Cyclone device applied to screening of aerobic granular sludge of SBR (sequencing batch reactor)

Abstract

The utility model provides a cyclone device applied to screening of aerobic granular sludge of an SBR (sequencing batch reactor), which comprises the SBR, a cyclone device, a cyclone device and a cyclone device, and is characterized in that an aerobic granular sludge mixed solution is filled in the SBR; the hydraulic cyclone system comprises a hydraulic cyclone and a mud bucket, the hydraulic cyclone is provided with a feed port, an overflow port and an underflow port, the underflow port of the hydraulic cyclone is connected with an inlet of the mud bucket, and an outlet of the mud bucket is connected with an inlet of the SBR reactor or connected with the outside of the mud bucket; the reflux system comprises a reflux pipe, a reflux pump and a control valve assembly, the outlet of the SBR is communicated with the feed port of the hydrocyclone through the reflux pipe, the reflux pump and the control valve assembly are arranged on the reflux pipe, and the control valve assembly controls the on-off and the flow velocity of the reflux pipe. According to the invention, the hydraulic shearing condition is adjusted by arranging the hydrocyclone, so that the purposes of shortening the granulation time of the aerobic granular sludge, shortening the starting time of the SBR reactor, enhancing the settleability of the aerobic granular sludge and improving the operation stability of the whole system are achieved.

Description

Technical Field

[0001] The present application relates to the field of sewage treatment, and in particular to a cyclone device used for aerobic granular sludge screening in an SBR reactor. Background Art

[0002] Aerobic granular sludge is a granular biopolymer formed by microorganisms under special conditions. Since it was first discovered in 1991, it has become a research hotspot for environmental protection researchers at home and abroad due to its dense structure, good sedimentation performance, high biomass, complex bacterial diversity and strong resistance to shock loads. After nearly two decades of development, aerobic granular sludge has made some remarkable achievements in the application of treating various types of actual wastewater.

[0003] The formation process of aerobic granular sludge is complex, and the factors that affect the cultivation of aerobic granular sludge are numerous and complex; and the shape, size and structure of aerobic granular sludge will affect the properties and benefits of aerobic granular sludge. Studies have shown that the main reason for the instability of aerobic granular sludge systems is the continuous increase in particle size. As the particle size of granular sludge continues to increase, the mass transfer resistance from the surface to the inside of the granular sludge increases, causing anaerobic acidification and hydrolysis inside the sludge, thus leading to the disintegration of granular sludge, system operation failure, and substandard effluent water quality.

[0004] The long start-up time, microbial enrichment, granulation process and difficulty in stable operation of aerobic granular sludge reactors have greatly affected the practical application of aerobic granular sludge technology. Therefore, how to accelerate the granulation process of aerobic granular sludge, shorten the start-up time, control the particle size and maintain its stable operation to promote the large-scale application of aerobic granular sludge technology has become a concern in the industry. Summary of the invention

[0005] The present application provides a cyclone device for aerobic granular sludge screening in an SBR reactor to solve the problems existing in the related art. The technical solution is as follows:

[0006] The embodiment of the present application provides a cyclone device for screening aerobic granular sludge in an SBR reactor, comprising:

[0007] An SBR reactor having an aerobic granular sludge mixed liquid inside;

[0008] The hydrocyclone system comprises a hydrocyclone and a mud bucket, wherein the hydrocyclone has a feed port, an overflow port and an underflow port, the underflow port of the hydrocyclone is connected to the inlet of the mud bucket, the outlet of the mud bucket is connected to the inlet of the SBR reactor or the outlet of the mud bucket is connected to the outside of the mud bucket;

[0009] The reflux system includes a reflux pipe, a reflux pump and a control valve assembly. The outlet of the SBR reactor is connected to the feed port of the hydrocyclone through the reflux pipe. The reflux pump and the control valve assembly are placed on the reflux pipe. The control valve assembly controls the on-off and flow rate of the reflux pipe.

[0010] In one embodiment, a PLC control system is further included, and the control valve assembly includes at least a solenoid valve, which is placed between the reflux pump and the SBR reactor, and the solenoid valve and / or the reflux pump are electrically connected to the PLC control system.

[0011] In one embodiment, a first flow meter is provided on the return pipe, and the first flow meter is placed between the return pump and the hydrocyclone.

[0012] In one embodiment, the control valve assembly further comprises a feed valve, which is disposed on the reflux pipe and between the reflux pump and the first flow meter.

[0013] In one embodiment, there are multiple hydrocyclones, which are connected in series in sequence. The feed port of the first hydrocyclone is connected to the outlet of the SBR reactor through a reflux pipe, the feed port of the next hydrocyclone is connected to the underflow port of the previous hydrocyclone through a series pipe, and the underflow ports of the multiple hydrocyclones are connected to the inlet of the mud bucket through the underflow pipe.

[0014] In one embodiment, a second flow meter and a series control valve are provided on the series pipe, the second flow meter is placed between the series control valve and the feed port of the hydrocyclone, and an underflow control valve is provided on the underflow pipe.

[0015] In one embodiment, a sludge control valve is provided on the underflow pipe, and the sludge control valve controls the on-off and flow rate of the underflow pipe.

[0016] In one embodiment, the overflow port of the hydrocyclone is connected to an overflow main pipe, the overflow main pipe is connected to a first overflow branch pipe, a first overflow control valve is provided on the first overflow branch pipe, and the outlet of the first overflow branch pipe is connected to the inlet of the SBR reactor.

[0017] In one embodiment, the overflow main pipe is further connected to a second overflow branch pipe, the second overflow branch pipe is provided with a second overflow control valve, and the outlet of the second overflow branch pipe is connected to the outside of the hydrocyclone.

[0018] In one embodiment, the outlet of the mud hopper is connected to a mud hopper return pipe, and the mud hopper is connected to the inlet of the SBR reactor through the mud hopper return pipe; and / or the mud hopper is connected to the outside of the mud hopper through the mud hopper return pipe.

[0019] The advantages or beneficial effects of the above technical solution include at least:

[0020] The cyclone device of the present application includes an SBR reactor, a hydrocyclone system and a reflux system. The aerobic granular sludge in the SBR reactor enters the hydrocyclone through a reflux pipe and a reflux pump. The sludge mixture entering the hydrocyclone generates centrifugal force in the hydrocyclone and is separated according to the sludge particles. The sludge with high density flows into the mud bucket through the bottom flow port of the hydrocyclone, and the sludge particles with low density are discharged through the overflow port to achieve the separation of the sludge. Since a control valve assembly is provided, the control valve assembly can control the on-off and flow rate of the reflux pipe, thereby controlling the strength of the hydraulic shear inside the hydrocyclone, accelerating the granulation process of aerobic granular sludge, and controlling the separation degree of aerobic granular sludge at the same time, and screening aerobic granular sludge of different particle sizes. The present application adjusts the hydraulic shear conditions through the setting of the hydrocyclone to shorten the granulation time of aerobic granular sludge, shorten the start-up time of the SBR reactor, enhance the sedimentation of aerobic granular sludge, and improve the operating stability of the entire system.

[0021] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0023] Figure 1 It is a schematic diagram of the structure of a cyclone device used for aerobic granular sludge screening in SBR reactor;

[0024] Figure 2 It is a schematic diagram of the structure of a hydrocyclone;

[0025] Description of reference numerals:

[0026] 1. SBR reactor; 2. hydrocyclone system; 3. reflux system; 20. hydrocyclone; 21. mud hopper; 201. feed port; 202. overflow port; 203. underflow port; 30. reflux pipe; 31. reflux pump; 32. solenoid valve; 4. PLC control system; 33. feed valve; 34. first flow meter; 206. overflow main pipe; 204. first overflow branch pipe; 205. second overflow branch pipe; 207. first overflow control valve; 216. second overflow control valve; 208. mud hopper reflux pipe; 209. underflow control valve; 210. series pipe; 213. underflow pipe; 211. sludge reflux control valve; 212. sludge discharge control valve; 214. second flow meter; 215. series control valve. DETAILED DESCRIPTION

[0027] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0028] like Figure 1 , Figure 2 As shown, the embodiment of the present application provides a cyclone device for aerobic granular sludge screening in an SBR reactor, comprising an SBR reactor 1, a hydrocyclone system 2 and a reflow system 3. The SBR reactor 1 has an aerobic granular sludge mixed liquid inside, and the aerobic granular sludge mixed liquid can enter the hydrocyclone 20 through the reflow system 3 for separation.

[0029] In order to separate the sludge, the hydrocyclone system 2 includes a hydrocyclone 20 and a mud bucket 21. The hydrocyclone 20 has a feed port 201, an overflow port 202 and an underflow port 203. The underflow port 203 of the hydrocyclone 20 is connected to the inlet of the mud bucket 21, and the outlet of the mud bucket 21 is connected to the inlet of the SBR reactor 1 or the outlet of the mud bucket 21 is connected to the outside of the mud bucket 21.

[0030] In order to achieve the connection between the SBR reactor 1 and the hydrocyclone 20, the reflux system 3 includes a reflux pipe 30, a reflux pump 31 and a control valve assembly. The outlet of the SBR reactor 1 is connected to the feed port 201 of the hydrocyclone 20 through the reflux pipe 30, and the reflux pump 31 and the control valve assembly are placed on the reflux pipe 30. The control valve assembly controls the on-off and flow rate of the reflux pipe 30. The aerobic granular sludge mixed liquid in the SBR reactor 1 is transported to the hydrocyclone 20 through the reflux pipe 30 and the reflux pump 31.

[0031] In order to control the on-off and flow rate of the reflux pipe 30, the control valve assembly includes a solenoid valve 32, which is placed between the reflux pump 31 and the SBR reactor 1, and the on-off of the reflux pipe 30 is controlled by the solenoid valve 32. In order to realize the intelligent control of the solenoid valve 32 and the reflux pump 31, the cyclone device of the present application also includes a PLC control system 4, and the solenoid valve 32 and / or the reflux pump 31 can be electrically connected to the PLC control system 4. The solenoid valve 32 and the reflux pump 31 are controlled by the PLC control system 4 to control the start and stop of the hydrocyclone 20, and the opening time and cycle of the hydrocyclone 20 can be set by the PLC control system 4. The above-mentioned PLC control system 4 is an existing PLC control system, and the control mode and control method of the PLC control system 4 are all prior art.

[0032] In the automatic control stage through the PLC control system 4 , the operating parameters of the solenoid valve 32 can be set through the PLC control system 4 to automatically control the opening time and duration of the hydrocyclone 20 , thereby accurately controlling the operation of the hydrocyclone 20 .

[0033] In order to realize manual control, the control valve assembly further includes a feed valve 33, which is arranged on the reflux pipe 30. A first flow meter 34 is also arranged on the reflux pipe 30, and the first flow meter 34 is arranged between the reflux pump 31 and the hydrocyclone 20, and the feed valve 33 is arranged between the reflux pump 31 and the first flow meter 34. In the manual control stage, the start and stop of the feed valve 33 can be manually adjusted to achieve the staged control of the start and stop of the hydrocyclone system 2.

[0034] The overflow port 202 of the hydrocyclone 20 is connected to an overflow main pipe 206, to which a first overflow branch pipe 204 is connected, and an overflow control valve 207 is provided on the first overflow branch pipe 204, and the outlet of the first overflow branch pipe 204 is connected to the inlet of the SBR reactor 1. The overflow main pipe 206 is also connected to a second overflow branch pipe 205, and a second overflow control valve 216 is provided on the second overflow branch pipe 205, and the outlet of the second overflow branch pipe 205 is connected to the outside of the hydrocyclone 20. The low-density sludge in the hydrocyclone 20 can be directly discharged through the second overflow branch pipe 205, and can also be returned to the SBR reactor 1 through the first overflow branch pipe 204.

[0035] The outlet of the mud hopper 21 is connected to a mud hopper return pipe 208, and the mud hopper 21 is connected to the inlet of the SBR reactor 1 through the mud hopper return pipe 208. A sludge return control valve 211 may be provided between the outlet of the mud hopper 21 and the inlet of the SBR reactor 1, and the sludge return control valve 211 controls the return of the sludge in the mud hopper 21 to the SBR reactor 1. The mud hopper 21 may also be connected to the outside of the mud hopper 21 through the mud hopper return pipe 208 to directly discharge the sludge in the mud hopper 21, and a mud discharge control valve 212 may be provided on the mud hopper return pipe 208 to control the discharge of the sludge.

[0036] The underflow port 203 of the hydrocyclone 20 is connected to the inlet of the mud hopper 21 through the underflow pipe 213. The underflow pipe 21 is provided with a sludge control valve 209, which controls the on-off and flow rate of the underflow pipe 21. The aerobic granular sludge mixed liquid in the SBR reactor 1 is transported to the hydrocyclone 20 through the return pipe 30 and the return pump 31 for centrifugal motion. Due to the different centrifugal forces, the sludge particles with high density are subjected to large centrifugal forces, and perform external cyclonic motion in the hydrocyclone 20, and are discharged from the underflow port 203 at the bottom of the hydrocyclone 20 into the mud hopper 21, and can be returned to the SBR reactor 1 through the mud hopper return pipe 208, or can be directly discharged. The sludge particles with low density perform internal cyclone motion in the hydrocyclone 20 and can be directly discharged through the overflow port 202 and the second overflow branch pipe 205 , or returned to the SBR reactor 1 through the overflow port 202 and the first overflow branch pipe 204 .

[0037] In one embodiment, in order to achieve a better screening effect of sludge particles, the number of hydrocyclones 20 is set to be multiple, and multiple hydrocyclones 20 are connected in series in sequence. The feed port 201 of the first hydrocyclone 20 is connected to the outlet of the SBR reactor 1 through the return pipe 30, and the feed port 201 of the next hydrocyclone 20 is connected to the underflow port 203 of the previous hydrocyclone through the series pipe 210, and the underflow ports 203 of the multiple hydrocyclones 20 are all connected to the inlet of the mud bucket 21 through the underflow pipe 213.

[0038] Preferably, the number of the hydrocyclones 20 can be three. The feed port 201 of the first hydrocyclone 20 is connected to the outlet of the SBR reactor 1 through the reflux pipe 30; the feed port 201 of the second hydrocyclone 20 is connected to the underflow port 203 of the first hydrocyclone 20 through the series pipe 210; the feed port 201 of the third hydrocyclone 20 is connected to the underflow port 203 of the second hydrocyclone 20 through the series pipe 210. The underflow ports 203 of the first hydrocyclone 20, the second hydrocyclone 20 and the third hydrocyclone 20 are connected to the inlet of the mud bucket 21 through the underflow pipe 213.

[0039] Furthermore, the series pipe 210 is provided with a second flow meter 214 and a series control valve 215, and the second flow meter 214 is placed between the series control valve 215 and the feed port 201 of the hydrocyclone 20. The underflow pipe 213 is provided with an underflow control valve 209, and the underflow control valve 209 controls the transportation of sludge in the hydrocyclone 203 to the mud hopper 21.

[0040] The hydrocyclone system 2 of the present application is composed of one hydrocyclone 20, or a plurality of hydrocyclones 20 connected in series. According to the growth of aerobic granular sludge and the characteristics of different pollutants in different water qualities, a plurality of hydrocyclones 20 connected in series can effectively screen aerobic granular sludge of different particle sizes, retain or discharge granular sludge of different particle sizes, and meet different sewage treatment requirements.

[0041] The hydrocyclone 20 has a solid-liquid separation function. The smaller the particle size and the lighter the mass of the granular sludge, the smaller the radius of the equilibrium track it occupies in the cyclone, and the less likely it is to move to the side wall of the cyclone and be effectively separated. Based on the principle of the hydrocyclone 20, the growth of aerobic granular sludge is promoted by hydraulic shear force, and the hydrocyclone 20 is used to screen sludge of different particle sizes, promote the growth and enrichment of effective microorganisms, and ensure the stable operation of the aerobic granular sludge system, which has become one of the effective methods to promote the application of aerobic granular sludge.

[0042] The flow rate of the feed port 201 of the hydrocyclone 20 is controlled by the control valve assembly and the first flowmeter 34, so as to better control the strength of the hydraulic shear force inside the hydrocyclone 20, accelerate the granulation process of the aerobic granular sludge, control the separation degree of the aerobic granular sludge, and achieve the screening of aerobic granular sludge of different particle sizes. The first overflow control valve 207 or the second overflow control valve 216 of the overflow port 202 can be used to control the diversion ratio of the hydrocyclone 20 to achieve the separation of particles of different particle sizes.

[0043] The production capacity and separation particle size of the hydrocyclone 20 generally increase with the increase of its diameter D. Under the condition that the same performance index can be obtained, it is preferred to use a hydrocyclone 20 with a larger diameter. The increase in the size of the feed port 201 of the hydrocyclone 20 will also lead to an increase in production capacity and separation particle size. The optimal feed port 201 diameter is d e =(0.15-0.25)D. The diameter of the overflow port 202 should be slightly larger than the diameter of the feed port 201. Generally, the diameter of the overflow port 202 is d o =(1-2)d e The optimal inner diameter of the overflow main pipe 204 is d o =(0.2-0.3)D, the optimal bottom flow outlet diameter is d u =(0.07—0.10)D.

[0044] As shown in Table 1 below, the aerobic granular sludge settling performance table after the cyclone device used for aerobic granular sludge screening in SBR reactor 1; Table 2 is the aerobic granular sludge particle size table:

[0045] Table 1

[0046]

[0047]

[0048] Table 2

[0049]

[0050]

[0051] The dominant genus Candidatus Competibacter in aerobic granular sludge is a glycogen-accumulating bacterium. Granular sludge of the dominant genus secretes PS with strong gel properties, which helps to maintain the stability of AGS. It is also a glycogen-accumulating bacterium that can store intracellular carbon sources and achieve endogenous denitrification. Its enrichment does not cause sludge viscosity and swelling, and its large enrichment is often detected in stably operating AGS. The abundance of this genus in aerobic granular sludge is 3497, while the abundance in ordinary aerobic pools is only 279.

[0052] The dominant genus Denitromonas with the highest abundance in aerobic granular sludge is a specialized halophilic heterotrophic nitrifying bacterium that participates in denitrification and has the ability to denitrify and has NO r and ClO 4 - The abundance of Thauera in aerobic granular sludge is 4617, while that in ordinary aerobic pools is only 262. The dominant genus Thauera is also present in aerobic granular sludge, which is also a denitrifying bacterium that plays an important role in the redox of nitrogen pollutants and the transfer of electrons to the electrode.

[0053] The microbial results show that, within the same period of time, after using the hydrocyclone 20, aerobic granular sludge has been rapidly cultured and formed, and it has certain advantages over ordinary aerobic in terms of nitrogen removal.

[0054] The present application controls the feed flow rate and separation pressure through the reflux pipe 30 and the control valve assembly. The higher the flow rate, the higher the separation degree (the higher the density of the underflow sludge), and the lower the flow rate, the lower the separation degree. By controlling the size of the feed flow rate, the size of the hydraulic shear force can be controlled, thereby controlling the screening of particles of different particle sizes of aerobic granular sludge. The overflow valve controls the sludge flow rate of the overflow port 202, adjusts the underflow and overflow flow rates, and adjusts the diversion ratio of the hydrocyclone 20. The separation of aerobic granular sludge of different particle sizes is controlled by adjusting the diversion ratio, and the second overflow control valve 216 controls whether the sludge is discharged, and adjusts the sludge discharge concentration according to the actual sludge properties and sludge discharge plan.

[0055] The use of the hydrocyclone 20 of the present application increases the hydraulic shear force, which is beneficial to promote the formation of aerobic granular sludge and accelerate the granulation process. The use of the hydrocyclone 20 promotes the simultaneous nitrification and denitrification of aerobic granular sludge and enhances the effect of nitrogen removal and phosphorus removal. The use of the hydrocyclone 20 enhances the sedimentation of aerobic granular sludge, accelerates the particle sedimentation rate, reduces the SVI value, can shorten the sludge granulation time, and is beneficial to the rapid start-up of the SBR reactor 1. The use of the hydrocyclone 20 can screen the sludge and discharge the large-size granular sludge with oxygen mass transfer limitations, which is beneficial to the stability of the granular sludge and avoids the disintegration of the granular sludge.

[0056] The hydrocyclone system 2 adopts a new sludge discharge method, which can selectively discharge inorganic sludge, which is conducive to the enrichment of organic sludge, improve the sludge MLVSS / MLSS value, and improve the sludge activity. The sludge discharge method of the hydrocyclone system 2 is conducive to the aerobic granular sludge to choose the appropriate sludge discharge method when running in different wastewater qualities.

[0057] It should be noted that the hydrocyclone 20, the reflux pump 31, the solenoid valve 32, the first flow meter 34, the second flow meter 214 and various control valves are all prior art, and there is no improvement on the structure of the above components. The discharge and reflux of sludge can be transported by the reflux pump 31. The first flow meter 34 and the second flow meter 214 of the present application can also be electrically connected to the PLC control system 4 and transmit the flow data to the PLC control system.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0059] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0060] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cyclone device for aerobic granular sludge screening in SBR reactor, characterized in that: include: An SBR reactor having an aerobic granular sludge mixed liquid inside; The hydrocyclone system comprises a hydrocyclone and a mud bucket, wherein the hydrocyclone has a feed port, an overflow port and an underflow port, the underflow port of the hydrocyclone is connected to the inlet of the mud bucket, the outlet of the mud bucket is connected to the inlet of the SBR reactor or the outlet of the mud bucket is connected to the outside of the mud bucket; The reflux system includes a reflux pipe, a reflux pump and a control valve assembly. The outlet of the SBR reactor is connected to the feed port of the hydrocyclone through the reflux pipe. The reflux pump and the control valve assembly are placed on the reflux pipe. The control valve assembly controls the on-off and flow rate of the reflux pipe.

2. The cyclone device for aerobic granular sludge screening in SBR reactor according to claim 1, characterized in that: It also includes a PLC control system. The control valve assembly at least includes a solenoid valve. The solenoid valve is placed between the reflux pump and the SBR reactor. The solenoid valve and / or the reflux pump are electrically connected to the PLC control system.

3. The cyclone device for aerobic granular sludge screening in SBR reactor according to claim 1, characterized in that: A first flow meter is arranged on the reflux pipe and is placed between the reflux pump and the hydrocyclone.

4. The cyclone device for aerobic granular sludge screening in SBR reactor according to claim 3, characterized in that: The control valve assembly also includes a feed valve, which is arranged on the reflux pipe and between the reflux pump and the first flow meter.

5. The cyclone device for aerobic granular sludge screening in SBR reactor according to claim 3, characterized in that: There are multiple hydrocyclones, which are connected in series in sequence. The feed port of the first hydrocyclone is connected to the outlet of the SBR reactor through a reflux pipe, the feed port of the next hydrocyclone is connected to the underflow port of the previous hydrocyclone through a series pipe, and the underflow ports of the multiple hydrocyclones are all connected to the inlet of the mud bucket through the underflow pipe.

6. The cyclone device for aerobic granular sludge screening in SBR reactor according to claim 5, characterized in that: The series pipe is provided with a second flow meter and a series control valve, the second flow meter is placed between the series control valve and the feed port of the hydrocyclone; the underflow pipe is provided with an underflow control valve.

7. The cyclone device for aerobic granular sludge screening in SBR reactor according to claim 5, characterized in that: A sludge control valve is provided on the underflow pipe, and the sludge control valve controls the on-off and flow rate of the underflow pipe.

8. The cyclone device for aerobic granular sludge screening in SBR reactor according to any one of claims 1 to 7, characterized in that: The overflow port of the hydrocyclone is connected to an overflow main pipe, the overflow main pipe is connected to a first overflow branch pipe, and a first overflow control valve is arranged on the first overflow branch pipe; the outlet of the first overflow branch pipe is connected to the inlet of the SBR reactor.

9. The cyclone device for aerobic granular sludge screening in SBR reactor according to claim 8, characterized in that: The overflow main pipe is also connected to a second overflow branch pipe, the second overflow branch pipe is provided with a second overflow control valve, and the outlet of the second overflow branch pipe is connected to the outside of the hydrocyclone.

10. The cyclone device for aerobic granular sludge screening in SBR reactor according to any one of claims 1 to 7, characterized in that: The outlet of the mud hopper is connected with a mud hopper return pipe, and the mud hopper is connected with the inlet of the SBR reactor through the mud hopper return pipe; and / or the mud hopper is connected with the outside of the mud hopper through the mud hopper return pipe.

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