Aerobic granular sludge batch treatment reactor

Abstract

According to the aerobic granular sludge batch treatment reactor provided by the invention, full mixing and mass transfer of sludge and sewage are realized by utilizing the shear stress generator, meanwhile, the shear stress generator can optimize the structure of aerobic granular sludge, and effective control on the structure of the aerobic granular sludge is realized in combination with the selective pressure generation device; the flow guide cone is arranged, the water flow speed between the flow guide cone and the shear stress generator is increased, accumulation of the aerobic granular sludge is prevented, the aerobic granular sludge shear stress generator is more flexible in arrangement, the gas-water ratio is more flexible in selection, a sludge system is easier to control, and a stable operation environment of the aerobic granular sludge is realized. The device is simple in structure, adopts modularized and device design, can be automatically controlled, and ensures the stable operation of an aerobic granular sludge system.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial wastewater treatment, in particular to an aerobic granular sludge batch treatment reactor. Background Art

[0002] Aerobic granular sludge is a granular aggregate formed by self-agglomeration of microorganisms. Compared with the traditional activated sludge method, the aerobic granular sludge method for treating sewage has the advantages of short process, high load, multiple functions, impact resistance, fast sedimentation rate, small sludge production, energy saving and land saving; multiple strains work together to bring together aerobic, anoxic and anaerobic microorganisms, and is particularly suitable for the treatment of high-concentration and high-total nitrogen wastewater in petrochemicals; the formation and control of granular sludge in aerobic granular sludge reactors requires the selection of aerobic sludge particles, that is, it is necessary to remove inferior granular sludge and granular sludge fragments during the startup and operation of the system to ensure the existence of dominant strains in the aerobic granular sludge system. This change is particularly difficult in batch reactors, and it is difficult to ensure the continuous and efficient operation of aerobic granular sludge reactors.

[0003] CN202210072286.9 discloses a method for adjusting the sedimentation performance of aerobic granular microbial aggregates. The patent sets an ascending zone, a descending zone, and a solid-liquid separation zone in the device. The ascending zone uses the shear force of the water flow to form an aerobic granular microbial aggregate; the high-density aerobic particles in the descending zone sink to the bottom for cyclic reaction, and the low-density aerobic particles float up with the water flow into the solid-liquid separator for solid-liquid separation. The low-density sludge is screened by adding a mixed powder. This patent uses the different sedimentation performances of aerobic particles of different densities to screen them. It is a method to improve the aerobic granular sludge system of the reactor. However, as the reaction proceeds, the aerobic granular sludge becomes larger, a cavity is formed inside, and some even become fragments. The low-density aerobic granular sludge is improved by adding a mixed powder to improve the sedimentation performance, and then returns to the aerobic granular sludge system. It is still difficult to ensure the continuous and efficient operation of the aerobic granular sludge reactor. This is because these low-density aerobic granular sludges have aged and their biochemical performance has decreased. They do not help to improve the performance of the aerobic granular sludge system and will still cause the collapse of the aerobic granular sludge system as the reaction proceeds.

[0004] CN202211598204.0 discloses a coupled aerobic granular sludge batch treatment reactor, which utilizes a shear stress generator to achieve sufficient mixing and mass transfer of sludge and sewage. At the same time, the shear stress generator can optimize the structure of aerobic granular sludge, and combined with a selective pressure generating device, effective control of the structure of aerobic granular sludge can be achieved. In this patent, aerobic granular sludge forms a circulating flow driven by sewage. Due to the low annular gap ratio of the reactor design, the water flow velocity will decrease at the bottom of the reactor and around the shear stress generator, and sometimes it may even be lower than 1.0m / s, resulting in sludge accumulation in some areas with low water flow velocity at the bottom of the reactor, affecting the quality of sludge particles in the aerobic granular sludge system, thereby affecting the treatment effect of the reactor. Utility Model Content

[0005] The utility model provides an aerobic granular sludge batch treatment reactor to solve the above-mentioned deficiencies in the prior art.

[0006] The technical solution adopted by the utility model is: an aerobic granular sludge batch treatment reactor, comprising an air inlet duct, a water inlet duct, a reactor shell, a shear stress generator, a selective pressure generating device and a guide cone; the water inlet duct, the air inlet duct and the selective pressure generating device are respectively connected to the outside of the reactor shell; the guide cone and the shear stress generator are respectively arranged on the inside of the reactor shell.

[0007] Preferably, the guide cone includes an edge guide cone and an internal guide cone; the edge guide cone is arranged at the periphery of the inner side of the bottom of the reactor shell, and is used to increase the water flow velocity between the reactor shell and the shear stress generator to prevent the accumulation of aerobic granular sludge; the internal guide cone is arranged between different shear stress generators at the bottom of the reactor, and is used to increase the water flow velocity between more than two shear stress generators to prevent the accumulation of aerobic granular sludge.

[0008] Preferably, the shear stress generator includes an aerator, a jet water inlet and a guide pipe; the jet water inlet and the aerator are arranged below the guide pipe, and an annular hole is provided on the guide pipe; the jet water inlet is connected to the water inlet pipe, and the aerator is connected to the air inlet pipe; the aerator provides a reasonable air source for the shear stress generator, drives the water flow to rise inside the guide pipe, and shears the aerobic granular sludge; the jet water inlet provides rapid mixing for the sewage in the reactor during the water inlet stage of the batch reactor, so that the microorganisms inside and outside the aerobic granular sludge can absorb sufficient nutrients, that is, the microorganisms are well fed; the shear stress generator is a key component of the aerobic granular sludge batch reactor. During the operation stage of the batch reactor, while ensuring the gas-water ratio of the sewage treatment, it provides the aerobic granular sludge batch reactor with suitable hydraulic shear stress, so that the aerobic granular sludge becomes dense, and at the same time removes some inferior bacteria on the aerobic granular sludge particles, thereby improving the sedimentation performance of the aerobic granular sludge.

[0009] Preferably, the selective pressure generating device includes a group of pipes with valves and drainage pipes, each pipe with valves is connected to the reactor shell on one side and to the drainage pipe on the other side; each pipe with valves is arranged in layers in the vertical direction. Aerobic particles of different densities have different sinking properties. High-density, high-quality aerobic particles without cavities sink faster, while low-density, low-quality aerobic particles with cavities sink slower; therefore, at the same time, high-quality aerobic particles are in a relatively lower position in the reactor, while low-quality aerobic particles are in a relatively upper position in the reactor; according to the operation needs of the aerobic granular sludge system, the selective pressure generating device can be used to drain water at different depths and different start-up times during the sedimentation stage of the batch reactor to provide a suitable selective pressure for the aerobic granular sludge batch reactor, remove the inferior sludge particles and sludge fragments in the sewage, and achieve the purpose of selecting the best and eliminating the worst.

[0010] Preferably, the height of the connection between the pipeline with the valve and the reactor shell is consistent with the height of the annular hole opened on the guide pipe.

[0011] Preferably, more than two shear stress generators may be evenly arranged in the reactor shell according to the scale of the reactor.

[0012] Beneficial Effects

[0013] (1) The shear stress generator is used to achieve full mixing and mass transfer of sludge and sewage. At the same time, the shear stress generator can optimize the structure of aerobic granular sludge and combine with the selective pressure generating device to achieve effective control of the structure of aerobic granular sludge.

[0014] (2) By using a selective pressure generating device, during the sedimentation stage of the batch reactor, different selective pressures are provided by draining water at different depths and different start-up times, so that aerobic granular sludge that meets the requirements is retained for recycling, and inferior sludge particles and sludge fragments that do not meet the requirements are discharged with the sewage, making the process operation flexible.

[0015] (3) By setting a guide cone, the water flow velocity between the guide cone and the shear stress generator is increased to prevent the accumulation of aerobic granular sludge, making the layout of the aerobic granular sludge shear stress generator more flexible, the selection of the gas-water ratio more flexible, and the sludge system easier to control, thereby achieving a stable operating environment for aerobic granular sludge.

[0016] (4) The utility model has a simple structure, adopts a modular and device-based design, and can be automatically controlled to ensure the stable operation of the aerobic granular sludge system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the utility model;

[0018] Figure 2This is a schematic diagram of the arrangement of guide cones when 4 sets of shear stress generators are provided in the utility model;

[0019] Figure 3 It is a schematic elevation view of the edge guide cone of the utility model;

[0020] Figure 4 It is a schematic elevation view of the internal guide cone of the utility model;

[0021] In the figure: 1. air inlet duct; 2. water inlet duct; 3. reactor shell; 4. guide pipe; 5. pipe with valve; 6. drainage pipe; 7. annular hole; 8. aerator; 9. jet water inlet; 10. edge guide cone; 11. internal guide cone. DETAILED DESCRIPTION

[0022] like Figure 1-4 As shown: an aerobic granular sludge batch treatment reactor is provided with two shear stress generators, including an air inlet pipe 1, a water inlet pipe 2, a reactor shell 3, a guide pipe 4, a valve pipe 5, a drainage pipe 6, an annular hole 7, an aerator 8, a jet water inlet 9, an edge guide cone 10, and an internal guide cone 11. The reactor shell 3 provides space for sewage treatment; the water inlet pipe 2 transports sewage to the reactor, and the water inlet pipe 2 is connected to the jet water inlet 9; the air inlet pipe 1 is connected to the aerator 8, and air with a certain pressure is transported to the reactor, which provides power for the water flow movement in the reactor on the one hand, and oxygenates the reactor on the other hand; the jet water inlet 9 and the aerator 8 are arranged below the guide pipe 4, and an annular hole 7 is provided on the guide pipe 4. Four valved pipes 5 are connected to the reactor shell on one side and to the drainage pipe 6 on the other side; each valved pipe 5 is arranged in layers in the vertical direction, and the height of the connection between the valved pipe 5 and the reactor shell 3 is consistent with the height of the annular hole 7 provided on the guide pipe 4. The edge guide cone 10 is arranged at the periphery of the inner side of the bottom of the reactor shell 3, and is used to increase the water flow velocity between the reactor shell 3 and the shear stress generator to prevent the accumulation of aerobic granular sludge; the internal guide cone 11 is arranged between the two shear stress generators at the bottom of the reactor, and is used to increase the water flow velocity between the two shear stress generators to prevent the accumulation of aerobic granular sludge.

[0023] Under the action of the jet water inlet 9 and the aerator 8, the water flow rises in the guide tube 4, driving the granular sludge in the reactor to move, and the water flow carrying the sludge flows out from the top of the guide tube and then sinks and settles around the guide tube; aerobic particles of different densities have different sinking properties, high-density, high-quality aerobic particles without cavities sink faster, and low-density, low-quality aerobic particles with cavities sink slower; therefore, at the same time, the high-quality aerobic particles are in a relatively lower position in the reactor, while the low-quality aerobic particles are in a relatively upper position in the reactor; at this time, through the selective pressure generating device, water is discharged at different depths and different start-up times during the sedimentation stage of the batch reactor, and a suitable selective pressure is provided for the aerobic granular sludge batch reactor while ensuring that the water level of the reactor drops at a certain rate, so as to remove the low-quality sludge particles and sludge fragments in the sewage and achieve the purpose of selecting the best and eliminating the worst. When the reactor is drained quickly, the water in the guide pipe 4 must also be drained quickly, but it must not cause the sludge at the bottom to float up. It is necessary to open an annular hole 7 on the guide pipe 4 to ensure the rapid discharge of water; the discharged sewage is discharged through the drainage pipe 6 and enters the next level of treatment facilities or is discharged.

Claims

1. An aerobic granular sludge batch treatment reactor, characterized in that: It includes an air inlet duct, a water inlet duct, a reactor shell, a shear stress generator, a selective pressure generating device and a guide cone; the water inlet duct, the air inlet duct and the selective pressure generating device are respectively connected to the outside of the reactor shell, and the guide cone and the shear stress generator are respectively arranged on the inside of the reactor shell; the shear stress generator includes an aerator, a jet water inlet and a guide pipe; the jet water inlet and the aerator are arranged below the guide pipe, and an annular hole is provided on the guide pipe; the jet water inlet is connected to the water inlet duct, and the aerator is connected to the air inlet duct; the selective pressure generating device includes a group of pipes with valves and drainage pipes, each of which is connected to the reactor shell on one side and to the drainage pipe on the other side; each of the pipes with valves is arranged in layers in the vertical direction.

2. The aerobic granular sludge batch treatment reactor according to claim 1, characterized in that: The height of the connection between the pipeline with the valve and the reactor shell is consistent with the height of the annular hole opened on the guide pipe.

3. The aerobic granular sludge batch treatment reactor according to claim 1, characterized in that: Two or more shear stress generators are evenly arranged in the reactor shell according to the scale of the reactor.

4. The aerobic granular sludge batch treatment reactor according to claim 3, characterized in that: The guide cone comprises an edge guide cone and an internal guide cone; the edge guide cone is arranged at the periphery of the inner side of the bottom of the reactor shell; and the internal guide cone is arranged between different shear stress generators at the bottom of the reactor.

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