A multi-stage sedimentation sludge granulation selection device

Abstract

The present application relates to sewage treatment equipment field, especially to a kind of multistage sedimentation sludge granulation selection device.It includes separation cylinder, filter cylinder and selection assembly.Separation cylinder is provided with a ring type selection cavity;Selection cavity is provided with multiple equal size selection chambers, and the bottom of selection cavity is provided with rotating ring frame, and the top is provided with cylinder cover;Rotating ring frame is sealingly and slidably connected with mud scraping partition plate.Filter cylinder is located in separation cylinder.Selection assembly is correspondingly arranged in selection chamber, including shear force generator, adjusting part and connecting part.The present application controls the settling selection pressure of different selection chambers by setting the sedimentation time in turn in equal difference shortening, and on the other hand, through the cooperation of mud scraping partition plate and selection assembly, the scraped sludge is subjected to hydraulic shear force, the sludge granulation selection mode of multistage sedimentation is various, and the sewage treatment is flexible and efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewage treatment equipment, in particular to a multi-stage sedimentation sludge granulation selection device. BACKGROUND

[0002] Sludge granulation selection is an important technical strategy in the field of wastewater treatment. The settling velocity of granular sludge is much higher than that of flocculent sludge, which can effectively reduce sludge loss and maintain high biomass concentration in the reactor. This is crucial for improving wastewater treatment efficiency and reducing subsequent treatment burden. Granular sludge forms a micro-ecosystem inside, with different populations of microorganisms (such as acid-producing bacteria and methanogens) distributed in layers within the granules, forming a symbiotic or mutualistic relationship. This structure helps maintain stable biochemical conditions and enhances the system's tolerance to water quality fluctuations and toxic substances. The large specific surface area of granular sludge allows for more complete contact between microorganisms and substrates, thereby increasing the degradation rate of organic matter and the efficiency of gas production. In addition, the formation of granular sludge helps shorten the diffusion distance of fermentation bacteria intermediates, promoting the degradation of complex organic matter. Granular sludge can withstand higher organic volumetric and hydraulic loads, allowing the reactor to maintain high efficiency under high load conditions. This is of great significance for treating high-concentration organic wastewater.

[0003] A Chinese patent with publication number CN218474923U discloses an improved double-zone sedimentation tank selective separation of aerobic granular sludge device, which includes: a first sedimentation tank; a second sedimentation tank arranged at the middle position inside the first sedimentation tank; a water inlet structure for the water inlet of the first sedimentation tank; a water outlet structure arranged above the second sedimentation tank for water outlet; a first sludge outlet structure and a second sludge outlet structure respectively connected with the first sedimentation tank and the second sedimentation tank and respectively used for discharging the first sludge in the first sedimentation tank and the second sludge in the second sedimentation tank; the first sedimentation tank and the second sedimentation tank form a double-zone sedimentation, and the water inlet structure and the water outlet structure form a circumferential inlet and central outlet water form, which can selectively separate according to the weight difference of the sludge, the heavy sludge particles can be precipitated at the bottom of the first sedimentation tank, the light flocculent sludge can be precipitated at the bottom of the second sedimentation tank, and the supernatant can be discharged from the water outlet structure.

[0004] The above-mentioned sludge granulation selection device selects sludge by peripheral water inlet and central water outlet. The selection object can only be divided into heavy sludge particles and light sludge flocculent, which not only has a single sludge grade division, but also lacks a design to promote sludge granulation, relying only on settling selection pressure to promote sludge granulation, resulting in an unreliable sludge granulation effect and limited wastewater treatment effect. SUMMARY

[0005] To address the problems existing in the background technology, a multi-stage sedimentation sludge granulation selection device is proposed. On the one hand, the settling selection pressure of different stage selection chambers is controlled by setting the sedimentation time of equal shortening time in sequence. On the other hand, the sludge scraping baffle and selection components work together to apply hydraulic shear force to the scraped sludge. The multi-stage sedimentation sludge granulation selection method is diverse, and the sewage treatment is flexible and efficient.

[0006] This invention proposes a multi-stage sedimentation granulation sludge selection device, including a separation cylinder, a filter cylinder, and selection components. The separation cylinder has a central channel and an annular selection chamber around its periphery. The selection chamber is divided into multiple equally sized graded selection chambers by a sludge scraper. A rotating ring frame, coaxial with and sealed to rotate within the selection chamber, is located at the bottom of each chamber, and a cylinder cover is installed at the top. A sludge outlet pipe communicating with the graded selection chambers is mounted on the rotating ring frame and is slidably and sealed to the sludge scraper. The cylinder cover has a set of inlet pipes, multiple sets of transfer pipe I, and a set of transfer pipe II. The inlet pipe and transfer pipe II are located on two adjacent sets of graded selection chambers, respectively. The multiple sets of transfer pipe I are located between the remaining two adjacent sets of graded selection chambers. The filter cylinder is located within the channel of the separation cylinder, with water entering through transfer pipe II at the top and exiting through the outlet pipe at the bottom. It contains filter elements. The selection components are arranged one-to-one in the grading selection chamber, including a pair of shear force generators that are raised and lowered on both sides of the grading selection chamber, an adjusting component located between the cylinder cover and the rotating ring frame, and a connecting component that drives the shear force generators on both sides to rise and fall alternately by adjusting the adjusting component.

[0007] Preferably, the settling selection pressure is controlled by setting the settling time in a differentially shortened manner along the water flow direction in a multi-component graded selection chamber.

[0008] Preferably, the grading and selection chamber is fan-shaped; the regulating element is located in the middle of the grading and selection chamber; the shear force generating elements are arranged in a mirror image on both sides of the regulating element; and the sludge scraping baffles are slidably set on both sides of the sludge discharge pipe to scrape up the sludge.

[0009] Preferably, the connector is a connecting chain, which is limited by an adjusting member to form a V-shaped structure. The length of both sides is adjusted by the adjusting member, which drives the shear force generating member on the corresponding side to move in opposite directions, up and down.

[0010] Preferably, the adjusting component includes two sets of mounting brackets located on the separating cylinder; the two sets of mounting brackets extend above the mud discharge pipe, and two sets of relatively rotating adjusting rollers are arranged between the two sets of mounting brackets; the connecting chain is located between the two sets of adjusting rollers and moves synchronously in a V-shape as the adjusting rollers rotate.

[0011] Preferably, the shearing force generating member comprises a shearing force generating frame connected with the connecting chain and slidingly arranged on the mud scraping partition plate; the shearing force generating frame is arranged as a frame body structure, slidingly connected with the inner wall of the selection chamber and provided with an aeration head connected with the external aeration equipment; the mud scraping partition plate is provided with a guide member guiding the shearing force generating frame.

[0012] Preferably, the shearing force generating frame is arranged as a half-fan-shaped frame body matching the shape of the selection chamber; the connecting chain is connected with the inner wall of the half-fan-shaped frame body; the aeration head is arranged on the inner wall of the half-fan-shaped frame body; the adjusting member is arranged at the middle position inside the two groups of shearing force generating frames which are mirror images and spliced into a complete fan shape.

[0013] Preferably, the guide member comprises a guide rail on the mud scraping partition plate; the end of the guide rail is provided with a limiting frame; the shearing force generating frame is provided with a sliding groove matched with the guide rail, and an elastic pulling member is arranged between the shearing force generating frame and the limiting frame; under the action of the elastic pulling member, the shearing force generating frame maintains a tendency to move upward.

[0014] Preferably, the filtering member comprises a filtering sleeve mounted in the filtering cylinder through a telescopic base; the filtering sleeve is provided with a filtering screen on the sleeve wall; the filtering sleeve moves up and down at the liquid level position; and the water outlet pipe is located at the bottom of the filtering sleeve.

[0015] Preferably, the bottom of the filtering cylinder is provided with a driving cover connected with the rotating ring frame and rotatable; the driving cover surrounds the water outlet pipe, and the inner wall of the driving cover is provided with a gear ring; the bottom of the filtering cylinder is further provided with a rotating gear; the gear is engaged with the gear ring to drive the rotation of the driving cover and the rotating ring frame.

[0016] Compared with the prior art, the present application has the following beneficial technical effects: a plurality of independent and interconnected selection chambers are arranged to form a multi-stage sedimentation path; during the movement of the sewage, on the one hand, the settling selection pressure of different selection chambers is controlled by sequentially arranging the sedimentation time which is shortened in equal difference; on the other hand, the hydraulic shearing force is exerted on the scraped sludge by the cooperation of the mud scraping partition plate and the selection assembly, so as to realize multi-stage sedimentation granulation of sludge particles.

[0017] The selection assembly can clean the sludge attached to the inner wall of the selection chamber and exert the hydraulic shearing force on the bottom sludge scraped by the mud scraping partition plate by the up-down movement of the shearing force generating frame. The hydraulic shearing force is formed by aeration of the aeration head and stirring of the water flow by up-down movement. By controlling the aeration intensity or using mechanical stirring to generate the hydraulic shearing force, combined with the effect of the settling selection pressure, the secretion of the microbial EPS in the sludge is promoted, the loose flocs are eliminated, and finally the corresponding level of granulation "skeleton" is constructed. The rotation of the rotating ring frame drives the sliding of the mud scraping partition plate, which not only scrapes the sludge, but also discharges the classified sludge particles. The multi-stage sedimentation granulation selection method is various, and the sewage treatment is flexible and efficient.

[0018] In addition, the sewage is finally arranged to enter the filter sleeve. The filter sleeve moves up and down at the liquid level position to collect the floating objects, so as to realize comprehensive and efficient treatment of the sewage. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 The figure is a top view of a multi-stage sedimentation type sludge granulation selection device.

[0020] Figure 2 The figure is a bottom view of a multi-stage sedimentation type sludge granulation selection device.

[0021] Figure 3 The figure is an internal structure diagram of a multi-stage sedimentation type sludge granulation selection device.

[0022] Figure 4 The figure is a sectional view (view angle one) of Figure 3

[0023] Figure 5 The figure is a sectional view (view angle two) of Figure 3

[0024] Figure 6 The figure is a structure diagram of a shear force generating part.

[0025] Figure 7 The figure is a structure diagram of a filter cylinder and a filter part.

[0026] Figure 8 The figure is an enlarged view of A in Figure 5

[0027] Reference signs: 1, separation cylinder; 2, mud scraping partition plate; 3, water inlet pipe; 4, transfer pipe two; 5, transfer pipe one; 6, filter cylinder; 7, rotating ring frame; 8, water outlet pipe; 9, mud outlet pipe; 10, adjusting part; 1001, mounting frame; 1002, adjusting roller; 11, connecting part; 12, shear force generating part; 1201, shear force generating frame; 1202, aeration head; 1203, guide rail; 1204, limiting frame; 1205, elastic pulling part; 13, gear; 14, gear ring; 15, driving cover; 16, filter part; 1601, filter sleeve; 1602, filter screen; 1603, telescopic base. DETAILED DESCRIPTION

[0028] Example one, the embodiment proposes a multi-stage sedimentation type sludge granulation selection device, as shown in Figures 1-5 ​​​As shown, including separation cylinder 1, filter cylinder 6 and selection assembly. The separation cylinder 1 is provided with a through slot in the center, and a ring-shaped selection cavity is arranged on the outer periphery; the selection cavity is separated into a plurality of equal-sized hierarchical selection chambers by the mud scraping partition 2, the bottom of the selection cavity is provided with a rotating ring frame 7 coaxial with it and sealed, the top is provided with a cylinder cover; the rotating ring frame 7 is provided with a mud outlet pipe 9 communicating with the hierarchical selection chamber, and is in sealed sliding connection with the mud scraping partition 2; the cylinder cover is provided with a group of water inlet pipes 3, a plurality of groups of transfer pipes one 5 and a group of transfer pipes two 4; a group of water inlet pipes 3 and a group of transfer pipes two 4 are respectively located on two adjacent groups of hierarchical selection chambers; a plurality of groups of transfer pipes one 5 are located between the remaining two adjacent groups of hierarchical selection chambers; the filter cylinder 6 is located in the through slot of the separation cylinder 1, the top is supplied with water through the transfer pipe two 4, the bottom is discharged with water through the water outlet pipe 8, and the inside is provided with a filter 16; the selection assembly is correspondingly arranged in the hierarchical selection chamber, including a pair of shear force generating members 12 arranged on both sides of the hierarchical selection chamber and lifted, an adjusting member 10 located between the cylinder cover and the rotating ring frame 7, and a connecting member 11 which is adjusted by the adjusting member 10 to drive the shear force generating members 12 on both sides to lift up and down staggered.

[0029] It needs to be further explained that the sedimentation time is set to be shortened in equal difference through a plurality of hierarchical selection chambers arranged in sequence along the water flow direction to control the sedimentation selection pressure, for example, three groups of hierarchical selection chambers, and the sedimentation time can be set to be 25min-15min-5min respectively. Through short-time sedimentation, slow-settling flocculation can be eliminated, and fast-settling particle precursors can be reserved. By setting the difference of sedimentation time, the screening and selection of particle precursors of different sizes are realized.

[0030] It needs to be further explained that the hierarchical selection chamber is set to be fan-shaped; the adjusting member 10 is located in the middle of the hierarchical selection chamber; the shear force generating member 12 is mirror image arranged on both sides of the adjusting member 10; the mud scraping partition 2 is arranged on both sides of the mud outlet pipe 9 by sliding to scrape up the sludge; the aerobic or anaerobic sludge is inoculated in the hierarchical selection chamber in advance before sewage treatment. The aerobic sludge contains polyphosphorus bacteria (PAOs), nitrifying bacteria (AOB / NOB), denitrifying bacteria (DNB), etc. The anaerobic sludge contains methanogenic bacteria (Methanosaeta), acid-producing bacteria, etc. The sewage flows through each hierarchical selection chamber in sequence to precipitate the particle precursors. After the precipitation is completed, the rotating ring frame 7 is reciprocally rotated in forward and reverse directions, and a plurality of mud scraping partitions 2 are synchronously slid to scrape up the sludge precipitated in each hierarchical selection chamber. The shear force generating member 12 is lifted, and at the same time, the hydraulic shear force is generated by controlling the aeration intensity (aerobic sludge) or using mechanical stirring (aerobic and anaerobic sludge). Under the action of hydraulic shear force and sedimentation selection pressure of different intensities, the microorganisms in the sludge secrete viscous EPS, eliminate loose flocculation, and finally build the corresponding level of granulation "skeleton". Finally, the sludge particles are pushed to the mud outlet pipe 9 by the sliding of the mud scraping partition 2 for discharge.

[0031] As Figure 6As shown, the connecting chain 11 is connected to the adjusting member 10, and the adjusting member 10 is used to limit the connecting chain 11 to form a V-shaped structure, and adjust the length of the two sides to drive the corresponding side shear force generating member 12 to move up and down in the opposite direction; the shear force generating member 12 is pulled to move up and down by the connecting chain, and the moving process can be aerated or mechanically stirred to form a hydraulic shear force on the sludge particle precursor.

[0032] As shown in the figure, Figure 6 The adjusting member 10 includes two groups of mounting frames 1001 located on the separation cylinder 1; the two groups of mounting frames 1001 extend above the sludge outlet pipe 9, and two groups of adjusting rollers 1002 driven by the motor are arranged between the two groups of mounting frames 1001; the connecting chain is located between the two groups of adjusting rollers 1002 and moves synchronously in a V-shaped manner with the rotation of the adjusting rollers 1002; in order to further improve the stability of the connecting chain, a gear structure can be arranged on the adjusting roller 1002, and the connecting chain is engaged with the gear structure. The connecting chain is limited by the two groups of adjusting rollers 1002 on one side to form a V-shaped structure, and is driven by the two groups of adjusting rollers 1002 to move up and down in the opposite direction on the other side.

[0033] As shown in the figure, Figure 6 The shear force generating member 12 includes a shear force generating frame 1201 connected with the connecting chain and slidingly arranged on the sludge scraping baffle 2; the shear force generating frame 1201 is arranged as a frame body structure, and is slidingly connected with the inner wall of the selection chamber while being provided with an aeration head 1202 connected with the external aeration equipment; the sludge scraping baffle 2 is provided with a guide member for guiding the shear force generating frame 1201; through the up-down movement of the shear force generating frame 1201, the attached sludge on the inner wall of the classification selection chamber can be cleaned on one side, and the bottom sludge scraped by the sludge scraping baffle 2 can be subjected to hydraulic shear force on the other side. The formation of the hydraulic shear force includes aeration of the aeration head 1202 and stirring of the water flow by up-down movement.

[0034] It should be further explained that the shear force generating frame 1201 is arranged as a half-fan-shaped frame body which is consistent with the shape of the classification selection chamber; the connecting chain is connected to the inner wall of the frame of the half-fan-shaped frame body; the aeration head 1202 is arranged on the inner wall of the frame of the half-fan-shaped frame body; the adjusting member 10 is arranged at the middle position inside the two groups of shear force generating frames 1201 which are mirror images and are spliced into a complete fan shape; the shear force generating frame 1201 moves with the sludge scraping baffle 2, the sludge precipitation is scraped by the sludge scraping baffle 2, and the two groups of shear force generating frames 1201 move up and down. The half-fan-shaped frame body provides a mounting position for the aeration head 1202, and at the same time makes the aeration have more variable directions and occupies less space. The adjusting member 10 is arranged at the middle position inside the two groups of shear force generating frames 1201 which move with the sludge scraping baffle 2, which not only can adjust the position of the connecting chain, but also can promote the movement of the sludge, and further assist the granulation of the sludge.

[0035] It needs to be further explained that the guide piece includes a guide rail 1203 on the mud scraping partition plate 2; the end of the guide rail 1203 is provided with a limiting frame 1204; a sliding groove matched with the guide rail 1203 is arranged on the shearing force generating frame 1201, and an elastic pulling piece 1205 is arranged between the shearing force generating frame 1201 and the limiting frame 1204; under the action of the elastic pulling piece 1205, the shearing force generating frame 1201 maintains the tendency of upward movement; when the shearing force generating frame 1201 on one side is pulled downward, the shearing force generating frame 1201 on the other side is automatically moved upward. In turn, the moving track of up and down alternately is formed. The sludge granulation is realized in the moving process.

[0036] As shown in Figure 7 The filter 16 includes a filter sleeve 1601 installed in the filter cylinder 6 through a telescopic base 1603; the filter sleeve 1601 is provided with a filter screen 1602 on the cylinder wall; the filter sleeve 1601 moves up and down at the liquid level position; the water outlet pipe 8 is located at the bottom of the filter sleeve 1601; the transfer pipe two 4 directly discharges the sewage after multi-stage precipitation into the filter sleeve 1601; by setting the filter sleeve 1601 to move up and down at the liquid level position, the water surface is pressed downward, and the negative pressure generated will bring the floating dirt on the surface into the filter sleeve 1601; the water in the cylinder is discharged by upward movement, and the floating matter is retained in the cylinder. The floating matter can be collected by repeated lifting of the filter sleeve 1601, and the final purification is realized.

[0037] As shown in Figure 8 The filter cylinder 6 is provided at the bottom with a drive cover 15 connected with the rotating ring frame 7 and rotatable; the drive cover 15 surrounds the water outlet pipe 8, and the inner wall is provided with a tooth ring 14; the filter cylinder 6 is further provided at the bottom with a gear 13 driven to rotate by a motor; the gear 13 is engaged with the tooth ring 14 to drive the rotation of the drive cover 15 and the rotating ring frame 7; the movement of the mud scraping partition plate 2 is realized by the rotation of the rotating ring frame 7.

[0038] In the second embodiment, the multi-stage sedimentation sludge granulation selection method is proposed based on the multi-stage sedimentation sludge granulation selection device in the first embodiment. The specific steps are as follows: Before the sewage treatment, the anaerobic or aerobic sludge is inoculated in the grading selection chamber according to the composition of the sewage. Then the sewage enters the first-stage grading selection chamber from the water inlet pipe 3 for sedimentation, and the sedimentation time is 25 min. Then the sewage passes through the second and third-stage grading selection chambers through the multiple groups of transfer pipes one 5, and the sedimentation times are 15 min and 5 min, respectively. During the above sedimentation process, the rotating ring frame 7 rotates forward and backward, and the multiple groups of sludge scraping partitions 2 slide synchronously to scrape the sludge in each grading selection chamber. The connecting chain drives the two shear force generators 12 to move up and down through the rotation of the two groups of adjusting rollers 1002. Through the up and down movement of the shear force generation frame 1201, on the one hand, the sludge attached to the inner wall of the grading selection chamber can be cleaned, and on the other hand, the bottom sludge scraped by the sludge scraping partition 2 can be subjected to hydraulic shear force. The formation of the hydraulic shear force includes aeration by the aeration head 1202 and stirring of the water flow by the up and down movement. By controlling the aeration intensity (for aerobic sludge) or using mechanical stirring (for aerobic and anaerobic sludge) to generate hydraulic shear force, combined with the sedimentation selection pressure, the secretion of sticky EPS by the microorganisms in the sludge is promoted, and loose flocs are eliminated, and finally the corresponding grade of granulation "skeleton" is constructed. Finally, the sludge particles are pushed to the sludge outlet pipe 9 by the sliding of the sludge scraping partition 2 and discharged. After the multi-stage sedimentation sludge granulation selection, the sewage is discharged into the filter sleeve 1601 through the transfer pipe two 4. The filter sleeve 1601 moves up and down at the liquid level position, and the downward movement drives the water surface, and the negative pressure generated will bring the surface floating dirt into the filter sleeve 1601, and the upward movement will discharge the water in the cylinder, and the floating material will be trapped in the cylinder. The floating material can be collected by the repeated lifting of the filter sleeve 1601, and the final purification is realized.

[0039] The embodiments of the application are described in detail above with reference to the drawings, but the application is not limited thereto, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A multi-stage sedimentation sludge granulation selection device, characterized by, The utility model relates to a sludge separation and selection device, including: A separation cylinder (1) is provided with a through slot in the center and a ring type selection cavity in the outer periphery; The selection cavity is divided into multiple equal size hierarchical selection rooms by a sludge scraping partition (2), the bottom of the selection cavity is provided with a rotating ring frame (7) coaxial with the selection cavity and sealed rotation, and the top is provided with a cylinder cover; The rotating ring frame (7) is provided with a sludge outlet pipe (9) communicating with the hierarchical selection rooms, and is in sealed sliding connection with the sludge scraping partition (2); The cylinder cover is provided with a group of water inlet pipes (3), multiple groups of transfer pipes one (5) and a group of transfer pipes two (4); A group of water inlet pipes (3) and a group of transfer pipes two (4) are respectively located on two adjacent groups of hierarchical selection rooms; Multiple groups of transfer pipes one (5) are located between the remaining two adjacent groups of hierarchical selection rooms; A filter cylinder (6) is located in the through slot of the separation cylinder (1), water is fed into the top through the transfer pipe two (4), water is discharged from the bottom through the water outlet pipe (8), and a filter (16) is arranged inside; And a selection assembly is arranged in the hierarchical selection room one by one, including a shear force generating part (12) arranged in pairs and lifted on both sides of the hierarchical selection room, an adjusting part (10) located between the cylinder cover and the rotating ring frame (7), and a connecting part (11) adjusted by the adjusting part (10) to drive the shear force generating parts (12) on both sides to move up and down alternately; The settling selection pressure is controlled by arranging the multiple groups of hierarchical selection rooms in equal difference shortening of the settling time along the water flow direction; The hierarchical selection room is arranged in a fan shape; The adjusting part (10) is located in the middle of the hierarchical selection room; The shear force generating part (12) is mirror image arranged on both sides of the adjusting part (10); The sludge scraping partition (2) is arranged on both sides of the sludge outlet pipe (9) by sliding to scrape up the sludge.

2. The multi-stage settling sludge granulation selection device according to claim 1, characterized by The connecting part (11) is a connecting chain, the connecting chain is limited to form a V-shaped structure by the adjusting part (10), and the length of the connecting chain on both sides is adjusted by the adjusting part (10), so that the shear force generating part (12) on the corresponding side moves reversely up and down.

3. The multi-stage settling sludge granulation selection device according to claim 2, characterized by The adjusting part (10) includes two groups of mounting frames (1001) located on the separation cylinder (1); The two groups of mounting frames (1001) extend to above the sludge outlet pipe (9), and two groups of adjusting rollers (1002) are arranged between the two groups of mounting frames (1001) and rotate relative to each other; The connecting chain is located between the two groups of adjusting rollers (1002) and moves synchronously in a V-shaped manner with the rotation of the adjusting rollers (1002).

4. The multi-stage settling sludge granulation selection device according to claim 2, characterized by The shear force generating part (12) includes a shear force generating frame (1201) connected with the connecting chain and slidingly arranged on the sludge scraping partition (2); The shear force generating frame (1201) is arranged in a frame body structure, is in sliding connection with the inner wall of the selection room, and is provided with an aeration head (1202) connected with an external aeration equipment; The sludge scraping partition (2) is provided with a guide part guiding the shear force generating frame (1201).

5. The multi-stage settling sludge granulation selection device according to claim 4, characterized by The shear force generating frame (1201) is arranged in a half-fan-shaped frame body matched with the shape of the hierarchical selection room; The connecting chain is connected to the inner wall of the half-fan-shaped frame body; The aeration head (1202) is arranged on the inner wall of the half-fan-shaped frame body; The adjusting part (10) is arranged in the middle position inside the two groups of shear force generating frames (1201) which are mirror images and are spliced into a complete fan shape.

6. The multi-stage settling sludge granulation selection device according to claim 4, characterized by The guide comprises a guide rail (1203) on the mud scraping partition (2); the end of the guide rail (1203) is provided with a limiting frame (1204); The shearing force generating frame (1201) is provided with a sliding groove matched with the guide rail (1203), and the shearing force generating frame (1201) and the limiting frame (1204) are provided with an elastic pulling member (1205); Under the action of the elastic pulling member (1205), the shearing force generating frame (1201) maintains the tendency of upward movement.

7. The multi-stage settling sludge granulation selection device according to claim 1, characterized by The filtering member (16) comprises a filtering sleeve (1601) installed in the filtering cylinder (6) through a telescopic base (1603); the filtering sleeve (1601) is provided with a filtering screen (1602) on the cylinder wall; The filtering sleeve (1601) moves up and down at the liquid level position; The water outlet pipe (8) is located at the bottom of the filtering sleeve (1601).

8. The multi-stage settling sludge granulation selection device according to claim 1, characterized by, The bottom of the filtering cylinder (6) is provided with a driving cover (15) connected with the rotating ring frame (7) and rotatable; the driving cover (15) surrounds the water outlet pipe (8), and the inner wall is provided with a gear ring (14); the bottom of the filtering cylinder (6) is further provided with a rotating gear (13); the gear (13) is engaged with the gear ring (14) to drive the driving cover (15) and the rotating ring frame (7) to rotate.

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