Heavy metal sewage treatment device and method for farmland irrigation

Abstract

The application discloses a heavy metal sewage treatment device and method for farmland irrigation, and relates to the technical field of heavy metal sewage treatment. The heavy metal sewage treatment device and method for farmland irrigation comprises a ring box, the ring box is connected with the side wall of a tank body, the ring box is communicated with a fan through a wind box, a membrane body is composed of an outer membrane and an inner membrane, the membrane body is in the shape of a circular truncated cone, the top of the membrane body is connected with a vibrating ball through a floating plate, a first air vibrator is arranged to drive the vibrating ball to vibrate in the vertical direction, and a second air vibrator is arranged to drive the vibrating ball to vibrate in the horizontal direction. The heavy metal sewage treatment device and method for farmland irrigation, by virtue of the fact that the inner membrane and the outer membrane are used to form a flexible circular truncated cone-shaped membrane body, a diffusion effect is formed, the movement and stretching of the membrane body are controlled through the action of buoyancy, and the effects and efficiency of backwashing are improved through the cooperation of air, vibration and water washing.

Description

Technical Field

[0001] This invention relates to the field of heavy metal wastewater treatment technology, specifically to a heavy metal wastewater treatment device and method for farmland irrigation. Background Technology

[0002] Industrial pollution emissions, mining and smelting, agricultural pollution itself, landfilling and incineration can all cause heavy metal content in farmland water to exceed standards. Untreated wastewater containing heavy metals used for farmland irrigation will cause heavy metals to accumulate in the soil, leading to soil degradation, reducing the sustainable use of land, and also causing toxic effects on crops. Through the food chain, it can pose a potential threat to human health. Therefore, it is necessary to treat heavy metals in farmland irrigation water in a timely manner.

[0003] Referring to Chinese Patent Publication No. CN118439768B, a high-recovery-rate reverse osmosis water treatment device includes a metal filter residue recovery box, support rods, and a solid-liquid separator. The solid-liquid separator is fixed to the top of the metal filter residue recovery box by the support rods. A water inlet component is fixedly installed on one side of the solid-liquid separator. When the first cleaning component alone cannot meet the cleaning requirements, the water flow thrust on the reverse osmosis filter component due to blockage will increase. When the water flow thrust on the reverse osmosis filter component increases to a certain value, the pressure switch will activate the impurity extraction module. The impurity extraction module can remove some impurities that cannot be scraped off from the surface of the reverse osmosis filter component. It is not necessary to temporarily shut down the reverse osmosis water treatment device to backwash the reverse osmosis filter component, and the purpose of quickly cleaning the reverse osmosis filter component can be achieved, which can effectively improve the recovery efficiency of heavy metals.

[0004] However, when the heavy metal content in farmland irrigation wastewater is high or even exceeds the standard, the treated heavy metals will remain on one side of the membrane. Backwashing is necessary to remove these residual impurities and ensure the membrane's continued operation. However, conventional membranes are mostly cylindrical metal frames that are difficult to deform. During backwashing, the scouring force of the water flow on the filter screen is relatively concentrated on the screen surface. For impurities attached deep within the screen or in corners, sufficient force may not be generated to remove them, easily leading to impurity residue. Water treatment devices, as the main equipment for field irrigation, are mostly electrically controlled and require autonomous operation to start and flush. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a heavy metal wastewater treatment device and method for farmland irrigation. The device uses an inner and outer membrane to form a flexible frustum-shaped membrane, creating a diffusion effect. Buoyancy is used to control the movement and stretching of the membrane. Pneumatic, vibration, and water washing work together to improve the effect and efficiency of backwashing.

[0006] Technical solution: To achieve the above objectives, the present invention is implemented through the following technical solution: a heavy metal wastewater treatment device for farmland irrigation, comprising: a tank, wherein the tank is connected to an inlet valve, a drain valve, a backwash pipe, and a sewage pipe, and a differential pressure detector is installed on one side of the tank.

[0007] The ring box is connected to the side wall of the bottom of the tank, and the top of the ring box is connected to several aeration heads. The ring box is connected to a blower through an air box.

[0008] The membrane body is connected at its bottom to the top of the ring box. The membrane body is composed of an outer membrane and an inner membrane. The membrane body is frustum-shaped. The top of the membrane body is connected to a vibrating ball via a floating plate.

[0009] A first air vibrator is located above the float plate and is configured to drive the vibrating ball to vibrate in the vertical direction. A second air vibrator is located below the first air vibrator and is configured to drive the vibrating ball to vibrate in the horizontal direction.

[0010] Preferably, an inner membrane is connected to the inner side of the outer membrane, the inner membrane is adapted to the outer membrane, a hole is opened through the side of the inner membrane and one end of the hole extends through the side of the outer membrane, the top of the float plate is connected to the vibrating ball through a connecting rod, a shift ring is connected to the side of the float plate through an elastic connecting piece, a buffer ring is connected to the inner wall of the shift ring, a limit rod is connected to the top wall of the tank, the limit rod is slidably connected to the buffer ring, and a baffle is connected to the bottom of the limit rod.

[0011] Preferably, the projection of the top of the elastic connecting piece is a near-isosceles trapezoid, the elastic connecting piece is made of rubber, the outer membrane is made of metal, and the inner membrane is made of polymer material.

[0012] Preferably, a plurality of aeration heads are equidistantly distributed along the circumference of the annular box. The bottom of the annular box is connected to a pipe, the bottom end of which extends out of the tank and connects to the air box. The inner cavity of the air box is divided into a first cavity and a second cavity. One side of the first cavity is connected to the pipe, and the other side of the first cavity is connected to the air outlet of the blower. The second cavity is connected to the air inlet pipe. A hydraulic cylinder is provided above the air box. The telescopic end of the hydraulic cylinder is connected to a sealing plate, and the fixed end of the hydraulic cylinder is connected to the side of the tank. The sealing plate is used to connect or isolate the first cavity and the second cavity under telescopic action.

[0013] Preferably, the second air vibrator is installed on the outside of the tank, and the second rod of the second air vibrator passes through the side wall of the tank and extends into the tank. The first air vibrator is installed on the top of the tank, and the bottom end of the first rod of the first air vibrator passes through the top wall of the tank and extends into the tank. A sealing buffer ring is installed at the connection between the first rod and the tank. One end of the first rod and the second rod both pass through the sealing buffer ring and extend into the tank. The second air vibrator is connected to a first connecting plate through the second rod. A first vibrating plate is connected to the edges of both ends of the first connecting plate. The first air vibrator is connected to a second connecting plate through the first rod. An upper vibrating plate and a lower vibrating plate are connected to the edges of both ends of the second connecting plate.

[0014] Preferably, the bottom of the lower vibrating plate has a through hole with a diameter larger than that of the connecting rod. The top of the connecting rod passes through the hole and is connected to the vibrating ball. The top of the second connecting plate has an opening. The thickness of the upper vibrating plate is greater than that of the lower vibrating plate, and the length of the upper vibrating plate is less than that of the lower vibrating plate.

[0015] Preferably, the upper vibrating plate has an air cavity inside, and a sliding groove is formed on the side of the upper vibrating plate away from the second connecting plate, which is connected to the air cavity. An air hole is formed on the side of the upper vibrating plate near the second connecting plate and is connected to the air cavity. The air hole is connected to the second cavity through an air inlet pipe. A push plate is slidably connected to the air cavity. An extension plate is connected to the side of the push plate away from the second connecting plate. The extension plate is slidably connected to the sliding groove. The side of the push plate near the second connecting plate is connected to the inner wall of the air hole through several springs.

[0016] Preferably, when the air chamber is not inflated, the side of the extension plate away from the second connecting plate and the side of the upper vibrating plate away from the second connecting plate are on the same plane, and the vibrating ball does not contact the upper vibrating plate during movement. When the extension plate is fully extended, the side of the extension plate away from the second connecting plate and the side of the lower vibrating plate away from the second connecting plate are on the same plane.

[0017] One method includes a heavy metal wastewater treatment device for farmland irrigation. The inlet valve, outlet valve, backwash valve, sewage discharge valve, and differential pressure detector are all electrically connected to the controller via a single wire. The differential pressure detector measures the pressure difference across the membrane in real time. When the pressure difference reaches a warning threshold, backwashing is initiated. The membrane treatment operates in three modes: the first mode inputs filtered water into the underground irrigation network; the automatic filtration mode uses the intelligent control core controller to obtain backwash signals through data analysis and performs joint calculations based on relevant data from the inlet, sewage discharge, and water quality sensors to complete filter cleaning; and the time-based mode uses the control core controller to record operating time and automatically initiates the backwashing process after a certain period.

[0018] Beneficial Effects: This invention provides a heavy metal wastewater treatment device and method for farmland irrigation. Compared with the prior art, it has the following beneficial effects: 1. The device consists of an inner membrane and an outer membrane. The outer membrane is made of metal, and the inner membrane is made of polymer material. The outer membrane provides a supporting foundation for the membrane and is located on the outside, ensuring the stability and impact resistance of the membrane. The inner membrane provides flexibility to the membrane. The movement and stretching of the membrane are controlled by buoyancy, allowing the vibrating ball to move between the first and second air vibrators. This facilitates the separate control of the membrane's vibration in the horizontal and vertical directions. Furthermore, the pneumatic, vibration, and water washing functions work together to improve the effect and efficiency of backwashing.

[0019] 2. The membrane is truncated cone-shaped. As water flows from the smaller end to the larger end of the cone, the cross-sectional area gradually increases and the flow velocity gradually decreases. According to fluid mechanics principles, this change in flow pattern produces a diffusion-like effect, making it easier for impurities to move towards the larger end under the influence of the water flow, thus facilitating their discharge. Especially for particulate impurities commonly found in heavy metal filtration, the conical filter effectively prevents impurities from accumulating locally on the filter, reducing filter clogging caused by impurity buildup.

[0020] 3. The wind generated by the blower is not only used for aeration, but also provides power for the movement of the push plate and controls the movement of the extension plate. When the extension plate is not extended, it will not hinder the upward movement of the vibrating ball. When the extension plate is extended, it is convenient for the extension plate and the lower vibrating plate to drive the vibrating ball to vibrate in the vertical direction.

[0021] 4. The combined use of air flushing, water flushing, and vibration: Air flushing creates turbulent water flow, applying horizontal and vertical forces to impurities, thus loosening them. Vibration, through mechanical force, causes high-frequency vibrations in the filter screen, directly acting on the impurities and further breaking down the adhesion between the impurities and the filter screen, making it easier for heavy metal impurities to detach. Water flushing provides direct rinsing power, carrying away loosened impurities, and the pressure of the water flush also washes away impurities on the filter screen. Combined with air flushing and vibration, these techniques apply forces to impurities from different directions, making it easier for impurities to detach from the pores and surface of the filter screen. This enhances the loosening effect of impurities, improves rinsing uniformity, optimizes water flow, and extends the service life of the filter screen. Attached Figure Description

[0022] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present application and, together with the specification, further serve to explain the principles of the present application and enable those skilled in the art to implement and use the present application.

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the present invention.

[0025] Figure 2 for Figure 1 A cross-sectional view.

[0026] Figure 3 This is a diagram showing the separation of the tank body and its internal structure.

[0027] Figure 4 This is a schematic diagram of the internal structure of the tank.

[0028] Figure 5 This is a separation diagram of the portion containing the outer membrane, the portion containing the first air vibrator, and the portion containing the ring box.

[0029] Figure 6 This is a schematic diagram of the structure of the part where the outer membrane is located.

[0030] Figure 7 This is a structural diagram of the outer membrane, inner membrane, float plate, and vibrating ball.

[0031] Figure 8 This is a structural diagram of the part where the floating plate is located.

[0032] Figure 9 This is a structural diagram of the part where the ring box is located.

[0033] Figure 10 This is a structural diagram of the air box and sealing plate.

[0034] Figure 11 This is a schematic diagram of the structure of the part where the first air vibrator is located.

[0035] Figure 12 for Figure 11 A schematic diagram of the structure after the intake pipe has been removed.

[0036] Figure 13 This is a structural diagram of the lower vibrating plate, the upper vibrating plate, and the second connecting plate.

[0037] Figure 14 This is a separate diagram of the upper vibrating plate and its internal structure.

[0038] The attached figures are labeled as follows: 11. Tank; 12. Inlet valve; 13. Drain valve; 14. Backflush pipe; 15. Sewage pipe; 16. Differential pressure detector; 21. Outer membrane; 22. Inner membrane; 23. Orifice; 24. Float; 25. Vibrating ball; 26. Elastic connecting piece; 27. Shifting ring; 28. Buffer ring; 29. ​​Limiting rod; 31. Connecting rod; 32. Baffle; 41. Fan; 42. Air box; 43. First chamber; 44. Second chamber; 45. Hydraulic cylinder; 46. Pipe 47. Ring box; 48. Aeration head; 49. Sealing plate; 51. Air inlet pipe; 52. First rod; a. Second rod; 53. First air vibrator; 54. Second air vibrator; 55. Sealing buffer ring; 56. First connecting plate; 57. First vibrating plate; 58. Second connecting plate; 61. Lower vibrating plate; 62. Round hole; 63. Upper vibrating plate; 64. Spring; 65. Push plate; 66. Extension plate; 71. Mouth; 72. Air hole; 73. Air chamber; 74. Slide groove.

[0039] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] like Figure 1 - Figure 14 As shown, an embodiment of the present invention provides a heavy metal wastewater treatment device for farmland irrigation, comprising: a tank 11, the tank 11 being connected to an inlet valve 12, a drain valve 13, a backflushing pipe 14, and a sewage pipe 15, and a differential pressure detector 16 being installed on one side of the tank 11.

[0042] The ring box 47 is connected to the side wall of the bottom of the tank 11. Several aeration heads 48 are connected to the top of the ring box 47. The ring box 47 is connected to a blower 41 through the air box 42.

[0043] The membrane body is connected at the bottom to the top of the ring box 47. The membrane body is composed of an outer membrane 21 and an inner membrane 22. The membrane body is frustum-shaped. The top of the membrane body is connected to a vibrating ball 25 through a floating plate 24.

[0044] The membrane is truncated cone-shaped. As water flows from the smaller end to the larger end of the cone, the cross-sectional area gradually increases and the flow velocity gradually decreases. According to fluid mechanics principles, this change in flow pattern produces a diffusion-like effect, making it easier for impurities to move towards the larger end under the influence of the water flow, thus facilitating their discharge. Especially for particulate impurities commonly found in heavy metal filtration, the conical filter effectively prevents impurities from accumulating locally on the filter, reducing filter clogging caused by impurity buildup. The cylindrical filter has a relatively uniform cross-section of the water flow channel. During backwashing, the scouring force of the water flow on the filter is relatively concentrated on the filter surface. For impurities attached deep within the filter or in corners, it may not generate sufficient force to remove them, easily resulting in impurity residue. Due to the special shape of the truncated cone, the backwash water flow from the smaller end to the larger end forms a natural diffusion flow field, allowing the water flow to be more evenly distributed on the filter, providing a more balanced scouring of the entire filter surface, thereby improving the uniformity of the backwashing effect. Backwash water for cylindrical filters typically enters evenly from one side or around the perimeter. However, inside the filter, the water flow can be affected by the filter structure and flow resistance, leading to differences in backwash intensity between the center and edges, making completely uniform backwashing difficult. Conical structures, on the other hand, offer better mechanical stability, withstanding greater water flow impact during backwashing without easily deforming. This is crucial for ensuring filtration accuracy and backwashing effectiveness, especially when treating high-pressure, high-flow-rate heavy metal wastewater, where conical filters better maintain their shape and performance. When subjected to the impact of backwash water, particularly when the filter is tall or the water flow force is strong, cylindrical filters may experience localized deformation or swaying. This not only affects filtration efficiency but can also lead to uneven backwash water distribution, further reducing backwashing efficiency.

[0045] The first air vibrator 53 is located above the float 24. The first air vibrator 53 is configured to drive the vibrating ball 25 to vibrate in the vertical direction. The second air vibrator 54 is located below the first air vibrator 53. The second air vibrator 54 is configured to drive the vibrating ball 25 to vibrate in the horizontal direction.

[0046] An inner membrane 22 is connected to the inner side of the outer membrane 21. The inner membrane 22 is adapted to the outer membrane. A hole 23 is opened through the side of the inner membrane 22, and one end of the hole 23 extends through the side of the outer membrane. The top of the float plate 24 is connected to the vibrating ball 25 through the connecting rod 31. A shift ring 27 is connected to the side of the float plate 24 through the elastic connecting piece 26. A buffer ring 28 is connected to the inner wall of the shift ring 27. A limit rod 29 is connected to the top wall of the tank body 11. The limit rod 29 is slidably connected to the buffer ring 28. A baffle 32 is connected to the bottom of the limit rod 29.

[0047] The top projection of the elastic connecting piece 26 is a near-isosceles trapezoid. The elastic connecting piece 26 is made of rubber, the outer membrane 21 is made of metal, and the inner membrane 22 is made of polymer material.

[0048] The outer membrane 21 is made of stainless steel fiber, while the inner membrane 22 is made of polypropylene and polytetrafluoroethylene polymer materials. The stainless steel fiber possesses high strength, good corrosion resistance, and high-temperature resistance, providing basic structural support and stable filtration performance for the membrane. The polymer materials endow the membrane with flexibility and good chemical stability. During backwashing, the stainless steel fiber ensures that the filter screen does not easily deform under water flow impact, maintaining the shape and structural integrity of the membrane. The flexibility of the polymer materials allows the membrane to bend and deform to a certain extent, helping to remove impurities adhering to the filter screen and preventing impurity residue.

[0049] Several aeration heads 48 are equidistantly distributed along the circumference of the ring box 47. The bottom of the ring box 47 is connected to a pipe 46. The bottom end of the pipe 46 extends out of the tank body 11 and is connected to the air box 42. The inner cavity of the air box 42 is divided into a first cavity 43 and a second cavity 44. One side of the first cavity 43 is connected to the pipe 46, and the other side of the first cavity 43 is connected to the air outlet of the blower 41. The second cavity 44 is connected to the air inlet pipe 51. A hydraulic cylinder 45 is installed above the air box 42. The telescopic end of the hydraulic cylinder 45 is connected to a sealing plate 49. The fixed end of the hydraulic cylinder 45 is connected to the side of the tank body 11. The sealing plate 49 is used to connect or isolate the first cavity 43 and the second cavity 44 under the telescopic action.

[0050] The second air vibrator 54 is installed on the outside of the tank 11. The second rod a of the second air vibrator 54 passes through the side wall of the tank 11 and extends into the tank 11. The first air vibrator 53 is installed on the top of the tank 11. The bottom end of the first rod 52 of the first air vibrator 53 passes through the top wall of the tank 11 and extends into the tank 11. A sealing buffer ring 55 is installed at the connection between the first rod 52 and the tank 11. One end of the first rod 52 and the second rod a passes through the sealing buffer ring 55 and extends into the tank 11. The second air vibrator 54 is connected to the first connecting plate 56 through the second rod a. The edges of both ends of the first connecting plate 56 are connected to the first vibrating plate 57. The first air vibrator 53 is connected to the second connecting plate 58 through the first rod 52. The edges of both ends of the second connecting plate 58 are connected to the upper vibrating plate 63 and the lower vibrating plate 61.

[0051] The bottom of the lower vibrating plate 61 has a through hole 62, the diameter of which is larger than the diameter of the connecting rod 31. The top of the connecting rod 31 passes through the hole 62 and is connected to the vibrating ball 25. The top of the second connecting plate 58 has an opening 71. The thickness of the upper vibrating plate 63 is greater than that of the lower vibrating plate 61, and the length of the upper vibrating plate 63 is less than that of the lower vibrating plate 61.

[0052] An air cavity 73 is provided inside the upper vibrating plate 63. A sliding groove 74 is provided on the side of the upper vibrating plate 63 away from the second connecting plate 58, and the sliding groove 74 is connected to the air cavity 73. An air hole 72 is provided on the side of the upper vibrating plate 63 near the second connecting plate 58, and the air hole 72 is connected to the air cavity 73. The air hole 72 is connected to the second cavity 44 through an air inlet pipe 51. A push plate 65 is slidably connected to the air cavity 73. An extension plate 66 is connected to the side of the push plate 65 away from the second connecting plate 58. The extension plate 66 is slidably connected to the sliding groove 74. The side of the push plate 65 near the second connecting plate 58 is connected to the inner wall of the air hole 72 through several springs 64.

[0053] When the air chamber 73 is not inflated, the side of the extension plate 66 away from the second connecting plate 58 and the side of the upper vibrating plate 63 away from the second connecting plate 58 are on the same plane. The vibrating ball 25 does not contact the upper vibrating plate 63 during movement. When the extension plate 66 is fully extended, the side of the extension plate 66 away from the second connecting plate 58 and the side of the lower vibrating plate 61 away from the second connecting plate 58 are on the same plane.

[0054] A method includes a heavy metal wastewater treatment device for farmland irrigation. An inlet valve 12, an outlet valve 13, a backwash valve, a sewage discharge valve, and a differential pressure detector 16 are all electrically connected to a controller via a single wire. The differential pressure detector 16 measures the pressure difference across the membrane in real time. When the pressure difference reaches a warning threshold, backwashing is initiated. The device operates in three modes: a normal mode for routine water filtration followed by inputting the filtered water into the underground irrigation network; an automatic filtration mode where the intelligent control core controller obtains backwashing signals through data analysis and performs joint calculations based on data from the inlet, sewage discharge, and water quality sensors to clean the filter element; and a time-based mode where the control core controller records the operating time and automatically initiates the backwashing process after a certain period.

[0055] During use, the differential pressure detector 16 measures the pressure difference across the membrane in real time. When the pressure difference across the membrane reaches the warning threshold, backwashing is initiated.

[0056] The blower 41 and the second air vibrator 54 can be started. The air from the blower 41 enters the first chamber 43, the pipe 46, the ring box 47, and the aeration head 48 in sequence. The aeration head 48 disperses the gas into the tank 11. The gas moves upward from the bottom of the tank 11. The bubbles formed by the gas will cause turbulence and stirring of the water flow during the rising process, increasing the shearing and scouring force of the water flow on the impurities, loosening the impurities attached to the filter media or filter element, and exposing some impurities hidden in the gaps between the filter media or inside the filter element. At this time, the vibrating ball 25 is at its highest point, and the membrane is fully stretched in the vertical direction. The vibrating ball 25 is located between the two first vibrating plates 57. The second air vibrator 54 is started, and the first vibrating plates 57 vibrate the vibrating ball 25 in the horizontal direction. The horizontal vibration can cause the impurities on the filter screen to be displaced in the horizontal direction, breaking the static state of the impurities on the filter screen and making it easier for them to detach from the gaps 23 of the filter screen. For impurities that adhere laterally to the filter screen during the filtration process, horizontal vibration can directly push them towards the edge of the filter screen or the direction of water flow, making them easier to be washed away by the water flow laterally. Horizontal vibration can also make impurities more evenly distributed on the filter screen, avoiding excessive accumulation of impurities in local areas. In this way, during backwashing, the water flow can act more evenly on all parts of the filter screen, improving the backwashing effect and reducing the possibility of incomplete rinsing in some areas due to uneven impurity distribution. Then, the second air vibrator 54 is turned off.

[0057] Open the valves of backwash pipe 14 and drain pipe 15, and water flows down from the top of tank 11, allowing air and water to act simultaneously in the filter layer. The air bubbles, as they rise, cause turbulence and agitation in the water flow, increasing the shearing and scouring force on impurities. Simultaneously, the backwash water provides a medium for carrying and discharging impurities. This simultaneous air-water action allows for faster removal of impurities from the filter media or filter element surface.

[0058] The valve of the backflushing pipe 14 can be closed, and the valve of the drain pipe 15 closes after a period of time. The water level in the tank 11 drops, the buoyancy of the float 24 decreases, and the float 24 moves down with the vibrating ball 25. At this time, the vibrating ball 25 is located between the upper vibrating plate 63 and the lower vibrating plate 61. The membrane is no longer fully stretched by the float 24. The inner membrane 22 of the membrane is a high molecular polymer, and the membrane has good flexibility, which facilitates small-amplitude vibration of the membrane in the vertical direction.

[0059] Next, the hydraulic cylinder 45 and the blower 41 are started. The extension end of the hydraulic cylinder 45 moves upward with the sealing plate 49. The first chamber 43 and the second chamber 44 are no longer separated by the sealing plate 49. The bottoms of the first chamber 43 and the second chamber 44 are connected. The air enters the first chamber 43, the second chamber 44, the pipe 46, the ring box 47, the aeration head 48, the air inlet pipe 51, the air hole 72, and the air chamber 73 in sequence from the air outlet of the blower 41. The aeration head 48 disperses the gas into the tank 11. Air enters the air chamber 73, increasing the gas volume and pressure on the push plate 65. The push plate 65, carrying the extension plate 66, moves away from the second connecting plate 58, stretching the spring 64. Finally, the extension plate 66 fully extends from the slide groove 74. At this point, the side of the extension plate 66 away from the second connecting plate 58 is on the same plane as the side of the lower vibrating plate 61 away from the second connecting plate 58. The extension plate 66 increases the length of the upper vibrating plate 63, activating the first air vibrator 53. The first air vibrator 53, through the upper vibrating plate 63, extension plate 66, and lower vibrating plate 61, drives the vibrating ball 25. The vibrating ball 25 vibrates vertically. This vertical vibration subjects impurities attached to the filter screen to a force perpendicular to the filter screen surface. This force helps overcome the adhesion between the impurities and the filter screen, making it easier for the impurities to detach. Especially for fine particles tightly attached to the filter screen pores 23 or its surface, the vertical vibration can shake these impurities off through instantaneous impact, thereby improving the cleanliness of the filter screen. It also allows the pores of the filter screen to expand and contract instantaneously during vibration, which helps water flow more smoothly through the filter screen and improves the penetration efficiency of backwash water. This allows the backwash water to better reach the deeper parts of the filter screen, washing out the impurities hidden inside, which is very beneficial for improving the deep filtration effect of the filter screen and extending its service life.

[0060] Turn off the first air vibrator 53, open the valves of the backflush pipe 14 and the drain pipe 15 to flush out the impurities inside the membrane body.

[0061] Backwashing can also be performed simultaneously with the vibration of the first air vibrator 53 and the second air vibrator 54. The air flushing, water flushing, and vibration work together. The air flushing causes the water to flow turbulently, and the impurities are subjected to horizontal and vertical forces, thus loosening the impurities. The vibration causes the filter screen to vibrate at high frequency through mechanical force, which directly acts on the impurities on the filter screen, further breaking the adhesion between the impurities and the filter screen, making it easier for heavy metal impurities to fall off. The water flushing provides direct flushing power, and the water flow can carry away the loosened impurities. The pressure of the water flushing can also wash away the impurities on the filter screen. In combination with the air flushing and vibration, forces can be applied to the impurities from different directions, making it easier for the impurities to fall off from the pores 23 and the surface of the filter screen. This has the benefits of enhancing the loosening effect of impurities, improving the uniformity of flushing, optimizing the water flow state, and extending the service life of the filter screen.

[0062] The wind generated by the blower 41 is not only used for aeration, but also provides power for the movement of the push plate 65 and controls the movement of the extension plate 66. When the extension plate 66 is not extended, it will not hinder the upward movement of the vibrating ball 25. When the extension plate 66 is extended, it is convenient for the extension plate 66 and the lower vibrating plate 61 to drive the vibrating ball 25 to vibrate in the vertical direction.

[0063] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details have been described in detail in the above preferred embodiments; however, those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits have not been described in detail.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A heavy metal wastewater treatment device for farmland irrigation, characterized in that, include: Tank (11), the tank (11) is connected to an inlet valve (12), a drain valve (13), a backflush pipe (14), and a sewage pipe (15), and a differential pressure detector (16) is installed on one side of the tank (11). The ring box (47) is connected to the side wall of the bottom end of the tank body (11) on its side. The top of the ring box (47) is connected to several aeration heads (48). The ring box (47) is connected to a blower (41) through a wind box (42). The membrane body is connected at the bottom to the top of the ring box (47). The membrane body is composed of an outer membrane (21) and an inner membrane (22). The membrane body is frustum-shaped. The top of the membrane body is connected to a vibrating ball (25) through a floating plate (24). The first air vibrator (53) is located above the float (24). The first air vibrator (53) is configured to drive the vibrating ball (25) to vibrate in the vertical direction. A second air vibrator (54) is provided on one side of the tank (11). The second air vibrator (54) is configured to drive the vibrating ball (25) to vibrate in the horizontal direction. The second air vibrator (54) is installed on the outside of the tank (11). The second rod (a) of the second air vibrator (54) passes through the side wall of the tank (11) and extends into the tank (11). The first air vibrator (53) is installed on the top of the tank (11). The bottom end of the first rod (52) of the first air vibrator (53) passes through the top wall of the tank (11) and extends into the tank (11). Sealing buffer rings (55) are installed at the connection between the first rod (52) and the tank (11). One end of the first rod (52) and the second rod (a) both pass through the sealing buffer ring (55) and extend into the tank (11). The second air vibrator (54) is connected to the first connecting plate (56) through the second rod (a). The edges of both ends of the first connecting plate (56) are connected to the first vibrating plate (57). The first air vibrator (53) is connected to the second connecting plate (58) through the first rod (52). The edges of both ends of the second connecting plate (58) are connected to the upper vibrating plate (63) and the lower vibrating plate (61).

2. The heavy metal wastewater treatment device for farmland irrigation according to claim 1, characterized in that: The inner side of the outer membrane (21) is connected to the inner membrane (22), which is adapted to the outer membrane (21). The side of the inner membrane (22) is provided with a hole (23), and one end of the hole (23) extends through and penetrates the side of the outer membrane (21). The top of the float (24) is connected to the vibrating ball (25) through the connecting rod (31). The side of the float (24) is connected to the shifting ring (27) through the elastic connecting piece (26). The inner wall of the shifting ring (27) is connected to the buffer ring (28). The top wall of the tank (11) is connected to the limiting rod (29), which is slidably connected to the buffer ring (28). The bottom of the limiting rod (29) is connected to the baffle (32).

3. The heavy metal wastewater treatment device for farmland irrigation according to claim 2, characterized in that: The top projection of the elastic connecting piece (26) is a near-isosceles trapezoid. The elastic connecting piece (26) is made of rubber, the outer membrane (21) is made of metal, and the inner membrane (22) is made of polymer.

4. The heavy metal wastewater treatment device for farmland irrigation according to claim 1, characterized in that: Several aeration heads (48) are equidistantly distributed along the circumference of the ring box (47). The bottom of the ring box (47) is connected to a pipe (46). The bottom end of the pipe (46) extends out of the tank (11) and is connected to the air box (42). The inner cavity of the air box (42) is divided into a first cavity (43) and a second cavity (44). One side of the first cavity (43) is connected to the pipe (46), and the other side of the first cavity (43) is connected to the air outlet of the blower (41). The second cavity (44) is connected to the air inlet pipe (51). A hydraulic cylinder (45) is provided above the air box (42). The telescopic end of the hydraulic cylinder (45) is connected to a sealing plate (49). The fixed end of the hydraulic cylinder (45) is connected to the side of the tank (11). The sealing plate (49) is used to connect or isolate the first cavity (43) and the second cavity (44) under the telescopic action of the hydraulic cylinder (45).

5. The heavy metal wastewater treatment device for farmland irrigation according to claim 1, characterized in that: The bottom of the lower vibrating plate (61) has a through hole (62) with a diameter greater than that of the connecting rod (31). The top of the connecting rod (31) passes through the hole (62) and is connected to the vibrating ball (25). The top of the second connecting plate (58) has an opening (71). The thickness of the upper vibrating plate (63) is greater than that of the lower vibrating plate (61), and the length of the upper vibrating plate (63) is less than that of the lower vibrating plate (61).

6. The heavy metal wastewater treatment device for farmland irrigation according to claim 1, characterized in that: An air chamber (73) is provided inside the upper vibrating plate (63). A sliding groove (74) is provided on the side of the upper vibrating plate (63) away from the second connecting plate (58). The sliding groove (74) is connected to the air chamber (73). An air hole (72) is provided on the side of the upper vibrating plate (63) close to the second connecting plate (58) and is connected to the air chamber (73). The air hole (72) is connected to the second cavity (44) through an air inlet pipe (51). A push plate (65) is slidably connected to the air chamber (73). An extension plate (66) is connected to the side of the push plate (65) away from the second connecting plate (58). The extension plate (66) is slidably connected to the sliding groove (74). The side of the push plate (65) close to the second connecting plate (58) is connected to the inner wall of the air chamber (73) close to the air hole (72) through several springs (64).

7. The heavy metal wastewater treatment device for farmland irrigation according to claim 6, characterized in that: When the air chamber (73) is not inflated, the side of the extension plate (66) away from the second connecting plate (58) and the side of the upper vibrating plate (63) away from the second connecting plate (58) are on the same plane. The vibrating ball (25) does not contact the upper vibrating plate (63) during movement. When the extension plate (66) is fully extended, the side of the extension plate (66) away from the second connecting plate (58) and the side of the lower vibrating plate (61) away from the second connecting plate (58) are on the same plane.

8. A method for treating heavy metal wastewater for farmland irrigation, comprising the heavy metal wastewater treatment device for farmland irrigation according to any one of claims 1-7, characterized in that: The inlet valve (12), drain valve (13), backwash valve, sewage valve, and differential pressure detector (16) are all electrically connected to the controller via wires. The differential pressure detector (16) measures the pressure difference across the membrane in real time. When the pressure difference across the membrane reaches the warning threshold, backwashing is initiated. There are three modes for membrane treatment: the first mode is to input the filtered water into the underground irrigation network; the automatic filtration mode is to obtain the backwash signal through data analysis by the controller, and to perform joint calculations by controlling the relevant data of the inlet, sewage, and differential pressure detector (16) to complete the membrane cleaning; the time-period mode is to record the running time by the controller and automatically start the backwashing process after a certain time.

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