Energy-saving efficient wastewater separation high-power concentration membrane device

Abstract

The invention discloses an energy-saving efficient high-power concentration membrane device for wastewater separation, and relates to the wastewater treatment technology, the energy-saving efficient high-power concentration membrane device comprises an electrodialysis device and a high-power concentration membrane system which are arranged in parallel, the upstream of the high-power concentration membrane system is also provided with a high-power concentration membrane pretreatment system, and the high-power concentration membrane pretreatment system is used for filtering insoluble substances; the invention provides an energy-saving efficient wastewater separation high-power concentration membrane device, which is characterized in that one of two sets of parallel electrodialysis devices in the prior art is changed into a high-power concentration membrane system, and a high-power concentration membrane pretreatment system is arranged in the high-power concentration membrane system; according to the high-power concentration membrane pretreatment system, impurities such as silicon react under the action of various medicaments to form insoluble substances, the insoluble substances are intercepted and removed by a pretreatment membrane, and the content of light salt brine is increased from 5% to about 15% by the high-power concentration membrane system, so that the number of electrodialysis devices is reduced, the power consumption and the maintenance cost are reduced, and meanwhile, the treatment efficiency is improved. The high-power concentration membrane pretreatment system can reduce the phenomenon that the high-power concentration membrane is polluted and blocked.

Description

Technical Field

[0001] The invention relates to wastewater separation technology, and in particular to an energy-saving and efficient wastewater separation high-concentration membrane device. Background Art

[0002] In order to remove sodium chloride, anhydrous sodium sulfate and a small amount of miscellaneous salts from wastewater, an electrodialysis device is commonly used to make anions and cations in water move in a directional manner under the action of an external DC electric field, and produce the required deionized water through the selective permeability of anion and cation exchange membranes. The general electrodialysis device mainly includes anion membrane, cation membrane, partition, electrode, clamping device and leak-proof rubber plate, among which the anion membrane and cation membrane are the most important mechanisms. The selective permeability of anion membrane and cation membrane to ions in water makes the system divided into concentrated water, fresh water and polar water, which is the desalination part of the device. The partition plays the role of supporting the anion and cation membranes and forming a concentrated and fresh water chamber with them, while the clamping device is mainly to fix the anion and cation exchange membranes, electrodes and partitions to make them a whole.

[0003] For example, the patent with the authorization announcement number CN216946345U and the authorization announcement date July 12, 2022 is named "A patent for an electrodialysis membrane assembly", which includes an electrodialysis membrane stack and two relative water distribution plates. The electrodialysis membrane stack is arranged between the two water distribution plates. A clamping plate is fixed on the outer side of the water distribution plate. The two clamping plates are connected and fixed by screws. The screws are located on the sides of the electrodialysis membrane stack. A reinforcement assembly is fixed on the upper back of the clamping plate. The reinforcement assembly includes a rectangular reinforcement frame, an intermediate connecting rod and two reinforcement rods. The intermediate connecting rod is arranged in the reinforcement frame. Both ends of the intermediate connecting rod are connected to the reinforcement frame. A card slot is provided on the reinforcement frame. The reinforcement rod spans the reinforcement frame, and the card slot is engaged with the reinforcement rod. The utility model strengthens the strength of the clamping plate by setting the reinforcement assembly, so that the clamping plate can clamp the electrodialysis membrane stack, thereby ensuring the stable operation of the electrodialysis process.

[0004] Another example is the patent with the authorization announcement number CN215876884U and the authorization announcement date of February 22, 2022, entitled "A rack structure and an electrodialysis membrane stack assembly", which belongs to the technical field of hydraulic electrodialysis membrane stack assemblies. A rack structure includes two side frames, a connecting base frame, a first connecting member, and a cross bar. The two side frames are connected by a connecting base frame, and at least one first connecting member is fixed to the front and rear outer side walls of the side frames. The cross bar is detachably connected to the first connecting member in the lateral direction. The rack structure and electrodialysis membrane stack assembly of the utility model have a detachable cross bar, so that the electrodialysis membrane assembly can be disassembled and assembled laterally, requiring little space for disassembly and assembly, and is convenient for disassembly and assembly, with high safety.

[0005] In the prior art, two sets of identical electrodialysis devices are often connected in parallel to separate and treat wastewater. Since electrodialysis relies entirely on electricity to work, the power consumption for treating wastewater is relatively high. In addition, due to the special structure and specific working process of the electrodialysis device, the failure frequency of the electrodialysis device is relatively high, and the cost of maintenance and replacement is also high. Summary of the invention

[0006] The purpose of the present invention is to provide an energy-saving and efficient wastewater separation high-concentration membrane device to solve the above-mentioned deficiencies in the prior art.

[0007] In order to achieve the above object, the present invention provides the following technical solutions: An energy-saving and efficient high-concentration membrane device for wastewater separation comprises an electrodialysis device and a high-concentration membrane system arranged in parallel. A high-concentration membrane pretreatment system is also arranged upstream of the high-concentration membrane system, and the high-concentration membrane pretreatment system is used to filter insoluble matter.

[0008] The above-mentioned energy-saving and efficient high-concentration membrane device for wastewater separation, the high-concentration membrane pretreatment system includes a pretreatment reaction tank and a pretreatment concentration tank arranged in series, the pretreatment reaction tank is added with an impurity removal agent, the pretreatment reaction tank is connected to the external water inlet passage and is used to perform preliminary impurity removal on the input wastewater, and the pretreatment concentration tank is respectively connected to the small flow pretreatment membrane group and the large flow pretreatment membrane group.

[0009] The above-mentioned energy-saving and efficient high-concentration membrane device for wastewater separation, the high-concentration membrane pretreatment system also includes a small flow pretreatment membrane group and a large flow pretreatment membrane group arranged downstream of the pretreatment concentration tank and arranged in parallel with each other.

[0010] The above-mentioned energy-saving and efficient wastewater separation high-concentration membrane device has a sludge delivery pump connected to the bottom of the pretreatment concentration tank, and also includes a sludge removal concentration tank. The sludge delivery pump is used to discharge the sludge at the bottom of the pretreatment concentration tank to the sludge removal concentration tank.

[0011] The above-mentioned energy-saving and efficient high-concentration membrane device for wastewater separation, the high-concentration membrane system includes a high-concentration membrane raw water tank arranged downstream of the small-flow pretreatment membrane group and the large-flow pretreatment membrane group.

[0012] The above-mentioned energy-saving and efficient high-concentration membrane device for wastewater separation, the high-concentration membrane system includes a first high-concentration membrane section, a second high-concentration membrane section and a third high-concentration membrane section connected in sequence.

[0013] The above-mentioned energy-saving and efficient wastewater separation high-concentration membrane device also includes a cleaning water tank and a cleaning water pump, and the cleaning water tank and the cleaning water pump are used for regularly cleaning the electrodialysis device.

[0014] The above-mentioned energy-saving and efficient wastewater separation high-concentration membrane device, the electrodialysis system includes a mounting base, a first partition is inserted on one side of the upper end of the mounting base, and a second partition is slidably installed on the other side of the upper end of the mounting base, and an electrodialysis membrane group is arranged between the first partition and the second partition.

[0015] In the above-mentioned energy-saving and efficient high-concentration membrane device for wastewater separation, a plurality of locking rods are threadedly fixed on the first partition, and the end of the locking rod away from the first partition is slidably passed through the second partition, and a locking assembly is installed on the second partition, and the locking assembly is used to synchronously lock multiple connection positions between the first partition and the second partition.

[0016] The above-mentioned energy-saving and efficient wastewater separation high-concentration membrane device, the locking assembly includes an annular locking piece threadedly connected to the locking rod near one end of the second partition, a driving gear is installed on the annular locking piece, and multiple driving gears are connected together by a transmission belt.

[0017] In the above technical scheme, the present invention provides an energy-saving and efficient high-concentration membrane device for wastewater separation, in which one of the two parallel electrodialysis devices in the prior art is changed into a high-concentration membrane system, and a high-concentration membrane pretreatment system is arranged in the high-concentration membrane system. The high-concentration membrane pretreatment system reacts with impurities such as silicon through the action of various agents to form insoluble substances which are intercepted and removed by the pretreatment membrane. The high-concentration membrane system concentrates 5% light salt water through high-concentration separation to remove water, and can increase the concentration of the salt water to about 15%. In this way, the number of electrodialysis devices is reduced, and the power consumption and maintenance costs are reduced. At the same time, the high-concentration membrane pretreatment system can reduce the phenomenon that wastewater with a high silicon content is easily blocked by the high-concentration membrane. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 A block diagram of a wastewater recovery, treatment and discharge working unit provided for one embodiment of the present invention.

[0020] Figure 2 A block diagram of a wastewater collection unit provided for one embodiment of the present invention.

[0021] Figure 3 A block diagram of a wastewater pretreatment unit provided in accordance with an embodiment of the present invention.

[0022] Figure 4A block diagram of a sodium filtration and salt concentration unit provided in accordance with an embodiment of the present invention.

[0023] Figure 5 A simplified structural diagram of a high-concentration membrane pretreatment system provided in one embodiment of the present invention.

[0024] Figure 6 A simplified structural diagram of a high-concentration membrane system provided in one embodiment of the present invention.

[0025] Figure 7 A block diagram of an evaporation crystallization unit provided for one embodiment of the present invention.

[0026] Figure 8 A schematic diagram of the three-dimensional structure of an electrodialysis system from a first perspective provided by an embodiment of the present invention.

[0027] Fig. 9 A schematic diagram of the three-dimensional structure of an electrodialysis system from a second perspective provided by an embodiment of the present invention.

[0028] Fig.10 A partial three-dimensional structural schematic diagram of an electrodialysis system provided in another embodiment of the present invention.

[0029] Fig.11 For the present invention Fig.10 A local enlarged view of point X.

[0030] Fig.12 A partial three-dimensional structural schematic diagram of a locking assembly and a connecting component provided in yet another embodiment of the present invention.

[0031] Description of reference numerals: 1. Mounting base; 2. First baffle; 21. Locking rod; 22. Locking assembly; 221. Annular locking member; 222. Driving gear; 223. Transmission belt; 226. Annular groove; 227. Stopper; 23. Connecting member; 231. Through groove; 232. Sliding shaft; 233. Connecting groove; 3. Second baffle; 4. Electrodialysis membrane group; 5. Wastewater collection unit; 6. Wastewater pretreatment unit; 7. Sodium filtration and salt concentration unit; 8. Sodium chloride concentration and purification unit; 81. Electrodialysis system; 82. High concentration Membrane system; 821, high concentration membrane raw water tank; 822, high concentration membrane security filter; 823, high concentration membrane stage one; 824, high concentration membrane stage two; 825, high concentration membrane stage three; 826, high concentration membrane booster pump; 827, high concentration membrane circulation pump; 83, high concentration membrane pretreatment system; 831, pretreatment reaction tank; 832, pretreatment concentration tank; 833, small flow pretreatment membrane group; 834, large flow pretreatment membrane group; 835, sludge removal concentration tank; 9, evaporation crystallization unit. DETAILED DESCRIPTION

[0032] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0033] like Figure 1-12 As shown, an energy-saving and efficient high-concentration membrane device for wastewater separation provided by an embodiment of the present invention comprises an electrodialysis system 81 and a high-concentration membrane system 82 arranged in parallel, and a high-concentration membrane pretreatment system 83 is also arranged upstream of the high-concentration membrane system 82, and the high-concentration membrane pretreatment system 83 is used to filter insoluble matter.

[0034] Specifically in this embodiment, the wastewater treated by the electrodialysis system 81 and the high-concentration membrane system 82 is high-sodium wastewater in which impurities such as iron, manganese, cyanide, macromolecular organic matter, sediment, colloid, organic matter, bacteria, most pathogens, colloids, etc. are basically treated. The electrodialysis system 81 and the high-concentration membrane system 82 are mainly used to further increase the concentration of sodium salts such as sodium chloride in the high-sodium wastewater, thereby reducing the energy consumption of zero-discharge sewage. Obviously, many wastewater treatment systems in the prior art have this function. In a preferred embodiment, in the entire wastewater recovery and treatment discharge process, the following working units are included in order: wastewater collection unit 5, wastewater pretreatment unit 6, sodium The filtration salt concentration unit 7, the sodium chloride concentration and purification unit 8 and the evaporation crystallization unit 9, wherein the wastewater collected by the wastewater collection unit 5 mainly comes from the industrial wastewater in the chemical industry area and the domestic wastewater in the living area. After the wastewater is collected by the wastewater collection unit 5, two processes of comprehensive sewage treatment and reclaimed water reuse are required; the wastewater pretreatment unit 6 is sequentially arranged with a homogenization regulating tank, a high-density clarification tank, a concentration tank, an ozone oxidation tank, an aerated biological filter, a mechanical filter, an ultrafiltration membrane, a resin softener and a reverse osmosis membrane, wherein the homogenization regulating tank is used to regulate the water quality, the high-density clarification tank is used to settle the sludge after the dosing reaction, and the concentration tank is used to separate and settle the mud and water before discharge , and the salt mud is discharged through plate and frame filter press. The ozone oxidation tank mainly uses ozone to treat iron, manganese, cyanide and phenol to decompose macromolecular organic matter. The aerated biological filter is used to remove suspended matter and organic matter in sewage. The mechanical filter is used to intercept and adsorb silt, colloid, metal ions and organic matter. The pore size of the ultrafiltration membrane is between 0.01 and 0.1 microns. The ultrafiltration membrane has a very high removal rate for bacteria and most pathogens, colloids, silt, etc. The resin softener is used to ensure that the resin adsorbs the residual calcium and magnesium ions in the pretreated water. The reverse osmosis membrane is used to filter most of the water molecules and other trace ions, and the residues will be discharged from the concentrated water. The sodium filtration and salt concentration unit 7 includes a common sodium filter membrane and a high-pressure sodium filter membrane arranged in sequence, and also includes a salt water tank. The salt water output by the common sodium filter membrane and the high-pressure sodium filter membrane are input into the salt water tank. The common sodium filter membrane can effectively separate monovalent and high-valent ions and output a concentrated solution, which mainly contains high-valent ions. The high-pressure sodium filter membrane is mainly used to further separate the concentrated solution and output a permeate, which mainly contains monovalent ions; the sodium chloride concentration and purification unit 8 includes a seawater desalination membrane and a double concentration membrane device in sequence (the seawater desalination membrane is a kind of reverse osmosis membrane, and the working principle is exactly the same as that of a conventional reverse osmosis membrane, except that the operating pressure is higher, reaching 4MPa.After the sewage containing monovalent and divalent salts is sent into the seawater desalination membrane by a high-pressure pump, most of the water molecules permeate through the membrane to become good water for recycling, while the sewage containing monovalent and divalent salts has a large amount of water separated out, thereby increasing the salt concentration of the sewage). The desalination salt water tank is connected to the seawater desalination membrane. The seawater desalination membrane is mainly used to increase the concentration of the brine coming out of the high-pressure sodium filter membrane to 5%. This is the treatment object of the energy-saving and high-efficiency wastewater separation high-concentration membrane device provided in this embodiment. The high-concentration membrane device is mainly used to concentrate 5% of the desalination salt water to about 15% of the concentrated brine. Among them, the high-concentration membrane device includes an electrodialysis system 81 and a high-concentration membrane system 82 arranged in parallel. The electrodialysis system 81 is a prior art and will not be described in detail. The high-concentration membrane system 82 also includes a high-concentration membrane pretreatment system 83. The high-concentration membrane pretreatment system 83 uses various agents to react with impurities such as silicon to form insoluble substances that are retained and removed by the pretreatment membrane. A part of the wastewater output from the seawater desalination membrane enters the electrodialysis system. system 81, and the other part enters the high-concentration membrane pretreatment system 83; the evaporation and crystallization unit 9 mainly includes the processes of evaporation and crystallization of sodium chloride liquid, centrifugation of sodium chloride mother liquor and drying of sodium chloride. The evaporation and crystallization of sodium chloride liquid mainly involves continuously circulating and concentrating about 15% concentrated brine in a forced circulation evaporator to reach an oversaturated state to precipitate crystals and slurry and send them to a thickener to form a mother liquor. The centrifugation of sodium chloride mother liquor mainly involves solid-liquid separation of the mother liquor, and the drying of sodium chloride mainly involves continuing to utilize the sodium chloride crystal salt after drying. In this embodiment, one of the two sets of parallel electrodialysis systems 81 in the prior art is changed into a high-concentration membrane system 82. After the high-concentration membrane system 82 separates and removes water from 5% light brine, the concentration of the brine is increased to about 15%. In this way, the number of electrodialysis systems 81 is reduced, and the frequency of failure of the total electrodialysis system 81 is reduced, and the power consumption and maintenance cost are reduced. At the same time, the high-concentration membrane pretreatment system 83 can reduce the phenomenon that wastewater with a high silicon content is easily blocked by the high-concentration membrane.

[0035] In another embodiment provided by the present invention, the high-concentration membrane pretreatment system 83 includes a pretreatment reaction tank 831 and a pretreatment concentration tank 832 arranged in series, and an impurity removal agent is added to the pretreatment reaction tank 831, and the impurity removal agent is mainly sodium hydroxide and a silicon removal magnesium agent. The specific steps of adding the impurity removal agent are: first, sodium hydroxide is added to the pretreatment reaction tank 831 to adjust the pH to a suitable alkaline range, and then a silicon removal magnesium agent whose main component is magnesium oxide is added. Magnesium oxide silicon removal is that magnesium oxide particles are partially hydrated in water to form a complex molecular structure of MgO and Mg(OH)2, and Mg(OH)2 molecules partially dissociate into the solution, thereby forming complex colloidal particles with positive charges surrounded by OH-. Silicate compounds in different forms in water can be ion exchanged with magnesium oxide colloidal particles to form small particles of insoluble magnesium silicate compounds, and then flocculants are used to convert small particles into large particles for sedimentation and separation, thereby achieving the purpose of silicon removal. The pretreatment reaction tank 831 is connected to an external water inlet passage and is used to perform preliminary impurity removal on the input wastewater, and the pretreatment concentration tank 832 performs preliminary concentration on the impurity-removed wastewater.

[0036] In another embodiment provided by the present invention, the high-concentration membrane pretreatment system 83 also includes a small flow pretreatment membrane group 833 and a large flow pretreatment membrane group 834 (collectively referred to as pretreatment membrane groups) arranged downstream of the pretreatment concentration tank 832 and arranged in parallel with each other, and also includes a small flow pretreatment membrane circulation pump connected to the small flow pretreatment membrane group 833, and a large flow pretreatment membrane circulation pump connected to the large flow pretreatment membrane group 834; the pretreatment concentration tank 832 is respectively connected to the small flow pretreatment membrane group 833 and the large flow pretreatment membrane group 834. Of course, in this embodiment, there are also a flow sensor and a first three-way valve, The flow sensor is used to detect the flow rate of water output from the pretreatment concentration tank 832, and the first three-way valve is used to switch the pipeline between the pretreatment concentration tank 832 and the small flow pretreatment membrane group 833 and the large flow pretreatment membrane group 834; specifically, when the treated water volume is less than 20m³ / h, the small flow pretreatment membrane group 833 is enabled; when the treated water volume is 20-30m³ / h, the large flow pretreatment membrane group 834 is enabled; thereby achieving the purpose of saving power consumption; of course, the pretreatment membrane group does not run continuously for 24 hours, and can be manually switched at any time, so that different pretreatment schemes are used for different flow rates to save power consumption.

[0037] In another embodiment provided by the present invention, a sludge discharge pump is connected to the bottom of the pretreatment concentration tank 832 , and a sludge removal concentration tank 835 is also included. The sludge discharge pump is used to discharge the sludge at the bottom of the pretreatment concentration tank 832 to the sludge removal concentration tank 835 .

[0038] In another embodiment provided by the present invention, the high-concentration membrane system 82 also includes a high-concentration membrane raw water tank 821 arranged downstream of the small-flow pretreatment membrane group 833 and the large-flow pretreatment membrane group 834, the high-concentration membrane raw water tank 821 is used to store brine with a qualified concentration, and a high-concentration membrane water pump A and a high-concentration membrane water pump B (collectively referred to as water pumps) connected in parallel are arranged downstream of the high-concentration membrane raw water tank 821. The high-concentration membrane water pump A and the high-concentration membrane water pump B are arranged to ensure that the water pumps can still maintain stable operation under a large flow rate, and a high-concentration membrane security filter 822 is arranged downstream of the high-concentration membrane water pump A and the high-concentration membrane water pump B. The high-concentration membrane security filter 822 is mainly used to remove particulate impurities, and a high-concentration membrane high-pressure pump is arranged downstream of the high-concentration membrane security filter 822, and the high-concentration membrane high-pressure pump is mainly used to provide necessary pressure.

[0039] In another embodiment provided by the present invention, the high-concentration membrane system 82 includes a high-concentration membrane section 1 823, a high-concentration membrane section 2 824, and a high-concentration membrane section 3 825 which are sequentially connected to the downstream of the high-concentration membrane high-pressure pump, a high-concentration membrane booster pump 826 and a high-concentration membrane circulation pump 827 are connected between the high-concentration membrane section 1 823 and the high-concentration membrane section 2 824, and the brine is continuously concentrated by the high-concentration membrane section 1 823, the high-concentration membrane section 2 824, and the high-concentration membrane section 3 825. A concentrated brine production tank is provided downstream of the high-concentration membrane section 3 825, and the concentrated brine production tank is provided downstream of the high-concentration membrane section 3 825. The water tank is mainly used to store and output concentrated water. The specific working process of the high-concentration membrane system 82 is as follows: 5% of the desalinated water after the desalination membrane treatment enters the pretreatment reaction tank 831, where various agents remove impurities such as silicon. The desalinated water then enters the pretreatment concentration tank 832 for pre-concentration treatment. The concentrated brine enters the pretreatment membrane group, and the insoluble matter deposited after the preliminary pretreatment enters the sludge removal concentration tank 835. After the preliminary pretreatment of the brine, the pretreatment membrane group inputs the qualified brine into the high-concentration membrane raw water tank 821, and then passes through the water supply pump, the high-concentration membrane security filter 822 and After the high concentration membrane high pressure pump, it enters the high concentration membrane stage 1 823. The water (main component) separated by the high concentration membrane stage 1 823 can be output to the reverse osmosis membrane or the sodium filtration and salt concentration unit 7, or it can be returned to the high concentration membrane raw water tank 821 depending on the analysis results. The concentrated brine separated by the high concentration membrane stage 1 823 is sent to the high concentration membrane stage 2 824 and the high concentration membrane stage 3 825 through the high concentration membrane additional pump and the high concentration membrane circulating water pump. The water separated by the high concentration membrane stage 2 824 and the high concentration membrane stage 3 825 can also be output to the reverse osmosis membrane or the sodium filtration and salt concentration unit 7 or returned to the high concentration membrane raw water. Box 821, and the re-concentrated brine separated by the high-concentrating membrane second section 824 and the high-concentrating membrane third section 825 enters the circulation concentration if the concentration is not up to standard, and enters the original electrodialysis concentrated brine water production tank if the concentration reaches about 15%, and then is sent to the evaporation crystallization unit 9 through the concentrated brine water production tank to convert the concentrated brine into solid sodium chloride for reuse. In this way, the high-concentrating membrane first section 823, the high-concentrating membrane second section 824 and the high-concentrating membrane third section 825 are used to continuously circulate and concentrate the brine. Through multi-stage continuous processing, the stable operation of the high-concentrating membrane system 82 can be ensured, and failures and downtime can be reduced.

[0040] In another embodiment provided by the present invention, the sodium chloride concentration and purification unit 8 further includes a cleaning water tank and a cleaning water pump, and the cleaning water tank and the cleaning water pump are mainly used for regularly cleaning the anion membrane and the cation membrane in the electrodialysis system 81.

[0041] In another embodiment provided by the present invention, the specific structure of the electrodialysis system 81 generally includes an electrodialysis membrane group 4, and the electrodialysis membrane group 4 is generally composed of an anion membrane, an cation membrane, positive and negative electrodes and a partition stacked and pressed in a certain order, and the anion membrane, the cation membrane, the positive and negative electrodes and the partition are all sheet structures. When pressed to form a whole, multiple positions of the electrodialysis membrane group 4 need to be symmetrically locked. This is to ensure that the anion membrane, the cation membrane, the positive and negative electrodes and the partition can be in stable and close contact. When the electrodialysis system 81 is installed, it is generally necessary to start locking from the middle of the electrodialysis, and it is required that the forces at multiple positions during locking are symmetrical and uniform, and excessive force should not be applied on one side. This is to ensure that the entire electrodialysis system 81 is uniformly stressed and avoid the situation where the local force is too large or too small. This can effectively prevent equipment damage or water leakage caused by improper clamping. However, in the prior art, it is usually done by working The staff performs locking and debugging based on their experience and feel. In this way, the installation effect of the electrodialysis system 81 mainly depends on the experience of the staff, which is obviously not conducive to the installation, disassembly and maintenance of the electrodialysis system 81. For this reason, the present embodiment provides a further solution. The electrodialysis system 81 includes a mounting base 1, a first partition plate 2 is inserted on one side of the upper end of the mounting base 1, and a second partition plate 3 is slidably installed on the other side of the upper end of the mounting base 1. An electrodialysis membrane group 4 is provided between the first partition plate 2 and the second partition plate 3. The first partition plate 2 and the second partition plate 3 are preferably square plate-shaped structures. The electrodialysis membrane group 4 includes a negative membrane, a positive membrane and an electrode, etc. The working principle, working process and specific structure of the electrodialysis membrane group 4 are all prior art and will not be described in detail. During installation, the first partition plate 2 is first inserted into the mounting base 1, and then the first partition plate 2 is placed horizontally (with the mounting base 1) by hoisting. Figure 8 The electrodialysis membrane group 4 is then laid horizontally on the first partition plate 2, and then the anion membrane, cation membrane and electrodes in the electrodialysis membrane group 4 are placed in sequence on the first partition plate 2. Finally, the second partition plate 3 is slidably installed on the mounting base 1 to clamp the electrodialysis membrane group 4 between the first partition plate 2 and the second partition plate 3.

[0042] In another embodiment provided by the present invention, a plurality of locking rods 21 are threadedly fixed on the first partition 2, and the locking rods 21 are preferably a circular rod-shaped structure. The end of the locking rod 21 away from the first partition 2 is slidably penetrated on the second partition 3, and the first partition 2 and the second partition 3 are arranged in parallel. The locking rods 21 are perpendicular to the first partition 2. The number of the locking rods 21 is at least eight and the number of the locking rods 21 is an even number. This is to avoid the situation where the unilateral locking force is too large. Preferably, the plurality of locking rods 21 in the same horizontal plane are relatively arranged to ensure the symmetry of the force positions. The locking rods 21 are provided with threads on the side close to the second partition 3, and a locking assembly 22 is installed on the second partition 3. The locking assembly 22 is used to synchronously lock the multiple connection positions between the first partition 2 and the second partition 3. When the second partition 3 is installed on the mounting base 1 and contacts the electrodialysis membrane group 4, the multiple connection positions are synchronously locked by the locking assembly 22. In this way, the situation where the local force is too large or too small can be avoided.

[0043] In another embodiment provided by the present invention, the locking assembly 22 includes an annular locking piece 221 threadedly connected to one end of the locking rod 21 near the second partition 3, the annular locking piece 221 is an annular block structure, a driving gear 222 is installed on the annular locking piece 221, the driving gear 222 coincides with the central axis of the annular locking piece 221, and a plurality of the driving gears 222 are connected together by a transmission belt 223, the transmission belt 223 has a certain elasticity, and the transmission belt 223 is meshed with each of the driving gears 222, so that when one of the driving gears 222 is driven to rotate, the plurality of driving gears 222 rotate synchronously and make the plurality of annular locking pieces 221 move inward synchronously to squeeze the second partition 3, so that external force can be used. For example, one of the driving gears 222 is driven to rotate manually; when locking is performed through the locking assembly 22, the gear 222 is driven to rotate by external force and drives the transmission belt 223 to move, and the transmission belt 223 drives multiple driving gears 222 to rotate synchronously, thereby driving multiple annular locking members 221 to rotate synchronously and squeeze the second partition 3, so that the second partition 3 is pressed against the electrodialysis membrane group 4. In this way, the electrodialysis membrane group 4 is locked between the second partition 3 and the first partition 2 through the locking assembly 22, and multiple annular locking members 221 are squeezed inward synchronously, and the forces at multiple pressing positions are symmetrical and uniform, which can avoid the situation where local forces are too large or too small. The technical problem to be solved at this time is the problem of different pressures applied to the second partition 3 during the locking process.

[0044] During installation, after the first partition 2 is installed, the first partition 2 is placed horizontally and the electrodialysis membrane group 4 is installed, and then the second partition 3 is slid through the locking rod 21, and then the annular locking piece 221 is screwed on the end of the locking rod 21 close to the second partition 3. Here, the end of the annular locking piece 221 needs to be flush with the end of the locking rod 21, so as to ensure the initial state of the annular locking piece 221, which is conducive to synchronous locking and extrusion, and then the transmission belt 223 is installed between the driving gears 222. In this way, the installation of the locking assembly 22 is completed.

[0045] Furthermore, during the rotation of the annular locking member 221, the annular locking member 221 will also move in the direction of squeezing the second partition plate 3. That is to say, the movement of the annular locking member 221 is a combination of rotation and axial movement, and the transmission belt 223 is meshed and connected between each driving gear 222. If the synchronization degree of the movement of the annular locking member 221 is insufficient (due to the difference in the initial position of the annular locking member 221, the thread pitch, or the pitch of the tooth protrusions on the transmission belt 223), the transmission belt 223 will be deviated sideways, seriously affecting the movement of each annular locking member 221. For this reason, the present embodiment provides a further solution. It should be noted that, in the present embodiment, the annular locking member 221 and the driving gear 222 are no longer directly mounted together, and an annular groove 226 is provided on the outer surface of the second partition plate 3, and the annular groove 226 coincides with the axis of the locking rod 21. A limit member 227 is rotatably installed in the annular groove 226, and the driving gear The wheel 222 is fixed to one end of the limiting member 227 away from the annular groove 226, and the driving gear 222 is connected to the annular locking member 221 by a connecting member 23. In this embodiment, the connecting member 23 is preferably a spring rod; specifically, during operation, when the driving gear 222 rotates, the limiting member 227 rotates synchronously in the annular groove 226, so that the driving gear 222 is provided with a working condition for rotating with the locking rod 21 as the center of the circle. When the driving gear 222 rotates, the spring rod also moves accordingly and synchronously drives the annular locking member 221 to rotate. When the annular locking member 221 rotates, it also moves axially and stretches the spring rod. In this way, the driving gear 222 will not move axially along the locking rod 21 when it moves, and will not cause the transmission belt 223 to deviate laterally. On the premise of ensuring that the driving gear 222 can drive the annular locking member 221 to move, the driving gear 222 is prevented from moving axially, thereby improving the stability of the driving gear 222 and the transmission belt 223 when they move.

[0046] Obviously, from the above technical problems, it can be known that due to the different initial positions of the annular locking members 221, the thread pitch or the pitch of the tooth protrusions on the transmission belt 223, it is easy to cause the actual pressures finally given to the second partition 3 by each annular locking member 221 to be different, which is not conducive to the assembly of the electrodialysis membrane group 4. For this reason, the present embodiment provides a further solution, and an annular pressure sensor is installed at one end of the annular locking member 221 close to the second partition 3. The annular pressure sensor is used to detect the pressure (defined as locking pressure) given to the second partition 3 by each annular locking member 221. The annular pressure sensor is a prior art and will not be described in detail here. When multiple annular locking members 221 are simultaneously After the first step of rotation and locking, the pressure applied to the second partition 3 by each annular locking member 221 is detected by an annular pressure sensor. If the locking pressure of one or a few annular locking members 221 deviates from the locking pressure of most annular locking members 221, the annular locking members 221 are manually adjusted one by one. At this time, it is only necessary to separate the transmission belt 223 from the manually adjusted annular locking member 221 (such as pulling the connection between the transmission belt 223 and the annular locking member 221 outward so that the transmission belt 223 and the annular locking member 221 are no longer meshed together), and then adjust them individually. In this way, the actual pressure applied to the second partition 3 by each annular locking member 221 can be the same.

[0047] Furthermore, in the above embodiment, the connecting component 23 is fixedly connected between the annular locking member 221 and the driving gear 222. When the annular locking member 221 or the driving gear 222 needs to be removed separately, it is inconvenient. For this reason, the present embodiment provides a further solution. In the present embodiment, the connecting component 23 includes a through groove 231 provided on the driving gear 222, and a sliding shaft 232 is slidably installed in the through groove 231. A connecting groove 233 is provided at one end of the annular locking member 221 close to the driving gear 222, and the sliding shaft 232 can be plugged and unplugged in the connecting groove 233. In this way, when the driving gear 222 rotates, the annular locking member 221 is driven by the sliding shaft 232. 21 rotates synchronously, and when the annular locking member 221 moves axially, the sliding shaft 232 slides in the through groove 231. When the annular locking member 221 and the driving gear 222 need to be separated and unloaded, it is only necessary to pull out the sliding shaft 232 by force. In this way, it is convenient to disassemble the annular locking member 221 or the driving gear 222 separately. This also provides another solution for the separate adjustment of the annular locking member 221. In this solution, there is no need to manually pull the transmission belt 223. It is only necessary to remove the transmission structure between the annular locking member 221 and the driving gear 222. This solution can be used in situations where it is not suitable to pull the transmission belt 223 outward or the transmission belt 223 is too hard to be pulled outward to be separated from the driving gear 222.

[0048] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. An energy-saving and efficient wastewater separation high-concentration membrane device, characterized in that: The invention comprises an electrodialysis device and a high-concentration membrane system which are arranged in parallel. A high-concentration membrane pretreatment system is also arranged upstream of the high-concentration membrane system. The high-concentration membrane pretreatment system is used for filtering insoluble matters.

2. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 1 is characterized in that: The high-concentration membrane pretreatment system includes a pretreatment reaction tank and a pretreatment concentration tank arranged in series, the pretreatment reaction tank is added with an impurity removal agent, the pretreatment reaction tank is connected to an external water inlet passage and is used to perform preliminary impurity removal on the input wastewater, and the pretreatment concentration tank is respectively connected to a small-flow pretreatment membrane group and a large-flow pretreatment membrane group.

3. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 2 is characterized in that: The high-concentration membrane pretreatment system further comprises a small-flow pretreatment membrane group and a large-flow pretreatment membrane group which are arranged downstream of the pretreatment concentration tank and are arranged in parallel with each other.

4. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 3 is characterized in that: The bottom of the pretreatment concentration tank is also connected to a sludge delivery pump, and also includes a desludge concentration tank. The sludge delivery pump is used to discharge the sludge at the bottom of the pretreatment concentration tank to the desludge concentration tank.

5. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 1 is characterized in that: The high-concentration membrane system comprises a high-concentration membrane raw water tank arranged downstream of a small-flow pretreatment membrane group and a large-flow pretreatment membrane group.

6. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 1 is characterized in that: The high-concentration membrane system comprises a first high-concentration membrane section, a second high-concentration membrane section and a third high-concentration membrane section which are connected in sequence.

7. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 1 is characterized in that: It also includes a cleaning water tank and a cleaning water pump, and the cleaning water tank and the cleaning water pump are used for regularly cleaning the electrodialysis device.

8. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 1 is characterized in that: The electrodialysis system comprises a mounting base, a first partition is inserted on one side of the upper end of the mounting base, a second partition is slidably mounted on the other side of the upper end of the mounting base, and an electrodialysis membrane group is arranged between the first partition and the second partition.

9. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 8 is characterized in that: A plurality of locking rods are threadedly fixed on the first partition, and one end of the locking rod away from the first partition is slidably passed through the second partition. A locking assembly is installed on the second partition, and the locking assembly is used to synchronously lock multiple connection positions between the first partition and the second partition.

10. The energy-saving and high-efficiency wastewater separation high-concentration membrane device according to claim 9, characterized in that: The locking assembly comprises an annular locking piece threadedly connected to one end of the locking rod close to the second partition plate, a driving gear is mounted on the annular locking piece, and a plurality of the driving gears are connected together by a transmission belt.

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