CDI nanofiltration assembly and device using capacitive deionization to enhance separation membrane desalination

Abstract

The invention relates to the technical field of water treatment, and specifically discloses a CDI nanofiltration component and device for desalination by using a capacitive deionization enhanced separation membrane, comprising a membrane shell and a membrane core, wherein the membrane core is located inside the membrane shell; the membrane core comprises a filter membrane in a winding structure and a central tube arranged inside the filter membrane; the filter membrane comprises an insulating layer A, a current collector A, an anode plate layer, a guide plate A, a nanofiltration membrane layer A, a water production spacer, a nanofiltration membrane layer B, a guide plate B, a cathode plate layer, a current collector B and an insulating layer B which are stacked in sequence; a plurality of adsorption holes are provided on the anode plate layer and the cathode plate layer, the guide plate A is connected to the current collector A through the adsorption holes, and the guide plate B is connected to the current collector B through the adsorption holes; a spiral dirt cleaning part is rotatably provided on one side of the guide plate A and one side of the guide plate B. The invention has the characteristics of small concentration polarization, weak inorganic salt scaling and small desalination load.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and in particular to a CDI nanofiltration component and device utilizing capacitive deionization to enhance separation membrane desalination. Background Art

[0002] Nanofiltration and reverse osmosis are desalination technologies that use pressure as a driving force. They are used in pure water purification, reclaimed water reuse, and material desalination separation due to their high desalination efficiency, maturity, and reliability. However, they have problems such as severe concentration polarization, low water production efficiency, membrane scaling and blockage, and high energy consumption during their application. In particular, the water recovery rate is low in small water purification devices, resulting in a large amount of water resource waste.

[0003] The capacitive deionization technology (CDI) based on the double-layer adsorption theory does not require the addition of additional chemical reagents, and the applied voltage is relatively low. It has the advantages of simple operation, energy saving and environmental friendliness. It has broad application prospects in many fields such as seawater desalination, hard water softening, ion recovery and heavy metal salt treatment. However, due to the limitation of electrode materials, wastewater with excessive concentration will clog the nanofiltration membrane and pipeline, resulting in a low desalination efficiency and greatly reduced desalination efficiency.

[0004] The patent document with publication number "CN106006860A" discloses a solar-powered high-salt organic wastewater treatment device, which is characterized by comprising: at least one electrochemical oxidation electrolytic cell 105; a capacitive deionization desalination device 110; a solar power supply device 103, wherein each of the electrolytic cells 105 includes an electrochemical anode 202, an electrochemical cathode 206 and a cell body, and the capacitive deionization desalination device 110 includes at least one group of capacitive deionization units 301, and the solar power supply device 103 is used to provide power to the electrolytic cell 105 and the capacitive deionization desalination device 110 as a DC power supply for the electrolytic cell and the capacitive deionization desalination device. A high-salt organic wastewater treatment method based on the above device is also provided, but due to the limitation of the electrode material, the desalination efficiency is still not high enough.

[0005] The patent document with the publication number of "CN206368082U" discloses a high-efficiency water treatment system for domestic sewage, including a raw water tank, a softening tank, a primary sedimentation tank, a coagulation sedimentation tank, a quartz sand filter, an activated carbon filter, an ion exchanger, a precision filter and a reverse osmosis membrane assembly connected in sequence by pipes, pumps and valves, wherein the reverse osmosis membrane assembly adopts a wide-channel nanofiltration membrane assembly, the flow channel width of the membrane element is much larger than the width of 34 mil of a conventional anti-pollution membrane, and has a modified concentrated water guide baffle, which is easy to remove pollutants, avoids the problem of easy attachment of pollutants at the cross intersection of conventional concentrated water baffles, reduces the fouling rate, reduces the frequency of chemical cleaning, and extends the life of the membrane element. It has the characteristics of high desalination rate, low energy consumption, strong selectivity, high interception rate, strong pollution resistance, good recovery, etc. At the same time, due to the structural characteristics of the wide-channel nanofiltration membrane assembly itself, it can reduce more than 50% of the operating costs during use and reduce the equipment operating capital; however, it has severe concentration polarization during the desalination process, resulting in low water production efficiency.

[0006] Therefore, there is an urgent need to improve the capacitive deionization and desalination device to solve the above-mentioned problems. Summary of the invention

[0007] In order to solve the above technical problems existing in the existing water treatment process, the present invention provides a CDI nanofiltration component and device using capacitive deionization to enhance separation membrane desalination, which has the characteristics of small concentration polarization effect, weak inorganic salt scaling and small desalination load.

[0008] The first technical solution of the present invention is a CDI nanofiltration component for enhancing separation membrane desalination by using capacitive deionization, comprising a membrane shell and a membrane core, wherein the membrane core is located inside the membrane shell; the membrane core comprises a filter membrane in a winding structure and a central tube arranged inside the filter membrane; the filter membrane comprises an insulating layer A, a current collector A, an anode plate layer, a guide plate A, a nanofiltration membrane layer A, a water production spacer, a nanofiltration membrane layer B, a guide plate B, a cathode plate layer, a current collector B and an insulating layer B which are stacked in sequence; a plurality of adsorption holes are provided on the anode plate layer and the cathode plate layer, the guide plate A is connected to the current collector A through the adsorption holes, and the guide plate B is connected to the current collector B through the adsorption holes; a spiral dirt cleaning piece is rotatably provided on one side of the guide plate A and one side of the guide plate B. The present invention adopts the bottom end of the central tube as the water inlet. Under the action of pressure, raw water passes through the filter membrane. Since the anode plate layer, the cathode plate layer, the nanofiltration membrane layer A and the nanofiltration membrane layer B are respectively arranged inside the filter membrane, the capacitive deionization technology is coupled with the nanofiltration reverse osmosis technology. Under the action of the electric field, the charged ions in the water migrate to the anode plate layer and the cathode plate layer respectively, so that the ion concentration on the concentrated water side of the filter membrane surface is greatly reduced, thereby greatly reducing the concentration polarization effect, improving the salt interception effect and water production flux of the nanofiltration membrane layer A and the nanofiltration membrane layer B; at the same time, the anions and cations in the water body are respectively adsorbed on the anode plate layer and the cathode plate layer to achieve separation, which can effectively avoid the scaling of inorganic salts generated by nanofiltration and reverse osmosis concentration and enrichment; the present invention The invention greatly improves the desalination efficiency, reduces the concentration polarization effect on the membrane surface during the concentration process, reduces the structural pollution tendency of the membrane surface, and also improves the water production efficiency and reduces energy consumption; because the anode plate layer will adsorb a large number of anions such as chloride ions and sulfate ions when powered, and the cathode plate layer will adsorb a large number of cations such as sodium ions and calcium ions. By setting adsorption holes, many impurity ions can be gathered in the corresponding adsorption holes, so that more impurities can be adsorbed on both the anode plate layer and the cathode plate layer, thereby improving the filtering effect of capacitive deionization, and by setting a spiral cleaning part, the impurities on the anode plate layer and the cathode plate layer can be removed in time, so that the entire CDI nanofiltration component is always in a good filtering state. The spiral cleaning part rotates horizontally around the central tube, so that the impurities on the anode plate layer and the cathode plate layer can be stably cleaned.

[0009] Preferably, a spiral buffer groove with a spiral structure is provided on the outer side of the central tube, and a plurality of water distribution ports are provided between the spiral buffer grooves. The spiral buffer groove can increase the outer surface area of ​​the central tube, so that the salt water from the water distribution port can seep out from the CDI nanofiltration component over a larger area, thereby maintaining a good desalination effect.

[0010] Preferably, a foam ring is fixedly provided at the upper end of the spiral cleaning piece, and a magnetic alloy ring is fixedly provided at the bottom of the spiral cleaning piece, wherein the magnetic alloy ring is used to increase the gravity of the spiral cleaning piece, and the foam ring is used to increase the buoyancy of the spiral cleaning piece.

[0011] Preferably, the spiral cleaning member is a wooden annular structure. The wooden material can prevent the electric charges on the anode plate layer and the cathode plate layer from being affected during the cleaning process.

[0012] Preferably, a cleaning brush is fixedly arranged between the spiral cleaning parts, and a plurality of spiral blades are arranged on the cleaning brush, and a bristle brush is arranged between adjacent spiral blades, and the bristle brush contacts the corresponding anode plate layer and cathode plate layer. The spiral blade is used to rotate the spiral cleaning part; the spiral cleaning part is suspended in the guide plate A and the guide plate B. According to: F float = ρ liquid gV row, the spiral cleaning part is suspended inside the guide plate A and the guide plate B, and while the spiral cleaning part rotates, the cleaning brush on the spiral cleaning part rotates on the outer side of the anode plate layer and the cathode plate layer, and the impurities inside the adsorption hole are cleaned by the bristle brush on the cleaning brush, so as to speed up the efficiency of impurity removal; at the same time, after the water flow passes through the nanofiltration membrane layer A and the nanofiltration membrane layer B, it will promote the rotation of the spiral cleaning part, and the spiral cleaning part can drive the bristle brush to clean the anode plate layer and the cathode plate layer when rotating, without the need to use additional resources, and while the filtration efficiency is improved, the liquid can be stirred again.

[0013] Preferably, the calculation formula of the material capacitance C in the CDI nanofiltration component is,

[0014] C = εA / (4πkd);

[0015] Among them, ε is the dielectric constant of the material, A is the area of ​​the anode plate layer or the cathode plate layer, k is the electrostatic force constant, and d is the distance between the anode plate layer and the cathode plate layer.

[0016] Preferably, the electrode material specific capacitance C in the CDI nanofiltration assembly m The calculation formula is,

[0017]

[0018] in, Q is the total charge flowing; m is the mass of the electrode; V is the potential scanning width; I is the average current; v is the potential scanning speed; i is the charge and discharge current; E1 and E2 are the scan start potential and end potential. Since the adsorption and desorption of ions in the present invention is carried out in the double-layer cyclic charge and discharge process, the material is easy to recycle, and the specific capacitance is theoretically a constant value, so the high desalination efficiency can still be maintained after multiple cycles; in the desalination process of the present invention, in order to suppress the hydrogen and oxygen evolution reactions on the anode plate layer and the cathode plate layer, the applied voltage cannot exceed 2V, and preferably 1.2V or 1.6V is selected.

[0019] Preferably, the electrode material specific capacitance C in the CDI nanofiltration assembly mThe methods include three-electrode system and cyclic voltammetry, EIS electrochemical impedance spectroscopy or constant current charge-discharge method.

[0020] Preferably, the anode plate layer and the cathode plate layer adopt a ring plate capacitance model. More preferably, the anode plate layer and the cathode plate layer adopt a GCS double layer model. When the material specific capacitance (C / m) is increased, the ability of the electrode to adsorb ions can be increased under the same conditions, and the desalination effect can be improved. In the desalination process of the CDI nanofiltration component, a double layer capacitor can be formed. Due to the applied voltage, the electrode solution interface undergoes a redox reaction, or the functional groups on the electrode surface undergo a transformation, which manifests as a Faraday capacitor, which increases the amount of charge on the surface of the anode plate layer and the cathode plate layer, and also reduces the mass transfer resistance, so that the ion adsorption of the electrode is higher. The GCS double layer model is a Gouy-Chapman-Stern model.

[0021] Preferably, the calculation formula for the desalination amount q of the CDI nanofiltration component is:

[0022] q=(ρ0-ρ)V / m;

[0023] Where ρ0 and ρ are the mass concentrations of salt in the salt solution before and after treatment by the CDI nanofiltration component, respectively, V is the volume of the salt solution, and m is the mass of the electrode.

[0024] Preferably, the anode plate layer and cathode plate layer are made of carbon aerogel material. Carbon aerogel material is a material with macropore distribution, which is conducive to treating a large amount of water and improving the salt removal rate, and can further realize continuous desalination operation, and can recover and reuse electrical energy in the CDI nanofiltration component.

[0025] Preferably, the interior of the central tube is filled with a pH regulator; the pH regulator is one or more of lime, sodium carbonate, and caustic soda. pH affects the redox potential in the salt solution, such as hydrogen evolution and oxygen evolution reactions. Different pH values ​​will affect the desalination performance of the materials in the CDI nanofiltration component. By adding a pH regulator, the conductivity of the solution is enhanced, which can improve the desalination effect.

[0026] The second technical solution of the present invention: utilizing capacitive deionization to strengthen the separation membrane desalination device, including a device body, wherein the upper end of the device body is provided with a clean water outlet end cap, the bottom of the device body is provided with a water inlet end cap, and the interior of the device body is provided with a plurality of CDI nanofiltration components; the water inlet end cap is provided with a plurality of water inlet inner tubes, and the water inlet inner tubes are connected to the central tubes of the corresponding CDI nanofiltration components; the water inlet end cap is provided with a water inlet pipe, and the water inlet pipe is connected to the plurality of water inlet inner tubes. The central tubes inside the plurality of CDI nanofiltration components are connected to the water inlet pipe together, so that water can be added to the plurality of central tubes at the same time through the water inlet pipe, and the structure is simple. On the one hand, the water can be diverted, the water flow rate can be increased, and the pressure inside the central tube can be increased; on the other hand, the structure is simple, easy to use, and the desalination efficiency is improved.

[0027] Preferably, the water inlet end cover is provided with a plurality of concentrated water through holes on the circumference of the water inlet inner tube, the water inlet end cover is provided with a buffer bin inside, the buffer bin is connected with the concentrated water through hole, the outer wall of the water inlet end cover is provided with a concentrated water discharge pipe, the concentrated water discharge pipe is connected with the buffer bin; the concentrated water discharge pipe is connected with the water inlet pipe. The concentrated water through hole corresponds to the filter membrane, the concentrated water flows downward from the gap between the membrane shell and the filter membrane, and flows into the concentrated water discharge pipe through the concentrated water through hole on the water inlet end cover, so that the purpose of discharging concentrated water can be achieved.

[0028] Preferably, the water inlet inner tube is not connected to the concentrated water through hole, so that the discharge of concentrated water can be achieved without affecting the discharge of concentrated water during the water inlet process, the structure is simple, the use is convenient, and the desalination efficiency is greatly improved.

[0029] Preferably, the water inlet inner pipe is connected to the water inlet pipe through a four-way valve, the four-way valve is arranged below the buffer bin, a stirring wheel is arranged inside the buffer bin for rotation, the impeller of the stirring wheel extends to the bottom of the concentrated water through hole, and a magnetic block is fixed on the upper side of the stirring wheel. After the sewage flows into the buffer bin through the concentrated water through hole, the impeller on the stirring wheel rotates under the flow of sewage, which can further stir the impurities inside the buffer bin to prevent the buffer bin from being blocked and improve the desalination efficiency; when the sewage enters the buffer bin through the concentrated water through hole, it will drive the rotation of the stirring wheel, and the stirring wheel will drive the rotation of the magnetic block on the stirring wheel at the same time, and the magnetic block corresponds to the magnetic alloy ring at the bottom of the spiral cleaning part, and the spiral cleaning part and the magnetic alloy ring move relative to each other under the action of the magnetic field, that is, the rotation of the stirring wheel can further drive the rotation of the spiral cleaning part, so as to achieve the purpose of removing dirt and greatly improve the filtration efficiency.

[0030] Preferably, a generator is arranged below the stirring wheel, the stirring wheel is arranged at the output end of the generator, a heating assembly is arranged above the stirring wheel, the generator is electrically connected to the heating assembly; the heating assembly includes a plurality of heating strips, the heating strips are arranged above the stirring wheel. The upper part of the stirring wheel is not in contact with the heating assembly, and the stirring wheel is driven to rotate during the flow of sewage through the concentrated water through hole. During the rotation of the stirring wheel, the generator generates electrical energy, the generator is electrically connected to the heating assembly, and the heating strips can heat the sewage. During the heating process, the solubility of the salt can be improved, and the salt crystals can be prevented from being immersed in the interior of the buffer bin, thereby improving the filtration efficiency.

[0031] Preferably, the outer side of the concentrated water discharge pipe is movably sleeved with a dust cleaning sleeve, and the interior of the concentrated water discharge pipe is provided with a sewage stirring piece corresponding to the dust cleaning sleeve. The dust cleaning sleeve is used to rotate and push the sewage stirring piece.

[0032] The periphery of the sewage stirring piece is provided with a plurality of stirring support arms which are symmetrical in center. The outer side of the stirring support arm is fixedly provided with a magnetic ring. The inner ring of the cleaning sleeve is fixedly provided with a rubidium magnetic ring. The magnetic properties of the contact surface of the rubidium magnetic ring and the magnetic ring are opposite. The outer side of the cleaning sleeve is fixedly provided with an anti-skid ring. The cleaning sleeve corresponds to the sewage stirring piece. The sewage stirring piece can be dragged inside the water inlet pipe by sliding the cleaning sleeve. The sewage stirring piece can be rotated inside the water inlet pipe by rotating the cleaning sleeve. Therefore, the salt inside the water inlet pipe can be cleaned by dragging the sewage stirring piece by the cleaning sleeve to prevent crystallization from clogging the inside of the water inlet pipe and improve the desalination efficiency.

[0033] Preferably, a water-passing grid is connected between the device body and the clean water outlet end cover, the upper end of the membrane shell is connected to a water-passing baffle, and the water-passing grid is arranged above the water-passing baffle. The clean water produced on the filtration membrane first passes through the water-passing baffle on the water-producing baffle, then passes through the water-passing grid into the interior of the clean water outlet end cover, and is discharged through the water inlet pipe.

[0034] Preferably, a limiting baffle is provided inside the water-passing grille, and an upper side surface of the limiting baffle is lower than an upper side surface of the water-passing grille.

[0035] The limit partition is provided with a plurality of water purification holes.

[0036] Preferably, the upper end of the purified water outlet end cover is connected with a drain pipe, and the drain pipe is communicated with the interior of the device body.

[0037] A power transmission line pipe is arranged on one side of the drainage pipe, and a rubber ring is fixedly arranged inside the power transmission line pipe; the rubber ring seals the wire to prevent overflow when the pressure is too high, thereby improving the service life and safety of the device body.

[0038] The water inlet end cover is provided with a rubber sealing ring which is used to seal the device body and the device body and the water inlet end cover.

[0039] Preferably, the anode plate layer and the cathode plate layer are both electrically connected to an external power source via wires.

[0040] Preferably, the plurality of spiral blades are evenly distributed on the dirt cleaning brush.

[0041] Preferably, the plurality of spiral blades are arranged on the inner side surface of the spiral cleaning member in contact with the nanofiltration membrane layer A or the nanofiltration membrane layer B.

[0042] The present invention has the following beneficial effects:

[0043] (1) The bottom end of the central tube is used as the water inlet. Under the action of pressure, the raw water passes through the filter membrane. Since the anode plate layer, the cathode plate layer, the nanofiltration membrane layer A and the nanofiltration membrane layer B are respectively arranged inside the filter membrane, the capacitive deionization technology is coupled with the nanofiltration reverse osmosis technology. Under the action of the electric field, the charged ions in the water migrate to the anode plate layer and the cathode plate layer respectively, so that the ion concentration on the concentrated water side of the filter membrane surface is greatly reduced, thereby greatly reducing the concentration polarization effect, and improving the salt interception effect and water production flux of the nanofiltration membrane layer A and the nanofiltration membrane layer B; at the same time, the anions and cations in the water body are respectively adsorbed on the anode plate layer and the cathode plate layer to achieve separation, which can effectively avoid the formation of inorganic salt scaling due to nanofiltration and reverse osmosis concentration and enrichment;

[0044] (2) Inorganic salt scale is enriched and generated, which can be largely dissolved under the action of the spiral cleaning component, stirring wheel and heating component, greatly improving the desalination efficiency, reducing the concentration polarization effect on the membrane surface during the concentration process, reducing the structural pollution tendency of the membrane surface, and also improving the water production efficiency and reducing energy consumption;

[0045] (3) Since the anode plate layer will adsorb a large amount of anions such as chloride ions and sulfate ions when energized, and the cathode plate layer will adsorb a large amount of cations such as sodium ions and calcium ions, by setting adsorption holes, many impurity ions can be gathered in the corresponding adsorption holes, so that more impurities can be adsorbed on both the anode plate layer and the cathode plate layer, thereby improving the filtering effect of capacitive deionization. By setting a spiral cleaning part, impurities on the anode plate layer and the cathode plate layer can be removed in time, so that the entire CDI nanofiltration component is always in a good filtering state. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 It is a structural diagram of the CDI nanofiltration component in the present invention;

[0047] Figure 2 for Figure 1A in the enlarged view;

[0048] Figure 3 It is a structural explosion diagram of the device in the present invention;

[0049] Figure 4 for Figure 3 The enlarged view of point B in the figure;

[0050] Figure 5 It is a structural schematic diagram of the device in the present invention;

[0051] Figure 6 It is a structural schematic diagram of the water inlet end cover in the present invention;

[0052] Figure 7 It is a structural expansion diagram of the filter membrane in the present invention;

[0053] Figure 8 This is a structural diagram of the water inlet pipe in the present invention;

[0054] Fig. 9 It is a cross-sectional view of the water inlet end cover in the present invention;

[0055] Fig.10 This is a structural diagram of the sewage stirring member in the present invention;

[0056] Fig.11 This is a structural diagram of the spiral dirt cleaning component in the present invention.

[0057] The markings in the attached drawings are: 1-device body; 2-CDI nanofiltration assembly; 3-water grid; 4-clean water outlet end cover; 401-drain pipe; 402-transmission line pipe; 5-water inlet end cover; 501-water inlet pipe; 502-concentrated water discharge pipe; 503-inner water inlet pipe; 504-concentrated water through hole; 505-buffer bin; 506-four-way valve; 6-membrane shell; 7-membrane core; 8-center tube; 801-water distribution port; 802-spiral buffer groove; 9-rubber sealing ring; 10-filter membrane; 101-insulating layer A; 102-current collector A; 103-anode plate layer; 104-guide plate A; 105- Guide plate B; 106-cathode plate layer; 107-current collector B; 108-insulating layer B; 11-nanofiltration membrane layer A; 12-water production screen; 13-nanofiltration membrane layer B; 14-water passing baffle; 15-limiting baffle; 16-water purification hole; 17-stirring wheel; 18-sewage stirring piece; 19-stirring support arm; 20-magnetic ring; 21-ash cleaning sleeve; 22-needle magnetic ring; 23-anti-slip ring, 24-generator, 25-heating component, 26-heating strip, 27-spiral cleaning piece, 28-foam ring, 29-magnetic alloy ring, 30-cleaning brush, 31-bristle brush, 32-spiral blade. DETAILED DESCRIPTION

[0058] The present invention is further described below in conjunction with the embodiments and drawings, but they are not intended to limit the present invention.

[0059] like Figure 1 , Figure 3 and Figure 5 The CDI nanofiltration assembly using capacitive deionization to enhance separation membrane desalination as shown comprises a membrane shell 6 and a membrane core 7, wherein the membrane core 7 is located inside the membrane shell 6; the membrane core 7 comprises a filter membrane 10 in a winding structure and a filter disposed inside the filter membrane 10 as shown in FIG. Figure 2 The central tube 8 shown; the filter membrane 10 includes Figure 7 The insulating layer A101, the current collector A102, the anode plate layer 103, the guide plate A104, the nanofiltration membrane layer A11, the water production screen 12, the nanofiltration membrane layer B13, the guide plate B105, the cathode plate layer 106, the current collector B107 and the insulating layer B108 are stacked in sequence; the anode plate layer 103 and the cathode plate layer 106 are provided with a plurality of adsorption holes, the guide plate A104 is connected to the current collector A102 through the adsorption holes, and the guide plate B105 is connected to the current collector B107 through the adsorption holes; one side of the guide plate A104 and one side of the guide plate B105 are both rotatably provided with a spiral cleaning member 27. The interior of the central tube 8 is filled with a PH regulator; the PH regulator is one or more of lime, sodium carbonate and caustic soda.

[0060] The outer side of the central tube 8 is provided with a spiral buffer groove 802 of a spiral structure, and a plurality of water distribution ports 801 are provided between the spiral buffer grooves 802. A foam ring 28 is fixedly provided at the upper end of the spiral cleaning member 27, and a magnetic alloy ring 29 is fixedly provided at the bottom of the spiral cleaning member 27. A cleaning brush 30 is fixedly provided between the spiral cleaning members 27, and a plurality of spiral blades 32 are provided on the cleaning brush 30. A plurality of spiral blades 32 are provided between adjacent spiral blades 32. Fig.11 The bristle brush 31 is shown, and the bristle brush 31 is in contact with the corresponding anode plate layer 103 and cathode plate layer 106.

[0061] The calculation formula for the material capacitance C in the CDI nanofiltration component is,

[0062] C = εA / (4πkd);

[0063] Among them, ε is the dielectric constant of the material, A is the area of ​​the anode plate layer or the cathode plate layer, k is the electrostatic force constant, and d is the distance between the anode plate layer and the cathode plate layer.

[0064] The specific capacitance C of the electrode material in the CDI nanofiltration component m The calculation formula is,

[0065]

[0066] Among them, Q is the total charge flowing; m is the mass of the electrode; V is the scanning potential width; I is the average current; v is the potential scanning speed; i is the charge and discharge current; E1 and E2 are the starting potential and end potential of the scan.

[0067] The calculation formula for the desalination amount q of the CDI nanofiltration component is:

[0068] q=(ρ0-ρ)V / m;

[0069] Where ρ0 and ρ are the mass concentrations of salt in the salt solution before and after treatment by the CDI nanofiltration component, respectively, V is the volume of the salt solution, and m is the mass of the electrode.

[0070] The desalination device using capacitive deionization enhanced separation membrane comprises a device body 1, wherein the upper end of the device body 1 is provided with a clean water outlet end cap 4, the bottom of the device body 1 is provided with a water inlet end cap 5, and the inside of the device body 1 is provided with a plurality of CDI nanofiltration components 2; the water inlet end cap 5 is provided with a plurality of water inlet inner tubes 503, and the water inlet inner tubes 503 are connected to the central tube 8 of the corresponding CDI nanofiltration component 2; the water inlet end cap 5 is provided with the following Figure 8 The water inlet pipe 501 shown in FIG. Figure 6 The water inlet inner tube 503 is connected. A plurality of concentrated water through holes 504 are correspondingly opened on the water inlet end cover 5 on the circumference of the water inlet inner tube 503. A buffer bin 505 is provided inside the water inlet end cover 5. The buffer bin 505 is connected to the concentrated water through holes. A concentrated water discharge pipe 502 is provided on the outer wall of the water inlet end cover 5. The concentrated water discharge pipe 502 is connected to the buffer bin 505. The concentrated water discharge pipe 502 is connected to the water inlet pipe 501. The water inlet inner tube 503 is not connected to the concentrated water through holes 504. The water inlet inner tube 503 is connected to the water inlet pipe 501 through a four-way valve 506. The four-way valve 506 is arranged below the buffer bin 505. The internal rotation of the buffer bin 505 is arranged as shown in FIG. Fig. 9 The stirring wheel 17 shown in the figure has an impeller extending to the bottom of the concentrated water through hole 504, and a magnetic block 33 is fixedly arranged on the upper side of the stirring wheel 17. A generator 24 is arranged below the stirring wheel 17, and the stirring wheel 17 is arranged at the output end of the generator 24. A heating component 25 is arranged above the stirring wheel 17, and the generator 24 is electrically connected to the heating component 25; the heating component 25 includes a plurality of heating strips 26, and the heating strips 26 are arranged above the stirring wheel 17.

[0071] The outer side of the concentrated water discharge pipe 502 is movably sleeved with a dust cleaning sleeve 21, and the interior of the concentrated water discharge pipe 502 is provided with a corresponding dust cleaning sleeve 21. Fig.10The sewage stirring member 18 is shown; a plurality of stirring support arms 19 are arranged around the sewage stirring member 18 in a centrally symmetrical manner, a magnetic ring 20 is fixedly arranged on the outer side surface of the stirring support arm 19, a rubidium magnetic ring 22 is fixedly arranged on the inner ring of the cleaning sleeve 21, the magnetic properties of the rubidium magnetic ring 22 and the contact surface of the magnetic ring 20 are opposite, and an anti-slip ring 23 is fixedly arranged on the outer side surface of the cleaning sleeve 21. A water flow grid 3 is connected between the device body 1 and the clean water outlet end cover 4, a water flow baffle 14 is connected to the upper end of the membrane shell 6, and the water flow grid 3 is arranged above the water flow baffle 14. A limiting baffle 15 is arranged inside the water flow grid 3, and the upper side surface of the limiting baffle 15 is lower than the upper side surface of the water flow grid 3; the limiting baffle 15 is provided with a plurality of Figure 4 The water purification hole 16 is shown. The upper end of the water purification outlet cover 4 is connected with a drain pipe 401, and the drain pipe 401 is connected with the inside of the device body 1; a power transmission line pipe 402 is arranged on one side of the drain pipe 401, and a rubber ring is fixedly arranged inside the power transmission line pipe 402; a rubber sealing ring 9 is arranged on the water inlet cover 5.

[0072] like Figure 1 and Figure 2 The CDI nanofiltration assembly using capacitive deionization to enhance separation membrane desalination as shown includes a membrane shell 6 and a membrane core 7, wherein the membrane core 7 is located inside the membrane shell 6; the membrane core 7 includes a winding structure such as Figure 7 The filter membrane 10 shown and the central tube 8 disposed inside the filter membrane 10; the filter membrane 10 includes an insulating layer A101, a current collector A102, an anode plate layer 103, a guide plate A104, a nanofiltration membrane layer A11, a water production screen 12, a nanofiltration membrane layer B13, a guide plate B105, a cathode plate layer 106, a current collector B107 and an insulating layer B108, which are stacked in sequence. A plurality of water distribution ports 801 are provided on the central tube 8, and both the anode plate layer and the cathode plate layer are electrically connected to an external power source through wires.

[0073] like Figure 3 , Figure 5 as well as Fig.11 The desalination device using capacitive deionization to enhance separation membrane shown in the figure comprises a device body 1, the upper end of the device body 1 is provided with a clean water outlet end cover 4, and the bottom of the device body 1 is provided with a Figure 6In the water inlet end cover 5 shown, a plurality of CDI nanofiltration assemblies 2 are arranged inside the device body 1; a plurality of water inlet inner tubes 503 are arranged on the water inlet end cover 5, and the water inlet inner tubes 503 are connected to the central tube 8 of the corresponding CDI nanofiltration assembly 2. A water inlet pipe 501 is arranged on the water inlet end cover 5, and the water inlet pipe 501 is connected to the plurality of water inlet inner tubes 503. A plurality of concentrated water through holes 504 are correspondingly opened on the circumference of the water inlet inner tubes 503 on the water inlet end cover 5, a space is arranged inside the water inlet end cover 5, and the space is connected to the concentrated water through holes, and a concentrated water discharge pipe 502 is arranged on the outer wall of the water inlet end cover 5, and the concentrated water discharge pipe 502 is connected to the space. The concentrated water discharge pipe 502 is connected to the water inlet pipe 501; the water inlet inner tube 503 is not connected to the concentrated water through hole 504. A rubber sealing ring 9 is arranged on the water inlet end cover 5.

[0074] The device body 1 is connected to the purified water outlet end cover 4 as shown in the figure. Figure 4 The water-passing grid 3 shown in the figure has a water-passing baffle 14 connected to the upper end of the membrane shell 6. The water-passing grid 3 is arranged above the water-passing baffle 14. A limiting baffle 15 is arranged inside the water-passing grid 3. The upper side of the limiting baffle 15 is lower than the upper side of the water-passing grid 3. A plurality of water-cleaning holes 16 are opened on the limiting baffle 15. A drain pipe 401 is connected to the upper end of the clean water outlet end cover 4. The drain pipe 401 is connected to the inside of the device body 1. A power transmission line pipe 402 is arranged on one side of the drain pipe 401. A rubber ring is fixed inside the power transmission line pipe 402.

[0075] The outer side of the central tube 8 is provided with a spiral buffer groove 802 of a spiral structure, and the spiral buffer groove 802 plays a certain buffering role. A plurality of water distribution ports 801 are provided between the spiral buffer grooves 802;

[0076] The calculation formula for the material capacitance C in the CDI nanofiltration component is,

[0077] C = εA / (4πkd);

[0078] Among them, ε is the dielectric constant of the material, A is the area of ​​the anode plate layer or the cathode plate layer, k is the electrostatic force constant, and d is the distance between the anode plate layer and the cathode plate layer.

[0079] Calculation of specific capacitance C of electrode materials using three-electrode system and cyclic voltammetry m :

[0080]

[0081] Where Q is the total charge flowing, m is the mass of the electrode, V is the potential scan width, I is the average current, v is the potential scan rate (V / t), i is the charge and discharge current, E1 and E2 are the scan start potential and end potential, and

[0082]

[0083] The material specific capacitance can also be calculated using the EIS AC impedance method and the constant current charge and discharge method.

[0084] The calculation formula for the desalination amount q of the CDI nanofiltration component is:

[0085] q=(ρ0-ρ)V / m;

[0086] Where ρ0 and ρ are the mass concentrations of salt in the salt solution before and after treatment by the CDI nanofiltration component, respectively, V is the volume of the salt solution, and m is the mass of the electrode.

[0087] The interior of the central tube is filled with a pH regulator, which is one or more of lime, sodium carbonate, and caustic soda.

[0088] A plurality of adsorption holes are provided on the anode plate layer 103 and the cathode plate layer 106. The guide plate A104 is connected to the current collector A102 through the adsorption holes, and the guide plate B105 is connected to the current collector B107 through the adsorption holes. A spiral cleaning member 27 is rotatably provided on one side of the guide plate A104 and one side of the guide plate B105. The spiral cleaning member 27 is used to remove impurities on the anode plate layer 103 and the cathode plate layer 106. Since the anode plate layer will adsorb a large amount of anions such as chloride ions and sulfate ions when powered, and the cathode plate layer will adsorb a large amount of cations such as sodium ions and calcium ions, by providing adsorption holes, many impurity ions can be gathered in the corresponding adsorption holes, so that more impurities can be adsorbed on the anode plate layer and the cathode plate layer, thereby improving the filtering effect of capacitive deionization. By providing the spiral cleaning member, the impurities on the anode plate layer and the cathode plate layer can be removed in time, so that the entire CDI nanofiltration component is always in a good filtering state.

[0089] The spiral cleaning member 27 is a wooden annular structure, a foam ring 28 is fixedly provided at the upper end of the spiral cleaning member 27, a magnetic alloy ring 29 is fixedly provided at the bottom of the spiral cleaning member 27, the spiral cleaning member 27 rotates horizontally around the central tube 8, a cleaning brush 30 is fixedly provided between the spiral cleaning members 27, a number of evenly distributed spiral blades 32 are provided on the cleaning brush 30, a pig bristle brush 31 is provided between every two spiral blades 32, a number of spiral blades 32 are fixedly provided on the inner side of the spiral cleaning member 27 in contact with the nanofiltration membrane layer A11 and the nanofiltration membrane layer B13, the spiral blades 32 are used to rotate the spiral cleaning member 27, and the spiral cleaning member 27 is suspended on one side of the guide plate A104 and the guide plate B105;

[0090] The magnetic alloy ring 29 on the spiral cleaning member 27 is used to increase the gravity of the spiral cleaning member 27, and the foam ring 28 is used to increase the buoyancy of the spiral cleaning member 27, according to:

[0091] F float = ρ liquid gV row, so that the spiral cleaning member 27 is suspended on one side of the guide plate A104 and the guide plate B105, and while the spiral cleaning member 27 rotates, the cleaning brush 30 on the spiral cleaning member 27 rotates on the outer side of the anode plate layer 103 and the cathode plate layer 106, and the bristle brush 31 on the cleaning brush 30 cleans the impurities inside the adsorption hole, thereby accelerating the efficiency of impurity removal;

[0092] In addition, after the water flows through the nanofiltration membrane layer A11, it will drive the spiral cleaning part 27 to rotate. While rotating, the spiral cleaning part 27 can drive the bristle brush 31 to clean the anode plate layer 103 and the cathode plate layer 106 without using additional resources. While the filtration efficiency is improved, the liquid can be stirred again.

[0093] The invention discloses a desalination device using a capacitive deionization enhanced separation membrane, comprising a device body 1, wherein the upper end of the device body 1 is connected with a clean water outlet end cap 4, the bottom of the device body 1 is connected with a water inlet end cap 5 by bolts, a plurality of CDI nanofiltration components 2 are arranged inside the device body 1, and a plurality of CDI nanofiltration components 2 are arranged inside the device body 1, wherein the CDI nanofiltration components 2 include a membrane shell 6 and a membrane core 7, wherein the membrane shell 6 is arranged on the outer side of the membrane core 7, and the membrane core 7 includes a filter membrane 10 and a central tube 8 fixedly arranged inside the filter membrane 10, wherein the central tube 8 is arranged on the inner side of ... The bottom end of the core tube 8 is a water inlet, and a purified water outlet end cap 4 is provided at the top end of the membrane shell 6. Raw water enters the device body 1 from the water inlet end cap 5. Under the action of pressure, the raw water passes through the membrane core 7 inside the CDI nanofiltration component 2 and flows out from the purified water outlet end cap 4. A filter membrane 10 is provided inside the membrane core 7. At the same time, the capacitive deionization technology is coupled with the nanofiltration / reverse osmosis technology, which can greatly improve the desalination efficiency of the device, reduce the concentration polarization effect on the membrane surface during the concentration process, reduce the structural pollution tendency of the membrane surface, improve the water production efficiency and reduce energy consumption;

[0094] The CDI nanofiltration component 2 includes a membrane shell 6 and a membrane core 7. The membrane shell 6 is arranged on the outer side of the membrane core 7. The membrane core 7 includes a filter membrane 10 and a central tube 8 fixedly arranged inside the filter membrane 10. The filter membrane 10 includes an insulating layer A101, a current collector A102, an anode plate layer 103, a guide plate A104, a nanofiltration membrane layer A11, a water production spacer 12, a nanofiltration membrane layer B13, a guide plate B105, a cathode plate layer 106, a current collector B107 and an insulating layer B108, which are stacked in sequence. The membrane core 7 is used to desalinate salt water. Under the action of the electric field, the charged ions on the surface of the nanofiltration membrane layer A and the nanofiltration membrane layer B migrate to the electrode, so that the ion concentration on the concentrated water side of the filter membrane 10 surface is greatly reduced, thereby greatly reducing the concentration polarization effect, and improving the salt retention effect and water production flux of the nanofiltration membrane layer A and the nanofiltration membrane layer B.

[0095] The water-producing spacer 12 is arranged between the nanofiltration membrane layer A11 and the nanofiltration membrane layer B13, the central tube 8 is arranged in the middle of the water-producing spacer 12, a plurality of evenly distributed water distribution ports 801 are opened on the central tube 8, the central tube 8 is arranged inside the water-producing spacer 12, and a plurality of water distribution ports 801 are arranged axially along one side of the wall of the central tube 8, and the position of the water distribution ports 801 corresponds to the inside of the filter membrane 10;

[0096] After the raw water enters from the central tube 8 and flows through the filter membrane 10 through the water distribution port 801, it evenly passes through the anode plate layer 103 and the cathode plate layer 106. The anode plate layer and the cathode plate layer are electrically connected to the external power supply through wires. Under the action of the electric field, the anions and cations in the water body are respectively adsorbed on the anode plate layer and the cathode plate layer to achieve separation, which can effectively avoid the formation of inorganic salt scaling due to nanofiltration / reverse osmosis concentration and enrichment. Under the action of pressure, a part of the water passes through the nanofiltration membrane layer A and the nanofiltration membrane layer B, and is collected in the interior of the CDI nanofiltration component 2, and flows out from the clean water outlet end cover 4, and the other part of the concentrated water flows downward from the gap between the membrane shell 6 and the filter membrane 10 through the water inlet end cover 5.

[0097] During the water inlet process, the upper end surface of the water inlet end cover 5 is provided with an inner water inlet tube 503 connected to the CDI nanofiltration component 2, and the bottoms of several inner water inlet tubes 503 are commonly connected with an inlet tube 501, which is provided at the bottom of the water inlet end cover 5. The water inlet tube 501 is connected to the central tube 8. The water inlet end cover 5 is provided with an inner water inlet tube 503 connected to the CDI nanofiltration component 2, and the bottom of the water inlet end cover 5 is connected with the inlet tube 501, so water can be added to the inside of the CDI nanofiltration component 2 through the inlet tube 501, and the central tubes 8 inside multiple CDI nanofiltration components 2 are commonly connected with the inlet tube 501, so water can be added to multiple central tubes 8 at the same time through the inlet tube 501, and the structure is simple. On the one hand, water can be diverted to increase the flow rate of water and the pressure inside the central tube 8; on the other hand, the structure is simple, easy to use, and the desalination efficiency is improved.

[0098] During the drainage process, a water-passing grid 3 is connected between the device body 1 and the clean water outlet end cover 4, a water-passing baffle 14 is connected to the upper end of the CDI nanofiltration component 2, the water-passing grid 3 is arranged above the water-passing baffle 14, the device body 1 and the water-passing grid 3 are fixedly connected by welding, a limiting baffle 15 is arranged inside the water-passing grid 3, the upper side surface of the limiting baffle 15 is lower than the upper side surface of the water-passing grid 3, a plurality of clean water holes 16 which are centrally symmetrical are opened on the limiting baffle 15, the clean water outlet end cover 4 and the device body 1 are fixedly connected by welding, which can improve the structural strength of the clean water outlet end cover 4, a water-passing grid 3 is arranged between the clean water outlet end cover 4 and the device body 1, a limiting baffle 15 is arranged inside the water-passing grid 3, and clean water holes 16 are opened on the limiting baffle 15, so that the clean water produced on the filter membrane 10 first passes through the water-passing baffle 14 on the water-producing partition net 12 and then passes through the water-passing grid 3 to enter the inside of the clean water outlet end cover 4, and is discharged through the drain pipe 401;

[0099] In addition, concentrated water through holes 504 are provided on the circumferential side of the water inlet inner tube 503, and a plurality of concentrated water through holes 504 are connected to a concentrated water discharge pipe 502, which is arranged on one side of the water inlet end cover 5, and is connected to the water inlet pipe 501. Concentrated water through holes 504 are provided around the water inlet inner tube 503, and the concentrated water through holes 504 correspond to the filter membrane 10. Concentrated water flows downward from the gap between the membrane shell 6 and the filter membrane 10, and flows into the interior of the concentrated water discharge pipe 502 through the concentrated water through holes 504 on the water inlet end cover 5, so that the purpose of discharging concentrated water can be achieved.

[0100] Moreover, the water inlet inner tube 503 is not connected to the concentrated water through hole 504, so the discharge of concentrated water can be achieved without affecting the discharge of concentrated water during the water inlet process. The structure is simple and easy to use, which greatly improves the desalination efficiency.

[0101] The bottom of the device body 1 is connected with a water inlet end cover 5 by bolts, and a rubber sealing ring 9 is arranged on the upper side of the water inlet end cover 5. The rubber sealing ring 9 is engaged with the device body 1 and is used to seal the device body 1. The water inlet end cover 5 is fixed to the bottom of the device body 1 by bolts, so the water inlet end cover 5 can be easily disassembled, and the membrane shell 6 and the membrane core 7 in the CDI nanofiltration component 2 are easily replaced, thereby improving the service life of the CDI nanofiltration component 2;

[0102] At the same time, the rubber sealing ring 9 is used to seal the device body 1 and the water inlet end cover 5. A power transmission line pipe 402 is arranged on one side of the drain pipe 401. A rubber ring is fixedly arranged inside the power transmission line pipe 402. The rubber ring seals the wire to prevent overflow when the pressure is too high, thereby improving the service life and safety of the device body 1.

[0103] The water grid 3 is connected to the clean water outlet end cover 4 by snap-fitting or fixedly connected by welding. The upper end of the clean water outlet end cover 4 is connected to a drain pipe 401, which is connected to the interior of the device body 1. The structure is simple and easy to install and fix, thereby improving the structural strength and service life of the device body 1.

[0104] A generator 24 is provided below the stirring wheel 17, and the stirring wheel 17 is provided at the output end of the generator 24. A heating component 25 is provided above the stirring wheel 17, and the generator 24 is electrically connected to the heating component 25. A plurality of evenly distributed heating strips 26 are provided on the lower side of the heating component 25, and the heating strips 26 are provided above the stirring wheel 17. The upper part of the stirring wheel 17 does not contact the heating component 25, and the stirring wheel 17 is driven to rotate in the process of sewage flowing through the concentrated water through hole 504. In the process of the stirring wheel 17 rotating, the generator 24 generates electrical energy. The generator 24 is electrically connected to the heating component 25, so the heating strips 26 on the heating component 25 can heat the sewage. In the heating process, the solubility of the salt can be improved to prevent the salt crystals from being immersed in the buffer bin 505. At the same time, the use of the spiral cleaning component 27 can greatly prevent the salt crystals from being immersed in the CDI nanofiltration component 2, thereby improving the filtration efficiency.

[0105] A magnetic block 33 is fixedly provided on the upper side of the stirring wheel 17. When the sewage enters the buffer bin 505 through the concentrated water through hole 504, the stirring wheel 17 is driven to rotate. When the stirring wheel 17 rotates, the magnetic block 33 on the stirring wheel 17 is driven to rotate. The magnetic block 33 corresponds to the magnetic alloy ring 29 at the bottom of the spiral cleaning part 27. Therefore, the spiral cleaning part 27 and the magnetic alloy ring 29 move relative to each other under the action of the magnetic field. That is to say, the rotation of the stirring wheel 17 can further drive the rotation of the spiral cleaning part 27, thereby achieving the purpose of removing dirt and greatly improving the filtration efficiency.

[0106] like Fig.10 In the desalination device shown, a separation membrane is enhanced by capacitive deionization, and the inner water inlet pipe 503 is connected to the water inlet pipe 501 through a four-way valve 506, and the four-way valve 506 is arranged below the buffer bin 505. A stirring wheel 17 is rotatably arranged inside the buffer bin 505, and the impeller of the stirring wheel 17 extends to the bottom of the concentrated water through hole 504. After the sewage flows into the buffer bin 505 through the concentrated water through hole 504, the impeller on the stirring wheel 17 rotates when the sewage flows, which can further stir the impurities inside the buffer bin 505, prevent the buffer bin 505 from being blocked, and improve the desalination efficiency.

[0107] In addition, the outer side of the concentrated water discharge pipe 502 is movably sleeved with a cleaning sleeve 21, and the interior of the concentrated water discharge pipe 502 is provided with a sewage stirring piece 18 corresponding to the cleaning sleeve 21, and the cleaning sleeve 21 is used to rotate and push the sewage stirring piece 18. The sewage stirring piece 18 is surrounded by a plurality of centrally symmetrical stirring support arms 19, and a magnetic ring 20 is fixedly provided on the outer side of the stirring support arm 19. A rubidium magnetic ring 22 is fixedly provided on the inner ring of the cleaning sleeve 21, and the magnetic properties of the rubidium magnetic ring 22 and the contact surface of the magnetic ring 20 are opposite. An anti-slip ring 23 is fixedly provided on the outer side surface of 21. The cleaning sleeve 21 corresponds to the sewage discharge stirring piece 18. The sewage discharge stirring piece 18 can be dragged inside the water inlet pipe 501 by sliding the cleaning sleeve 21. At the same time, the sewage discharge stirring piece 18 can be rotated inside the water inlet pipe 501 by rotating the cleaning sleeve 21. Therefore, the sewage discharge stirring piece 18 can be dragged by the cleaning sleeve 21 to clean the salt marsh inside the water inlet pipe 501, preventing crystallization from clogging the inside of the water inlet pipe 501 and improving the desalination efficiency.

[0108] The method of utilizing capacitive deionization to strengthen separation membrane desalination comprises the following steps:

[0109] Step 1: First, assemble and install the membrane shell 6 and the membrane core 7 on the CDI nanofiltration assembly 2, and then remove the water inlet end cover 5 by loosening the bolts;

[0110] Step 2: Fix the bottom end of the CDI nanofiltration assembly 2 on the water inlet inner tube 503 of the water inlet end cover 5;

[0111] Step 3: Pass the connecting wire on the electrode layer 103 through the transmission line tube 402 to be electrically connected to an external power source;

[0112] Step 4: Weld the water grid 3 and the purified water outlet end cover 4 to the upper end of the device body 1 in sequence;

[0113] Step 5: Fix the water inlet cover 5 to the bottom of the device body 1 with bolts:

[0114] Step 6: Finally, connect the purified water outlet end cover 4 and the water inlet end cover 5 to the outside world.

[0115] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A desalination device using capacitive deionization to enhance separation membrane, characterized by: The device comprises a device body (1), wherein the upper end of the device body (1) is provided with a purified water outlet end cover (4), the bottom of the device body (1) is provided with a water inlet end cover (5), and a plurality of CDI nanofiltration components (2) are provided inside the device body (1); a plurality of water inlet inner tubes (503) are provided on the water inlet end cover (5), and the water inlet inner tubes (503) are connected to the central tubes (8) of the corresponding CDI nanofiltration components (2); a water inlet pipe (501) is provided on the water inlet end cover (5), and the water inlet pipe (501) is connected to the plurality of water inlet inner tubes (503); A plurality of concentrated water through holes (504) are correspondingly provided on the water inlet end cover (5) on the circumference of the water inlet inner tube (503); a buffer bin (505) is provided inside the water inlet end cover (5), the buffer bin (505) is connected to the concentrated water through holes; a concentrated water discharge pipe (502) is provided on the outer wall of the water inlet end cover (5), the concentrated water discharge pipe (502) is connected to the buffer bin (505); the concentrated water discharge pipe (502) is connected to the water inlet tube (501); the water inlet inner tube (503) is not connected to the concentrated water through holes (504); The CDI nanofiltration component comprises a membrane shell (6) and a membrane core (7), wherein the membrane core (7) is located inside the membrane shell (6); the membrane core (7) comprises a filter membrane (10) in a wound structure and a central tube (8) arranged inside the filter membrane (10); the filter membrane (10) comprises an insulating layer A (101), a current collector A (102), an anode plate layer (103), a guide plate A (104), a nanofiltration membrane layer A (11), a water production spacer (12), a nanofiltration membrane layer B (13), a guide plate (14), and a filter layer (15). plate B (105), a cathode plate layer (106), a current collector B (107) and an insulating layer B (108); a plurality of adsorption holes are provided on the anode plate layer (103) and the cathode plate layer (106); the guide plate A (104) is connected to the current collector A (102) through the adsorption holes, and the guide plate B (105) is connected to the current collector B (107) through the adsorption holes; and a spiral dirt cleaning member (27) is rotatably provided on one side of the guide plate A (104) and one side of the guide plate B (105).

2. The desalination device using capacitive deionization to enhance separation membrane according to claim 1 is characterized in that: The outer side surface of the central tube (8) is provided with a spiral buffer groove (802) with a spiral structure, and a plurality of water distribution ports (801) are provided between the spiral buffer grooves (802); a foam ring (28) is fixedly provided at the upper end of the spiral cleaning member (27), and a magnetic alloy ring (29) is fixedly provided at the bottom of the spiral cleaning member (27).

3. The desalination device using capacitive deionization to enhance separation membrane according to claim 1 is characterized in that: A cleaning brush member (30) is fixedly arranged between the spiral cleaning members (27), a plurality of spiral blades (32) are arranged on the cleaning brush member (30), a pig bristle brush (31) is arranged between adjacent spiral blades (32), and the pig bristle brush (31) is in contact with the corresponding anode plate layer (103) and cathode plate layer (106).

4. The desalination device using capacitive deionization to enhance separation membrane according to claim 1 is characterized in that: The water inlet inner pipe (503) is connected to the water inlet pipe (501) via a four-way valve (506); the four-way valve (506) is arranged below the buffer bin (505); a stirring wheel (17) is rotatably arranged inside the buffer bin (505); the impeller of the stirring wheel (17) extends to directly below the concentrated water through hole (504); and a magnetic block (33) is fixedly arranged on the upper side of the stirring wheel (17).

5. The desalination device using capacitive deionization to enhance separation membrane according to claim 4 is characterized in that: A generator (24) is arranged below the stirring wheel (17), and the stirring wheel (17) is arranged at the output end of the generator (24). A heating component (25) is arranged above the stirring wheel (17), and the generator (24) and the heating component (25) are electrically connected; the heating component (25) comprises a plurality of heating strips (26), and the heating strips (26) are arranged above the stirring wheel (17).

6. The desalination device using capacitive deionization to enhance separation membrane according to claim 1 is characterized in that: The outer side surface of the concentrated water discharge pipe (502) is movably sleeved with a cleaning sleeve (21), and the interior of the concentrated water discharge pipe (502) is provided with a sewage discharge stirring piece (18) corresponding to the cleaning sleeve (21); a plurality of stirring support arms (19) are provided around the sewage discharge stirring piece (18), and a magnetic ring (20) is fixedly provided on the outer side surface of the stirring support arm (19), and a rubidium magnetic ring (22) is fixedly provided on the inner ring of the cleaning sleeve (21), and the magnetic properties of the contact surface of the rubidium magnetic ring (22) and the magnetic ring (20) are opposite, and an anti-slip ring (23) is fixedly provided on the outer side surface of the cleaning sleeve (21).

7. The desalination device using capacitive deionization to enhance separation membrane according to claim 1 is characterized in that: A water-passing grille (3) is connected between the device body (1) and the purified water outlet end cover (4); a water-passing baffle (14) is connected to the upper end of the membrane shell (6); the water-passing grille (3) is arranged above the water-passing baffle (14); a limiting baffle (15) is arranged inside the water-passing grille (3); the upper side surface of the limiting baffle (15) is lower than the upper side surface of the water-passing grille (3); a plurality of purified water holes (16) are opened on the limiting baffle (15); a drain pipe (401) is connected to the upper end of the purified water outlet end cover (4); the drain pipe (401) is communicated with the inside of the device body (1); a power transmission line pipe (402) is arranged on one side of the drain pipe (401), and a rubber ring is fixedly arranged inside the power transmission line pipe (402); and a rubber sealing ring (9) is arranged on the water inlet end cover (5).

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