A farmland effluent treatment device based on MABR membrane and a treatment process

Abstract

The present application relates to sewage treatment technical field, specifically to a kind of farmland effluent treatment equipment and treatment process based on MABR membrane;Including control unit, rotating grid, sand trap, homogenizing tank, reaction tank, water purification mechanism, secondary sedimentation tank and sludge tank;Homogenizing tank is used to homogenize water quality, water purification mechanism is installed in the reaction tank, water purification mechanism is used to complete the cleaning of pre-filter screen while treating water quality by MABR membrane;The secondary sedimentation tank and the sludge tank are both installed at the end of the reaction tank;The present application only needs to increase the number of its water purification mechanism when the treatment standard needs to be improved, which can complete the improvement of its treatment standard, and through the expansion pipe inside, fully utilize the unused oxygen during aeration to periodically expand the expansion pipe, increase the flowability of water flow in the water purification mechanism, and thus better purify the sewage, avoid waste of electric power energy and chemical resources.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment, in particular to a farmland effluent treatment equipment based on MABR membrane and a treatment process. BACKGROUND

[0002] The existing farmland effluent treatment adopts the traditional biochemical method to treat farmland sewage, but due to the large impact of farmland wastewater and the high concentration of nitrogen and phosphorus in farmland wastewater, compared with industrial wastewater, the treatment difficulty is greater, so the traditional biochemical method cannot well treat farmland effluent, and with the continuous improvement of the treatment standard, it is usually necessary to invest high energy consumption and high material consumption to improve the effluent quality so as to meet the treatment standard, thereby increasing the treatment cost of farmland effluent.

[0003] Therefore, the present application designs a farmland effluent treatment equipment based on MABR membrane and a treatment process to solve the above technical problems. SUMMARY

[0004] The present application solves the technical problem that the existing farmland effluent treatment adopts the traditional biochemical method to treat farmland sewage, but due to the large impact of farmland wastewater and the high concentration of nitrogen and phosphorus in farmland wastewater, compared with industrial wastewater, the treatment difficulty is greater, so the traditional biochemical method cannot well treat farmland effluent, and with the continuous improvement of the treatment standard, it is usually necessary to invest high energy consumption and high material consumption to improve the effluent quality so as to meet the treatment standard, thereby increasing the treatment cost of farmland effluent.

[0005] The present application provides the following technical scheme: a farmland effluent treatment equipment based on MABR membrane, comprising a control unit, a grit chamber, a homogenizing tank, a reaction tank, a rotating grid, a water purification mechanism, a secondary sedimentation tank and a sludge tank; the control unit is installed on one side of the reaction tank, a homogenizing tank is arranged beside the control unit, the homogenizing tank is used for homogenizing water quality, thereby cooperating with the subsequent reaction tank to treat the water quality; the reaction tank is installed on the ground, and the rotating grid is installed at the end of the reaction tank; the water purification mechanism is installed in the reaction tank, and the water purification mechanism is used for treating the water quality through the MABR membrane and cleaning the pre-filtering screen at the same time; the secondary sedimentation tank and the sludge tank are both installed at the end of the reaction tank.

[0006] Preferably, the water purification mechanism comprises a fixed frame, a filter screen, a MABR membrane, an air inlet pipe, an air outlet pipe, an expansion pipe and a cleaning assembly, the fixed frame is installed inside the reaction tank, one end of the fixed frame is provided with the filter screen, the rear of the filter screen is provided with the MABR membrane, the top of the fixed frame is provided with the air inlet pipe, the bottom end of the fixed frame is provided with the air outlet pipe, the air outlet pipe is provided with the expansion pipe, the expansion pipe is connected with the cleaning assembly through a hose, and the cleaning assembly is used for periodically cleaning the filter screen through the gas discharged from the expansion pipe.

[0007] Preferably, the cleaning assembly comprises a moving groove, a sliding plate, a sealing gasket, a cleaning brush and an air outlet hole, the moving groove is installed inside the fixed frame, the sliding plate is installed in the moving groove, the sealing gasket is installed at the top end of the moving groove, the cleaning brush is installed on the sliding plate in the direction of contact with the filter screen, and the air outlet hole is installed on the fixed frame and is provided with a one-way valve.

[0008] Preferably, the sliding plate is provided with a rubber piston.

[0009] 4. The MABR membrane-based farmland water treatment device according to claim 3, wherein the sliding plate is provided with a return spring.

[0010] Preferably, the expansion pipe is provided with an array of spherical air bags, the spherical air bags are periodically inflated to drive the water flow in the water purification mechanism, thereby improving the utilization rate of oxygen.

[0011] Preferably, the bottom of the air outlet pipe is provided with a uniform gas chamber, the uniform gas chamber is provided with an array of air outlet pipes, and the air outlet pipes are connected with the expansion pipe.

[0012] Preferably, the air outlet pipe is provided with a spherical check valve, and the spherical check valve has a quarter gap.

[0013] Preferably, a plurality of water purification mechanisms are installed in the reaction tank in a U-shaped distribution.

[0014] Preferably, the mesh number of the filter screen in each water purification mechanism decreases in the direction of water flow.

[0015] A MABR membrane-based farmland water treatment process, the process comprising the following steps:

[0016] S1: The control unit separates and cleans a large amount of solid substances through the rotating grid, and then the sewage flows into the sand settling tank;

[0017] S2: The control unit controls the water flow to be deposited in the sand settling tank, and after the sand in the sand settling tank is preliminarily cleaned, the water flow is transported into the homogenizing tank through a pump;

[0018] S3: After the sewage is homogenized in the homogenizing tank, the sewage enters the water purification mechanism in the reaction tank;

[0019] S4: After the water flow is filtered by the filter screen in the water purification mechanism, the control unit controls the aeration device to fill oxygen into the water purification mechanism through the air inlet pipe, a small part of the oxygen flows into the MABR membrane through the air inlet pipe, and most of the oxygen flows into the air chamber through the air inlet pipe; after the water flow reacts in the MABR membrane, a large amount of impurities in the water are removed;

[0020] S5: After the oxygen enters the air chamber, it flows to the expansion pipe through the air outlet pipe, and under the periodic inflation of the spherical air bag, the water flow in the water purification mechanism is driven to flow, improving the utilization rate of oxygen by the MABR membrane;

[0021] S6: The gas flows from the expansion pipe into the moving groove, the gas in the moving groove pushes the moving plate to move downward to drive the cleaning brush to move downward to clean the filter screen, and at the same time, the gas in the expansion pipe flows out through the air outlet hole in the moving groove, and the moving plate is reset under the pulling of the reset spring; the subsequent water purification mechanisms repeat the operation;

[0022] S7: After the sewage is filtered by the multi-stage water purification mechanism, it enters the secondary sedimentation tank and is separated and precipitated in the secondary sedimentation tank, the upper layer is water meeting the discharge standard, and the lower layer is sludge, the control mechanism controls the water to be discharged and controls the sludge to enter the sludge tank.

[0023] The beneficial effects of the present application are as follows:

[0024] 1. The present application sets MABR membrane in the water purification mechanism, and the oxygen utilization rate of MABR membrane is more than 3 times that of traditional nano aeration disc, so that the same amount of wastewater treatment using MABR membrane mechanism only needs smaller air volume to achieve better treatment effect than nano aeration disc, and the indigenous microorganism strain film grows on the surface of MABR membrane, which is more efficient in removing permanganate, nitrogen and phosphorus and other pollutants in water than traditional biochemical method, thereby further improving the treatment effect of agricultural wastewater.

[0025] 2. The present application sets the water purification mechanism in the reaction tank, and the water purification mechanism purifies and treats the sewage of farmland runoff water through the arrayed MABR membrane, and when the treatment standard needs to be improved, the number of water purification mechanisms can be increased to improve the treatment standard, and the whole process does not need too much energy consumption, and the expansion pipe inside the water purification mechanism fully utilizes the unused oxygen during aeration to periodically expand the expansion pipe, thereby increasing the flowability of the water flow in the water purification mechanism, and further purifying the sewage, avoiding waste of electric power and chemical resources.

[0026] 3. The present application sets the cleaning mechanism on the filter screen, and the unused oxygen pushes the sliding plate of the cleaning mechanism to clean the filter screen, thereby avoiding the problem of low purification efficiency of the water purification mechanism caused by the blockage of the filter screen; at the same time, the oxygen is released to reset the sliding plate after the sliding plate moves to the limit position, thereby the sliding plate cleans the filter screen again, ensuring the purification efficiency of the water purification mechanism. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Figure 1 It is the overall schematic diagram of the present application;

[0029] Figure 2 It is the schematic diagram of the purification mechanism of the present application;

[0030] Figure 3 It is the schematic diagram of the fixed frame of the present application;

[0031] Figure 4 It is the front view of the purification mechanism of the present application;

[0032] Figure 5 It is the C-C direction sectional view of the present application;

[0033] Figure 6 It is the internal schematic diagram of the sliding groove of the present application;

[0034] Figure 7 It is the schematic diagram of the expansion pipe of the present application;

[0035] Figure 8 It is the schematic diagram of the air equalizing chamber of the present application;

[0036] Figure 9 It is the schematic diagram of the spherical check valve of the present application;

[0037] Figure 10 It is the schematic diagram of the sliding block of the present application;

[0038] Figure 11 It is the process flow chart of the present application.

[0039] In the figure: 1, control unit; 2, rotating grid; 3, grit chamber; 4, homogenizing tank; 5, reaction tank; 6, water purification mechanism; 61, fixed frame; 62, filter screen; 63, MABR membrane; 64, air inlet pipe; 65, air outlet pipe; 651, spherical check valve; 66, expansion pipe; 661, spherical air bag; 67, cleaning assembly; 671, moving groove; 672, sliding plate; 673, sealing gasket; 674, cleaning brush; 675, air outlet hole; 676, rubber piston; 677, return spring; 68, air equalizing chamber; 7, secondary sedimentation tank; 8, sludge tank. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Therefore, the following detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but merely represents a part of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0041] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0042] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "back" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is usually placed. Such terms are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] It should also be noted that, in the description of the present application, unless otherwise explicitly specified and limited, the terms "arrangement", "installation", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0044] This disclosure aims to address the problem that existing farmland runoff treatment equipment, with increasingly stringent treatment standards, typically requires high energy and material consumption to improve effluent quality and meet those standards, resulting in significant waste of electrical and chemical resources. Therefore, this disclosure proposes a farmland runoff treatment device and process based on MABR membranes. The water purification unit within the device uses an array of MABR membranes to purify the farmland runoff. When higher treatment standards are required, simply increasing the number of purification units suffices to meet the increased standards. The entire process requires minimal energy consumption. Furthermore, the internal expansion tubes fully utilize the residual oxygen from aeration to periodically expand the tubes, increasing the flow of water within the purification unit and thus improving wastewater purification while avoiding the waste of electrical and chemical resources.

[0045] like Figures 1 to 9 As shown, a farmland drainage treatment device based on an MABR membrane includes a control unit 1, a sedimentation tank 3, a homogenizing tank 4, a reaction tank 5, a rotating bar screen 2, a water purification mechanism 6, a secondary sedimentation tank 7, and a sludge tank 8. The control unit 1 is installed on one side of the reaction tank 5, and the homogenizing tank 4 is located next to the control unit 1. The homogenizing tank 4 is used to homogenize the water quality, thereby cooperating with the subsequent reaction tank 5 to treat the water quality. The reaction tank 5 is installed on the ground, and the rotating bar screen 2 is installed at the end of the reaction tank 5. The water purification mechanism 6 is installed inside the reaction tank 5. The water purification mechanism 6 is used to treat the water quality through the MABR membrane 63 while cleaning the pre-filter screen 62. The secondary sedimentation tank 7 and the sludge tank 8 are both installed at the end of the reaction tank 5.

[0046] During operation, control unit 1 controls the water flow to settle in sedimentation tank 3, initially removing silt and sand, and then pumps it to homogenization tank 4. After homogenization in homogenization tank 4, the wastewater enters reaction tank 5. Control unit 1 uses rotating screen 2 to isolate and remove a large amount of solid matter, and then the wastewater flows to water purification unit 6. After the water flows through filter screen 62 in water purification unit 6, control unit 1 controls the aeration device to inject oxygen into water purification unit 6 through air inlet pipe 64. A small portion of the oxygen flows through air inlet pipe 64 into the MABR membrane 63, and most of the oxygen flows through air inlet pipe 64 into air equalization chamber 68. After the water flows through the MABR membrane 63, a large amount of impurities in the water is removed. After the oxygen enters air equalization chamber 68, it flows through air outlet pipe 65 to expansion pipe 66, and under the periodic expansion of spherical air bladder 661, it drives the water flow in water purification unit 6, improving the oxygen utilization rate of MABR membrane 63. The gas flows from pipe 66 into moving trough 671. The gas in moving trough 671 pushes the moving plate downward, causing the cleaning brush 674 to move downward to clean the filter screen 62. At the same time, the gas in expansion pipe 66 flows out through the air outlet 675 in moving trough 671. The moving plate is reset under the pull of the reset spring 677. Subsequent water purification mechanisms 6 repeat this operation. After being filtered by the multi-stage water purification mechanism 6, the sewage enters the secondary sedimentation tank 7, where it is separated and settled. The upper layer is water that meets the discharge standards, and the lower layer is sludge. The control mechanism controls the water discharge and controls the sludge to enter the sludge tank 8, thereby completing the sewage treatment work.

[0047] like Figures 1 to 11 As shown, the water purification mechanism 6 includes a mounting frame 61, a filter screen 62, a MABR membrane 63, an air inlet pipe 64, an air outlet pipe 65, an expansion pipe 66, and a cleaning assembly 67. The mounting frame 61 is installed inside the reaction tank 5 and is used to fix the entire water purification mechanism 6. A filter screen 62 is installed at one end of the mounting frame 61, which is used to initially clean fine impurities in the wastewater. A MABR membrane 63 is installed behind the filter screen 62. The MABR membrane 63 achieves biochemical treatment of wastewater through the biological bacteria attached to its special layered structure. An air inlet pipe 64 is installed above the fixed frame 61, which is used to aerate the water purification mechanism 6 from the outside. An air outlet pipe 65 is installed at the bottom of the fixed frame 61, which is used to discharge the oxygen that has not been fully used for reuse. An expansion pipe 66 is installed on the air outlet pipe 65, which is used to expand when oxygen passes through, thereby increasing the water flow of the water purification mechanism 6. The expansion pipe 66 is connected to a cleaning component 67 through a hose, which is used to periodically clean the filter screen 62 through the gas discharged from the expansion pipe 66.

[0048] During operation, the water first undergoes preliminary filtration through the filter screen 62, then flows to the MABR membrane 63 module. Simultaneously, the control mechanism controls the aeration device to aerate the MABR membrane 63 through the air inlet pipe 64. Gas enters the water purification unit 6 through the air inlet pipe 64, which has an array of through holes and is wrapped with a waterproof and breathable membrane. After aeration, the MABR membrane 63 purifies the wastewater. Unused oxygen enters the expansion pipe 66 through the air outlet pipe 65. The expansion pipe 66 expands, increasing the flow of water within the water purification unit 6, thus enabling the MABR membrane 63 to better treat the wastewater. At the same time, oxygen flows from the expansion pipe 66 to the cleaning mechanism, which cleans the filter screen 62 to prevent clogging and maintain water flow efficiency.

[0049] The above-mentioned water purification device 6 can not only effectively improve the standard of sewage treatment, but also reduce the consumption of energy and chemical agents. The sewage is purified by aeration of the water purification device 6, which allows biomass to grow on the MABR membrane 63. This method greatly reduces energy consumption.

[0050] like Figures 2 to 5 and Figure 11 As shown, the cleaning assembly 67 includes a moving groove 671, a sliding plate 672, a sealing gasket 673, a cleaning brush 674, and an air vent 675. The moving groove 671 is installed inside the fixed frame 61 and provides space for the sliding plate 672 to slide. The sliding plate 672 is installed inside the moving groove 671 and slides downward under air pressure. A sealing gasket 673 is installed at the top of the sliding plate 672 and the moving groove 671. 3. To prevent gas from escaping from the moving groove 671; a cleaning brush 674 is installed on the sliding plate 672 in the direction of contact with the filter screen, and the cleaning brush 674 is used to clean the filter screen 62 by moving the sliding plate 672 up and down; an air outlet 675 is installed on the fixed frame 61, and a one-way valve is installed inside the air outlet 675. The one-way valve is used to allow oxygen to flow out from the moving groove 671. After flowing out, it can be collected through a pipe for reuse, and at the same time, it prevents water from flowing into the sliding groove from the one-way valve.

[0051] During operation, gas flows into the sliding groove from the expansion pipe 66. As the gas pressure increases, the gas pushes the sliding block downwards, which in turn drives the cleaning brush 674 downwards. The sliding cleaning brush 674 moves downwards to clean the filter screen 62. After the cleaning brush 674 reaches the bottom, the sealing gasket 673 unfolds along with the movement of the cleaning brush 674. Gas flows out of the sliding groove from the one-way valve. At the same time, a clamping device can be provided at the bottom of the sliding groove, which can slowly remove the sliding block from the clamping device. This method allows the sliding block to slowly reset when there is no continuous flow of gas in the sliding groove, thereby allowing the gas in the sliding groove to flow out from the one-way valve. For smaller water purification mechanisms 6, the above effect can be achieved solely through the friction between the rubber piston 676 and the sliding groove.

[0052] like Figure 6 As shown, a rubber piston 676 is installed in the moving groove 671 on the sliding plate 672. The rubber piston 676 is used to ensure that the gas pushes the sliding plate 672 to move. At the same time, when the sliding plate 672 is reset, the friction between the rubber piston 676 and the sliding plate 672 causes the sliding plate 672 to slowly reset.

[0053] like Figure 6 As shown, a reset spring 677 is installed inside the sliding plate 672. The reset spring 677 is used to slowly reset the sliding block when there is no air pressure in the sliding groove. Therefore, under the action of the reset spring 677, the sliding plate 672 can be periodically moved on the filter screen 62 according to the aeration of the water purification mechanism 6, thereby completing the cleaning of the filter screen 62.

[0054] like Figure 7 As shown, the expansion tube 66 is arrayed with spherical airbags 661. The spherical airbags 661 expand periodically, thereby driving the water flow in the water purification mechanism 6 and improving the oxygen utilization rate. The spherical airbags 661 can expand and compress the MABR membrane 63, and at the same time, they can also make the water flow in the water purification mechanism 6, thereby improving the oxygen utilization rate of the MABR membrane 63.

[0055] like Figure 8 As shown, a gas equalization chamber 68 is installed at the bottom of the gas outlet pipe 65, which is used for initial gas collection; gas outlet pipes 65 are arrayed on the gas equalization chamber 68, and the gas outlet pipes 65 are connected to the expansion pipe 66; gas flows from the gas outlet pipe 65 to the expansion pipe 66. By setting the gas equalization chamber 68, the expansion pipe 66 is not expanded when the water purification mechanism 6 first starts working, so that microorganisms can better attach to the MABR membrane 63. When the gas equalization chamber 68 is full of gas, the gas flows from the gas outlet pipe 65 to the expansion pipe 66 to expand the expansion pipe 66.

[0056] like Figure 9As shown, a spherical baffle valve 651 is provided inside the vent pipe 65. The spherical baffle valve 651 has a quarter notch. The spherical baffle valve 651 is rotatably installed at the outlet position of the vent pipe 65. When gas flows to the spherical baffle valve 651, the spherical baffle valve 651 rotates, which can make the gas move periodically towards the expansion pipe 66, thereby causing the spherical air bladder 661 on the expansion pipe 66 to expand periodically, making the sewage flow more fluid and increasing the oxygen utilization rate of the MABR membrane 63.

[0057] like Figure 1 As shown, multiple water purification units 6 are arrayed in the reaction tank 5, and the water purification units 6 are distributed in a U-shape. The mesh count of the filter screen 62 in each water purification unit 6 decreases sequentially with the direction of water flow. The U-shaped distribution of the water purification units 6 can treat sewage in a step-by-step manner, and the step-by-step decrease in the mesh count of the filter screen 62 is also used to better filter sewage.

[0058] like Figure 11 As shown, a farmland runoff treatment process based on MABR membrane 63 includes the following steps:

[0059] S1: Control unit 1 isolates and cleans a large amount of solid matter through rotating screen 2, and then the sewage flows to grit chamber 3;

[0060] S2: Control unit 1 controls the water flow to settle in the sedimentation tank 3 and preliminarily cleans the silt and sand in it before pumping it to the homogenization tank 4;

[0061] S3: After being homogenized in the homogenizing tank 4, the wastewater enters the water purification unit 6 in the reaction tank 5;

[0062] S4: After the water is filtered by the filter screen 62 in the water purification unit 6, the control unit 1 controls the aeration device to inject oxygen into the water purification unit 6 through the air inlet pipe 64. A small portion of the oxygen flows into the interior of the MABR membrane 63 through the air inlet pipe 64, and most of the oxygen flows into the air equalization chamber 68 through the air inlet pipe 64. After the water is reacted in the MABR membrane 63, a large number of impurities in the water are removed.

[0063] S5: After oxygen enters the gas equalization chamber 68, it flows through the gas outlet pipe 65 to the expansion pipe 66, and under the periodic expansion of the spherical airbag 661, it drives the water flow in the water purification mechanism 6, thereby improving the oxygen utilization rate of the MABR membrane 63.

[0064] S6: Gas flows from the expansion tube 66 into the moving groove 671. The gas in the moving groove 671 pushes the moving plate downward, causing the cleaning brush 674 to move downward to clean the filter screen 62. At the same time, the gas in the expansion tube 66 flows out through the air outlet 675 in the moving groove 671. The moving plate is reset under the pull of the reset spring 677. The subsequent water purification mechanism 6 repeats this operation.

[0065] S7: After being filtered by the multi-stage water purification mechanism 6, the wastewater enters the secondary sedimentation tank 7, where it is separated and settled. The upper layer is water that meets the discharge standards, and the lower layer is sludge. The control mechanism controls the water discharge and controls the sludge to enter the sludge tank 8.

[0066] The working principle is as follows: Control unit 1 controls the water flow to settle in the sedimentation tank 3, and after the sediment is initially removed, it is pumped to the homogenization tank 4. After homogenization in the homogenization tank 4, the wastewater enters the reaction tank 5. Control unit 1 uses rotating screen 2 to isolate and clean a large amount of solid matter, and then the wastewater flows to the water purification unit 6. After the water flows through the filter screen 62 in the water purification unit 6, control unit 1 controls the aeration device to inject oxygen into the water purification unit 6 through the air inlet pipe 64. A small portion of the oxygen flows through the air inlet pipe 64 into the MABR membrane 63, and most of the oxygen flows through the air inlet pipe 64 into the gas equalization chamber 68. After the water flows through the MABR membrane 63, a large amount of impurities in the water is removed. After the oxygen enters the gas equalization chamber 68, it flows through the air outlet pipe 65 to the expansion pipe 66, and under the periodic expansion of the spherical air bladder 661, it drives the water flow in the water purification unit 6, improving the oxygen utilization rate of the MABR membrane 63. The gas flows from pipe 66 into moving trough 671. The gas in moving trough 671 pushes the moving plate downward, causing the cleaning brush 674 to move downward to clean the filter screen 62. At the same time, the gas in expansion pipe 66 flows out through the air outlet 675 in moving trough 671. The moving plate is reset by the pull of the reset spring 677. Subsequent water purification mechanisms 6 repeat this operation. After being filtered by the multi-stage water purification mechanism 6, the sewage enters the secondary sedimentation tank 7, where it is separated and settled. The upper layer is water that meets the discharge standards, and the lower layer is sludge. The control mechanism controls the water discharge and controls the sludge to enter the sludge tank 8, thereby completing the sewage treatment work.

[0067] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A farmland drainage treatment device based on a MABR membrane, characterized in that, The system includes a control unit (1), a rotating screen (2), a grit chamber (3), a homogenizing tank (4), a reaction tank (5), a water purification mechanism (6), a secondary sedimentation tank (7), and a sludge tank (8). The control unit (1) is installed on one side of the reaction tank (5), and the rotating screen (2) is installed on one side of the control unit (1). The homogenizing tank (4) is located next to the control unit (1) and is used to homogenize the water quality, so as to cooperate with the subsequent reaction tank (5) to treat the water quality. The reaction tank (5) is installed on the ground, and the water purification mechanism (6) is installed in the reaction tank (5). The water purification mechanism (6) is used to treat the water quality through the MABR membrane (63) and clean the pre-filter (62). The secondary sedimentation tank (7) and the sludge tank (8) are both installed at the end of the reaction tank (5). The water purification mechanism (6) includes a fixed frame (61), a filter screen (62), a MABR membrane (63), an air inlet pipe (64), an air outlet pipe (65), an expansion pipe (66), and a cleaning component (67). The fixed frame (61) is installed inside the reaction tank (5). A filter screen (62) is installed at one end of the fixed frame (61), and a MABR membrane (63) is installed behind the filter screen (62). An air inlet pipe (64) is installed above the fixed frame (61), and an air outlet pipe (65) is installed at the bottom of the fixed frame (61). An expansion pipe (66) is installed on the air outlet pipe (65), and the expansion pipe (66) is connected to the cleaning component (67) via a hose. The cleaning component (67) is used to periodically clean the filter screen (62) through the gas discharged from the expansion pipe (66). The cleaning assembly (67) includes a moving groove (671), a sliding plate (672), a sealing gasket (673), a cleaning brush (674), and an air outlet (675). The moving groove (671) is installed inside the fixed frame (61). The sliding plate (672) is installed inside the moving groove (671). The sealing gasket (673) is installed at the top of the sliding plate (672) and the moving groove (671). The cleaning brush (674) is installed in the direction of contact between the sliding plate (672) and the filter screen. As the cleaning brush (674) moves, the sealing gasket (673) also unfolds with the movement of the cleaning brush (674). An air outlet (675) is installed on the fixed frame (61), and a one-way valve is installed inside the air outlet (675). A rubber piston (676) is installed in the sliding plate (672) within the moving groove (671); a return spring (677) is installed in the sliding plate (672). The expansion tube (66) is arrayed with spherical airbags (661). The spherical airbags (661) expand periodically, thereby driving the water flow in the water purification mechanism (6) and improving the utilization rate of oxygen.

2. The farmland drainage treatment equipment based on MABR membrane according to claim 1, characterized in that: The bottom of the air outlet pipe (65) is equipped with a uniform air chamber (68), and the air outlet pipe (65) is arranged on the uniform air chamber (68). The air outlet pipe (65) is connected to the expansion pipe (66).

3. The farmland drainage treatment equipment based on MABR membrane according to claim 2, characterized in that: A spherical stop valve (651) is provided inside the air outlet pipe (65), and the spherical stop valve (651) has a quarter notch.

4. The farmland drainage treatment equipment based on MABR membrane according to claim 3, characterized in that: The reaction tank (5) is equipped with an array of multiple water purification units (6), and the water purification units (6) are distributed in a U-shape.

5. The farmland drainage treatment equipment based on a MABR membrane according to claim 4, characterized in that: The mesh size of the filter screen (62) in each of the water purification units (6) decreases sequentially with the direction of water flow.

6. A farmland runoff treatment process based on a MABR membrane (63), characterized in that, The farmland drainage treatment equipment based on a MABR membrane, as described in any one of claims 1 to 5, includes the following steps: S1: The control unit (1) isolates and cleans a large amount of solid material through the rotating screen (2), and then the sewage flows into the grit chamber (3); S2: Control unit (1) controls the water flow to settle in the sedimentation tank (3) and preliminarily cleans the mud and sand in it, and then pumps it to the homogenization tank (4); S3: After being homogenized in the equalization tank (4), the wastewater enters the water purification mechanism (6) of the reaction tank (5); S4: After the water is filtered by the filter screen (62) in the water purification unit (6), the control unit (1) controls the aeration device to inject oxygen into the water purification unit (6) through the air inlet pipe (64). A small portion of the oxygen flows into the MABR membrane (63) through the air inlet pipe (64), and most of the oxygen flows into the air equalization chamber (68) through the air inlet pipe (64). After the water is reacted in the MABR membrane (63), a large number of impurities in the water are removed. S5: After oxygen enters the gas equalization chamber (68), it flows through the gas outlet pipe (65) to the expansion pipe (66), and under the periodic expansion of the spherical air bag (661), it drives the water flow in the water purification mechanism (6), thereby improving the utilization rate of oxygen by the MABR membrane (63). S6: Gas flows from the expansion tube (66) into the moving groove (671). The gas in the moving groove (671) pushes the moving plate downward, causing the cleaning brush (674) to move downward to clean the filter screen (62). At the same time, the gas in the expansion tube (66) flows out through the air outlet (675) in the moving groove (671). The moving plate is reset under the pull of the reset spring (677). The subsequent water purification mechanism (6) repeats this operation. S7: After being filtered by the multi-stage water purification mechanism (6), the sewage enters the secondary sedimentation tank (7) and is separated and settled in the secondary sedimentation tank (7). The upper layer is water that meets the discharge standards, and the lower layer is sludge. The control mechanism controls the water discharge and controls the sludge to enter the sludge tank (8).

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