Aerobic granular sludge precipitation screening device and micro-aerobic aeration tank

Abstract

The invention relates to the technical field of water treatment devices, and particularly provides an aerobic granular sludge precipitation screening device which comprises a particle generator, a forced water inlet system, a water outlet system and a sludge discharge system. The continuous flow aerobic granular sludge precipitation screening device has the beneficial effects that the sludge screening strength is improved by improving the water inlet load of the partial continuous flow aerobic granular sludge precipitation screening device; the light flocculent sludge is actively eliminated so as to improve the particle proportion, and controllable discharge of the light flocculent sludge is realized.

Description

Technical Field

[0001] The invention relates to the technical field of water treatment devices, in particular to an aerobic granular sludge precipitation and screening device and a micro-aerobic aeration tank. Background Art

[0002] With the increasing shortage of water resources and water pollution, the emission standards are becoming more and more stringent, and the sewage treatment process is constantly being updated. Compared with traditional activated sludge, aerobic granular sludge, as an emerging sewage treatment technology, is a granular sludge formed by microorganisms self-aggregating under aerobic conditions, and the aerobic, anoxic, and anaerobic microenvironments of the outer, middle, and inner layers of each granular sludge are used to remove organic matter, nitrogen, and phosphorus. Aerobic granular sludge is a granular sludge formed by microorganisms self-aggregating under aerobic conditions. It has outstanding advantages such as compact structure, good sedimentation performance, good treatment effect, and can remove toxic and harmful substances while removing nitrogen and phosphorus, and has a good application prospect.

[0003] However, the sequencing batch aerobic granular sludge process is more suitable for new projects, which limits the development of this technology. Compared with the sequencing batch aerobic granular sludge process, the reaction pool of the continuous flow aerobic granular process has a wide range of applicability, can be newly built, in-situ transformation, lower construction cost, and greater monomer treatment capacity, and has great application prospects in the future.

[0004] At present, the continuous flow aerobic granular sludge treatment technology is still in the research and development stage. The research direction is mainly focused on the enrichment of aerobic granules and the improvement of treatment effect. Granular sludge is cultivated by using the principles of hunger, satiation, shear force, and selection pressure. Most of the equipment and devices use the method of installing equipment or devices in the biochemical pool to promote the formation of aerobic granular sludge, which generally requires multiple equipment or devices.

[0005] At present, in practical engineering applications, the practical problems that need to be solved are mainly concentrated in: 1. How to actively eliminate light flocculent sludge to increase the proportion of particles; 2. How to achieve controllable discharge of lightweight flocculent sludge.

[0006] In the prior art, there are relatively few aerobic granular sludge reactors that can actively eliminate lightweight flocculent sludge. Basically, they are operated according to a predetermined design plan and cannot flexibly and actively eliminate lightweight flocculent sludge, which greatly reduces the operating effect.

[0007] CN117326696A discloses a continuous flow aerobic granular sludge sewage treatment system, which mentions that a separation box is provided at the water outlet, and a plurality of three-phase separators are provided inside the box. After separation by the three-phase separators, the heavy granular sludge is retained and the light flocculent sludge is discharged. However, in the actual operation process, whether the discharge of the light flocculent sludge can be achieved is related to factors such as the pollutant load, hydraulic load, and degree of granulation, which can easily lead to operation failure. Moreover, the discharge of the light flocculent sludge still requires further mud-water separation, which has no economic advantage.

[0008] CN118047479A continuous flow aerobic granular sludge biochemical sewage treatment system and its treatment method mentions that a selection clarifier is installed inside the third biochemical reaction tank to separate the mud-water mixture into aerobic granular sludge, intermediate clear liquid and supernatant liquid, and the intermediate clear liquid (mixed liquid containing some flocculent sludge) is returned to the second reaction tank, and the flocculent sludge is eliminated by the starvation condition of the second reaction tank. In the actual operation process, whether a clear boundary between the supernatant liquid, intermediate clear liquid and aerobic granular sludge can be formed cannot be controlled, and the flocculent sludge cannot be effectively eliminated.

[0009] CN117023799A, a device and method for rapid cultivation of aerobic granular sludge in continuous flow, mentions that a sedimentation zone is provided at the upper right of the last aerobic zone, and a sludge collecting bucket is provided at the lower right of the last aerobic zone. The sludge is screened by adjusting the baffle to control the residence time in the sedimentation zone, and the light flocculent sludge is discharged through the outlet. In the process of implementation and application, it is generally necessary to set up multiple sedimentation zones, and the mechanical operation intensity of adjusting the residence time in the sedimentation zone is large, and the practicality is not strong. Moreover, the discharge of light flocculent sludge still requires further mud and water separation, which has no economic advantage. How to solve the problems in the prior art more economically has become an urgent need for those skilled in the art.

[0010] The present application proposes a continuous flow aerobic granular sludge sedimentation and screening device, which is installed in the micro-aerobic aeration tank of the continuous flow aerobic granular sludge reactor. The device can actively eliminate light flocculent sludge to increase the proportion of particles by adjusting the water inlet intensity of the device; at the same time, the light flocculent sludge can be discharged in a controlled manner to avoid the enrichment of light flocculent sludge in the biochemical tank, or the overall sedimentation of the system sludge is poor due to too much light flocculent sludge, thereby causing sludge running in the biochemical system and affecting the deep treatment effect.

[0011] At the same time, the technical solution of the present application can increase the proportion of granular sludge and the treatment effect of the continuous flow aerobic granular sludge system, save secondary sedimentation tanks, and reduce equipment investment. Summary of the invention

[0012] The technical problem to be solved by the present invention is to provide an aerobic granular sludge precipitation and screening device, which solves the problems existing in the prior art.

[0013] The invention discloses an aerobic granular sludge precipitation and screening device, comprising a granular generator, a forced water inlet system, a water outlet system, and a sludge discharge system; The particle generator includes a box body, one or more sludge hoppers, and a water inlet system; the sludge hopper is a bucket-shaped structure with an upper opening larger than a lower opening, the upper opening of the sludge hopper is directly connected to the lower opening of the box body, and the sludge hopper is used to accommodate aerobic granular sludge; the outlet of the water inlet system is arranged inside the sludge hopper, and the inlet of the water inlet system is arranged outside the particle generator, for introducing water into the particle generator; The forced water inlet system is arranged at the inlet of the water inlet system, and is used to forcibly enhance the water flow of the water inlet system; The sludge discharge system includes a sludge collection pipe, a sludge discharge pipe, and a sludge discharge power device; one end of the sludge collection pipe is arranged in the middle of the box body, and the other end is connected to the sludge discharge pipe; the sludge discharge pipe is U-shaped, and the sludge discharge power device is connected to it for discharging light flocculent sludge.

[0014] Preferably, the water inlet system is of U-shaped design with the opening facing downward.

[0015] More preferably, the water inlet system includes a water inlet chamber and a diversion chamber; the water inlet chamber is a cavity structure with an opening at the bottom, a water inlet is provided at the upper position of the water inlet chamber, and the water inlet chamber is connected to the inlet of the diversion chamber through the water inlet; the water inlet chamber is arranged outside the particle generator, the diversion chamber is arranged inside the particle generator, and the bottom opening of the diversion chamber is arranged inside the sludge hopper.

[0016] More preferably, the water inlet cavity and the flow guide cavity share the side wall of the box body, and the flow guide cavity is a space enclosed by the side wall of the box body and the flow guide plate arranged inside the box body. Preferably, the forced water inlet system comprises a first air inlet pipe, and the first air inlet pipe is arranged at the inlet of the water inlet system.

[0017] Furthermore, a gas diffuser is provided at the end of the first air intake pipe.

[0018] Preferably, the first air inlet pipe extends from the lower side wall of the water inlet chamber into the water inlet chamber, and a gas diffuser is provided at the end of the first air inlet pipe; Preferably, the water outlet system includes a water collecting tank, which is arranged at the upper part of the box body, and the treated water is collected in the water collecting tank and discharged through a pipeline.

[0019] Furthermore, the other end of the first air inlet pipe is connected to a blower.

[0020] Preferably, the sludge collection pipe includes a first pipe and a second pipe, the first pipe and the second pipe are connected in a T-shape, the middle of the first pipe is connected to the second pipe, and the other end of the second pipe is connected to the sludge discharge pipe.

[0021] Preferably, the sludge discharge power device includes a second air inlet pipe, which utilizes airflow to drive the light flocculent sludge to be discharged.

[0022] Furthermore, a regulating valve is provided on the first air intake pipe.

[0023] Furthermore, a regulating valve is provided on the second air intake pipe.

[0024] Furthermore, the surface load of the particle generator is 1 to 5 m 3 / (m 2 ·h).

[0025] Furthermore, the box body is a rectangular structure when viewed from above.

[0026] Furthermore, the particle generator also includes a mud level meter, which is installed inside the box to monitor the height of the mud layer.

[0027] Furthermore, the liquid level of the mud level meter is interlocked with the start switch of the mud discharge power device. When the mud layer is detected to reach a preset height, the mud discharge power device is automatically turned on to discharge the mud.

[0028] The invention also discloses a micro-aerobic aeration tank, comprising one or more aerobic granular sludge sedimentation and screening devices and an aeration tank; the aerobic granular sludge sedimentation and screening devices are arranged at an upper position inside the aeration tank.

[0029] Furthermore, the aeration tank includes a tank body, an aeration system, and a water inlet pipe; the aeration system includes an aeration pipe and an aeration plate arranged at the bottom of the tank body, and the aeration plate is connected to the aeration pipe; the water inlet pipe is arranged at a lower position of the side wall of the tank body.

[0030] Preferably, the water inlet chamber is arranged at a position away from the water inlet pipe of the pool body.

[0031] Furthermore, the aeration tank inlet water is the anaerobic tank outlet water. The main processes are simultaneous nitrification and denitrification, short-range nitrification and denitrification, denitrification phosphorus removal, aerobic excess phosphorus uptake and organic matter degradation.

[0032] Furthermore, the flow pattern of the aeration tank adopts plug flow.

[0033] Preferably, the DO at the middle and front ends is controlled within 0.5 mg / L, and the end is controlled within 1.0-2.0 mg / L.

[0034] Preferably, the sludge concentration in the micro-aerobic aeration tank is 6000~8000 mg / L.

[0035] The continuous flow aerobic granular sludge sedimentation and screening device has two operating conditions: 1. When the proportion of aerobic granular sludge is high, the sludge sedimentation is good, the effluent from each device is clear or there is no need to discharge excess sludge, each continuous flow aerobic granular sludge sedimentation and screening device has an average water inflow, and at this time, the operating conditions of each continuous flow aerobic granular sludge sedimentation and screening device are consistent; 2. When the proportion of aerobic granular sludge is low, the sludge sedimentation is poor, the effluent from each device is turbid, or the residual sludge needs to be discharged, the forced water inlet system of one or more continuous flow aerobic granular sludge sedimentation and screening devices is opened (the forced water inlet system is an air lift system, and the regulating valve on the compressed air pipe is opened to open the forced water inlet system. At this time, the sewage is lifted by air, the liquid level rises, and the flow rate entering the particle generator increases.) One or more continuous flow aerobic granular sludge sedimentation and screening devices are overloaded with water. At this time, the overloaded continuous flow aerobic granular sludge sedimentation and screening device has a large water inlet volume, a high mud layer, and increased sludge screening intensity. The upper part of the mud layer is mainly composed of light flocculent sludge. When the mud level meter detects that the mud layer reaches the preset height (the mud discharge level is set above the sludge collection pipe), the regulating valve is automatically opened to discharge the mud and discharge the light flocculent sludge. In this way, the light flocculent sludge is discharged to retain the aerobic granular sludge and increase the proportion of granular sludge. The supernatant on the upper part of the mud layer is discharged from the sump. On the other hand, because one or more continuous flow aerobic granular sludge sedimentation and screening devices are overloaded with water, the water inlet of other multiple continuous flow aerobic granular sludge sedimentation and screening devices is reduced, the surface load is low, and the effluent is clear, which can ensure the overall effluent clarity and reduce the back-end processing pressure.

[0036] The beneficial effects of the present invention are: 1. Increase the sludge screening intensity by increasing the water inlet load of some continuous flow aerobic granular sludge sedimentation and screening devices; 2. Actively eliminate light flocculent sludge by opening the sludge discharge system to increase the particle ratio and achieve controllable discharge of light flocculent sludge; 3. Through the interlocking control of the mud level meter and the compressed air regulating valve of the mud discharge system, automatic mud discharge is achieved to ensure the continuous and stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 Structure diagram of aerobic granular sludge sedimentation and screening device; Figure 2 Particle generator structure diagram; Figure 3 Structural diagram of forced water inlet system; Figure 4 Structural diagram of mud discharge system; Figure 5Sludge collection pipe structure diagram; Figure 6 Micro-aerobic aeration tank structure diagram; Figure 7 Equipment layout diagram of the embodiment. DETAILED DESCRIPTION

[0038] The specific implementation modes of the present invention are further described below in conjunction with the embodiments and drawings. The following embodiments are only used to more clearly illustrate the technical embodiments of the present invention and are not intended to limit the protection scope of the present invention.

[0039] Embodiment 1: The present invention discloses an aerobic granular sludge precipitation and screening device, the aerobic granular sludge precipitation and screening device comprises a granule generator 1, a forced water inlet system 2, a water outlet system 3, and a sludge discharge system 4; The particle generator 1 includes a box body 11, one or more sludge hoppers 12, and a water inlet system 13; the sludge hopper 12 is a bucket-shaped structure with an upper opening larger than a lower opening, and the upper opening of the sludge hopper 12 is directly connected to the lower opening of the box body 11, and the sludge hopper 12 is used to accommodate aerobic granular sludge; the outlet of the water inlet system 13 is arranged inside the sludge hopper 12, and the inlet of the water inlet system 13 is arranged outside the particle generator 1, and is used to introduce water into the particle generator 1; The forced water inlet system 2 is arranged at the inlet of the water inlet system 13, and is used to forcibly increase the water flow of the water inlet system 13; The sludge discharge system 4 includes a sludge collecting pipe 41, a sludge discharge pipe 42, and a sludge discharge power device 43; one end of the sludge collecting pipe 41 is arranged in the middle of the box body, and the other end is connected to the sludge discharge pipe 42; the sludge discharge pipe 42 is U-shaped, and the sludge discharge power device 43 is connected to it for discharging light flocculent sludge.

[0040] The present invention further discloses a micro-aerobic aeration tank, comprising one or more aerobic granular sludge sedimentation and screening devices 100 and an aeration tank 200 ; the aerobic granular sludge sedimentation and screening devices 100 are arranged at an upper position inside the aeration tank 200 .

[0041] In the present embodiment, the aeration tank 200 includes a tank body 201, an aeration system 202, and a water inlet pipe 203; the aeration system 202 includes an aeration pipe 2021 and an aeration plate 2022 disposed at the bottom of the tank body 201, and the aeration plate 2022 is connected to the aeration pipe 2021; the water inlet pipe 203 is disposed at a lower position on the side wall of the tank body 201.

[0042] In this embodiment, the water inlet chamber 131 is arranged at the position of the water inlet pipe 203 of the pool body 201.

[0043] In this embodiment, the aeration tank inlet water is the anaerobic tank outlet water. The main processes are simultaneous nitrification and denitrification, short-range nitrification and denitrification, denitrification phosphorus removal, aerobic excess phosphorus uptake and organic matter degradation.

[0044] In this embodiment, the flow state of the aeration tank adopts plug flow.

[0045] In this embodiment, the DO at the front end is controlled within 0.5 mg / L, and the end is controlled within 1.0-2.0 mg / L.

[0046] In the present embodiment, the sludge concentration in the micro-aerobic aeration tank is 6000-8000 mg / L.

[0047] Embodiment 2: The present invention discloses an aerobic granular sludge precipitation and screening device, the aerobic granular sludge precipitation and screening device comprises a granule generator 1, a forced water inlet system 2, a water outlet system 3, and a sludge discharge system 4; The particle generator 1 includes a box body 11, one or more sludge hoppers 12, and a water inlet system 13; the sludge hopper 12 is a bucket-shaped structure with an upper opening larger than a lower opening, and the upper opening of the sludge hopper 12 is directly connected to the lower opening of the box body 11, and the sludge hopper 12 is used to accommodate aerobic granular sludge; the outlet of the water inlet system 13 is arranged inside the sludge hopper 12, and the inlet of the water inlet system 13 is arranged outside the particle generator 1, and is used to introduce water into the particle generator 1; The forced water inlet system 2 is arranged at the inlet of the water inlet system 13, and is used to forcibly increase the water flow of the water inlet system 13; The sludge discharge system 4 includes a sludge collection pipe 41, a sludge discharge pipe 42, and a sludge discharge power device 43; one end of the sludge collection pipe 41 is arranged in the middle of the box body, and the other end is connected to the sludge discharge pipe 42; the sludge discharge pipe 42 is U-shaped, and the sludge discharge power device 43 is connected to it for discharging light flocculent sludge; The water inlet system 13 is a U-shaped design with an opening downward; the water inlet system 13 includes a water inlet chamber 131 and a diversion chamber 132; the water inlet chamber 131 is a cavity-shaped structure with an opening at the bottom, and a water inlet 1311 is provided at the upper position of the water inlet chamber 131, and the water inlet chamber 131 is connected to the inlet of the diversion chamber 132 through the water inlet 1311; the water inlet chamber 131 is arranged outside the particle generator 1, the diversion chamber 132 is arranged inside the particle generator 1, and the bottom opening of the diversion chamber 132 is arranged inside the sludge hopper 12; The water inlet cavity 131 and the flow guide cavity 132 share the side wall of the box body 11, and the flow guide cavity 132 is a space enclosed by the side wall of the box body 11 and a flow guide plate 133 disposed inside the box body 11; The sludge collection pipe 41 includes a first pipe 411 and a second pipe 412 . The first pipe 411 and the second pipe 412 are connected in a T-shape. The middle of the first pipe 411 is connected to the second pipe 412 , and the other end of the second pipe 412 is connected to the sludge discharge pipe 42 .

[0048] The present invention further discloses a micro-aerobic aeration tank, comprising one or more aerobic granular sludge sedimentation and screening devices 100 and an aeration tank 200 ; the aerobic granular sludge sedimentation and screening devices 100 are arranged at an upper position inside the aeration tank 200 .

[0049] In this embodiment, the water inlet chamber 131 is arranged at the position of the water inlet pipe 203 of the pool body 201.

[0050] In this embodiment, the aeration tank inlet water is the anaerobic tank outlet water. The main processes are simultaneous nitrification and denitrification, short-range nitrification and denitrification, denitrification phosphorus removal, aerobic excess phosphorus uptake and organic matter degradation.

[0051] In this embodiment, the flow state of the aeration tank adopts plug flow.

[0052] In this embodiment, the DO at the front end is controlled within 0.5 mg / L, and the end is controlled within 1.0-2.0 mg / L.

[0053] In the present embodiment, the sludge concentration in the micro-aerobic aeration tank is 6000-8000 mg / L.

[0054] Embodiment 3: The present invention discloses an aerobic granular sludge precipitation and screening device, the aerobic granular sludge precipitation and screening device comprises a granule generator 1, a forced water inlet system 2, a water outlet system 3, and a sludge discharge system 4; The particle generator 1 includes a box body 11, one or more sludge hoppers 12, and a water inlet system 13; the sludge hopper 12 is a bucket-shaped structure with an upper opening larger than a lower opening, and the upper opening of the sludge hopper 12 is directly connected to the lower opening of the box body 11, and the sludge hopper 12 is used to accommodate aerobic granular sludge; the outlet of the water inlet system 13 is arranged inside the sludge hopper 12, and the inlet of the water inlet system 13 is arranged outside the particle generator 1, and is used to introduce water into the particle generator 1; The forced water inlet system 2 is arranged at the inlet of the water inlet system 13, and is used to forcibly increase the water flow of the water inlet system 13; The sludge discharge system 4 includes a sludge collecting pipe 41, a sludge discharge pipe 42, and a sludge discharge power device 43; one end of the sludge collecting pipe 41 is arranged in the middle of the box body, and the other end is connected to the sludge discharge pipe 42; the sludge discharge pipe 42 is U-shaped, and the sludge discharge power device 43 is connected to it for discharging light flocculent sludge.

[0055] The water inlet system 13 is a U-shaped design with an opening downward; the water inlet system 13 includes a water inlet chamber 131 and a diversion chamber 132; the water inlet chamber 131 is a cavity-shaped structure with an opening at the bottom, and a water inlet 1311 is provided at the upper position of the water inlet chamber 131, and the water inlet chamber 131 is connected to the inlet of the diversion chamber 132 through the water inlet 1311; the water inlet chamber 131 is arranged outside the particle generator 1, the diversion chamber 132 is arranged inside the particle generator 1, and the bottom opening of the diversion chamber 132 is arranged inside the sludge hopper 12; The water inlet cavity 131 and the flow guide cavity 132 share the side wall of the box body 11 . The flow guide cavity 132 is a space enclosed by the side wall of the box body 11 and a flow guide plate 133 disposed inside the box body 11 .

[0056] The forced water inlet system 2 includes a first air inlet pipe 21, which is arranged at the inlet of the water inlet system 13; the first air inlet pipe 21 extends from the lower side wall of the water inlet cavity 131 into the water inlet cavity 131, and a gas diffuser 22 is arranged at the end of the first air inlet pipe 21; The water outlet system 3 includes a water collecting tank, which is arranged on the upper part of the box body 11. The treated water is collected from the water collecting tank and discharged through a pipeline.

[0057] The other end of the first air inlet pipe 21 is connected to the blower.

[0058] The sludge collection pipe 41 includes a first pipe 411 and a second pipe 412 . The first pipe 411 and the second pipe 412 are connected in a T-shape. The middle of the first pipe 411 is connected to the second pipe 412 , and the other end of the second pipe 412 is connected to the sludge discharge pipe 42 .

[0059] The mud discharge power device 43 adopts a second air inlet pipe, on which a regulating valve is provided. The liquid level of the mud level gauge 5 is interlocked with the start switch of the mud discharge power device 43. When the mud layer reaches a preset height, the mud discharge power device 43 is automatically turned on to discharge mud.

[0060] In this embodiment, the surface load of the particle generator 1 is 1 to 5 m 3 / (m 2 ·h).

[0061] In this embodiment, the box body 11 is a rectangular structure when viewed from above.

[0062] In this embodiment, the particle generator 1 further includes a mud level meter 5 , which is installed inside the box 11 to monitor the height of the mud layer.

[0063] In this embodiment, the liquid level of the mud level meter 5 is interlocked with the start switch of the mud discharge power device 43. When the mud layer reaches a preset height, the mud discharge power device 43 is automatically turned on to discharge mud.

[0064] The present invention further discloses a micro-aerobic aeration tank, comprising one or more aerobic granular sludge sedimentation and screening devices 100 and an aeration tank 200 ; the aerobic granular sludge sedimentation and screening devices 100 are arranged at an upper position inside the aeration tank 200 .

[0065] In the present embodiment, the aeration tank 200 includes a tank body 201, an aeration system 202, and a water inlet pipe 203; the aeration system 202 includes an aeration pipe 2021 and an aeration plate 2022 disposed at the bottom of the tank body 201, and the aeration plate 2022 is connected to the aeration pipe 2021; the water inlet pipe 203 is disposed at a lower position on the side wall of the tank body 201.

[0066] In this embodiment, the water inlet chamber 131 is arranged at the position of the water inlet pipe 203 of the pool body 201.

[0067] In this embodiment, the aeration tank inlet water is the anaerobic tank outlet water. The main processes are simultaneous nitrification and denitrification, short-range nitrification and denitrification, denitrification phosphorus removal, aerobic excess phosphorus uptake and organic matter degradation.

[0068] In this embodiment, the flow state of the aeration tank adopts plug flow.

[0069] In this embodiment, the DO at the front end is controlled within 0.5 mg / L, and the end is controlled within 1.0-2.0 mg / L.

[0070] In the present embodiment, the sludge concentration in the micro-aerobic aeration tank is 6000-8000 mg / L.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An aerobic granular sludge precipitation and screening device, characterized in that: An aerobic granular sludge sedimentation and screening device comprises a granular generator (1), a forced water inlet system (2), a water outlet system (3), and a sludge discharge system (4); The particle generator (1) comprises a housing (11), one or more sludge hoppers (12), and a water inlet system (13); the sludge hopper (12) is a hopper-shaped structure with an upper opening larger than a lower opening, the upper opening of the sludge hopper (12) is directly connected to the lower opening of the housing (11), and the sludge hopper (12) is used to contain aerobic granular sludge; the outlet of the water inlet system (13) is arranged inside the sludge hopper (12), and the inlet of the water inlet system (13) is arranged outside the particle generator (1), and is used to introduce water into the particle generator (1); The forced water inlet system (2) is arranged at the inlet of the water inlet system (13) and is used to forcibly increase the water flow of the water inlet system (13); The sludge discharge system (4) comprises a sludge collection pipe (41), a sludge discharge pipe (42), and a sludge discharge power device (43); one end of the sludge collection pipe (41) is arranged in the middle of the box body, and the other end is connected to the sludge discharge pipe (42); the sludge discharge pipe (42) is U-shaped, and is connected to the sludge discharge power device (43) for discharging light flocculent sludge.

2. The aerobic granular sludge precipitation and screening device according to claim 1, characterized in that: The water inlet system (13) is of U-shaped design with an opening facing downward.

3. The aerobic granular sludge precipitation and screening device according to claim 2, characterized in that: The water inlet system (13) comprises a water inlet chamber (131) and a diversion chamber (132); the water inlet chamber (131) is a cavity-shaped structure with an opening at the bottom, a water inlet (1311) is provided at the upper portion of the water inlet chamber (131), and the water inlet chamber (131) and the inlet of the diversion chamber (132) are connected via the water inlet (1311); the water inlet chamber (131) is arranged outside the particle generator (1), the diversion chamber (132) is arranged inside the particle generator (1), and the bottom opening of the diversion chamber (132) is arranged inside the sludge hopper (12).

4. The aerobic granular sludge precipitation and screening device according to claim 3, characterized in that: The water inlet chamber (131) and the flow guide chamber (132) share the side wall of the box body (11); the flow guide chamber (132) is a space enclosed by the side wall of the box body (11) and a flow guide plate (133) arranged inside the box body (11).

5. The aerobic granular sludge precipitation and screening device according to claim 1, characterized in that: The forced water inlet system (2) comprises a first air inlet pipe (21), the first air inlet pipe (21) being arranged at the inlet of the water inlet system (13), and a gas diffuser (22) being arranged at the end of the first air inlet pipe (21).

6. The aerobic granular sludge precipitation and screening device according to claim 5, characterized in that: The sludge collection pipe (41) comprises a first pipe (411) and a second pipe (412); the first pipe (411) and the second pipe (412) are connected in a T-shape; the middle of the first pipe (411) is connected to the second pipe (412); and the other end of the second pipe (412) is connected to the sludge discharge pipe (42).

7. The aerobic granular sludge precipitation and screening device according to any one of claims 1 to 6, characterized in that: The particle generator (1) further comprises a mud level meter (5), wherein the mud level meter (5) is installed inside the box (11) and is used to monitor the height of the mud layer.

8. The aerobic granular sludge precipitation and screening device according to claim 7, characterized in that: The liquid level of the mud level meter (5) is interlocked with the start switch of the mud discharge power device (43), and when the mud layer is detected to reach a preset height, the mud discharge power device (43) is automatically turned on to discharge the mud.

9. A micro-oxygen aeration tank, characterized in that: It comprises one or more aerobic granular sludge sedimentation and screening devices (100) according to any one of claims 1 to 8 and an aeration tank (200); the aerobic granular sludge sedimentation and screening device (100) is arranged at an upper position inside the aeration tank (200).

10. The micro-oxygen aeration tank according to claim 9, characterized in that: The aeration tank (200) comprises a tank body (201), an aeration system (202), and a water inlet pipe (203); the aeration system (202) comprises an aeration pipe (2021) and an aeration plate (2022) arranged at the bottom of the tank body (201), the aeration plate (2022) being connected to the aeration pipe (2021); and the water inlet pipe (203) is arranged at a lower position of a side wall of the tank body (201).

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