Pulse aeration device and method

Abstract

The invention relates to the technical field of sewage treatment, in particular to a pulse aeration device and method.The pulse aeration device comprises a rotating body, an aeration body, a top plate, a plurality of MBR membrane assemblies, a bottom plate and a pulse unit, the MBR membrane assemblies are curtain type membranes, and the MBR membrane assemblies are distributed in a rectangular array; the plurality of MBR membrane assemblies are respectively mounted between the top plate and the bottom plate, the plurality of rotating bodies and the plurality of aeration bodies are respectively arranged, the plurality of aeration bodies are respectively embedded among the plurality of MBR membrane assemblies, the upper ends of the plurality of aeration bodies are respectively rotationally connected to the top plate through the plurality of rotating bodies, and the rotating axes of the aeration bodies are vertical to the water flow direction; the pulse unit is used for periodically supplying pulse gas to a plurality of aeration bodies, and enabling the aeration bodies to periodically swing and wash the MBR membrane assemblies on the front side and the rear side of the aeration bodies.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a pulse aeration device and method. Background Technology

[0002] In the MBR wastewater treatment process, MBR modules are generally installed in the aeration tank. Aeration provides the oxygen needed to maintain aerobic microorganisms and also has a certain scouring effect on the membrane modules. However, the following problems exist: 1. The conventional method for removing contaminants from the membrane surface is to aerate the lower part of the membrane module and flush the membrane surface from bottom to top. However, the air bubbles can only clean the outside of the lower membrane module, while the cleaning effect on the middle, upper and internal parts is poor.

[0003] 2. The membrane's shaking effect is weak; the shear force caused by continuous bubble aeration is less than that caused by pulsed bubbles, resulting in lower pollutant removal efficiency on the membrane surface. Summary of the Invention

[0004] The purpose of this invention is to provide a pulse aeration device and method to solve the technical problems existing in the background art.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: A pulse aeration device is installed at the bottom of an aeration tank, comprising: a rotating body, aeration gas, a top plate, MBR membrane modules, a bottom plate, and a pulse unit. The MBR membrane modules are curtain-type membranes and are arranged in a rectangular array. The MBR membrane modules are installed between the top plate and the bottom plate. Several rotating bodies and aeration gas units are also provided, each embedded between one of the MBR membrane modules. The upper ends of each aeration gas unit are rotatably connected to the top plate via a rotating body, and the rotation axis of the aeration gas is perpendicular to the water flow direction. The pulse unit periodically supplies pulse gas to the aeration gas units and causes the aeration gas to periodically oscillate and flush the MBR membrane modules on both sides of its front and rear.

[0006] Furthermore, it also includes: a number of fixing rods, wherein the top plate is fixedly installed on the top of the bottom plate by the number of fixing rods; the number of fixing rods are located on the outside of the outermost MBR membrane module; and the bottom plate is placed on the bottom of the aeration tank.

[0007] Furthermore, the rotating body includes: a first bearing, a rotating shaft, and a second bearing. The first bearing and the second bearing are coaxially spaced apart. The first bearing and the second bearing are respectively located on the left and right sides of the top end of the top plate. The two ends of the rotating shaft are respectively mounted on the first bearing and the second bearing. The top end of the aeration gas is fixedly mounted in the middle of the rotating shaft.

[0008] Furthermore, the aeration gas includes: an aeration gas body and a connecting body, the connecting body being fixedly connected to the top end of the aeration gas body, and a fixing hole being provided in the middle of the rotating shaft, the connecting body passing through and being fixedly connected in the fixing hole.

[0009] Furthermore, the aeration gas body includes: a front plate, a partition, a rear plate, a first air inlet pipe, a second air inlet pipe, an upper plate, a lower plate, a left side plate, and a right side plate; the front plate is a forward-protruding arc-shaped plate, the rear plate is a rearward-protruding arc-shaped plate, and the upper plate, lower plate, left side plate, and right side plate are all planar plates. The front plate, rear plate, upper plate, lower plate, left side plate, and right side plate form a waist-drum-shaped sealed cavity. The partition is disposed between the upper plate and the lower plate and between the left side plate and the right side plate, dividing the sealed cavity into a front cavity and a rear cavity. The front plate is densely covered with several front aeration holes communicating with the front cavity, and the rear plate is densely covered with several rear aeration holes communicating with the rear cavity. The first air inlet pipe and the second air inlet pipe are vertically penetrating and fixedly connected to the front and rear sides of the upper plate, respectively. The first air inlet pipe and the second air inlet pipe are respectively connected to the front cavity and the rear cavity, and the inlet ends of the first air inlet pipe and the second air inlet pipe are respectively connected to the pulse gas outlet of the pulse unit.

[0010] Furthermore, the aeration gas body also includes: a lower scraper and an upper scraper, each with two lower scrapers. The two lower scrapers are symmetrically and horizontally fixedly connected to the lower part of the opposite ends of the left and right side plates, and the two upper scrapers are symmetrically and horizontally fixedly connected to the upper part of the opposite ends of the left and right side plates. The lower and upper scrapers are arranged in parallel. The left and right side plates are densely covered with a number of side aeration holes.

[0011] Furthermore, the pulse unit includes: a storage tank, a connecting pipe, a pulse valve, a first solenoid valve, a first air outlet pipe, a second solenoid valve, and a second air outlet pipe. One end of the connecting pipe is connected to the inner cavity of the storage tank. The pulse valve is mounted on the connecting pipe. One end of the first air outlet pipe and the second air outlet pipe are respectively connected to the other end of the connecting pipe. The first solenoid valve and the second solenoid valve are respectively mounted on the first air outlet pipe and the second air outlet pipe. The other ends of the first air outlet pipe and the second air outlet pipe are respectively connected to the first air inlet pipe and the second air inlet pipe. The storage tank is connected to the output port of the air compressor.

[0012] Furthermore, it also includes a control system, which includes a PLC controller that controls the pulse valve, the first solenoid valve, and the second solenoid valve respectively.

[0013] Furthermore, the PLC controller controls the pulse valve and the first solenoid valve to open, and the second solenoid valve to close, forming a first pulse gas at the outlet of the first gas outlet pipe, with a pulse duration of 60~120s; the PLC controller controls the pulse valve and the second solenoid valve to open, and the first solenoid valve to close, forming a second pulse gas at the outlet of the second gas outlet pipe, with a pulse duration of 60~120s; the time from the stop of the first pulse gas supply to the start of the second pulse gas supply or from the stop of the second pulse gas supply to the start of the first pulse gas supply is 30~120s.

[0014] A pulse aeration method, using a pulse aeration device, specifically includes the following steps: Step 1: Start the air compressor to bring the gas pressure in the storage tank up to the process requirements; Step 2: The control system controls the pulse unit to generate the set first pulse gas and second pulse gas according to the set pulse period; Step 3: The first pulse gas enters the front chamber of the aeration gas through the first air inlet pipe and flushes the MBR membrane module in front of it through several front aeration holes; the second pulse gas enters the rear chamber of the aeration gas through the second air inlet pipe and flushes the MBR membrane module behind it through several rear aeration holes.

[0015] Compared with the prior art, the beneficial effects of the present invention are: The pulse aeration device and method provided in this invention generate two pulsed gases with set pulse duration, interval, and corresponding sequence through a pulse unit. The gas is periodically and alternately sprayed at high speed from the front and rear aeration holes to flush the membrane module. The resulting reaction force causes the aeration gas to oscillate around the upper rotation axis. The periodically oscillating aeration gas pushes the MBR membrane module in front or behind to move, causing the MBR membrane module to produce alternating pulsating deformation. This causes the contact position and contact area of ​​impurities on the membrane surface to change continuously, making it easier to shake off impurities attached to the membrane surface. This effectively reduces impurities adhering to the membrane surface, reduces membrane fouling, increases the utilization efficiency of the MBR membrane module, reduces backwashing interval time, and saves aeration volume and energy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the pulse aeration device according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the rotating body structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the longitudinal section of the aeration gas parallel to the water flow direction in an embodiment of the present invention; Figure 4 This is a schematic diagram of the longitudinal section of the aeration gas perpendicular to the water flow direction in an embodiment of the present invention; Figure 5This is a schematic diagram of the pulse unit structure; Figure 6 This is a schematic diagram of the top plate (bottom plate) in an embodiment of the present invention.

[0017] The labels in the attached diagram are as follows: 1-Rotating body, 101-First bearing, 102-Rotating shaft, 103-Fixing hole, 104-Second bearing, 2-Aeration gas, 201-Front chamber, 202-Front plate, 203-Front aeration hole, 204-Side aeration hole, 205-Baffle plate, 206-Rear chamber, 207-Lower scraper, 208-Rear plate, 209-Rear aeration hole, 210-Upper scraper, 211-First air inlet pipe, 212-Second air inlet pipe, 213-Connector, 3-Top plate, 4-MBR membrane module, 5-Fixing rod, 6-Bottom plate, 7-Storage tank, 8-Pulse valve, 9-First solenoid valve, 10-First air outlet pipe, 11-Second solenoid valve, 12-Second air outlet pipe. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 As shown, a pulse aeration device is installed at the bottom of an aeration tank, comprising: a rotating body 1, aeration gas 2, a top plate 3, an MBR membrane module 4, a bottom plate 6, and a pulse unit. The MBR membrane module 4 is a curtain-type membrane and there are several of them, arranged in a rectangular array. The several MBR membrane modules 4 are respectively installed between the top plate 3 and the bottom plate 6. The rotating body 1 and the aeration gas 2 are respectively arranged in a one-to-one correspondence. The several aeration gas 2 are respectively embedded between the several MBR membrane modules 4. The upper ends of the several aeration gas 2 are rotatably connected to the top plate 3 through the several rotating bodies 1. The rotation axis of the aeration gas 2 is perpendicular to the water flow direction. The pulse unit is used to periodically supply pulse gas to the several aeration gas 2 and to make the aeration gas 2 periodically swing and flush the MBR membrane modules 4 on both sides of its front and rear sides.

[0020] It also includes: fixing rods 5, of which several fixing rods 5 are provided, and the top plate 3 is fixedly installed on the top of the bottom plate 6 by several fixing rods 5; several fixing rods 5 are located on the outermost side of the MBR membrane module 4; the bottom plate 6 is placed on the bottom of the aeration tank.

[0021] like Figure 6 As shown, mounting bodies are provided on the lower end face of the top plate 3 and the upper end face of the bottom plate 6, and they are provided one-to-one; several MBR membrane modules 4 are installed between the top plate 3 and the bottom plate 6 through the upper and lower mounting bodies; the tightness of the MBR membrane modules 4 is adapted to the preset angle of the swing of the aeration gas 2.

[0022] like Figure 2As shown, the rotating body 1 includes: a first bearing 101, a rotating shaft 102, and a second bearing 104. The first bearing 101 and the second bearing 104 are coaxially spaced apart. The first bearing 101 and the second bearing 104 are respectively located on the left and right sides of the top of the top plate 3. The two ends of the rotating shaft 102 are respectively mounted on the first bearing 101 and the second bearing 104. The top of the aeration gas 2 is fixedly mounted in the middle of the rotating shaft 102.

[0023] The aeration gas 2 includes an aeration gas body and a connecting body 213. The connecting body 213 is fixedly connected to the top of the aeration gas body. A fixing hole 103 is opened in the middle of the rotating shaft 102. The connecting body 213 passes through and is fixedly connected in the fixing hole 103. When the aeration gas 2 is subjected to a certain reaction force parallel to the direction of water flow, the aeration gas 2 rotates around the rotating shaft 102.

[0024] like Figure 3 and Figure 4 As shown, the aeration gas body includes: a front plate 202, a partition plate 205, a rear plate 208, a first air inlet pipe 211, a second air inlet pipe 212, an upper plate, a lower plate, a left side plate, and a right side plate; the front plate 202 is a forward-protruding arc-shaped plate, the rear plate 208 is a rearward-protruding arc-shaped plate, and the upper plate, lower plate, left side plate, and right side plate are all planar plates. The front plate 202, rear plate 208, upper plate, lower plate, left side plate, and right side plate form a dense, drum-shaped structure. A closed cavity is formed, with partitions 205 positioned between the upper and lower plates and between the left and right side plates, dividing the sealed cavity into a front cavity 201 and a rear cavity 206. The front plate 202 is densely covered with several front aeration holes 203 communicating with the front cavity 201, and the rear plate 208 is densely covered with several rear aeration holes 209 communicating with the rear cavity 206. The diameters of the front aeration holes 203 and the rear aeration holes 209 are both 0.1~0.5mm. Because the front plate 202 and the rear plate 206... Plate 208 is arc-shaped, and the axes of the front and rear aeration holes point to the center of the arc. Therefore, the sprayed gas acts obliquely on the membrane surface, making it easier for impurities on the membrane surface to fall off and causing corresponding deformation, improving the scouring effect and reducing membrane fouling. The first air inlet pipe 211 and the second air inlet pipe 212 are vertically penetrating and fixedly connected to the front and rear sides of the upper plate, respectively. The first air inlet pipe 211 and the second air inlet pipe 212 are connected to the front cavity 201 and the rear cavity 206, respectively. The inlet ends of the first air inlet pipe 211 and the second air inlet pipe 212 are connected to the pulse gas outlet of the pulse unit, respectively. When the aeration gas 2 is installed, it makes full contact between the inner MBR membrane module 4 and the aeration gas 2. When the aeration gas 2 swings back and forth to squeeze the MBR membrane module 4, the arc-shaped surface is conducive to the full and smooth contact of the MBR membrane module 4, causing the MBR membrane module 4 to deform more in the height direction, which is conducive to the falling off of impurities on the membrane surface.

[0025] The bottom of the lower plate of the aeration gas body is equipped with a counterweight to ensure that when the aeration gas is in an inclined state (with zero speed), the aeration gas 2 generates a reverse rotational motion.

[0026] The distance between the lower end of the aeration gas 2 and the upper end of the bottom plate 6 is 100-400mm, and the distance between the upper end of the aeration gas 2 and the lower end of the top plate 3 is 500-800mm.

[0027] The aeration gas body also includes two lower scraper bars 207 and two upper scraper bars 210. The two lower scraper bars 207 are symmetrically and horizontally fixedly connected to the lower part of the opposite ends of the left and right side plates, respectively. The two upper scraper bars 210 are symmetrically and horizontally fixedly connected to the upper part of the opposite ends of the left and right side plates, respectively. The lower scraper bars 207 and upper scraper bars 210 are arranged parallel to each other. The leading edges of the upper scraper bars 210 and lower scraper bars 207 are flush with or extend beyond the outer surface of the front plate 202; the trailing edges are flush with or extend beyond the outer surface of the rear plate 208. When the aeration gas body 2 swings left and right, the body drives the upper and lower scraper bars to swing synchronously. The upper and lower scraper bars, at different heights at the top and bottom, respectively, squeeze more MBR membrane modules 4 on both sides, causing more membranes to deform and more impurities on the membrane surface to fall off, effectively reducing membrane fouling. The distance between the outer edges of the upper and lower scrapers on both sides is 300-800 mm smaller than the width of the overall MBR membrane module 4. When the aeration gas 2 swings, it can cause more deformation of the MBR membrane module 4, increasing the probability of impurities falling off the membrane surface.

[0028] The distance h1 between the upper scraper 210 and the top of the aeration gas 2 is 200-400mm, and the distance h2 between the lower scraper 207 and the bottom of the aeration gas 2 is 200-400mm. Setting a smaller distance is beneficial for more impurities to fall off in the height direction.

[0029] The left and right side plates are densely covered with a number of side aeration holes 204, each with a diameter of 0.1–0.5 mm. High-speed gas flows through the side aeration holes 204 to flush the membrane along the entire height of both sides of the cavity. As the aeration gas 2 oscillates around the upper rotating shaft 102, the side aeration holes 204 dynamically flush the MBR membrane modules 4 on both sides, which is more effective than the static flushing in the prior art.

[0030] like Figure 5As shown, the pulse unit includes: a storage tank 7, a connecting pipe, a pulse valve 8, a first solenoid valve 9, a first air outlet pipe 10, a second solenoid valve 11, and a second air outlet pipe 12. One end of the connecting pipe is connected to the inner cavity of the storage tank 7. The pulse valve 8 is installed on the connecting pipe. One end of the first air outlet pipe 10 and the second air outlet pipe 12 are respectively connected to the other end of the connecting pipe. The first solenoid valve 9 and the second solenoid valve 11 are respectively installed on the first air outlet pipe 10 and the second air outlet pipe 12. The other ends of the first air outlet pipe 10 and the second air outlet pipe 12 are respectively connected to the first air inlet pipe 211 and the second air inlet pipe 212. The storage tank 7 is connected to the output port of the air compressor.

[0031] It also includes a control system, which includes a PLC controller that controls the pulse valve 8, the first solenoid valve 9, and the second solenoid valve 11 respectively. The control system is used to adjust the pulse period and duration of the gas in the pulse unit to adjust the different oscillation periods, deformation amounts, and the optimal removal effect of impurities on the membrane surface.

[0032] The PLC controller controls pulse valve 8 and the first solenoid valve 9 to open, and the second solenoid valve 11 to close, forming a first pulse gas at the outlet of the first outlet pipe 10. The pulse duration of the first pulse gas is T1 = 60~120s. The PLC controller also controls pulse valve 8 and the second solenoid valve 11 to open, and the first solenoid valve 9 to close, forming a second pulse gas at the outlet of the second outlet pipe 12. The pulse duration of the second pulse gas is T2 = 60~120s. The time from the cessation of the first pulse gas supply to the start of the second pulse gas supply, or vice versa, is T3 = 30~120s. In other words, the first and second pulse gases operate alternately with the same cycle. The time allocation is as follows: the first pulse gas continuously supplies the front chamber for time T1, then stops supplying; after time T3, the second pulse gas begins supplying the rear chamber, lasting for time T2, then stops supplying; after time T3, the first pulse gas resumes supplying the front chamber, completing one cycle of gas supply.

[0033] When both the first pulse gas and the second pulse gas stop supplying gas, the first solenoid valve 9 and the second solenoid valve 11 are both closed.

[0034] When the first pulse gas is continuously supplied to the front chamber 201 (T1 continuous gas supply stage), and the second pulse gas is not introduced into the rear chamber 206, the gas is injected at high speed from the front aeration hole 203 into the MBR membrane module 4 and the water. The reaction force acting on the front plate 202 causes the aeration gas 2 to rotate backward around the rotation axis 102 by a preset angle α and maintain it continuously. The preset angle α is determined comprehensively based on factors such as gas injection speed, the number and arrangement density of the front aeration holes, the area of ​​the front plate, and the weight and distribution of the aeration gas. Preferably, α = 1~8°. When the aeration gas 2 rotates backward, it causes the rear MBR membrane module 4 to deform backward. The deformation at the bottom is greater than the deformation at the top. The inner MBR membrane module 4 continuously pushes the outer MBR membrane module 4 behind, causing more MBR membrane modules 4 to deform. As the deformation angle and deformation amount continuously increase, impurities on the membrane surface are continuously detached, effectively reducing membrane fouling.

[0035] When the first pulse gas stops supplying gas to the front chamber 201, and the second pulse gas has not yet started supplying gas to the rear chamber 206 (i.e., the first T3 stage where no gas is supplied), gas flows out from the front aeration hole 203, and its velocity rapidly decreases to zero. The reaction force acting on the front plate 202 also rapidly decreases to zero. The aeration gas 2, in an inclined state (the angle between the axis of symmetry and the vertical axis is α), rapidly rotates forward in the opposite direction under the action of gravity. The angle between the aeration gas 2 and the vertical axis gradually decreases from the preset angle α. When the axis of symmetry of the aeration gas 2 is vertical, the rotation angle is equal to zero. At this time, the aeration gas 2 continues to rotate forward at a certain angle under the action of inertial force. When the velocity of the aeration gas 2 is equal to zero, the aeration gas 2 begins to rotate in the opposite direction (backward) under the action of gravity. This oscillation is repeated several times, and the oscillation amplitude of the aeration gas 2 gradually decreases to zero.

[0036] When the aeration gas 2, tilted at a certain angle, rotates forward around the rotation axis 102 under the action of gravity, the MBR membrane module 4 behind the aeration gas 2, which has already deformed, rebounds under the action of elastic force, and its deformation gradually decreases to zero. The process of the continuous decrease in deformation is equivalent to the MBR membrane module 4 undergoing the opposite deformation on the basis of its original deformation. The continuous decrease in deformation causes the contact position and contact area of ​​impurities on the membrane surface to change continuously, making it easier for impurities on the membrane surface to fall off, thus further reducing membrane fouling. When the axis of symmetry of the aeration gas 2 returns to a vertical state, it continues to rotate forward under the action of inertial force. The aeration gas 2 drives the MBR membrane module 4 in front to deform forward, with the deformation at the bottom being greater than that at the top. The inner MBR membrane module 4 continuously pushes the outer MBR membrane module 4 in front, causing more MBR membrane modules 4 to deform. As the deformation angle and deformation amount continuously increase, impurities on the membrane surface continuously fall off, effectively reducing membrane fouling. When the rotational speed of the aeration gas 2 drops to zero, and the aeration gas 2 begins to rotate backward under the action of gravity, the MBR membrane module 4, which is deformed in front of the aeration gas 2, also rebounds under the action of elastic force. Its deformation gradually decreases to zero. The process of the deformation continuously decreasing is equivalent to the MBR membrane module 4 forming the opposite deformation on the basis of the original deformation in the opposite direction. The continuous decrease in deformation causes the contact position and contact area of ​​impurities on the membrane surface to change continuously, making it easier for impurities on the membrane surface to fall off, thereby further reducing membrane fouling. When the axis of symmetry of the aeration gas 2 is vertical, the aeration gas continues to rotate backward at a certain angle under the action of inertial force. The aeration gas 2 causes the MBR membrane module 4 behind it to deform backward (the deformation amount is less than the first time). This swinging motion is repeated for several rounds, causing the deformation amount of the MBR membrane module 4 behind the aeration gas 2 to gradually increase and then gradually decrease; the deformation amount of the MBR membrane module 4 in front of it to gradually increase and then gradually decrease; the deformation amount of the MBR membrane module 4 behind it to gradually increase and then gradually decrease again... This cycle repeats for several rounds. In each round, the deformation amount of the membrane gradually decreases, causing the membrane to continuously deform and reverse deform. The process of the deformation amount continuously decreasing and increasing and the deformation direction continuously changing causes the contact position and contact area of ​​impurities on the membrane surface to continuously change, making it easier for impurities on the membrane surface to fall off, thus further reducing membrane fouling.

[0037] When gas is introduced into the rear chamber 206 while no gas is introduced into the front chamber 201 (T2 continuous gas supply stage), air is injected at high speed from the rear aeration holes 209 into the rear MBR membrane module 4 and the water. The reaction force acting on the rear plate 208 causes the aeration gas 2, which is already in a static state, to rotate forward around the rotation axis 102 by a preset angle β and maintain this angle. The preset angle β is determined comprehensively based on factors such as the gas injection speed, the number and arrangement density of the rear aeration holes, the area of ​​the rear plate, and the weight and distribution of the aeration gas. Preferably, β = 2 to 8°. When the aeration gas 2 rotates forward, it causes the MBR membrane module 4 in front to deform forward, with the lower deformation being greater than the upper deformation. The inner MBR membrane module 4 continuously pushes the outer MBR membrane module 4 in front, causing more MBR membrane modules 4 to deform. As the deformation angle and deformation amount continuously increase, impurities on the membrane surface are continuously detached, effectively reducing membrane fouling.

[0038] When the second pulse gas stops supplying gas to the rear chamber 206, and the first pulse gas has not yet supplied gas to the front chamber 201 (i.e., the second T3 stage where no gas is supplied), gas flows out from the rear aeration hole 209, and its velocity rapidly decreases to zero. The reaction force acting on the aeration gas 2 also rapidly decreases to zero. The aeration gas 2, which is in an inclined state (the angle between the axis of symmetry and the vertical axis is β), rapidly rotates backward under the action of gravity. The angle between the rotation angle and the vertical axis gradually decreases from the preset angle β. When the axis of symmetry of the aeration gas 2 is vertical, the rotation angle is equal to zero. Under the action of inertial force, the aeration gas 2 continues to rotate backward at a certain angle. When the velocity of the aeration gas 2 is equal to zero, the aeration gas 2 begins to rotate in the opposite direction (forward) under the action of gravity. This oscillation is repeated several times, and the oscillation angle of the aeration gas 2 gradually decreases to zero.

[0039] When the aeration gas 2, tilted at a certain angle, rotates backward around the rotation axis 102 under the action of gravity, the deformed MBR membrane module 4 in front of the aeration gas 2 rebounds under the action of elastic force, and its deformation gradually decreases to zero. The process of the continuous decrease in deformation is equivalent to the MBR membrane module 4 undergoing the opposite deformation on the basis of its original deformation. The continuous decrease in deformation causes the contact position and contact area of ​​impurities on the membrane surface to change continuously, making it easier for impurities on the membrane surface to fall off, thus further reducing membrane fouling. When the axis of symmetry of the aeration gas 2 returns to a vertical state, it continues to rotate backward under the action of inertial force. The aeration gas 2 drives the MBR membrane module 4 behind it to deform backward. The deformation at the bottom is greater than that at the top. The inner MBR membrane module 4 continuously pushes the outer MBR membrane module 4 behind it, causing more MBR membrane modules 4 to deform. As the deformation angle and deformation amount continuously increase, impurities on the membrane surface continuously fall off, effectively reducing membrane fouling. When the rotational speed of the aeration gas 2 drops to zero, and the aeration gas 2 begins to rotate forward again under the action of gravity, the MBR membrane module 4 deformed behind the aeration gas 2 also rebounds under the action of elastic force, and its deformation gradually decreases to zero. The process of the deformation continuously decreasing is equivalent to the MBR membrane module 4 forming the opposite deformation on the basis of the original deformation in the opposite direction. The continuous decrease in deformation causes the contact position and contact area of ​​impurities on the membrane surface to change continuously, thereby making it easier for impurities on the membrane surface to fall off, and further reducing membrane fouling. When the axis of symmetry of the aeration gas 2 is vertical, the aeration gas 2 continues to rotate forward at a certain angle under the action of inertial force. The aeration gas 2 then causes the MBR membrane module 4 in front to deform forward (the amount of deformation is less than the first time). This oscillation is repeated several times, causing the deformation of the MBR membrane module 4 in front of the aeration gas 2 to gradually increase and then decrease; the deformation of the MBR membrane module 4 behind it to gradually increase and then decrease; the deformation of the MBR membrane module 4 in front to gradually increase and then decrease again... This cycle repeats several times. In each round, the deformation of the membrane gradually decreases, causing the membrane to continuously deform and reverse. The continuous decrease and increase of deformation and the continuous change of deformation direction cause the contact position and contact area of ​​impurities on the membrane surface to continuously change, making it easier for impurities on the membrane surface to fall off, thus further reducing membrane fouling.

[0040] A pulse aeration method specifically includes the following steps: 1. Start the air compressor to bring the gas pressure in storage tank 7 up to the process requirements; 2. The control system controls the pulse unit to generate the set first pulse gas, second pulse gas, and corresponding states where neither is supplied with gas, according to the set pulse cycle. 3. According to the set pulse period T = T1 + T3 + T2 + T3: 3.1, T1 stage: The first pulse gas is continuously supplied to the front chamber 201, while the second pulse gas is not introduced into the rear chamber 206. The gas is sprayed at high speed from the front aeration hole 203 into the MBR membrane module 4 and the water in front. The reaction force acting on the front plate 202 causes the aeration gas 2 to rotate backward around the rotation axis 102 by a preset angle α and maintain it. When the aeration gas 2 rotates backward, it causes the rear MBR membrane module 4 to deform backward. The inner MBR membrane module 4 continuously pushes the outer MBR membrane module 4 behind, causing more MBR membrane modules 4 to deform. As the deformation angle and deformation amount continuously increase, impurities on the membrane surface are continuously detached, effectively reducing membrane fouling.

[0041] 3.2 First T3 stage: The first pulse gas stops supplying gas to the front chamber 201, and at the same time, the second pulse gas has not yet started supplying gas to the rear chamber 206. Gas flows out from the front aeration hole 203, and its speed rapidly decreases to zero. The reaction force acting on the front plate 202 also rapidly decreases to zero. The inclined aeration gas 2 rotates rapidly forward in the opposite direction under its gravity. The angle between the aeration gas 2 and the vertical axis gradually decreases from the preset angle α. When the axis of symmetry of the aeration gas 2 is vertical, the rotation angle is equal to zero. Under the action of inertial force, the aeration gas 2 continues to rotate forward at a certain angle. When the speed of the aeration gas 2 is equal to zero, the aeration gas 2 begins to rotate in the opposite direction (backward) under the action of gravity. This oscillation is repeated for several rounds, and the oscillation amplitude of the aeration gas 2 gradually decreases to zero.

[0042] 3.3, T2 stage: The second pulse gas is continuously supplied to the rear chamber 206, while the first pulse gas is not introduced into the front chamber 201. The gas is sprayed at high speed from the rear aeration hole 209 to the rear MBR membrane module 4 and the water. The reaction force acting on the rear plate 208 causes the aeration gas 2, which is already in a static state, to rotate forward around the rotation axis 102 by a preset angle β and maintain it. When the aeration gas 2 rotates forward, it causes the front MBR membrane module 4 to deform forward. The inner MBR membrane module 4 continuously pushes the front outer MBR membrane module 4, causing more MBR membrane modules 4 to deform. As the deformation angle and deformation amount continuously increase, impurities on the membrane surface are continuously detached, effectively reducing membrane fouling.

[0043] 3.4 Second T3 stage: The second pulse gas stops supplying gas to the rear chamber 206, while the first pulse gas has not yet started supplying gas to the front chamber 201. Gas flows out from the rear aeration hole 209, and its velocity rapidly decreases to zero. The reaction force acting on the aeration gas 2 also rapidly decreases to zero. The tilted aeration gas 2 rotates rapidly to the rear under its own gravity. The angle between the rotation angle and the vertical axis gradually decreases from the preset angle β. When the axis of symmetry of the aeration gas 2 is vertical, the rotation angle is equal to zero. At this time, the aeration gas 2 continues to rotate to the rear at a certain angle under the action of inertial force. When the velocity of the aeration gas 2 is equal to zero, the aeration gas 2 begins to rotate in the opposite direction (towards) under the action of gravity. This swinging motion is repeated for several rounds, and the swing angle of the aeration gas 2 gradually decreases to zero.

[0044] 4. The control system controls the pulse unit to execute the second, third... pulse cycles. In the description of this invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", "top / bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent substitutions, and improvements made by those skilled in the art to the above embodiments without departing from the scope of the technical solution of the present invention, based on the technical essence of the present invention, shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. A pulse aeration device, installed at the bottom of an aeration tank, characterized in that, include: The system comprises a rotating body (1), an aeration gas (2), a top plate (3), an MBR membrane module (4), a bottom plate (6), and a pulse unit. The MBR membrane module (4) is a curtain-type membrane and there are several of them. The several MBR membrane modules (4) are arranged in a rectangular array. The several MBR membrane modules (4) are respectively installed between the top plate (3) and the bottom plate (6). The rotating body (1) and the aeration gas (2) are respectively provided in several units. The several aeration gas (2) are respectively embedded between the several MBR membrane modules (4). The upper ends of the several aeration gas (2) are respectively rotatably connected to the top plate (3) through the several rotating bodies (1). The rotation axis of the aeration gas (2) is perpendicular to the direction of water flow. The pulse unit is used to periodically supply pulse gas to the several aeration gas (2) and make the aeration gas (2) periodically swing and flush the MBR membrane modules (4) on both sides.

2. The pulse aeration device according to claim 1, characterized in that: Also includes: The top plate (3) is fixedly installed on the top of the bottom plate (6) by means of several fixing rods (5); several fixing rods (5) are located on the outermost side of the MBR membrane module (4); the bottom plate (6) is placed on the bottom of the aeration tank.

3. The pulse aeration device according to claim 1, characterized in that: The rotating body (1) includes: a first bearing (101), a rotating shaft (102), and a second bearing (104). The first bearing (101) and the second bearing (104) are coaxially spaced apart. The first bearing (101) and the second bearing (104) are respectively located on the left and right sides of the top of the top plate (3). The two ends of the rotating shaft (102) are respectively mounted on the first bearing (101) and the second bearing (104). The top of the aeration gas (2) is fixedly mounted in the middle of the rotating shaft (102).

4. The pulse aeration device according to claim 3, characterized in that: The aeration gas (2) includes an aeration gas body and a connector (213). The connector (213) is fixedly connected to the top of the aeration gas body. A fixing hole (103) is provided in the middle of the rotating shaft (102). The connector (213) passes through and is fixedly connected in the fixing hole (103).

5. A pulse aeration device according to claim 4, characterized in that: The aeration body includes: a front plate (202), a partition (205), a rear plate (208), a first air inlet pipe (211), a second air inlet pipe (212), an upper plate, a lower plate, a left side plate, and a right side plate; the front plate (202) is a forward-protruding arc-shaped plate, the rear plate (208) is a rearward-protruding arc-shaped plate, and the upper plate, lower plate, left side plate, and right side plate are all planar plates. The front plate (202), rear plate (208), upper plate, lower plate, left side plate, and right side plate form a waist-drum-shaped sealed cavity. The partition (205) is located between the upper plate and the lower plate and between the left side plate and the right side plate, dividing the sealed cavity into a front cavity (211). 01) and rear cavity (206), the front plate (202) is densely covered with a number of front aeration holes (203) connected to the front cavity (201), and the rear plate (208) is densely covered with a number of rear aeration holes (209) connected to the rear cavity (206); the first air inlet pipe (211) and the second air inlet pipe (212) are vertically penetrating and fixedly connected to the front and rear sides of the upper plate, the first air inlet pipe (211) and the second air inlet pipe (212) are respectively connected to the front cavity (201) and the rear cavity (206), and the inlet ends of the first air inlet pipe (211) and the second air inlet pipe (212) are respectively connected to the pulse gas outlet of the pulse unit.

6. A pulse aeration device according to claim 5, characterized in that: The aeration body further includes: a lower scraper (207) and an upper scraper (210). There are two lower scrapers (207) and two upper scrapers (210). The two lower scrapers (207) are symmetrically and horizontally fixedly connected to the lower part of the opposite ends of the left and right side plates, and the two upper scrapers (210) are symmetrically and horizontally fixedly connected to the upper part of the opposite ends of the left and right side plates. The lower scrapers (207) and the upper scrapers (210) are arranged in parallel. The left and right side plates are densely covered with a number of side aeration holes (204).

7. A pulse aeration device according to claim 6, characterized in that: The pulse unit includes: a storage tank (7), a connecting pipe, a pulse valve (8), a first solenoid valve (9), a first air outlet pipe (10), a second solenoid valve (11), and a second air outlet pipe (12). One end of the connecting pipe is connected to the inner cavity of the storage tank (7). The pulse valve (8) is installed on the connecting pipe. One end of the first air outlet pipe (10) and the second air outlet pipe (12) are respectively connected to the other end of the connecting pipe. The first solenoid valve (9) and the second solenoid valve (11) are respectively installed on the first air outlet pipe (10) and the second air outlet pipe (12). The other end of the first air outlet pipe (10) and the second air outlet pipe (12) are respectively connected to the first air inlet pipe (211) and the second air inlet pipe (212). The storage tank (7) is connected to the output port of the air compressor.

8. A pulse aeration device according to claim 7, characterized in that: Also includes: The control system includes a PLC controller, which controls the pulse valve (8), the first solenoid valve (9), and the second solenoid valve (11).

9. A pulse aeration device according to claim 8, characterized in that: The PLC controller controls the pulse valve (8) and the first solenoid valve (9) to open and the second solenoid valve (11) to close, forming a first pulse gas at the outlet of the first gas outlet pipe (10), with a pulse duration of 60~120s; the PLC controller controls the pulse valve (8) and the second solenoid valve (11) to open and the first solenoid valve (9) to close, forming a second pulse gas at the outlet of the second gas outlet pipe (12), with a pulse duration of 60~120s; the time from when the first pulse gas stops supplying gas to when the second pulse gas starts supplying gas or from when the second pulse gas stops supplying gas to when the first pulse gas starts supplying gas is 30~120s.

10. A pulse aeration method, using the pulse aeration device according to any one of claims 1 to 9, characterized in that: Specifically, the following steps are included: Step 1: Start the air compressor to bring the gas pressure in the storage tank (7) up to the process requirements; Step 2: The control system controls the pulse unit to generate the set first pulse gas and second pulse gas according to the set pulse period; Step 3: The first pulse gas enters the front chamber (201) of the aeration gas (2) through the first air inlet pipe (211) and flushes the MBR membrane module (4) in front of it through several front aeration holes (203); the second pulse gas enters the rear chamber (206) of the aeration gas (2) through the second air inlet pipe (212) and flushes the MBR membrane module (4) behind it through several rear aeration holes (209).

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