Continuous flow aerobic granular sludge reaction device and process

Abstract

The invention belongs to the technical field of sewage treatment, particularly relates to a continuous flow aerobic granular sludge reaction device and process, and provides a continuous flow aerobic granular sludge reaction device and process aiming at the problem that the requirement of high emission standard is difficult to meet in the prior art. The micro-aerobic zone is communicated with the aerobic zone, spiral-flow aeration systems are uniformly distributed in the micro-aerobic zone, microporous aeration systems are uniformly arranged in the aerobic zone, and a plurality of aerobic granular sludge rapid granulation devices are mounted above the aerobic zone, so that rapid culture of the aerobic granular sludge and stable, efficient and low-cost continuous operation of an aerobic granular sludge technology can be realized.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a continuous flow aerobic granular sludge reaction device and process. Background Art

[0002] The intensification of environmental pollution and water eutrophication problems has forced more and more countries and regions to formulate strict emission standards. Realizing simultaneous carbon reduction, nitrogen removal and phosphorus removal in wastewater treatment has become a hot topic and difficulty in the field of wastewater treatment research.

[0003] A microaerobic environment refers to a reaction system in which the dissolved oxygen concentration is within the range of 0.3 mg / L1.0 mg / L. Due to the participation of trace oxygen, anaerobic bacteria, aerobic bacteria, and facultative anaerobic bacteria coexist in the reactor. The abundance of the bacterial community is significantly higher than that in aerobic and anaerobic environments, and oxidation and reduction reactions can occur simultaneously.

[0004] The traditional aerobic activated sludge process has problems such as low biomass, poor shock load resistance, large sludge output, large footprint, long sludge residence time, poor sludge settling performance, and inability to simultaneously remove organic matter, nitrogen, phosphorus and other pollutants, making it difficult to meet the needs of high emission standards.

[0005] Aerobic granular sludge is a compact and regular-shaped biological focus formed by the self-agglomeration of activated sludge microorganisms under specific hydraulic conditions. It has a dense layered structure, forming anaerobic, anoxic and aerobic zones from the inside out. It has the advantages of high sludge concentration, good sedimentation performance, wide load tolerance range, low oxygen demand, low sludge production, good sedimentation performance, small footprint, simultaneous removal of organic matter, nitrogen, phosphorus and other pollutants, and high treatment effect. At present, the research and engineering application of aerobic granular sludge are mostly concentrated on SBR reactors, but SBR reactors are more suitable for small-scale wastewater treatment and are more complicated to operate and manage, which limits the promotion and application of this technology. Therefore, in recent years, it is very important to study a continuous flow aerobic granular sludge process that is stable, efficient, low in operating cost, easy to maintain and control. Summary of the invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a continuous flow aerobic granular sludge reaction device and process, which can realize the rapid cultivation of aerobic granular sludge and the stable, efficient and low-cost continuous operation of aerobic granular sludge technology by creating hydraulic conditions, and realize the simultaneous removal of organic matter, nitrogen and phosphorus pollutants in the wastewater treatment process, effectively solving the problems mentioned in the above background technology.

[0007] In order to solve the above problems, the technical solution adopted by the present invention is:

[0008] A continuous flow aerobic granular sludge reaction device comprises a biological selection zone, a microaerobic zone and an aerobic zone. A biological selection zone baffle is arranged between the biological selection zone and the microaerobic zone. The bottom of the biological selection zone baffle and the bottom of the continuous flow aerobic granular sludge reaction device form a water passage. The biological selection zone is connected with the microaerobic zone through the water passage. The microaerobic zone is connected with the aerobic zone. A cyclone aeration system is evenly arranged in the microaerobic zone to control the dissolved oxygen concentration in the microaerobic zone to be less than 0.5 mg / L. A microporous aeration system is evenly arranged in the aerobic zone. The dissolved oxygen concentration in the aerobic zone is within the range of 1.0-3.0 mg / L. Residual organic matter, N and P are removed synchronously. A plurality of aerobic granular sludge rapid granulation devices are installed above the aerobic zone. The upper end of the aerobic granular sludge rapid granulation device is higher than the water level of the aerobic zone.

[0009] Preferably, the continuous flow aerobic granular sludge reaction device has a square structure, and from left to right are the biological selection zone, the microaerobic zone and the aerobic zone. The upper opening of the aerobic granular sludge rapid device is square and the lower part is a V-shaped groove structure.

[0010] Preferably, the continuous flow aerobic granular sludge reaction device has a columnar structure, and from the outer layer to the inner layer are the biological selection zone, the microaerobic zone and the aerobic zone; the aerobic granular sludge rapid granulation device has an open columnar structure at the top and an inverted cone structure at the bottom.

[0011] Preferably, the aerobic granular sludge rapid granulation device is provided with a water inlet area, an air-water separation area, a sludge storage area and a drainage area.

[0012] Preferably, the water inlet zone is located on the upper outer wall of the aerobic granular sludge rapid granulation device, and its water inlet is formed by the opening of the outer wall. The height of the water inlet is slightly lower than the water level of the aerobic zone. Under the air lift effect formed by aeration, the wastewater enters the aerobic granular sludge rapid granulation device through the water inlet.

[0013] Preferably, the water inlet area is provided with a baffle, which is fixedly connected to the inner wall of the aerobic granular sludge rapid particle device, and the baffle is arranged on the inner side of the water inlet of the aerobic granular sludge rapid particle device. The bottom of the baffle does not contact the bottom end of the inside of the aerobic granular sludge rapid particle device, and an air-water separation zone is formed between the baffle and the water inlet, and air-water separation is achieved after the wastewater enters the air-water separation zone.

[0014] Preferably, when the sludge storage area is in the shape of a V-shaped groove, a perforated pipe and a sludge return pipe are provided at the bottom, the sludge return pipe is connected to the air stripping aeration pipe, one end of the sludge return pipe goes deep into the bottom of the V-shaped groove, and the other end extends out of the aerobic zone and the micro-aerobic zone to realize sludge return to the front biological selection zone;

[0015] When the sludge storage area is an inverted cone structure, a sludge return pipe is arranged at the bottom, the sludge return pipe is connected to the air lift aeration pipe, one end of the sludge return pipe goes deep into the bottom of the V-shaped groove, and the other end extends out of the aerobic zone and the micro-aerobic zone to realize sludge return to the front biological selection zone.

[0016] Preferably, the drainage area is located at the top of the aerobic granular sludge rapid granulation device, and the drainage area is provided with a drainage trough and a drainage pipe. The drainage trough is connected to the drainage pipe, and the drainage pipe extends out of the aerobic granular sludge reaction device to complete the discharge of effluent.

[0017] A continuous flow aerobic granular sludge reaction process comprises the following steps;

[0018] S1. After the wastewater enters the continuous flow aerobic granular sludge reaction device, it first passes through the biological selection zone, which is used to buffer the water quality, water volume and pH value of the influent. The microorganisms in the biological selection zone are in anoxic state, decomposing the polyphosphate in the body into inorganic phosphorus and releasing it into the wastewater;

[0019] S2, the wastewater from the biological selection area enters the micro-aerobic area through the water passage formed at the bottom of the baffle of the biological selection area. The micro-aerobic area adopts cyclone aeration to control the dissolved oxygen below 0.5 mg / L, effectively reducing the aeration energy consumption. Under low dissolved oxygen conditions, the autotrophic process of microorganisms is limited, and the limited oxygen is fully utilized to remove most of the COD and produce a small amount of sludge;

[0020] S3. The wastewater in the micro-aerobic zone enters the aerobic zone through the water passages on both sides or at the bottom of the aerobic granular sludge rapid granulation device. The wastewater in the aerobic zone does not need a lifting pump. Under the air lift effect formed by aeration, it enters the air-water separation zone of the aerobic granular sludge rapid granulation device through the water inlet of the water inlet zone to achieve air-water separation. Then, under the action of gravity, it slides down along the air-water separation zone into the sludge storage area;

[0021] S4. Perforated pipes and sludge return pipes are set in the sludge storage area. Under the action of air lift, the sludge is collected through the perforated pipes, and then returned to the micro-oxygen zone through the sludge return pipe, and the excess sludge is discharged;

[0022] S5. The sludge undergoes inertial spinning during the sliding process. Under the dual effects of the centripetal force generated during the spinning process and the flushing effect of the air lift in the sludge storage area, the mud and water are separated, and the flocculent sludge is self-agglomerated and quickly granulated;

[0023] S6. The sludge returned from the sludge storage area is further promoted to grow and enlarge under the hydraulic shear force of the cyclone formed during the cyclone aeration process in the micro-aerobic zone, and finally forms mature aerobic granular sludge through continuous circulation. The formed granular sludge has good settling performance, a dense layered structure, and good denitrification performance;

[0024] S7. After being treated, the wastewater in the aerobic granular sludge rapid granulation device is collected through the drainage trough on the top of the aerobic granular sludge rapid granulation device and then discharged through the drainage pipe.

[0025] The present invention has novel structure, ingenious design, simple and convenient operation, and has the following advantages compared with the prior art:

[0026] 1. A continuous flow aerobic granular sludge reaction device, which can realize the rapid cultivation of aerobic granular sludge and the stable, efficient and low-cost continuous operation of aerobic granular sludge technology.

[0027] 2. The structural design, water flow conditions and sludge airlift flushing effect of the aerobic granular sludge rapid granulation device are utilized to create hydraulic shear force to guide the sludge to self-agglomerate and quickly granulate. The swirl formed during the swirl aeration process in the micro-aerobic zone further creates hydraulic shear force, promoting the further growth and enlargement of small-size granular sludge, and circulating between the aerobic granular sludge rapid granulation device to form mature aerobic granular sludge, thereby achieving the simultaneous removal of organic matter, nitrogen and phosphorus pollutants.

[0028] 3. Air lift is used as the power for wastewater to enter the aerobic granular sludge rapid granulation device, sludge to return to the biological selection area, and sludge to be discharged. No pumping is required, which can effectively save power energy consumption.

[0029] 4. The cyclone aeration system is evenly arranged in the micro-oxygen zone of the reaction device to control the dissolved oxygen concentration in the micro-oxygen zone to less than 0.5 mg / L. The autotrophic process of microorganisms is limited under low dissolved oxygen conditions, and the limited oxygen is fully utilized to consume and remove most of the organic matter and reduce the amount of sludge produced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a three-dimensional schematic diagram of a square structure state of a continuous flow aerobic granular sludge reaction device of the present invention.

[0031] Figure 2 It is a front view of a square structure state of a continuous flow aerobic granular sludge reaction device of the present invention.

[0032] Figure 3 It is a front view of a square structure aerobic granular sludge rapid granulation device of a continuous flow aerobic granular sludge reaction device of the present invention.

[0033] Figure 4 It is a three-dimensional diagram of a square-structured aerobic granular sludge rapid granulation device of a continuous flow aerobic granular sludge reaction device of the present invention.

[0034] Figure 5 It is a three-dimensional diagram of the columnar structure state of a continuous flow aerobic granular sludge reaction device of the present invention.

[0035] Figure 6 It is a cross-sectional schematic diagram of the columnar structure state of a continuous flow aerobic granular sludge reaction device of the present invention.

[0036] Figure 7It is a front view of the columnar structure state of a continuous flow aerobic granular sludge reaction device of the present invention.

[0037] Figure 8 It is a three-dimensional diagram of a columnar aerobic granular sludge rapid granulation device of a continuous flow aerobic granular sludge reaction device of the present invention.

[0038] Fig. 9 This is a first schematic diagram of the internal structure of the outer cylinder of a continuous flow aerobic granular sludge reaction device of the present invention.

[0039] Fig.10 This is a second schematic diagram of the internal structure of the outer cylinder of a continuous flow aerobic granular sludge reaction device of the present invention.

[0040] In the figure: 1-aerobic granular sludge reaction device, 2-biological selection zone, 3-microaerobic zone, 4-aerobic zone, 5-biological selection zone baffle, 6-cyclone aeration system, 61-outer cylinder 61, 62-motor, 63-bottom plate, 64-liquid inlet, 65-impeller, 66-first cyclone wheel, 67-cylindrical frame, 68-rectangular opening, 69-bubble maker, 610-center rod, 611-spiral blade, 612-second cyclone Wheel, 613-top plate, 7-microporous aeration system, 8-aerobic granular sludge speed device, 81-square structure, 82-V-shaped groove, 83-water inlet area, 84-gas-water separation area, 85-sludge storage area, 86-drainage area, 87-baffle, 88-perforated pipe, 89-sludge return pipe, 810-air lift aeration pipe, 811-drainage trough, 812-drainage pipe, 813-cylindrical structure, 814-inverted cone structure. DETAILED DESCRIPTION

[0041] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0042] Embodiment 1

[0043] like Figure 1-Figure 4 As shown, the aerobic granular sludge reaction device 1 is a square structure, and from the left to the right are the biological selection zone 2, the microaerobic zone 3 and the aerobic zone 4.

[0044] The biological selection zone 2 is connected to the microaerobic zone 3 through a water passage below the biological selection zone baffle 5. The biological selection zone baffle 5 is fixedly connected to the inner wall of the aerobic granular sludge reaction device 1. The microaerobic zone 3 is connected to the aerobic zone 4.

[0045] The micro-oxygen zone 4 is evenly provided with a cyclone aeration system 6, which increases the dissolved oxygen content, promotes the mixing of sludge and water, enhances the efficiency of biochemical reactions, and reduces energy consumption and operating costs. The cyclone aeration system efficiently transfers oxygen from the air to the water body, thereby greatly increasing the dissolved oxygen content of the water body and controlling the dissolved oxygen concentration in the micro-oxygen zone to be less than 0.5 mg / L.

[0046] The aerobic zone 4 adopts a microporous aeration system 7, which generates a large number of micronized bubbles through tiny pores. These bubbles rise slowly in the water and are in full contact with the water body, thereby accelerating the diffusion rate of oxygen molecules in the water body and increasing the dissolved oxygen content of the water body. The dissolved oxygen concentration in the aerobic zone 4 is within the range of 1.0-3.0 mg / L, and the remaining organic matter, N, and P are removed simultaneously.

[0047] The upper sides of the cyclone aeration system 6 and the microporous aeration system 7 are connected to a gas aeration pipe 810, and the air inlet end of the gas aeration pipe 810 is connected to an aerator. The aerator is located on one side of the aerobic granular sludge reaction device 1, and gas is transported to the cyclone aeration system 6 and the microporous aeration system 7 through the gas aeration pipe 810;

[0048] The cyclone aeration system 6 includes an outer cylinder 61 of a cylindrical structure with openings at both ends, a bottom plate 63 is fixedly connected to the lower side of the inner part of the outer cylinder 61, a space is arranged on the lower side of the bottom plate 63 for fixing and connecting the motor 62 as a power source, a center rod 610 is axially arranged inside the outer cylinder 61 on the upper side of the bottom plate 63, the center rod 610 is rotatably connected to the middle part of the bottom plate 63 and the lower end of the center rod 610 is fixedly connected to the output end of the motor 62, and the center rod 610 is driven to rotate by the motor 62, and the surface of the center rod 610 is fixedly connected with an impeller 65, a first cyclone wheel 66, a spiral blade 611, a second cyclone wheel 613 and a top plate 614 in sequence from bottom to top, and a plurality of openings are opened on the surface of the top plate 614 and the top plate 614 is fixedly connected to the impeller 65, a first cyclone wheel 66, a spiral blade 611, a second cyclone wheel 613 and a top plate 614. The outer cylinder 61 is rotatably connected to the upper end thereof, a liquid inlet 64 is provided on the lower side of the surface of the outer cylinder 61, and the liquid inlet 64 is arranged corresponding to the impeller 65, a cylindrical frame 67 is coaxially arranged on the outer side of the spiral blade 611, the cylindrical frame 67 is fixedly connected to the inner wall of the outer cylinder 61, and a plurality of rectangular openings 68 are formed on the surface of the cylindrical frame 67, a rod-shaped bubble maker 69 with a tapered inner end is fixedly connected to the inner wall of the cylindrical frame 67 on both sides of the rectangular opening 68, and the central rod 610 can synchronously drive the impeller 65, the first swirl wheel 66, the spiral blade 611, the second swirl wheel 613 and the top plate 614 to rotate synchronously under the drive of the motor 62, a plurality of evenly distributed annular blades are provided on the circumferential surface of the impeller 65, and the impeller 65 will Sewage and sludge are sucked into the outer cylinder 61. The first cyclone and the second cyclone are respectively composed of a plurality of cylinders and push plates that are evenly fixedly connected to the circumferential surface of the cylinder in an annular shape. The push plates are respectively inclined downward with the radial direction of the cylinder as the axis. When the impeller 65, the first cyclone and the second cyclone rotate synchronously, the mixed sewage and sludge entering the outer cylinder 61 form a swirling motion inside the outer cylinder 61. When the gas enters the outer cylinder 61 through the air lift aeration pipe, the gas is discharged upward in a swirling manner under the rotation of the first cyclone wheel 66 and the second cyclone wheel 613. The gas is mixed with the sewage so that the sewage is fully in contact with the gas, and an upward flow is formed in the mixing process and discharged together. The impeller 65 is strengthened under the action of air lift. The spiral blade 611 has a serrated outer surface, and the spiral blade 611 can rotate synchronously with the central rod 610. When the spiral blade 611 rotates, it provides a driving force for the fluid to rise, increases the flow rate, and the gas and sewage are mixed and crushed by the bubble maker 69 during the rising process. When the spiral blade 611 rotates, the serrated outer surface can cooperate with the bubble maker 69 to bite the rising flow, thereby increasing the shear force, so that the airflow is further cut into tiny bubbles, increasing the contact area between the bubbles and the sewage, and improving the utilization rate of oxygen. The mixing of microorganisms and wastewater can be promoted during the oxygen migration process, and the hydraulic shear force formed in the micro-aerobic zone can be further increased through the spiral blade 611, which is conducive to the increase of the particle size of the aerobic granular sludge.

[0049] An aerobic granular sludge rapid particle device 8 is suspended and installed in the aerobic zone 4, and the upper end of the aerobic granular sludge rapid particle device 8 is higher than the water level of the aerobic zone to prevent the water level from overflowing into the aerobic zone and affecting the water discharge effect.

[0050] The aerobic granular sludge rapid granulation device 8 is a square structure 81 with an opening at the top and a V-shaped groove 82 at the bottom.

[0051] The aerobic granular sludge rapid granulation device 8 is provided with a water inlet area 83 , a gas-water separation area 84 , a sludge storage area 85 and a drainage area 86 .

[0052] The water inlet area 83 is located on the outer wall of the upper square structure of the aerobic granular sludge rapid particle device 8, and its water inlet is formed by the opening of the outer wall of the upper square structure 81 of the aerobic granular sludge rapid particle device 8. The height of the water inlet is slightly lower than the water level of the aerobic zone. Under the air lift effect formed by aeration, the wastewater enters the rapid particle device 8 through the water inlet.

[0053] The water inlet area 83 is provided with a baffle 87 parallel to the outer wall of the upper square structure. The baffle 87 is fixedly connected to the inner wall surface inside the water inlet of the aerobic granular sludge rapid particle device 8. A certain gap is left between the baffle 87 and the bottom end of the inside of the aerobic granular sludge rapid particle device 8, and a certain gap is left between the baffle 87 and the water inlet of the water inlet area 83, forming an air-water separation area 84. After the wastewater from the aerobic area enters the air-water separation area 84, the wastewater falls and the gas rises, thereby realizing air-water separation.

[0054] The sludge storage area 85 is in the shape of a V-shaped groove, and a perforated pipe 88 is provided at the bottom. The sludge enters the perforated pipe 88 through the holes on the surface of the perforated pipe 88. The perforated pipe 88 is fixedly connected to a sludge return pipe 89. One end of the sludge return pipe 89 connected to the perforated pipe 88 is inserted into the sludge. The sludge return pipe 89 is connected to the air lift aeration pipe 810. One end of the sludge return pipe 89 goes deep into the bottom of the V-shaped groove, and the other end extends from the aerobic zone 4 and the micro-aerobic zone 3 to the front biological selection zone 2. Gas is injected into the sludge return pipe 89 through the air lift aeration pipe 810. Since one end of the sludge return pipe 89 is blocked by sludge, the gas will flow to the outlet of the other end with relatively small pressure, and form an air lift effect under the rapid flow of gas. Under the action of air lift, the sludge at the other end of the sludge return pipe 89 is attracted to the biological selection zone along with the gas flow, and the sludge return is realized.

[0055] The drainage area 86 is located at the top of the aerobic granular sludge rapid device 8, and the drainage area 86 is provided with a drainage trough 811 and a drainage pipe 812. The drainage trough 811 is fixedly connected and connected to the drainage pipe 812. The drainage pipe 812 extends out of the aerobic granular sludge reaction device 1. Under the action of air lift, sewage continuously enters the water inlet, causing the water pressure at the water inlet to be greater than the pressure inside the aerobic granular sludge rapid device 8, and can rise to the upper side of the water inlet. Notches are opened on both sides of the surface of the drainage trough 811 along the length direction. The sewage enters the drainage trough 811 through the notch and is discharged through the drainage pipe 812 to complete the sewage discharge.

[0056] Embodiment 2

[0057] like Figure 5-Figure 8 As shown, the aerobic granular sludge reaction device 1 is a columnar structure, and from the outer layer to the inner layer are the biological selection zone 2, the microaerobic zone 3 and the aerobic zone 4.

[0058] The biological selection zone 2 is connected to the microaerobic zone 3 through a water passage below the biological selection zone baffle 5. The biological selection zone baffle 5 is fixedly connected to the inner wall of the aerobic granular sludge reaction device 1. The microaerobic zone 3 is connected to the aerobic zone 4.

[0059] The micro-oxygen zone 4 is evenly provided with a cyclone aeration system 6 to control the dissolved oxygen concentration in the micro-oxygen zone to be less than 0.5 mg / L.

[0060] The aerobic zone 4 adopts a microporous aeration system 7, and the dissolved oxygen concentration in the aerobic zone 4 is in the range of 1.0-3.0 mg / L, so that the remaining organic matter, N and P are removed simultaneously.

[0061] An aerobic granular sludge rapid particle device 8 is supported and installed in the aerobic zone 4, and the upper end of the rapid particle device 8 is higher than the water level of the aerobic zone to prevent the water level of the aerobic zone from overflowing and entering, thereby affecting the water discharge effect.

[0062] The sludge granulation device 8 is a columnar structure 813 with an opening at the top and an inverted cone structure 814 at the bottom.

[0063] The rapid particle device is provided with a water inlet area 83, a gas-water separation area 84, a sludge storage area 85 and a drainage area 86.

[0064] The water inlet zone 83 is located on the outer wall of the upper columnar structure of the aerobic granular sludge rapid particle device 8, and its water inlet is formed by the opening of the outer wall of the upper columnar structure 813 of the aerobic granular sludge rapid particle device 8. The height of the water inlet is slightly lower than the water level of the aerobic zone. Under the air lift effect formed by aeration, the wastewater enters the aerobic granular sludge rapid particle device 8 through the water inlet.

[0065] The water inlet area 83 is provided with a baffle 87 parallel to the outer wall of the upper cylindrical structure. The baffle 87 is fixedly connected to the inner wall surface inside the water inlet of the aerobic granular sludge rapid particle device 8. A certain gap is left between the baffle 87 and the bottom of the aerobic granular sludge rapid particle device 8, and a certain gap is left between the baffle 87 and the water inlet, forming an air-water separation area 84. After the wastewater from the aerobic area enters the air-water separation area 84, air-water separation is achieved.

[0066] The sludge storage area 85 is also an inverted cone structure, with two sludge return pipes 89 connected along the center point of the bottom of the inverted cone structure. The sludge return pipe 89 is fixedly connected to two air lift aeration pipes 810. One end of the sludge return pipe 89 extends deep into the bottom of the inverted cone structure, and the other end extends out of the aerobic zone 4 and the micro-aerobic zone 3 to the front biological selection zone 2 to realize sludge return.

[0067] The drainage area 86 is located at the top of the aerobic granular sludge rapid device 8, and the drainage area 86 is provided with a drainage trough 811 and a drainage pipe 812. The drainage trough 811 is fixedly connected and connected to the drainage pipe 812. The drainage pipe 812 extends out of the aerobic granular sludge reaction device 1. Under the action of air lift, sewage continuously enters the water inlet, causing the water pressure at the water inlet to be greater than the pressure inside the aerobic granular sludge rapid device 8, and can rise to the upper side of the water inlet. Notches are opened on both sides of the surface of the drainage trough 811 along the length direction. The sewage enters the drainage trough 811 through the notch and is discharged through the drainage pipe 812 to complete the sewage discharge.

[0068] When the device is used specifically, it is realized through the following process: after the wastewater enters the continuous flow aerobic granular sludge reaction device, it first passes through the biological selection zone, which is used to buffer the water quality, water volume and pH value of the influent. The microorganisms are in anoxic state in the biological selection zone, decomposing the polyphosphate in the body into inorganic phosphorus and releasing it into the wastewater; the wastewater in the biological selection zone enters the microaerobic zone through the water passage formed at the bottom of the baffle 5 of the biological selection zone. The microaerobic zone adopts cyclone aeration to control the dissolved oxygen below 0.5 mg / L, effectively reducing the aeration energy consumption. Under low dissolved oxygen conditions, the autotrophic process of microorganisms is limited, and the limited oxygen is fully utilized to remove most of the COD and produce a small amount of sludge; the wastewater in the microaerobic zone enters the aerobic zone through the water passage on both sides or at the bottom of the aerobic granular sludge device 8. The sewage in the aerobic zone does not need a lifting pump. Under the action of air lift formed by aeration, the sludge enters the air-water separation zone of the aerobic granular sludge rapid granulation device 8 through the water inlet of the water inlet zone to achieve air-water separation, and then slides down along the air-water separation zone under the action of gravity into the sludge storage area; the sludge storage area is provided with a perforated pipe and a sludge return pipe, and under the action of air lift, the sludge is collected through the perforated pipe, and then returns to the micro-aerobic zone through the sludge return pipe, and the excess sludge is discharged; the sludge performs inertial rotation during the sliding process, and under the dual effects of the centripetal force generated during the rotation process and the flushing effect of air lift in the sludge storage area, the mud and water are separated, and the flocculent sludge is guided to self-agglomerate and quickly granulate; the sludge returned from the sludge storage area, under the hydraulic shear force of the vortex formed during the vortex aeration process in the micro-aerobic zone, promotes the further growth and increase of small-size granular sludge, and finally continuously cycles to form mature aerobic granular sludge. The formed granular sludge has good settling performance, a dense layered structure and good denitrification performance; the wastewater in the aerobic granular sludge rapid granulation device is collected through the drainage trough on the top of the aerobic granular sludge rapid granulation device after being treated, and then discharged through the drainage pipe.

[0069] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A continuous flow aerobic granular sludge reaction device, comprising a biological selection zone (2), a microaerobic zone (3) and an aerobic zone (4), characterized in that: A biological selection zone baffle (5) is arranged between the biological selection zone (2) and the micro-aerobic zone. The bottom of the biological selection zone baffle (5) and the bottom of the continuous flow aerobic granular sludge reaction device (1) form a water passage. The biological selection zone (2) is connected to the micro-aerobic zone (3) through the water passage. The micro-aerobic zone (3) is connected to the aerobic zone (4). A cyclone aeration system (6) is evenly arranged in the micro-aerobic zone (3) to control the dissolved oxygen concentration in the micro-aerobic zone (3) to be less than 0.5 mg / L. A microporous aeration system (7) is evenly arranged in the aerobic zone (4). The dissolved oxygen concentration in the aerobic zone (4) is within the range of 1.0-3.0 mg / L. Residual organic matter, N and P are removed synchronously. A plurality of aerobic granular sludge granulation devices (8) are installed above the aerobic zone (4). The upper end of the aerobic granular sludge granulation device (8) is higher than the water level of the aerobic zone (4).

2. A continuous flow aerobic granular sludge reaction device as claimed in claim 1, characterized in that: The continuous flow aerobic granular sludge reaction device (1) is in a square structure (81), and comprises a biological selection zone (2), a microaerobic zone (3) and an aerobic zone (4) from left to right. The aerobic granular sludge rapid particle device (8) has a square upper opening and a V-shaped groove (82) structure at the bottom.

3. A continuous flow aerobic granular sludge reaction device as claimed in claim 1, characterized in that: The continuous flow aerobic granular sludge reaction device (1) is in a columnar structure (813), and comprises a biological selection zone (2), a microaerobic zone (3) and an aerobic zone (4) from the outer layer to the inner layer; the aerobic granular sludge rapid granulation device (8) is in a columnar structure (813) with an opening at the top and an inverted cone structure (814) at the bottom.

4. A continuous flow aerobic granular sludge reaction device as claimed in claim 2 or 3, characterized in that: The aerobic granular sludge rapid granulation device (8) is provided with a water inlet area (83), a gas-water separation area (84), a sludge storage area (85) and a drainage area (86).

5. A continuous flow aerobic granular sludge reaction device as claimed in claim 4, characterized in that: The water inlet area (83) is located on the upper outer wall of the aerobic granular sludge rapid granulation device (8), and its water inlet is formed by the opening of the outer wall. The height of the water inlet is slightly lower than the water level of the aerobic zone (4). Under the air lift effect formed by aeration, the wastewater enters the aerobic granular sludge rapid granulation device (8) through the water inlet.

6. A continuous flow aerobic granular sludge reaction device as claimed in claim 5, characterized in that: The water inlet area (83) is provided with a baffle (87), the baffle (87) is fixedly connected to the inner wall of the aerobic granular sludge rapid particle device (8), the baffle (87) is arranged on the inner side of the water inlet of the aerobic granular sludge rapid particle device (8), the bottom of the baffle (87) is not in contact with the inner bottom of the aerobic granular sludge rapid particle device (8), and an air-water separation area (84) is formed between the baffle (87) and the water inlet, and air-water separation is achieved after the wastewater enters the air-water separation area (84).

7. A continuous flow aerobic granular sludge reaction device as claimed in claim 6, characterized in that: When the sludge storage area (85) is in the shape of a V-shaped groove (82), a perforated pipe (88) and a sludge return pipe (89) are provided at the bottom, the sludge return pipe (89) is connected to the air lift aeration pipe (810), one end of the sludge return pipe (89) penetrates into the bottom of the V-shaped groove (82), and the other end extends out of the aerobic zone (4) and the micro-aerobic zone (3) to the front biological selection zone (2) to realize sludge return; When the sludge storage area (85) is an inverted cone structure (814), a sludge return pipe (89) is provided at the bottom, the sludge return pipe (89) is connected to the air lift aeration pipe (810), one end of the sludge return pipe (89) penetrates into the bottom of the V-shaped groove (82), and the other end extends out of the aerobic zone (4) and the micro-aerobic zone (3) to the front biological selection zone (2) to realize sludge return.

8. A continuous flow aerobic granular sludge reaction device as claimed in claim 7, characterized in that: The drainage area (86) is located at the top of the aerobic granular sludge reaction device (8). The drainage area (86) is provided with a drainage trough (811) and a drainage pipe (812). The drainage trough (811) is connected to the drainage pipe (812). The drainage pipe (812) extends out of the aerobic granular sludge reaction device (1) to complete the discharge of effluent.

9. A continuous flow aerobic granular sludge reaction process as claimed in claim 8, characterized in that: The steps include: S1. After the wastewater enters the continuous flow aerobic granular sludge reaction device (1), it first passes through the biological selection zone (2). The biological selection zone (2) is used to buffer the water quality, water volume and pH value of the influent. The microorganisms in the biological selection zone (2) are in anoxic state and decompose the polyphosphate in the body into inorganic phosphorus, which is released into the wastewater; S2, the wastewater from the biological selection zone (2) enters the micro-aerobic zone (3) through the water passage formed at the bottom of the biological selection zone baffle (5), and the micro-aerobic zone (3) adopts cyclonic aeration to control the dissolved oxygen below 0.5 mg / L, effectively reducing the aeration energy consumption. Under low dissolved oxygen conditions, the autotrophic process of microorganisms is limited, and the limited oxygen is fully utilized to remove most of the COD and produce a small amount of sludge; S3, the wastewater from the microaerobic zone (3) enters the aerobic zone (4) through the water passages on both sides or at the bottom of the aerobic granular sludge rapid granulation device (8). The wastewater from the aerobic zone (4) does not need a lifting pump. Under the air lift effect formed by aeration, it enters the air-water separation zone (84) of the aerobic granular sludge rapid granulation device (8) through the water inlet of the water inlet zone (83) to achieve air-water separation. Then, under the action of gravity, it slides down along the air-water separation zone (84) and enters the sludge storage zone (85); S4, the sludge storage area (85) is provided with a perforated pipe (88) and a sludge return pipe (89). Under the action of air lift, the sludge is collected through the perforated pipe (88), and then returned to the micro-aerobic area (3) through the sludge return pipe (89), and the excess sludge is discharged; S5, the sludge undergoes inertial rotation during the sliding process, and under the dual effects of the centripetal force generated during the rotation process and the flushing effect of the air lift in the sludge storage area (85), the mud and water are separated, and the flocculent sludge is self-agglomerated and quickly granulated; S6, the sludge returned from the sludge storage area (85), under the hydraulic shear force of the cyclone formed during the cyclone aeration process in the micro-aerobic zone (3), promotes the further growth of the small-size granular sludge, and finally continuously cycles to form mature aerobic granular sludge; The formed granular sludge has good settling performance, a dense layered structure, and good denitrification performance; S7. After being treated, the wastewater in the aerobic granular sludge rapid granulation device (8) is collected through the drainage trough (811) on the top of the aerobic granular sludge rapid granulation device (8), and then discharged through the drainage pipe (812).

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