CN216403957U - Multistage self-circulation aerobic granular sludge treatment device - Google Patents

Abstract

The utility model relates to the technical field of sewage treatment devices, and provides a multistage self-circulation aerobic granular sludge treatment device, which comprises: the main body is provided with an inlet and an outlet, an anoxic zone and an aerobic zone are arranged in the main body, and a sludge filtering zone is arranged above the aerobic zone; the water body accelerating device is connected with the inlet, and at least one part of the inner diameter of the water body accelerating device is reduced along the flowing direction of the water body; the central cylinder is arranged in the main body, an anoxic zone is formed in the area in the central cylinder, and an aerobic zone is formed in the area between the outer wall of the central cylinder and the inner wall of the main body; the water inlet end of the central cylinder is arranged corresponding to the water outlet end of the water body accelerating device, and the end of the central cylinder corresponding to the water body accelerating device is provided with a first gap and a second gap; and the aeration device is arranged in the aerobic zone and is suitable for providing oxygen for microorganisms in the aerobic zone. The device utilizes the kinetic energy of water self to stir the water in the main part, need not to set up dive formula agitating unit, can reduce the consumption of the energy, is favorable to green.

Description

Multistage self-circulation aerobic granular sludge treatment device

Technical Field

The utility model relates to the technical field of sewage treatment devices, in particular to a multistage self-circulation aerobic granular sludge treatment device.

Background

The internal process of the existing biochemical water treatment equipment is an A2/O process (also called anoxic-aerobic process) or an A/O process (also called anoxic-aerobic process), and the two processes both need to be stirred in an anoxic section to generate good denitrification reaction.

In the prior art, in order to fully stir the water body in the anoxic section, a submersible stirring device is usually adopted, but the submersible stirring device needs extra power consumption, and particularly needs more submersible stirring devices to uniformly stir the water body and meet the stirring effect, so that the submersible stirring device has higher energy consumption and is not beneficial to environmental protection; the other method is micro-gas aeration stirring, which has low power consumption, but because aeration is needed in an anoxic section, the dissolved oxygen content of the section is not well controlled, and the denitrification effect is influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is that when the biochemical water treatment equipment in the prior art stirs water, the energy consumption is high, and the stirring effect is poor, so that the multistage self-circulation aerobic granular sludge treatment device is provided.

The utility model provides a multistage self-circulation aerobic granular sludge treatment device, which comprises: the main body is provided with an inlet and an outlet, an anoxic zone and an aerobic zone are arranged in the main body, and a sludge filtering zone is arranged above the aerobic zone; the water body accelerating device is connected with the inlet, and at least one part of the inner diameter of the water body accelerating device is reduced along the flowing direction of the water body; the central cylinder is arranged in the main body, the anoxic zone is formed in the area in the central cylinder, and the aerobic zone is formed in the area between the outer wall of the central cylinder and the inner wall of the main body; the water inlet end of the central cylinder is arranged corresponding to the water outlet end of the water body accelerating device, and a first gap and a second gap are arranged at one end of the central cylinder corresponding to the water body accelerating device; one part of water in the anoxic zone flows back to the water accelerating device through the first gap, and the other part of water in the anoxic zone flows to the aerobic zone through the second gap; the aeration device is arranged in the aerobic zone and comprises a plurality of aeration pipes, a plurality of aeration heads are arranged at the air outlet ends of the aeration pipes, and the air inlet ends of the aeration pipes are communicated with an external air source and are suitable for providing oxygen for microorganisms in the aerobic zone; the water inlet end of the mud filtering area is communicated with the aerobic area, and the water outlet end of the aerobic area is communicated with the outlet.

Further, the water body accelerating device comprises: a water ejector; the water ejector is communicated with the inlet, and at least one part of the water ejector is arranged in a conical shape along the flowing direction of the water body; the central cylinder cover is buckled above the water ejector, and the second gap is formed between the central cylinder and the water ejector.

Further, the water body acceleration device also comprises at least one acceleration spray pipe, and the cover is buckled above the water ejector; at least one part of the accelerating jet pipe is arranged in a conical shape along the flowing direction of the water body; the central cylinder cover is buckled above the accelerating spray pipe, and the second gap is formed between the central cylinder and the accelerating spray pipe.

Further, the multistage self-circulation aerobic granular sludge treatment device also comprises a central ascending pipe, the central ascending pipe is positioned inside the central cylinder and is positioned in front of a water body flow path in the central cylinder, and the anoxic zone is formed in a region between the central ascending pipe and the central cylinder; at least a portion of the central riser pipe is conically configured; the first gap is formed between the central ascending pipe and the central cylinder; the water inlet end of the central ascending pipe is arranged corresponding to the water outlet end of the accelerating spray pipe.

Furthermore, a water through hole is formed in the water outlet end of the central ascending pipe, and the water through hole is formed along the circumferential direction of the central ascending pipe.

Furthermore, the anoxic zone is connected with the aerobic zone through an inverted V-shaped water body channel.

Furthermore, an air lifting channel is arranged in the aerobic zone, and the inner diameter of the air lifting channel gradually decreases along the flowing direction of the water body.

Further, the air lifting channel is attached to the outer wall of the central cylinder or attached to the inner wall of the main body.

Furthermore, a transition flow guide channel is arranged in the aerobic zone, one end of the transition flow guide channel is connected with the gas stripping ascending channel, and the other end of the transition flow guide channel is communicated with the water inlet end of the mud filtering zone.

Furthermore, a sludge supporting bucket is arranged between the transition flow guide channel and the water inlet end of the mud filtering area, so that the concentration of a mud filtering layer in the mud filtering area is kept dynamically stable.

Furthermore, a first sludge backflow channel is arranged in the aerobic zone, one end of the first sludge backflow channel is communicated with the transition flow guide channel, and the other end of the first sludge backflow channel is communicated with a water body channel between the anoxic zone and the aerobic zone.

Furthermore, a second sludge backflow channel is arranged in the aerobic zone, one end of the second sludge backflow channel is communicated with the sludge filtering zone, and the other end of the second sludge backflow channel is communicated with the water body accelerating device.

Further, a screening plate is arranged at the inlet end of the second sludge return channel; the screening plate comprises a plurality of plate bodies arranged in parallel at intervals, and gaps between every two adjacent plate bodies are suitable for water bodies to pass through.

Further, the multistage self-circulation aerobic granular sludge treatment device also comprises a water outlet weir groove which is arranged along the circumferential direction of the inner wall of the main body; the water outlet weir groove is positioned above the mud filtering area, the water inlet end of the water outlet weir groove is communicated with the water outlet end of the mud filtering area, and the water outlet end of the water outlet weir groove is communicated with the outlet.

Furthermore, the multistage self-circulation aerobic granular sludge treatment device further comprises a sludge discharge pipe, wherein the inlet end of the sludge discharge pipe is communicated with the bottom of the main body, the outlet end of the sludge discharge pipe extends out of the main body, and the outlet end of the sludge discharge pipe is suitable for being connected with sludge storage equipment.

Further, the multistage self-circulation aerobic granular sludge treatment device also comprises an exhaust valve which is arranged at the top of the main body and is suitable for exhausting gas in the anoxic zone.

Further, the main body is of a straight cylinder type structure or a conical bottom type structure.

The technical scheme of the utility model has the following advantages:

1. according to the multi-stage self-circulation aerobic granular sludge treatment device, the water body acceleration device is arranged at the inlet of the main body, so that the water body flowing through the main body is accelerated, the kinetic energy of the water body is utilized to stir the water body in the main body, a submersible stirring device is not required, the energy consumption can be reduced, and the multi-stage self-circulation aerobic granular sludge treatment device is beneficial to environmental protection; and compared with a micro-gas aeration stirring mode, the aeration in the anoxic zone is not needed, the dissolved oxygen content in the anoxic zone can be controlled more accurately, the denitrification effect is improved, and the water purification effect is improved.

2. The multi-stage self-circulation aerobic granular sludge treatment device provided by the utility model has the advantages that the central cylinder supports the upflow, the water flow on the periphery of the ring is downward, and the reverse flow state is favorable for the full contact of thalli and water pollutants. The jet flow of the bottom water inlet can re-enter the part after the anoxic reaction into the central ascending pipe, so that an internal circulation system is formed. On one hand, raw water can be diluted, and the buffer effect is realized on organisms, on the other hand, the flow-making mixing can be realized, and the stirring effect is improved.

3. According to the multistage self-circulation aerobic granular sludge treatment device provided by the utility model, the central anoxic zone is in the bottom and enters the aerobic zone in a radiation manner from the periphery, water is uniformly distributed, and aerobic internal reflux water is mixed and enters the aerobic zone together, so that the pollution load of the water inlet aerobic zone is greatly reduced, and the stable operation of a system is facilitated.

4. The multi-stage self-circulation aerobic granular sludge treatment device provided by the utility model can form a high-concentration sludge layer in the sludge filtering area, and after a water body is filtered, the turbidity of suspended matters in the effluent is lower, and the quality of the effluent is better. And the load is high, the occupied area is saved, the use of the assistance of inclined plates and the like is avoided, and the maintenance cost is reduced.

5. According to the multi-stage self-circulation aerobic granular sludge treatment device provided by the utility model, the aerobic granular sludge is adopted in the aerobic zone, the synchronous nitrogen and phosphorus removal can be realized, and the occupied area is small.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural view of a multistage self-circulation aerobic granular sludge treatment apparatus provided in one embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

FIG. 3 is a top view (partial structure) of FIG. 1;

FIG. 4 is a schematic structural view of a multistage self-circulation aerobic granular sludge treatment apparatus provided in yet another embodiment of the present invention;

FIG. 5 is an enlarged view of a portion of the structure of FIG. 4;

fig. 6 is a top view (partial structure) of fig. 4.

Description of reference numerals:

1-a body; 2-an aerobic zone; 3-anoxic zone;

4-a mud filtration zone; 5-clear water buffer zone; 6-a central cylinder;

7-a central riser; 8-an inlet; 9-an outlet;

10-water ejector; 11-accelerating jet pipe; 12-a throat;

13-a mud filter layer; 14-gas stripping ascending channel; 15-a transition flow guide channel;

16-a first sludge recirculation channel; 17-a second sludge recirculation channel;

18-sludge bucket; 19-an aeration device; 20-a sludge discharge pipe;

21-a pre-mixing zone; 22-a venting valve; 23-a manhole;

24-a water outlet weir trough; 25-a first notch; 26-a second notch;

27-a baffle plate; 28-water body passage.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

FIG. 1 is a schematic structural view of a multistage self-circulation aerobic granular sludge treatment apparatus provided in one embodiment of the present invention; as shown in fig. 1, the present embodiment provides a multi-stage self-circulation aerobic granular sludge treatment apparatus, comprising: the main body 1 is provided with an inlet 8 and an outlet 9, for example, the main body 1 can be a straight cylinder structure or a conical bottom structure. The inlet 8 may be located at the bottom of the body 1 and the outlet 9 may be located at a side wall of the body 1 near the top.

Wherein, the inside of main part 1 is provided with anoxic zone 3 and aerobic zone 2, and wherein, anoxic zone 3 is located the central point of main part 1, and aerobic zone 2 encircles anoxic zone 3 and sets up. A mud filtering area 4 is arranged above the aerobic area 2; the water inlet end of the mud filtering area 4 is communicated with the aerobic area 2, and the water outlet end of the aerobic area 2 is communicated with the outlet 9.

The water body accelerating device is connected with the inlet 8, at least one part of the inner diameter of the water body accelerating device is reduced along the flowing direction of the water body, and the water body can be accelerated when flowing through.

And a central cylinder 6 which may be disposed in the main body 1 in a vertical direction, and an axis of the central cylinder 6 may be aligned with an axis of the main body 1. The hollow area in the central cylinder 6 forms an anoxic area 3, and the area between the outer wall of the central cylinder 6 and the inner wall of the main body 1 forms an aerobic area 2; the water inlet end of the central cylinder 6 is arranged corresponding to the water outlet end of the water body accelerating device, fig. 2 is an enlarged schematic view of a partial structure of fig. 1, and as shown in fig. 2, the end of the central cylinder 6 corresponding to the water body accelerating device is provided with a first gap 25 and a second gap 26. During the use, the water that spouts from water accelerating device stirs in anoxic zone 3, and later partly water flows back to water accelerating device through first breach 25, continues the blowout to participate in the stirring in-process. Another part of the water in the anoxic zone 3 flows into the aerobic zone 2 through the second gap 26.

An aeration device 19, arranged in the aerobic zone 2, adapted to provide oxygen to the microorganisms in the aerobic zone 2.

In the multi-stage self-circulation aerobic granular sludge treatment device provided by the embodiment, the water body acceleration device is arranged at the inlet 8 of the main body 1, so that the water body flowing through the main body 1 is accelerated, the water body in the main body 1 is stirred by utilizing the kinetic energy of the water body, a submersible stirring device is not required, the energy consumption can be reduced, and the multi-stage self-circulation aerobic granular sludge treatment device is beneficial to environmental protection; and, compared with the mode of micro-gas aeration stirring, the aeration in the anoxic zone 3 is not needed, the dissolved oxygen content in the anoxic zone 3 can be controlled more accurately, the denitrification effect is favorably improved, and the water purification effect is improved.

In this embodiment, the water acceleration device may include a water ejector 10, an acceleration nozzle 11, and a central ascending pipe 7; wherein, the water inlet end of the water ejector 10 is communicated with the inlet 8, and the water outlet end of the water ejector 10 is connected with the water inlet end of the accelerating spray pipe 11. Because, along the flowing direction of the water body, at least one part of the water ejector 10 and the accelerating jet pipe 11 are arranged in a conical shape; so that the water injected into the main body 1 through the water injector 10 has a certain initial kinetic energy and is accelerated again after flowing through the acceleration nozzle 11.

Wherein, the water outlet end of the accelerating spray pipe 11 is connected with the water inlet end of the central ascending pipe 7, and the central ascending pipe 7 is positioned inside the central cylinder 6 and is superposed with the axis of the central cylinder 6. The area between the outer wall of the central riser pipe 7 and the inner wall of the central tube 6 forms the anoxic zone 3. A first gap 25 is formed between the central ascending pipe 7 and the bottom of the central cylinder 6, fig. 5 is an enlarged schematic view of a partial structure of fig. 4, as shown in fig. 5, a water body enters the central ascending pipe 7 and moves upwards, then is sprayed out to the periphery through the top of the central ascending pipe 7, and falls back under the action of gravity, and a part of the water body returns to the central ascending pipe 7 through the first gap 25 to participate in stirring. The number of the accelerating nozzles 11 can be set as required to achieve the effects of multi-stage acceleration and multi-stage mixing.

Wherein, a second gap 26 is formed between the central cylinder 6 and the accelerating jet pipe 11, and a part of the water body falling back to the bottom of the central cylinder 6 enters the aerobic zone 2 through the second gap 26.

Wherein, in order to further improve the stirring effect on the water body, the bottom of the central ascending pipe 7 can be connected with a throat 12, the pipe diameter of the middle part of the throat 12 is smaller than the pipe diameters of the two end parts, and the water body can be accelerated after entering the central ascending pipe 7 through the throat 12.

Wherein, the pipe wall of the water outlet end of the central ascending pipe 7 can be provided with water holes, and a plurality of water holes are arranged along the circumferential direction of the central ascending pipe 7 at intervals. So set up for can produce the change of a velocity of flow and the change of direction when partial water flows through the water hole, be favorable to improving mixed effect, make the contact probability improvement of oxygen deficiency fungus and aquatic pollutant.

For example, when the main body 1 is a straight cylinder type structure, the anoxic zone 3 and the aerobic zone 2 can be connected through the inverted V-shaped water body channel 28. Furthermore, a premixing zone 21 may be disposed between the anoxic zone 3 and the aerobic zone 2, and the water flowing in from the second notch 26 enters the premixing zone 21 first, and then enters the aerobic zone 2 through a water passage 28 between the premixing zone 21 and the aerobic zone 2. So set up, can improve the plug flow effect to the water that gets into in the aerobic zone 2.

For example, when the main body 1 has a conical bottom structure, a baffle 27 may be disposed in the channel between the second gap 26 and the aerobic zone 2 to prolong the flow path of the water body and improve the stirring effect.

In this embodiment, the air lift ascending channel 14 is disposed in the aerobic zone 2, and the inner diameter of the air lift ascending channel 14 gradually decreases along the flowing direction of the water body, so that the channel cross-sectional area of the air lift ascending channel 14 is reduced), and the air lift effect of the aerobic zone 2 can be utilized to improve the drainage effect.

Wherein, the aeration device 19 can be arranged at the bottom of the aerobic zone 2 and comprises a plurality of aeration pipes, the air outlet ends of the aeration pipes are provided with a plurality of aeration heads, and the air inlet ends of the aeration pipes are communicated with an external air source. The aeration device 19 can provide oxygen to the aerobic microorganisms in the aerobic zone 2 as needed.

In this embodiment, a transition diversion channel 15 is arranged in the aerobic zone 2, one end of the transition diversion channel is connected with the gas stripping ascending channel 14, and the other end of the transition diversion channel is communicated with the water inlet end of the mud filtering zone 4. The water body flows upwards to the highest point through the gas stripping ascending channel 14, then turns back downwards to enter the transition flow guide channel 15 and flows downwards.

In this embodiment, a first sludge return channel 16 is disposed in the aerobic zone 2, one end of which is communicated with the transition diversion channel 15, and the other end of which is communicated with a water channel 28 between the anoxic zone 3 and the aerobic zone 2. The heavier particle sludge contained in the water exiting the transitional diversion canal 15 can flow from the first sludge recirculation canal 16 to the pre-mixing zone 21 or directly to the aerobic zone 2. A part of the water body and the lighter sludge particles contained in the water body can then enter the sludge filtration zone 4. Along with the accumulation of the sludge flocs, a suspended sludge filtering layer 13 can be formed in the sludge filtering area 4, and when a water body passes through the sludge filtering layer 13 from bottom to top, impurities in the water body are adsorbed, so that the effect of filtering and purifying the water body is achieved.

In this embodiment, be provided with mud support hopper 18 between the end of intaking of transition water conservancy diversion passageway 15 and mud filtration district 4, mud support hopper 18 can play certain support and block the effect to mud filter layer 13, prevents that the mud granule from running off rapidly, can make the concentration of mud filter layer 13 in mud filtration district 4 keep dynamic stability, is favorable to improving the purifying effect to the water. And the sludge is fed from the bottom to the top of the sludge hopper 18, and a second sludge return channel 17 is arranged above the sludge hopper, so that the sludge layer 13 keeps dynamic stability and does not accumulate sludge.

In this embodiment, a second sludge recirculation channel 17 is provided in the aerobic zone 2, one end of which is communicated with the sludge filtering zone 4, and the other end of which is communicated with the water inlet end of the acceleration nozzle 11. A part of the water flowing out of the sludge filter layer 13 can flow back to the accelerating jet pipe 11 through the second sludge return channel 17 and participate in the circulation stirring again.

In this embodiment, the inlet end of the second sludge recirculation channel 17 is provided with a screening plate; the screening board includes the plate body of a plurality of parallel interval settings, and the gap between two adjacent plate bodies is suitable for mud to pass through. Wherein, the plate body can slope the setting, and mud strikes the plate body back along the plate body landing, piles up and forms mud filtering layer 13. So set up, can maintain the mud concentration in mud filtration district 4, prevent that a large amount of mud from running off through second mud return channel 17. The water passes through the mud filter layer 13, the carried mud is intercepted, and the particles are increased continuously. The sludge in the sludge filtering layer 13 is continuously increased, and a part of the sludge enters the second sludge return channel 17 through the gaps between the plate bodies to be discharged or recycled. The mud filter layer 13 is a dynamic mud filter layer 13, which can not cause the deterioration of the quality of the discharged water caused by the over-long fermentation of the mud.

In this embodiment, the positions of the sludge filtering area 4, the gas stripping ascending channel 14, the transition diversion channel 15, the first sludge recirculation channel 16 and the second sludge recirculation channel 17 may be designed as required. FIG. 4 is a schematic structural view of a multistage self-circulation aerobic granular sludge treatment apparatus provided in yet another embodiment of the present invention; as shown in fig. 4, for example, when the air-lift riser channel 14 is disposed to conform to the outer wall of the central tube 6, the mud-filtering zone 4 is located at the outer ring. FIG. 1 is a schematic structural view of a multistage self-circulation aerobic granular sludge treatment apparatus provided in one embodiment of the present invention; as shown in fig. 1, for example, when the air-lift riser channel 14 is arranged against the inner wall of the body 1, the mud-filtering zone 4 is located in the inner ring.

Fig. 3 is a plan view (partial structure) of fig. 1, fig. 6 is a plan view (partial structure) of fig. 4, and as shown in fig. 3 and fig. 6, in the present embodiment, the multistage self-circulation aerobic granular sludge treatment apparatus further includes a water outlet weir trough 24 disposed along the circumferential direction of the inner wall of the main body 1; the water outlet weir groove 24 is positioned above the mud filtering area 4, the water inlet end of the water outlet weir groove 24 is communicated with the water outlet end of the mud filtering area 4, and the water outlet end of the water outlet weir groove 24 is communicated with the outlet 9. After the water body flows upwards and passes through the mud filter layer 13, suspended matters are basically removed, and after reaching the clear water buffer area 5 above the mud filter layer 13, the water body rises to enter the annular water outlet weir groove 24 to be collected and then is discharged from the water outlet pipe connected with the outlet 9.

In this embodiment, the multi-stage self-circulation aerobic granular sludge treatment device further comprises a sludge discharge pipe 20, an inlet end of the sludge discharge pipe 20 is communicated with the bottom of the main body 1, an outlet end of the sludge discharge pipe 20 extends out of the main body 1, and an outlet end of the sludge discharge pipe 20 is suitable for being connected with a sludge storage device. The sludge discharge pipe 20 at the bottom periodically discharges the eliminated floc sludge so that the internal granular sludge can survive for a long time.

In this embodiment, the multi-stage self-circulation aerobic granular sludge treatment device further comprises a vent valve 22, which is arranged at the top of the main body 1 and is suitable for discharging the gas generated in the anoxic zone 3.

In this embodiment, a manhole 23 is provided at the top of the body 1.

During aeration, the granular sludge in the aerobic zone 2 is in a suspended state under the action of gas stripping, the diameters of granules gradually decrease from bottom to top under the action of gravity, and tiny granular sludge and a small part of floc sludge exist at the uppermost part, and the part enters the transition flow guide channel 15 after the gas stripping rises to the top under the action of water flow.

It should be noted that the low pressure referred to in this application is a relative concept, and the design of each backflow point is based on the bernoulli principle, that is, the pressure at the position where the flow rate of the liquid is high is smaller than that at the position where the flow rate of the liquid is low, and the liquid is forced to backflow by the pressure difference generated between the two positions.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the utility model.

Claims (17)

1. A multistage self-circulation aerobic granular sludge treatment device is characterized by comprising:

the main body is provided with an inlet and an outlet, an anoxic zone and an aerobic zone are arranged in the main body, and a sludge filtering zone is arranged above the aerobic zone;

the water body accelerating device is connected with the inlet, and at least one part of the inner diameter of the water body accelerating device is reduced along the flowing direction of the water body;

the central cylinder is arranged in the main body, the anoxic zone is formed in the area in the central cylinder, and the aerobic zone is formed in the area between the outer wall of the central cylinder and the inner wall of the main body; the water inlet end of the central cylinder is arranged corresponding to the water outlet end of the water body accelerating device, and a first gap and a second gap are arranged at one end of the central cylinder corresponding to the water body accelerating device; one part of water in the anoxic zone flows back to the water accelerating device through the first gap, and the other part of water in the anoxic zone flows to the aerobic zone through the second gap;

the aeration device is arranged in the aerobic zone and comprises a plurality of aeration pipes, a plurality of aeration heads are arranged at the air outlet ends of the aeration pipes, and the air inlet ends of the aeration pipes are communicated with an external air source and are suitable for providing oxygen for microorganisms in the aerobic zone;

the water inlet end of the mud filtering area is communicated with the aerobic area, and the water outlet end of the aerobic area is communicated with the outlet.

2. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 1, wherein the water body acceleration means comprises:

a water ejector;

the water ejector is communicated with the inlet, and at least one part of the water ejector is arranged in a conical shape along the flowing direction of the water body; the central cylinder cover is buckled above the water ejector, and the second gap is formed between the central cylinder and the water ejector.

3. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 2,

the water body accelerating device also comprises at least one accelerating jet pipe, and the accelerating jet pipe is covered and buckled above the water ejector;

at least one part of the accelerating jet pipe is arranged in a conical shape along the flowing direction of the water body;

the central cylinder cover is buckled above the accelerating spray pipe, and the second gap is formed between the central cylinder and the accelerating spray pipe.

4. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 3, wherein,

the oxygen-deficient area is formed in the area between the central riser pipe and the central cylinder;

at least a portion of the central riser pipe is conically configured;

the first gap is formed between the central ascending pipe and the central cylinder;

the water inlet end of the central ascending pipe is arranged corresponding to the water outlet end of the accelerating spray pipe.

5. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 4, wherein,

and a water passing hole is formed in the water outlet end of the central ascending pipe and is arranged along the circumferential direction of the central ascending pipe.

6. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 1, wherein,

the anoxic zone is connected with the aerobic zone through an inverted V-shaped water body channel.

7. The multi-stage self-circulating aerobic granular sludge treatment plant according to any of the claims 1 to 6,

and a gas stripping ascending channel is arranged in the aerobic zone, and the inner diameter of the gas stripping ascending channel gradually decreases along the flowing direction of the water body.

8. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 7, wherein,

the air lifting channel is attached to the outer wall of the central cylinder or attached to the inner wall of the main body.

9. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 7, wherein,

a transition flow guide channel is arranged in the aerobic zone, one end of the transition flow guide channel is connected with the gas lifting channel, and the other end of the transition flow guide channel is communicated with the water inlet end of the mud filtering zone.

10. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 9, wherein,

and a sludge supporting bucket is arranged between the transition diversion channel and the water inlet end of the sludge filtering area, so that the concentration of a sludge filtering layer in the sludge filtering area is kept dynamically stable.

11. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 9, wherein,

and a first sludge backflow channel is arranged in the aerobic zone, one end of the first sludge backflow channel is communicated with the transition flow guide channel, and the other end of the first sludge backflow channel is communicated with a water body channel between the anoxic zone and the aerobic zone.

12. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 1, wherein,

and a second sludge backflow channel is arranged in the aerobic zone, one end of the second sludge backflow channel is communicated with the sludge filtering zone, and the other end of the second sludge backflow channel is communicated with the water body accelerating device.

13. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 12, wherein,

the inlet end of the second sludge backflow channel is provided with a screening plate;

the screening plate comprises a plurality of plate bodies arranged in parallel at intervals, and gaps between every two adjacent plate bodies are suitable for water bodies to pass through.

14. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 1, wherein,

the water outlet weir groove is arranged along the circumferential direction of the inner wall of the main body;

the water outlet weir groove is positioned above the mud filtering area, the water inlet end of the water outlet weir groove is communicated with the water outlet end of the mud filtering area, and the water outlet end of the water outlet weir groove is communicated with the outlet.

15. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 1, wherein,

the sludge discharging device is characterized by further comprising a sludge discharging pipe, wherein the inlet end of the sludge discharging pipe is communicated with the bottom of the main body, the outlet end of the sludge discharging pipe extends out of the main body, and the outlet end of the sludge discharging pipe is suitable for being connected with sludge storage equipment.

16. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 1, wherein,

the device also comprises an exhaust valve which is arranged at the top of the main body and is suitable for exhausting the gas in the anoxic zone.

17. The multi-stage self-circulation aerobic granular sludge treatment plant according to claim 1, wherein,

the main body is of a straight cylinder type structure or a conical bottom structure.

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