Wastewater resourceful treatment system

Abstract

The utility model relates to the technical field of wastewater treatment, in particular to a wastewater resourceful treatment system. The utility model provides a wastewater resourceful treatment system. The wastewater resourceful treatment system comprises an under-pressure filtering device, an oil removal device, an activated carbon filtering device, a heavy metal removal filtering device, an ultrafiltration device and an electrodialysis device which are sequentially connected and communicated, the under-pressure filtering device can remove suspended impurities in the wastewater to obtain primarily filtered feed liquid; oil removal resin is arranged in the oil removal device so as to remove oil in the primarily filtered material liquid to obtain oil-removed produced water; the activated carbon filtering device, the heavy metal removal filtering device and the ultrafiltration device are sequentially used for filtering the oil-removed produced water to obtain ultrafiltration produced water; and the electrodialysis device is used for carrying out electrodialysis treatment on the ultrafiltration produced water to respectively obtain acid liquor, alkali liquor and dilute brine. By means of the wastewater resourceful treatment system, acid and alkali can be prepared from wastewater, and the problems that in a wastewater treatment system, many activated carbon hazardous waste is generated, and the economical efficiency is poor are solved.

Description

Technical Field

[0001] The present application relates to the technical field of wastewater treatment, and in particular to a wastewater resource treatment system. Background Art

[0002] In the wet process preparation of precursors for lithium battery ternary positive electrode materials, sulfuric acid and alkali, which are relatively expensive, are usually used as raw materials to regulate the pH of the reaction system during the preparation process, and a large amount of sulfate wastewater is generated during the production process.

[0003] At present, sulfate wastewater treatment systems produce a lot of hazardous activated carbon waste and have poor economic efficiency. Utility Model Content

[0004] The present application provides a wastewater resource treatment system to solve or alleviate at least one technical problem in the above-mentioned prior art.

[0005] According to the present application, a wastewater resource treatment system includes a pressurized filtration device, an oil removal device, an activated carbon filtration device, a weight removal filtration device, an ultrafiltration device and an electrodialysis device which are connected and communicated in sequence; the pressurized filtration device is used to remove suspended impurities in the wastewater and obtain a primary filtration liquid, and the primary filtration liquid is sent to the oil removal device under the action of the internal pressure; the oil removal device is connected and connected between the pressurized filtration device and the activated carbon filtration device, and an oil removal resin is provided in the oil removal device to remove the oil in the primary filtration liquid to obtain oil-free water; the activated carbon filtration device, the weight removal filtration device and the ultrafiltration device are used to filter the oil-free water in sequence to obtain ultrafiltration water; the electrodialysis device is used to perform electrodialysis treatment on the ultrafiltration water to obtain acid solution, alkali solution and dilute brine respectively.

[0006] The present application designs the structure of the wastewater resource treatment system, wherein the pressure filter device is connected and communicated with the oil removal device, thereby being able to filter out suspended matter in the sodium sulfate wastewater and reduce the subsequent oil removal pressure. Since the wastewater is filtered under pressure in the pressure filter device, the obtained primary filter liquid can be transported into the oil removal device under the action of the residual pressure of the pressure filter device, thereby reducing the system flow pressure change and improving the system operation stability.

[0007] The oil removal device is connected to the activated carbon filter device. Since the activated carbon in the activated carbon filter device is relatively expensive and difficult to regenerate, the oil removal resin provided in the oil removal device is easy to regenerate multiple times. The oil removal resin in the oil removal device removes oil from the primary filter liquid, thereby facilitating the full removal of oil while reducing the oil absorption load and usage of the activated carbon, thus avoiding the generation of a large amount of carbon hazardous waste. In addition, due to the improvement of the flow and pressure stability of the aforementioned system, the oil removal effect is improved, the usage of activated carbon and the generation of carbon hazardous waste are further reduced, thereby reducing production costs and promoting environmental protection.

[0008] The oil-removed water undergoes multi-stage filtration treatment via an activated carbon filtration device, a weight removal filtration device, and an ultrafiltration device that are sequentially connected and communicated. The ultrafiltration water obtained has low oil and impurity content and can meet the water inlet requirements of the electrodialysis device. The ultrafiltration water undergoes electrodialysis treatment via the electrodialysis device to generate acid solution, alkali solution, and dilute brine respectively. The acid solution and alkali solution are further concentrated or purified for recycling to reduce the cost of acid and alkali solution raw materials in the process of generating the positive electrode material precursor and realize self-sufficient supply of acid and alkali.

[0009] Therefore, the wastewater resource treatment system provided in this application uses wastewater to produce acid liquid and alkali liquid, which effectively alleviates the problems of high acid and alkali costs and supply shortages in the production process of positive electrode materials. Especially when the wastewater treated is sulfate wastewater, it has a high degree of matching with the acid and alkali material types used in the production process of positive electrode materials, improves the economy of wastewater treatment, reduces the use of activated carbon, and avoids the large-scale generation of carbon hazardous waste.

[0010] In some embodiments, the wastewater resource recovery treatment system further includes a nanofiltration device, which is connected to the electrodialysis device. The nanofiltration device is used to purify the received alkali solution to obtain nanofiltration clear liquid and nanofiltration concentrate.

[0011] In some embodiments, the oil removal device includes an oil removal filter unit, an oil removal resin unit and an oil removal water production tank; the discharge port of the oil removal filter unit is connected to the feed port of the oil removal resin unit, and the feed port of the oil removal filter unit is connected to the discharge port of the pressure filtration device, and the oil removal resin unit is provided with oil removal resin; the feed port of the oil removal water production tank is respectively connected to the discharge ports of the ultrafiltration device and the oil removal resin unit, and the discharge port of the oil removal water production tank is connected to the feed port of the activated carbon filtration device.

[0012] In some embodiments, the oil removal device further includes a resin regeneration agent supplier; the discharge port of the resin regeneration agent supplier is connected to the oil removal resin unit for supplying the resin regeneration agent to the oil removal resin unit.

[0013] In some embodiments, the nanofiltration device includes a dilute alkali box, a preservation fine filter, and a nanofiltration membrane assembly that are connected in sequence; the feed port of the dilute alkali box is connected to the electrodialysis device, and is used to receive the alkali solution obtained by the electrodialysis device, the preservation fine filter is used to treat the alkali solution to obtain fine filtrate alkali, and the nanofiltration membrane assembly is used to perform nanofiltration treatment on the fine filtrate alkali to obtain nanofiltration clear liquid and nanofiltration concentrate.

[0014] In some embodiments, the wastewater resource treatment system also includes a reverse osmosis device, which is connected to the electrodialysis device and the nanofiltration device. The reverse osmosis device is used to perform multi-stage reverse osmosis filtration on the dilute brine and nanofiltration concentrate to obtain reverse osmosis regenerated liquid and pure water.

[0015] In some embodiments, the activated carbon filtration device includes an activated carbon filter and an activated carbon water production tank; the feed port of the activated carbon filter is connected to the discharge port of the oil removal water production tank, and the discharge port of the activated carbon filter is connected to the feed port of the activated carbon water production tank; the discharge port of the activated carbon water production tank is connected to the feed port of the weight removal filtration device, and the feed port of the activated carbon water production tank is also connected to the discharge port of the reverse osmosis device; optionally, the pressure filtration device is a multi-media filter, and filter material is provided in the multi-media filter to reduce the turbidity of the wastewater.

[0016] In some embodiments, the weight removal filtration device includes a resin weight removal filter, a resin regeneration liquid supplier and a weight removal water production tank; a chelating resin is provided in the resin weight removal filter, the feed port of the resin weight removal filter is connected to the discharge port of the activated carbon water production tank, and the discharge port of the resin weight removal filter is connected to the feed port of the weight removal water production tank, so as to remove heavy metal ions in the activated carbon water production to obtain weight removal water and weight removal regeneration liquid; the discharge port of the weight removal water production tank is connected to the feed port of the ultrafiltration device; the discharge port of the resin regeneration liquid supplier is connected to the resin weight removal filter, so as to supply resin regeneration liquid to the resin weight removal filter.

[0017] In some embodiments, the wastewater resource treatment system also includes a pure water tank, the electrodialysis device includes an acid chamber, an alkali chamber and a salt chamber; the feed port of the pure water tank is connected to the discharge port of the reverse osmosis device, and the discharge port of the pure water tank is respectively connected to the feed ports of the acid chamber and the alkali chamber; the feed port of the salt chamber is connected to the discharge port of the ultrafiltration device, the discharge port of the acid chamber is used to connect to the acid evaporator, and the discharge port of the alkali chamber is used to connect to the nanofiltration device or the alkali evaporator; the reverse osmosis device includes a dilute brine tank, a first-stage reverse osmosis filter, a first-stage reverse osmosis water production tank, a second-stage reverse osmosis filter, a second-stage reverse osmosis water production tank and a third-stage reverse osmosis filter connected in sequence, the feed port of the dilute brine tank is respectively connected to the discharge ports of the salt chamber and the nanofiltration device, the discharge port of the first-stage reverse osmosis filter is connected to the activated carbon water production tank, and the discharge port of the second-stage reverse osmosis filter is also connected to the dilute brine tank.

[0018] In some embodiments, the wastewater resource treatment system also includes positive electrode material precursor production equipment, which is connected to a pressure filtration device to transport the wastewater into the pressure filtration device; the positive electrode material precursor production equipment is also connected to an electrodialysis device and a nanofiltration device, respectively, to receive and reuse the acid solution and the nanofiltration clear liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the specific embodiments of this application or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0020] Figure 1 A schematic diagram of the wastewater resource treatment system structure provided in an embodiment of the present application;

[0021] Figure 2 A schematic diagram of the structure of a wastewater resource treatment system provided in another embodiment of the present application;

[0022] Figure 3 A schematic structural diagram of a nanofiltration device provided in another embodiment of the present application;

[0023] Figure 4 This is a schematic structural diagram of a nanofiltration device provided in another embodiment of the present application.

[0024] The reference numerals are as follows:

[0025] 10. Pressure filtration device;

[0026] 20. Oil removal device; 21. Oil removal filter element unit; 22. Oil removal resin unit; 23. Oil removal water tank; 24. Resin regeneration agent feeder;

[0027] 30. Activated carbon filtration device; 31. Activated carbon filter; 32. Activated carbon water production tank;

[0028] 40. Degravity filter; 41. Resin degravity filter; 42. Resin regeneration liquid supplier; 43. Degravity production water tank;

[0029] 50. Ultrafiltration device; 51. Ultrafiltration membrane assembly; 52. Ultrafiltration water production tank;

[0030] 60. Electrodialysis device;

[0031] 70. Nanofiltration device; 71. Dilute alkali tank; 72. Preservation fine filter; 73. Nanofiltration membrane assembly; 731. Primary nanofiltration membrane unit; 732. Primary dialysate tank; 733. Secondary nanofiltration membrane unit; 734. Secondary dialysate tank;

[0032] 80. Reverse osmosis device; 81. Brine tank; 82. First-stage reverse osmosis filter; 83. First-stage reverse osmosis water production tank; 84. Second-stage reverse osmosis filter; 85. Second-stage reverse osmosis water production tank; 86. Third-stage reverse osmosis filter;

[0033] 90. Pure water tank;

[0034] 100. Wastewater collection tank;

[0035] 1000. Cathode material precursor production equipment. DETAILED DESCRIPTION

[0036] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear to indicate the orientation or position relationship, unless otherwise specified, they are understood to be based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting this application.

[0037] Furthermore, the use of "first" or "second" in describing features is for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features identified. Features identified as "first" or "second" may explicitly or implicitly include at least one of the identified features. The use of the word "plurality" generally implies at least two, such as two or three, unless otherwise specifically defined.

[0038] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integration; mechanical connections, electrical connections, direct connections, or indirect connections through an intermediary; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0039] In the description of this specification, if the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" appear, it means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0040] It should be noted that the wastewater in the embodiment of the present application can be sodium sulfate wastewater, potassium sulfate wastewater or lithium sulfate wastewater generated during the wet preparation process of the precursor of the positive electrode material, and can all be applied to the wastewater resource treatment system provided in the embodiment of the present application for resource treatment.

[0041] In response to the defects of the wastewater treatment system in the prior art, the general concept of the embodiment of the present application is to provide a wastewater resource treatment system, which includes a pressurized filtration device 10, an oil removal device 20, an activated carbon filtration device 30, a weight removal filtration device 40, an ultrafiltration device 50 and an electrodialysis device 60 that are connected and communicated in sequence; through the structural design of the wastewater resource treatment system, the wastewater is sequentially removed from the wastewater by using a pressurized filtration device 10 and an oil removal device 20 provided with an oil removal resin, and then transported to the activated carbon filtration device 30 for activated carbon filtration, which can effectively reduce the use of activated carbon and avoid the large-scale generation of hazardous activated carbon waste.

[0042] In addition, the deoiled water obtained by the oil removal device 20 is filtered in turn through the activated carbon filter device 30, the weight removal filter device 40 and the ultrafiltration device 50. The obtained ultrafiltration water has a low impurity content and can meet the liquid inlet demand of the electrodialysis device 60. After the ultrafiltration water is subjected to electrodialysis treatment by the electrodialysis device 60, acid solution, alkali solution and dilute brine are obtained respectively. The acid solution and alkali solution can be further concentrated or purified and recycled to reduce the cost of acid and alkali solution raw materials in the process of generating positive electrode material precursors, realize self-sufficient supply of acid and alkali, and thereby improve the economy of wastewater treatment.

[0043] Based on the above general concept, reference Figure 1-4 As shown, an embodiment of the present application provides a wastewater resource treatment system, comprising a pressurized filtration device 10, an oil removal device 20, an activated carbon filtration device 30, a weight removal filtration device 40, an ultrafiltration device 50 and an electrodialysis device 60 which are connected and communicated in sequence; the pressurized filtration device 10 is used to remove suspended impurities in the wastewater and obtain a primary filter liquid, and the primary filter liquid is sent to the oil removal device 20 under the action of the internal pressure thereof; an oil removal resin is provided in the oil removal device 20 for removing the oil in the primary filter liquid to obtain oil-free water; the activated carbon filtration device 30, the weight removal filtration device 40 and the ultrafiltration device 50 are used in sequence to filter the oil-free water to obtain ultrafiltration water; the electrodialysis device 60 is used to perform electrodialysis treatment on the ultrafiltration water to obtain acid solution, alkali solution and dilute brine, respectively.

[0044] It can be understood that during the treatment of wastewater through the pressure filtration device 10, the pressure filtration device 10 can remove suspended impurities in the wastewater under pressure to obtain a primary filter liquid with lower turbidity, and the primary filter liquid does not need to be pumped, and can enter the oil removal device 20 through the residual pressure supply of the pressure filtration device 10, so as to avoid the system flow pressure changes caused by the pumping pressure and improve the system operation stability.

[0045] Since activated carbon is difficult to be completely regenerated multiple times after it is saturated with adsorption, the cost is relatively high. The oil removal device 20 of this embodiment is provided with an oil removal resin. The oil removal resin is easier to regenerate than activated carbon. The primary filter liquid is subjected to the oil removal resin to remove the oil and then transported to the activated carbon filter device 30 for filtration treatment, which is beneficial to the deep removal of oil, while reducing the oil absorption load and usage of activated carbon, avoiding the generation of a large amount of carbon hazardous waste, and benefiting from the improvement of the flow pressure stability of the aforementioned system, which is beneficial to improving the oil removal effect, further reducing the usage of activated carbon and the generation of carbon hazardous waste, thereby reducing production costs and promoting environmental protection.

[0046] Furthermore, after the oil removal device 20 removes non-polar substances or poorly water-soluble organic oil in the primary filter liquid, the obtained oil-free water is filtered and treated in sequence by the activated carbon filter device 30, the weight removal filter device 40, and the ultrafiltration device 50. The activated carbon filter device 30 can further adsorb and remove organic matter, colloidal silicon, residual chlorine (Cl2) and heavy metal ion impurities in the oil-free water. The weight removal filter device 40 can further remove heavy metal ions contained in the feed liquid transported by the activated carbon filter device 30, and transport the treated feed liquid to the ultrafiltration device 50. After the ultrafiltration device 50 further removes particles, colloids, bacteria, heat sources and organic matter in the feed liquid, the obtained ultrafiltration water can meet the liquid inlet demand of the electrodialysis device 60. After the ultrafiltration water is electrodialyzed by the electrodialysis device 60, the obtained acid and alkali can be concentrated or purified according to the requirements of the application scenario and then recycled, thereby reducing the cost of acid and alkali raw materials in the process of generating positive electrode material precursors and improving the economic efficiency of wastewater resource treatment.

[0047] In some embodiments, the wastewater may be pre-treated sulfate wastewater. For example, the sulfate wastewater may be sodium sulfate wastewater after deamination treatment in a deamination tower.

[0048] In some embodiments, the pressure filtration device 10 is a multi-media filter, which is provided with filter media. After the wastewater flows through the filter media, suspended particles and colloids are retained on the surface of the filter media, thereby effectively removing suspended impurities and clarifying the primary filter liquid; for example, in a specific embodiment, the turbidity of the wastewater is less than 20 degrees before entering the pressure filtration device 10, and the turbidity of the primary filter liquid obtained after treatment by the pressure filtration device 10 can reach below 3 degrees.

[0049] In some embodiments, the oil removal resin in the oil removal device 20 is a porous adsorption resin. For example, the oil removal resin can be a styrene-divinylphenyl frame adsorption resin. The porous adsorption resin has a good mesh structure and a high specific surface area, and can selectively adsorb organic molecules in the primary filter liquid through the screening effect of pore size and intermolecular forces or hydrogen bonds. The porous adsorption resin is configured in multiple filter columns connected in series (for example, 3 filter columns connected in series) to remove non-polar substances such as heterocycles, benzene rings, halogenated hydrocarbons, high-carbon alcohols, esters, ethers, ketones, or organic impurities with poor water solubility contained in the primary filter liquid, so that the oil and TOC content in the primary filter liquid reaches a lower level, which is conducive to reducing the subsequent activated carbon oil removal load and ensuring the safe operation of the electrodialysis device 60.

[0050] refer to Figure 2 As shown, considering that the alkaline solution obtained by the electrodialysis device 60 may contain sulfate ions, dissolved particulate matter and suspended matter, in some embodiments, the wastewater resource treatment system also includes a nanofiltration device 70, which is connected to the electrodialysis device 60. The nanofiltration device 70 is used to purify the received alkaline solution to obtain nanofiltration clear liquid and nanofiltration concentrate.

[0051] By purifying the alkali solution through the nanofiltration device 70, sulfate can be further separated from the alkali solution by nanofiltration to obtain a nanofiltration concentrate containing sulfate and a nanofiltration clear liquid with higher purity. The nanofiltration clear liquid can be used as the purified liquid alkali and can be reused in the production of positive electrode material precursors or concentrated for sale.

[0052] It should be understood that the nanofiltration device 70 in the embodiment of the present application can be made of an alkali-resistant material to inhibit corrosion by the alkali solution, and to separate and purify the alkali solution to obtain a nanofiltration concentrate and a nanofiltration clear solution. As an example, when the wastewater resource recovery treatment system in this embodiment treats sodium sulfate wastewater, the nanofiltration device 70 can separate the sodium sulfate from the alkali solution to obtain a sodium sulfate nanofiltration concentrate and a sodium hydroxide nanofiltration clear solution.

[0053] Continue to refer Figure 2 As shown, in order to further reduce the adsorption load of activated carbon, in some embodiments, the oil removal device 20 includes an oil removal filter unit 21, an oil removal resin unit 22 and an oil removal water production tank 23. The discharge port of the oil removal filter unit 21 is connected to the feed port of the oil removal resin unit 22, and the feed port of the oil removal filter unit 21 is connected to the discharge port of the pressure filtration device 10. The above-mentioned oil removal resin is arranged in the oil removal resin unit 22; the feed port of the oil removal water production tank 23 is respectively connected to the discharge ports of the ultrafiltration device 50 and the oil removal resin unit 22, and the discharge port of the oil removal water production tank 23 is connected to the feed port of the activated carbon filtration device 30.

[0054] The primary filter liquid obtained after the filtration treatment of the pressure filtration device 10 passes through the oil removal filter element unit 21 and the oil removal resin unit 22 provided with oil removal resin for multi-stage oil removal, and the obtained oil-removed water is transported to the oil removal water tank 23, and further transported from the oil removal water tank 23 to the activated carbon filtration device 30 for activated carbon filtration. Therefore, the oil removal filter element unit 21 can be designed with an oil removal filter element with high-efficiency oil-water separation function to remove the coarse-grained oil in the primary filter liquid. The obtained liquid is further removed from the oil removal resin of the oil removal resin unit 22 to facilitate the deep oil removal of the primary filter liquid, ensure the oil removal effect, further reduce the adsorption load of the activated carbon in the activated carbon filtration device 30, increase the service life of the activated carbon, reduce the amount of activated carbon hazardous waste generated, and reduce the cost of hazardous waste treatment.

[0055] The oil removal water production tank in this embodiment can receive the oil removal water, providing a buffer space for the subsequent oil removal water to enter the activated carbon filter device 30, so that the liquid inlet of the activated carbon filter device 30 is more controllable. In addition, the feed port of the oil removal water production tank 23 is also connected to the discharge port of the ultrafiltration device 50. The oil removal water production tank 23 can also receive the concentrated liquid containing particles, colloids, bacteria, heat sources and organic impurities discharged from the ultrafiltration device 50. This part of the concentrated liquid can enter the activated carbon filter device 30 again with the oil removal water for filtration and impurity removal, so as to facilitate the subsequent efficient recovery of acid and alkali and the sufficient removal of impurities.

[0056] Since the degreasing resin has a specific adsorption capacity, the adsorption function decays after adsorption saturation. In order to restore the adsorption function of the degreasing resin after adsorption saturation, in some embodiments, the degreasing device 20 also includes a resin regeneration agent supplier 24. The discharge port of the resin regeneration agent supplier 24 is connected to the degreasing resin unit 22, which is used to supply the resin regeneration agent to the degreasing resin unit 22. The resin regeneration agent can precipitate the impurities adsorbed by the degreasing resin to obtain degreasing regeneration liquid, so as to restore the adsorption function of the degreasing resin, avoid frequent replacement of the degreasing resin, and further improve the economy of the system.

[0057] refer to Figure 2 As shown, in some embodiments, the nanofiltration device 70 includes a dilute alkali box 71, a preservation fine filter 72, and a nanofiltration membrane assembly 73 that are connected in sequence; the feed port of the dilute alkali box 71 is connected to the electrodialysis device 60, and is used to receive the alkali solution obtained by the electrodialysis device 60, the preservation fine filter 72 is used to treat the alkali solution to obtain a fine filtrate alkali, and the nanofiltration membrane assembly 73 is used to perform nanofiltration treatment on the fine filtrate alkali to obtain a nanofiltration clear liquid and a nanofiltration concentrate.

[0058] The dilute alkali tank 71 can receive the alkali solution supplied by the electrodialysis device 60. The alkali solution is transported to the preservation fine filter 72 through the dilute alkali tank 71. The preservation fine filter 72 can remove soluble particles and suspended matter that may exist in the alkali solution to obtain a fine filtrate alkali with higher purity, so as to reduce the nanofiltration load of the subsequent nanofiltration membrane component 73 and increase the service life of the nanofiltration membrane. The fine filtrate alkali is further transported to the nanofiltration membrane component 73 for nanofiltration treatment, thereby obtaining sulfate concentrate (i.e., nanofiltration concentrate) and purified liquid alkali (i.e., nanofiltration clear liquid). In this way, sulfate ions and other impurities can be fully removed, and the obtained nanofiltration clear liquid can be directly reused in the production of positive electrode material precursors or concentrated and sold outside.

[0059] In the embodiment of the present application, a plurality of nanofiltration membrane units may be designed in the nanofiltration membrane assembly 73 to achieve multi-stage nanofiltration of the alkali solution, so as to obtain nanofiltration clear liquids of different purities according to different alkali purity requirements.

[0060] In a specific embodiment, referring to Figure 3 As shown, in the nanofiltration device 70, the nanofiltration membrane assembly 73 includes a first-level nanofiltration membrane unit 731, the feed port of the first-level nanofiltration membrane unit 731 is connected to the discharge port of the preservation fine filter 72, the feed port of the dilute alkali box 71 is connected to the discharge port of the electrodialysis device 60, and the discharge port of the dilute alkali box 71 is connected to the feed port of the preservation fine filter 72, the alkali solution transported by the electrodialysis device 60 passes through the dilute alkali box 71, and then enters the preservation fine filter 72 for fine filtration treatment to obtain fine filtrate alkali, and the fine filtrate alkali then enters the first-level nanofiltration membrane unit 731 for first-level nanofiltration to obtain nanofiltration concentrate and nanofiltration clear liquid, and the nanofiltration clear liquid can be recycled or concentrated and sold.

[0061] In another specific embodiment, referring to Figure 4 As shown, in the nanofiltration device 70, the nanofiltration membrane assembly 73 includes a first-level nanofiltration membrane unit 731 and a second-level nanofiltration membrane unit 733; the first-level nanofiltration membrane unit 731 is connected to the preservation fine filter 72, and is used to perform nanofiltration treatment on the fine filtrate alkali to obtain a first-level nanofiltration concentrate and a dialysate; the second-level nanofiltration membrane unit 733 is used to perform nanofiltration treatment on the dialysate to obtain a second-level nanofiltration concentrate and a clear liquid; the feed port of the dilute alkali box 71 is connected to the second-level nanofiltration membrane unit 733, and is also used to receive the second-level nanofiltration concentrate.

[0062] Compared with the primary nanofiltration, in this embodiment, the nanofiltration membrane assembly 73 uses the primary nanofiltration membrane unit 731 and the secondary nanofiltration membrane unit 733 to sequentially perform nanofiltration on the filtrate alkali transported by the preservation fine filter 72, thereby realizing two-stage nanofiltration after liquid alkali fine filtration treatment. The alkali liquid enters the preservation fine filter 72 after passing through the dilute alkali tank 71. The filtrate alkali obtained after fine filtration treatment by the preservation fine filter 72 enters the primary nanofiltration membrane unit 731 for primary nanofiltration to obtain a primary nanofiltration concentrate containing sulfate ions and a dialysate containing a large amount of hydroxide ions. The dialysate is further transported to the secondary nanofiltration membrane unit 733 for secondary nanofiltration, thereby promoting the further removal of sulfate ions in the dialysate, and obtaining a higher-purity secondary nanofiltration clear solution and a secondary nanofiltration concentrate containing less sulfate ions. The secondary nanofiltration clear solution can be recycled or concentrated and sold.

[0063] Since the feed port of the dilute alkali tank 71 is connected to the secondary nanofiltration membrane unit 733, the secondary nanofiltration concentrate can be circulated back into the dilute alkali tank 71, and is deeply filtered again through the preservation fine filter 72, the primary nanofiltration membrane unit 731 and the secondary nanofiltration membrane unit 733 in sequence with the alkali liquid, so as to improve the resource utilization rate, realize the full recovery of materials, and reduce the processing cost of the nanofiltration concentrate.

[0064] In order to improve the system stability in the multi-stage nanofiltration process, refer to Figure 4 As shown, the nanofiltration device 70 also includes a primary dialysate tank 732 and a secondary dialysate tank 734. The liquid inlet of the primary dialysate tank 732 is connected to the discharge port of the primary nanofiltration membrane unit 731, and the liquid outlet of the primary dialysate tank 732 is connected to the feed port of the secondary nanofiltration membrane unit 733 to receive the dialysate delivered by the primary nanofiltration membrane unit 731 and deliver the dialysate to the secondary nanofiltration membrane unit 733 for secondary nanofiltration. The feed port of the secondary dialysate tank 734 is connected to the discharge port of the secondary nanofiltration membrane unit 733 to receive the secondary nanofiltration clear liquid delivered by the secondary nanofiltration membrane unit 733, so as to utilize the subsequent recycling or concentrated sale of the secondary nanofiltration clear liquid. The design of the primary dialysate tank 732 and the secondary dialysate tank 734 can provide a buffer space for the delivery of the dialysate and the secondary nanofiltration clear liquid, avoid excessive changes in the system flow, and thereby effectively improve the stability of the system.

[0065] In some embodiments, in order to achieve deep resource recovery of wastewater, reference Figure 2 The sodium sulfate wastewater resource treatment system also includes a reverse osmosis device 80, which is connected to the electrodialysis device 60 and the nanofiltration device 70. The reverse osmosis device 80 is used to perform multi-stage reverse osmosis filtration on the dilute brine and nanofiltration concentrate to obtain reverse osmosis regenerated liquid and pure water.

[0066] It can be understood that the reverse osmosis device 80 is connected to the electrodialysis device 60 and the nanofiltration device 70 respectively to receive the dilute brine transported by the electrodialysis device 60 and the nanofiltration concentrate transported by the nanofiltration device 70. The nanofiltration concentrate contains a large amount of alkali, which enters the reverse osmosis device 80 together with the dilute brine to adjust the pH of the dilute brine. After the dilute brine and the nanofiltration concentrate pass through the reverse osmosis membrane in the reverse osmosis device 80, the salt, most bacteria, colloids and large molecular weight organic matter in the dilute brine and the nanofiltration concentrate are separated and enter the reverse osmosis regeneration liquid, thereby obtaining pure water for recycling, thereby further improving the economy of the system.

[0067] In some embodiments, the activated carbon filtration device 30 includes an activated carbon filter 31 and an activated carbon water production tank 32; the feed port of the activated carbon filter 31 is connected to the discharge port of the oil removal water production tank 23, and the discharge port of the activated carbon filter 31 is connected to the feed port of the activated carbon water production tank 32; the discharge port of the activated carbon water production tank 32 is connected to the feed port of the weight removal filtration device 40, and the feed port of the activated carbon water production tank 32 is also connected to the discharge port of the reverse osmosis device 80.

[0068] Since the primary filter liquid passes through the multi-stage oil removal of the oil removal filter unit 21 and the oil removal resin unit 22 in the oil removal device 20, the oil content of the obtained oil-removed water has been largely removed, the feed port of the activated carbon filter 31 is connected to the discharge port of the oil-removed water tank 23, and the activated carbon is arranged in the activated carbon filter. The activated carbon filter 31 receives the oil-removed water transported by the oil-removed water tank 23 and performs activated carbon filtration, thereby reducing the adsorption load of the activated carbon, thereby increasing the service life of the activated carbon and avoiding the large-scale generation of activated carbon waste. After the oil-removed product is filtered by the activated carbon filter 31, the organic matter, colloidal silicon, residual chlorine, heavy metal ions, etc. contained in it are further adsorbed and removed. In addition, it is beneficial to ensure the liquid inlet demand of the subsequent electrodialysis device 60; the discharge port of the activated carbon water production tank 32 is connected to the feed port of the weight removal filter device 40, and the activated carbon water production tank 32 receives the activated carbon water produced by the activated carbon filter 31, providing a buffer space for the activated carbon water production, so that the flow and pressure of the activated carbon water when entering the weight removal filter device 40 are more controllable, so as to improve the stability of the system; the feed port of the activated carbon water production tank 32 is also connected to the discharge port of the reverse osmosis device 80 to receive the reverse osmosis regeneration liquid discharged from the reverse osmosis device 80, so that the reverse osmosis regeneration liquid can be further circulated and filtered with the activated carbon water production, so as to further improve the economy of the system.

[0069] In some embodiments, the weight removal filtration device 40 includes a resin weight removal filter 41, a resin regeneration liquid supplier 42 and a weight removal water production tank 43. Chelating resin is provided in the resin weight removal filter 41. The feed port of the resin weight removal filter 41 is connected to the discharge port of the activated carbon water production tank 32. The discharge port of the resin weight removal filter 41 is connected to the feed port of the weight removal water production tank 43 to remove heavy metal ions in the activated carbon water production to obtain weight removal water and weight removal regeneration liquid; the discharge port of the weight removal water production tank 43 is connected to the feed port of the ultrafiltration device 50; the discharge port of the resin regeneration liquid supplier 42 is connected to the resin weight removal filter 41 to supply resin regeneration liquid to the resin weight removal filter 41.

[0070] It should be noted that a chelating resin is provided in the resin de-weighting filter 41 in the embodiment of the present application. The chelating resin is a functional polymer material that can react with metal ions through the atoms on the functional groups of the chelating resin to form coordinated covalent bonds, selectively chelate specific metal ions, and generate chelates with stable structures, thereby achieving the removal of heavy metal ions in the oil-removed water, so as to meet the liquid inlet requirements of the subsequent electrodialysis device 60.

[0071] The resin weight removal filter 41 in this embodiment can be designed with multiple interconnected chelating resin filter columns to achieve multi-stage resin weight removal treatment of activated carbon water production. For example, the resin weight removal filter 41 is designed with filter columns connected in series and respectively configured with chelating resins to achieve three-stage resin weight removal treatment of activated carbon water production to ensure that heavy metal ions are fully removed.

[0072] The activated carbon water is transported from the activated carbon water tank 32 to the resin de-weighting filter 41 for heavy metal ion removal. Since the adsorption performance of the chelate resin will decay after saturation, the resin regeneration liquid supplier 42 can provide resin regeneration liquid to the resin de-weighting filter 41 to precipitate the heavy metal ions on the chelate resin to form de-weighting regeneration liquid, thereby restoring the heavy metal ion adsorption function of the chelate resin. After the activated carbon is de-weighted by the resin de-weighting filter 41, de-weighting water and de-weighting regeneration liquid containing heavy metal ions are obtained. The de-weighting water is further transported to the de-weighting water tank 43. The discharge port of the de-weighting water tank 43 is connected to the feed port of the ultrafiltration device 50 to transport the received de-weighting water to the ultrafiltration device 50 for ultrafiltration and impurity removal. The de-weighting water tank 43 can provide a buffer space for the subsequent transportation of the de-weighting water to improve the stability of the system.

[0073] In the embodiment of the present application, the primary filter liquid obtained by the pressure filtration device 10 is first subjected to oil removal treatment and activated carbon filtration treatment and then to weight removal treatment, which can reduce the interference of oil on weight removal, avoid the extraction agent (such as P204, P507, etc.) and its diluent (such as sulfonated kerosene) that may be contained in the wastewater from being wrapped or adsorbed by grease, thereby inhibiting the removal efficiency of heavy metal ions during the weight removal operation, and at the same time, it is also beneficial to avoid a large amount of oil from contaminating the resin weight removal filter 41, thereby improving the treatment effect and service life of the weight removal filter device 40.

[0074] Continue to refer Figure 2 As shown, in some embodiments, the ultrafiltration device 50 includes an ultrafiltration membrane assembly 51 and an ultrafiltration water production tank 52; the feed port of the ultrafiltration membrane assembly 51 is connected to the discharge port of the de-weighting water production tank 43, and the discharge port of the ultrafiltration membrane assembly 51 is respectively connected to the feed ports of the ultrafiltration water production tank 52 and the oil removal water production tank 23, so as to ultrafilter the de-weighting water production to obtain an ultrafiltration concentrate and ultrafiltration water production, and transport the ultrafiltration concentrate to the oil removal water production tank 23 and transport the ultrafiltration water production to the ultrafiltration water production tank 52; the discharge port of the ultrafiltration water production tank 52 is connected to the feed port of the electrodialysis device 60, so as to transport the ultrafiltration water production to the electrodialysis device 60 for electrodialysis treatment.

[0075] It can be understood that the ultrafiltration membrane assembly 51 in the ultrafiltration device 50 can adopt a pressurized membrane separation technology, that is, under a certain pressure, small molecular solutes and solvents are allowed to pass through the ultrafiltration membrane with micropores (the micropores of the ultrafiltration membrane can reach below 0.01 microns, which can effectively remove particles, colloids, bacteria, heat sources and organic matter in the water), while large molecular solutes cannot pass through and remain on one side of the ultrafiltration membrane. During the ultrafiltration treatment process of the ultrafiltration membrane assembly 51, the solvent and various small solutes contained in the oil-removing water pass through the ultrafiltration membrane from the high-pressure side to the low-pressure side, thereby obtaining ultrafiltration water, and solute molecules larger than the pore size of the ultrafiltration membrane are retained by the membrane to form an ultrafiltration concentrate.

[0076] Since the discharge port of the ultrafiltration membrane assembly 51 is also connected to the feed port of the oil removal water production tank 23, the ultrafiltration concentrate can be circulated back into the oil removal water production tank 23 and filtered again with the oil removal water production to improve the economy of the system; the design of the ultrafiltration water production tank 52 can provide a buffer space for the transportation of ultrafiltration water production, so that the flow rate and pressure of the ultrafiltration water production entering the electrodialysis device 60 are more controllable to ensure the stability of the system operation.

[0077] In some embodiments, the sodium sulfate wastewater resource treatment system also includes a pure water tank 90, one feed port of the pure water tank 90 is connected to the discharge port of the reverse osmosis device 80 to receive and collect the pure water delivered by the reverse osmosis device 80; the discharge port of the pure water tank 90 is connected to the feed port of the electrodialysis device 60, and the pure water tank 90 can be used to receive pure water supplied from the outside to be delivered to the electrodialysis device 60 to provide reaction raw materials for electrodialysis of ultrafiltration water production.

[0078] In some embodiments, the electrodialysis device 60 includes an acid chamber, an alkali chamber and a salt chamber. The discharge port of the pure water tank 90 is connected to the feed ports of the acid chamber and the alkali chamber, respectively, to supply pure water to the acid chamber and the alkali chamber, respectively. The feed port of the salt chamber is connected to the discharge port of the ultrafiltration device 50, so that the ultrafiltration water can enter the salt chamber for electrodialysis treatment, so that acid solution is produced from the discharge port of the acid chamber, dilute brine is produced from the discharge port of the salt chamber, and alkali solution is produced from the discharge port of the alkali chamber, thereby realizing acid and alkali production from wastewater.

[0079] In a specific embodiment, the electrodialysis device 60 can be a bipolar membrane electrodialysis device 60. The bipolar membrane in the bipolar membrane electrodialysis device 60 serves as an ion exchange composite membrane, which is composed of a cation exchange layer (N-type membrane), an interface hydrophilic layer (catalytic layer) and an anion exchange layer (P-type membrane). Under the action of a DC electric field, water can be dissociated to obtain hydrogen ions and hydroxide ions on both sides of the membrane respectively. By combining the bipolar membrane with the anion exchange membrane and the cation exchange membrane to form a bipolar membrane electrodialysis device 60, sulfate in the ultrafiltration water can be converted into corresponding acid and alkali solutions without introducing new components.

[0080] More specifically, the bipolar membrane electrodialysis device 60 includes an anode and a cathode arranged at intervals, two bipolar membranes arranged at intervals between the anode and the cathode, and an anion exchange membrane and a cation exchange membrane arranged at intervals between the two bipolar membranes. The cation exchange membrane is located on the side of the anion exchange membrane facing the cathode, the interval area between the anion exchange membrane and the cation exchange membrane forms a salt chamber, the interval area between the anion exchange membrane and the bipolar membrane close to the anode side forms an acid chamber, and the interval area between the cation exchange membrane and the bipolar membrane close to the cathode side forms an alkali chamber. Taking the treatment of sodium sulfate wastewater system as an example, ultrafiltration produces sodium sulfate that enters the salt chamber. Under the action of the DC electric field, sulfate ions pass through the anion exchange membrane into the acid chamber, and sodium ions pass through the cation exchange membrane into the reduction chamber. Water is electrolyzed in the acid chamber and the alkali chamber to generate hydrogen ions and hydroxide ions respectively. Hydrogen ions combine with sulfate ions in the acid chamber to generate sulfuric acid and are discharged through the discharge port of the acid chamber. Hydroxide ions combine with sodium ions in the alkali chamber to generate sodium hydroxide and are discharged through the discharge port of the alkali chamber. The sodium sulfate concentration of the ultrafiltration water in the salt chamber is reduced to obtain dilute brine, which is discharged from the salt chamber discharge port, and then acid solution, alkali solution and dilute brine are obtained respectively, realizing acid and alkali production from wastewater.

[0081] In some embodiments, the discharge port of the acid chamber is used to connect to an acid evaporator so that the acid liquid can be evaporated and concentrated by the acid evaporator and then reused in the process of generating the positive electrode material precursor; the discharge port of the alkali chamber is connected to the nanofiltration device 70 or the alkali evaporator to perform nanofiltration purification or evaporate and concentrate the alkali liquid and then reused in the process of generating the positive electrode material precursor, further improving the economy of the system.

[0082] In some embodiments, the reverse osmosis device 80 includes a dilute brine tank 81, a first-stage reverse osmosis filter 82, a first-stage reverse osmosis water production tank 83, a second-stage reverse osmosis filter 84, a second-stage reverse osmosis water production tank 85 and a third-stage reverse osmosis filter 86, which are connected in sequence. The feed port of the dilute brine tank 81 is connected to the discharge port of the salt chamber and the nanofiltration device 70, respectively, to receive the dilute brine transported by the salt chamber and the nanofiltration concentrate transported by the nanofiltration device 70. The discharge port of the first-stage reverse osmosis filter 82 is connected to the activated carbon water production tank 32, so that the first-stage reverse osmosis concentrated phase obtained after the first-stage reverse osmosis filtration treatment of the dilute brine and the nanofiltration concentrate is discharged into the activated carbon water production tank 32 for circulation filtration. The discharge port of the second-stage reverse osmosis filter 84 is also connected to the dilute brine tank 81, so that the second-stage reverse osmosis concentrated phase obtained after the first-stage reverse osmosis filtration treatment is discharged into the dilute brine tank 81 for circulation filtration, so as to further improve the economy of the system.

[0083] The discharge port of the three-stage reverse osmosis filter 86 is connected to an inlet of the pure water tank 90, so that the dilute brine and nanofiltration concentrate can be filtered through the three-stage reverse osmosis to produce pure water. The pure water is collected in the pure water tank 90 and can be reused in the electrodialysis device 60 to participate in the electrodialysis reaction, so as to reduce the introduction of external pure water and further improve the economy of the system.

[0084] In some embodiments, taking into account the recovery of impurities produced by each device, the wastewater resource treatment system also includes a wastewater collection box 100, and the feed port of the wastewater collection box is respectively connected to the pressure filter device 10, the oil removal device 20, the activated carbon filter device 30 and the weight removal filter device 40, so that the suspended matter and other impurities generated during the filtration operation of the pressure filter device 10, the oil removal regeneration liquid generated during the filtration operation of the oil removal device 20, the backwash water generated during the filtration operation of the activated carbon filter device 30 and the weight removal regeneration liquid generated during the filtration operation of the weight removal filter device 40 can be collected to avoid pollution and promote environmental protection.

[0085] In some embodiments, the wastewater resource treatment system also includes a positive electrode material precursor production equipment 1000, which is used for the production and preparation of positive electrode material precursors. The positive electrode material precursor production equipment 1000 is connected to the pressure filtration device 10 to transport the wastewater into the pressure filtration device 10; the positive electrode material precursor production equipment 1000 is also respectively connected to the electrodialysis device 60 and the nanofiltration device 70 to receive and reuse the acid solution and the nanofiltration clear liquid, thereby realizing the integration of wastewater resource utilization and positive electrode material precursor production, thereby significantly improving the economic efficiency of the system.

[0086] In summary, the wastewater resource treatment system provided in the embodiment of the present application uses wastewater to produce acid solution and alkali solution, which effectively alleviates the problems of high acid and alkali costs and supply shortages in the production process of positive electrode materials, improves the economy of wastewater treatment, especially sulfate wastewater treatment, reduces the use of activated carbon, and avoids the large-scale generation of carbon hazardous waste.

[0087] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Those skilled in the art can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A wastewater resource treatment system, characterized in that: It comprises a pressure filtration device (10), an oil removal device (20), an activated carbon filtration device (30), a weight removal filtration device (40), an ultrafiltration device (50), and an electrodialysis device (60) which are sequentially connected and communicated; The pressure filtration device (10) is used to remove suspended impurities in the wastewater and obtain a primary filtration liquid, and the primary filtration liquid is sent to the oil removal device (20) under the action of the internal pressure; The oil removal device (20) is provided with an oil removal resin for removing the oil in the primary filter liquid to obtain oil-removed water; The activated carbon filter device (30), the weight removal filter device (40), and the ultrafiltration device (50) are used in sequence to filter the oil-removed product water to obtain ultrafiltration product water; The electrodialysis device (60) is used to perform electrodialysis treatment on the ultrafiltration water to obtain acid solution, alkali solution and dilute brine respectively.

2. The wastewater resource treatment system according to claim 1, characterized in that: The device further comprises a nanofiltration device (70), the nanofiltration device (70) being in communication with the electrodialysis device (60), and the nanofiltration device (70) being used to purify the received alkali solution to obtain a nanofiltration clear solution and a nanofiltration concentrated solution.

3. The wastewater resource treatment system according to claim 2, characterized in that: The oil removal device (20) includes an oil removal filter unit (21), an oil removal resin unit (22), and an oil removal water production tank (23); The discharge port of the oil removal filter element unit (21) is connected to the feed port of the oil removal resin unit (22), and the feed port of the oil removal filter element unit (21) is connected to the discharge port of the pressure filtering device (10), and the oil removal resin unit (22) is provided with the oil removal resin; The feed port of the oil removal water production tank (23) is connected to the discharge ports of the ultrafiltration device (50) and the oil removal resin unit (22), respectively, and the discharge port of the oil removal water production tank (23) is connected to the feed port of the activated carbon filtration device (30).

4. The wastewater resource treatment system according to claim 3, characterized in that: The oil removal device (20) further includes a resin regeneration agent supplier (24); a discharge port of the resin regeneration agent supplier (24) is connected to the oil removal resin unit (22) and is used to supply the resin regeneration agent to the oil removal resin unit (22).

5. The wastewater resource treatment system according to claim 2, characterized in that: The nanofiltration device (70) comprises a diluted alkali tank (71), a preservation fine filter (72), and a nanofiltration membrane assembly (73) which are connected in sequence; The feed port of the dilute alkali box (71) is connected to the electrodialysis device (60) and is used to receive the alkali solution obtained by the electrodialysis device (60). The preservation fine filter (72) is used to treat the alkali solution to obtain fine filtrate alkali. The nanofiltration membrane assembly (73) is used to perform nanofiltration treatment on the fine filtrate alkali to obtain nanofiltration clear liquid and nanofiltration concentrate.

6. The wastewater resource treatment system according to claim 3, characterized in that: The invention also includes a reverse osmosis device (80), which is connected to the electrodialysis device (60) and the nanofiltration device (70). The reverse osmosis device (80) is used to perform multi-stage reverse osmosis filtration on the dilute brine and the nanofiltration concentrate to obtain reverse osmosis regenerated liquid and pure water.

7. The wastewater resource treatment system according to claim 6, characterized in that: The activated carbon filtration device (30) comprises an activated carbon filter (31) and an activated carbon water production tank (32); The feed port of the activated carbon filter (31) is connected to the discharge port of the oil removal water production tank (23), and the discharge port of the activated carbon filter (31) is connected to the feed port of the activated carbon water production tank (32); The discharge port of the activated carbon water production tank (32) is connected to the feed port of the weight removal filter device (40), and the feed port of the activated carbon water production tank (32) is also connected to the discharge port of the reverse osmosis device (80).

8. The wastewater resource treatment system according to claim 6, characterized in that: The pressure filtration device (10) is a multi-media filter, wherein filter material is provided in the multi-media filter for reducing the turbidity of the wastewater.

9. The wastewater resource treatment system according to claim 7, characterized in that: The de-weighting filtering device (40) includes a resin de-weighting filter (41), a resin regeneration liquid supplier (42), and a de-weighting production water tank (43); The resin de-weighting filter (41) is provided with a chelating resin, the feed port of the resin de-weighting filter (41) is connected to the discharge port of the activated carbon water production tank (32), and the discharge port of the resin de-weighting filter (41) is connected to the feed port of the de-weighting water production tank (43), so as to remove heavy metal ions in the activated carbon water production to obtain de-weighting water and de-weighting regeneration liquid; The discharge port of the de-weighted water tank (43) is connected to the feed port of the ultrafiltration device (50); The discharge port of the resin regeneration liquid supplier (42) is connected to the resin weight removal filter (41) and is used to supply the resin regeneration liquid to the resin weight removal filter (41).

10. The wastewater resource treatment system according to claim 7, characterized in that: It also includes a pure water tank (90), and the electrodialysis device (60) includes an acid chamber, an alkali chamber, and a salt chamber; The feed port of the pure water tank (90) is connected to the discharge port of the reverse osmosis device (80), and the discharge port of the pure water tank (90) is communicated with the feed ports of the acid chamber and the alkali chamber respectively; The feed port of the salt chamber is connected to the discharge port of the ultrafiltration device (50), the discharge port of the acid chamber is used to connect to the acid evaporator, and the discharge port of the alkali chamber is used to connect to the nanofiltration device (70) or the alkali evaporator; The reverse osmosis device (80) includes a dilute brine tank (81), a first-stage reverse osmosis filter (82), a first-stage reverse osmosis water production tank (83), a second-stage reverse osmosis filter (84), a second-stage reverse osmosis water production tank (85) and a third-stage reverse osmosis filter (86) which are connected in sequence. The feed port of the dilute brine tank (81) is connected to the salt chamber and the discharge port of the nanofiltration device (70), respectively. The discharge port of the first-stage reverse osmosis filter (82) is connected to the activated carbon water production tank (32). The discharge port of the second-stage reverse osmosis filter (84) is also connected to the dilute brine tank (81).

11. The wastewater resource treatment system according to any one of claims 6 to 10, characterized in that: It also includes a positive electrode material precursor production device (1000), which is connected to the pressure filtering device (10) to transport wastewater into the pressure filtering device (10); The positive electrode material precursor production equipment (1000) is also connected to the electrodialysis device (60) and the nanofiltration device (70) respectively to receive and reuse the acid solution and the nanofiltration clear solution.

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