1. A composite filter element, which is characterized in that: is provided with a spiral wound type electrodeionization unit and at least one filtering unit which is assembled with the electrodeionization unit in a superposition way.

2. The composite filter element of claim 1, wherein: the electric deionization unit is connected with the water channel of the filtering unit in series, and the water outlet of the electric deionization unit is communicated with the water inlet of the filtering unit or the water outlet of the filtering unit is communicated with the water inlet of the electric deionization unit.

3. The composite filter element of claim 1, wherein: the filtering unit is single, and is assembled in the inner cavity of the electrodeionization unit or sleeved on the periphery of electrodeionization; or

The filtering units are multiple and are assembled in the inner cavity of the electrodeionization unit or sleeved on the periphery of the electrodeionization unit.

4. The composite filter element of claim 1, wherein: the electrodeionization unit is provided with a membrane structure formed by radially winding more than one bipolar membrane and a spiral flow channel formed by winding the bipolar membranes, wherein each bipolar membrane consists of a cation exchange membrane and an anion exchange membrane which are attached together.

5. The composite filter element of claim 2, wherein: after the bipolar membrane forming the membrane structure is unfolded, one side parallel to the central axis of the membrane structure is defined as the side edge of the bipolar membrane, and the other side perpendicular to the central axis is defined as the end edge; the water inlet of the electrodeionization unit is arranged on the side edge or the end edge, and the water outlet of the electrodeionization unit is arranged on the end edge or the side edge.

6. The composite filter element of claim 5, wherein: the middle cavity position of the membrane structure is provided with a functional channel which is communicated with at least one of a water inlet or a water outlet of a flow channel of the electrodeionization unit.

7. The composite filter element of claim 6, wherein: the functional channel is provided with at least one functional area, and at least one functional area is communicated with the flow channel of the electrodeionization unit.

8. The composite filter element of claim 7, wherein: the functional channel at least has two functional areas, and one functional area is communicated with the flow channel of the electrodeionization unit; the other functional area is in communication with the filter unit.

9. The composite filter element of claim 6, wherein: the functional channel is a central tube, and the central tube is provided with a through hole.

10. The composite filter element of claim 9, wherein: the filtering unit is arranged in the central tube, and a through hole arranged on the central tube is communicated with a flow channel of the electrodeionization unit;

liquid is introduced into the filtering unit, filtered by the filtering unit, enters a flow channel of the electrodeionization unit from a through hole of the central tube for desalination, and is discharged from a flow channel water outlet of the electrodeionization unit, wherein the flow channel water outlet of the electrodeionization unit is arranged on the side edge or the end edge of the bipolar membrane or at the through hole of the central tube; or

Liquid enters the filtering unit in the central tube through the through hole arranged in the central tube after desalination treatment from the water inlet of the flow channel of the electrodeionization unit, and is discharged from the water outlet of the central tube after being treated by the filtering unit.

11. The composite filter element of claim 2, wherein: the filtering unit is sleeved outside the membrane structure.

12. The composite filter element of claim 11, wherein: a channel for liquid circulation is arranged between the outer ring of the electric deionization unit membrane structure and the inner cavity of the filtering unit.

13. The composite filter element of claim 12, wherein: a separating piece is arranged between the membrane structure and the filtering unit, and a flow hole arranged on the separating piece forms a channel between the electrodeionization unit and the filtering unit.

14. The composite filter element of claim 2, wherein: the filtering unit and the electrodeionization unit are arranged in a stacked mode.

15. The composite filter element of claim 14, wherein: the device is provided with a central pipe, the central pipe at least comprises two sections of sub-pipes with through holes, and one section of the sub-pipe is communicated with a channel of the electrodeionization unit; the other section is communicated with the filtering unit.

16. The composite filter element of claim 15, wherein: the electrodeionization unit and the filtering unit are vertically arranged and are simultaneously sleeved on the central pipe, and the central pipe is simultaneously communicated with the flow channel of the electrodeionization unit and the filtering unit.

17. The composite filter element of claim 16, wherein: the water inlet and the water outlet of the electrodeionization unit are respectively arranged on the side edge and the central pipe of the electrodeionization unit, and the water inlet and the water outlet of the filtering unit are respectively arranged on the side edge and the central pipe of the electrodeionization unit.

18. The composite filter element of claim 17, wherein: the electrodeionization unit is the next stage water treatment unit of the filtration unit.

19. The composite filter element of any one of claims 1 to 18, wherein: the filtering unit is at least one of microfiltration, ultrafiltration, reverse osmosis, nanofiltration and active carbon.

20. A water treatment apparatus characterized by: a composite filter element according to any one of claims 1 to 20.

Background

Along with the improvement of living standard of people, the requirement on water quality is higher and higher, and correspondingly, higher requirements are also put forward on the performance of water purifying equipment.

The filter element is the key of water purification equipment, and the performance of the filter element directly determines the effect of water treatment. Besides removing heavy metals and other harmful charged ions, the household water purification device needs multiple purification of a plurality of filter elements arranged in front and at back to remove bacteria viruses and organic matters, needs to connect water pipelines between the filter elements, and is large in size, easy to leak water and complex to install.

Therefore, it is necessary to provide a composite filter element with simple structure, small size and high desalination efficiency, an electrodeionization unit with the filter element, and a water treatment device thereof to overcome the defects of the prior art.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a composite filter element and water treatment equipment with the same, which have the characteristics of simple structure, small volume and high desalination efficiency.

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

Provides a composite filter element which is provided with a spiral roll type electric deionization unit and at least one filtering unit which is assembled with the electric deionization unit in a superposition way.

Preferably, in the composite filter element, the electrodeionization unit is connected with the water channel of the filtering unit in series, and the water outlet of the electrodeionization unit is communicated with the water inlet of the filtering unit or the water outlet of the filtering unit is communicated with the water inlet of the electrodeionization unit.

Preferably, in the composite filter element, the filter unit is single, and the filter unit is assembled in an inner cavity of the electrodeionization unit or sleeved on the periphery of electrodeionization; or

The filtering units are multiple and are assembled in the inner cavity of the electrodeionization unit or sleeved on the periphery of the electrodeionization unit.

Preferably, in the composite filter element, the electrodeionization unit is provided with a membrane structure formed by radially winding more than one bipolar membrane and a spiral flow channel formed by winding the bipolar membranes, and each bipolar membrane is composed of a cation exchange membrane and an anion exchange membrane which are attached together.

Preferably, after the bipolar membrane constituting the membrane structure is unfolded, one side parallel to the central axis of the membrane structure is defined as a side edge of the bipolar membrane, and one side perpendicular to the central axis is defined as an end edge; the water inlet of the electrodeionization unit is arranged on the side edge or the end edge, and the water outlet of the electrodeionization unit is arranged on the end edge or the side edge.

Preferably, in the composite filter element, the middle cavity of the membrane structure is provided with a functional channel, and the functional channel is communicated with at least one of a water inlet and a water outlet of a flow channel of the electrodeionization unit.

Preferably, in the composite filter element, the functional channel is provided with at least one functional region, and at least one functional region is communicated with the flow channel of the electrodeionization unit.

Preferably, in the composite filter element, the functional channel at least has two functional areas, and one functional area is communicated with the flow channel of the electrodeionization unit; the other functional area is in communication with the filter unit.

Preferably, in the composite filter element, the functional channel is a central tube, and the central tube is provided with a through hole.

Preferably, in the composite filter element, the filter unit is installed in the central tube, and a through hole formed in the central tube is communicated with a flow channel of the electrodeionization unit;

liquid is introduced into the filtering unit, filtered by the filtering unit, enters a flow channel of the electrodeionization unit from a through hole of the central tube for desalination, and is discharged from a flow channel water outlet of the electrodeionization unit, wherein the flow channel water outlet of the electrodeionization unit is arranged on the side edge or the end edge of the bipolar membrane or at the through hole of the central tube; or

Liquid enters the filtering unit in the central tube through the through hole arranged in the central tube after desalination treatment from the water inlet of the flow channel of the electrodeionization unit, and is discharged from the water outlet of the central tube after being treated by the filtering unit.

In another preferred embodiment, in the composite filter element, the filtering unit is mounted on the periphery of the electrodeionization unit, and the filtering unit is sleeved outside the membrane structure.

Preferably, in the composite filter element, a channel for liquid circulation is arranged between the outer ring of the electrodeionization unit membrane structure and the inner cavity of the filter unit.

Preferably, in the composite filter element, a partition is arranged between the membrane structure and the filtering unit, and a flow hole formed in the partition forms a channel between the electrodeionization unit and the filtering unit.

In another preferred embodiment, in the composite filter element, the filtering unit and the electrodeionization unit are stacked.

Preferably, the composite filter element is provided with a central tube, the central tube at least comprises two sections of sub-tubes with through holes, and one section of the sub-tube is communicated with the channel of the electrodeionization unit; the other section is communicated with the filtering unit.

Preferably, in the composite filter element, the electrodeionization unit and the filter unit are vertically arranged and are simultaneously sleeved on the central tube, and the central tube is simultaneously communicated with the flow channel of the electrodeionization unit and the filter unit.

Preferably, in the composite filter element, the water inlet and the water outlet of the electrodeionization unit are respectively arranged on the side edge and the central pipe of the electrodeionization unit, and the water inlet and the water outlet of the filter unit are respectively arranged on the side edge and the central pipe of the electrodeionization unit.

Preferably, the composite filter element and the electrodeionization unit are lower water treatment units of the filter unit.

Preferably, the filtration unit of the composite filter element is at least one of microfiltration, ultrafiltration, reverse osmosis, nanofiltration and activated carbon.

The invention also provides water treatment equipment which is provided with the composite filter element.

The composite filter element and the water treatment equipment with the filter element are provided with a spiral wound type electrodeionization unit and at least one filtering unit which is assembled with the electrodeionization unit in a superposition mode. The invention assembles the electrodeionization unit and the filtering unit together to form the composite filter element, and has the advantages of simple structure, good pressure bearing performance, small volume and simple and convenient installation. The water purifying equipment based on the filter element has a simple structure, can realize multiple filtration by only one filter element, does not need a booster pump of a reverse osmosis desalination technology, and solves the problems of complex design, large volume and noise of the whole water purifying equipment.

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 view of a composite filter element according to embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of a composite filter element according to embodiment 2 of the present invention.

Fig. 3 is a schematic structural diagram of a composite filter element according to embodiment 3 of the present invention.

Fig. 4 is a schematic structural view of an electrodeionization unit according to embodiment 4 of the present invention.

Fig. 5 is a sectional view "B-B" of fig. 4.

FIG. 6 is a schematic illustration of the electrodeionization unit of FIG. 4 in a partially desalinated state.

FIG. 7 is a schematic illustration of the electrodeionization unit of FIG. 4 in a partially positioned regeneration state.

Fig. 8 is a schematic view of a multi-layer bipolar wound membrane configuration of example 4 of a bipolar membrane cartridge of the present invention.

FIG. 9 is a schematic diagram of the construction of an electrodeionization unit of example 5 of a bipolar membrane cartridge of the invention.

FIG. 10 is a schematic structural view of a porous electrode in example 6 of the bipolar membrane cartridge of the present invention.

In fig. 1 to 10, there are included:

10. an electrodeionization unit,

Electrode 100, electrode 200,

A bipolar membrane 300, a cation exchange membrane 310, an anion exchange membrane 320,

A membrane structure 30,

A central tube 500, a through hole 510,

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

Detailed Description

The invention is further illustrated by the following examples.

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 composite filter element is provided with a spiral roll type electric deionization unit and at least one filter unit which is assembled with the electric deionization unit in a superposition way.

The electrodeionization unit consists of a pair of electrodes, at least one layer of bipolar membrane and a flow channel, wherein the plurality of layers of bipolar membranes are radially wound to form a spiral wound membrane structure, and a middle cavity is formed in the center of the membrane structure. Typically one electrode is located in the central cavity of the membrane structure and the other electrode is located at the outer periphery of the membrane structure.

The electrodeionization unit can realize the adsorption of salt ions and remove heavy metals, nitrite, fluoride ions and the like in water. In order to further remove particulate matter, bacteria, viruses and organic matters, one or more filtering units, such as microfiltration, ultrafiltration, reverse osmosis, nanofiltration, activated carbon and the like, are superposed on the electrically-assisted desalting unit. Because most of the filter units are designed in a cylindrical mode, the spiral wound electric auxiliary filter element is designed to be matched with other filtering technologies more easily to form a multifunctional composite filter element.

According to the composite filter element, the electric deionization unit is connected with the water channel of the filtering unit in series, and the water outlet of the electric deionization unit is communicated with the water inlet of the filtering unit or the water outlet of the filtering unit is communicated with the water inlet of the electric deionization unit.

The "series" is determined based on the flow direction of the flow path liquid flow to the outlet liquid. For example, if two process units are connected in series, the produced fluid from the flow channel of the previous process unit enters the flow channel of the next process unit.

Through the mode of establishing ties for the liquid stream is handled through electrodeionization unit and filter unit respectively, improves the water purification effect.

It should be noted that the membrane forms a flow channel, only the inlet and outlet of the flow channel can pass through the flow channel, and other parts are sealing areas, which are in a sealing shape and can be sealed by means of sealing adhesive tapes or hot melt adhesives. This is common knowledge in the art, and the detailed description is not repeated in this embodiment.

Based on the appearance structure of the spiral-wound type electrodeionization unit and the filtering unit, the filtering unit can be assembled in the inner cavity of the electrodeionization unit, or the filtering unit can be sleeved on the periphery of the filtering unit.

The electrodeionization unit is provided with a membrane structure formed by radially winding more than one bipolar membrane and a spiral flow channel formed by winding the bipolar membranes, wherein each bipolar membrane consists of a cation exchange membrane and an anion exchange membrane which are attached together.

The middle cavity position of the membrane structure is provided with a functional channel which is communicated with at least one of a water inlet or a water outlet of a flow channel of the electrodeionization unit. The functional channel is provided with at least one functional area, and at least one functional area is communicated with the flow channel of the electrodeionization unit. The functional channel can also have at least two functional areas, and one functional area is communicated with the flow channel of the electrodeionization unit; the other functional area is in communication with the filter unit.

The functional channel may be a central tube, which is provided with openings as required depending on whether it is to be in communication with the flow channels. The functional channel can also be only a middle cavity formed in the process of spirally winding the bipolar membrane, a supporting structure made of plastic, metal or other materials and the like, and also can be a section of the bipolar membrane adopted in the process of winding the bipolar membrane as the functional channel.

The functional passage may be an inlet passage for raw water or a discharge passage for pure water, or both an inlet port for raw water and an outlet port for pure water, or only a supported or unsupported space or structure, etc. According to the function of the functional channel, the central tube can be provided with through holes or not, or divided into a plurality of subsections, and the subsections which need to realize liquid circulation are provided with the through holes.

As shown in fig. 1, in the composite filter element of this embodiment, at least one layer of bipolar membrane is radially wound around a central tube 500, the central tube 500 is provided with a through hole 510, the water inlet of the electrodeionization unit is on the outside, and the through hole 510 of the central tube is used as the water outlet. The filter unit is fitted within the central tube. Raw water enters the spiral flow channel from the outer side of the electrodeionization unit, reaches the through hole of the central pipe after desalination treatment, enters the filtering unit from the through hole, is filtered and then is discharged as pure water. This composite filter element, simple structure, composite filter element have gathered the dual filter effect of electrodeionization unit and filter unit, simple structure, and the pressure-bearing nature is good, small in size, simple installation. The water purifying equipment based on the filter element has a simple structure, can realize multiple filtration by only one filter element, does not need a booster pump of a reverse osmosis desalination technology, and solves the problems of complex design, large volume and noise of the whole water purifying equipment. Correspondingly, the water path can be reversed.

It should be noted that, the central tube may not be used, the filter unit may be directly assembled to the middle cavity of the electrodeionization unit, and the raw water enters the filter unit from the middle cavity, enters the electrodeionization flow channel, and is discharged from the water outlet at the electrodeionization side. The water path can also be reversed, namely, raw water enters a spiral flow channel formed by winding the bipolar membrane from a water outlet at the side of the electrodeionization, enters the filtering unit in the middle cavity from the tail end of the flow channel after desalination treatment, and is discharged from a water inlet of the filtering unit.

After the bipolar membrane constituting the membrane structure is unfolded, one side parallel to the central axis of the membrane structure is defined as a side edge of the bipolar membrane, and one side perpendicular to the central axis is defined as an end edge; the water inlet of the electrodeionization unit can be arranged on the side edge or the end edge, and the water outlet can also be arranged on the end edge or the side edge.

It should be noted that the number of the filter units is not limited to one in the embodiment, and may also be multiple, such as two, three or other numbers. The assembly position of the filtering unit can be provided with the middle cavity of the electrodeionization unit and can also be sleeved on the periphery of the electrodeionization unit, or when the filtering units are multiple, part of the filtering units are assembled in the middle cavity of the electrodeionization unit, and part of the filtering units are sleeved on the periphery of the electrodeionization unit.

Example 2.

A composite cartridge, as shown in fig. 2, has an electrodeionization unit 10 and two cartridges, one ultrafiltration cartridge UF and one PP cotton cartridge. The ultrafiltration filter core is sleeved on the periphery of the electrodeionization unit 10, and the PP cotton filter core is sequentially sleeved on the periphery of the ultrafiltration filter core.

In the composite filter element, the water inlet of the electrodeionization unit is arranged at the middle cavity, and the water outlet is arranged at the side edge of the electrodeionization unit; the water outlet is communicated with the ultrafiltration filter element, and the water outlet of the ultrafiltration filter element is communicated with the PP cotton filter element. The central lumen of the electrodeionization unit is provided with a central tube 500. Raw water enters a flow channel of the electrodeionization unit through the central tube 500, is discharged into the ultrafiltration filter element from the side edge of the electrodeionization unit, enters the PP cotton filter element for treatment after being treated by the ultrafiltration filter element, and is finally discharged from a water outlet of the PP surface filter element. The composite filter element can perform electrodeionization, ultrafiltration and PP cotton filtration on raw water, and can improve the effect of water treatment and the desalination efficiency. The composite filter element has the advantages of simple structure, good pressure bearing performance, small size and simple and convenient installation. The water purifying equipment based on the filter element has a simple structure, can realize multiple filtration by only one filter element, does not need a booster pump of a reverse osmosis desalination technology, and solves the problems of complex design, large volume and noise of the whole water purifying equipment. Correspondingly, the water path can be reversed.

It should be noted that the composite filter element may also be used to directly enter the liquid into the flow channel through the middle chamber or discharge the liquid from the middle chamber through the flow channel without providing a central tube.

It should be noted that the liquid enters the electrodeionization unit not only from the lumen site or through the central tube, but also through the end faces of the bipolar membranes.

Example 3.

A composite filter element is shown in figure 3, in which a filter unit is arranged in a stack with an electrodeionization unit 10. In this embodiment, the filter unit is an RO filter unit. The central tube 500 is all located to filter unit and electrodeionization unit cover, and the central tube sets up the through-hole, and the raw water gets into the central tube from the through-hole of central tube after filtering through filter unit to get into the electrodeionization unit by the through-hole of central tube, discharge from the delivery port of electrodeionization unit after the electrodeionization unit is handled.

The central tube in this example contains two sections of sub-tubes, one section of sub-tube is in communication with the RO filtration unit, and the other section of sub-tube is in communication with the filtration unit. It should be noted that the number of the sub-pipes included in the central pipe can be flexibly set and selected according to specific needs.

In this embodiment, the water outlet of the RO filter unit is disposed in the central tube, and the water inlet of the electrodeionization unit is disposed in the through hole of the central tube. The mode has simple structure and small volume.

The RO filtering unit is set as the single pre-stage water treatment unit for electrodeionization, so that the problem that the salt concentration of the initial water is increased because the osmotic pressure of the salt in the concentrated water slowly permeates to the water producing side due to concentration when the reverse osmosis filter element does not work can be solved. After the serial electric deionization unit is used for adsorption, the salt in the initial water can be adsorbed by the electrode, so that the initial water purity of the reverse osmosis water purifier can reach the standard.

The composite filter element of this embodiment collects multiple filtration in a drum formula filter element shell, can the direct mount on the water tap, need not booster pump and water route board, can realize getting rid of the function of each kind of impurity in aquatic such as chlorine residue, organic matter, heavy metal, bacterium, particulate matter, virus etc.. The roll-type design and the cylindrical filter element shell can bear larger pressure to prevent water leakage, and the shell can be made of common plastic parts, so that the weight is light and the cost is low. The composite filter element has small volume, no noise and simple installation.

Example 4.

The electrodeionization unit in the composite filter element is explained by combining the attached drawings. An electrodeionization unit comprising an electrode pair consisting of a pair of electrodes 100, 200, a central tube 500 and a bipolar membrane 300 wound around the central tube is shown in figure 4. The electrode 100 is arranged in the central tube 500, the bipolar membrane 300 is radially wound on the central tube 500 to form a spiral membrane structure, and the other electrode 200 is sleeved outside the membrane structure. The bipolar membrane of the membrane structure is wound to form a spiral flow channel.

In this embodiment, bipolar membrane 300 is longitudinally wound around central tube 500, as viewed in the section "B-B" of fig. 4, forming a spiral flow path. FIG. 5 is a sectional view taken along line B-B, in which the sector portions are indicated by color blocks for cation-exchange membrane 310 and anion-exchange membrane 320 in the bipolar membrane, and the water flow path is from the through-hole of center tube 500 into the flow path formed by the rotation of the bipolar membrane, and the side edges of the bipolar membrane are discharged.

The desalination process of the roll-to-roll electrodeionization unit is shown in figure 6. When desalination is carried out for a while, reverse-polarity regeneration is required to release ions in water adsorbed on the bipolar membrane, as shown in FIG. 7.

It should be noted that, between the two electrodes, the number of layers of bipolar membrane winding can be flexibly set according to the needs, and is not limited to the case of the present embodiment.

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

The spiral-wound electrodeionization unit 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 electrodeionization unit adopts a bipolar membrane structure, and has high ion exchange efficiency. The bipolar membrane is wound on the central tube to form a spiral flow channel, so that the length of the flow channel is prolonged, the retention time of water flow in the filter element is prolonged, and the desalting efficiency can be improved. The desalination efficiency of high-concentration brine can be realized under the condition of not increasing the membrane area and the volume of the filter element.

The electrodeionization unit can also be provided with a plurality of bipolar membranes, and the bipolar membranes are stacked and radially wound. The central tube can be communicated with the initial winding positions of the bipolar membranes, and the tail end positions of the bipolar membranes are water outlets. As shown in FIG. 8, there are four bipolar membranes wound. This structural arrangement, rivers can get into a plurality of spiral runners simultaneously, discharge through every spiral runner, can shorten the time of water treatment.

The electrodeionization unit can also be provided with a diversion net between the electrode and the bipolar membrane and between the bipolar membrane, wherein the diversion net comprises net materials such as polypropylene, nylon and polyester, and the thickness of the diversion net is 0.05-2 mm. And a flow channel is formed through the flow guide net, so that the accurate and effective work of the electrodeionization unit is ensured.

Example 5.

A composite filter element, otherwise characterized as in examples 1-4, except that at least one porous electrode is included in a pair of electrode sets of the electrodeionization unit.

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 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 roll type electrodeionization unit of the embodiment can be composed of a plurality of electrode groups, and when the roll type electrodeionization unit 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. 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 roll-up electrodeionization unit of this embodiment comprises an electrode pair consisting of a pair of porous electrodes 100, 200, a central tube, and a bipolar membrane 300 wound around the central tube. In the present embodiment, the porous electrode 100 is formed by laminating the current collector 130 and the porous material 110 as shown in fig. 9. The porous electrode 200 is formed by sequentially laminating a current collector and a porous material. 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.

In the roll-up electrodeionization unit of this embodiment, the porous material is in direct contact with the flow channel, and the bipolar membrane between the porous electrodes is arranged in the same manner. 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.

This formula of book electrodeionization unit adopts the structure of porous electrode and bipolar membrane, 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 whole desalting efficiency of the electrodeionization device adopting the porous electrode can be improved by more than 8% compared with that of the conventional 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.

Example 6.

A roll-to-roll electrodeionization unit having the same other features as in example 7 except that in this example: as shown in fig. 10, 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 also formed by stacking a current collector, a porous material, and a cation exchange membrane 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.

Experiments show that the whole desalting efficiency of the electrodeionization device adopting the porous electrode can be improved by more than 10% compared with that of the electrodeionization device adopting the common electrode, 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.

The filter core of this embodiment can prolong the length of runner, increases the flow of liquid in the runner desalination, promotes desalination efficiency by a wide margin. The desalination efficiency of high-concentration brine can be realized under the condition of not increasing the membrane area and the volume of the filter element.

Example 7.

A water treatment apparatus having a composite cartridge as described in any one of embodiments 1 to 9, which water treatment apparatus is useful 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 composite filter element 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).

This water treatment facilities, its composite filter core collection multiple filtration can get rid of various impurity in aquatic like the function of chlorine residue, organic matter, heavy metal, bacterium, particulate matter, virus etc. in a cylinder formula filter core shell. The roll-type design and the cylindrical filter element shell can bear larger pressure to prevent water leakage, and the shell can be made of common plastic parts, so that the weight is light and the cost is low. The whole water treatment equipment has small volume, no noise and simple installation.

The water treatment equipment of the embodiment has the advantages that the length of the flow channel is prolonged by the filter element, so that the flow of liquid desalting in the flow channel is increased, the desalting efficiency is greatly improved, and the desalting efficiency of high-concentration brine can be realized under the condition that the membrane area and the volume of the filter element are not increased.

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.