A continuous flow aerobic granular sludge reactor and process

Abstract

This invention belongs to the field of wastewater treatment technology, specifically relating to a continuous flow aerobic granular sludge reactor and process. Addressing the problem that existing technologies struggle to meet high emission standards, this invention provides a continuous flow aerobic granular sludge reactor and process. The biological selection zone is connected to the microaerobic zone via a water passage, and the microaerobic and aerobic zones are interconnected. The microaerobic zone is uniformly equipped with a swirl aeration system, while the aerobic zone is uniformly equipped with a microporous aeration system. Multiple aerobic granular sludge rapid granulation devices are installed above the aerobic zone, enabling rapid cultivation of aerobic granular sludge and stable, efficient, and low-cost continuous operation of the aerobic granular sludge technology.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, specifically relating to a continuous flow aerobic granular sludge reactor and process. Background Technology

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

[0003] Micro-oxygen environment refers to a reaction system with dissolved oxygen concentration in the range of 0.3 mg / L to 1.0 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] Traditional aerobic activated sludge processes suffer from problems such as low biomass, poor resistance to shock loads, large sludge production, large footprint, long sludge retention time, poor sludge settling performance, and inability to simultaneously remove pollutants such as organic matter, nitrogen, and phosphorus, making it difficult to meet the requirements of high emission standards.

[0005] Aerobic granular sludge is a compact, regularly shaped bioaggregate formed by the self-aggregation of activated sludge microorganisms under specific hydraulic conditions. It possesses a dense, layered structure, forming anaerobic, anoxic, and aerobic zones from the inside out. It boasts advantages such as high sludge concentration, good settling performance, wide tolerance to loads, low oxygen demand, low sludge production, small footprint, and the ability to simultaneously remove organic matter, nitrogen, phosphorus, and other pollutants with high treatment efficiency. Currently, research and engineering applications of aerobic granular sludge largely focus on SBR reactors. However, SBR reactors are more suitable for small-scale wastewater treatment, and their operation and management are relatively complex, limiting the widespread adoption of this technology. Therefore, in recent years, research into stable, efficient, low-cost, and easy-to-maintain and controllable continuous-flow aerobic granular sludge processes has become crucial. Summary of the Invention

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

[0007] The technical solution adopted by the present invention to solve the above problems is as follows:

[0008] A continuous flow aerobic granular sludge reactor includes a biological selection zone, a microaerobic zone, and an aerobic zone. A biological selection zone baffle is provided between the biological selection zone and the microaerobic zone. The bottom of the biological selection zone baffle forms a water passage with the bottom of the continuous flow aerobic granular sludge reactor. The biological selection zone is connected to the microaerobic zone through the water passage. The microaerobic zone and the aerobic zone are interconnected. A swirl aeration system is uniformly distributed in the microaerobic zone to control the dissolved oxygen concentration in the microaerobic zone to <0.5 mg / L. A microporous aeration system is uniformly distributed in the aerobic zone, and the dissolved oxygen concentration in the aerobic zone is in the range of 1.0-3.0 mg / L, for the simultaneous removal of residual organic matter, N, and P. Multiple aerobic granular sludge rapid granulation devices are installed above the aerobic zone, with the upper end of the aerobic granular sludge rapid granulation devices higher than the water level in the aerobic zone.

[0009] The swirl aeration system includes an outer cylinder with openings at both the top and bottom. A base plate is fixedly connected to the lower side of the outer cylinder's interior. A space is provided on the lower side of the base plate for fixing a motor, the power source, to the system. A central rod is axially mounted inside the outer cylinder on the upper side of the base plate. The central rod is rotatably connected to the center of the base plate, and its lower end is fixedly connected to the motor's output end. Driven by the motor, the central rod rotates. From bottom to top, an impeller, a first swirl wheel, spiral blades, a second swirl wheel, and a top plate are sequentially fixedly connected to the surface of the central rod. The top plate has multiple openings... The top plate is rotatably connected to the upper end of the outer cylinder. An inlet is provided on the lower side of the outer cylinder surface, and the inlet is correspondingly set with the impeller. A cylindrical frame is coaxially set on the outer side of the spiral blade. The cylindrical frame is fixedly connected to the inner wall of the outer cylinder, and multiple rectangular openings are started on the surface of the cylindrical frame. A rod-shaped bubble maker with a conical inner end is fixedly connected to the inner wall of the cylindrical frame on both sides of the rectangular opening. The central rod can synchronously drive the impeller, the first vortex wheel, the spiral blade, the second vortex wheel and the top plate to rotate synchronously under the drive of the motor. Multiple uniformly distributed annular blades are opened on the circumferential surface of the impeller.

[0010] Preferably, the continuous flow aerobic granular sludge reactor has a square structure, with the biological selection zone, microaerobic zone and aerobic zone arranged sequentially from left to right. The upper opening of the aerobic granular sludge reactor is square, and the lower part is a V-shaped groove structure.

[0011] Preferably, the continuous flow aerobic granular sludge reactor has a cylindrical structure, with the outer layer being a biological selection zone, a microaerobic zone, and an aerobic zone, respectively, from the outermost layer to the innermost layer; the aerobic granular sludge reactor has an open cylindrical structure at the top and an inverted conical structure at the bottom.

[0012] Preferably, the aerobic granular sludge rapid granulation device is provided with an inlet water zone, an air-water separation zone, a sludge storage zone, and a drainage zone.

[0013] 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 an opening on the outer wall. The height of the water inlet is slightly lower than the water level in the aerobic zone. Under the air lift effect formed by aeration, the wastewater enters the interior of the aerobic granular sludge rapid granulation device through the water inlet.

[0014] Preferably, the inlet area is provided with a baffle, which is fixedly connected to the inner wall of the aerobic granular sludge rapid granulation device. The baffle is located inside the inlet of the aerobic granular sludge rapid granulation device, and the bottom of the baffle does not contact the bottom of the aerobic granular sludge rapid granulation device. An air-water separation zone is formed between the baffle and the inlet, and air-water separation is achieved after the wastewater enters the air-water separation zone.

[0015] Preferably, when the sludge storage area is V-shaped, a perforated pipe and a sludge return pipe are provided at the bottom. The sludge return pipe is connected to the airlift aeration pipe. One end of the sludge return pipe extends into the bottom of the V-shaped trough, and the other end extends into the aerobic zone and the microaerobic zone, reaching the front biological selection zone to realize sludge return.

[0016] When the sludge storage area has an inverted cone-shaped structure, a sludge return pipe is installed at the bottom. The sludge return pipe is connected to the airlift aeration pipe. One end of the sludge return pipe extends into the bottom of the V-shaped tank, and the other end extends into the aerobic zone and the microaerobic zone, reaching the front-end biological selection zone to realize sludge return.

[0017] Preferably, the drainage zone is located at the top of the aerobic granular sludge rapid granulation device. The drainage zone is equipped 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.

[0018] A continuous flow aerobic granular sludge reaction process includes the following steps;

[0019] S1. After the wastewater enters the continuous flow aerobic granular sludge reactor, it first passes through the biological selection zone. The biological selection zone is used to buffer the influent water quality, water quantity and pH value. The microorganisms are in an anaerobic state in the biological selection zone, and decompose the polyphosphate in their bodies into inorganic phosphorus and release it into the wastewater.

[0020] S2. The wastewater from the biological selection zone enters the micro-oxygen zone through the water passage formed at the bottom of the biological selection zone baffle. The micro-oxygen zone adopts swirl aeration to control dissolved oxygen below 0.5 mg / L, effectively reducing aeration energy consumption. Under low dissolved oxygen conditions, the autotrophic process of microorganisms is limited, making full use of limited oxygen to remove most of the COD and producing a small amount of sludge.

[0021] S3. Wastewater from 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 require a lift 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 zone.

[0022] S4. The sludge storage area is equipped with perforated pipes and sludge return pipes. Under the action of air lifting, the sludge is collected through the perforated pipes and then returned to the micro-aerobic zone through the sludge return pipes. Excess sludge is discharged.

[0023] S5. During the sliding process, the sludge undergoes inertial spin. Under the combined action of the centripetal force generated during the spin and the scouring effect of the air lift in the sludge storage area, the mud and water are separated, and the flocculent sludge self-aggregates and quickly forms granules.

[0024] S6. The sludge returned from the sludge storage area, under the hydraulic shear force of the swirling aeration process in the microaerobic zone, promotes the further growth and enlargement of small-diameter granular sludge particles, which are continuously circulated to form mature aerobic granular sludge. The resulting granular sludge has good settling performance, a dense layered structure, and good denitrification performance.

[0025] S7. Wastewater from the aerobic granular sludge rapid granulation unit is treated and collected through a drainage trough at the top of the unit, and then discharged through a drainage pipe.

[0026] This invention has a novel structure, ingenious concept, and simple and convenient operation, and has the following advantages compared with the prior art:

[0027] 1. A continuous flow aerobic granular sludge reactor, which enables rapid cultivation of aerobic granular sludge and stable, efficient, and low-cost continuous operation of aerobic granular sludge technology.

[0028] 2. By utilizing the structural design, water flow conditions, and sludge airlift and scouring effect of the aerobic granular sludge rapid granulation device, hydraulic shear force is created to guide the sludge to self-aggregate and rapidly form granules. The swirling flow formed during the swirling aeration process in the micro-aerobic zone further creates hydraulic shear force, promoting the further growth and enlargement of small-diameter granular sludge. This process is repeated between the sludge and the aerobic granular sludge rapid granulation device to form mature aerobic granular sludge, achieving the simultaneous removal of organic matter, nitrogen, and phosphorus pollutants.

[0029] 3. Air lifting is used as the power source for wastewater to enter the aerobic granular sludge rapid granulation device, sludge to return to the biological selection zone, and sludge discharge, eliminating the need for pumping and effectively saving energy consumption.

[0030] 4. The reaction device is equipped with a swirling aeration system in the micro-oxygen zone to control the dissolved oxygen concentration in the micro-oxygen zone to <0.5mg / L. Under low dissolved oxygen conditions, the autotrophic process of microorganisms is limited, making full use of the limited oxygen to consume and remove most of the organic matter and reduce the amount of sludge produced. Attached Figure Description

[0031] Figure 1 This is a three-dimensional schematic diagram of the square structure of a continuous flow aerobic granular sludge reactor according to the present invention.

[0032] Figure 2 This is a front view of the square structure of a continuous flow aerobic granular sludge reactor according to the present invention.

[0033] Figure 3 This is a front view of a square-structured aerobic granular sludge rapid particle device of a continuous flow aerobic granular sludge reactor according to the present invention.

[0034] Figure 4 This is a perspective view of a square-structured aerobic granular sludge rapid particle device of a continuous flow aerobic granular sludge reactor according to the present invention.

[0035] Figure 5 This is a perspective view of the cylindrical structure of a continuous flow aerobic granular sludge reactor according to the present invention.

[0036] Figure 6 This is a cross-sectional schematic diagram of the cylindrical structure of a continuous flow aerobic granular sludge reactor according to the present invention.

[0037] Figure 7 This is a front view of the cylindrical structure of a continuous flow aerobic granular sludge reactor according to the present invention.

[0038] Figure 8 This is a perspective view of a columnar structure aerobic granular sludge rapid particle device of a continuous flow aerobic granular sludge reactor according to the present invention.

[0039] Figure 9 This is a first schematic diagram of the internal structure of the outer cylinder of a continuous flow aerobic granular sludge reactor according to the present invention.

[0040] Figure 10This is a second schematic diagram of the internal structure of the outer cylinder of a continuous flow aerobic granular sludge reactor according to the present invention. In the diagram: 1-Aerobic granular sludge reactor, 2-Biological selection zone, 3-Microaerobic zone, 4-Aerobic zone, 5-Biological selection zone baffle, 6-Swirl aeration system, 61-Outer cylinder, 62-Motor, 63-Bottom plate, 64-Inlet, 65-Impeller, 66-First swirl wheel, 67-Cylindrical frame, 68-Rectangular opening, 69-Foamer, 610-Central rod, 611-Helical blade, 612-Second swirl wheel Wheel, 613-Top plate, 7-Microporous aeration system, 8-Aerobic granular sludge rapid particle device, 81-Square structure, 82-V-shaped trough, 83-Water inlet area, 84-Air-water separation area, 85-Sludge storage area, 86-Drainage area, 87-Baffle, 88-Perforated pipe, 89-Sludge return pipe, 810-Airlift aeration pipe, 811-Drainage trough, 812-Drainage pipe, 813-Cylindrical structure, 814-Inverted conical structure. Detailed Implementation

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

[0042] Example 1

[0043] like Figures 1-4 As shown, the aerobic granular sludge reactor 1 has a square structure, with the biological selection zone 2, microaerobic zone 3, and aerobic zone 4 arranged from left to right.

[0044] The biological selection zone 2 is connected to the micro-aerobic zone 3 through the 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 reactor 1. The micro-aerobic zone 3 and the aerobic zone 4 are connected.

[0045] The micro-aerobic zone 4 is uniformly equipped with a swirl aeration system 6. The swirl aeration system increases the dissolved oxygen content, promotes the mixing of sludge and water, enhances the efficiency of biochemical reaction, and reduces energy consumption and operating costs. By efficiently transferring oxygen from the air to the water, the dissolved oxygen content of the water is greatly increased, and the dissolved oxygen concentration in the micro-aerobic zone is controlled to be <0.5mg / L.

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

[0047] The upper sides of the swirl aeration system 6 and the microporous aeration system 7 are connected to the gas aeration pipe 810. The air inlet end of the gas aeration pipe 810 is connected to the aerator. The aerator is located on one side of the aerobic granular sludge reactor 1 and supplies gas to the swirl aeration system 6 and the microporous aeration system 7 through the gas aeration pipe 810.

[0048] The swirl aeration system 6 includes an outer cylinder 61 with openings at both the top and bottom. A base plate 63 is fixedly connected to the lower side of the inner cylinder 61. A space is provided on the lower side of the base plate 63 for fixing a motor 62, the power source, to the outer cylinder 61. A central rod 610 is axially arranged inside the outer cylinder 61 on the upper side of the base plate 63. The central rod 610 is rotatably connected to the middle of the base plate 63, and its lower end is fixedly connected to the output end of the motor 62. Driven by the motor 62, the central rod 610 rotates. From bottom to top, an impeller 65, a first swirl wheel 66, a spiral blade 611, a second swirl wheel 612, and a top plate 613 are sequentially fixedly connected to the surface of the central rod 610. The surface of the top plate 613 has multiple openings. Rotatably connected to the upper end of the outer cylinder 61, the outer cylinder 61 has a liquid inlet 64 on its lower surface, which is correspondingly positioned 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 the surface of the cylindrical frame 67 has multiple rectangular openings 68. A rod-shaped bubble maker 69 with a conical inner end is fixedly connected to the inner wall of the cylindrical frame 67 on both sides of the rectangular openings 68. The central rod 610 can synchronously drive the impeller 65, the first vortex wheel 66, the spiral blade 611, the second vortex wheel 612, and the top plate 613 to rotate synchronously under the drive of the motor 62. The circumferential surface of the impeller 65 has multiple evenly distributed annular blades. When the impeller 65 rotates, it will... Wastewater and sludge are drawn into the outer cylinder 61. The first and second hydrocyclones each consist of multiple cylindrical bodies and push plates uniformly and annularly fixed to the circumferential surface of the cylinders. The push plates are inclined downwards about the radial axis of the cylinder. When the impeller 65, the first hydrocyclone, and the second hydrocyclone rotate synchronously, the wastewater mixed with sludge entering the outer cylinder 61 forms a swirling motion inside the outer cylinder 61. When gas enters the outer cylinder 61 through the airlift aeration pipe, the rotation of the first hydrocyclone 66 and the second hydrocyclone 612 causes the gas to be discharged upwards in a swirling manner. The gas mixes with the wastewater, ensuring full contact between the wastewater and the gas. During the mixing process, an upward flow is formed and discharged together. Under the airlift action, the impeller 65 strengthens the... The suction effect of sewage and sludge; the outer surface of the spiral blades 611 is respectively opened with serrations. The spiral blades 611 can rotate synchronously with the central rod 610. When the spiral blades 611 rotate, they provide a driving force for the fluid to rise, increasing the flow rate. During the process of gas and sewage mixing and rising, they are crushed by the bubble maker 69. When the spiral blades 611 rotate, the outer serrations can cooperate with the bubble maker 69 to bite the rising flow, increase the shear force, and further cut the airflow into micro bubbles, increasing the contact area between the bubbles and sewage, improving the oxygen utilization rate. During the oxygen migration process, it can promote the mixing of microorganisms and wastewater, and further increase the hydraulic shear force formed in the micro-aerobic zone through the spiral blades 611, which helps to increase the particle size of aerobic granular sludge.

[0049] An aerobic granular sludge rapid granulation device 8 is suspended in the aerobic zone 4. The upper end of the aerobic granular sludge rapid granulation device 8 is higher than the water level in the aerobic zone to prevent the water level in the aerobic zone from rising and affecting the effluent 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 equipped with an inlet zone 83, an air-water separation zone 84, a sludge storage zone 85, and a drainage zone 86.

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

[0053] The inlet zone 83 is equipped with a baffle 87 parallel to the outer wall of the upper square structure. The baffle 87 is fixedly connected to the inner wall of the inlet of the aerobic granular sludge rapid granulation device 8. A certain gap is left between the baffle 87 and the bottom of the aerobic granular sludge rapid granulation device 8, and a certain gap is formed between the baffle 87 and the inlet of the inlet zone 83, thus forming a gas-liquid separation zone 84. After the wastewater from the aerobic zone enters the gas-liquid separation zone 84, the wastewater falls and the gas rises, thus achieving gas-liquid separation.

[0054] The sludge storage area 85 is V-shaped, with a perforated pipe 88 at the bottom. Sludge enters the perforated pipe 88 through the holes on its surface. A sludge return pipe 89 is fixedly connected to the perforated pipe 88. 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 an airlift aeration pipe 810. One end of the sludge return pipe 89 extends into the bottom of the V-shaped trough, and the other end extends from the aerobic zone 4 and the microaerobic zone 3 to the front biological selection zone 2. Gas is injected into the sludge return pipe 89 through the airlift aeration pipe 810. Because one end of the sludge return pipe 89 is blocked by sludge, the gas will flow to the outlet at the other end with relatively lower pressure. Under the rapid flow of gas, an airlift effect is formed. Under the airlift effect, the sludge at the other end of the sludge return pipe 89 is attracted to the biological selection zone along with the gas, thus realizing sludge return.

[0055] The drainage zone 86 is located at the top of the aerobic granular sludge rapid granulation device 8. The drainage zone 86 is equipped with a drainage trough 811 and a drainage pipe 812. The drainage trough 811 is fixedly connected to 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 lifting, sewage continuously enters the inlet, causing the water pressure at the inlet to be greater than the pressure inside the aerobic granular sludge rapid granulation device 8, so that it can rise to the upper side of the inlet. There are notches on both sides of the surface of the drainage trough 811 along the length direction. Sewage enters into the drainage trough 811 through the notches and is discharged through the drainage pipe 812, completing the sewage discharge.

[0056] Example 2

[0057] like Figures 5-8 As shown, the aerobic granular sludge reactor 1 has a cylindrical structure, with the outermost layer consisting of a biological selection zone 2, a microaerobic zone 3, and an aerobic zone 4, respectively.

[0058] The biological selection zone 2 is connected to the micro-aerobic zone 3 through the 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 reactor 1. The micro-aerobic zone 3 and the aerobic zone 4 are connected.

[0059] The micro-oxygen zone 4 is uniformly equipped with a swirl aeration system 6 to control the dissolved oxygen concentration in the micro-oxygen zone to <0.5mg / L.

[0060] The aerobic zone 4 uses 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 as to simultaneously remove residual organic matter, N and P.

[0061] An aerobic granular sludge rapid granulation device 8 is supported and installed in the aerobic zone 4. The upper end of the rapid granulation device 8 is higher than the water level in the aerobic zone to prevent the water level in the aerobic zone from rising and affecting the effluent effect.

[0062] The sludge granulation device 8 is a cylindrical structure 813 with an open top and an inverted conical structure 814 at the bottom.

[0063] The granulation device is equipped with a water inlet zone 83, a gas-water separation zone 84, a sludge storage zone 85, and a drainage zone 86.

[0064] The inlet zone 83 is located on the outer wall of the upper columnar structure of the aerobic granular sludge granulation device 8. Its inlet is formed by the opening on the outer wall of the upper columnar structure 813 of the aerobic granular sludge granulation device 8. The height of the 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 granulation device 8 through the inlet.

[0065] The inlet zone 83 is equipped with a baffle 87 parallel to the outer wall of the upper columnar structure. The baffle 87 is fixedly connected to the inner wall of the inlet of the aerobic granular sludge rapid granulation device 8. A certain gap is left between the baffle 87 and the bottom of the aerobic granular sludge rapid granulation device 8, and a certain gap is formed between the baffle 87 and the inlet, thus forming a gas-liquid separation zone 84. After the wastewater from the aerobic zone enters the gas-liquid separation zone 84, gas-liquid separation is achieved.

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

[0067] The drainage zone 86 is located at the top of the aerobic granular sludge rapid granulation device 8. The drainage zone 86 is equipped with a drainage trough 811 and a drainage pipe 812. The drainage trough 811 is fixedly connected to 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 lifting, sewage continuously enters the inlet, causing the water pressure at the inlet to be greater than the pressure inside the aerobic granular sludge rapid granulation device 8, so that it can rise to the upper side of the inlet. There are notches on both sides of the surface of the drainage trough 811 along the length direction. Sewage enters into the drainage trough 811 through the notches and is discharged through the drainage pipe 812, completing the sewage discharge.

[0068] In practical use, this device is implemented through the following process: After wastewater enters the continuous flow aerobic granular sludge reactor, it first passes through the biological selection zone. This zone buffers the influent water quality, quantity, and pH value. Microorganisms in the biological selection zone are in anoxic conditions, decomposing polyphosphates into inorganic phosphorus and releasing it into the wastewater. The wastewater from the biological selection zone enters the microaerobic zone through a water passage formed at the bottom of the baffle 5. The microaerobic zone uses swirling aeration to control dissolved oxygen below 0.5 mg / L, effectively reducing aeration energy consumption. Under low dissolved oxygen conditions, the autotrophic process of microorganisms is limited, fully utilizing the limited oxygen for most COD removal and producing a small amount of sludge. The wastewater from the microaerobic zone enters the aerobic zone through water passages on both sides or at the bottom of the aerobic granular sludge pelletizing device 8. The wastewater in the aerobic zone does not require a lift pump. Under the airlift effect of aeration, the sludge enters the air-water separation zone of the aerobic granular sludge rapid granulation device 8 through the inlet of the water inlet zone, achieving air-water separation. Then, under the action of gravity, it slides down along the air-water separation zone into the sludge storage zone. The sludge storage zone is equipped with perforated pipes and sludge return pipes. Under the airlift effect, the sludge is collected through the perforated pipes and then returned to the micro-aerobic zone through the sludge return pipes. Excess sludge is discharged. During the sliding process, the sludge undergoes inertial rotation. Under the combined action of the centripetal force generated during the rotation and the scouring effect of the airlift in the sludge storage zone, the sludge and water are separated, and the flocculent sludge self-aggregates rapidly into granules. The sludge returned from the sludge storage zone is further promoted to grow and increase in size under the hydraulic shear force of the swirling flow formed during the swirling aeration process in the micro-aerobic zone. Finally, the cycle continues and repeats, forming mature aerobic granular sludge. The resulting 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 treated and collected through the drainage trough at the top of the device, and then discharged through the drainage pipe.

[0069] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A continuous flow aerobic granular sludge reactor, 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 provided between the biological selection zone (2) and the micro-aerobic zone. The bottom of the biological selection zone baffle (5) forms a water passage with the bottom of the continuous flow aerobic granular sludge reactor (1). The biological selection zone (2) is connected to the micro-aerobic zone (3) through the water passage. The micro-aerobic zone (3) and the aerobic zone (4) are connected. A swirl 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 <0.5mg / L. A microporous aeration system (7) is evenly arranged in the aerobic zone (4) to keep the dissolved oxygen concentration in the aerobic zone (4) within the range of 1.0-3.0mg / L, so that the residual organic matter, N, and P are removed simultaneously. Multiple aerobic granular sludge rapid granulation devices (8) are installed above the aerobic zone (4). The upper end of the aerobic granular sludge rapid granulation device (8) is higher than the water level in the aerobic zone (4). The swirl aeration system (6) includes an outer cylinder (61) with a cylindrical structure open at both the top and bottom. A bottom plate (63) is fixedly connected to the lower side of the inner side of the outer cylinder (61). A space is provided on the lower side of the bottom plate (63) for fixing a motor (62) as the power source. A central rod (610) is axially arranged inside the outer cylinder (61) on the upper side of the bottom plate (63). The central rod (610) is rotatably connected to the middle of the bottom plate (63), and the lower end of the central rod (610) is fixedly connected to the output end of the motor (62). The central rod (610) is driven by the motor (62) to rotate. An impeller (65), a first swirl wheel (66), a spiral blade (611), a second swirl wheel (612), and a top plate (613) are fixedly connected from bottom to top on the surface of the central rod (610). The surface of the top plate (613) has multiple openings and the top... The plate (613) is rotatably connected to the upper end of the outer cylinder (61). The lower side of the surface of the outer cylinder (61) is provided with a liquid inlet (64) and the liquid inlet (64) is correspondingly set with the impeller (65). A cylindrical frame (67) is coaxially set 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 the surface of the cylindrical frame (67) has multiple rectangular openings (68). A rod-shaped bubble maker (69) with a conical inner end is fixedly connected to the inner wall of the cylindrical frame (67) on both sides of the rectangular opening (68). The central rod (610) can synchronously drive the impeller (65), the first vortex wheel (66), the spiral blade (611), the second vortex wheel (612) and the top plate (613) to rotate synchronously under the drive of the motor (62). Multiple uniformly distributed blades are provided on the circumferential surface of the impeller (65).

2. The continuous flow aerobic granular sludge reactor as described in claim 1, characterized in that: The continuous flow aerobic granular sludge reactor (1) has a square structure (81), and from left to right, it consists of a biological selection zone (2), a micro-aerobic zone (3), and an aerobic zone (4). The aerobic granular sludge rapid particle device (8) has a square opening at the top and a V-shaped groove (82) at the bottom.

3. The continuous flow aerobic granular sludge reactor as described in claim 1, characterized in that: The continuous flow aerobic granular sludge reactor (1) has a columnar structure (813), with the outer layer being the biological selection zone (2), the micro-aerobic zone (3), and the aerobic zone (4) in sequence from the inner layer; the aerobic granular sludge rapid particle device (8) has an open columnar structure (813) at the top and an inverted conical structure (814) at the bottom.

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

5. The continuous flow aerobic granular sludge reactor as described in claim 4, characterized in that: The inlet zone (83) is located on the upper outer wall of the aerobic granular sludge rapid granulation device (8). Its inlet is formed by opening the outer wall. The height of the 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 interior of the aerobic granular sludge rapid granulation device (8) through the inlet.

6. The continuous flow aerobic granular sludge reactor as described in claim 5, characterized in that: The inlet zone (83) is equipped with a baffle (87), which is fixedly connected to the inner wall of the aerobic granular sludge granulation device (8). The baffle (87) is located inside the inlet of the aerobic granular sludge granulation device (8). The bottom of the baffle (87) does not contact the bottom of the aerobic granular sludge granulation device (8). A gas-water separation zone (84) is formed between the baffle (87) and the inlet. After the wastewater enters the gas-water separation zone (84), gas-water separation is achieved.

7. The continuous flow aerobic granular sludge reactor as described in claim 6, characterized in that: When the sludge storage area (85) is in the shape of a V-shaped trough (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) extends into the bottom of the V-shaped trough (82), and the other end extends out of the aerobic zone (4) and the microaerobic zone (3) to the front biological selection zone (2) to realize sludge return. When the sludge storage area (85) is an inverted cone-shaped structure (814), a sludge return pipe (89) is set 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) extends into the bottom of the V-shaped trough (82), and the other end extends out of the aerobic zone (4) and the microaerobic zone (3) to the front biological selection zone (2) to realize sludge return.

8. The continuous flow aerobic granular sludge reactor as described in claim 7, characterized in that: The drainage zone (86) is located at the top of the aerobic granular sludge rapid particle device (8). The drainage zone (86) is equipped 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 water.

9. The reaction process of a continuous flow aerobic granular sludge reactor as described in claim 8, characterized in that: Includes the following steps; S1. After the wastewater enters the continuous flow aerobic granular sludge reactor (1), it first passes through the biological selection zone (2). The biological selection zone (2) is used to buffer the influent water quality, water quantity and pH value. Microorganisms are in an anaerobic state in the biological selection zone (2), decompose the polyphosphate in their bodies into inorganic phosphorus and release it into the wastewater. S2. Wastewater from the biological selection zone (2) enters the micro-oxygen zone (3) through the water passage formed at the bottom of the biological selection zone baffle (5). The micro-oxygen zone (3) adopts swirl aeration to control dissolved oxygen below 0.5 mg / L, effectively reducing aeration energy consumption. Under low dissolved oxygen conditions, the autotrophic process of microorganisms is limited, making full use of limited oxygen to remove most of the COD and producing a small amount of sludge. S3. Wastewater from the micro-aerobic zone (3) enters the aerobic zone (4) through the water passages on both sides or at the bottom of the aerobic granular sludge rapid particle device (8). The wastewater in the aerobic zone (4) does not require a lift pump. Under the air lift effect formed by aeration, it enters the air-water separation zone (84) of the aerobic granular sludge rapid particle device (83) through the 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) into the sludge storage zone (85). S4. The sludge storage area (85) is equipped with a perforated pipe (88) and a sludge return pipe (89). Under the action of air lifting, the sludge is collected through the perforated pipe (88) and then returned to the micro-aerobic area (3) through the sludge return pipe (89). Excess sludge is discharged. S5. During the sliding process, the sludge undergoes inertial spin. Under the combined action of the centripetal force generated during the spin and the scouring effect of the air lift in the sludge storage area (85), the mud and water are separated, and the flocculent sludge self-aggregates and quickly forms granules. S6, the sludge returned from the sludge storage area (85) and the hydraulic shear force of the swirling aeration process formed in the micro-aerobic zone (3) promotes the further growth and enlargement of small-diameter granular sludge, which eventually circulates repeatedly to form mature aerobic granular sludge. The resulting granular sludge has good settling performance, a dense layered structure, and good denitrification performance; S7, the wastewater in the aerobic granular sludge rapid granulation device (8) is treated and then collected through the drainage trough (811) at the top of the aerobic granular sludge rapid granulation device (8), and then discharged through the drainage pipe (812).

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