Multi-stage precipitation type sludge granulation selection device

Abstract

The invention relates to the field of sewage treatment equipment, in particular to a multi-stage precipitation type sludge granulation selection device. The device comprises a separation cylinder, a filter cylinder and a selection assembly. The separation cylinder is provided with a circle of annular selection cavity; a rotary ring frame is arranged at the bottom of the selection cavity, and a cylinder cover is arranged at the top of the selection cavity; the rotating ring frame is in sealed sliding connection with the mud scraping partition plate. The filter cylinder is located in the separation cylinder. The selection assemblies are arranged in the grading selection chambers in a one-to-one correspondence mode and comprise shear force generating pieces, adjusting pieces and connecting pieces. On one hand, the settling selection pressure of different grading selection chambers is controlled by sequentially setting equidifferently-shortened settling time, on the other hand, hydraulic shearing force is applied to scraped sludge through cooperation of the sludge scraping partition plates and the selection assemblies, the multi-stage settling type sludge granulation selection modes are diversified, and sewage treatment is flexible and efficient.

Description

Technical Field

[0001] The present invention relates to the field of sewage treatment equipment, and in particular to a multi-stage sedimentation type sludge granulation selection device. Background Art

[0002] Sludge granulation is a key technical strategy in wastewater treatment. Granular sludge has a much higher settling rate than flocculent sludge, effectively reducing sludge loss and maintaining a high biomass concentration within the reactor. This is crucial for improving wastewater treatment efficiency and reducing the burden of subsequent treatment. Granular sludge forms a microecosystem within the granules, where different populations of microorganisms (such as acidogens and methanogens) are 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. Granular sludge's large surface area allows for more complete contact between microorganisms and the substrate, thereby increasing the degradation rate of organic matter and gas production efficiency. Furthermore, the formation of granular sludge helps shorten the diffusion distance of fermentation intermediates, promoting the degradation of complex organic matter. Granular sludge can withstand higher volumetric and hydraulic loads of organic matter, enabling reactors to maintain efficient operation even under high load conditions. This is of great significance for treating high-concentration organic wastewater.

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

[0004] The aforementioned sludge granulation selection device selects sludge through peripheral water inlet and central water outlet. The sludge selected can only be classified into two types: heavy sludge particles and light sludge flocs. This not only provides a single sludge grade classification but also lacks a design to promote sludge granulation. It relies solely on sedimentation selection pressure to promote sludge granulation, resulting in unreliable sludge granulation and limited sewage treatment effectiveness. Summary of the Invention

[0005] In response to the problems existing in the background technology, a multi-stage sedimentation sludge granulation selection device is proposed. On the one hand, the sedimentation selection pressure of different graded selection chambers is controlled by successively setting the sedimentation time with equal differences. On the other hand, the scraping baffle and the selection component are combined to apply hydraulic shear force to the scraped sludge. The multi-stage sedimentation sludge granulation selection mode is diverse, and the sewage treatment is flexible and efficient.

[0006] The present invention proposes a multi-stage sedimentation type sludge granulation selection device, comprising a separation cylinder, a filter cylinder, and a selection assembly. A through groove is provided in the center of the separation cylinder, and a ring-shaped selection cavity is provided on the outer periphery. The selection cavity is divided into a plurality of equal-sized graded selection chambers by a sludge scraper baffle. A rotating ring frame is provided at the bottom of the selection chamber, which is coaxial with the sludge scraper baffle and rotates in a sealed manner. A cylinder cover is provided at the top. A sludge outlet pipe connected to the graded selection chamber is provided on the rotating ring frame, and is also in sealed sliding connection with the sludge scraper baffle. A set of water inlet pipes, multiple groups of transfer pipes 1, and a set of transfer pipes 2 are provided on the cylinder cover. One set of water inlet pipes and one set of transfer pipes 2 are respectively located on two adjacent groups of graded selection chambers. Multiple groups of transfer pipes 1 are located between the remaining two adjacent groups of graded selection chambers. The filter cylinder is located in the through groove of the separation cylinder, with water entering through transfer pipe 2 at the top and exiting through the water outlet pipe at the bottom. A filter element is provided inside. The selection components are arranged one by one in the graded selection chamber, including shear force generating parts that are arranged in pairs and lifted on both sides of the graded selection chamber, an adjusting part located between the cylinder cover and the rotating ring frame, and a connecting part that is adjusted by the adjusting part to drive the shear force generating parts on both sides to rise and fall alternately.

[0007] Preferably, the sedimentation selection pressure is controlled by sequentially setting equidistantly shortened sedimentation times along the water flow direction through multiple groups of graded selection chambers.

[0008] Preferably, the grading and selection chamber is arranged in a fan shape; the adjusting member is located in the middle of the grading and selection chamber; the shear force generating members are arranged in a mirror image on both sides of the adjusting member; and the scraping baffles are slidably arranged on both sides of the mud outlet pipe to scrape up the sludge.

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

[0010] Preferably, the adjusting member includes two sets of mounting frames located on the separation cylinder; the two sets of mounting frames are extended to the top of the mud outlet pipe, and two sets of relatively rotating adjusting rollers are arranged between the two sets of mounting frames; the connecting chain is located between the two sets of adjusting rollers and moves synchronously in a V shape with the rotation of the adjusting rollers.

[0011] Preferably, the shear force generating member includes a shear force generating frame connected to a connecting chain and slidingly arranged on the scraper baffle; the shear force generating frame is arranged as a frame structure, which is slidingly connected to the inner wall of the selected chamber and is provided with an aeration head connected to an external aeration device; a guide member is provided on the scraper baffle to guide the shear force generating frame.

[0012] Preferably, the shear force generating frame is configured as a semi-fan-shaped frame that matches the shape of the grading selection chamber; the connecting chain is connected to the inner wall of the semi-fan-shaped frame; the aeration head is arranged on the inner wall of the semi-fan-shaped frame; and the adjusting member is arranged in the middle position inside two sets of shear force generating frames that are mirrored and spliced ​​into a complete fan shape.

[0013] Preferably, the guide member includes a guide rail located on the scraper baffle; a limit frame is provided at the end of the guide rail; a slide groove cooperating with the guide rail is provided on the shear force generating frame, and an elastic pulling member is provided between the shear force generating frame and the limit frame; under the action of the elastic pulling member, the shear force generating frame maintains an upward movement trend.

[0014] Preferably, the filter element comprises a filter sleeve mounted in the filter cartridge via a telescopic base; a filter screen is provided on the filter sleeve wall; the filter sleeve moves up and down at the liquid level; and the water outlet pipe is located at the bottom of the filter sleeve.

[0015] Preferably, a rotatable drive cover connected to a rotating ring frame is provided at the bottom of the filter cartridge; the drive cover surrounds the water outlet pipe, and a gear ring is provided on the inner wall; a rotating gear is also provided at the bottom of the filter cartridge; the gear is engaged with the gear ring to drive the drive cover and the rotating ring frame to rotate.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: a plurality of independent and interconnected grading selection chambers are set to form a multi-stage sedimentation path. During the sewage movement process, on the one hand, the sedimentation selection pressure of different grading selection chambers is controlled by successively setting equidistantly shortened sedimentation times; on the other hand, the scraping baffle and the selection component are coordinated to apply hydraulic shear force to the scraped sludge, thereby realizing multi-stage sedimentation sludge granulation.

[0017] The selection component uses the shear force-generating frame to move up and down, cleaning the sludge adhering to the inner walls of the graded selection chamber while applying hydraulic shear to the bottom sludge scraped up by the scraper baffle. This hydraulic shear force is generated by aeration from the aeration head and agitation of the water flow through its up and down movement. Hydraulic shear force, generated by controlling aeration intensity or mechanical agitation, combined with sedimentation selection pressure, encourages microorganisms in the sludge to secrete sticky EPS, eliminating loose flocs and ultimately building a granular "skeleton" of the corresponding grade. The rotating ring frame drives the scraper baffle to slide, not only scraping off the sludge but also discharging the graded sludge particles. Multi-stage sedimentation sludge granulation offers a variety of options, enabling flexible and efficient wastewater treatment.

[0018] In addition, the sewage is finally discharged into the filter sleeve, which moves up and down at the liquid level to collect floating objects, thus achieving comprehensive and efficient sewage treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a top view of a multi-stage sedimentation sludge granulation selection device; Figure 2 This is a bottom view of the multi-stage sedimentation sludge granulation selection device; Figure 3 This is the internal structure diagram of the multi-stage sedimentation sludge granulation selection device; Figure 4 for Figure 3 Cross-sectional view (view point 1); Figure 5 for Figure 3 Cross-sectional view (view 2); Figure 6 It is the structural diagram of the shear force generating component; Figure 7 It is a structural diagram of the filter cartridge and filter element; Figure 8 for Figure 5 Enlarged view of point A in the middle.

[0020] Figure markings: 1. separation cylinder; 2. scraper baffle; 3. water inlet pipe; 4. transfer pipe 2; 5. transfer pipe 1; 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. limit frame; 1205. elastic pulling part; 13. gear; 14. gear ring; 15. drive cover; 16. filter element; 1601. filter sleeve; 1602. filter screen; 1603. telescopic base. DETAILED DESCRIPTION

[0021] Example 1: This example proposes a multi-stage sedimentation sludge granulation selection device, such as Figure 1-Figure 5As shown, it includes a separation cylinder 1, a filter cylinder 6 and a selection component. A through groove is provided in the center of the separation cylinder 1, and a ring-shaped selection cavity is provided on the periphery; the selection cavity is divided into a plurality of equal-sized graded selection chambers by the scraper baffle 2, and a rotating ring frame 7 coaxial with it and rotating in a sealed manner is provided at the bottom of the selection chamber, and a cylinder cover is provided on the top; a mud outlet pipe 9 connected to the graded selection chamber is provided on the rotating ring frame 7, and is also in sealed sliding connection with the scraper baffle 2; a group of water inlet pipes 3, multiple groups of transfer pipes 1 5 and a group of transfer pipes 2 4 are provided on the cylinder cover; a group of water inlet pipes 3 and a group of transfer pipes 2 4 are respectively located on two adjacent groups of graded selection chambers; multiple groups of transfer pipes 1 and 2 are respectively located on two adjacent groups of graded selection chambers; multiple groups of transfer pipes 2 and 3 are respectively located on two adjacent groups of graded selection chambers; multiple groups of transfer pipes 3 and 2 are respectively located on two adjacent groups of graded selection chambers; multiple groups of transfer pipes 4 are respectively located on two adjacent groups of graded selection chambers; multiple groups of transfer pipes 5 and 2 are respectively located on two adjacent groups of graded selection chambers. The group transfer pipe 5 is located between the remaining two adjacent groups of graded selection chambers; the filter cylinder 6 is located in the through groove of the separation cylinder 1, with water entering through the transfer pipe 2 4 at the top and discharging through the outlet pipe 8 at the bottom, and a filter element 16 is arranged inside; the selection components are arranged one by one in the graded selection chamber, including shear force generating parts 12 that are arranged in pairs and lifted on both sides of the graded selection chamber, an adjusting part 10 located between the cylinder cover and the rotating ring frame 7, and a connecting part 11 that is adjusted by the adjusting part 10 to drive the shear force generating parts 12 on both sides to rise and fall alternately.

[0022] It should be further explained that the sedimentation selection pressure is controlled by setting asymptotically shortened settling times in multiple sets of grading selection chambers along the water flow direction. For example, the settling times for three grading selection chambers can be set to 25 minutes, 15 minutes, and 5 minutes, respectively. Short settling times eliminate slow-settling flocs while retaining fast-settling particle precursors. By varying the settling times, particle precursors of different sizes can be screened and selected.

[0023] It should be further explained that the grading and selection chamber is fan-shaped; the adjustment member 10 is located in the center of the grading and selection chamber; the shear force generating elements 12 are arranged in a mirrored pattern on either side of the adjustment member 10; the sludge scraper baffles 2 slide on either side of the sludge outlet pipe 9 to scrape up the sludge. Before sewage treatment, the grading and selection chambers are inoculated with anaerobic or aerobic sludge. Aerobic sludge contains phosphate-accumulating organisms (PAOs), nitrifying bacteria (AOB / NOB), and denitrifying bacteria (DNB). Anaerobic sludge contains methanogens (Methanosaeta) and acid-producing bacteria. Sewage flows through each grading and selection chamber sequentially for particle precursor precipitation. After precipitation is complete, the rotating ring frame 7 rotates back and forth, and multiple sets of sludge scraper baffles 2 slide synchronously to scrape up the sludge deposited in each grading and selection chamber. The shear force generating elements 12 rise and fall, simultaneously generating hydraulic shear force by controlling the aeration intensity (for aerobic sludge) or by mechanical agitation (for both aerobic and anaerobic sludge). Under the action of hydraulic shear forces of varying intensities and sedimentation selection pressure, microorganisms in the sludge are encouraged to secrete sticky EPS, eliminating loose flocs and ultimately building a granular "skeleton" of corresponding grade. Finally, the scraper baffle 2 slides, pushing the sludge particles toward the sludge outlet pipe 9 for discharge.

[0024] like Figure 6As shown, the connecting member 11 is a connecting chain, which is limited by the adjusting member 10 to form a V-shaped structure, and the length of both sides is adjusted by the adjusting member 10, driving the shear force generating member 12 on the corresponding side to move up and down in opposite directions; the shear force generating member 12 is pulled up and down by the connecting chain, and aeration or mechanical stirring can be performed during the movement to form hydraulic shear force acting on the sludge particle precursor.

[0025] like Figure 6 As shown, the adjusting member 10 includes two sets of mounting brackets 1001 located on the separation drum 1; the two sets of mounting brackets 1001 extend above the mud discharge pipe 9, and two sets of adjusting rollers 1002 are arranged between the two sets of mounting brackets 1001, which are driven by a motor to rotate relative to each other; a connecting chain is located between the two sets of adjusting rollers 1002, and moves synchronously in a V-shape as the adjusting rollers 1002 rotate; to further improve the stability of the connecting chain, a gear structure can be provided on the adjusting rollers 1002, and the connecting chain and the gear structure are meshed. On the one hand, the connecting chain is limited by the two sets of adjusting rollers 1002, forming a V-shaped structure; on the other hand, the two sets of adjusting rollers 1002 rotate, driving the shear force generating members 12 on both sides to rise and fall in opposite directions.

[0026] like Figure 6 As shown, the shear force generating element 12 includes a shear force generating frame 1201 connected to a connecting chain and slidably mounted on the scraper baffle 2. The shear force generating frame 1201 is configured as a frame structure, slidably connected to the inner wall of the selection chamber and provided with an aeration head 1202 connected to an external aeration device. The scraper baffle 2 is provided with a guide member to guide the shear force generating frame 1201. The up and down movement of the shear force generating frame 1201 can not only clean the sludge attached to the wall of the graded selection chamber, but also apply hydraulic shear force to the bottom sludge scraped by the scraper baffle 2. The hydraulic shear force is generated by aeration by the aeration head 1202 and stirring of the water flow by the up and down movement.

[0027] It should be further explained that the shear force generating frame 1201 is configured as a semi-fan-shaped frame that matches the shape of the grading selection chamber; the connecting chain is connected to the inner wall of the semi-fan-shaped frame; the aeration head 1202 is configured on the inner wall of the semi-fan-shaped frame; the adjusting member 10 is configured in the middle position inside the two sets of shear force generating frames 1201 that are mirror images and spliced ​​into a complete fan shape; the shear force generating frame 1201 moves with the scraper baffle 2, which scrapes up the sludge sediment, and the two sets of shear force generating frames 1201 move up and down. The semi-fan-shaped frame provides an installation location for the aeration head 1202, while allowing aeration to have more variable directions and occupy less space. The adjusting member 10 is in the middle position inside the two sets of shear force generating frames 1201 and moves with the scraper baffle 2. It can not only adjust the position of the connecting chain, but also promote the movement of the sludge, further assisting in sludge granulation.

[0028] It should be further explained that the guide member includes a guide rail 1203 located on the scraper baffle 2; a limit frame 1204 is provided at the end of the guide rail 1203; a slide groove is provided on the shear force generating frame 1201 to cooperate with the guide rail 1203, and an elastic pull member 1205 is provided between the shear force generating frame 1201 and the limit frame 1204; under the action of the elastic pull member 1205, the shear force generating frame 1201 maintains an upward movement trend; when the shear force generating frame 1201 on one side is pulled downward, the shear force generating frame 1201 on the other side automatically moves upward. And so on, forming an alternating upward and downward movement trajectory. Sludge granulation is achieved during the movement.

[0029] like Figure 7 As shown, filter element 16 includes a filter sleeve 1601 mounted within filter cartridge 6 via a telescopic base 1603; a filter screen 1602 is disposed on the wall of filter sleeve 1601; filter sleeve 1601 moves up and down at the liquid level; outlet pipe 8 is located at the bottom of filter sleeve 1601; and transfer pipe 24 discharges wastewater after multi-stage sedimentation directly into filter sleeve 1601. By arranging filter sleeve 1601 to move up and down at the liquid level, downward movement presses the water surface, generating negative pressure that draws floating impurities into filter sleeve 1601. Upward movement drains the water from the cartridge, trapping floating impurities within. Repeated raising and lowering of filter sleeve 1601 collects floating impurities, achieving ultimate purification.

[0030] like Figure 8 As shown, a rotatable drive cover 15 connected to the rotating ring frame 7 is provided at the bottom of the filter cartridge 6; the drive cover 15 surrounds the water outlet pipe 8, and a gear ring 14 is provided on the inner wall; a gear 13 driven to rotate by a motor is also provided at the bottom of the filter cartridge 6; the gear 13 is engaged with the gear ring 14 to drive the drive cover 15 and the rotating ring frame 7 to rotate; the movement of the scraper baffle 2 is realized by the rotation of the rotating ring frame 7.

[0031] Example 2, based on the multi-stage sedimentation sludge granulation and selection device described in Example 1, proposes a multi-stage sedimentation sludge granulation and selection method. The specific steps are as follows: Before sewage treatment, anaerobic or aerobic sludge is inoculated into the grading and selection chambers based on the sewage composition. Sewage then enters the first-stage grading and selection chamber from the inlet pipe 3 for sedimentation, which lasts for 25 minutes. The sewage then passes through multiple sets of transfer pipes 5, sequentially through the second and third-stage grading and selection chambers, with sedimentation times of 15 minutes and 5 minutes, respectively. During this sedimentation process, the rotating ring frame 7 rotates back and forth, while multiple sets of scraper baffles 2 slide synchronously, scraping the sludge deposited in each grading and selection chamber. A connecting chain rotates through two sets of adjustment rollers 1002, driving the shear force generating elements 12 on both sides to rise and fall in opposite directions. The up and down movement of the shear force generating frame 1201 not only cleans sludge adhering to the inner walls of the grading and selection chambers, but also applies hydraulic shear force to the bottom sludge scraped by the scraper baffles 2. Hydraulic shear force is generated by aeration and water agitation through the aeration head 1202's vertical movement. Hydraulic shear force, generated by controlling aeration intensity (for aerobic sludge) or mechanical agitation (for aerobic and anaerobic sludge), combined with sedimentation selection pressure, encourages microorganisms in the sludge to secrete sticky EPS, eliminating loose flocs and ultimately building a granular "skeleton" of the corresponding grade. Finally, the sliding sludge scraper 2 pushes the sludge particles toward the sludge outlet pipe 9 for discharge. After multi-stage sedimentation-based sludge granulation, the wastewater is discharged through transfer pipe 24 into the filter sleeve 1601. The filter sleeve 1601 moves up and down at the liquid level. Downward movement presses the water surface, generating negative pressure that draws floating impurities into the filter sleeve 1601. Upward movement drains the water from the sleeve, trapping floating impurities within. Repeated raising and lowering of the filter sleeve 1601 collects floating impurities, achieving final purification.

[0032] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A multi-stage sedimentation sludge granulation selection device, characterized in that: include: A separation cylinder (1), wherein a through groove is provided in the center of the separation cylinder (1) and an annular selection cavity is provided on the periphery; The selection chamber is divided into a plurality of equal-sized graded selection chambers by the scraper baffle (2); a rotating ring frame (7) coaxial with the selection chamber and rotating in a sealed manner is provided at the bottom of the selection chamber, and a cylinder cover is provided at the top; a mud outlet pipe (9) communicating with the graded selection chamber is provided on the rotating ring frame (7), and is also in sealed sliding connection with the scraper baffle (2); a group of water inlet pipes (3), a plurality of transfer pipes (1) and a group of transfer pipes (4) are provided on the cylinder cover; a group of water inlet pipes (3) and a group of transfer pipes (2) are respectively located on two adjacent groups of graded selection chambers; and a plurality of transfer pipes (1) are located between the remaining two adjacent groups of graded selection chambers; The filter cartridge (6) is located in the through groove of the separation cartridge (1), with water entering through the transfer pipe 2 (4) at the top and water exiting through the outlet pipe (8) at the bottom, and a filter element (16) is provided inside; And a selection component, the selection component is arranged in a one-to-one correspondence in the graded selection chamber, including shear force generating members (12) arranged in pairs and lifted on both sides of the graded selection chamber, an adjusting member (10) located between the cylinder cover and the rotating ring frame (7), and a connecting member (11) that is adjusted by the adjusting member (10) to drive the shear force generating members (12) on both sides to lift up and down alternately.

2. The multi-stage sedimentation sludge granulation selection device according to claim 1, characterized in that: The sedimentation selection pressure is controlled by sequentially setting equidistantly shortened sedimentation times along the water flow direction through multiple groups of graded selection chambers.

3. The multi-stage sedimentation sludge granulation selection device according to claim 1, characterized in that: The graded selection room is arranged in a sector shape; The regulating member (10) is located in the middle of the grading and selection chamber; The shear force generating member (12) is arranged in a mirror image on both sides of the adjusting member (10); The scraping baffles (2) are slidably arranged on both sides of the mud outlet pipe (9) to scrape up the sludge.

4. The multi-stage sedimentation sludge granulation selection device according to claim 3, characterized in that: The connecting member (11) is a connecting chain, which is limited by the adjusting member (10) to form a V-shaped structure, and the length of both sides is adjusted by the adjusting member (10), thereby driving the shear force generating member (12) on the corresponding side to move up and down in opposite directions.

5. The multi-stage sedimentation sludge granulation selection device according to claim 4, characterized in that: The adjusting member (10) comprises two sets of mounting frames (1001) located on the separation cylinder (1); the two sets of mounting frames (1001) are extended to above the mud discharge pipe (9), and two sets of relatively rotating adjusting rollers (1002) are arranged between the two sets of mounting frames (1001); The connecting chain is located between the two sets of adjusting rollers (1002) and moves synchronously in a V-shape as the adjusting rollers (1002) rotate.

6. The multi-stage sedimentation sludge granulation selection device according to claim 4, characterized in that: The shear force generating member (12) comprises a shear force generating frame (1201) connected to the connecting chain and slidably arranged on the mud scraping baffle (2); The shear force generating frame (1201) is provided as a frame structure, and is slidably connected to the interior wall of the selected room, while an aeration head (1202) connected to an external aeration device is provided; A guide member for guiding the shear force generating frame (1201) is provided on the scraper baffle (2).

7. The multi-stage sedimentation sludge granulation selection device according to claim 6, characterized in that: The shear force generating frame (1201) is configured as a semi-fan-shaped frame that matches the shape of the grading selection chamber; The connecting chain is connected to the inner wall of the semi-fan-shaped frame; The aeration head (1202) is arranged on the inner wall of the semi-fan-shaped frame; The regulating member (10) is arranged at a middle position inside two sets of shear force generating frames (1201) that are mirror images and spliced ​​together to form a complete fan shape.

8. The multi-stage sedimentation sludge granulation selection device according to claim 6, characterized in that: The guide member comprises a guide rail (1203) located on the mud scraping baffle (2); a limit frame (1204) is provided at the end of the guide rail (1203); A slide groove cooperating with the guide rail (1203) is provided on the shear force generating frame (1201), and an elastic pulling member (1205) is provided between the shear force generating frame (1201) and the limiting frame (1204); Under the action of the elastic pulling member (1205), the shear force generating frame (1201) maintains an upward movement trend.

9. The multi-stage sedimentation sludge granulation selection device according to claim 1, characterized in that: The filter element (16) comprises a filter sleeve (1601) mounted in the filter cartridge (6) via a telescopic base (1603); a filter screen (1602) is provided on the cartridge wall of the filter sleeve (1601); The filter sleeve (1601) moves up and down at the liquid level; The water outlet pipe (8) is located at the bottom of the filter sleeve (1601).

10. The multi-stage sedimentation sludge granulation selection device according to claim 1, characterized in that: A rotatable drive cover (15) connected to the rotating ring frame (7) is provided at the bottom of the filter cartridge (6); the drive cover (15) surrounds the water outlet pipe (8), and a gear ring (14) is provided on the inner wall; a rotating gear (13) is also provided at the bottom of the filter cartridge (6); the gear (13) is engaged with the gear ring (14), driving the drive cover (15) and the rotating ring frame (7) to rotate.

Images