CN220034208U - Radial flow type secondary sedimentation tank capable of screening aerobic granular sludge - Google Patents
Radial flow type secondary sedimentation tank capable of screening aerobic granular sludge Download PDFInfo
- Publication number
- CN220034208U CN220034208U CN202320655999.8U CN202320655999U CN220034208U CN 220034208 U CN220034208 U CN 220034208U CN 202320655999 U CN202320655999 U CN 202320655999U CN 220034208 U CN220034208 U CN 220034208U
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- sludge
- sedimentation tank
- secondary sedimentation
- mud
- pipe
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- 239000010802 sludge Substances 0.000 title claims abstract description 196
- 238000004062 sedimentation Methods 0.000 title claims abstract description 117
- 238000012216 screening Methods 0.000 title claims abstract description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 15
- 239000010935 stainless steel Substances 0.000 claims description 15
- 238000007599 discharging Methods 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 17
- 239000010865 sewage Substances 0.000 abstract description 11
- 239000002245 particle Substances 0.000 abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000007790 scraping Methods 0.000 description 5
- 230000002093 peripheral effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The utility model discloses a radial flow type secondary sedimentation tank capable of screening aerobic granular sludge, which relates to the technical field of sewage treatment and comprises a secondary sedimentation tank central cylinder, a residual sludge collecting well and a secondary sedimentation tank body, wherein a sludge collecting device is arranged at the bottom of the secondary sedimentation tank body, an annular sludge collecting groove is arranged at the top of the outer side of the secondary sedimentation tank central cylinder, and a sludge scraper is arranged in the secondary sedimentation tank body, and the beneficial effects of the utility model are that: the sedimentation tank can carry out selective separation to sedimentation sludge according to the size of sludge particles, large sludge particles are precipitated at the bottom of the tank around the water inlet of the central cylinder, light floccule sludge is precipitated at the bottom near the tank wall of the secondary sedimentation tank far away from the water inlet, and separated particle sludge and light floccule sludge can be discharged from a bottom sludge discharge port and a top sludge discharge groove respectively, so that selective separation of aerobic particle sludge is realized. The long-term operation of the secondary sedimentation tank can continuously eliminate flocculent sludge in the biochemical tank, increase the concentration of aerobic granular sludge, and increase the surface load of the secondary sedimentation tank and the treatment capacity of a sewage plant.
Description
Technical Field
The utility model relates to the technical field of sewage treatment, in particular to a radial flow type secondary sedimentation tank capable of screening aerobic granular sludge.
Background
The secondary sedimentation tank is an important component of an activated sludge system of a sewage treatment plant, and is used for clarifying mixed liquor of the aerobic tank and concentrating the activated sludge. The secondary sedimentation tank is often divided into a horizontal sedimentation tank, a vertical sedimentation tank and a radial sedimentation tank according to different water flow directions in the tank. Wherein, a radial flow sedimentation tank is adopted for a large sewage treatment plant. The radial sedimentation tank is round, water enters from the center and water flows out from the periphery. The water inlet pipe of the radial flow sedimentation tank with water inlet at the center is suspended under a bridge or buried in concrete of a bottom plate of the tank body, sewage firstly enters into a central pipe of the tank body, and water flow is uniformly radiated to the periphery in the tank in the horizontal direction after being rectified by a rectifying plate around the central pipe. The supernatant overflows through an effluent weir arranged on the peripheral tank wall of the sedimentation tank, the sludge is settled to the bottom of the tank, the bottom of the tank is inclined towards the center, the sludge is scraped to a sludge collecting hopper in the center of the sedimentation tank by a sludge scraping and sucking machine, and then the sludge is sucked and discharged by gravity or a pump.
In the sedimentation tank, due to different sedimentation performances of sludge, the sedimentation speed of granular sludge with good sedimentation performance is high, and the granular sludge is easy to be settled on one side of a central cylinder of the water inlet of the sedimentation tank. And the flocculent sludge with poor sedimentation performance and light mass has low sedimentation speed, and more flocculent sludge is settled on one side of the bottom of the peripheral tank wall of the sedimentation tank. Generally, for a radial flow sedimentation tank in operation, the sedimentation of sludge is more at the bottom of the tank around the central water inlet pipe, and less at the bottom of the tank on one side of the tank wall.
The common secondary sedimentation tank and the sludge discharge equipment thereof discharge mixed sludge, namely, granular sludge and common flocculent sludge are mixed together for backflow or discharge, effective screening is not carried out, and part of granular sludge is discharged into residual sludge for elimination. The flocculent sludge in the secondary sedimentation tank is more, the sedimentation speed of the activated sludge is low, the sludge is easy to float upwards and the quality of the factory water exceeds the standard, and some sewage treatment plants adopt a hydrocyclone arranged behind the secondary sedimentation tank to separate the flocculent sludge and the granular sludge, but the energy consumption of the hydrocyclone is too high and the economy is poor.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a radial flow type secondary sedimentation tank capable of screening aerobic granular sludge, and solves the problems in the prior art.
In order to achieve the above purpose, the utility model is realized by the following technical scheme: the radial flow type secondary sedimentation tank capable of screening aerobic granular sludge comprises a secondary sedimentation tank central cylinder, a residual sludge collecting well, a sludge pump and a secondary sedimentation tank body, wherein a sludge collecting device is arranged at the bottom of the secondary sedimentation tank body, an annular sludge collecting groove is formed in the top of the outer side of the secondary sedimentation tank central cylinder, and a sludge scraper is arranged in the secondary sedimentation tank body;
the sludge suction pipe is characterized in that a sludge suction pipe orifice is arranged in the secondary sedimentation tank body, a sludge submersible pump is fixedly arranged in the sludge scraper, a sludge suction pipe body is fixedly arranged at the input end and the output end of the sludge submersible pump, the other end of the sludge suction pipe body at the input end of the sludge submersible pump is communicated with the sludge suction pipe orifice, an elbow is fixedly arranged at the other end of the sludge suction pipe body at the output end of the sludge submersible pump, the sludge suction pipe body at the output end of the sludge submersible pump extends out of the water surface of the secondary sedimentation tank body and is connected with the elbow, a horizontal sludge discharge pipe is fixedly arranged on the sludge suction pipe body through the elbow, and the horizontal sludge discharge pipe is positioned in the annular sludge collection groove;
one side of the annular sludge collecting groove is fixedly provided with a sludge outlet pipe, and one end of the sludge outlet pipe is communicated with the residual sludge collecting well.
Preferably, one side of the sludge pump is provided with a first sludge discharge pipe, a second sludge discharge pipe is fixedly arranged on the outer side of the first sludge discharge pipe, one end, far away from the sludge pump, of the first sludge discharge pipe is provided with a sludge storage tank, and one end, far away from the first sludge discharge pipe, of the second sludge discharge pipe is connected with an anaerobic tank.
Preferably, a valve is arranged at one end of the second sludge discharge pipe close to the first sludge discharge pipe, so that the opening and closing of the second sludge discharge pipe can be controlled conveniently.
Preferably, the mud collecting device is an annular mud collecting ditch, the annular mud collecting ditch is arranged below the secondary sedimentation tank body, the annular mud collecting ditch is arranged at the position with the radius of 0.8R of the secondary sedimentation tank body, 1/3 of the sedimentation area of the secondary sedimentation tank is arranged outside the annular mud collecting ditch, and 2/3 of the sedimentation area is arranged in the annular mud collecting ditch. The setting position of the annular sludge collecting ditch can be set according to the property of the local activated sludge. The width of the annular mud collecting ditch can be set to be about 30cm-50cm according to the diameter of the secondary sedimentation tank body, and the depth is about 15cm-20 cm.
Preferably, the mud collecting device is an L-shaped stainless steel baffle plate, the L-shaped stainless steel baffle plate is fixedly arranged at the bottom of the inner wall of the secondary sedimentation tank body, the L-shaped stainless steel baffle plate is fixed on the concrete of the bottom plate of the secondary sedimentation tank body by adopting expansion bolts, the L-shaped stainless steel baffle plate extends out of the bottom of the tank by about 15cm-20, a mud scraping plate outside the mud scraping machine scrapes flocculent mud with small grain size to be accumulated near the L-shaped stainless steel baffle plate, and the flocculent mud is pumped out into an annular mud collecting groove at the top of the tank by a mud suction pipe orifice.
The utility model provides a radial flow secondary sedimentation tank capable of screening aerobic granular sludge, which has the following beneficial effects:
according to the radial flow type secondary sedimentation tank capable of screening aerobic granular sludge, a sludge collecting groove is additionally arranged in the radial flow type secondary sedimentation tank, a sludge collecting groove is formed in the top of a central cylinder, flocculent sludge with small bottom grain size is discharged to a surplus sludge treatment system through a sludge suction system arranged on a sludge scraper frame, and aerobic granular sludge with large grain size is reserved for backflow. According to the sedimentation tank disclosed by the utility model, the sedimentation sludge can be selectively separated according to the size of sludge particles, large sludge particles are precipitated at the bottom of the tank around the water inlet of the central cylinder, light floccule sludge is precipitated at the bottom near the tank wall of the secondary sedimentation tank far away from the water inlet, and the separated granular sludge and light floccule sludge can be respectively discharged from a bottom sludge discharge port and a top sludge discharge groove, so that the selective separation of aerobic granular sludge is realized. The long-term operation of the secondary sedimentation tank can continuously eliminate flocculent sludge in the biochemical tank, increase the concentration of aerobic granular sludge and accelerate the sludge sedimentation speed in the secondary sedimentation tank. And simultaneously, the surface load of the secondary sedimentation tank and the treatment capacity of a sewage plant are increased.
Drawings
FIG. 1 is a schematic cross-sectional view of the present utility model;
FIG. 2 is a top view of the present utility model;
fig. 3 is a schematic view of another view of the present utility model.
In the figure: 1. an annular mud collecting ditch; 2. an annular mud collecting groove; 3. a mud scraper; 4. a mud suction pipe orifice; 5. a mud suction pipe body; 6. a submersible sewage pump; 7. an elbow; 8. a horizontal sludge discharge pipe; 9. a secondary sedimentation tank central cylinder; 10. a mud outlet pipe; 11. a residual sludge collecting well; 12. a sludge pump; 13. a first sludge discharge pipe; 14. a mud storage pool; 15. a second sludge discharge pipe; 16. an anaerobic tank; 17. an L-shaped stainless steel baffle plate; 18. a secondary sedimentation tank body.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
Referring to fig. 1 to 3, the present utility model provides the following technical solutions:
embodiment one:
the radial flow type secondary sedimentation tank capable of screening aerobic granular sludge comprises a secondary sedimentation tank central cylinder 9, a residual sludge collecting well 11, a sludge pump 12 and a secondary sedimentation tank body 18, wherein a sludge collecting device is arranged at the bottom of the secondary sedimentation tank body 18, the sludge collecting device is an annular sludge collecting ditch 1, the annular sludge collecting ditch 1 is arranged below the secondary sedimentation tank body 18, the annular sludge collecting ditch 1 is arranged at the position of the radius 0.8R of the secondary sedimentation tank body 18, a secondary sedimentation tank 1/3 sedimentation area is arranged outside the annular sludge collecting ditch 1, and a sedimentation area of 2/3 is arranged in the annular sludge collecting ditch 1. The installation position of the annular sludge collection ditch 1 can be set according to the nature of the local activated sludge. The width of the annular mud collecting groove 1 can be set to be about 30cm-50cm according to the diameter of the secondary sedimentation tank body 18, the depth is about 15cm-20cm, the annular mud collecting groove 2 is arranged at the top of the outer side of the secondary sedimentation tank central cylinder 9, and a mud scraper 3 is arranged in the secondary sedimentation tank body 18; the inside of the secondary sedimentation tank body 18 is provided with a sludge suction pipe orifice 4, the inside of the sludge scraper 3 is fixedly provided with a sludge submersible pump 6, the input end and the output end of the sludge submersible pump 6 are fixedly provided with a sludge suction pipe body 5, the other end of the sludge submersible pump 6, which is connected with the sludge suction pipe orifice 4, is communicated with the sludge suction pipe orifice 5, the other end of the sludge submersible pump 6, which is connected with an elbow 7, is fixedly provided with a sludge suction pipe body 5 at the output end of the sludge submersible pump 6, which extends out of the water surface of the secondary sedimentation tank body 18 and is connected with the elbow 7, the sludge suction pipe body 5 is fixedly provided with a horizontal sludge discharge pipe 8 through the elbow 7, and the horizontal sludge discharge pipe 8 is positioned inside the annular sludge collection tank 2; one side fixed mounting of annular album mud groove 2 has out mud pipe 10, go out the one end of mud pipe 10 and the intercommunication of surplus mud album mud well 11, one side of sludge pump 12 is provided with first mud pipe 13, the outside fixed mounting of first mud pipe 13 has second mud pipe 15, the one end that first mud pipe 13 kept away from sludge pump 12 is provided with the storage pond 14, the one end that second mud pipe 15 kept away from first mud pipe 13 is connected with anaerobic tank 16, the one end that second mud pipe 15 is close to first mud pipe 13 is provided with the valve, the opening and closing of second mud pipe 15 of being convenient for control.
Embodiment two, unlike embodiment one, is:
the mud collecting device is an L-shaped stainless steel baffle 17, the L-shaped stainless steel baffle 17 is fixedly arranged at the bottom of the inner wall of the secondary sedimentation tank body 18, the L-shaped stainless steel baffle 17 is fixed on the concrete of the bottom plate of the secondary sedimentation tank body 18 by adopting expansion bolts, the L-shaped stainless steel baffle 17 extends out of the bottom of the tank by about 15cm < -20 >, a mud scraping plate on the outer side of the mud scraper 3 scrapes flocculent mud with small grain size to the vicinity of the L-shaped stainless steel baffle 17 to be accumulated, and the flocculent mud is pumped out into the stainless steel annular mud collecting groove 2 on the top of the tank by a mud sucking pipe orifice 4.
In conclusion, when the radial flow secondary sedimentation tank capable of screening aerobic granular sludge is used, the granular sludge is large in particle size and high in sedimentation speed, and generally sediments around a central cylinder 9 of the secondary sedimentation tank. And flocculent sludge has small particle size and slow sedimentation speed and is mostly precipitated near the wall of the secondary sedimentation tank 18. By utilizing the characteristics, the utility model screens the mixed sludge at the bottom of the sedimentation tank into two parts: 1. the aerobic granular sludge near the center cylinder 9 of the secondary sedimentation tank flows back to the anaerobic tank from the center sludge collecting hopper. 2. The flocculent sludge near the tank wall is sucked by the annular sludge collecting ditch 1 at the tank bottom to the sludge storage tank 14 of the sewage plant for dehydration and discharge. Specifically, the activated sludge mixed liquid at the tail of the aerobic tank is conveyed into a secondary sedimentation tank central cylinder 9 of a secondary sedimentation tank body, after sewage is rectified by a rectifying plate around the secondary sedimentation tank central cylinder 9, water flow radiates to the periphery in the secondary sedimentation tank in the horizontal direction, in the process of continuously slowing down the water flow speed, aerobic granular sludge with high sedimentation speed is firstly precipitated to the bottom of the tank near the secondary sedimentation tank central cylinder 9, and flocculent sludge with low sedimentation speed is precipitated to the bottom of the tank near the secondary sedimentation tank wall. The bottom of the secondary sedimentation tank is inclined towards the center, the mud scraper 3 slowly rotates, and flocculent mud with low sedimentation speed is scraped into the annular mud collecting ditch 1 by the peripheral mud scraping plates of the mud scraper 3. The inner mud scraper 3 scrapes the mud with high sedimentation speed into the center cylinder 9 of the secondary sedimentation tank. The mud suction pipe system 6 rotates slowly along with the mud scraper 3, and the mud suction pipe orifice 4 extending into the annular mud collecting ditch 1 sucks the mud in the ditch into the stainless steel annular mud collecting groove 2 on the top of the tank, and then the mud is collected into the residual mud collecting well 11 in the factory by the mud outlet pipe 10. The flocculent sludge of all secondary sedimentation tanks in the factory is totally gathered into a surplus sludge collecting well 11, and a sludge pump 12 in the surplus sludge collecting well 11 conveys the flocculent sludge to a sludge storage tank 14. The sludge in the secondary sedimentation tank central cylinder 9 flows back to the inlet end 16 of the biochemical system. Through the facilities, the utility model realizes effective screening of the activated sludge.
The foregoing is only a preferred embodiment of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art, who is within the scope of the present utility model, should make equivalent substitutions or modifications according to the technical scheme of the present utility model and the inventive concept thereof, and should be covered by the scope of the present utility model.
Claims (5)
1. The radial flow type secondary sedimentation tank capable of screening aerobic granular sludge comprises a secondary sedimentation tank central cylinder (9), a surplus sludge collecting well (11), a sludge pump (12) and a secondary sedimentation tank body (18), and is characterized in that: the bottom of the secondary sedimentation tank body (18) is provided with a mud collecting device, the top of the outer side of the secondary sedimentation tank central cylinder (9) is provided with an annular mud collecting groove (2), and the interior of the secondary sedimentation tank body (18) is provided with a mud scraper (3);
the sludge-sucking device is characterized in that a sludge sucking pipe orifice (4) is arranged in the secondary sedimentation tank body (18), a sludge submersible pump (6) is fixedly arranged in the sludge scraper (3), a sludge sucking pipe body (5) is fixedly arranged at the input end and the output end of the sludge submersible pump (6), the other end of the sludge sucking pipe body (5) at the input end of the sludge submersible pump (6) is communicated with the sludge sucking pipe orifice (4), an elbow (7) is fixedly arranged at the other end of the sludge sucking pipe body (5) at the output end of the sludge submersible pump (6), a horizontal sludge discharging pipe (8) is fixedly arranged on the sludge sucking pipe body (5) through the elbow (7), and the horizontal sludge discharging pipe (8) is positioned in the annular sludge collecting groove (2);
one side of the annular sludge collecting groove (2) is fixedly provided with a sludge outlet pipe (10), and one end of the sludge outlet pipe (10) is communicated with the residual sludge collecting well (11).
2. The radial flow secondary sedimentation tank capable of screening aerobic granular sludge according to claim 1, wherein: one side of the sludge pump (12) is provided with a first sludge discharge pipe (13), a second sludge discharge pipe (15) is fixedly arranged on the outer side of the first sludge discharge pipe (13), one end, far away from the sludge pump (12), of the first sludge discharge pipe (13) is provided with a sludge storage tank (14), and one end, far away from the first sludge discharge pipe (13), of the second sludge discharge pipe (15) is connected with an anaerobic tank (16).
3. The radial flow secondary sedimentation tank capable of screening aerobic granular sludge according to claim 2, wherein: and a valve is arranged at one end of the second sludge discharge pipe (15) close to the first sludge discharge pipe (13).
4. The radial flow secondary sedimentation tank capable of screening aerobic granular sludge according to claim 1, wherein: the mud collecting device is an annular mud collecting ditch (1), and the annular mud collecting ditch (1) is arranged below the secondary sedimentation tank body (18).
5. The radial flow secondary sedimentation tank capable of screening aerobic granular sludge according to claim 1, wherein: the mud collecting device is an L-shaped stainless steel baffle (17), and the L-shaped stainless steel baffle (17) is fixedly arranged at the bottom of the inner wall of the secondary sedimentation tank body (18).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320655999.8U CN220034208U (en) | 2023-03-29 | 2023-03-29 | Radial flow type secondary sedimentation tank capable of screening aerobic granular sludge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320655999.8U CN220034208U (en) | 2023-03-29 | 2023-03-29 | Radial flow type secondary sedimentation tank capable of screening aerobic granular sludge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220034208U true CN220034208U (en) | 2023-11-17 |
Family
ID=88743834
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320655999.8U Active CN220034208U (en) | 2023-03-29 | 2023-03-29 | Radial flow type secondary sedimentation tank capable of screening aerobic granular sludge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220034208U (en) |
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2023
- 2023-03-29 CN CN202320655999.8U patent/CN220034208U/en active Active
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