Low-energy consumption high-salt wastewater fractional salt crystallization device

Abstract

The embodiment of the application provides a low-energy-consumption high-salinity wastewater salt separation crystallization device. The pretreatment mechanism is arranged in the treatment box and comprises: a stirring unit fixed to the top of the treatment box and extending into the inner cavity thereof; a detachable filter plate vertically arranged in the inner cavity of the treatment box, which divides the inner cavity of the treatment box into a sedimentation cavity and a filtration cavity; a filtration assembly comprising: a pump body arranged at the top of the treatment box, with the input end thereof communicated with the filtration cavity through a first connecting pipe; a filter cartridge fixed to the outer wall of the treatment box, with the water inlet thereof communicated with the output end of the pump body through a second connecting pipe; an ultrafiltration membrane assembly detachably arranged in the filter cartridge; wherein the bottom of the side wall of the filter cartridge is provided with a clean water outlet, and the middle part of the side wall is provided with a blowdown pipe; and an evaporation crystallizer communicated with the clean water outlet of the filtration assembly through a conveying pipeline. The application realizes multi-stage efficient treatment of high-salinity wastewater, effectively improves the wastewater purification effect and salt separation crystallization efficiency, and facilitates the disassembly and maintenance of the filter plate and the efficient cleaning of the sediment.

Description

Technical Field

[0001] This application relates to the field of coal chemical equipment technology, and specifically to a low-energy-consumption, high-salt wastewater desalination crystallization device. Background Technology

[0002] With the booming development of the coal chemical industry, a large amount of high-salinity wastewater is continuously generated during its production process. This wastewater has an extremely complex composition, containing not only common salts such as sodium chloride and sodium sulfate, but also various trace metal salts and organic pollutants. If discharged directly without proper treatment, it will cause severe salinization of the surrounding soil, damaging soil structure, reducing fertility, and affecting the normal growth of crops. When discharged into water bodies, it will alter the chemical properties of the water, destroy the habitat of aquatic organisms, and trigger a series of ecological and environmental problems. At the same time, the direct discharge of large amounts of recyclable salts from the wastewater also results in a significant waste of resources. In the salt separation and crystallization process, wastewater pretreatment is a crucial initial step.

[0003] However, during wastewater pretreatment, uneven mixing of the coagulant and wastewater leads to incomplete flocculation, making it difficult for a large amount of suspended solids and colloids to settle. These impurities, upon entering the subsequent evaporation and crystallization process, will form scale on the surface of the evaporation equipment, reducing its heat transfer efficiency, increasing energy consumption, frequently causing equipment malfunctions, and shortening its lifespan. Utility Model Content

[0004] This application provides a low-energy-consumption, high-salt wastewater desalination crystallization device, which solves the problems mentioned in the background art.

[0005] This application provides a low-energy-consumption, high-salt wastewater desalination and crystallization device, comprising:

[0006] The treatment tank is used to receive and pretreat high-salinity wastewater.

[0007] A pretreatment mechanism, located inside the treatment tank, includes: a stirring unit fixed to the top of the treatment tank and extending into its inner cavity, used to fully mix high-salt wastewater with coagulant to promote flocculation reaction; a detachable filter plate, vertically arranged inside the treatment tank, dividing the inner cavity into a sedimentation chamber and a filtration chamber, used to intercept large suspended particles generated by the flocculation reaction, so that the high-salt wastewater entering the filtration chamber is initially purified; wherein, the side wall of the sedimentation chamber of the treatment tank is provided with an outlet, the outlet is provided with a cleaning pipe, and the cleaning pipe is provided with a valve;

[0008] The filtration assembly includes: a pump body disposed on the top of the treatment tank, the input end of which is connected to the filtration chamber via a first connecting pipe; a filter cartridge fixed to the outer wall of the treatment tank, the inlet of which is connected to the output end of the pump body via a second connecting pipe; and an ultrafiltration membrane assembly detachably disposed inside the filter cartridge for fine filtration of the pre-purified high-salt wastewater; wherein, a clean water outlet is provided at the bottom of the side wall of the filter cartridge, and a drain pipe is provided in the middle of the side wall for cleaning impurities on the ultrafiltration membrane assembly;

[0009] The evaporator crystallizer is connected to the purified water outlet of the filter assembly via a delivery pipeline and is used to perform salt separation and crystallization on the finely filtered high-salt wastewater.

[0010] In one possible implementation, the pretreatment mechanism further includes a scraping assembly; the scraping assembly includes a second motor, a rotating rod, a first gear, a second gear, a threaded rod, a spiral discharge shaft, and a scraper; the second motor is mounted on the side wall of the treatment chamber; one end of the rotating rod is connected to the output end of the second motor, and the other end extends to the sedimentation chamber of the treatment chamber; one end of the spiral discharge shaft is connected to the end of the rotating rod away from the second motor, and the other end is connected to the outlet of the treatment chamber for discharging sediment at the bottom of the sedimentation chamber; the first gear is fixedly connected to the outer wall of the rotating rod and located outside the treatment chamber, and the second gear meshes with the first gear; the threaded rod is fixedly connected to the second gear and extends to the sedimentation chamber; the scraper is threadedly connected to the threaded rod via a threaded sleeve for cleaning the surface of the removable filter plate.

[0011] In one possible implementation, the top of the removable filter plate is provided with a groove, and the top of the scraper is provided with a slider that slides in cooperation with the groove.

[0012] In one possible implementation, the low-energy-consumption high-salt wastewater desalination crystallization device further includes a housing; the first gear and the second gear are both disposed inside the housing; the second motor is mounted on the outer wall of the housing, and its output end extends into the inner cavity of the housing.

[0013] In one possible implementation, the low-energy-consumption, high-salt wastewater desalination crystallization device further includes a membrane self-cleaning mechanism; the membrane self-cleaning mechanism includes a third motor, a connecting shaft, and a cleaning plate; the third motor is installed at the bottom of the filter cartridge, and its output end extends into the filter cartridge and is connected to the connecting shaft; the cleaning plate is fixedly connected to the outer wall of the connecting shaft and contacts the surface of the ultrafiltration membrane assembly.

[0014] In one possible implementation, the ultrafiltration membrane assembly includes a first filter membrane and a second filter membrane; both the first filter membrane and the second filter membrane are fixedly disposed inside the filter cartridge and are spaced apart along the height direction of the filter cartridge; the first filter membrane is located above the second filter membrane, and the pore size of the first filter membrane is larger than that of the second filter membrane; two cleaning plates are provided; the two cleaning plates are respectively in contact with the surfaces of the first filter membrane and the second filter membrane.

[0015] In one possible implementation, the stirring unit includes a first motor, a stirrer, and a mounting plate; the mounting plate is fixed to the top of the processing tank; the first motor is mounted on the top of the processing tank; and the stirrer is connected to the output end of the first motor and extends to the sedimentation chamber.

[0016] In one possible implementation, the low-energy-consumption, high-salt wastewater desalination crystallization device further includes a fixing frame; the fixing frame is installed on the side wall of the treatment tank; and the filter cartridge is installed on the fixing frame.

[0017] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or:

[0018] The low-energy-consumption high-salt wastewater desalination crystallization device provided in this application embodiment uses a stirring unit in the pretreatment mechanism inside the treatment tank to fully mix the high-salt wastewater with the coagulant and promote flocculation reaction. A detachable filter plate intercepts large suspended particles to achieve preliminary purification. In the filtration assembly, the pump body, in conjunction with the filter cartridge and the detachable ultrafiltration membrane assembly, further refines the pre-purified high-salt wastewater. Finally, the evaporator crystallizer performs desalination crystallization on the finely filtered high-salt wastewater. The entire device achieves multi-stage and efficient treatment of high-salt wastewater, effectively improving the wastewater purification effect and desalination crystallization efficiency. At the same time, it facilitates equipment maintenance and impurity removal, and reduces energy consumption and operating costs. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of the low-energy-consumption, high-salt wastewater desalination crystallization device provided in the embodiments of this application (view 1);

[0021] Figure 2 View 2: Structural schematic diagram of the low-energy-consumption, high-salt wastewater desalination crystallization device provided in the embodiments of this application;

[0022] Figure 3 This is a schematic diagram of the structure of the filter cartridge provided in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the third motor and its connection structure provided in the embodiments of this application;

[0024] Figure 5 A cross-sectional view of the processing box provided in an embodiment of this application;

[0025] Figure 6 for Figure 5 Enlarged view of point A in the image.

[0026] Icons: 1-Processing box; 2-Pretreatment mechanism; 201-Mounting plate; 202-First motor; 203-Agitator; 204-Removable filter plate; 205-Housing; 206-Second motor; 207-Rotor; 208-Screw discharge shaft; 209-First gear; 210-Second gear; 211-Threaded rod; 212-Scraper; 3-Filter assembly; 301-Pump body; 302-First connecting pipe; 303-Second connecting pipe; 304-Filter cartridge; 305-Ultrafiltration membrane assembly; 4-Base plate; 5-Evaporator crystallizer; 6-Third motor; 7-Connecting shaft; 8-Cleaning plate; 9-Fixing frame; 10-Drain pipe; 11-Clean water outlet; 12-Slider; 13-Cleaning pipe. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0029] This application provides a low-energy-consumption, high-salt wastewater desalination crystallization device, such as... Figures 1 to 6 As shown, the low-energy-consumption, high-salt wastewater desalination crystallization device includes:

[0030] Treatment tank 1 is used to receive and pre-treat high-salinity wastewater.

[0031] The pretreatment unit 2, located inside the treatment tank 1, includes: a stirring unit fixed to the top of the treatment tank 1 and extending into its inner cavity, used to thoroughly mix the high-salt wastewater with the coagulant to promote flocculation. A detachable filter plate 204, vertically installed inside the treatment tank 1, divides the inner cavity into a sedimentation chamber and a filtration chamber, used to intercept large suspended particles generated by the flocculation reaction, thus providing preliminary purification of the high-salt wastewater entering the filtration chamber. The sedimentation chamber of the treatment tank 1 has an outlet on its side wall, with a cleaning pipe 13 equipped with a valve. Specifically, the detachable filter plate 204 has a pore size of 0.5-1 mm and a thickness of 5-8 mm, possessing sufficient strength to withstand the pressure of the high-salt wastewater.

[0032] The filter assembly 3 includes: a pump body 301, disposed on the top of the treatment tank 1, with its input end connected to the filter chamber via a first connecting pipe 302; a filter cartridge 304, fixed to the outer wall of the treatment tank 1, with its inlet connected to the output end of the pump body 301 via a second connecting pipe 303; and an ultrafiltration membrane assembly 305, detachably disposed within the filter cartridge 304, used for fine filtration of the pre-purified high-salt wastewater. The bottom of the side wall of the filter cartridge 304 is provided with a clean water outlet 11, and a drain pipe 10 is provided in the middle of its side wall for cleaning impurities from the ultrafiltration membrane assembly 305.

[0033] The evaporator crystallizer 5 is connected to the purified water outlet 11 of the filter assembly 3 via a conveying pipeline, and is used for salt separation and crystallization of the finely filtered high-salt wastewater. A base plate 4 is fixedly connected to the bottom of one side of the treatment tank 1, and the evaporator crystallizer 5 is fixedly connected to the top of the base plate 4.

[0034] It should be noted that the low-energy-consumption high-salt wastewater desalination crystallization device provided in this application embodiment uses the stirring unit of the pretreatment mechanism 2 in the treatment tank 1 to fully mix the high-salt wastewater with the coagulant to promote flocculation reaction. The detachable filter plate 204 intercepts large suspended particles to achieve preliminary purification. In the filter assembly 3, the pump body 301, together with the filter cylinder 304 and the detachable ultrafiltration membrane assembly 305, further finely filters the pre-purified high-salt wastewater. Finally, the evaporator crystallizer 5 performs desalination crystallization on the finely filtered high-salt wastewater. The whole device realizes multi-stage and efficient treatment of high-salt wastewater, effectively improving the wastewater purification effect and desalination crystallization efficiency. At the same time, it facilitates equipment maintenance and impurity cleaning, and reduces energy consumption and operating costs.

[0035] In this embodiment, the pretreatment mechanism 2 further includes a scraping assembly. The scraping assembly includes a second motor 206, a rotating rod 207, a first gear 209, a second gear 210, a threaded rod 211, a spiral discharge shaft 208, and a scraper 212. The second motor 206 is mounted on the side wall of the treatment chamber 1. One end of the rotating rod 207 is connected to the output end of the second motor 206, and the other end extends to the sedimentation chamber of the treatment chamber 1. One end of the spiral discharge shaft 208 is connected to the end of the rotating rod 207 away from the second motor 206, and the other end is connected to the outlet of the treatment chamber 1 for discharging sediment from the bottom of the sedimentation chamber. The first gear 209 is fixedly connected to the outer wall of the rotating rod 207 and located outside the treatment chamber 1; the second gear 210 meshes with the first gear 209. The threaded rod 211 is fixedly connected to the second gear 210 and extends to the sedimentation chamber. The scraper 212 is threadedly connected to the threaded rod 211 via a threaded sleeve for cleaning the surface of the removable filter plate 204. Specifically, the threaded rod 211 is coaxially fixed to the rotation axis of the second gear 210.

[0036] It should be noted that the scraping component added to the pretreatment mechanism 2 in this embodiment drives the rotating rod 207 via the second motor 206 to rotate the spiral discharge shaft 208, which can efficiently discharge the sediment at the bottom of the sedimentation chamber, avoiding accumulation that affects the processing efficiency. At the same time, the first gear 209 on the rotating rod 207 drives the second gear 210 and the threaded rod 211 to rotate, so that the scraper 212 moves along the threaded rod 211 to clean the surface of the detachable filter plate 204, preventing flocculents from adhering and clogging, ensuring the filtration effect and stable operation of the device, extending the service life of the equipment, and reducing the cost of manual cleaning and maintenance difficulty.

[0037] In this embodiment, the top of the detachable filter plate 204 is provided with a sliding groove, and the top of the scraper 212 is provided with a slider 12 that slides in cooperation with the sliding groove. This design, where the sliding groove on the top of the detachable filter plate 204 slides in cooperation with the slider 12 on the top of the scraper 212, allows the scraper 212 to move stably along the sliding groove when cleaning the surface of the detachable filter plate 204. This effectively prevents the scraper 212 from shifting or shaking during movement, ensuring precise and efficient cleaning and improving the cleaning effect. Furthermore, this sliding cooperation structure is simple and reliable, reducing the failure rate of the device and further ensuring stable operation and processing efficiency.

[0038] In this embodiment, the low-energy-consumption, high-salt wastewater desalination crystallization device further includes a housing 205. The first gear 209 and the second gear 210 are both disposed within the housing 205. The second motor 206 is mounted on the outer wall of the housing 205, and its output end extends into the inner cavity of the housing 205. The housing 205 provides an independent and enclosed space for the first gear 209 and the second gear 210, effectively preventing the entry of external dust and impurities, avoiding gear wear and jamming, ensuring the smoothness and accuracy of gear transmission, extending gear service life, and reducing the device failure rate.

[0039] In this embodiment, the low-energy-consumption, high-salt wastewater desalination crystallization device further includes a membrane self-cleaning mechanism. The membrane self-cleaning mechanism includes a third motor 6, a connecting shaft 7, and a cleaning plate 8. The third motor 6 is installed at the bottom of the filter cartridge 304, and its output end extends into the filter cartridge 304 and is connected to the connecting shaft 7. The cleaning plate 8 is fixedly connected to the outer wall of the connecting shaft 7 and contacts the surface of the ultrafiltration membrane assembly 305.

[0040] In this embodiment, the ultrafiltration membrane assembly 305 includes a first filter membrane and a second filter membrane. Both the first and second filter membranes are fixedly disposed within a filter cartridge 304 and spaced apart along the height of the filter cartridge 304. The first filter membrane is located above the second filter membrane, and the pore size of the first filter membrane is larger than that of the second filter membrane. Two cleaning plates 8 are provided. The two cleaning plates 8 respectively contact the surfaces of the first and second filter membranes. In a preferred embodiment of this application, both the first and second filter membranes are made of polyvinylidene fluoride (PVDF).

[0041] It should be noted that in this embodiment, the membrane self-cleaning mechanism drives the connecting shaft 7 to rotate the cleaning plate 8 via the third motor 6, which can clean the surfaces of the first and second filter membranes, which are spaced apart and have different pore sizes, in real time. This effectively removes impurities attached to the membranes, avoids membrane clogging, ensures the filtration performance and flux of the ultrafiltration membrane module 305, and improves the fine filtration efficiency. At the same time, the dual-membrane staged filtration design further enhances the wastewater purification effect. The overall device reduces membrane maintenance costs and energy consumption while ensuring efficient salt separation and crystallization.

[0042] Furthermore, the pore size of the first filter membrane is 0.008-0.01 micrometers; and the pore size of the second filter membrane is 0.005-0.008 micrometers.

[0043] In this embodiment, the stirring unit includes a first motor 202, a stirrer 203, and a mounting plate 201. The mounting plate 201 is fixed to the top of the processing tank 1. The first motor 202 is mounted on the top of the processing tank 1. The stirrer 203 is connected to the output end of the first motor 202 and extends into the sedimentation chamber.

[0044] It should be noted that the stirring unit is securely fixed to the top of the treatment tank 1 by the mounting plate 201. The first motor 202 is installed at this location and drives the stirrer 203 to extend into the sedimentation chamber for rotation. This allows the high-salt wastewater and coagulant to mix quickly and thoroughly, effectively promoting the flocculation reaction, improving the flocculation effect, accelerating the formation of large suspended particles, and providing favorable conditions for subsequent filtration and purification steps. This, in turn, improves the treatment efficiency and effect of the entire low-energy-consumption high-salt wastewater desalination crystallization device. Furthermore, this structural design is simple and reasonable, facilitating installation and maintenance. In the pretreatment stage, polyaluminum chloride is added to the sedimentation chamber of the treatment tank 1 as a flocculant. The first motor 202 of the stirring unit drives the stirrer 203 to perform forced mixing at a speed of 100-150 r / min.

[0045] In this embodiment, the low-energy-consumption, high-salt wastewater desalination crystallization device further includes a fixing frame 9. The fixing frame 9 is installed on the side wall of the treatment tank 1. The filter cartridge 304 is installed on the fixing frame 9.

[0046] It should be noted that in this embodiment, a fixing frame 9 is added and installed on the side wall of the processing box 1 to support the filter cylinder 304. This design makes the installation of the filter cylinder 304 more stable and reliable, and reduces problems such as shaking and displacement of the filter cylinder 304 caused by vibration of the device operation or external factors.

[0047] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0048] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A low-energy-consumption, high-salt wastewater desalination crystallization device, characterized in that, include: Treatment tank (1) is used to receive and pretreat high-salt wastewater; The pretreatment mechanism (2) is located inside the treatment tank (1) and includes: a stirring unit, fixed to the top of the treatment tank (1) and extending into its inner cavity, used to fully mix the high-salt wastewater with the coagulant to promote the flocculation reaction; a detachable filter plate (204), vertically arranged in the inner cavity of the treatment tank (1), dividing the inner cavity of the treatment tank (1) into a sedimentation chamber and a filtration chamber, used to intercept large particulate suspended matter generated by the flocculation reaction, so that the high-salt wastewater entering the filtration chamber is initially purified; wherein, the side wall of the sedimentation chamber of the treatment tank (1) is provided with an outlet, the outlet is provided with a cleaning pipe (13), and the cleaning pipe (13) is provided with a valve; The filter assembly (3) includes: a pump body (301) disposed on the top of the treatment tank (1), the input end of which is connected to the filter chamber through a first connecting pipe (302); a filter cylinder (304) fixed to the outer wall of the treatment tank (1), the inlet of which is connected to the output end of the pump body (301) through a second connecting pipe (303); and an ultrafiltration membrane assembly (305) detachably disposed in the filter cylinder (304) for fine filtration of the pre-purified high-salt wastewater; wherein, a clean water outlet (11) is provided at the bottom of the side wall of the filter cylinder (304), and a drain pipe (10) is provided in the middle of the side wall for cleaning impurities on the ultrafiltration membrane assembly (305); The evaporator crystallizer (5) is connected to the clean water outlet (11) of the filter assembly (3) through a conveying pipeline and is used to perform salt separation crystallization on the finely filtered high-salt wastewater.

2. The low-energy-consumption, high-salt wastewater desalination crystallization device according to claim 1, characterized in that, The pretreatment mechanism (2) also includes a scraping component; The scraping assembly includes a second motor (206), a rotating rod (207), a first gear (209), a second gear (210), a threaded rod (211), a spiral discharge shaft (208), and a scraper (212); The second motor (206) is mounted on the side wall of the processing box (1); One end of the rotating rod (207) is connected to the output end of the second motor (206), and the other end extends to the sedimentation chamber of the processing box (1); One end of the spiral discharge shaft (208) is connected to the end of the rotating rod (207) away from the second motor (206), and the other end is connected to the outlet of the processing box (1) for discharging the sediment at the bottom of the sedimentation chamber; The first gear (209) is fixedly connected to the outer wall of the rotating rod (207) and located outside the processing box (1), and the second gear (210) meshes with the first gear (209); The threaded rod (211) is fixedly connected to the second gear (210) and extends to the sedimentation chamber; The scraper (212) is threadedly connected to the threaded rod (211) via a threaded sleeve and is used to clean the surface of the removable filter plate (204).

3. The low-energy-consumption, high-salt wastewater desalination crystallization device according to claim 2, characterized in that, The top of the detachable filter plate (204) is provided with a sliding groove, and the top of the scraper (212) is provided with a slider (12) that slides in cooperation with the sliding groove.

4. The low-energy-consumption, high-salt wastewater desalination crystallization device according to claim 2, characterized in that, It also includes the housing (205); Both the first gear (209) and the second gear (210) are disposed within the housing (205); The second motor (206) is mounted on the outer wall of the housing (205), and its output end extends into the inner cavity of the housing (205).

5. The low-energy-consumption, high-salt wastewater desalination crystallization device according to claim 1, characterized in that, It also includes a membrane self-cleaning mechanism; The membrane self-cleaning mechanism includes a third motor (6), a connecting shaft (7), and a cleaning plate (8); The third motor (6) is installed at the bottom of the filter cylinder (304), and its output end extends into the filter cylinder (304) and is connected to the connecting shaft (7); The cleaning plate (8) is fixedly connected to the outer wall of the connecting shaft (7) and in contact with the surface of the ultrafiltration membrane assembly (305).

6. The low-energy-consumption, high-salt wastewater desalination crystallization device according to claim 5, characterized in that, The ultrafiltration membrane assembly (305) includes a first filtration membrane and a second filtration membrane; The first filter membrane and the second filter membrane are both fixedly disposed inside the filter cylinder (304) and are spaced apart along the height direction of the filter cylinder (304); The first filter membrane is located above the second filter membrane, and the pore size of the first filter membrane is larger than the pore size of the second filter membrane. Two cleaning plates (8) are provided; The two cleaning plates (8) are in contact with the surfaces of the first filter membrane and the second filter membrane, respectively.

7. The low-energy-consumption, high-salt wastewater desalination crystallization device according to claim 1, characterized in that, The stirring unit includes a first motor (202), a stirrer (203), and a mounting plate (201); The mounting plate (201) is fixed to the top of the processing box (1); The first motor (202) is mounted on the top of the processing box (1); The stirrer (203) is connected to the output end of the first motor (202) and extends to the sedimentation chamber.

8. The low-energy-consumption, high-salt wastewater desalination crystallization device according to claim 1, characterized in that, It also includes a mounting bracket (9); The fixing frame (9) is installed on the side wall of the processing box (1); The filter cartridge (304) is mounted on the mounting bracket (9).

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