A pretreatment device and method for underground saline-alkali agricultural water

Abstract

This invention relates to a pretreatment device and method for saline-alkali agricultural water in the field of groundwater treatment. Utilizing elastic bands, isolation rods, electric telescopic rods, and folded filter covers, it can separate and collect flocs in batches within the flocculation tank. This avoids the need for subsequent stirring and mixing to disperse settled flocs and also increases the liquid depth of the supernatant in the flocculation tank. Furthermore, it employs an embedded integrated industrial design, integrating multiple filtration and sterilization pretreatment modules with a water ion desalination membrane to form a compact, modular unit suitable for agricultural parks. It can also perform modular purification through a series connection of "head + subsystems" to meet the water supply needs of different agricultural parks.

Description

Technical Field

[0001] This invention relates to a pretreatment device and method for underground saline-alkali agricultural water, and particularly to a pretreatment device and method for underground saline-alkali agricultural water applied in the field of groundwater treatment. Background Technology

[0002] In most agricultural production areas of my country, the quality of exploitable shallow groundwater is generally poor, containing large amounts of organic matter, colloids, silt, suspended sediment, and microorganisms. Silt and suspended sediment easily clog irrigation pipes and fertilization devices, significantly limiting the widespread adoption of precision irrigation in agriculture. Furthermore, pollutants such as organic matter, colloids, and microorganisms enter the crop root environment during irrigation, adversely affecting crop growth and fruit quality. In areas with severe groundwater salinization, the presence of these substances also restricts the application of desalination technologies, accelerates the fouling of nano-desalination membranes, and causes substantial economic losses.

[0003] Chinese invention patent CN202311226810.4 discloses a flocculation device for wastewater treatment. The technical problem it addresses is that during the flocculation process, the flocculant and wastewater are not mixed evenly, resulting in poor flocculation. Furthermore, the common method of uniformly mixing the flocculant and wastewater involves stirring, which can re-disperse already flocculated flocs, further reducing the flocculation effect. The technical implementation of this invention is: a flocculation device for wastewater treatment, including a base frame and a mounting box; the mounting box is installed on the base frame. This invention achieves the detection of wastewater depth within the flocculation tank using a detector, ensuring that the upper liquid level of the wastewater in the flocculation tank is always lower than the upper surface of the mounting box, preventing wastewater overflow. A mixer causes the flocculant and wastewater in the flocculation tank to flow in a clockwise vortex, ensuring sufficient contact and mixing between the flocculant and impurities in the wastewater, effectively improving the wastewater flocculation effect.

[0004] Existing flocculation equipment often focuses on mixing flocculants with wastewater during flocculation. However, during flocculation, the objects that have already flocculated and settled tend to accumulate at the bottom of the flocculation tank. As the subsequent stirring and mixing operations are carried out to enhance the mixing of flocculants and wastewater, the objects that have already flocculated and settled will disperse, affecting the flocculation results. Summary of the Invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to achieve batch discharge of flocculants in the process of sewage flocculation treatment, so as to ensure that the phenomenon of the first flocculated sediment being broken up during subsequent mixing and stirring, and thus ensuring the flocculation quality.

[0006] To address the aforementioned problems, this invention provides a pretreatment device for underground saline-alkali agricultural water, comprising a flocculation tank. Symmetrically arranged mixing units are installed on the outer wall of the flocculation tank. Vertical poles are installed at the center of the top on both sides of the flocculation tank. A drive motor is mounted on the surface of one of the vertical poles. A ball screw is installed between the two vertical poles, with one end of the ball screw connected to the output end of the drive motor. A movable seat is threaded onto the surface of the ball screw. An extension rod is connected to the bottom of the movable seat, and a frame is connected to the bottom of the extension rod. The frame slides against the inner wall of the flocculation tank. The frame has several equidistant elastic bands on its surface, and an electric telescopic rod is installed on the surface of the extension rod. The output end of the electric telescopic rod is connected to a vertically arranged isolation rod. A folded filter cover is connected to one side of the frame, and the diameter of the elastic band is less than one-tenth of the cross-sectional size of the folded filter cover. The bottom surface of the frame is in close contact with the inner bottom wall of the flocculation tank. The folded filter cover is made of filter cloth, and the mesh count of the filter cloth is not less than 300 mesh. The tail end of the folded filter cover is connected to a frame plate made of elastic material, and the cross-section of the folded filter cover is wavy.

[0007] The bottom surface of the isolation bar is equipped with protrusions arranged vertically, and the height difference between the two protrusions is greater than the ring diameter of the tightening elastic band. The lower protrusion is flush with the bottom surface of the isolation bar. The isolation bar is a telescopic structure, and the bottom of the isolation bar is flush with the surface of the frame in its natural state.

[0008] In the aforementioned underground saline-alkali agricultural water pretreatment device, the flocs inside the flocculation tank can be separated and collected in batches. This avoids the need for subsequent stirring and mixing to disperse the settled flocs and also increases the liquid layer depth of the supernatant in the subsequent flocculation tank.

[0009] As a further improvement of this application, when the power end of the electric telescopic pole is in the retracted state, its projection in the vertical direction is located within the top surface of the frame, and the bottom part of the isolation pole is designed in an arc shape, with the bottom of the isolation pole located in the middle of the two tightening elastic bands at the far right in the initial state.

[0010] As a further improvement of this application, the mixing unit includes support frames installed on the outer walls of both sides of the flocculation tank, with the two support frames located at the front and rear ends of the drive motor. A lifting cylinder electrically connected to the drive motor is installed on the top of the support frame, and a platform is connected to the output end of the lifting cylinder. Multiple stirring rods are installed on the bottom of the platform through bearings, and the multiple stirring rods at the bottom of each platform are connected by a conveyor belt. A stirring motor is installed on the top of the platform, and the output end of the stirring motor is connected to the end of one of the stirring rods.

[0011] As a further improvement of this application, stirring blades are installed on the surface of the stirring rod, and the shortest distance between two stirring blades on the same axis is greater than the diameter of the extension rod.

[0012] As a further improvement of this application, a displacement sensor is installed inside the movable seat, and the displacement sensor is electrically connected to the electric telescopic rod.

[0013] As a further improvement of this application, the isolation rod includes a fixed rod body and a movable rod body that is movably sleeved on the outside of the fixed rod body. The fixed rod body is connected to the power end of the electric telescopic rod, and an electromagnet is connected to the bottom end of the fixed rod body. An arc-shaped counterweight magnetic block is connected through the bottom of the movable rod body, and the counterweight magnetic block and the electromagnet attract each other.

[0014] As a further improvement of this application, a method for pretreatment of underground saline-alkali agricultural water includes the following steps:

[0015] S1. Perform coarse filtration using disc filters, using 200-mesh discs to remove particles larger than 50μm from the water;

[0016] S2, flocculation treatment: Flocculant is mixed into the raw water after S1 treatment in real time using a proportional pump, so that the colloids in the raw water are fully flocculated in the flocculation tank and a sedimentation time of more than 2 hours is guaranteed. At the same time, a nano-microbubble ozone generator is used to sterilize the supernatant and reduce the growth of microorganisms.

[0017] S3. Then, the supernatant after flocculation and sterilization in S2 is transferred to the secondary sedimentation tank and the sedimentation time is more than 2 hours to completely settle the remaining flocs.

[0018] S4. By using a booster pump, the supernatant in the secondary sedimentation tank is passed through quartz sand and activated carbon to further remove particulate matter in the water and adsorb colored and odorous organic matter.

[0019] S5. After S4 treatment, the water enters the PP cotton and Parke filter cartridges to remove all impurities larger than 1μm. The groundwater then undergoes desalination treatment and is transferred to a reservoir for storage as agricultural water, awaiting use.

[0020] As a further improvement to this application, S2 also includes the following working steps:

[0021] S21. First, put the flocculant into the flocculation tank, then start the lifting cylinder and stirring motor to drive the stirring rod down into the flocculation tank and mix the flocculant and water in the flocculation tank.

[0022] S22. After stirring for the set time period, use the lifting cylinder to raise the stirring rod and turn off the stirring motor. Then let it stand for the specified time period to wait for flocculation and sedimentation.

[0023] S23. After a specified time period, if there are flocculated materials on the bottom wall of the flocculation tank, start the drive motor at the set speed to drive the moving seat to move slowly away from the drive motor, and then drive the frame and folded filter cover to move horizontally in the flocculation tank and collect the flocculated materials that have passed through into the folded filter cover.

[0024] S24. After the moving seat moves to the end of the ball screw away from the drive motor, the drive motor is turned off, the electric telescopic rod is started, and the isolation rod is moved towards the drive motor. The rightmost tightening rubber band is disengaged from the surface of the frame. Under its own elasticity, the tightening rubber band after being disengaged from the surface of the frame retracts and locks the folded filter cover.

[0025] S25. Then, under the action of the electric telescopic rod, the tightening rubber band is driven to approach the end of the folded filter cover away from the frame, and the flocculent material collected in the folded filter cover is tightened at the end.

[0026] S26. Then retract the electric telescopic rod so that the bottom end of the isolation rod is back in the middle of the two tightening rubber bands at the far right, and restart the drive motor to drive the frame and folded filter cover back to the end of the flocculation tank near the drive motor, waiting for the next round of floc collection.

[0027] As another improvement of this application, symmetrically arranged servo motors are embedded inside the extension rod, and the output end of each servo motor is connected to a linkage rod. The tail end of the linkage rod is connected to the top of the frame through a connecting plate, and the servo motor is electrically connected to the drive motor and the electric telescopic rod.

[0028] In summary, this application utilizes elastic bands, isolation rods, electric telescopic rods, and folded filter covers to separate and collect flocs in batches within the flocculation tank. This avoids the need for subsequent stirring and mixing to disperse settled flocs and also increases the liquid depth of the supernatant in the subsequent flocculation tank. Furthermore, it adopts an embedded integrated industrial design, integrating multiple filtration and sterilization pretreatment modules with a water ion desalination membrane to form a compact, modular unit with a throughput suitable for agricultural parks. It can also perform modular purification through a series connection of "head + subsystems" to meet the water supply needs of different agricultural parks. Attached Figure Description

[0029] Figure 1 This is a general structural diagram of the first and second embodiments of this application;

[0030] Figure 2 These are structural diagrams of the mixing unit according to the first and second embodiments of this application;

[0031] Figure 3 This is an internal view of the flocculation tank according to the first embodiment of this application;

[0032] Figure 4 For this application Figure 3 Enlarged view of point A in the image;

[0033] Figure 5 This is a plan view of the isolation bar according to the first and second embodiments of this application;

[0034] Figure 6 This is a diagram showing the state of the movable seat collecting flocculants near the inner wall of the flocculation tank in the first and second embodiments of this application.

[0035] Figure 7 This is a diagram showing the state of the isolation rod in the first and second embodiments of this application as it begins to tighten the elastic band and leave the frame surface.

[0036] Figure 8 This is a schematic diagram illustrating the overall process of the tightening elastic band leaving the frame and moving to the end of the folded filter cover in the first and second embodiments of this application.

[0037] Figure 9 This is a schematic diagram of the linkage structure according to the second embodiment of this application;

[0038] Figure 10 This is a diagram showing the working state of the linkage rod according to the second embodiment of this application;

[0039] Figure 11 This is a diagram showing the state of the end flocculants entering the folded filter cover in the second embodiment of this application.

[0040] Figure 12 This is a flowchart illustrating the processing of the first embodiment of this application;

[0041] Figure 13 This is a schematic diagram of the structural installation of the third embodiment of this application;

[0042] Figure 14 This is a schematic diagram of the electromagnetic block in the start-up state according to the third embodiment of this application.

[0043] Explanation of the labels in the diagram:

[0044] 1. Flocculation tank; 2. Drive motor; 21. Ball screw; 22. Extension rod; 3. Support frame; 4. Agitator motor; 5. Lifting cylinder; 6. Agitator rod; 7. Isolation rod; 8. Electric telescopic rod; 9. Folded filter cover; 10. Frame; 11. Tightening elastic band; 12. Linkage rod. Detailed Implementation

[0045] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0046] First implementation method:

[0047] Figure 1 , Figure 3-4 This invention illustrates a pretreatment device for underground saline-alkali agricultural water, comprising a flocculation tank 1. Symmetrically arranged mixing units are installed on the outer wall of the flocculation tank 1. Vertical poles are installed at the center of the top on both sides of the flocculation tank 1. A drive motor 2 is mounted on the surface of one of the vertical poles. A ball screw 21 is installed between the two vertical poles, with one end of the ball screw 21 connected to the output end of the drive motor 2. A movable seat is threaded onto the surface of the ball screw 21. An extension rod 22 is connected to the bottom of the movable seat. A frame 10 is connected to the bottom of the extension rod 22, and the frame 10 slides in contact with the inner wall of the flocculation tank 1. The surface of frame 10 is fitted with several equidistant elastic bands 11. An electric telescopic rod 8 is installed on the surface of the extension rod 22. The output end of the electric telescopic rod 8 is connected to a vertically arranged isolation rod 7. A folded filter cover 9 is connected to one side surface of frame 10. The diameter of the elastic bands 11 is less than one-tenth of the cross-sectional size of the folded filter cover 9. The bottom surface of frame 10 is in close contact with the inner bottom wall of flocculation tank 1. The folded filter cover 9 is made of filter cloth with a mesh count of not less than 300 mesh. The tail end of the folded filter cover 9 is connected to a frame plate made of elastic material. The cross-section of the folded filter cover 9 is designed with a wave shape.

[0048] Specifically, when performing batch isolation treatment of the flocculated material, the drive motor 2 needs to be started first, driving the moving seat to slowly move towards one end of the ball screw 21, while simultaneously moving the frame 10 and the pleated filter cover 9 synchronously, collecting the flocculated material that has settled and accumulated on the bottom wall of the flocculation tank 1 and transferring it into the pleated filter cover 9. Once the frame 10 has moved to the side of the flocculation tank 1 away from the drive motor 2 (e.g., ...), ... Figure 6 (As shown), turn off drive motor 2, start electric telescopic rod 8, and drive isolation rod 7 to move the rightmost tightening elastic band 11 of frame 10 surface towards the folded filter cover 9 (as shown). Figure 7 As shown), since the tightening elastic band 11 is in a stretched state when it is attached to the surface of the frame 10, it will return to its original small diameter state under its own elasticity after being removed from the surface of the frame 10, thus tightening the surface of the folded filter cover 9. Subsequently, as the electric telescopic rod 8 (which is always located above the liquid surface inside the flocculation tank 1) continues to extend, it drives the isolation rod 7 to continuously push the tightening elastic band 11 to move along the direction of the folded filter cover 9, pushing and squeezing the flocculent material that was originally loosely stored inside the folded filter cover 9 (such as...). Figure 8 As shown), until the tightening rubber band 11 is displaced to one end of the folded filter cover 9 close to the drive motor 2, the electric telescopic rod 8 is retracted, driving the isolation rod 7 to move back. At this time, the tightening rubber band 11, which is in a small diameter state, will tighten and isolate the end space of the folded filter cover 9 so that the next round of flocculants can continue to enter.

[0049] When the power end of the electric telescopic rod 8 is in the retracted state, its projection in the vertical direction is located within the top surface of the frame 10, and the bottom part of the isolation rod 7 is arc-shaped. In the initial state, the bottom of the isolation rod 7 is located between the two rightmost tightening elastic bands 11.

[0050] After the frame plate is tightened by the elastic band 11 and the folded filter cover 9 is folded, it can become a curved shape. The cross-sectional dimension of the curved plate is larger than that of the elastic band 11. This can prevent the water waves from causing the elastic band 11 to detach from the surface of the folded filter cover 9 during movement.

[0051] Figure 5 The bottom surface of the isolation rod 7 is shown to be equipped with protrusions arranged vertically, and the height difference between the two protrusions is greater than the ring diameter of the tightening elastic band 11. The lower protrusion is flush with the bottom surface of the isolation rod 7. The isolation rod 7 is a telescopic structure, and the bottom of the isolation rod 7 is flush with the surface of the frame 10 in its natural state.

[0052] Specifically, after the isolation rod 7 pushes the tightening elastic band 11 away from the surface of the frame 10, as it approaches the drive motor 2, the two protrusions can provide a certain constraint connection effect on the tightening elastic band 11, so that the isolation rod 7 can drive the tightening elastic band 11 to move synchronously. After reaching the end of the folded filter cover 9 that is close to the drive motor 2, the isolation rod 7 moves in the opposite direction. At the same time, the tightening elastic band 11 can disengage from the isolation rod 7 through the gap between the two protrusions, thereby realizing the tightening and isolation operation of the folded filter cover 9.

[0053] As the isolation rod 7 approaches the frame 10, its bottom will first contact the rightmost tightening elastic band 11. Due to the contraction structure and bottom arc design of the isolation rod 7, it will be forced to move upward and be in a contracted state. With the assistance of the arc structure, it will smoothly move to the middle of the two rightmost tightening elastic bands 11 and naturally fall and stretch under its own weight, so that the bottom of the arc structure is flush with the surface of the frame 10.

[0054] Figure 2 The mixing unit shown includes support frames 3 installed on the outer walls of both sides of the flocculation tank 1, with the two support frames 3 located at the front and rear ends of the drive motor 2. A lifting cylinder 5 electrically connected to the drive motor 2 is installed on the top of the support frame 3. The output end of the lifting cylinder 5 is connected to a platform. Multiple stirring rods 6 are installed on the bottom of the platform through bearings, and the multiple stirring rods 6 at the bottom of each platform are connected by a conveyor belt. A stirring motor 4 is installed on the top of the platform, and the output end of the stirring motor 4 is connected to the end of one of the stirring rods 6.

[0055] The surface of the stirring rod 6 is equipped with stirring blades, and the shortest distance between two stirring blades on the same axis is greater than the diameter of the extension rod 22.

[0056] Specifically, during the mixing process, the lifting cylinder 5 can drive the stirring rod 6 to sink into the flocculation tank 1. Driven by the stirring motor 4, the corresponding mixing operation is achieved, which promotes the mixing of flocculant and water in the flocculation tank 1 and promotes flocculation.

[0057] When it is necessary to collect flocs, the stirring rod 6 can be raised above the liquid surface of the flocculation tank 1 by the lifting cylinder 5 to avoid interference during the collection of flocs.

[0058] The gap between the stirring blades is larger than the diameter of the extension rod 22, so even when the stirring rod 6 is stirring and mixing in the flocculation tank 1, it will not be disturbed by the extension rod 22.

[0059] The movable base is equipped with a displacement sensor, which is electrically connected to the electric telescopic rod 8.

[0060] Specifically, the displacement sensor can detect the moving distance of the moving seat, and then after the moving seat reaches the end of the flocculation tank 1 away from the drive motor 2, it sends a signal to the electric telescopic rod 8, so that the tightening rubber band 11 is removed from the surface of the frame 10.

[0061] Figure 12 The following is a method for pretreatment of underground saline-alkali agricultural water, comprising the following steps:

[0062] S1. Perform coarse filtration using disc filters, using 200-mesh discs to remove particles larger than 50μm from the water;

[0063] S2, flocculation treatment: The flocculant is mixed into the raw water after S1 treatment in real time by a proportional pump, so that the colloids in the raw water are fully flocculated in flocculation tank 1 and a sedimentation time of more than 2 hours is guaranteed. At the same time, the supernatant is sterilized by a nano-microbubble ozone generator to reduce the growth of microorganisms.

[0064] S3. Then, the supernatant after flocculation and sterilization in S2 is transferred to the secondary sedimentation tank and the sedimentation time is more than 2 hours to completely settle the remaining flocs.

[0065] S4. By using a booster pump, the supernatant in the secondary sedimentation tank is passed through quartz sand and activated carbon to further remove particulate matter in the water and adsorb colored and odorous organic matter.

[0066] S5. After S4 treatment, the water enters the PP cotton and Parke filter cartridges to remove all impurities larger than 1μm. The groundwater then undergoes desalination treatment and is transferred to a reservoir for storage as agricultural water, awaiting use.

[0067] S2 also includes the following working steps:

[0068] S21. First, put the flocculant into the flocculation tank 1, then start the lifting cylinder 5 and the stirring motor 4 to drive the stirring rod 6 down into the flocculation tank 1 and mix the flocculant and water in the flocculation tank 1.

[0069] S22. After stirring for the set time period, use the lifting cylinder 5 to lift the stirring rod 6 and turn off the stirring motor 4. At this time, let it stand for the specified time period and wait for flocculation and sedimentation.

[0070] S23. After a specified time period, there are flocculated materials on the bottom wall of the flocculation tank 1. At this time, the drive motor 2 is started at the set speed, which drives the moving seat to move slowly away from the drive motor 2, and then drives the frame 10 and the folded filter cover 9 to move horizontally in the flocculation tank 1, and collects the flocculated materials that have passed through into the folded filter cover 9.

[0071] S24. After the moving seat moves to the end of the ball screw 21 away from the drive motor 2, the drive motor 2 is turned off, the electric telescopic rod 8 is started, and the isolation rod 7 is moved towards the drive motor 2. The rightmost tightening rubber band 11 is also moved away from the surface of the frame 10. Under its own elasticity, the tightening rubber band 11 after being separated from the surface of the frame 10 retracts and locks the folded filter cover 9.

[0072] S25. Subsequently, under the action of the electric telescopic rod 8, the tightening rubber band 11 is driven to approach the end of the folded filter cover 9 away from the frame 10, and the end of the flocculent material collected in the folded filter cover 9 is tightened.

[0073] S26. Then retract the electric telescopic rod 8 so that the bottom end of the isolation rod 7 is back in the middle of the two tightening rubber bands 11 at the far right, and restart the drive motor 2 to drive the frame 10 and the folded filter cover 9 back to the end of the flocculation tank 1 near the drive motor 2, waiting for the next round of flocculant collection.

[0074] Second implementation method:

[0075] Figure 9-11 The extension rod 22 is shown to have symmetrically arranged servo motors embedded inside, and the output end of each servo motor is connected to a linkage rod 12. The tail end of the linkage rod 12 is connected to the top of the frame 10 through a connecting plate, and the servo motor is electrically connected to the drive motor 2 and the electric telescopic rod 8.

[0076] Specifically, when the frame 10 is about to approach the end of the flocculation tank 1 that is away from the drive motor 2 (at this time, there is a certain gap between the frame 10 and the inner wall of the flocculation tank 1 on the side away from the drive motor 2, this gap is used to make room for the frame 10 to make a small deflection later), the servo motor is started, which drives the linkage rod 12 to deflect to a certain extent, so that the frame 10 deflects synchronously and the bottom of the frame 10 can just contact the inner wall of the flocculation tank 1 on the side away from the drive motor 2. This allows the originally horizontally placed folded filter cover 9 to bend near the end of the frame 10, so that the flocculent material stored horizontally at the end can move towards the end of the folded filter cover 9 near the drive motor 2 under the action of gravity. Then the servo motor drives the linkage rod 12 to reset, at which point the frame 10 is reset. Then the electric telescopic rod 8 is started, which drives the isolation rod 7 to remove the tightening rubber band 11 from the surface of the frame 10 for corresponding locking and storage.

[0077] Unlike the first embodiment, this embodiment can move the flocs located inside the frame 10 during floc collection to the inside of the folded filter cover 9, thereby giving the invention a better storage effect.

[0078] The third implementation method:

[0079] Figure 13-14 The isolation rod 7 is shown to include a fixed rod body and a movable rod body that is movably sleeved on the outside of the fixed rod body. The fixed rod body is connected to the power end of the electric telescopic rod 8, and an electromagnet 71 is connected to the bottom end of the fixed rod body. An arc-shaped counterweight magnetic block is connected through the bottom of the movable rod body, and the counterweight magnetic block and the electromagnet 71 attract each other.

[0080] Specifically, when the isolation rod 7 returns to the surface of the frame 10, the electromagnet 71 is activated, which moves the counterweight magnetic block upward, thereby moving the movable rod at the lower position upward. This shortens the overall structure of the isolation rod 7, allowing it to be moved to the top of the frame 10 more easily. Then, when it moves to the middle of the two tightening elastic bands 11 at the far right, the electromagnet 71 is deactivated, and the rod falls to the surface of the frame 10 under the weight of the counterweight magnetic block and the movable rod itself, which helps the isolation rod 7 to achieve a better return.

[0081] Unlike the first embodiment, this embodiment adds an electromagnet 71 and replaces the arc-shaped part in the first embodiment with a counterweight magnetic block, thus improving the reset of the isolation rod 7.

[0082] In summary, this application utilizes the tightening rubber band 11, the isolation rod 7, the electric telescopic rod 8, and the folded filter cover 9 to separate and collect the flocs inside the flocculation tank 1 in batches. This avoids the need for subsequent stirring and mixing to disperse the settled flocs and also increases the liquid depth of the supernatant in the subsequent flocculation tank 1. Furthermore, it adopts an embedded integrated industrial design to integrate multiple filtration and sterilization pretreatment modules with the water ion desalination membrane, forming a modular integrated device with a small footprint and a throughput suitable for agricultural parks. It can also perform modular purification through a series connection of "head + subsystem" to meet the water supply needs of different agricultural parks.

[0083] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this invention.

Claims

1. A pretreatment device for underground saline-alkali agricultural water, comprising a flocculation tank (1), characterized in that: The outer wall of the flocculation tank (1) is equipped with symmetrically arranged stirring and mixing units. Vertical poles are installed at the center of the top on both sides of the flocculation tank (1). A drive motor (2) is installed on the surface of one of the vertical poles. A ball screw (21) is installed between the two vertical poles, and one end of the ball screw (21) is connected to the output end of the drive motor (2). A movable seat is threaded onto the surface of the ball screw (21). An extension rod (22) is connected to the bottom of the movable seat. A frame (10) is connected to the bottom of the extension rod (22), and the frame (10) slides in contact with the inner wall of the flocculation tank (1). Several equal-sized... The extension rod (22) is equipped with an electric telescopic rod (8) and the output end of the electric telescopic rod (8) is connected to a vertically arranged isolation rod (7). A folded filter cover (9) is connected to one side surface of the frame (10), and the diameter of the tightening rubber band (11) is less than one-tenth of the cross-sectional size of the folded filter cover (9). The bottom surface of the frame (10) is in close contact with the inner bottom wall of the flocculation tank (1). The folded filter cover (9) is made of filter cloth, and the mesh number of the filter cloth is not less than 300 mesh. The tail end of the folded filter cover (9) is connected to a frame plate made of elastic material, and the cross-section of the folded filter cover (9) is wavy. The bottom surface of the isolation rod (7) is equipped with protrusions arranged vertically, and the height difference between the two protrusions is greater than the ring diameter of the tightening elastic band (11). The lower protrusion is flush with the bottom surface of the isolation rod (7). The isolation rod (7) is a telescopic structure, and the bottom of the isolation rod (7) in its natural state is flush with the surface of the frame (10). The bottom part of the isolation rod (7) is arc-shaped.

2. The pretreatment device for underground saline-alkali agricultural water according to claim 1, characterized in that: When the power end of the electric telescopic rod (8) is in the retracted state, its projection in the vertical direction is located within the top surface of the frame (10), and the bottom of the isolation rod (7) is located in the middle of the two rightmost tightening rubber bands (11) in the initial state.

3. The pretreatment device for underground saline-alkali agricultural water according to claim 1, characterized in that: The mixing unit includes a support frame (3) installed on the outer walls of both sides of the flocculation tank (1), and the two support frames (3) are located at the front and rear ends of the drive motor (2). The top of the support frame (3) is equipped with a lifting cylinder (5) electrically connected to the drive motor (2). The output end of the lifting cylinder (5) is connected to a platform. The bottom of the platform is equipped with multiple stirring rods (6) through bearings, and the multiple stirring rods (6) at the bottom of each platform are connected by a conveyor belt. The top of the platform is equipped with a stirring motor (4), and the output end of the stirring motor (4) is connected to the end of one of the stirring rods (6).

4. The pretreatment device for underground saline-alkali agricultural water according to claim 3, characterized in that: The surface of the stirring rod (6) is equipped with stirring blades, and the shortest distance between two stirring blades on the same axis is greater than the diameter of the extension rod (22).

5. The pretreatment device for underground saline-alkali agricultural water according to claim 1, characterized in that: The movable seat is equipped with a displacement sensor, which is electrically connected to the electric telescopic rod (8).

6. The pretreatment device for underground saline-alkali agricultural water according to claim 1, characterized in that: The extension rod (22) is internally fitted with symmetrically arranged servo motors, and the output end of each servo motor is connected to a linkage rod (12). The tail end of the linkage rod (12) is connected to the top of the frame (10) through a connecting plate, and the servo motor is electrically connected to the drive motor (2) and the electric telescopic rod (8).

7. The pretreatment device for underground saline-alkali agricultural water according to claim 2, characterized in that: The isolation rod (7) includes a fixed rod body and a movable rod body that is movably sleeved on the outside of the fixed rod body. The fixed rod body is connected to the power end of the electric telescopic rod (8), and an electromagnet (71) is connected to the bottom end of the fixed rod body. An arc-shaped counterweight magnetic block is connected through the bottom of the movable rod body, and the counterweight magnetic block and the electromagnet (71) attract each other.

8. A method for pre-treatment of underground saline-alkali agricultural water, comprising the underground saline-alkali agricultural water pre-treatment device as described in any one of claims 1-7, characterized in that, The work includes the following steps: S1. Perform coarse filtration using disc filters, using 200-mesh discs to remove particles larger than 50μm from the water; S2, flocculation treatment: the flocculant is mixed into the raw water after S1 treatment in real time by a proportional pump, so that the colloids in the raw water are fully flocculated in the flocculation tank (1) and a sedimentation time of more than 2 hours is guaranteed. At the same time, the upper clear liquid is sterilized by a nano-microbubble ozone generator to reduce the reproduction of microorganisms. S3. Then, the supernatant after flocculation and sterilization in S2 is transferred to the secondary sedimentation tank and the sedimentation time is more than 2 hours to completely settle the remaining flocs. S4. By using a booster pump, the supernatant in the secondary sedimentation tank is passed through quartz sand and activated carbon to further remove particulate matter in the water and adsorb colored and odorous organic matter. S5. After S4 treatment, the water enters the PP cotton and Parke filter cartridges to remove all impurities larger than 1μm. The groundwater then undergoes desalination treatment and is transferred to a reservoir for storage as agricultural water, awaiting use.

9. A method for pretreatment of underground saline-alkali agricultural water according to claim 8, characterized in that, S2 also includes the following working steps: S21. First, put the flocculant into the flocculation tank (1), then start the lifting cylinder (5) and the stirring motor (4) to drive the stirring rod (6) down into the flocculation tank (1) and mix the flocculant and water in the flocculation tank (1); S22. After stirring for a set time period, use the lifting cylinder (5) to raise the stirring rod (6) and turn off the stirring motor (4). At this time, let it stand for a specified time period and wait for flocculation and sedimentation. S23. After a specified time period, there are flocculated materials on the bottom wall of the flocculation tank (1). At this time, the drive motor (2) is started at the set speed, which drives the moving seat to move slowly away from the drive motor (2), and then drives the frame (10) and the folded filter cover (9) to move horizontally in the flocculation tank (1) and collect the flocculated materials that have passed through into the folded filter cover (9). S24. After the moving seat moves to the end of the ball screw (21) away from the drive motor (2), the drive motor (2) is turned off, the electric telescopic rod (8) is started, and the isolation rod (7) is moved towards the drive motor (2), and the rightmost tightening elastic band (11) is disengaged from the surface of the frame (10). Under its own elasticity, the tightening elastic band (11) after being disengaged from the surface of the frame (10) retracts and locks the folded filter cover (9). S25. Then, under the action of the electric telescopic rod (8), the tightening rubber band (11) is driven to approach the end of the folded filter cover (9) away from the frame (10), and the flocculent material collected in the folded filter cover (9) is tightened at the end. S26. Then retract the electric telescopic rod (8) so that the bottom end of the isolation rod (7) is back in the middle of the two tightening rubber bands (11) at the far right end, and restart the drive motor (2) to drive the frame (10) and the folded filter cover (9) back to the end of the flocculation tank (1) near the drive motor (2) to wait for the next round of flocculent collection.

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