Membrane separation pretreatment device for high-salinity wastewater

Abstract

The invention discloses a high-salinity wastewater membrane separation pretreatment device which comprises an impurity removal unit, a membrane separation unit, a membrane separation unit, a membrane separation unit and a membrane separation unit which are sequentially arranged in the flowing direction of wastewater, and the impurity removal unit comprises an impurity removal chamber, a grating and a crushing assembly; the oil removal unit comprises a dissolved air tank and an air flotation chamber; the settling unit comprises a settling chamber and a settling tower plate; the filtering unit comprises a filtering chamber, a filtering cylinder and a filtering assembly. The device can crush large-particle pollutants in the high-salinity wastewater, remove pollutants such as petroleum through air flotation, fully mix the wastewater with a medicament, stand and settle, fully filter the wastewater and then send the wastewater to a membrane concentration process step, has the advantages of simple structure, convenience in operation, high operation efficiency, high practicability and the like, and is suitable for large-scale popularization and application.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and more specifically, to a high-salinity wastewater membrane separation pretreatment device. Background Art

[0002] With the development of industrialization, high-salinity wastewater has become a major environmental problem facing industrial development at this stage. High-salinity wastewater refers to wastewater with a total salt content of at least 1% and a high Cl - 、SO4 2- 、Na + , Ca 2+ In addition, some of them also contain petroleum, difficult-to-decompose organic matter and toxic substances. High-salt wastewater has a wide range of sources, mainly from: (1) concentrated brine produced during seawater desalination; (2) high-salt wastewater directly discharged during industrial production (such as printing and dyeing, steelmaking, petrochemicals, pharmaceutical salt production, etc.); (3) domestic production sewage generated by the use of high-salt groundwater, seawater, etc. in life. If high-salt wastewater is directly discharged into the environment, and the wastewater contains a large amount of inorganic salt ions, although these ions are essential nutrients for microbial growth, when the concentration of these ions is too high, they will inhibit and toxicize microorganisms. For example, when the salt concentration is high, the osmotic pressure becomes high, causing the microbial cells to dehydrate and die. In addition, the accumulation of soluble salts in the soil will lead to land degradation, water quality deterioration and serious problems related to agricultural development. More than 20% of agricultural land in the world is threatened by salinization, and the area of ​​saline-alkali land is still expanding, threatening human food production.

[0003] The high-salinity wastewater membrane separation process includes three core process steps: pretreatment, membrane concentration separation, and evaporation crystallization. Pretreatment is the first step in the treatment of high-salinity wastewater. It mainly uses physical and chemical methods to remove pollutants such as suspended matter, oil, and heavy metals in the wastewater to prepare for subsequent treatment processes. The existing pretreatment process steps mainly include facilities such as grids, sedimentation tanks, and filters. If the pretreatment process steps do not meet the standards, excessive grid residue will be generated, which will cause great damage to subsequent processing equipment. Therefore, the present invention aims to provide a high-salinity wastewater membrane separation pretreatment device. Summary of the invention

[0004] The present invention provides a high-salt wastewater membrane separation pretreatment device, which can crush large particle pollutants in high-salt wastewater, remove pollutants such as petroleum through flotation, fully mix the wastewater with a reagent and let it settle statically, and send the wastewater to a membrane concentration process step after fully filtering it. It has the advantages of simple structure, convenient operation, efficient operation, strong practicality, etc., and is suitable for large-scale promotion and use.

[0005] In order to achieve these purposes and other advantages according to the present invention, a high-salinity wastewater membrane separation pretreatment device is provided, comprising: The impurity removal unit comprises an impurity removal chamber, a grille, and a crushing assembly, wherein the impurity removal chamber is provided with a first wastewater inlet, a first sewage outlet, and a first wastewater outlet, the grille is obliquely provided inside the impurity removal chamber, the crushing assembly is located on the upstream side of the grille, the first wastewater inlet and the first sewage outlet are also located on the upstream side of the grille, and the first wastewater outlet is located on the downstream side of the grille; The oil removal unit comprises an air dissolving tank and an air flotation chamber, wherein the air dissolving tank is provided with a second wastewater inlet, an air inlet, and a second wastewater outlet, wherein the first wastewater outlet is connected to the second wastewater inlet through a water pump, and the air flotation chamber is provided with a third wastewater inlet, a third wastewater outlet, and a third sewage outlet, wherein the third wastewater inlet is connected to the second wastewater outlet, and a scraping assembly is provided above the air flotation chamber, and the third sewage outlet is provided on the downstream side of the scraping assembly; A sedimentation unit, comprising a sedimentation chamber and a sedimentation plate, wherein the sedimentation chamber is provided with a fourth wastewater inlet, a drug inlet, a fourth sewage outlet, and a fourth wastewater outlet, wherein the fourth wastewater inlet is connected to the third wastewater outlet, wherein a plurality of sedimentation plates are vertically arranged inside the sedimentation chamber, wherein one end of the plurality of sedimentation plates are alternately connected to the top and the bottom of the sedimentation chamber, and the other ends are staggered and form water-passing intervals with the top and the bottom of the sedimentation chamber, wherein the upstream side of the first sedimentation plate is provided with the drug inlet, and the drug inlet is arranged higher than the fourth wastewater inlet, and the downstream side of the last sedimentation plate is provided with the fourth sewage outlet; The filter unit comprises a filter chamber, a filter cartridge, and a filter assembly, wherein the filter chamber is provided with a fifth wastewater inlet and a fifth wastewater outlet, the fourth wastewater outlet is connected to the fifth wastewater inlet through a water pump, the filter cartridge is connected through a bearing and horizontally mounted on the filter chamber, the filter cartridge is a hollow and non-through cylindrical structure with filter holes, the fifth wastewater inlet delivers wastewater into the filter cartridge through a pipeline along the axis of the upstream end of the filter cartridge, the filter assembly comprises an electric telescopic rod and a telescopic plate, the electric telescopic rod extends into the filter cartridge along the axis of the downstream end of the filter cartridge, the telescopic plate is vertically mounted at the end of the electric telescopic rod, and a circle of bristles is provided on the outer periphery of the telescopic plate to contact the inner wall of the filter cartridge.

[0006] Preferably, the crushing assembly includes a crushing motor, a crushing blade, and a crushing barrel. The output shaft of the crushing motor extends vertically into the impurity removal chamber. The output shaft of the crushing motor is provided with the crushing blade. The output shaft of the crushing motor is also provided with the crushing barrel. The crushing barrel is a hollow and axially through-hole cylindrical structure with filter holes. The crushing barrel is arranged on the outer periphery of the crushing blade. The first wastewater inlet is located above the crushing barrel.

[0007] Preferably, the crushing blade comprises at least two layers, the length of the crushing blade decreases from top to bottom, and the diameter of the crushing cylinder decreases synchronously from top to bottom.

[0008] Preferably, the scraper assembly includes a scraper motor, a pair of scraper shafts, a conveyor belt and a plurality of scraper plates circulating on the conveyor belt. A slag collecting box is provided on the downstream side of the scraper assembly, and a slag collecting roller is provided near the third sewage outlet of the slag collecting box. The scraper motor drives a scraper shaft on the upstream side, and the other scraper shaft on the downstream side realizes reverse synchronous rotation with the slag collecting roller through gear transmission.

[0009] Preferably, the scraper plate is a comb-shaped structure, and the slag collecting roller is provided with a tooth structure that interlaces with the scraper plate.

[0010] Preferably, the filter assembly also includes a filter shaft, which is connected to the filter chamber through a bearing and horizontally mounted on the filter chamber, the filter shaft is located above the filter cartridge, the neck of the electric telescopic rod is threadedly connected to a limit nut, the limit nut is axially limited to the filter chamber, the limit nut is belt-driven with the filter shaft, and a circle of bristles is provided on the outer periphery of the filter shaft to contact the outer wall of the filter cartridge.

[0011] The present invention has at least the following beneficial effects: First, the present invention integrates an impurity removal unit, an oil removal unit, a sedimentation unit, and a filtration unit to fully and orderly pretreat high-salt wastewater, remove large particle pollutants, petroleum and other pollutants, flocculation and sedimentation pollutants, etc. in the high-salt wastewater in turn, and send the wastewater to the membrane concentration process step after being fully filtered. It has the advantages of simple structure, convenient operation, efficient operation, strong practicality, etc. The device has low energy consumption and high efficiency. The feasibility of separation through membrane concentration is greatly improved, and the impact on subsequent process steps is reduced. It is suitable for large-scale promotion and use.

[0012] Second, a grid is set at an angle of 60-80° inside the impurity removal chamber, a first wastewater inlet and a first sewage outlet are set on the upstream side of the grid, and a first wastewater outlet is set on the downstream side of the grid. In order to avoid clogging of the grid, a crushing assembly is set on the upstream side of the grid. The crushing method is not limited to crush large particles and large-volume pollutants. The waste is discharged from the first sewage outlet, and the wastewater is discharged from the first wastewater outlet after crushing and passing through the grid. The dissolved gas tank is connected to the air source through the air inlet, and the gas-liquid mixture in the dissolved gas tank enters the flotation chamber. The outer layer of the microbubble is an elastic water film, which is formed by the orderly and tight arrangement of water molecules under the action of van der Waals force. The air cannot escape, and it carries pollutants such as oil, which has strong stability. The degreasing agent can also be used to demulsify the oil to form flocs. The gas floating slag generated in the flotation chamber is removed by the scraping assembly through the third sewage outlet, and the wastewater is discharged from the third wastewater outlet. The sedimentation chamber is provided with multiple sedimentation plates to form a circuitous path. The drug inlet is used to add coagulants and coagulants. The drug inlet is set on the path of wastewater flow. The wastewater is fully mixed with the coagulant and coagulant, and flows to the downstream side of the last sedimentation plate. The clear liquid is allowed to stand to produce flocculent sediment and stratify. The wastewater after solid-liquid separation is discharged through the fourth wastewater outlet, and the sediment is discharged from the fourth sewage outlet. The filter chamber is provided with a filter cartridge, which is sent to the subsequent process steps after the final filtration of the wastewater. The filter cartridge is a non-powered cylinder, which is connected to the filter chamber through a bearing to achieve rotational connection. The filter cartridge is a relatively closed hollow structure. A pipeline is set at the upstream axis of the filter cartridge to connect to the fourth wastewater outlet to introduce wastewater. An electric telescopic rod is set at the downstream axis of the filter cartridge to push the telescopic plate to move along the axis of the filter cartridge, so that the bristles on the outer periphery of the telescopic plate fully scrape the filter holes on the inner wall of the filter cartridge to clean, and the wastewater is discharged through the fifth wastewater outlet.

[0013] Third, when the present invention is used, the wastewater is sequentially passed through the impurity removal chamber, the oil removal chamber, the sedimentation chamber, and the filter chamber. When the wastewater flows through the impurity removal chamber, the first sewage outlet is closed, and the wastewater enters from the first wastewater inlet. The crushing component is started, and the wastewater is discharged from the first wastewater outlet, and the waste material is discharged from the first sewage outlet. When the wastewater flows through the oil removal chamber, the gas dissolving tank is started to mix the gas and liquid and the oil removal agent. The scraping component is started to remove the gas floating slag from the third sewage outlet, and the wastewater is discharged from the third wastewater outlet. When the wastewater flows through the sedimentation chamber, the fourth sewage outlet is closed, and the agent is added. After the wastewater and the agent are fully mixed, the wastewater is allowed to stand still, and the wastewater is discharged from the fourth wastewater outlet, and the sediment is discharged from the fourth sewage outlet. When the wastewater flows through the filter chamber, the electric telescopic rod is closed, and the waste material is discharged from the fifth sewage outlet. When the filter hole of the filter cartridge tends to be blocked, the electric telescopic rod is started to telescopically move, and the telescopic rod drives the wool to clean the filter hole of the filter cartridge.

[0014] Fourth, by setting up a crushing component, large particles and large-volume pollutants can be sheared and crushed. The output shaft of the crushing motor is connected to the top bearing of the impurity removal chamber to achieve relative rotation. The output shaft of the crushing motor is provided with two to three crushing blades, which are tilted downward. When rotating at high speed, large particles and large-volume pollutants are sheared. By setting up a crushing barrel, an outer retaining wall is formed, so that the sheared pollutants collide back and forth, and overflow from the filter holes of the crushing barrel under high-speed rotation, thereby increasing the crushing effect. Furthermore, the crushing blades are set to an upper and lower multi-layer structure, and the size specifications of the crushing blades and the crushing barrel are set to be consistent and reduced. The turbulence of the wastewater is accelerated by reducing the diameter, further increasing the crushing effect.

[0015] Fifth, the scraping assembly is set to scrape the gas slag. The scraping motor drives one scraping shaft to rotate, and the other scraping shaft is rotated by belt transmission. The scraping plates are set at equal intervals and move in a cycle to skim the gas slag above the liquid surface from upstream to downstream. The slag collecting roller and the other scraping shaft rotate at the same speed and in opposite directions through a gear assembly composed of a pair of gears, and the gas slag is further transported to the third sewage outlet. By setting the comb teeth of the scraping plate and the slag collecting roller staggered matching structure, the two do not contact or hinder each other, and cooperate to skim the gas slag of the entire axial length, further improving the scraping efficiency.

[0016] Sixth, the electric telescopic rod is threadedly connected to the limit nut, and the limit nut cannot move horizontally but can only rotate. When the electric telescopic rod moves horizontally, the limit nut is driven to rotate in place. That is, when the filter cartridge needs to be cleaned, the electric telescopic rod provides power to synchronously drive the filter shaft to rotate. Since the filter cartridge is an unpowered cylinder, the rotation of the filter shaft can appropriately drive the filter cartridge to rotate. A circle of bristles is provided on the outer periphery of the telescopic plate to contact the inner wall of the filter cartridge, and a circle of bristles is provided on the outer periphery of the filter shaft to contact the outer wall of the filter cartridge to clean the filter cartridge synchronously.

[0017] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a technical solution of the present invention. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0020] It should be understood that the terms such as "having", "including" and "comprising" used herein do not exclude the existence or addition of one or more other elements or combinations thereof. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific circumstances. The orientation or position relationship indicated by the terms "transverse", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention 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 a limitation of the present invention.

[0021] like Figure 1 As shown, the present invention provides a high-salinity wastewater membrane separation pretreatment device, including: The impurity removal unit comprises an impurity removal chamber 1, a grille 2, and a crushing assembly. The impurity removal chamber 1 is provided with a first wastewater inlet, a first sewage outlet, and a first wastewater outlet. The grille 2 is obliquely arranged inside the impurity removal chamber 1. The crushing assembly is located on the upstream side of the grille 2. The first wastewater inlet and the first sewage outlet are also located on the upstream side of the grille 2. The first wastewater outlet is located on the downstream side of the grille 2. The oil removal unit comprises an air dissolving tank 6 and an air flotation chamber 7. The air dissolving tank 6 is provided with a second wastewater inlet, an air inlet, and a second wastewater outlet. The first wastewater outlet is connected to the second wastewater inlet through a water pump. The air flotation chamber 7 is provided with a third wastewater inlet, a third wastewater outlet, and a third sewage outlet. The third wastewater inlet is connected to the second wastewater outlet. A scraping assembly is provided above the air flotation chamber 7, and the third sewage outlet is provided on the downstream side of the scraping assembly. A sedimentation unit, comprising a sedimentation chamber 11 and a sedimentation plate 12, wherein the sedimentation chamber 11 is provided with a fourth wastewater inlet, a drug inlet, a fourth sewage outlet, and a fourth wastewater outlet, wherein the fourth wastewater inlet is connected to the third wastewater outlet, and a plurality of sedimentation plates 12 are vertically arranged inside the sedimentation chamber 11, wherein one end of the plurality of sedimentation plates 12 is alternately connected to the top and the bottom of the sedimentation chamber 11, and the other end is staggered and forms a water-passing interval with the top and the bottom of the sedimentation chamber 11, wherein the upstream side of the first sedimentation plate 12 is provided with the drug inlet, and the drug inlet is arranged higher than the fourth wastewater inlet, and the downstream side of the last sedimentation plate 12 is provided with the fourth sewage outlet; The filter unit includes a filter chamber 13, a filter cartridge 14, and a filter assembly. The filter chamber 13 is provided with a fifth wastewater inlet and a fifth wastewater outlet. The fourth wastewater outlet is connected to the fifth wastewater inlet through a water pump. The filter cartridge 14 is connected through a bearing and horizontally mounted on the filter chamber 13. The filter cartridge 14 is a hollow and non-through cylindrical structure with filter holes. The fifth wastewater inlet sends wastewater into the filter cartridge 14 along the axis of the upstream end of the filter cartridge 14 through a pipeline. The filter assembly includes an electric telescopic rod 15 and a telescopic plate 16. The electric telescopic rod 15 extends into the filter cartridge 14 along the axis of the downstream end of the filter cartridge 14. The telescopic plate 16 is vertically installed at the end of the electric telescopic rod 15. A circle of bristles is provided on the outer periphery of the telescopic plate 16 to contact the inner wall of the filter cartridge 14.

[0022] In the above technical scheme, the impurity removal unit, oil removal unit, sedimentation unit and filtration unit are integrated to fully and orderly pre-treat the high-salt wastewater, and remove large particle pollutants, petroleum and other pollutants, flocculation and sedimentation pollutants, etc. in the high-salt wastewater in turn. After the wastewater is fully filtered, it is sent to the membrane concentration process step. It has the advantages of simple structure, convenient operation, efficient operation and strong practicality. The device has low energy consumption and high efficiency. The feasibility of separation through membrane concentration is greatly improved, which reduces the impact on subsequent process steps and is suitable for large-scale promotion and use.

[0023] A grid 2 is arranged inside the impurity removal chamber 1 at an angle of 60-80°, a first wastewater inlet and a first sewage outlet are arranged on the upstream side of the grid 2, and a first sewage outlet is arranged on the downstream side of the grid 2. In order to avoid clogging of the grid 2, a crushing assembly is arranged on the upstream side of the grid 2. The crushing method is not limited, and large particles and large-volume pollutants can be crushed. Waste materials are discharged from the first sewage outlet, and wastewater is discharged from the first sewage outlet after crushing and passing through the grid. The air dissolving tank 6 is connected to the air source through the air inlet, and gas-liquid mixing is achieved in the air dissolving tank 6 to enter the flotation chamber 7. The outer layer of the microbubble is a layer of elastic water film, which is formed by water molecules arranged in an orderly and tight manner under the action of van der Waals force. Air cannot escape, and pollutants such as petroleum are entrained, and it has strong stability. A degreasing agent can also be used to demulsify petroleum to form flocs. The air floating slag generated in the flotation chamber is removed by the scraping assembly through the third sewage outlet, and the wastewater is discharged from the third wastewater outlet. The sedimentation chamber 11 is provided with a plurality of sedimentation plates 12 to form a circuitous path. The drug inlet is used to add coagulants and coagulant aids. The drug inlet is arranged on the path of the wastewater flow. The wastewater is fully mixed with the coagulant and coagulant aid and flows to the downstream side of the last sedimentation plate 12. The wastewater is allowed to stand to produce flocculent precipitate in the clear liquid and stratify. The wastewater after solid-liquid separation is discharged through the fourth wastewater outlet, and the precipitate is discharged from the fourth sewage outlet. The filter chamber 13 is provided with a filter cartridge 14, which performs final filtration on the wastewater and sends it to subsequent process steps. The filter cartridge 14 is an unpowered cylinder, which is connected to the filter chamber 13 through a bearing to achieve rotational connection. The filter cartridge 14 is a relatively closed hollow structure. A pipeline is arranged at the upstream axis of the filter cartridge 14 to connect to the fourth wastewater outlet to introduce wastewater. An electric telescopic rod 15 is arranged at the downstream axis of the filter cartridge 14 to push the telescopic plate 16 to move along the axis of the filter cartridge 14, so that the bristles on the outer periphery of the telescopic plate 16 fully scrape the filter holes on the inner wall of the filter cartridge 14 for cleaning, and the wastewater is discharged through the fifth wastewater outlet.

[0024] When the present invention is used, wastewater is sequentially discharged from the impurity removal chamber 1, the oil removal chamber, the sedimentation chamber 11, and the filter chamber 13. When the wastewater flows through the impurity removal chamber 1, the first sewage outlet is closed to allow the wastewater to enter from the first wastewater inlet, the crushing component is started to allow the wastewater to be discharged from the first wastewater outlet, and the waste material is discharged from the first sewage outlet. When the wastewater flows through the oil removal chamber, the air dissolving tank 6 is started to mix the gas and liquid and the oil removal agent, and the scraping component is started to remove the gas floating slag from the third sewage outlet, so that the wastewater is discharged from the third wastewater outlet. When the waste water flows through the sedimentation chamber 11, the fourth sewage outlet is closed, and the reagent is added to make the waste water and the reagent fully mixed and then let it stand, so that the waste water is discharged from the fourth wastewater outlet, and the sediment is discharged from the fourth sewage outlet. When the waste water flows through the filter chamber 13, the electric telescopic rod 15 is closed, and the waste is discharged from the fifth sewage outlet. When the filter holes of the filter cartridge 14 tend to be blocked, the electric telescopic rod 15 is started to make the electric telescopic rod 15 telescopic movement, and the telescopic rod drives the wool to clean the filter holes of the filter cartridge 14.

[0025] In another technical solution, the crushing assembly includes a crushing motor 3, a crushing blade 4, and a crushing barrel 5. The output shaft of the crushing motor 3 extends vertically into the impurity removal chamber 1. The output shaft of the crushing motor 3 is provided with the crushing blade 4. The output shaft of the crushing motor 3 is also provided with the crushing barrel 5. The crushing barrel 5 is a hollow and axially through-hole cylindrical structure with filter holes. The crushing barrel 5 is arranged on the outer periphery of the crushing blade 4, and the first wastewater inlet is located above the crushing barrel 5.

[0026] In the above technical scheme, a crushing assembly is provided to realize shearing and crushing of large particles and large volumes of pollutants. The output shaft of the crushing motor 3 is connected to the top bearing of the impurity removal chamber 1 to realize relative rotation. The output shaft of the crushing motor 3 is provided with crushing blades 4, the number of which is two to three and which are arranged obliquely downward. When rotating at a high speed, large particles and large volumes of pollutants are sheared. By providing a crushing barrel 5, an outer retaining wall is formed, so that the sheared pollutants collide back and forth and overflow from the filter holes of the crushing barrel 5 under high-speed rotation, thereby increasing the crushing effect.

[0027] In another technical solution, the crushing blade 4 includes at least two layers, the length of the crushing blade 4 decreases from top to bottom, and the diameter of the crushing tube 5 decreases synchronously from top to bottom. Furthermore, the crushing blade 4 is set to an upper and lower multi-layer structure, and the size specifications of the crushing blade 4 and the crushing tube 5 are set to decrease in a consistent manner, so as to accelerate the turbulence of the wastewater by reducing the diameter, and further increase the crushing effect.

[0028] In another technical solution, the scraper assembly includes a scraper motor, a pair of scraper shafts, a conveyor belt, and a plurality of scraper plates 8 circulating on the conveyor belt. A scraper collecting box 9 is provided on the downstream side of the scraper assembly. A scraper collecting roller is provided near the third sewage outlet of the scraper box 9. The scraper motor drives a scraper shaft on the upstream side, and the other scraper shaft on the downstream side realizes reverse synchronous rotation with the scraper collecting roller through gear transmission.

[0029] In the above technical scheme, the scraping of gas slag is achieved by setting up a scraping assembly, the scraping motor drives one scraping shaft to rotate, and the other scraping shaft is rotated by belt transmission, the scraping plates 8 are arranged at equal intervals and move in a cycle, and the gas slag above the liquid surface is skimmed from upstream to downstream, and the slag collecting roller and the other scraping shaft are rotated at the same speed and in opposite directions through a gear assembly composed of a pair of gears, and the gas slag is further transported to the third sewage outlet.

[0030] In another technical solution, the scraper plate 8 is a comb-shaped structure, and the slag collecting roller is provided with a toothed structure staggered with the scraper plate 8. By providing the staggered structure of the comb teeth of the scraper plate 8 and the slag collecting roller, the two do not contact or hinder each other, and cooperate to remove the air floating slag of the entire axial length, thereby further improving the scraping efficiency.

[0031] In another technical solution, the filter assembly also includes a filter shaft 10, which is connected to the filter chamber 13 through a bearing and horizontally mounted on the filter chamber 13. The filter shaft is located above the filter cartridge 14. The neck of the electric telescopic rod 15 is screwed to a limit nut, and the limit nut is axially limited to the filter chamber 13. The limit nut is belt-driven with the filter shaft 10. A circle of bristles is provided on the outer periphery of the filter shaft 10 to contact the outer wall of the filter cartridge 14.

[0032] In the above technical solution, the electric telescopic rod 15 is threadedly connected with the limit nut, and the limit nut cannot move horizontally but can only rotate. When the electric telescopic rod 15 moves horizontally, it drives the limit nut to rotate in place, that is, when the filter cartridge 14 needs to be cleaned, the electric telescopic rod 15 provides power to synchronously drive the filter shaft 10 to rotate. Since the filter cartridge 14 is an unpowered cylinder, the rotation of the filter shaft 10 can appropriately drive the filter cartridge 14 to rotate. A circle of bristles is provided on the outer periphery of the telescopic plate 16 to contact the inner wall of the filter cartridge 14, and a circle of bristles is provided on the outer periphery of the filter shaft 10 to contact the outer wall of the filter cartridge 14, so that the filter cartridge 14 is cleaned synchronously.

[0033] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0034] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. High-salt wastewater membrane separation pretreatment device, characterized in that: It includes the following items arranged in sequence along the wastewater flow direction: The impurity removal unit comprises an impurity removal chamber, a grille, and a crushing assembly, wherein the impurity removal chamber is provided with a first wastewater inlet, a first sewage outlet, and a first wastewater outlet, the grille is obliquely provided inside the impurity removal chamber, the crushing assembly is located on the upstream side of the grille, the first wastewater inlet and the first sewage outlet are also located on the upstream side of the grille, and the first wastewater outlet is located on the downstream side of the grille; The oil removal unit comprises an air dissolving tank and an air flotation chamber, wherein the air dissolving tank is provided with a second wastewater inlet, an air inlet, and a second wastewater outlet, wherein the first wastewater outlet is connected to the second wastewater inlet through a water pump, and the air flotation chamber is provided with a third wastewater inlet, a third wastewater outlet, and a third sewage outlet, wherein the third wastewater inlet is connected to the second wastewater outlet, and a scraping assembly is provided above the air flotation chamber, and the third sewage outlet is provided on the downstream side of the scraping assembly; A sedimentation unit, comprising a sedimentation chamber and a sedimentation plate, wherein the sedimentation chamber is provided with a fourth wastewater inlet, a drug inlet, a fourth sewage outlet, and a fourth wastewater outlet, wherein the fourth wastewater inlet is connected to the third wastewater outlet, wherein a plurality of sedimentation plates are vertically arranged inside the sedimentation chamber, wherein one end of the plurality of sedimentation plates are alternately connected to the top and the bottom of the sedimentation chamber, and the other ends are staggered and form water-passing intervals with the top and the bottom of the sedimentation chamber, wherein the upstream side of the first sedimentation plate is provided with the drug inlet, and the drug inlet is arranged higher than the fourth wastewater inlet, and the downstream side of the last sedimentation plate is provided with the fourth sewage outlet; The filter unit comprises a filter chamber, a filter cartridge, and a filter assembly, wherein the filter chamber is provided with a fifth wastewater inlet and a fifth wastewater outlet, the fourth wastewater outlet is connected to the fifth wastewater inlet through a water pump, the filter cartridge is connected through a bearing and horizontally mounted on the filter chamber, the filter cartridge is a hollow and non-through cylindrical structure with filter holes, the fifth wastewater inlet delivers wastewater into the filter cartridge through a pipeline along the axis of the upstream end of the filter cartridge, the filter assembly comprises an electric telescopic rod and a telescopic plate, the electric telescopic rod extends into the filter cartridge along the axis of the downstream end of the filter cartridge, the telescopic plate is vertically mounted at the end of the electric telescopic rod, and a circle of bristles is provided on the outer periphery of the telescopic plate to contact the inner wall of the filter cartridge.

2. The high-salt wastewater membrane separation pretreatment device according to claim 1, characterized in that: The pulverizing assembly includes a pulverizing motor, a pulverizing blade, and a pulverizing barrel. The output shaft of the pulverizing motor extends vertically into the impurity removal chamber. The output shaft of the pulverizing motor is provided with the pulverizing blade. The output shaft of the pulverizing motor is also provided with the pulverizing barrel. The pulverizing barrel is a hollow and axially through-hole cylindrical structure with filter holes. The pulverizing barrel is arranged on the outer periphery of the pulverizing blade. The first wastewater inlet is located above the pulverizing barrel.

3. The high-salt wastewater membrane separation pretreatment device according to claim 2, characterized in that: The crushing blade comprises at least two layers, the length of the crushing blade decreases from top to bottom, and the diameter of the crushing cylinder decreases synchronously from top to bottom.

4. The high-salt wastewater membrane separation pretreatment device according to claim 1, characterized in that: The scraper assembly includes a scraper motor, a pair of scraper shafts, a conveyor belt and a plurality of scraper plates circulating on the conveyor belt. A scraper collecting box is provided on the downstream side of the scraper assembly. A scraper collecting roller is provided near the third sewage outlet of the scraper box. The scraper motor drives a scraper shaft on the upstream side, and the other scraper shaft on the downstream side realizes reverse synchronous rotation with the scraper collecting roller through gear transmission.

5. The high-salt wastewater membrane separation pretreatment device according to claim 4, characterized in that: The scraper plate is a comb-shaped structure, and the slag collecting roller is provided with a tooth structure staggeredly matched with the scraper plate.

6. The high-salt wastewater membrane separation pretreatment device according to claim 1, characterized in that: The filter assembly also includes a filter shaft, which is connected to the filter chamber through a bearing and horizontally mounted on the filter chamber. The filter shaft is located above the filter cartridge. The neck of the electric telescopic rod is threadedly connected to a limit nut, and the limit nut is axially limited to the filter chamber. The limit nut is belt-driven with the filter shaft, and a circle of bristles is provided on the outer periphery of the filter shaft to contact the outer wall of the filter cartridge.

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