contained, the ion exchange membrane in the porous electrode is close to the bipolar membrane. The cation exchange membrane or the anion exchange membrane in the porous electrode can be flexibly selected according to actual needs.

The porous material may be any electrically conductive material having a large specific surface, e.g. a specific surface of more than 100m²Conductive material per gram. In some embodiments, the porous material is a hydrophobic, electrically conductive material. The porous material has a porous structure with pore sizes between 0.5 and 50 nanometers. The porous material can be an electric conductor prepared from one or more of activated carbon, carbon black, carbon nanotubes, graphite, carbon fibers, carbon cloth, carbon aerogel, metal powder (such as nickel), metal oxide (such as ruthenium oxide) and conductive polymer. In one embodiment, the porous material is a sheet or plate structure made of activated carbon and having a thickness in the range of 100 to 5000 micrometers, preferably 200 to 2,500 micrometers, and the pore size of the activated carbon sheet structure is between 0.5 to 20 nanometers, preferably 1 to 10 nanometers.

The porous electrode can reduce the scaling risk of the roll type bipolar membrane filter element. Since the ion exchange membrane contains or is adsorbed with ion charge units, when the amount of ions at the porous electrode is insufficient to complete the desorption process, the excess charge on the electrode is buffered by releasing the ions in the ion exchange membrane to help complete the desorption process. In this way, the risk of fouling is greatly reduced.

The current collector is used to connect to a wire or power source, also referred to as a "current collector". The current collector is formed of one or more materials selected from the group consisting of metals, metal alloys, graphite, graphene, carbon nanotubes, and conductive plastics. The current collector may be in any suitable form such as a plate, mesh, foil or sheet. In some embodiments, the current collector may be made of a metal or metal alloy, suitable metals include titanium, platinum, iridium or rhodium, etc., preferably titanium, and suitable metal alloys may be stainless steel, etc. In other embodiments, the current collector may be made of a conductive carbon material, such as graphite, graphene, carbon nanotubes, and the like. In other embodiments, the current collector is made of a conductive plastic material, such as a polyolefin (e.g., polyethylene), and conductive carbon black or metal particles, etc., may be mixed therein. In some embodiments, the current collector is a sheet or plate-like structure and may have a thickness in the range of 50 micrometers to 5 millimeters. In some embodiments, the current collector and the porous electrode have substantially the same shape and/or size.

When the porosity and conductivity of the porous material are sufficient, the current collector may not be provided when the porous material itself functions as the current collector.

The rolled bipolar membrane filter element of the embodiment can be composed of a plurality of electrode groups, and when the rolled bipolar membrane filter element comprises a plurality of electrode groups, the electrode groups can be connected in series or in parallel or in series-parallel or in parallel-series and parallel-parallel series-parallel connection mode for flow passage connection. In the present specification, the terms "in series" and "in parallel" are defined in consideration of the flow direction of the flow path liquid flow output liquid. For example, if two electrode sets are connected in series, the product fluid from the flow channel of the previous electrode set enters the flow channel of the next electrode set. For another example, if two electrode sets are connected in parallel, it means that the flow channels of the two electrode sets receive the same liquid. The series set of electrodes is used to further remove ions from the liquid, while the parallel set of electrodes is used to increase the throughput of the device.

The technical solution of the present invention will be described below by taking the rolled bipolar membrane filter element of fig. 1 to 3 as an example.

As shown in fig. 1, the rolled bipolar membrane cartridge 10 includes an electrode pair formed by a pair of porous electrodes 100 and 200, the electrode 100 is located at a central position, a bipolar membrane 300 is radially wound around the centrally located electrode 100 to form a spiral membrane structure, and the other electrode 200 is sleeved outside the membrane structure. The adjacent layers wound by the bipolar membranes of the membrane structure form a flow channel, and a layered structure is also formed between the electrode and the adjacent bipolar membranes.

In the present embodiment, the porous electrode 100 is formed by laminating the current collector 130 and the porous material 110, and the porous electrode 100 is a cathode film electrode. The porous electrode 200 is formed by sequentially laminating a current collector 230 and a porous material 210, and the porous electrode 200 is an anode membrane electrode. The porous electrode can be formed by laminating and clamping a current collector and a porous material together without using a binder; or may be fixed by thermal bonding or bonded by an adhesive. The cation exchange membrane or the anion exchange membrane in the porous electrode can be flexibly selected according to actual needs.

The bipolar membrane 300 is composed of a cation exchange membrane 310 and an anion exchange membrane 320 which are attached together, and the cation exchange membrane 310 and the anion exchange membrane 320 which form the same bipolar membrane are clamped tightly without a binder; the cation exchange membrane 310 and the anion exchange membrane 320 may be formed by thermal lamination. There is no flow channel between the cation exchange membrane 310 and the anion exchange membrane 320, and a flow channel is formed between the bipolar membrane or between the bipolar membrane and the electrode. The bipolar membranes sold in the market can be used as the bipolar membranes in the scheme, and the details are not repeated.

In this embodiment, when viewed along the section "a-a" in fig. 1, the bipolar membranes 300 between the porous electrodes 100 and 200 are four layers, and the arrangement directions of the four layers of bipolar membranes 300 are the same, which means that the cation exchange membranes 310 of each layer of bipolar membrane 300 are oriented in the same direction, and certainly the corresponding anion exchange membranes 320 of each layer of bipolar membrane 300 are also oriented in the same direction. It should be noted that the number of layers of the bipolar membrane 300 in the cross section formed after winding the bipolar membrane is not limited to four layers in this embodiment, and the number of layers of the bipolar membrane 300 between the general electrode pairs may be flexibly set according to actual needs, and is 1 to 50, or even more.

In this embodiment, the bipolar membrane is a single-layer bipolar membrane, but in practice, a plurality of bipolar membranes may be stacked, and the electrode 100 may be wound radially as a whole to form a spiral membrane structure. The number of the bipolar membranes stacked may be 2 or 3 or other numbers.

As shown in FIG. 2, in the roll type bipolar membrane filter element, in the desalination process, a cation exchange membrane of a bipolar membrane faces a positive electrode, and raw water is desalinated in a flow channel formed between two layers of the bipolar membrane. Anions in the raw water, e.g. Cl^-Moving toward the positive electrode to replace OH in the left anion exchange membrane^-，OH^-Entering a flow channel; with cations such as Na in the raw water⁺Moving toward the negative electrode to replace H in the cation exchange membrane of the bipolar membrane on the right side⁺Ion, H⁺Entering a flow channel; h⁺And OH^-Neutralization reaction occurs in the flow channel to generate water, so that salt in raw water is removed, and pure water is discharged from the tail end of the flow channel.

In the first flow channel formed by the porous electrode 100 and the adjacent bipolar membrane 300, and the two, which are applied with the forward voltage, the anions such as Cl in the raw water^-Moves towards the positive electrode and is adsorbed by the porous electrode 110, and simultaneously, cations such as Na + in the raw water move towards the bipolar membrane to replace H in the cationic membrane⁺And ions are used for removing salt in the raw water, and at the moment, the pure water discharged from the tail end of the flow passage is acidic. Similarly, in the second flow path formed by porous electrode 200 and adjacent bipolar membrane 300 for applying negative voltage and the two, the cation such as Na in the raw water⁺Moves toward the negative electrode and is adsorbed by the porous electrode 210; while Cl in the raw water^-Moving towards the bipolar membrane to replace OH in the cationic resin membrane^-And ions are used for removing the salt in the raw water, and at the moment, the pure water discharged from the tail end of the flow channel is alkaline. The pure water in the first flow passage and the pure water in the second flow passage are gathered together, H⁺And OH^-Water is generated by neutralization, and finally neutral pure water is formed.

When desalination is carried out for a period of time, reverse-pole regeneration is required to release ions in water adsorbed on the bipolar membrane. At this time, as shown in fig. 3, OH is generated in the interface layer of the cationic membrane and the anionic membrane of the bipolar membrane under the electric field^-And H⁺Ionic, cation inside cationic membrane of right bipolar membrane, e.g. Na⁺Quilt H⁺The ions are displaced and move to the negative electrode, and anions such as Cl in the anion membrane of the left bipolar membrane^-Is covered with OH^-The displacement toward the positive electrode, Na⁺、Cl^-And enters the flow channel to complete the regeneration.

At this time, in the first flow channel formed by the porous electrode 100 and the adjacent bipolar membrane 300 to which the negative voltage is applied and the two, the anions such as Cl adsorbed by the porous electrode 110^-Moving to the positive electrode, desorbing, and entering the flow channel; while Na inside the anode membrane of the bipolar membrane⁺Quilt H⁺Displacing the cathode towards the negative electrode and entering the flow channel; and discharging the salt-containing concentrated water out of the filter element to complete regeneration. Meanwhile, in the second flow path formed by the porous electrode 200 to which the positive voltage is applied, the adjacent bipolar membrane 300 and the two, the cation such as Na adsorbed in the porous electrode 210⁺Moving towards the negative electrode and entering a flow channel; while Cl inside the negative membrane of the bipolar membrane^-Is covered with OH^-Displacing, moving towards the positive electrode and entering a flow channel; and discharging the salt-containing concentrated water out of the filter element to complete regeneration.

When the roll type bipolar membrane filter element is used, the porous material is directly contacted with the flow channel, and the bipolar membrane between the porous electrodes is arranged in the same way. In the manner of this example, desalination and regeneration can be achieved. Under the desalting condition, the porous material can adsorb anions and cations in raw water, and has no selectivity and the adsorption efficiency of about 50 percent. Under the regeneration condition, anions and cations in the porous material can be desorbed into the flow channel to realize the regeneration.

When the roll-type bipolar membrane filter element is used for producing water, all single channels simultaneously produce water, and no concentrated water is produced. During regeneration, the regeneration can be realized by reversing the poles, and the regeneration process is also carried out in a single channel. Therefore, the spiral bipolar membrane filter element water path structure is simple.

The rolled bipolar membrane filter core repeatedly utilizes the membrane area of the bipolar membrane, and the speed and the efficiency of ion exchange are greatly improved by the electrolytic ion exchange mode. The roll type bipolar membrane filter core of the invention can not generate gas in polar water and can not cause scaling phenomenon.

So this formula of book bipolar membrane filter core adopts porous electrode and bipolar membrane's structure, can avoid among the prior art the problem that the pole water hydrolysis produced gas and scale deposit, and can improve the desalination, has the characteristics that the system water rate is high, the water waste is few.

In addition, experiments show that the porous electrode not only solves the problem of gas generation of the metal electrode, but also can realize the design of independent water outlet of the electrode chamber flow passage. And the whole desalting efficiency of the electrodeionization device adopting the porous electrode can be improved by more than 8 percent compared with that of the common electrode. This is because the porous electrode can adsorb ions of raw water, and this adsorption efficiency is higher than the ion exchange efficiency of the bipolar membrane.

The electrode 100 located at the center may be a columnar shape, a solid or hollow electrode formed by winding a sheet-shaped electrode, a spiral shape formed by coiling an electrode wire, a hollow or non-hollow cylindrical shape, or the like, and may be specifically selected according to actual conditions.

The electrode 200 sleeved outside the membrane structure may be cylindrical, elliptic cylindrical, square cylindrical, triangular cylindrical or irregular cylindrical, or may be spiral formed by coiling electrode wires, and the like, and may be selected according to actual situations, which are not listed herein.

Example 2.

A rolled bipolar membrane filter cartridge is otherwise characterized as in example 1, except that in this example: as shown in fig. 4 and 5, the porous electrode 100 is formed by stacking a current collector 130, a porous material 110, and an anion exchange membrane 120 in this order, and the porous electrode 100 is a cathode membrane electrode; the porous electrode 200 is formed by stacking a current collector 230, a porous material 210, and a cation exchange membrane 220 in this order, and the porous electrode 200 is an anode membrane electrode. The porous electrode can be formed by overlapping and clamping a current collector, a porous material and an ion exchange membrane together without using a binder; or may be fixed by thermal bonding or bonded by an adhesive.

The desalination process of the rolled bipolar membrane filter core of the embodiment is shown in fig. 4, in the desalination process of the rolled bipolar membrane filter core, the cation exchange membrane of the bipolar membrane faces the positive electrode, and raw water is desalinated in the flow channel formed between the two bipolar membranes. Anions in the raw water, e.g. Cl^-Moving toward the positive electrode to replace OH in the left anion exchange membrane^-，OH^-Entering a flow channel; with cations such as Na in the raw water⁺Moving toward the negative electrode to replace H in the cation exchange membrane of the bipolar membrane on the right side⁺Ion, H⁺Entering a flow channel; h⁺And OH^-Neutralization reaction occurs in the flow channel to generate water, so that salt in raw water is removed, and pure water is discharged from the tail end of the flow channel.

In the first flow channel formed by the porous electrode 100 and the adjacent bipolar membrane 300, and the two, which are applied with the forward voltage, the anions such as Cl in the raw water^-Moves towards the positive electrode and is adsorbed by the porous electrode 110, and simultaneously, cations such as Na + in the raw water move towards the bipolar membrane to replace H in the cationic membrane⁺And ions are used for removing salt in the raw water, and at the moment, the pure water discharged from the tail end of the flow passage is acidic. Similarly, in the second flow path formed by porous electrode 200 and adjacent bipolar membrane 300 for applying negative voltage and the two, the cation such as Na in the raw water⁺Moves toward the negative electrode and is adsorbed by the porous electrode 210; while Cl in the raw water^-Moving towards the bipolar membrane to replace OH in the cationic resin membrane^-And ions are used for removing the salt in the raw water, and at the moment, the pure water discharged from the tail end of the flow channel is alkaline. The pure water in the first flow passage and the pure water in the second flow passage are gathered together, H⁺And OH^-Water is generated by neutralization, and finally neutral pure water is formed.

When desalination is carried out for a period of time, reverse-pole regeneration is required to release ions in water adsorbed on the bipolar membrane. This is achieved byThen, as shown in FIG. 5, OH is generated in the interface layer of the cationic membrane and the anionic membrane of the bipolar membrane under the electric field^-And H⁺Ionic, cation inside cationic membrane of right bipolar membrane, e.g. Na⁺Quilt H⁺The ions are displaced and move to the negative electrode, and anions such as Cl in the anion membrane of the left bipolar membrane^-Is covered with OH^-The displacement toward the positive electrode, Na⁺、Cl^-And enters the flow channel to complete the regeneration.

At this time, in the first flow channel formed by the porous electrode 100 and the adjacent bipolar membrane 300 to which the negative voltage is applied and the two, the anions such as Cl adsorbed by the porous electrode 110^-Moving to the positive electrode, desorbing, and entering the flow channel; while Na inside the anode membrane of the bipolar membrane⁺Quilt H⁺Displacing the cathode towards the negative electrode and entering the flow channel; and discharging the salt-containing concentrated water out of the filter element to complete regeneration. Meanwhile, in the second flow path formed by the porous electrode 200 to which the positive voltage is applied, the adjacent bipolar membrane 300 and the two, the cation such as Na adsorbed in the porous electrode 210⁺Moving towards the negative electrode and entering a flow channel; while Cl inside the negative membrane of the bipolar membrane^-Is covered with OH^-Displacing, moving towards the positive electrode and entering a flow channel; and discharging the salt-containing concentrated water out of the filter element to complete regeneration.

When the roll-type bipolar membrane filter element is used for producing water, all single channels simultaneously produce water, and no concentrated water is produced. During regeneration, the regeneration can be realized by reversing the poles, and the regeneration process is also carried out in a single channel. Therefore, the spiral bipolar membrane filter element water path structure is simple.

The rolled bipolar membrane filter core repeatedly utilizes the membrane area of the bipolar membrane, and the speed and the efficiency of ion exchange are greatly improved by the electrolytic ion exchange mode. The roll type bipolar membrane filter core of the invention can not generate gas in polar water and can not cause scaling phenomenon.

So this formula of book bipolar membrane filter core adopts porous electrode and bipolar membrane's structure, can avoid among the prior art the problem that the pole water hydrolysis produced gas and scale deposit, and can improve the desalination, has the characteristics that the system water rate is high, the water waste is few.

In addition, experiments show that the porous electrode not only solves the problem of gas generation of the metal electrode, but also can realize the design of independent water outlet of the electrode chamber flow passage. And compared with the common electrode, the whole desalting efficiency of the electrodeionization device adopting the porous electrode can be improved by more than 10 percent, and the desalting efficiency is improved by a higher degree than that of the structure in the embodiment 1. This is because the porous electrode can adsorb ions of raw water, and this adsorption efficiency is higher than the ion exchange efficiency of the bipolar membrane. It can be seen that the electrodeionization apparatus of this example using porous electrodes is excellent in overall performance.

Example 3.

A rolled bipolar membrane cartridge, other features being the same as those of embodiment 1 or 2 except that: the porous electrode is not provided with a collector, and is formed only by laminating a porous material and an ion exchange membrane. The porous material of the present embodiment has a conductive property that satisfies the requirement of conductivity, and therefore, does not need to be provided with a collector.

It should be noted that the specific structure of the two porous electrodes can be flexibly set according to the need, for example, one porous electrode has a collector, the other porous electrode has no collector, or two porous electrodes have collectors at the same time or two porous electrodes have no collectors at the same time, as long as the actual need is met.

Example 4.

A rolled bipolar membrane cartridge, other features being the same as any one of embodiments 1 to 3 except that: one electrode of the pair of electrode groups is positioned at the central position, the other electrode is sleeved outside the membrane structure, a cavity is formed between the two electrodes, each bipolar membrane is cylindrical and sleeved layer by layer to form the membrane structure, and the membrane structure is integrally assembled in the cavity.

As shown in the roll type bipolar membrane filter element shown in FIG. 6, one electrode 100 is in the center position, the other electrode 200 and the four-layer bipolar membrane 300 form a cylinder respectively, and the four-layer bipolar membrane and the outer electrode 200 are concentric with the electrode 100 in the center position to form a structure surrounded layer by layer.

This formula of book bipolar membrane filter core adopts porous electrode and bipolar membrane's structure, can avoid among the prior art the problem that the pole water hydrolysis produced gas and scale deposit, and can improve the desalination, has the characteristics that the system water rate is high, the water waste is few.

It should be noted that the electrode 100 may be a columnar electrode, or a solid or hollow electrode 100 formed by winding a sheet-shaped electrode, or a spiral wound by an electrode wire, or a hollow or non-hollow cylinder, or the like, which may be specifically selected according to actual conditions.

The electrode 200 sleeved outside the membrane structure may be cylindrical, elliptic cylindrical, square cylindrical, triangular cylindrical or irregular cylindrical, or may be spiral formed by coiling electrode wires, and the like, and may be selected according to actual situations, which are not listed herein.

Example 5.

A rolled bipolar membrane cartridge, other features being the same as any one of embodiments 1 to 3 except that: the two electrodes are flexible, and are laminated in the order of the electrode 100, at least one bipolar membrane 300 and the other electrode 200, and integrally wound to form the sandwich roll type bipolar membrane filter element, as shown in fig. 7.

The two electrodes can be both in a sheet structure, before winding, the two electrodes in an unfolded state are integrally overlapped with the bipolar membrane, the two electrodes are overlapped into a layered structure according to the sequence of one electrode, at least one bipolar membrane and the other electrode, and the integral layered structure is wound from one end to form the sandwich roll-type bipolar membrane filter core.

Before winding, the two electrodes in the unfolded state may not partially overlap the bipolar membrane, so that the electrodes and the bipolar membrane can be arranged in a stacked manner to perform winding. For example, the inner electrode is formed in a filament shape, a wire electrode is laid on the bipolar membrane, and the inner wire electrode, the bipolar membrane, and the outer electrode are wound as a whole. After winding, the electrode wire can be formed into a section of cylinder, and also can be formed into a form of spiral-shaped electrode wire positioned on the outer layer of the bipolar membrane.

This formula of book bipolar membrane filter core adopts porous electrode and bipolar membrane's structure, can avoid among the prior art the problem that the pole water hydrolysis produced gas and scale deposit, and can improve the desalination, has the characteristics that the system water rate is high, the water waste is few.

Example 6.

A rolled bipolar membrane cartridge, other features being the same as any one of embodiments 1 to 5 except that: and at least one diversion net is arranged between the electrode and the bipolar membrane and between the bipolar membrane and the bipolar membrane. The diversion net material comprises net materials such as polypropylene, nylon, polyester and the like, and the thickness of the diversion net material is 0.05-2 mm. And a flow channel is formed through the flow guide net, so that the bipolar membrane filter core can accurately and effectively work.

Example 7.

A rolled bipolar membrane cartridge, other features being the same as any one of embodiments 1 to 6 except that: the filter element contains a bipolar membrane and a part of single cation exchange membrane and/or anion exchange membrane. The arrangement can realize the desalting function. Only a portion of the channels do not desalinate or regenerate the incoming water stream.

In this case, one arrangement is that the ion exchange membrane on one side of the filter element is sequentially arranged with the single cation exchange membrane and the anion exchange membrane in the order of the cation exchange membrane, the anion exchange membrane, the cation exchange membrane, and the anion exchange membrane. The operation in this case is the same as in embodiment 1.

In another arrangement, in the arrangement of the ion exchange membrane on one side of the filter element and the single cation exchange membrane and anion exchange membrane, two adjacent membranes belong to the same cation exchange membrane or the same anion exchange membrane, in this case, the flow channel formed by the ion exchange membranes of the same kind does not perform desalination or regeneration treatment on the liquid, and the other flow channels operate in the same manner as in example 1.

Example 8.

A rolled bipolar membrane cartridge, other features being the same as any one of embodiments 1 to 6 except that: the two porous electrodes are both provided with cation exchange membranes, and the bipolar membranes between the porous electrodes are arranged in the same manner. In this way, desalination and regeneration can be achieved, but the effect is inferior to examples 1 and 2, and in the desalination condition, the flow channel formed by the cation exchange membrane of the porous electrode and the cation exchange resin membrane side of the adjacent bipolar membrane only removes cations, but does not remove anions, and the effluent water quality is acidic. Under regeneration conditions, the cation exchange resin membrane of the bipolar membrane adjacent to the cation exchange membrane of the porous electrode is also regenerated. The other flow channels were desalted and regenerated in the same manner as in example 1 or 2.

Example 9.

A rolled bipolar membrane cartridge, other features being the same as any one of embodiments 1 to 6 except that: both porous electrodes are provided with anion exchange membranes, and the bipolar membranes between the porous electrodes are arranged in the same manner. In this way, desalination and regeneration can be achieved, but the effect is inferior to examples 1 and 2, and in desalination, the flow channel formed by the anion exchange membrane of the porous electrode and the anion exchange resin membrane side of the adjacent bipolar membrane only removes anions, but does not remove cations, and the effluent quality is alkaline. Under the regeneration condition, the flow channel formed by the anion exchange membrane of the porous electrode and the anion exchange resin membrane side of the adjacent bipolar membrane is also regenerated. The other flow channels were desalted and regenerated in the same manner as in example 1 or 2.

Example 10.

A bipolar membrane electrodeionization device having a rolled bipolar membrane filter cartridge as described in any one of embodiments 1 to 9. The bipolar membrane electrodeionization device comprises a filter element, a pipeline and a power supply, and can independently carry out desalination and regeneration on water. Due to the adoption of the porous electrode and the bipolar membrane and the winding structure of the bipolar membrane, the problems of gas generation and scaling caused by hydrolysis of water in an electrode chamber in the prior art can be solved, the desalination rate can be improved, and the method has the characteristics of high water production rate and less water resource waste.

Example 11.

A water treatment device having a rolled bipolar membrane cartridge according to any one of embodiments 1 to 10, which can be used for industrial or domestic water treatment. Examples of uses of industrial water treatment facilities mentioned herein include, but are not limited to, industrial sewage treatment, municipal sewage treatment, seawater desalination, brine treatment, river and lake water treatment, cheese whey demineralization, and the like. The industrial water treatment apparatus includes, in addition to the rolled bipolar membrane cartridge of an embodiment of the present invention, one or more of, for example, a flocculation and/or coagulation unit, an advanced oxidation unit, an adsorption unit, an electrolysis unit, a membrane separation unit (including one or more of microfiltration, ultrafiltration, nanofiltration and reverse osmosis).

The household water treatment device according to the embodiment of the present invention generally includes one or more of an ultrafiltration unit, a nanofiltration unit, an activated carbon adsorption unit, and an ultraviolet sterilization unit, in addition to the rolled bipolar membrane filter element, the pipeline, and the power supply device according to the embodiment of the present invention.

This water treatment facilities, its roll of formula bipolar membrane filter core adopt the structure of porous electrode and bipolar membrane, can avoid among the prior art problem that the hydrolysis of utmost point room water produced gas and scale deposit, and can improve the desalination, and the system water rate is high, and the water waste is few.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.