Heavy metal sewage treatment device and method for farm irrigation

Abstract

The invention discloses a heavy metal sewage treatment device and method for farm irrigation, and relates to the technical field of heavy metal sewage treatment. The heavy metal sewage treatment device for farm 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 an air box, a membrane body is composed of an outer membrane and an inner membrane and is in a circular truncated cone shape, the top of the membrane body is connected with a vibration ball through a floating plate, and a first air vibrator is arranged to drive the vibration ball to vibrate in the vertical direction; the second air vibrator is arranged to drive the vibration ball to vibrate in the horizontal direction. According to the heavy metal sewage treatment device and method for farm irrigation, the inner membrane and the outer membrane form a circular truncated cone-shaped membrane body with flexibility, a diffusion effect is formed, movement and stretching of the membrane body are controlled through the buoyancy effect, pneumatic operation, vibration and water washing are matched with one another, and the backwashing effect and efficiency are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heavy metal sewage treatment, in particular to a heavy metal sewage treatment device and method for farmland irrigation. BACKGROUND

[0002] Industrial pollution emissions, mining and smelting, agricultural pollution, landfill and incineration can all cause the heavy metal content of farmland water to exceed the standard. If untreated heavy metal sewage is used for farmland irrigation, heavy metals will accumulate in the soil, causing soil degradation, reducing the sustainability of the land, and also causing toxic effects on crops, which can be transmitted through the food chain and pose a potential threat to human health. Therefore, the heavy metals in farmland irrigation water need to be treated 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 tank, a support rod member, and a solid-liquid separator. The solid-liquid separator is fixed on the top of the metal filter residue recovery tank through the support rod member. A water inlet assembly is fixed on one side of the solid-liquid separator. When the first cleaning assembly alone cannot meet the cleaning requirements, the water flow thrust on the reverse osmosis filter assembly will increase due to blockage. When the water flow thrust on the reverse osmosis filter assembly increases to a certain value, the pressure switch will be linked to open the impurity extraction module. The impurity extraction module can suck away some impurities that cannot be scraped off on the surface of the reverse osmosis filter assembly. Temporary shutdown of the reverse osmosis water treatment device is not required for backwashing of the reverse osmosis filter assembly. The purpose of quickly cleaning the reverse osmosis filter assembly can be achieved, and the recovery efficiency of heavy metals can be effectively improved.

[0004] However, when the heavy metal content in the sewage for farmland irrigation is high or even exceeds the standard, the treated heavy metals will remain on one side of the membrane body. The impurities remaining on the membrane body need to be removed through backwashing to ensure the continuous working capacity of the membrane body. However, conventional membrane bodies are mostly cylindrical metal skeletons, and the membrane body is difficult to deform. During the backwashing process, the scouring force of the water flow on the impurities on the filter screen is relatively concentrated on the surface of the filter screen. For some impurities attached to the deep or corner of the filter screen, the force may not be sufficient to make them discharge, which can easily cause impurities to remain. The water quality treatment device is the main equipment for field irrigation, and is mostly an electric control device that needs to be operated independently to start the flushing. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a heavy metal sewage treatment device and method for farmland irrigation. The inner membrane and the outer membrane form a flexible frustoconical membrane body, which forms a diffusion effect. The movement and stretching of the membrane body are controlled by the buoyancy effect. The air, vibration, and water washing are mutually coordinated to improve the effect and efficiency of backwashing.

[0006] Technical solution: To achieve the above object, the application is implemented by the following technical solutions: a heavy metal sewage treatment device for farmland irrigation, comprising: a tank body, the tank body is communicated with a water inlet valve, a drain valve, a backflush pipe and a blowdown pipe, and a differential pressure detector is installed on one side of the tank body.

[0007] A ring box is connected with the side wall of the bottom end of the tank body, and a plurality of aeration heads are communicated with the top of the ring box, and the ring box is communicated with a fan through a wind box.

[0008] A membrane body is connected with the top of the ring box, the membrane body is composed of an outer membrane and an inner membrane, the membrane body is a circular truncated cone, and the top of the membrane body is connected with a vibrating ball through a floating plate.

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

[0010] Preferably, the inner side of the outer membrane is connected with an inner membrane, the inner membrane is matched with the outer membrane, the side surface of the inner membrane is provided with a hole, and one end of the hole extends through the side surface of the outer membrane, the top of the floating plate is connected with the vibrating ball through a connecting rod, the side surface of the floating plate is connected with a moving ring through an elastic connecting piece, the inner wall of the moving ring is connected with a buffer ring, the top wall of the tank body is connected with a limiting rod, the limiting rod is slidingly connected with the buffer ring, and the bottom of the limiting rod is connected with a baffle.

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

[0012] Preferably, the plurality of aeration heads are equidistantly distributed in the circumferential direction of the ring box, the bottom of the ring box is communicated with a pipeline, the bottom end of the pipeline extends out of the tank body and is communicated with the wind box, the inner cavity of the wind box is divided into a first cavity and a second cavity, one side of the first cavity is communicated with the pipeline, the other side of the first cavity is communicated with the air outlet of the fan, the second cavity is communicated with an air inlet pipe, a hydraulic cylinder is arranged above the wind box, the telescopic end of the hydraulic cylinder is connected with a sealing plate, the fixed end of the hydraulic cylinder is connected with the side surface of the tank body, and the sealing plate is used to communicate or isolate the first cavity and the second cavity under the telescopic action.

[0013] Preferably, the second air vibrator is mounted on the outside of the tank body, the rod of the second air vibrator penetrates through the side wall of the tank body and extends into the tank body, the first air vibrator is mounted on the top of the tank body, the bottom end of the rod of the first air vibrator penetrates through the top wall of the tank body and extends into the tank body, a sealing buffer ring is mounted at the connection between each rod and the tank body, one end of each rod penetrates through the sealing buffer ring and extends into the tank body, the second air vibrator is connected with a first connecting plate through the rod, the edges of the two ends of the first connecting plate are connected with first vibration plates, the first air vibrator is connected with a second connecting plate through the rod, and the edges of the two ends of the second connecting plate are connected with upper and lower vibration plates.

[0014] Preferably, a circular hole is formed in the bottom of the lower vibration plate, the diameter of the circular hole is larger than the diameter of the connecting rod, the top end of the connecting rod penetrates through the circular hole and is connected with the vibration ball, a port is formed in the top of the second connecting plate, the thickness of the upper vibration plate is greater than that of the lower vibration plate, and the length of the upper vibration plate is less than that of the lower vibration plate.

[0015] Preferably, an air cavity is formed in the inside of the upper vibration plate, a sliding groove is formed in the side of the upper vibration plate away from the second connecting plate and communicates with the air cavity, an air hole is formed in the side of the upper vibration plate close to the second connecting plate and communicates with the air cavity, the air hole communicates with the second cavity through an air inlet pipe, a push plate is slidably connected with the air cavity, the side of the push plate away from the second connecting plate is connected with an extension plate, the extension plate is slidably connected with the sliding groove, and the side of the push plate close to the second connecting plate is connected with the inner wall of the air hole through a plurality of springs.

[0016] Preferably, when the air cavity is not inflated, the side of the extension plate away from the second connecting plate is located in the same plane as the side of the upper vibration plate away from the second connecting plate, and the vibration ball does not contact the upper vibration plate during movement, and when the extension plate is fully extended, the side of the extension plate away from the second connecting plate is located in the same plane as the side of the lower vibration plate away from the second connecting plate.

[0017] A method comprises a heavy metal sewage treatment device for farmland irrigation, an inlet valve, a drainage valve, a backwashing valve, a blowdown valve and a differential pressure detector are electrically connected with a controller through a wire, the differential pressure between the two sides of a membrane is measured in real time through the differential pressure detector, backwashing is started when the differential pressure between the two sides of the membrane reaches an alarm threshold, and the membrane has three processing modes: in a first mode, filtered clean water is input into an underground irrigation pipe network; in an automatic filtration mode, a backwashing signal is obtained through data analysis by a control core controller, and joint calculation is performed on related data of the inlet, blowdown and water quality sensors to complete filter cleaning; and in a time period mode, the control core controller records the running time, and automatically starts the backwashing process at a certain time.

[0018] Beneficial effects: the application provides a heavy metal sewage treatment device and method for farmland irrigation. Compared with the prior art, the following beneficial effects are achieved: 1. The membrane body is composed of an inner membrane and an outer membrane. The outer membrane is made of metal material, and the inner membrane is made of high polymer material. The outer membrane provides a support base for the membrane body and is located on the outside to ensure the stability and impact resistance of the membrane body. The inner membrane provides flexibility for the membrane body. The movement and stretching of the membrane body are controlled by the buoyancy effect, so that the vibration ball moves between the first air vibrator and the second air vibrator, facilitating the control of the vibration of the membrane body in the horizontal and vertical directions, and the pneumatic, vibration and water washing are coordinated with each other to improve the effect and efficiency of backwashing.

[0019] 2. The membrane body is in the shape of a circular truncated cone. When the water flow flows from the small end to the large end of the circular truncated cone, the cross-sectional area of the water flow gradually increases, and the flow velocity gradually decreases. According to the principle of fluid mechanics, this flow state change will produce a similar "diffusion" effect, so that the impurities are more easily moved to the large end under the action of the water flow, facilitating discharge. Especially for the granular impurities commonly seen in heavy metal filtration, the conical filter screen can effectively prevent the impurities from accumulating locally in the filter screen, reducing the situation that the filter screen is blocked due to impurity accumulation.

[0020] 3. The wind power generated by the fan 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 vibration ball. When the extension plate is extended, it facilitates the vibration of the vibration ball in the vertical direction driven by the extension plate and the lower vibration plate.

[0021] 4. Air flushing, water flushing and vibration are coordinated with each other. Air flushing causes water to produce turbulent flow, and impurities are subjected to horizontal and vertical forces, so that the impurities are loosened. Vibration causes the filter screen to produce high-frequency vibration through mechanical force, which directly acts on the impurities on the filter screen, further destroys the adhesion between the impurities and the filter screen, and makes the heavy metal impurities more easily fall off. Water flushing provides direct flushing power, and the water flow can carry away the loosened impurities. The pressure of water flushing can also flush the impurities on the filter screen. In combination with air flushing and vibration, the impurities can be subjected to force from different directions, so that the impurities are more easily detached from the pores and surface of the filter screen, thereby achieving the benefits of enhancing the loosening effect of impurities, improving the uniformity of flushing, optimizing the water flow state, and prolonging the service life of the filter screen. BRIEF DESCRIPTION OF DRAWINGS

[0022] The accompanying drawings, which are incorporated herein and constitute part of the specification, illustrate embodiments of the application and, together with the description, further serve to explain the principles of the application and to enable a person skilled in the relevant art to implement and use the 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 mold, 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 reference signs in the figure are: 11, tank body; 12, water inlet valve; 13, water outlet valve; 14, backflush pipe; 15, blowdown pipe; 16, differential pressure detector; 21, outer membrane; 22, inner membrane; 23, hole; 24, floating plate; 25, vibrating ball; 26, elastic connecting piece; 27, moving ring; 28, buffer ring; 29, limiting rod; 31, connecting rod; 32, baffle; 41, fan; 42, air box; 43, first cavity; 44, second cavity; 45, hydraulic cylinder; 46, pipeline; 47, ring box; 48, aeration head; 49, sealing plate; 51, air inlet pipe; 52, rod body; 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, circular hole; 63, upper vibrating plate; 64, spring; 65, push plate; 66, extension plate; 71, port; 72, air hole; 73, air cavity; 74, chute.

[0039] As shown in the figure, in order to clearly realize the structure of the embodiments of the present application, specific structures and devices are marked in the figure, but this is only for the need of illustration, and is not intended to limit the present application in this specific structure, device and environment, and those skilled in the art can adjust or modify these devices and environment according to specific needs, and the adjustment or modification still includes in the scope of the appended claims. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application is described clearly and completely, obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] As Figure 1 Figure 14 As shown in the figure, the embodiments of the present application provide a heavy metal sewage treatment device for farmland irrigation, which comprises a tank body 11, the tank body 11 is communicated with a water inlet valve 12, a water outlet valve 13, a backflush pipe 14 and a blowdown pipe 15, and a differential pressure detector 16 is installed on one side of the tank body 11.

[0042] A ring box 47 is connected with the side wall of the bottom end of the tank body 11, a plurality of aeration heads 48 are communicated with the top of the ring box 47, and the ring box 47 is communicated with a fan 41 through an air box 42.

[0043] A membrane body is connected with 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 a circular truncated cone, and a vibrating ball 25 is connected with the top of the membrane body through a floating plate 24.

[0044] ​The membrane body is a circular truncated cone. When the water flows from the small end to the large end of the circular truncated cone, the cross-sectional area of the water flow gradually increases, and the flow velocity gradually decreases. According to the principle of fluid mechanics, this change in flow state will produce a similar "diffusion" effect, making it easier for impurities to move towards the large end under the action of water flow, facilitating discharge. In particular, for the granular impurities commonly found in heavy metal filtration, the conical filter screen can effectively prevent impurities from accumulating locally, reducing the risk of filter screen blockage caused by impurity accumulation. The cross-section of the cylindrical filter screen is relatively uniform, and during backwashing, the scouring force of the water flow on the impurities on the filter screen is relatively concentrated on the surface of the filter screen. For some impurities attached to the deep or corner of the filter screen, it may not be able to generate enough force to make them discharge, making it easy to cause impurity residue; due to the particularity of the circular truncated cone shape, the backwashing water flow will form a natural diffusion flow field during the process of flowing from the small end to the large end of the circular truncated cone, making the water flow more evenly distributed on the filter screen, providing a more balanced scouring on the entire filter screen surface, thereby improving the uniformity of the backwashing effect. The backwashing water flow of the cylindrical filter screen usually enters uniformly from one side or around the filter screen. Inside the filter screen, the water flow may be affected by the structure of the filter screen and the water flow resistance, resulting in some differences in backwashing intensity between the center and the edge of the filter screen, making it difficult to achieve completely uniform backwashing; the circular truncated cone structure has good stability in mechanics and can withstand a large water flow impact force without deforming easily. This is very important for ensuring the filtering accuracy and backwashing effect of the filter screen, especially when dealing with high-pressure and large-flow heavy metal sewage, the conical filter screen can better maintain its shape and performance. When the cylindrical filter screen is subjected to the impact force of backwashing water flow, especially when the height of the filter screen is high or the water flow impact force is large, local deformation or shaking may occur. This not only affects the filtering effect of the filter screen, but also may cause uneven distribution of backwashing water, further reducing the backwashing efficiency.

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

[0046] The inner membrane 22 is connected to the inner side of the outer membrane 21 and is adapted to the outer membrane. The side of the inner membrane 22 is provided with a hole 23, and one end of the hole 23 extends through the side of the outer membrane. The top of the floating plate 24 is connected to the vibration ball 25 through a connecting rod 31. The side of the floating plate 24 is connected to a shift ring 27 through an elastic connecting piece 26. The inner wall of the shift ring 27 is connected to a buffer ring 28. The top wall of the tank body 11 is connected to a limiting rod 29, which is slidingly connected to the buffer ring 28. The bottom of the limiting rod 29 is connected to a baffle 32.

[0047] The projection of the top of the elastic connecting piece 26 is a nearly 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 a high polymer material.

[0048] The outer membrane 21 is made of stainless steel fiber, and the inner membrane 22 is made of polypropylene and polytetrafluoroethylene high polymer material. The stainless steel fiber has high strength, good corrosion resistance and high temperature resistance, and can provide basic structural support and stable filtration performance for the membrane body. The high polymer polymer gives the membrane body flexibility and good chemical stability. During backwashing, the stainless steel fiber ensures that the filter screen will not easily deform when subjected to water flow impact, maintaining the shape and structural integrity of the membrane body. The flexibility of the high polymer polymer allows the membrane body to bend and deform to some extent, which helps to remove impurities attached to the filter screen and prevents impurities from remaining.

[0049] A plurality of aeration heads 48 are equidistantly distributed in the circumferential direction of the ring box 47. The bottom of the ring box 47 is connected to a pipeline 46, the bottom end of the pipeline 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 pipeline 46, and the other side of the first cavity 43 is connected to the air outlet 71 of the fan 41. The second cavity 44 is connected to the air inlet pipe 51. A hydraulic cylinder 45 is arranged above the air box 42. The extension 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 extension action.

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

[0051] A circular hole 62 is formed in the bottom of the lower vibration plate 61. The diameter of the circular hole 62 is greater than the diameter of the connecting rod 31. The top end of the connecting rod 31 penetrates through the circular hole 62 and is connected to the vibration ball 25. A port 71 is formed in the top of the second connecting plate 58. The thickness of the upper vibration plate 63 is greater than the thickness of the lower vibration plate 61. The length of the upper vibration plate 63 is less than the length of the lower vibration plate 61.

[0052] The upper vibration plate 63 is internally provided with an air cavity 73, and the side of the upper vibration plate 63 away from the second connecting plate 58 is provided with a sliding groove 74, which is in communication with the air cavity 73; the side of the upper vibration plate 63 close to the second connecting plate 58 is provided with an air hole 72, which is in communication with the air cavity 73 and the second cavity 44 through the air inlet pipe 51; the air cavity 73 is slidingly connected with a push plate 65, the side of the push plate 65 away from the second connecting plate 58 is connected with an extension plate 66, the extension plate 66 is slidingly connected with the sliding groove 74, and the side of the push plate 65 close to the second connecting plate 58 is connected with the inner wall of the air hole 72 through a plurality of springs 64.

[0053] When the air cavity 73 is not inflated, the side of the extension plate 66 away from the second connecting plate 58 is located in the same plane as the side of the upper vibration plate 63 away from the second connecting plate 58, and the vibration ball 25 does not contact the upper vibration 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 is located in the same plane as the side of the lower vibration plate 61 away from the second connecting plate 58.

[0054] A method, comprising a heavy metal sewage treatment device for farmland irrigation, the water inlet valve 12, the water outlet valve 13, the backwashing valve, the blowdown valve, and the differential pressure detector 16 are electrically connected with the controller through a wire, the differential pressure between the two sides of the membrane is measured in real time through the differential pressure detector 16, when the differential pressure between the two sides of the membrane reaches the warning threshold, the backwashing is started, and the equipment is divided into three working modes during operation: the general mode is to filter water quality daily, and then input the filtered clean water into the underground irrigation pipe network; the automatic filtration mode is that the backwashing signal is obtained through data analysis by the intelligent control core controller, the related data of the water inlet, blowdown, and water quality sensor are calculated jointly, and the filter element cleaning is completed; the time period mode is that the running time is recorded by the intelligent control core controller, and the backwashing process is automatically started at a certain time.

[0055] During use, the differential pressure between the two sides of the membrane is measured in real time through the differential pressure detector 16, and when the differential pressure between the two sides of the membrane reaches the warning threshold, the backwashing is started.

[0056] The fan 41 and the second air vibrator 54 can be started, and the air of the fan 41 enters the first cavity 43, the pipeline 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 cause turbulence and stirring of the water flow during the rising process, increase the shearing force and scouring force of the water flow on the impurities, loosen the impurities attached to the filter material or filter core, and expose some impurities hidden in the gaps of the filter material or the inside of the filter core. At this time, the vibration ball 25 is located at the highest point, the membrane body is completely stretched in the vertical direction, the vibration ball 25 is located between the two first vibration plates 57, the second air vibrator 54 is started, and the first vibration plate 57 generates vibration in the horizontal direction with the vibration ball 25. The horizontal vibration can make the impurities on the filter screen move in the horizontal direction, break the static state of the impurities on the filter screen, and make it easier to separate from the holes 23 of the filter screen. For those impurities that are attached to the filter screen in the horizontal direction during the filtering process, the horizontal vibration can directly push them to the edge of the filter screen or the direction of the water flow, so that they are easily washed away by the water flow. The horizontal vibration can also make the 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 each part of the filter screen, improving the effect of backwashing, reducing the situation that some areas are not completely washed due to uneven distribution of impurities, and closing the second air vibrator 54.

[0057] The valves of the backwashing pipe 14 and the blowdown pipe 15 are opened, and the water flow flows down from the top of the tank 11, so that the gas and water act on the filter layer at the same time. The bubbles formed by the gas cause turbulence and stirring of the water flow during the rising process, increase the shearing force and scouring force of the water flow on the impurities, and at the same time, the backwashing water provides a medium for carrying and discharging the impurities. The gas-water simultaneous action mode can quickly remove the impurities from the surface of the filter material or filter core.

[0058] The valve of the backwashing pipe 14 can be closed, and the valve of the blowdown pipe 15 is delayed for a period of time to close. The water level in the tank 11 decreases, the buoyancy acting on the floating plate 24 decreases, and the floating plate 24 moves downward with the vibration ball 25. At this time, the vibration ball 25 is located between the upper vibration plate 63 and the lower vibration plate 61, and the membrane body is no longer completely stretched by the floating plate 24. The inner membrane 22 of the membrane body is a high polymer, and the membrane body has good flexibility, which facilitates the small amplitude vibration of the membrane body in the vertical direction.

[0059] Then start the hydraulic cylinder 45, fan 41, the extension of the hydraulic cylinder 45 with the sealing plate 49 up, the first cavity 43 and the second cavity 44 is no longer isolated by the sealing plate 49, the first cavity 43 and the second cavity 44 bottom connected, the wind from the fan 41 outlet 71 into the first cavity 43, the second cavity 44, pipeline 46, ring box 47, aerator 48, air pipe 51, air hole 72, air cavity 73, aerator 48 will be scattered to the tank 11 in the gas. Wind into the air cavity 73, air cavity 73 gas increases, the push plate 65 pressure increases, the push plate 65 with the extension plate 66 away from the second connecting plate 58 direction, spring 64 stretch, the final extension plate 66 from the chute 74 completely stretched out, the extension plate 66 away from the second connecting plate 58 side and the lower vibration plate 61 away from the second connecting plate 58 side in the same plane, through the extension plate 66 increase the length of the upper vibration plate 63, start the first air vibrator 53, the first air vibrator 53 through the upper vibration plate 63, extension plate 66, lower vibration plate 61 driven vibration ball 25, vibration ball 25 along the vertical direction vibration, vertical vibration can make the impurities attached to the filter screen surface perpendicular to the force, this force helps to overcome the adhesion between the impurities and the filter screen, so that the impurities more easily from the filter screen. Especially for those closely attached to the filter screen hole 23 gap or surface of the small particles, vertical vibration can through the instantaneous impact force, the impurities shake off, so as to improve the degree of cleaning of the filter screen. Also can make the filter screen hole 23 gap in the vibration process of instantaneous expansion and contraction, help the water flow more smoothly through the filter screen, improve the permeability efficiency of backwash water. So that the backwash water can better reach the deep part of the filter screen, wash out the impurities hidden in the internal, is very beneficial to improve the deep filtration effect of the filter screen and prolong the service life of the filter screen.

[0060] Close the first air vibrator 53, open the valve of the backflush pipe 14 and the sewage pipe 15, flush out the impurities inside the membrane.

[0061] Also can be backwash at the same time of the first air vibrator 53 and the second air vibrator 54 vibration, air flushing, water flushing, vibration cooperation, air flushing makes water turbulence, impurities receive horizontal and vertical force, impurities loose, vibration through the mechanical force makes the filter screen high frequency vibration, directly acts on the impurities on the filter screen, further destroy the adhesion between the impurities and the filter screen, so that the heavy metal impurities more easily fall off, water flushing provides direct flushing power, water flow can take away the loose impurities, the pressure of water flushing can also flush the impurities on the filter screen, with air flushing and vibration, can exert force on the impurities from different directions, so that the impurities more easily fall off from the hole 23 gap and the surface of the filter screen, has the benefits of enhancing the impurities loose effect, improving the flushing uniformity, optimizing the water flow state, prolonging the service life of the filter screen.

[0062] The wind power generated by the fan 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 vibration ball 25. When the extension plate 66 is extended, it is convenient for the extension plate 66 to vibrate with the lower vibration plate 61 to drive the vibration ball 25 in the vertical direction.

[0063] The present application encompasses any alternatives, modifications, equivalent methods and solutions made in the spirit and scope of the present application. In order to make the public have a thorough understanding of the present application, the specific details are described in detail in the above preferred embodiments of the present application, and the present application can also be completely understood without the description of these details for those skilled in the art. In addition, in order to avoid unnecessary confusion to the essence of the present application, well-known methods, processes, procedures, elements and circuits, etc. are not described in detail.

[0064] The above is only the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can also be made, which should be considered as the protection scope of the present application.

Claims

1. A heavy metal wastewater treatment device and method for farmland irrigation, characterized in that, include: Tank (11), the tank (11) is connected to a water 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). A 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 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.

2. The heavy metal wastewater treatment device and method 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 inner membrane (22) has a hole (23) through it on its side, 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). The side of the float plate (24) is connected to the moving ring (27) through the elastic connecting piece (26). The inner wall of the moving 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 and method 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 material.

4. The heavy metal wastewater treatment device and method 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 (71) 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.

5. The heavy metal wastewater treatment device and method for farmland irrigation according to claim 1, characterized in that: The second air vibrator (54) is installed on the outside of the tank (11). The rod (52) 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 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 rod (52) and the tank (11). One end of each rod (52) passes through a sealing buffer ring (55) and extends into the tank (11). The second air vibrator (54) is connected to a first connecting plate (56) through the rod (52). The edges of both ends of the first connecting plate (56) are connected to first vibrating plates (57). The first air vibrator (53) is connected to a second connecting plate (58) through the rod (52). The edges of both ends of the second connecting plate (58) are connected to an upper vibrating plate (63) and a lower vibrating plate (61).

6. The heavy metal wastewater treatment device and method for farmland irrigation according to claim 5, 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).

7. The heavy metal wastewater treatment device and method for farmland irrigation according to claim 5, characterized in that: 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). 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) close to the second connecting plate (58) and 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) close to the second connecting plate (58) is connected to the inner wall of the air hole (72) through several springs (64).

8. The heavy metal wastewater treatment device and method for farmland irrigation according to claim 7, 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.

9. A method comprising the heavy metal wastewater treatment device for farmland irrigation according to any one of claims 1-8, characterized in that: The inlet valve (12), outlet valve (13), backwash valve, sewage valve, and differential pressure detector (16) are all electrically connected to the controller via a wire. 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 inputs filtered water into the underground irrigation network; the automatic filtration mode is achieved by the intelligent control core controller obtaining backwashing signals through data analysis and performing joint calculations based on relevant data from the inlet, sewage, and water quality sensors to complete filter cleaning; the time-based mode is achieved by the control core controller recording the running time and automatically initiating the backwashing process after a certain period.

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