Integrated domestic sewage treatment equipment coupling AOA and MBBR process

Abstract

This invention discloses an integrated domestic wastewater treatment device coupling AOA and MBBR processes, belonging to the field of domestic wastewater treatment technology. It includes an anaerobic tank, an aerobic tank, an anoxic tank, a sedimentation tank, a reciprocating lifting mechanism, and a gathering and pushing mechanism. The reciprocating lifting mechanism includes a screen plate, which is used to longitudinally reciprocate and push packing material within the aerobic tank. The gathering and pushing mechanism includes multiple movable push plates circumferentially distributed at equal intervals on the inner sidewall of the top of the aerobic tank. This invention utilizes the reciprocating lifting motion of the screen plate within the aerobic tank to cause the settled packing material to rise and flow. After the screen plate rises to the corresponding height, the deflection and pushing mechanism on the screen plate causes the movable push plates circumferentially distributed on the inner sidewall of the top of the aerobic tank to simultaneously deflect and converge towards the center, thereby pushing the packing material near the dead zones at the tank wall corners to flow towards the center, thus ensuring full fluidization of the packing material throughout the aerobic tank.

Description

Technical Field

[0001] This invention relates to the field of domestic sewage treatment technology, and in particular to an integrated domestic sewage treatment device that couples AOA and MBBR processes. Background Technology

[0002] AOA process is a biological treatment process that utilizes anaerobic, aerobic, and anoxic environments to create the most suitable living environment for different types of microorganisms, thus treating them separately to achieve nitrogen and phosphorus removal from domestic sewage; MBBR is a moving bed biofilm reactor that adds a certain amount of suspended packing material to the reaction tank, allowing microorganisms to grow on the packing material to form a biofilm, thereby increasing the total biomass and biological species in the reaction tank.

[0003] Since the MBBR process can significantly increase the biomass within the reactor through a biofilm carrier, especially enriching nitrifying bacteria with lower growth rates, it can theoretically compensate for the insufficient nitrification capacity in the aerobic zone of the AOA process. Therefore, adding MBBR packing material to the aerobic zone of the AOA process to form an AOA-MBBR coupled process has become an important technical direction for enhancing nitrogen removal from wastewater with low carbon-to-nitrogen ratios.

[0004] When existing MBBR packing is added to the aerobic zone of the AOA process, it needs to rely on the aeration devices distributed at the bottom of the aerobic zone to continuously generate bubbles, providing sufficient dissolved oxygen for the nitrification reaction in the aerobic zone. The rising bubbles generated by aeration also exert drag and impact forces on the packing, causing the packing to tumble and fluidize violently in the water. In the fluidized state, the biofilm on the surface of the packing is in full contact with pollutants and dissolved oxygen in the wastewater, resulting in the highest mass transfer efficiency and effective functioning.

[0005] However, current aeration at the bottom of the aerobic zone mainly relies on strong aeration in the center. This is because aeration of the entire bottom causes the packing material to collide randomly in a small local area, losing its large-scale circulation path. In contrast, the rising bubbles generated by central aeration always rise along the path of least resistance. Due to the low shear force of the water near the pool wall, the bubbles tend to move towards the pool wall, which easily pushes the packing material to accumulate and become stuck, forming a dead zone. At the same time, since the density of new packing material is close to that of water, once the biofilm on the packing material thickens or scale forms, the overall density of the packing material exceeds that of water, making it prone to settling and creating a dead zone. The packing material in the dead zone cannot effectively fluidize and move, and dissolved oxygen and other substances cannot be effectively transferred to the biofilm inside the packing material. It is in a low dissolved oxygen or hypoxic environment for a long time, causing the biofilm to turn black and smelly, eventually leading to its failure. Summary of the Invention

[0006] The purpose of this invention is to provide an integrated domestic wastewater treatment device that couples AOA and MBBR processes, in order to solve the technical problem that dead zones are easily generated when packing is added to the aerobic zone of the integrated domestic wastewater treatment device that combines AOA and MBBR processes in the prior art, leading to the failure of the packing.

[0007] The technical problem to be solved by this invention can be achieved through the following technical solution:

[0008] An integrated domestic wastewater treatment device coupling AOA and MBBR processes includes an anaerobic tank, an aerobic tank, an anoxic tank, and a sedimentation tank, wherein the anaerobic tank, aerobic tank, anoxic tank, and sedimentation tank are connected in sequence, and further includes:

[0009] A reciprocating lifting mechanism, the reciprocating lifting mechanism including a sieve plate, the sieve plate being used to push packing material through longitudinal reciprocating motion in the aerobic tank;

[0010] The gathering and pushing mechanism includes multiple movable push plates circumferentially distributed at equal intervals on the inner side wall of the top of the aerobic tank. The reciprocating lifting mechanism also includes multiple sets of deflecting pushing mechanisms circumferentially distributed at equal intervals on the edge of the sieve plate. The deflecting pushing mechanisms are distributed correspondingly to the movable push plates. Each set of deflecting pushing mechanisms rises and falls synchronously with the sieve plate. When the sieve plate rises to the position of the movable push plate, each set of deflecting pushing mechanisms causes the corresponding movable push plate to deflect and push the packing material towards the center of the aerobic tank.

[0011] Preferably, the gathering and pushing mechanism further includes a mounting ring and a limiting ring for limiting the height of the screen plate. The mounting ring is fixedly connected to the top of the aerobic tank. The movable push plates, which are equidistantly distributed circumferentially on the inner side of the top of the aerobic tank, are vertically connected to the bottom of the mounting ring, and there is a gap between the movable push plates and the inner wall of the aerobic tank. The limiting ring is fixedly connected to the inner wall of the aerobic tank near the top.

[0012] Preferably, each set of deflection and pushing mechanisms includes a shaft frame, a strip-shaped rotating push plate, and a lifting hook plate. The shaft frame is fixedly connected to the sieve plate. One end of the strip-shaped rotating push plate near the center of the sieve plate is tilted upwards. The lifting hook plate is fitted below the other end of the strip-shaped rotating push plate. An elastic connecting rope is also connected between the lifting hook plate and the corresponding strip-shaped rotating push plate. An electric telescopic rod is fixedly installed on the outer side of the top of the aerobic tank. An elastic separation mechanism is connected between the telescopic end of the electric telescopic rod and the sieve plate. The lifting hook plate and the telescopic end of the electric telescopic rod rise and fall synchronously.

[0013] Preferably, the elastic separation mechanism includes a connecting ring and a connecting spring. The connecting ring is fitted to the upper edge of the sieve plate and is also connected to the sieve plate via the connecting spring. The connecting ring is fixedly connected to the telescopic end of the electric telescopic rod. The lifting hook plate is fixedly connected to the inner side wall of the connecting ring. Limiting guide rods that align with and cooperate with the limiting ring are vertically fixedly connected to both sides of the edge of the sieve plate, and the limiting guide rods pass through the connecting ring.

[0014] Preferably, the limiting guide rod includes a main body rod and a stop head. The main body rod is connected to the sieve plate, and the diameter of the stop head is larger than the diameter of the main body rod, and it is fixedly installed on the top of the main body rod.

[0015] Preferably, each of the movable push plates is an elastic metal plate, and the top of the movable push plate is rigidly connected to the mounting and fixing ring. When the lifting hook plate pushes the strip rotating push plate to a horizontal position, the strip rotating push plate separates from the corresponding deflected movable push plate, and the movable push plate rebounds and generates oscillation.

[0016] Preferably, an elastic diaphragm is connected between the bottom of each movable push plate and the inner wall of the aerobic tank, and the elastic diaphragm has a strip-shaped opening for the corresponding strip-shaped rotating push plate to pass through.

[0017] Preferably, each of the movable push plates is provided with a turning mechanism for turning the packing.

[0018] Preferably, the actuating mechanism includes an actuating plate, a traction wire, and an elastic reset member; the actuating plate is rotatably connected to the side of the movable push plate near the middle of the aerobic tank via a hinge; one end of the traction wire is connected to the actuating plate, and the other end is connected to a limiting ring; the elastic reset member is connected between the movable push plate and the actuating plate.

[0019] Preferably, the elastic reset member is an elastic rubber diaphragm, and is obliquely connected at the included angle between the toggle plate and the movable push plate.

[0020] The beneficial effects of this invention are:

[0021] 1. This invention utilizes the reciprocating motion of a screen plate within the aerobic tank to cause the settled packing material to rise and flow. After the screen plate reaches the corresponding height, a deflection and pushing mechanism on the screen plate causes the movable push plates distributed circumferentially on the inner wall of the top of the aerobic tank to simultaneously deflect and converge towards the center. This pushes the packing material near the dead zones at the corners of the tank wall to flow towards the center, thus ensuring that the packing material in the entire aerobic tank is fully fluidized and moving. This prevents the biofilm in the dead zones from aging, turning black, and failing due to lack of oxygen, which would affect the wastewater treatment effect.

[0022] 2. When the sieve plate of the present invention rises to the corresponding height position, it stops due to the cooperation of the limiting guide rod and the limiting ring. At this time, the electric telescopic rod continues to drive the connecting ring on the sieve plate to continue to rise. The connecting ring drives the distributed lifting hook plates to rise. The lifting hook plates squeeze the lower end of the corresponding strip rotating push plate, thereby causing the higher end of the strip rotating push plate to deflect and squeeze the corresponding movable push plate, causing it to deflect and push the filler near the edge, realizing the automatic deflection of the movable push plate, which is convenient to operate.

[0023] 3. The movable push plate of the present invention is an elastic metal plate. After the strip rotating push plate squeezes and pushes the movable push plate to the corresponding angle position, the strip rotating push plate separates from the movable push plate. The movable push plate then rebounds and vibrates instantly. The vibration energy generated by the vibration can be transferred to the packing material through the water medium, which helps the poorly adhered and brittle outer aged biofilm on the packing material to fall off, so that the packing material can continue to function.

[0024] 4. The movable push plate of this invention vibrates in the water, and at the same time, the reciprocating motion of the screen plate causes violent disturbance to the water, which is conducive to the continuous peeling and renewal of the liquid film on the surface of the packing material. Fresh water and oxygen can quickly reach the surface of the biofilm, and the mass transfer efficiency is improved.

[0025] 5. When the movable push plate of the present invention deflects and converges towards the middle position of the aerobic tank, the agitator plates distributed on each movable push plate are tangentially deflected and push the packing material due to the reverse traction of the traction steel wire, which further enhances the fluidization of the packing material, increases the diversity of packing material movement, and further promotes the transfer of dissolved oxygen and other substances to the internal biofilm. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 This is a schematic diagram of the structure in which the reciprocating lifting mechanism, the gathering and pushing mechanism, and the aerobic tank are configured in conjunction in this invention;

[0028] Figure 3 This is a schematic diagram of the gathering and pushing mechanism in this invention;

[0029] Figure 4 This is a top view schematic diagram of the connection between the movable push plate and the actuating plate in this invention;

[0030] Figure 5 yes Figure 4 A magnified schematic diagram of the local structure at point A;

[0031] Figure 6 This is a schematic diagram of the reciprocating lifting mechanism in this invention;

[0032] Figure 7 yes Figure 6 A magnified schematic diagram of the local structure at point B;

[0033] Figure 8 This is a schematic diagram showing the state of the sieve plate rising to the position of the movable push plate in this invention;

[0034] Figure 9 yes Figure 8 A magnified schematic diagram of the structure at point C in the middle;

[0035] Figure 10 This is a schematic diagram of the state in which the strip-shaped rotating pusher plate squeezes the movable pusher plate when the connecting ring rises relative to the sieve plate in this invention;

[0036] Figure 11 This is a bottom view of the structure of the movable push plate connected to the inner wall of the aerobic tank via an elastic diaphragm in this invention.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Aerobic tank; 2. Anoxic tank; 3. Anaerobic tank; 4. Sedimentation tank; 5. Reciprocating lifting mechanism; 51. Connecting ring; 52. Limiting guide rod; 53. Screen plate; 54. Deflecting and pushing mechanism; 541. Shaft frame; 542. Strip rotating push plate; 543. Lifting hook plate; 544. Elastic connecting rope; 55. Connecting spring; 57. Elastic diaphragm; 571. Strip opening; 6. Gathering and pushing mechanism; 61. Movable push plate; 62. Mounting and fixing ring; 63. Limiting ring; 64. Actuating plate; 65. Elastic reset component; 66. Traction steel wire; 7. Electric telescopic rod. Detailed Implementation

[0039] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0040] like Figures 1-11As shown, an integrated domestic wastewater treatment device coupling AOA and MBBR processes is presented. AOA is a biological treatment process utilizing anaerobic, aerobic, and anoxic environments to create optimal living conditions for different types of microorganisms, treating them separately to achieve nitrogen and phosphorus removal from wastewater. MBBR is a moving bed biofilm reactor. By adding a certain amount of suspended packing material to the reaction tank, microorganisms grow on the packing material to form a biofilm, thereby increasing the total biomass and biodiversity in the reaction tank. The packing material is generally a circular plastic product with a density close to water and a complex internal mesh structure. Microorganisms attach to the inner and outer surfaces of the packing material and grow to form a biofilm. The coupling of AOA and MBBR processes involves adding MBBR packing material to the aerobic zone of the AOA process, which can immobilize a large number of nitrifying bacteria, ensuring efficient nitrification even at low water temperatures or short sludge ages, thus solving the problem of... The conflict between nitrogen and phosphorus removal in activated sludge processes regarding sludge age is addressed in this integrated domestic wastewater treatment system. The system comprises an anaerobic tank 3, an aerobic tank 1, an anoxic tank 2, and a sedimentation tank 4, connected sequentially. Domestic wastewater enters the anaerobic tank 3 via a bottom-in, top-out flow. Polyphosphate-accumulating bacteria and polysaccharide-accumulating bacteria in the anaerobic tank 3 absorb volatile fatty acids from the wastewater, synthesizing them into polyhydroxyalkanoates which are stored intracellularly, preparing for subsequent deep nitrogen removal in the anoxic zone. Simultaneously, polyphosphate-accumulating bacteria decompose polyphosphates within their cells, releasing phosphates into the water and simultaneously obtaining energy for organic matter absorption. Water from anaerobic tank 3 then enters aerobic tank 1 from the bottom and exits from the top side. In aerobic tank 1, nitrifying bacteria biofilms growing on the packing material convert ammonia nitrogen into nitrate nitrogen. An aeration device is installed at the bottom of aerobic tank 1, continuously aerating the tank to provide dissolved oxygen for the microorganisms and also promoting fluidization of the packing material. Polyphosphate-accumulating bacteria utilize the internal carbon source stored in the anaerobic zone as an energy source, excessively absorbing phosphates from the water and synthesizing polyphosphates for storage. Water from aerobic tank 1 then enters anoxic tank 2 from the top side. In anoxic tank 2, denitrifying bacteria utilize the carbon source stored in the anaerobic zone... The internal carbon source reduces the nitrate nitrogen produced in the aerobic zone to nitrogen gas, achieving deep denitrification. Wastewater is discharged from the bottom of the anoxic tank 2 and enters the sedimentation tank 4, where sludge and water are separated by sedimentation. It should be noted that a transfer pump can be installed at the corresponding pipe connection point to transport wastewater, ensuring that water can flow from a lower level to a higher level. At the same time, a sludge return pipe is connected between the bottom of the sedimentation tank 4 and the inlet pipe of the anaerobic tank 3, continuously sending the activated sludge concentrated at the bottom of the sedimentation tank 4 back to the front end of the anaerobic tank 3, so that the anaerobic tank 3 always maintains a high concentration of functional bacteria, ensuring efficient absorption of organic matter and sufficient synthesis of PHA.

[0041] It should be noted that anaerobic tank 3, aerobic tank 1, and anoxic tank 2 are all cylindrical.

[0042] To further enhance the fluidization effect of the packing material in the aerobic tank 1 and eliminate dead zones at the bottom and corners, the treatment equipment also includes a reciprocating lifting mechanism 5 and a gathering and pushing mechanism 6. The reciprocating lifting mechanism 5 includes a sieve plate 53, which moves longitudinally back and forth in the aerobic tank 1 to continuously push the settled packing material upwards, eliminate sedimentation at the bottom of the packing material, and ensure that all the packing material flows effectively in the tank, preventing the accumulated packing material biofilm from aging, blackening, and failing due to lack of oxygen. At the same time, the up-and-down movement of the sieve plate 53 can generate strong disturbance and shearing of the surrounding liquid, causing the liquid film on the surface of the packing material to be continuously peeled off and renewed, allowing fresh water and oxygen to quickly reach the surface of the biofilm. It should be noted that the sieve holes distributed on the sieve plate 53 are smaller than the packing material, which ensures that the packing material is always above the sieve plate 53.

[0043] The gathering and pushing mechanism 6 includes multiple movable push plates 61 circumferentially and equidistantly distributed on the inner side wall of the top of the aerobic tank 1. The reciprocating lifting mechanism 5 also includes multiple sets of deflecting pushing mechanisms 54 circumferentially and equidistantly distributed on the edge of the sieve plate 53. The deflecting pushing mechanisms 54 are distributed corresponding to the movable push plates 61. Each set of deflecting pushing mechanisms 54 rises and falls synchronously with the sieve plate 53. When the sieve plate 53 rises to the position of the movable push plate 61, each set of deflecting pushing mechanisms 54 causes the corresponding movable push plate 61 to deflect towards the middle of the aerobic tank 1. This facilitates the gathering of the packing material piled up at the edge towards the middle, avoiding the dead zone caused by the continuous upward aeration of the aeration device at the bottom of the aerobic tank 1, which causes the packing material to accumulate near the corner of the tank wall. This promotes the overall circulation of the packing material, effectively utilizing its function. In conjunction with the continuous up-and-down reciprocating movement of the sieve plate 53, all the packing material is fully and effectively circulated.

[0044] In some specific implementation schemes, refer to Figure 2 and Figure 3 As shown, the gathering and pushing mechanism 6 also includes a mounting ring 62 and a limiting ring 63 for limiting the lifting height of the screen plate 53. The mounting ring 62 is fixedly connected to the top of the aerobic tank 1. The movable push plates 61, which are equidistantly distributed circumferentially on the inner side of the top of the aerobic tank 1, are all vertically connected to the bottom of the mounting ring 62, and the movable push plates 61 maintain a set distance from the inner wall of the aerobic tank 1. Each movable push plate 61 can be deflected towards the center relative to the mounting ring 62. The limiting ring 63 is fixedly connected to the inner wall of the aerobic tank 1 near the top, and can be located in the space between the distributed movable push plates 61 and the inner wall of the aerobic tank 1, and is lower than the position of the mounting ring 62.

[0045] In some specific implementation schemes, refer to Figure 6 and Figure 7As shown, each set of deflection and pushing mechanisms 54 includes a shaft frame 541, a strip-shaped rotating push plate 542, and a lifting hook plate 543. The shaft frame 541 is fixedly connected to the sieve plate 53. One end of the strip-shaped rotating push plate 542 near the center of the sieve plate 53 is tilted upwards. The lifting hook plate 543 is set below the other end of the strip-shaped rotating push plate 542. An elastic connecting rope 544 is also connected between the lifting hook plate 543 and the corresponding strip-shaped rotating push plate 542. An electric telescopic rod 7 is fixedly installed on the outer side of the top of the aerobic tank 1. The telescopic end of the electric telescopic rod 7 is inserted into the aerobic tank 1 and connected to the sieve plate 53. An elastic separation mechanism is connected between the telescopic end of the electric telescopic rod 7 and the sieve plate 53. The lifting hook plate 543 and the telescopic end of the electric telescopic rod 7 rise and fall synchronously.

[0046] The elastic separation mechanism includes a connecting ring 51 and a connecting spring 55. The connecting ring 51 is fitted to the edge of the upper surface of the sieve plate 53 and is also connected to the sieve plate 53 via the connecting spring 55. The connecting ring 51 is fixedly connected to the telescopic end of the electric telescopic rod 7 via a cross-shaped bracket. The lifting hook plate 543 is fixedly connected to the inner side wall of the connecting ring 51. Both sides of the edge of the sieve plate 53 are vertically fixedly connected with limiting guide rods 52 that are aligned with and cooperate with the limiting ring 63. The limiting guide rods 52 pass through the connecting ring 51, and the connecting ring 51 can slide relative to the limiting guide rods 52. Here, the length of the limiting guide rods 52 is much greater than the thickness of the connecting ring 51.

[0047] When the electric telescopic rod 7 retracts, causing the sieve plate 53 to rise, and the limiting guide rod 52 has not yet contacted the limiting ring 63, the connecting ring 51 and the sieve plate 53 rise synchronously. When the limiting guide rod 52 abuts against the limiting ring 63, the sieve plate 53 stops, and the inclined, raised ends of the circumferentially distributed strip-shaped rotating push plates 542 are positioned on the side of the corresponding movable push plate 61 closest to the inner wall of the aerobic tank 1. At this time, the electric telescopic rod 7 continues to retract, which will cause the connecting ring 51 to rise relative to the sieve plate 53. During this process, the connecting spring 55 stretches and generates a rebound force, which ensures that the limiting guide rod 52 on the sieve plate 53 always remains in contact with the limiting ring 63. During the process of the connecting ring 51 rising relative to the sieve plate 53, the lifting hook plates 54 distributed in the inner ring of the connecting ring 51... As the connecting ring 51 rises synchronously, each lifting hook plate 543 pushes upwards on the lower end of the corresponding strip rotating push plate 542, causing the tilted end of the strip rotating push plate 542 to begin to deflect towards the horizontal position. During the deflection process, it squeezes and pushes the corresponding movable push plate 61 towards the middle position of the aerobic tank 1, thus facilitating the flow of the packing material accumulated at the edge towards the center. When the electric telescopic rod 7 extends, it first drives the connecting ring 51 to reset relative to the sieve plate 53, and then drives the connecting ring 51 and the sieve plate 53 to descend synchronously. During this process, the movable push plate 61 also rotates back to reset, and the descending lifting hook plate 543 is pulled by the elastic connecting rope 544, which facilitates the corresponding strip rotating push plate 542 to rotate back to the initial tilt position.

[0048] In a further specific implementation, in order to prevent the connecting ring 51 from falling off the limiting guide rod 52, the limiting guide rod 52 includes a main body rod and a stop head. The main body rod is connected to the screen plate 53, and the diameter of the stop head is larger than the diameter of the main body rod and is fixedly installed on the top of the main body rod, thereby preventing the connecting ring 51 from falling off.

[0049] In some specific implementation schemes, in order to clean the aging biofilm on the surface of the packing material and promote the diffusion of dissolved oxygen and pollutants into the biofilm within the packing material, each movable push plate 61 is an elastic metal plate, and the top of the movable push plate 61 is rigidly connected to the mounting fixing ring 62. During the rotation of each strip-shaped rotating push plate 542 from an inclined position to a horizontal position, it pushes the corresponding movable push plate 61, causing it to bend and deform. When the lifting hook plate 543 pushes the strip-shaped rotating push plate 542 to a horizontal position, the strip-shaped rotating push plate 542 separates from the corresponding bent and deflected movable push plate 61, and the movable push plate 61 instantly rebounds, generating oscillation. At this time, the horizontal strip-shaped... The rotating pusher plate 542 is positioned at a height lower than the bottom of the movable pusher plate 61. The vibrations generated by the movable pusher plate 61 are transmitted to the nearby packing material. The vibration energy preferentially acts on the outer layer of aged biofilm on the packing material, which has poor adhesion and is brittle, causing it to detach due to fatigue or resonance. The inner layer of newly formed bacteria, due to its strong adhesion and dense structure, is minimally affected, thus effectively assisting in the peeling off of the aged biofilm on the packing material and promoting the continued effective function of the packing material. At the same time, the vibrations generate tiny pressure waves and eddies in the surrounding water, which can disrupt the stagnant liquid film that has long existed on the surface of the packing material, promoting the diffusion of dissolved oxygen and pollutants into the interior of the biofilm. It can also assist in the diffusion of the packing material.

[0050] It should be noted that in this scheme, although the elastic movable push plate 61 is reset in advance relative to the strip rotating push plate 542, since the lifting hook plate 543 is connected to the strip rotating push plate 542 by an elastic connecting rope 544, even if the horizontal strip rotating push plate 542 is blocked by the corresponding movable push plate 61 during the process of connecting ring 51 and lifting hook plate 543 being unable to move, the elastic connecting rope 544 can be stretched and deformed during this process, ensuring that connecting ring 51 and lifting hook plate 543 can be reset normally relative to screen plate 53.

[0051] In some specific implementation schemes, to prevent the packing material from getting stuck between the movable push plate 61 and the tank wall of the aerobic tank 1, refer to Figure 11 As shown, there is a small gap between adjacent movable push plates 61, and they are almost touching each other; each movable push plate 61 has an elastic diaphragm 57 connected between its bottom and the inner wall of the aerobic tank 1, and the elastic diaphragm 57 has a strip-shaped opening 571 for the corresponding strip-shaped rotating push plate 542 to pass through. The elastic diaphragm 57 prevents the packing material from entering between the movable push plate 61 and the tank wall. Of course, for the position of the limiting guide rod 52, an avoidance hole can also be set on the corresponding elastic diaphragm 57.

[0052] Alternatively, the distance between the movable push plate 61 and the pool wall can be made smaller than the packing size, thereby preventing the packing from getting stuck.

[0053] In some specific implementations, to further promote the flow and diffusion of the packing material, refer to Figure 5As shown, each movable push plate 61 is equipped with a turning mechanism for turning the packing.

[0054] The actuation mechanism includes an actuation plate 64, a traction wire 66, and an elastic reset member 65. The actuation plate 64 is hinged to one side of the movable push plate 61 near the middle of the aerobic tank 1. One end of the traction wire 66 is connected to the actuation plate 64, specifically on the side of the actuation plate 64 away from the movable push plate 61. The other end of the traction wire 66 is connected to the limiting ring 63. The traction wire 66 can pass through the movable push plate 61. There is a certain angle between the traction wire 66 and the actuation plate 64, and the traction wire 66 remains taut. The elastic reset member 65 is connected between the movable push plate 61 and the actuation plate 64.

[0055] It should be noted that when the movable push plate 61 is a flexible metal plate, the top of the actuating plate 64 is lower than the top of the movable push plate 61, ensuring that the connection position of the movable push plate 61 near the top can be bent and deformed, preventing the actuating plate 64 from causing obstruction.

[0056] When the movable push plate 61 is pushed upwards by the strip-shaped rotating push plate 542 and deflects and tilts towards the center of the aerobic tank 1, the connected actuating plate 64 also shifts position. During this process, since the length of the traction wire 66 is fixed, the actuating plate 64 is pulled in the opposite direction under the restriction of the traction wire 66, thus deflecting tangentially relative to the movable push plate 61. This facilitates the tangential actuation of the packing material pushed towards the center by the movable push plate 61, further promoting the fluidization and diffusion of the packing material. At the same time, it also causes the packing material itself to rotate, which further promotes the transfer of dissolved oxygen and other substances to the internal biofilm, thereby increasing the diversity of packing material movement and enhancing mass transfer. During this process, the elastic reset member 65 stretches and generates a rebound force, which facilitates the reset of the actuating plate 64 when the movable push plate 61 resets.

[0057] In a further specific implementation, the elastic reset member 65 is an elastic rubber diaphragm, and is inclinedly connected at the included angle between the toggle plate 64 and the movable push plate 61.

[0058] In some specific implementation schemes, aerobic tank 1 and anoxic tank 2 are set at the same height, anaerobic tank 3 is set below aerobic tank 1, and sedimentation tank 4 is set below anoxic tank 2, so as to achieve a three-dimensional distribution and reduce site occupation.

[0059] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios:

[0060] After being treated in the anaerobic tank 3, the wastewater enters the aerobic tank 1. A biofilm forms on the packing material in the aerobic tank 1, and the packing material is constantly aerated and turned by the aeration device, which facilitates further treatment of the wastewater. During this process, the electric telescopic rod 7 continuously extends and retracts, driving the screen plate 53 to move up and down continuously in the aerobic tank 1. The screen plate 53 continuously pushes the bottom packing material upwards, eliminating the sediment at the bottom of the packing material and ensuring that all the packing material flows effectively in the tank, preventing the accumulated packing biofilm from aging, turning black, and failing due to lack of oxygen. At the same time, the up-and-down movement of the screen plate 53 can generate strong disturbance and shearing of the surrounding liquid, causing the liquid film on the surface of the packing material to be continuously peeled off and renewed, allowing fresh water and oxygen to quickly reach the surface of the biofilm.

[0061] During the upward movement of the sieve plate 53, when the limiting guide rod 52 has not yet contacted the limiting ring 63, the connecting ring 51 rises synchronously with the sieve plate 53. When the limiting guide rod 52 abuts against the limiting ring 63, the sieve plate 53 stops, and the inclined, raised ends of the circumferentially distributed strip-shaped rotating push plates 542 are positioned on the side of the corresponding movable push plate 61 closest to the inner wall of the aerobic tank 1. At this time, the electric telescopic rod 7 continues to retract, which will drive the connecting ring 51 to rise relative to the sieve plate 53. During this process, the connecting spring 55 stretches and generates a rebound force, which ensures that the limiting guide rod 52 on the sieve plate 53 always remains in contact with the limiting ring 63. During the upward movement of the connecting ring 51 relative to the sieve plate 53, the inclined, raised ends of the circumferentially distributed strip-shaped rotating push plates 542 are positioned on the side of the corresponding movable push plate 61 closest to the inner wall of the aerobic tank 1. The lifting hook plate 543 of the inner ring of the connecting ring 51 rises synchronously with the connecting ring 51. Each lifting hook plate 543 pushes the lower end of the corresponding strip rotating push plate 542 upward, causing the inclined and raised end of the strip rotating push plate 542 to begin to deflect to a horizontal position. During the deflection process, it squeezes the corresponding movable push plate 61 to deflect towards the middle position of the aerobic tank 1, thereby facilitating the flow of the packing material accumulated at the edge position towards the middle. That is, it pushes the packing material accumulated at the edge position towards the middle to gather, avoiding the dead zone caused by the continuous upward aeration of the aeration device at the bottom of the aerobic tank 1, which causes the packing material to accumulate at the corners near the tank wall. This promotes the overall circulation and flow of the packing material, effectively exerting the function of the packing material.

[0062] Furthermore, when the movable push plate 61 is pushed upwards towards the center of the aerobic tank 1 by the strip rotating push plate 542, the connected actuating plate 64 is also shifted in position. During this process, since the length of the traction wire 66 is fixed, the actuating plate 64 is pulled in the opposite direction under the restriction of the traction wire 66, thus causing a tangential deflection relative to the movable push plate 61. This facilitates the tangential actuation of the packing material that is pushed towards the center by the movable push plate 61, further promoting the fluidization and diffusion of the packing material. At the same time, it also causes the packing material itself to rotate, which further promotes the transfer of dissolved oxygen and other substances to the internal biofilm.

[0063] When the lifting hook plate 543 pushes the strip rotating push plate 542 to a horizontal position, the strip rotating push plate 542 separates from the corresponding bending and deflecting movable push plate 61. Since the movable push plate 61 is an elastic metal plate, it rebounds instantly and generates vibration. The vibration will transmit vibration energy to the nearby packing material. The vibration energy will preferentially act on the outer aged biofilm with poor adhesion and high brittleness on the packing material, causing it to fall off due to fatigue or resonance. The inner new bacterial community is minimally affected due to its strong adhesion and dense structure, which effectively assists in peeling off the aged biofilm on the packing material, promoting the packing material to continue to play an effective role. At the same time, the vibration will generate small pressure waves and eddies in the surrounding water, which can destroy the stagnant liquid film that has been present on the surface of the packing material for a long time, promote the diffusion of dissolved oxygen and pollutants into the interior of the biofilm, and also assist the packing material to spread out.

[0064] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An integrated domestic wastewater treatment device coupling AOA and MBBR processes, comprising an anaerobic tank (3), an aerobic tank (1), an anoxic tank (2), and a sedimentation tank (4), wherein the anaerobic tank (3), aerobic tank (1), anoxic tank (2), and sedimentation tank (4) are sequentially connected, characterized in that, Also includes: A reciprocating lifting mechanism (5) includes a sieve plate (53), which is used to push packing material in a longitudinal reciprocating motion within the aerobic tank (1). The gathering and pushing mechanism (6) includes multiple movable push plates (61) circumferentially distributed at equal intervals on the inner side wall of the top of the aerobic tank (1). The reciprocating lifting mechanism (5) also includes multiple deflection pushing mechanisms (54) circumferentially distributed at equal intervals on the edge of the sieve plate (53). The deflection pushing mechanism (54) is distributed corresponding to the movable push plates (61). Each deflection pushing mechanism (54) is raised and lowered synchronously with the sieve plate (53). When the sieve plate (53) is raised to the position of the movable push plate (61), each deflection pushing mechanism (54) causes the corresponding movable push plate (61) to deflect and push the packing material towards the middle position of the aerobic tank (1). The gathering and pushing mechanism (6) further includes a mounting and fixing ring (62) and a limiting ring (63) for limiting the rising height of the sieve plate (53). The mounting and fixing ring (62) is fixedly connected to the top of the aerobic tank (1). The movable push plates (61) distributed equidistantly on the inner side of the top of the aerobic tank (1) are all vertically connected to the bottom of the mounting and fixing ring (62), and there is a gap between the movable push plates (61) and the inner wall of the aerobic tank (1). The limiting ring (63) is fixedly connected to the inner wall of the aerobic tank (1) near the top. Each of the deflection and pushing mechanisms (54) includes a shaft frame (541), a strip rotating push plate (542), and a lifting hook plate (543). The shaft frame (541) is fixedly connected to the sieve plate (53). The end of the strip rotating push plate (542) near the center of the sieve plate (53) is tilted and raised. The lifting hook plate (543) is set below the other end of the strip rotating push plate (542). An elastic connecting rope (544) is also connected between the lifting hook plate (543) and the corresponding strip rotating push plate (542). An electric telescopic rod (7) is fixedly installed on the outer side of the top of the aerobic tank (1). An elastic separation mechanism is connected between the telescopic end of the electric telescopic rod (7) and the sieve plate (53). The lifting hook plate (543) and the telescopic end of the electric telescopic rod (7) rise and fall synchronously. The elastic separation mechanism includes a connecting ring (51) and a connecting spring (55). The connecting ring (51) is fitted to the edge of the upper surface of the sieve plate (53), and the connecting ring (51) is also connected to the sieve plate (53) through the connecting spring (55). The connecting ring (51) is fixedly connected to the telescopic end of the electric telescopic rod (7). The lifting hook plate (543) is fixedly connected to the inner ring side wall of the connecting ring (51). Both sides of the edge of the sieve plate (53) are vertically fixedly connected with a limiting guide rod (52) that aligns with the limiting ring (63), and the limiting guide rod (52) passes through the connecting ring (51). Each of the movable push plates (61) is an elastic metal plate, and the top of the movable push plate (61) is rigidly connected to the mounting fixing ring (62). When the lifting hook plate (543) pushes the strip rotating push plate (542) to rotate to the horizontal position, the strip rotating push plate (542) separates from the corresponding deflected movable push plate (61), and the movable push plate (61) rebounds and generates oscillation.

2. The integrated domestic wastewater treatment equipment coupling AOA and MBBR processes according to claim 1, characterized in that, The limiting guide rod (52) includes a main rod and a stop head. The main rod is connected to the sieve plate (53). The diameter of the stop head is larger than that of the main rod and is fixedly installed on the top of the main rod.

3. The integrated domestic wastewater treatment equipment coupling AOA and MBBR processes according to claim 1, characterized in that, Each of the movable push plates (61) is connected to an elastic diaphragm (57) between its bottom and the inner wall of the aerobic tank (1), and the elastic diaphragm (57) is provided with a strip-shaped opening (571) through which the corresponding strip-shaped rotating push plate (542) passes.

4. The integrated domestic wastewater treatment equipment coupling AOA and MBBR processes according to claim 2, characterized in that, Each of the movable push plates (61) is provided with a pushing mechanism for pushing the packing.

5. An integrated domestic wastewater treatment device coupling AOA and MBBR processes according to claim 4, characterized in that, The actuation mechanism includes an actuation plate (64), a traction wire (66), and an elastic reset member (65). The actuation plate (64) is rotatably connected to the side of the movable push plate (61) near the middle of the aerobic tank (1) by a hinge. One end of the traction wire (66) is connected to the actuation plate (64), and the other end is connected to the limiting ring (63). The elastic reset member (65) is connected between the movable push plate (61) and the actuation plate (64).

6. An integrated domestic wastewater treatment device coupling AOA and MBBR processes according to claim 5, characterized in that, The elastic reset member (65) is an elastic rubber diaphragm and is inclinedly connected at the angle between the toggle plate (64) and the movable push plate (61).

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