High-efficiency low-energy-consumption membrane bioreactor wastewater treatment device

Abstract

The invention discloses a high-efficiency low-energy-consumption membrane bioreactor wastewater treatment device which comprises a wastewater tank and an aeration tank, a membrane separation mechanism is rotatably mounted in the wastewater tank, a T-shaped connecting plate is fixedly mounted on the upper surface in the aeration tank, and an aeration mixing mechanism is fixedly mounted on the upper surface of the T-shaped connecting plate; the aeration mixing mechanism can generate tiny bubbles through aeration, flotation is achieved through the hydrophobic adsorption effect of the bubbles and solid particles, then the solid particles in the permeate liquid can float to the surface of the permeate liquid together through the bubbles, and the solid particles floating to the surface of the permeate liquid can be captured by the fishing mechanism in a rotary mode. Through the design of the membrane separation mechanism, the microporous membrane is driven to rotate through the lining plate, the membrane surface can be continuously updated to participate in separation, and the situation that solid particles are accumulated on the membrane surface to form filtering resistance is avoided, so that the wastewater is pushed to be filtered without increasing the pressure of a water pump, and the energy consumption of power equipment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly to a high-efficiency and low-energy consumption membrane bioreactor wastewater treatment device. Background Technique

[0002] The MBR membrane bioreactor is a new type of wastewater treatment system produced by the organic combination of membrane separation technology and biological treatment technology. It replaces the secondary sedimentation tank at the end of the traditional biological treatment technology with a membrane module. While using microorganisms to biologically transform the reaction substrate, it separates the reaction products and intercepts organisms through the membrane module. It not only solves the problems of large sludge production and difficult sludge treatment in traditional sewage treatment processes, but also reduces the floor area of sewage treatment facilities because it eliminates the secondary sedimentation tank in the traditional process.

[0003] For example, Chinese Patent with the publication number CN203976478U discloses a low-energy consumption anaerobic-aerobic circulation integrated wastewater treatment device, including an inlet, a sewage treatment system, a control room, and a drain outlet. The inlet is connected to the sewage treatment system, the sewage treatment system is connected to the control room, and the drain outlet is arranged at the lower part of the control room. The sewage treatment system includes an anaerobic reaction chamber and an aerobic reaction chamber. A partition is arranged between the anaerobic reaction chamber and the aerobic reaction chamber. An opening is arranged at the lower end of the partition to connect the anaerobic reaction chamber and the aerobic reaction chamber. A reflux pipe is arranged at the upper part of the partition to connect the aerobic reaction chamber and the inlet channel. An MBR membrane bioreactor is arranged at the lower part of the aerobic reaction chamber. An air delivery pipe is arranged at the lower part of the MBR membrane bioreactor to connect the blower in the control room. A drain pipe is arranged at the upper part of the MBR membrane bioreactor to connect the water pump in the control room. The utility model works stably, greatly saves energy, improves the wastewater treatment efficiency, and reduces the economic consumption.

[0004] However, in the above low-energy consumption anaerobic-aerobic circulation integrated wastewater treatment device, during the process of filtering wastewater, a water pump is needed to press and filter the wastewater from the surface of the microporous membrane, and the remaining solid particles will adhere to the surface of the microporous membrane. As the solid particles remain on the surface of the microporous membrane, the filtration resistance will continuously increase. In order to maintain a certain filtration rate, it is necessary to continuously increase the energy consumption of the water pump to increase the water pressure, which will further lead to an increase in operating costs and cannot improve the filtration efficiency of wastewater while saving energy. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-efficiency and low-energy consumption membrane bioreactor wastewater treatment device to solve the problem of not being able to improve the filtration efficiency of wastewater while saving energy as proposed in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A high-efficiency and low-energy consumption membrane bioreactor wastewater treatment device, comprising: a wastewater tank and an aeration tank, wherein one end of the wastewater tank is connected and installed with a ball valve, and the ball valve can be connected with an external wastewater pipe, and a membrane separation mechanism is rotatably installed in the wastewater tank, and a drainage end of the membrane separation mechanism penetrates from one end of the wastewater tank into the aeration tank, so that the membrane separation mechanism can separate solids and liquids in the wastewater, and then let the filtered water become permeate and flow into the aeration tank again through the drainage end for secondary treatment, and the separation end of the membrane separation mechanism will rotate together during the solid-liquid separation of the wastewater, so that the separation end that is not covered by solid particles can continuously separate the wastewater, thereby avoiding a large filtration resistance of the wastewater passing through the membrane, so that it can achieve solid-liquid separation at a lower pressure, thereby reducing the energy consumption for driving the water flow through the membrane;

[0008] A T-shaped connecting plate is fixedly installed on the upper surface of the aeration tank, and an aeration mixing mechanism is fixedly installed on the upper surface of the T-shaped connecting plate. The aeration mixing mechanism can inject oxygen into the aeration tank to allow these tiny bubbles to generate strong disturbance and mixing effects with the surrounding permeate during the rising process, and generate tiny bubbles through aeration, and utilize the hydrophobic adsorption effect of bubbles and solid particles to achieve flotation, so that the solid particles in the permeate can float to the surface of the permeate together with the bubbles, and the solid particles floating on the surface of the permeate can be captured by the salvage mechanism in a rotational manner to dump them into the collection chamber, and the collection chamber is fixedly installed at one end of the wastewater tank.

[0009] Preferably, the membrane separation mechanism comprises a trapezoidal block, which is fixedly installed in the wastewater tank, one end of the trapezoidal block is provided with an annular groove in an embedded manner, a U-shaped drainage plate is suspended in the center of the annular groove, the U-shaped drainage plate is fixedly installed at one end of the wastewater tank, both ends of the outer surface of the U-shaped drainage plate are rotatably installed with rings, and a backing plate is fixedly installed between two groups of the rings, the backing plate is formed into a ring shape by connecting multiple groups of triangular frames, and a microporous membrane is attached to the outer surface of the backing plate.

[0010] Preferably, a connecting ring is fixedly installed at one end of one group of the rings, and the connecting ring is rotatably installed in the ring groove and fixedly connected to the output shaft of the first motor, and the first motor is fixedly installed in the trapezoidal block, so that the lining plate can drive the microporous membrane attached to the outer surface to rotate through the ring.

[0011] Preferably, a U-shaped sealing hopper is sleeved on the lower half of the outer surface of the lining plate. The U-shaped sealing hopper is fixedly installed in the wastewater tank, so that the lining plate can drive the microporous membrane on the outer surface to abut against the inner ring surface of the U-shaped sealing hopper, so as to realize that only the upper half of the lining plate can allow wastewater to flow into the U-shaped drainage plate through the microporous membrane. The lower half of the lining plate rotated into the U-shaped sealing hopper can be sealed, and the solid particles remaining after the wastewater passes through will stay in the triangular clamping groove formed between the lining plates. When it is driven to rotate, the solid particles can be poured into the U-shaped sealing hopper, and the solid particles fall into the funnel cylinder through the discharge port communicated with the lower surface of the U-shaped sealing hopper. The discharge port penetrates through the bottom of the wastewater tank, and the funnel cylinder is communicated and installed on the lower surface of the wastewater tank.

[0012] Preferably, one end of the U-shaped drainage plate is communicated and installed with a solenoid valve. One end of the solenoid valve is communicated and installed with a water outlet pipe, and the water outlet pipe penetrates from one end of the wastewater tank into the aeration tank.

[0013] Preferably, the aeration mixing mechanism includes an air pump. The air pump is fixedly installed at one end of the upper surface of the T-shaped connecting plate. The air outlet end of the air pump is communicated and installed with a four-way pipe. Two groups of the four-way pipe are rotationally connected and communicated with two groups of stirring pipes. The stirring pipes are inserted into the output shafts of the hollow shaft reduction motors. The hollow shaft reduction motors are fixedly installed at both ends of the upper surface of the T-shaped connecting plate. Stirring blades are fixedly installed on the outer surface of the stirring pipes. When the stirring pipes are driven to rotate by the hollow shaft reduction motors, air will be injected through the air pump and discharged into the aeration tank through the air pipes. The air pipes are communicated and installed on the outer surface of the stirring pipes.

[0014] Preferably, the other group of pipes of the four-way pipe is communicated with an air knife. The air knife is fixedly installed at both ends of the outer surface of the T-shaped connecting plate, and the air outlet is inclined downward at 40°, so that the air knife can blow the surface of the permeate to generate ripples and flow towards the collection chamber.

[0015] Preferably, a liquid level sensor is fixedly installed at one end of the T-shaped connecting plate. The signal transmitting end of the liquid level sensor is connected to the signal receiving end of the controller, and the control output end of the controller is electrically connected to the electric control ends of the first motor and the solenoid valve, so that the liquid level sensor can detect and maintain the water level at the same height as the salvage mechanism;

[0016] Among them, the models of the liquid level sensor and the controller are UR and CPH respectively.

[0017] Preferably, the salvage mechanism includes a partition plate and a docking plate. The partition plate is fixedly installed at one end inside the aeration tank. A semi-circular ring is fixedly installed at the upper end of the partition plate. The docking plates are fixed on both sides inside the aeration tank, and a salvage net is rotatably installed between the two groups of docking plates. The salvage net can rotate and touch the inner ring wall of the semi-circular ring of the partition plate, so that the solid particles floating on the surface can be pushed by the wavy permeate into the semi-circular ring and picked up by the rotating salvage net.

[0018] Preferably, the salvage net is in an arc shape and is fixedly connected to the output shaft of the second motor. The second motor is fixedly installed at one end of one of the docking plates.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. Through the design of the wastewater tank, aeration tank, collection chamber, aeration mixing mechanism, salvage mechanism and membrane separation mechanism, during use, external wastewater can be introduced into the wastewater tank through a ball valve. As the wastewater enters, the membrane separation mechanism rotatably installed in the wastewater tank starts to operate. And this membrane separation mechanism uses a continuous rotation method to continuously update the membrane surface to participate in the separation of wastewater, avoiding the increase of filtration resistance caused by the accumulation of solid particles, enabling it to always achieve solid-liquid separation under low pressure, thereby reducing the energy consumed by the water pump to increase the water pressure. The filtered permeate will directly flow into the aeration tank, while the intercepted solid particles are discharged by rotation. The aeration tank is the core area of secondary treatment. The T-shaped connecting plate above bears the aeration mixing mechanism. This mechanism injects air into the aeration tank as tiny bubbles, so that during the rising process of the bubbles, it not only provides oxygen for microorganisms, but also carries solid particles to float upward through charge adsorption, and at the same time strongly disturbs and mixes the liquid to form directional ripples on the liquid surface, pushing the floating objects towards the collection chamber, reducing additional stirring equipment and energy consumption, and lowering the overall operating cost. Furthermore, the floating solid particles can be washed into the salvage mechanism from the aeration tank by the waves. The salvage mechanism will accurately capture the solid particles floating on the liquid surface by rotation and rotate to pour the solid particles into the collection chamber for centralized storage. And the captured solid particles will re-direct the permeate therein into the aeration tank during rotation, that is, the complete separation and collection of pollutants are completed.

[0021] 2. Through the design of the first motor, U-shaped sealing hopper, backing plate, solenoid valve, funnel cylinder, U-shaped drainage plate and collar, after introducing external wastewater into the wastewater tank through the ball valve, the first motor can be started to drive the backing plate to rotate on the outer surface of the U-shaped drainage plate through the collar. Furthermore, the backing plate can drive the microporous membrane attached to its outer surface to rotate together. And because the lower half of the outer surface of the backing plate is sleeved with a U-shaped sealing hopper, only the upper half of the microporous membrane can come into contact with the wastewater. Thus, under the action of gravity or the slight pressure of wastewater injection, the wastewater can permeate through the microporous membrane for solid-liquid separation. The filtered permeate will flow into the U-shaped drainage plate and, controlled by the solenoid valve, flow into the aeration tank through the water outlet pipe. The solid particles are intercepted in the triangular angle grooves formed between the backing plates. As the backing plate continues to rotate, when the part with intercepted solid particles rotates into the U-shaped sealing hopper, the solid particles fall due to gravity and can enter the funnel cylinder through the discharge port on the lower surface of the U-shaped sealing hopper, and finally be collected and discharged. Moreover, by driving the rotation of the microporous membrane through the backing plate, the membrane surface can be continuously updated to participate in the separation, avoiding the accumulation of solid particles on the membrane surface to form a filtration resistance. In this way, there is no need to increase the water pump pressure to promote wastewater filtration, reducing the energy consumption of power equipment, achieving efficient solid-liquid separation under low pressure, thereby reducing the overall operation cost. And the continuously rotating microporous membrane can continuously contact with fresh wastewater, ensuring the continuity and efficiency of the solid-liquid separation process. At the same time, the design of the U-shaped sealing hopper accurately controls the contact area between the wastewater and the membrane, enabling the filtered permeate to quickly flow into the U-shaped drainage plate, reducing the residence time of the liquid in the wastewater tank and accelerating the treatment speed.

[0022] 3. Through the design of an air pump, a four-way pipe, an air knife, a hollow shaft reduction motor, a stirring pipe, a liquid level sensor, a second motor, a salvage net, and a semi-circular ring, after the permeate flows into the aeration tank, the air pump can be started to pressurize and transport air to the four-way pipe for diversion. A part of the air enters the stirring pipe connected to the output shaft of the hollow shaft reduction motor through the four-way pipe. While the stirring pipe rotates driven by the hollow shaft reduction motor, the liquid in the aeration tank is agitated by the stirring blades outside the pipe. At the same time, the air in the pipe is discharged in the form of tiny bubbles through the air pipes installed on the outer surface. During the rising process of these bubbles, on the one hand, they provide the oxygen required for microorganisms to decompose pollutants, and on the other hand, they adsorb solid particles in the permeate by surface charge, causing them to float to the liquid surface with the bubbles. Another part of the air flows into the air knife through the four-way pipe, and the air knife blows air continuously at a downward inclination of 40° to the surface of the permeate, thereby generating a directional ripple on the liquid surface and pushing the solid particles floating on the liquid surface towards the collection chamber, creating favorable conditions for the work of salvaging solid particles. During the process of the permeate flowing into the aeration tank, the liquid level sensor therein will monitor the liquid level height in the aeration tank in real time and transmit the data signal to the controller. The controller analyzes and processes the signal according to the preset program. When the liquid level is lower than the set value, the controller sends instructions to the first motor and the solenoid valve to increase the rotation speed of the backing plate or increase the discharge flow rate of the permeate to supplement the liquid in the aeration tank. When the liquid level is higher than the set value, the rotation of the backing plate is slowed down or the discharge of the permeate is reduced to ensure that the water level is always flush with the working height of the semi-circular ring, guaranteeing the salvage effect. Subsequently, the second motor can be started to drive the salvage net to rotate continuously, enabling the wavy permeate to push the solid particles floating on the surface into the semi-circular ring of the partition plate. As the salvage net rotates, when it contacts the semi-circular ring, the solid particles are scooped up. And because the salvage net is arc-shaped, it can effectively hold the solid particles during the rotation process and, when rotating to a specific position, dump the solid particles into the collection chamber by gravity, completing the centralized collection of pollutants. At the same time, the permeate intercepted by the salvage net during rotation will flow back into the aeration tank obliquely, realizing the recycling of water resources. Moreover, the rotational aeration of the stirring pipe and the blowing of the air knife cooperate to quickly disturb the water body, enabling microorganisms to fully contact pollutants, accelerating the decomposition of pollutants, and at the same time, efficiently promoting the concentration of solid particles, creating conditions for salvage, reducing the residence time of pollutants in the aeration tank, overall accelerating the wastewater treatment process, ensuring the efficient removal of solid particles in the aeration tank, reducing the risk of secondary pollution, and at the same time improving the purity of the effluent water quality and guaranteeing the stability of the treatment effect. Brief Description of the Drawings

[0023] Figure 1 is the overall structural schematic diagram of the present invention;

[0024] Figure 2 is the structural schematic diagram of the wastewater tank and the aeration tank of the present invention;

[0025] Figure 3 It is a schematic structural diagram of the overall top view of the present invention;

[0026] Figure 4 It is a schematic structural diagram of the U-shaped sealing hopper and the backing plate of the present invention;

[0027] Figure 5 It is a schematic structural diagram of the funnel tube of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the membrane separation mechanism of the present invention;

[0029] Figure 7 It is a schematic structural diagram of the aeration mixing mechanism of the present invention;

[0030] Figure 8 It is a schematic structural diagram of the fishing mechanism of the present invention;

[0031] Figure 9 It is a schematic structural diagram of the semi-circular ring and the fishing net of the present invention.

[0032] In the figure: 1. Wastewater tank; 101. Ball valve; 102. Aeration tank; 103. T-shaped connecting plate; 104. Collection chamber; 2. Aeration mixing mechanism; 201. Air pump; 202. Four-way pipe; 203. Air knife; 204. Hollow shaft reduction motor; 205. Stirring pipe; 206. Stirring blade; 207. Air pipe; 208. Liquid level sensor; 3. Fishing mechanism; 301. Docking plate; 302. Partition plate; 303. Fishing net; 304. Semi-circular ring; 305. Second motor; 4. Membrane separation mechanism; 401. Trapezoidal block; 402. First motor; 403. U-shaped sealing hopper; 404. Backing plate; 405. Solenoid valve; 406. Outlet pipe; 407. Funnel tube; 408. U-shaped drainage plate; 409. Sleeve ring; 410. Connecting ring; 411. Discharge port; 412. Ring groove. Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0034] Such as Figures 1 - 3As shown in the figure, an efficient and low-energy-consuming membrane bioreactor wastewater treatment device includes: a wastewater tank 1 and an aeration tank 102. A ball valve 101 is connected and installed at one end of the wastewater tank 1, and the ball valve 101 can be connected to an external wastewater pipe. A membrane separation mechanism 4 is rotatably installed in the wastewater tank 1. The drainage end of the membrane separation mechanism 4 penetrates from one end of the wastewater tank 1 into the aeration tank 102, so that after the membrane separation mechanism 4 separates the solid and liquid in the wastewater, the filtered water can become permeate and flow into the aeration tank 102 again through the drainage end for secondary treatment. During the process of the membrane separation mechanism 4 separating the solid and liquid in the wastewater, it will rotate simultaneously, so that the separation end not covered by solid particles can continuously separate the wastewater, thereby avoiding a large filtration resistance of the wastewater through the membrane, enabling solid-liquid separation to be achieved at a lower pressure, and thus reducing the energy consumption for promoting the water flow through the membrane;

[0035] Among them, a T-shaped connecting plate 103 is fixedly installed on the upper surface of the aeration tank 102, and an aeration mixing mechanism 2 is fixedly installed on the upper surface of the T-shaped connecting plate 103. The aeration mixing mechanism 2 can inject oxygen into the aeration tank 102 to cause strong disturbance and mixing between these tiny bubbles and the surrounding permeate during the rising process, and generate tiny bubbles through aeration. The hydrophobic adsorption effect between the bubbles and the solid particles is used to achieve flotation. As a result, the solid particles in the permeate can float to the surface of the permeate together with the bubbles. The solid particles floating on the surface of the permeate can be rotatably captured by the fishing mechanism 3 and dumped into the collection chamber 104. The collection chamber 104 is fixedly installed at one end of the wastewater tank 1.

[0036] Through the design of the wastewater tank 1, the aeration tank 102, the collection chamber 104, the aeration mixing mechanism 2, the salvage mechanism 3 and the membrane separation mechanism 4, during use, external wastewater can be introduced into the wastewater tank 1 through the ball valve 101. As the wastewater enters, the membrane separation mechanism 4 rotatably installed in the wastewater tank 1 starts to operate. And this membrane separation mechanism 4 uses a continuous rotation method to continuously update the membrane surface to participate in the separation of wastewater, avoiding the increase in filtration resistance caused by the accumulation of solid particles, enabling it to always achieve solid-liquid separation under low pressure, thereby reducing the energy consumed by the water pump to increase the water pressure. The filtered permeate will directly flow into the aeration tank 102, while the intercepted solid particles are discharged by rotation. The aeration tank 102 serves as the core area for secondary treatment. The T-shaped connecting plate 103 above it bears the aeration mixing mechanism 2, which converts air into tiny bubbles and injects them into the aeration tank 102. In this way, during the rising process of the bubbles, they not only provide oxygen for microorganisms but also carry solid particles to float upward through charge adsorption, and at the same time strongly disturb and mix the liquid to form directional ripples on the liquid surface, pushing the floating objects towards the collection chamber 104, reducing additional stirring equipment and energy consumption, and lowering the overall operating cost. Furthermore, the floating solid particles can be washed into the salvage mechanism 3 from the aeration tank 102 by the waves. The salvage mechanism 3 will accurately capture the solid particles floating on the liquid surface by rotation and rotate to pour the solid particles into the collection chamber 104 for centralized storage. And the captured solid particles will redirect the permeate among them into the aeration tank 102 during rotation, that is, the complete separation and collection of pollutants are completed.

[0037] As Figures 4 - 6 shown, the membrane separation mechanism 4 includes a trapezoidal block 401, which is fixedly installed in the wastewater tank 1. One end of the trapezoidal block 401 is recessed with an annular groove 412. The center of the annular groove 412 is provided with a U-shaped drainage plate 408 in a suspended manner. The U-shaped drainage plate 408 is fixedly installed at one end of the wastewater tank 1. Both ends of the outer surface of the U-shaped drainage plate 408 are rotatably installed with collar rings 409. And a support plate 404 is fixedly installed between the two collar rings 409. The support plate 404 is a ring formed by connecting multiple triangular frames, and a microporous membrane is attached to the outer surface of the support plate 404.

[0038] One end of a set of collar rings 409 is fixedly installed with a connecting ring 410. The connecting ring 410 is rotatably installed in the annular groove 412 and fixedly connected to the output shaft of the first motor 402. The first motor 402 is fixedly installed in the trapezoidal block 401. In this way, the lining plate 404 can drive the microporous membrane attached to its outer surface to be driven to rotate through the collar rings 409. The lower half of the outer surface of the lining plate 404 is sleeved with a U-shaped sealing hopper 403. The U-shaped sealing hopper 403 is fixedly installed in the wastewater tank 1. In this way, the lining plate 404 can drive the microporous membrane on its outer surface to abut against the inner annular surface of the U-shaped sealing hopper 403. In this way, only the upper half of the lining plate 404 can allow wastewater to flow into the U-shaped drainage plate 408 through the microporous membrane. The lower half of the lining plate 404 rotated into the U-shaped sealing hopper 403 can be sealed. The solid particles remaining after the wastewater passes through will stay in the triangular angle groove formed between the lining plates 404. When it is driven to rotate, the solid particles can be poured into the U-shaped sealing hopper 403. The solid particles fall into the funnel cylinder 407 through the discharge port 411 connected to the lower surface of the U-shaped sealing hopper 403. The discharge port 411 penetrates through the bottom of the wastewater tank 1. The funnel cylinder 407 is connected and installed at the lower surface of the wastewater tank 1. One end of the U-shaped drainage plate 408 is connected and installed with a solenoid valve 405. One end of the solenoid valve 405 is connected and installed with a water outlet pipe 406. The water outlet pipe 406 penetrates from one end of the wastewater tank 1 into the aeration tank 102.

[0039] Through the design of the first motor 402, U-shaped sealed hopper 403, lining plate 404, solenoid valve 405, funnel cylinder 407, U-shaped drainage plate 408 and collar 409, after introducing external wastewater into the wastewater tank 1 through the ball valve 101, the first motor 402 can be started to drive the lining plate 404 to rotate on the outer surface of the U-shaped drainage plate 408 through the collar 409. Furthermore, the lining plate 404 can drive the microporous membrane attached to its outer surface to rotate together. And because the lower half of the outer surface of the lining plate 404 is sleeved with a U-shaped sealed hopper 403, only the upper half of the microporous membrane can contact the wastewater. Thus, under the action of gravity or the slight pressure of wastewater injection, the wastewater can permeate through the microporous membrane for solid-liquid separation. The filtered permeate will flow into the U-shaped drainage plate 408 and, controlled by the solenoid valve 405, flow into the aeration tank 102 through the water outlet pipe 406. While the solid particles are intercepted in the triangular included angle groove formed between the lining plates 404. As the lining plate 404 continues to rotate, when the part with intercepted solid particles rotates into the U-shaped sealed hopper 403, the solid particles will fall due to gravity and can enter the funnel cylinder 407 through the discharge port 411 on the lower surface of the U-shaped sealed hopper 403 and finally be collected and discharged. And through the rotation of the microporous membrane driven by the lining plate 404, the membrane surface can be continuously updated to participate in the separation, avoiding the accumulation of solid particles on the membrane surface to form a filtration resistance. In this way, there is no need to increase the water pump pressure to promote wastewater filtration, reducing the energy consumption of power equipment, achieving efficient solid-liquid separation under low pressure, thereby reducing the overall operation cost. And the continuously rotating microporous membrane can continuously contact with fresh wastewater, ensuring the continuity and efficiency of the solid-liquid separation process. At the same time, the design of the U-shaped sealed hopper 403 accurately controls the contact area between the wastewater and the membrane, enabling the filtered permeate to quickly flow into the U-shaped drainage plate 408, reducing the residence time of the liquid in the wastewater tank 1 and accelerating the treatment speed.

[0040] As Figures 7 - 9 shown, the aeration mixing mechanism 2 includes an air pump 201. The air pump 201 is fixedly installed at one end of the upper surface of the T-shaped connecting plate 103. One end of the air outlet of the air pump 201 is connected and installed with a four-way pipe 202. Two groups of the four-way pipe 202 are rotatably connected and communicated with two groups of stirring pipes 205. And the stirring pipes 205 are inserted and installed in the output shaft of the hollow shaft reduction motor 204. The hollow shaft reduction motor 204 is fixedly installed at both ends of the upper surface of the T-shaped connecting plate 103. Stirring blades 206 are fixedly installed on the outer surface of the stirring pipes 205. Thus, when the stirring pipes 205 are driven to rotate by the hollow shaft reduction motor 204, air will be injected through the air pump 201 and discharged into the aeration tank 102 through the air pipe 207. The air pipe 207 is connected and installed at the outer surface of the stirring pipes 205.

[0041] Among them, another set of pipes of the four-way pipe 202 is communicated with the air knife 203. The air knife 203 is fixedly installed at both ends of the outer surface of the T-shaped connecting plate 103, and the air outlet is inclined downward at an angle of 40°. In this way, the air knife 203 can generate ripples on the surface of the permeate by blowing and make it flow in the direction of the collection chamber 104. One end of the T-shaped connecting plate 103 is fixedly installed with a liquid level sensor 208. The signal transmitting end of the liquid level sensor 208 is connected to the signal receiving end of the controller, and the control output end of the controller is electrically connected to the electric control ends of the first motor 402 and the solenoid valve 405, so that the liquid level sensor 208 can detect and maintain the water level at the same height as the salvage mechanism 3;

[0042] Among them, the models of the liquid level sensor 208 and the controller are UR60 and CP1H respectively.

[0043] The salvage mechanism 3 includes a partition plate 302 and a docking plate 301. The partition plate 302 is fixedly installed at one end inside the aeration tank 102. The upper end of the partition plate 302 is fixedly installed with a semi-circular ring 304. The docking plates 301 are fixed on both sides inside the aeration tank 102, and a salvage net 303 is rotatably installed between the two docking plates 301. The salvage net 303 can rotate and touch the inner ring wall of the semi-circular ring 304 of the partition plate 302, and then can push the solid particles floating on the surface of the permeate in a wavy shape into the semi-circular ring 304 to be picked up by the rotating salvage net 303. The salvage net 303 is in an arc shape, and the salvage net 303 is fixedly connected to the output shaft of the second motor 305. The second motor 305 is fixedly installed at one end of one of the docking plates 301.

[0044] Through the design of the air pump 201, four-way pipe 202, air knife 203, hollow shaft reduction motor 204, stirring pipe 205, liquid level sensor 208, second motor 305, salvage net 303 and semi-circular ring 304, after the permeate flows into the aeration tank 102, the air pump 201 can be started to pressurize and transport air to the four-way pipe 202 for shunting. A part of the air enters the stirring pipe 205 connected to the output shaft of the hollow shaft reduction motor 204 through the four-way pipe 202. While the stirring pipe 205 rotates driven by the hollow shaft reduction motor 204, the liquid in the aeration tank 102 is agitated by the stirring blades 206 outside the pipe. At the same time, the air in the pipe is discharged in the form of tiny bubbles through the air pipe 207 installed through the outer surface. During the rising process of these bubbles, on the one hand, they provide the oxygen required for microorganisms to decompose pollutants, and on the other hand, they adsorb solid particles in the permeate by surface charge, making them float to the liquid surface with the bubbles. Another part of the air flows into the air knife 203 through the four-way pipe 202, and the air knife 203 blows air continuously at a downward inclination of 40° to the permeate surface, so as to generate directional ripples on the liquid surface and push the solid particles floating on the liquid surface towards the collection chamber 104, creating favorable conditions for the work of salvaging solid particles. During the process of the permeate flowing into the aeration tank 102, the liquid level sensor 208 therein will monitor the liquid level height in the aeration tank 102 in real time and transmit the data signal to the controller. The controller analyzes and processes the signal according to the preset program. When the liquid level is lower than the set value, the controller sends instructions to the first motor 402 and the solenoid valve 405 to increase the rotation speed of the backing plate 404 or increase the discharge flow rate of the permeate to supplement the liquid in the aeration tank 102. When the liquid level is higher than the set value, the rotation of the backing plate 404 is slowed down or the discharge of the permeate is reduced to ensure that the water level is always flush with the working height of the semi-circular ring 304, ensuring the salvage effect. Subsequently, the second motor 305 can be started to drive the salvage net 303 to rotate continuously, so that the wavy permeate pushes the solid particles floating on the surface into the semi-circular ring 304 of the partition plate 302. As the salvage net 303 rotates, when it contacts the semi-circular ring 304, the solid particles are fished up. And because the salvage net 303 is in an arc shape, it can effectively hold the solid particles during the rotation process, and when it rotates to a specific position, the solid particles are dumped into the collection chamber 104 by gravity, completing the centralized collection of pollutants. At the same time, the permeate intercepted by the salvage net 303 during the rotation process will flow back into the aeration tank 102 through the inclination, realizing the recycling of water resources. Moreover, the rotational aeration of the stirring pipe 205 and the blowing of the air knife 203 cooperate to quickly disturb the water body, enabling microorganisms to fully contact pollutants, accelerating the decomposition of pollutants, and at the same time, it can efficiently push the solid particles to concentrate, creating conditions for salvage, reducing the residence time of pollutants in the aeration tank 102, overall accelerating the wastewater treatment process, ensuring the efficient removal of solid particles in the aeration tank 102, reducing the risk of secondary pollution, and at the same time improving the purity of the effluent quality and ensuring the stability of the treatment effect.

[0045] The high-efficiency and low-energy consumption control method for the high-efficiency and low-energy consumption membrane bioreactor wastewater treatment device includes the following steps:

[0046] The rotational angular velocity ω of the membrane separation mechanism 4 is adjusted in real time through the dynamic membrane resistance-rotation cooperative equation, and the equation is:

[0047]

[0048] Where:

[0049] R(ω) is the dynamic membrane resistance (Pa·s / m);

[0050] R0 is the initial clean membrane resistance (Pa·s / m);

[0051] R max is the limit resistance at complete blockage (Pa·s / m);

[0052] ω is the membrane rotational angular velocity (rad / s);

[0053] τ is the characteristic time constant (s);

[0054] k is the rotation efficiency coefficient related to the geometric structure of the membrane surface;

[0055] The controller inversely calculates the optimal rotational angular velocity according to the target treatment flux J and the real-time detected liquid level data:

[0056]

[0057] And dynamically adjusts the rotational speed of the first motor 402 to keep the actual membrane resistance R(ω) within the range of R0 to 0.6R max interval.

[0058] When the liquid level sensor 208 detects that the liquid level fluctuation amplitude of the aeration tank 102 exceeds the set threshold, the controller synchronously increases the aeration volume Q of the air pump 201 and the rotational angular velocity ω, and satisfies the constraint condition:

[0059] Q = αω + β (α = 0.15

[0060] To achieve the synergistic enhancement of bubble perturbation and membrane surface renewal.

[0061] The value of the rotation efficiency coefficient k is dynamically calibrated through the following formula:

[0062]

[0063] Where:

[0064] N is the number of triangular frames of the backing plate 404

[0065] D is the diameter of the membrane module (m)

[0066] θ max ,θ min is the maximum and minimum angle between adjacent triangle frames (rad).

[0067] When R(ω)>0.8R is detected max When it lasts for more than 3τ, the controller triggers the reverse pulse rotation mode, so that the liner plate 404 runs at -ω for 0.2τ and then resumes forward rotation, thereby achieving self-cleaning of the membrane surface.

[0068] The controller has the above dynamic membrane resistance-rotation synergy equation built in, which can dynamically adjust the speed of the first motor 402 and the opening of the solenoid valve 405 according to the real-time liquid level change and the membrane resistance calculation result, so that the water level is maintained at the same height as the salvage mechanism 3, and at the same time ensure that R(ω)≤0.6R max .

[0069] Exemplary implementation scenario:

[0070] When treating high-concentration wastewater, the liquid level sensor detects that the liquid level in the aeration tank has dropped. The controller calculates that ω needs to be increased from 0.5rad / s to 0.8rad / s according to the equation. At the same time, the above constraints increase the air pump aeration volume from 0.275m 3 / s increased to 0.32m 3 / s, achieving the coordinated optimization of membrane flux enhancement and bubble flotation, ensuring the stable operation of the system under ΔP≤0.15bar.

[0071] Technical effects:

[0072] Dynamic regulation of resistance: Rotation increases the denominator ωτ, significantly reducing the actual operating resistance R(ω), which is 40%-60% less than traditional static membranes.

[0073] Energy consumption optimization: Under the same flux, the required transmembrane pressure difference ΔP is reduced to 1 / 3-1 / 2 of conventional MBR, and the water pump energy consumption is reduced by more than 50%.

[0074] Self-cleaning effect: When ω>1 / kτ, the resistance approaches R0, achieving near-zero pollution accumulation.

[0075] Working principle process:

[0076] 1. Membrane surface renewal mechanism: Rotation drives the microporous membrane to periodically leave the solid-liquid contact area, and the mechanical shear force destroys the formation of the filter cake layer.

[0077] 2. Establishment of dynamic equilibrium: The equation quantifies the game relationship between the rotation speed ω and the pollutant attachment rate 1 / τ. When kωτ>>1, the system enters a low-resistance steady state.

[0078] 3. Cooperative parameter matching: By adjusting ω to keep R(ω) always in the efficient range and combining with the charge adsorption effect of aeration bubbles, dual-channel removal of solid-phase substances (membrane interception + air flotation) is achieved.

[0079] Summarize and sort out the working steps of this solution according to the above technical solution: When in use, external wastewater can be introduced into the wastewater tank 1 through the ball valve 101. Subsequently, the first motor 402 can be started to drive the supporting plate 404 to rotate on the outer surface of the U-shaped drainage plate 408 through the collar 409. Thus, the supporting plate 404 can drive the microporous membrane attached to its outer surface to rotate together. And because the lower half of the outer surface of the supporting plate 404 is sleeved with a U-shaped sealing hopper 403, only the upper half of the microporous membrane can contact the wastewater. Then, under the action of gravity or the slight pressure of wastewater injection, the wastewater can permeate through the microporous membrane for solid-liquid separation. The filtered permeate will flow into the U-shaped drainage plate 408 and is controlled by the solenoid valve 405 and flows into the aeration tank 102 through the water outlet pipe 406. The solid particles are intercepted in the triangular angle grooves formed between the supporting plates 404. With the continuous rotation of the supporting plate 404, when the part with intercepted solid particles rotates into the U-shaped sealing hopper 403, the solid particles fall due to gravity and can enter the funnel cylinder 407 through the discharge port 411 on the lower surface of the U-shaped sealing hopper 403 and are finally collected and discharged. During the process when the permeate flows into the aeration tank 102, the liquid level sensor 208 therein will monitor the liquid level height in the aeration tank 102 in real time and transmit the data signal to the controller. The controller analyzes and processes the signal according to the preset program. When the liquid level is lower than the set value, the controller sends instructions to the first motor 402 and the solenoid valve 405 to increase the rotation speed of the supporting plate 404 or increase the discharge flow rate of the permeate to supplement the liquid in the aeration tank 102. When the liquid level is higher than the set value, the rotation of the supporting plate 404 is slowed down or the discharge of the permeate is reduced to ensure that the water level is always flush with the working height of the semi-circular ring 304. After the permeate flows into the aeration tank 102, the air pump 201 can be started to pressurize and transport air to the four-way pipe 202 for shunting. Part of the air enters the stirring pipe 205 connected to the output shaft of the hollow shaft reduction motor 204 through the four-way pipe 202. While the hollow shaft reduction motor 204 drives the stirring pipe 205 to rotate, the liquid in the aeration tank 102 is stirred by the stirring blades 206 outside the pipe. At the same time, the air in the pipe is discharged in the form of tiny bubbles through the trachea 207 connected to the outer surface. During the rising process of these bubbles, on the one hand, they provide the oxygen required for microorganisms to decompose pollutants, and on the other hand, they adsorb the solid particles in the permeate by surface charge and make them float to the liquid surface with the bubbles. Another part of the air flows into the air knife 203 through the four-way pipe 202. The air knife 203 is inclined downward at 40° and continuously blows air to the surface of the permeate, so as to generate directional ripples on the liquid surface and push the solid particles floating on the liquid surface towards the collection chamber 104, creating favorable conditions for the work of salvaging the solid particles. Subsequently, the second motor 305 can be started to drive the fishing net 303 to rotate continuously, so that the wavy permeate pushes the solid particles floating on the surface into the semi-circular ring 304 of the partition plate 302. With the rotation of the fishing net 303, when it contacts the semi-circular ring 304,The solid particles are fished out. Since the fishing net 303 is arc-shaped, it can effectively hold the solid particles during the rotation process. When rotating to a specific position, the solid particles are poured into the collection chamber 104 by gravity to complete the centralized collection of pollutants. At the same time, the permeate intercepted by the fishing net 303 during the rotation process will flow back into the aeration tank 102 through inclination to realize the recycling of water resources.

[0080] In summary, for this high-efficiency and low-energy-consuming membrane bioreactor wastewater treatment device, by driving the rotation of the microporous membrane through the supporting plate 404, the membrane surface can be continuously updated to participate in separation, avoiding the formation of filtration resistance due to the accumulation of solid particles on the membrane surface. In this way, there is no need to increase the water pump pressure to promote wastewater filtration, reducing the energy consumption of power equipment and achieving efficient solid-liquid separation under low pressure, thereby reducing the overall operating cost.

[0081] Parts not involved in the present invention are the same as or can be implemented using existing technologies. Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An efficient and low - energy - consuming membrane bioreactor wastewater treatment device, characterized in that, include: A wastewater tank (1) and an aeration tank (102), wherein one end of the wastewater tank (1) is connected to a ball valve (101), and the ball valve (101) can be connected to an external wastewater pipe. A membrane separation mechanism (4) is rotatably installed in the wastewater tank (1), and a drainage end of the membrane separation mechanism (4) extends from one end of the wastewater tank (1) into the aeration tank (102), so that the membrane separation mechanism (4) can separate solid and liquid in the wastewater, and then allow the filtered water to become a permeate and flow through the drainage end into the aeration tank (102) again for secondary treatment. The separation end of the membrane separation mechanism (4) will rotate together during the solid-liquid separation of the wastewater, so that the separation end that is not covered by solid particles can continuously separate the wastewater, thereby avoiding a large filtration resistance of the wastewater passing through the membrane, and can achieve solid-liquid separation at a lower pressure, thereby reducing the energy consumption for driving the water flow through the membrane.

2. The wastewater treatment device of a high-efficiency and low-energy-consuming membrane bioreactor according to claim 1, characterized in that: A T-shaped connecting plate (103) is fixedly mounted on the upper surface of the aeration tank (102), and an aeration mixing mechanism (2) is fixedly mounted on the upper surface of the T-shaped connecting plate (103). The aeration mixing mechanism (2) can inject oxygen into the aeration tank (102) so that the tiny bubbles can generate strong disturbance and mixing effects with the surrounding permeate during the rising process, and can generate tiny bubbles through aeration, and can achieve flotation by utilizing the hydrophobic adsorption effect between the bubbles and the solid particles, thereby allowing the solid particles in the permeate to float to the surface of the permeate together with the bubbles, and the solid particles floating to the surface of the permeate can be captured by the salvage mechanism (3) in a rotational manner and dumped into a collection chamber (104). The collection chamber (104) is fixedly mounted at one end of the wastewater tank (1); The membrane separation mechanism (4) comprises a trapezoidal block (401), the trapezoidal block (401) being fixedly mounted in a wastewater tank (1), one end of the trapezoidal block (401) being provided with an annular groove (412) in an embedded manner, a U-shaped drainage plate (408) being suspended in the center of the annular groove (412), the U-shaped drainage plate (408) being fixedly mounted on one end of the wastewater tank (1), both ends of the outer surface of the U-shaped drainage plate (408) being rotatably mounted with collars (409), a backing plate (404) being fixedly mounted between two groups of the collars (409), the backing plate (404) being formed into a ring shape by connecting a plurality of groups of triangular frames, and a microporous membrane being attached to the outer surface of the backing plate (404).

3. An efficient and low-energy-consuming membrane bioreactor wastewater treatment device according to claim 2, characterized in that: One end of one group of the sleeve rings (409) is fixedly mounted with a connecting ring (410), and the connecting ring (410) is rotatably mounted in a ring groove (412) and fixedly connected to the output shaft of a first motor (402), and the first motor (402) is fixedly mounted in a trapezoidal block (401), so that the lining plate (404) can drive the microporous membrane attached to the outer surface to rotate through the sleeve ring (409).

4. An efficient and low-energy consumption membrane bioreactor wastewater treatment device according to claim 3, characterized in that: The lower half of the outer surface of the backing plate (404) is sleeved with a U-shaped sealing hopper (403). The U-shaped sealing hopper (403) is fixedly installed in the wastewater tank (1), so that the backing plate (404) can drive the microporous membrane on its outer surface to contact the inner ring surface of the U-shaped sealing hopper (403), thereby enabling only the upper half of the backing plate (404) to allow wastewater to flow into the U-shaped drainage plate (408) through the microporous membrane. The lower half of the backing plate (404) rotated into the U-shaped sealing hopper (403) can be sealed, and the solid particles remaining after the wastewater passes through will stay in the triangular clamping groove formed between the backing plates (404), so that as it is driven to rotate, the solid particles can be poured into the U-shaped sealing hopper (403), and the solid particles fall into the funnel cylinder (407) through the discharge port (411) connected and installed on the lower surface of the U-shaped sealing hopper (403). The discharge port (411) penetrates through the bottom of the wastewater tank (1), and the funnel cylinder (407) is connected and installed on the lower surface of the wastewater tank (1).

5. An efficient and low - energy - consuming membrane bioreactor wastewater treatment device according to claim 4, characterized in that: One end of the U-shaped drainage plate (408) is connected and installed with a solenoid valve (405). One end of the solenoid valve (405) is connected and installed with a water outlet pipe (406). The water outlet pipe (406) penetrates from one end of the wastewater tank (1) into the aeration tank (102).

6. An efficient and low - energy - consuming membrane bioreactor wastewater treatment device according to claim 5, characterized in that: The aeration and mixing mechanism (2) includes an air pump (201). The air pump (201) is fixedly installed at one end of the upper surface of the T-shaped connecting plate (103). The air outlet end of the air pump (201) is connected and installed with a four-way pipe (202). Two of the four-way pipes (202) are rotatably connected and communicated with two stirring pipes (205). The stirring pipes (205) are inserted into the output shaft of the hollow shaft reduction motor (204). The hollow shaft reduction motor (204) is fixedly installed at both ends of the upper surface of the T-shaped connecting plate (103). The outer surface of the stirring pipe (205) is fixedly installed with stirring blades (206). Thus, when the stirring pipe (205) is driven to rotate by the hollow shaft reduction motor (204), air will be injected through the air pump (201) and discharged into the aeration tank (102) through the air pipe (207). The air pipe (207) is connected and installed on the outer surface of the stirring pipe (205).

7. An efficient and low-energy-consuming membrane bioreactor wastewater treatment device according to claim 6, characterized in that: The other set of pipes of the four-way pipe (202) is communicated with an air knife (203). The air knife (203) is fixedly installed at both ends of the outer surface of the T-shaped connecting plate (103), and the air outlet is inclined downward at an angle of 40°. Thus, the air knife (203) can blow the surface of the permeate to generate ripples and make it flow towards the collection chamber (104).

8. An efficient and low-energy-consuming membrane bioreactor wastewater treatment device according to claim 7, characterized in that: One end of the T-shaped connecting plate (103) is fixedly installed with a liquid level sensor (208). The signal transmitting end of the liquid level sensor (208) is connected to the signal receiving end of the controller. The control output end of the controller is electrically connected to the electric control ends of the first motor (402) and the solenoid valve (405), so that the liquid level sensor (208) can detect and maintain the water level at a position flush with the height of the fishing mechanism (3).

9. An efficient and low-energy-consuming membrane bioreactor wastewater treatment device according to claim 8, characterized in that: The fishing mechanism (3) includes a partition plate (302) and a docking plate (301). The partition plate (302) is fixedly installed at one end inside the aeration tank (102). The upper end of the partition plate (302) is fixedly installed with a semi-circular ring (304). The docking plate (301) is fixed on both sides inside the aeration tank (102). A fishing net (303) is rotatably installed between the two groups of docking plates (301). The fishing net (303) can rotate and abut against the inner ring wall of the semi-circular ring (304) of the partition plate (302), so that the solid particles floating on the surface of the permeate in a wavy shape can be pushed into the semi-circular ring (304) and picked up by the rotating fishing net (303).

10. An efficient and low-energy-consuming membrane bioreactor wastewater treatment device according to claim 9, characterized in that: The fishing net (303) is in an arc shape. The fishing net (303) is fixedly connected to the output shaft of the second motor (305). The second motor (305) is fixedly installed at one end of one of the docking plates (301).

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