CN220432508U - Circulation MBR system - Google Patents
Circulation MBR system Download PDFInfo
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- CN220432508U CN220432508U CN202321689744.XU CN202321689744U CN220432508U CN 220432508 U CN220432508 U CN 220432508U CN 202321689744 U CN202321689744 U CN 202321689744U CN 220432508 U CN220432508 U CN 220432508U
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
- 239000012528 membrane Substances 0.000 claims abstract description 79
- 239000001301 oxygen Substances 0.000 claims abstract description 40
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 40
- 238000005273 aeration Methods 0.000 claims abstract description 37
- 238000000926 separation method Methods 0.000 claims abstract description 26
- 239000012510 hollow fiber Substances 0.000 claims abstract description 20
- 238000004062 sedimentation Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000005192 partition Methods 0.000 claims description 37
- 238000010992 reflux Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 15
- 238000005276 aerator Methods 0.000 claims description 9
- 238000000429 assembly Methods 0.000 claims description 9
- 230000000712 assembly Effects 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 230000001546 nitrifying effect Effects 0.000 claims description 8
- 239000010865 sewage Substances 0.000 abstract description 23
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 11
- 239000010802 sludge Substances 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 8
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 6
- 230000008021 deposition Effects 0.000 abstract description 5
- 229920006395 saturated elastomer Polymers 0.000 abstract description 4
- 238000005201 scrubbing Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005262 decarbonization Methods 0.000 abstract description 2
- 239000011259 mixed solution Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract 1
- 238000000151 deposition Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 238000005265 energy consumption Methods 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910002651 NO3 Inorganic materials 0.000 description 3
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 230000003134 recirculating effect Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000638 solvent extraction Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 230000009466 transformation Effects 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
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The utility model relates to a loop circulation MBR system, comprising: the reactor body, the MBR pool is an integral building body of the membrane bioreactor and the secondary sedimentation tank; the part of the bottom of the MBR tank is taken as an MBR micro-oxygen area. The beneficial effects of the utility model are as follows: integrates the nitrification and denitrification process, the dephosphorization and decarbonization process and the mud-water separation process, does not need a backflow channel and a pipeline, and reduces the investment; the water outlet effect of the integral building body of the membrane bioreactor and the secondary sedimentation tank is obviously improved; the mixed solution in the MBR tank is saturated and dissolved oxygen is returned to the aerobic tank nearby, and the oxygen supply of the aerobic tank can be reduced by 5% -10%; the part of the bottom of the MBR tank is taken as an MBR micro-oxygen area, so that direct impact of inflow water on a hollow fiber membrane component is avoided, the denitrification effect of sewage is improved, and the total nitrogen index is ensured to reach the standard; a double-layer aeration device is arranged in the MBR tank to ensure the gas scrubbing of the hollow fiber membrane component; ensuring the MBR micro-oxygen area to be in an anoxic state and preventing sludge deposition.
Description
Technical Field
The utility model belongs to the technical field of sewage treatment, and particularly relates to a circulation MBR system.
Background
In recent years, the working standards of urban sewage pipe network improvement and standard improvement and transformation of sewage treatment plants are gradually improved, and the standards are improved into IV-class water standards (quasi IV-class standards for short) in surface water environment quality standards (GB 3838-2002).
The patent application 201921294726.5 of the applicant, namely a nested ultra-large assembled loop reactor, discloses an assembled loop reactor body, which comprises a bottom plate and three rings of annular baffle plates vertically arranged on the bottom plate, wherein the three rings of annular baffle plates divide the reactor body into three channels from the center to the periphery, namely an anaerobic zone, an anoxic zone and an aerobic zone; the patent adopts a gravity type sedimentation mode of a sedimentation tank as a solid-liquid separation means, which brings about a plurality of problems: such as low solid-liquid separation efficiency, low volume load of the treatment device, large occupied area, unstable effluent quality, low oxygen transfer efficiency, high energy consumption, large output of residual sludge and the like; in addition, the effluent of the sewage can not reach the standard of quasi IV class.
To accommodate the escalating criteria; a is adopted in sewage treatment plants in industry 2 O (or deformation strengthening process) +mbr process; however, the combination of these two processes has the following problems:
1) The MBR unit has complex water inlet distribution and backflow system, and the arranged backflow pool and channel are longer;
2) In order to prevent sludge deposition in the backflow channel, a complex air stirring system is required to be arranged in the backflow tank and the channel;
3) The water distribution and backflow channels of the MBR unit can increase the head loss of the biochemical unit and increase the backflow lifting energy consumption; saturated dissolved oxygen in the mixed liquid of the MBR pool is released in an accelerating way, and the saturated dissolved oxygen is not fully utilized in the aerobic pool;
4) The effective water depth actually required by the MBR unit is 2-3 meters lower than that of the biochemical unit, if the MBR unit and the biochemical unit are simply built together, the elevation of the MBR unit bottom plate is inconsistent with that of the biochemical unit bottom plate, and the built-together structure is complex; if the MBR unit and the biochemical unit are separately constructed, the occupied area is larger, and the project investment cost is increased.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provides a circulation MBR system.
The circulating MBR system comprises a reactor body, wherein the reactor body comprises a bottom plate and three rings of annular separation baffles vertically arranged on the bottom plate, the three rings of annular separation baffles are an inner ring separation baffle, a middle ring separation baffle and an outer ring separation baffle respectively, and the inner ring separation baffle, the middle ring separation baffle and the outer ring separation baffle divide the reactor body into a first area to a third area from the center to the periphery; the first area is an anaerobic tank, and the second area is an anoxic tank; the top of the inner ring partition baffle is provided with an anaerobic tank water hole, the top of the middle ring partition baffle is provided with an anoxic tank water hole, and a water inlet pipe is led into the anaerobic tank from the outside of the reactor body; a first partition plate and a second partition plate are arranged in the third area, the first partition plate and the second partition plate divide the third area into an aerobic tank and an MBR tank, and water passing ports are formed in the bottoms of the first partition plate and the second partition plate;
the MBR tank is an integral building body of the Membrane Bioreactor (MBR) and the secondary sedimentation tank, and compared with the Membrane Bioreactor (MBR) which is independently arranged, the water outlet effect of the integral building body of the Membrane Bioreactor (MBR) and the secondary sedimentation tank is obviously improved; a plurality of groups of membrane supporting components are arranged in the secondary sedimentation tank, the upper part of each group of membrane supporting components is provided with a hollow fiber membrane component, and an MBR aeration system is arranged below the hollow fiber membrane component on the membrane supporting components; the lower part of each group of membrane supporting components is provided with an aeration device which is not arranged at the bottom of the MBR tank but arranged at the lower part of the membrane supporting components; because the Membrane Bioreactor (MBR) and the secondary sedimentation tank are made into an integrated MBR tank, the effective water depth of the MBR tank is increased compared with that of the original single-set Membrane Bioreactor (MBR), the empty part at the bottom of the MBR tank is used as an MBR micro-oxygen area, the direct impact of inflow water on a hollow fiber membrane component is avoided, the improvement of urban sewage pipe network and the standard improvement of a sewage treatment plant are improved to a standard of quasi-IV type, the requirement of the MBR tank on the total nitrogen removal of sewage is increased, the MBR micro-oxygen area is equivalent to a post-anoxic tank, after the water passing through an aerobic area passes through the MBR micro-oxygen area, nitrate is in an anoxic state, a carbon source is selectively added or not added, and a denitrification process is generated again, so that the denitrification effect of the sewage can be improved, and the total nitrogen index is ensured to reach the standard; an MBR water inflow buffer zone is not required, so that the area of a membrane pool is reduced, and the investment is reduced;
the anaerobic tank is internally provided with a stirring device which is used for promoting sewage which is introduced into the anaerobic tank from a water inlet pipe to circulate to the anoxic tank; a plurality of flow pushing devices are arranged in the anoxic tank, and the flow pushing devices further assist the sewage flowing from the anaerobic tank to the anoxic tank and the sewage sucked from the reflux zone to the anoxic tank through the nitrifying liquid reflux pump to flow back to the aerobic zone; an anoxic tank inner baffle plate perpendicular to the middle ring baffle plate close to the MBR tank is arranged in the anoxic tank, and the arrangement of the anoxic tank inner baffle plate enables water at the tail end of the anoxic zone to flow to the aerobic zone only and not flow back to the beginning end of the anoxic zone; an aeration device is uniformly paved at the bottom of the aerobic tank, so that the sludge in the aerobic tank is prevented from depositing while oxygen is supplied, and water flowing into the aerobic tank flows out by the aeration device and cannot be deposited; the aerobic tank is communicated with an MBR micro-oxygen area at the bottom of the MBR tank through a water passing port at the bottom of the second partition plate;
the water outlet sections at the two ends of the MBR tank are respectively provided with a backflow area, the MBR tank is communicated with the backflow areas through sleeve valves, the sleeve valves are used for sucking muddy water separated from the MBR tank to the backflow areas, and the liquid level in the MBR tank can be ensured on one hand and the water distribution of the MBR tank can be uniform through adjustment of the sleeve valves; on the other hand, the water inlet of the MBR tank can be opened and closed, and the cleaning of the MBR tank is not affected; a water passing hole is formed in the second partition plate between the backflow area and the aerobic tank, and a membrane backflow pump is further arranged at the water passing hole and used for sucking water in the backflow area to the aerobic tank; a water passing hole is formed in the middle ring baffle plate between the anoxic pond and one of the backflow areas, a nitrifying liquid backflow pump is arranged on the water passing hole, and the nitrifying liquid backflow pump is used for sucking water entering the backflow area from the aerobic pond and water pumped to the backflow area from the MBR pond to the anoxic pond; the inner ring baffle plate between the anoxic tank and the anaerobic tank is provided with a water passing hole, and the water passing hole is provided with an anoxic tank reflux pump which is used for sucking water in the anoxic tank back to the anaerobic tank.
Preferably, in the MBR tank, the area where the hollow fiber membrane component at the upper part of the MBR micro-oxygen area is positioned is a membrane separation area or an aerobic area.
Preferably, a suction pump for sucking water to the outside is further provided in the MBR tank.
Preferably, as the bottom of the MBR micro-oxygen area is not provided with a stirring device, an aeration device in the aerobic tank is connected with an air outlet of the same fan with an aeration device arranged at the lower part of the membrane supporting component, and the aeration device arranged at the lower part of the membrane supporting component is connected with the air outlet of the fan through an aeration pipeline, so that the oxygen is supplied and the sludge deposition in the MBR micro-oxygen area and the aerobic tank can be prevented; if the air quantity of the MBR tank and the air quantity of the aerobic tank are supplied by adopting the fans of the original aerobic tank, the power of the needed fans is much higher; the utility model arranges the hollow fiber membrane component at the upper part of the MBR pool, the lower part of the MBR pool is an MBR micro-oxygen area, and the power of a fan required by the upper part of the MBR pool is the same as that of a fan required by the original Membrane Bioreactor (MBR); the water level of the MBR tank is almost the same as that of the aerobic tank, and the aeration device only needs to intermittently aerate and stir at regular intervals, so that sludge is prevented from accumulating, and the MBR micro-oxygen area is kept in an anoxic state.
Preferably, the MBR aeration system is connected with an MBR fan, the air pressure of the MBR fan is not increased, and the air scrubbing of the hollow fiber membrane component is ensured.
Preferably, the stirring device is a vertical stirrer.
Preferably, the aeration devices uniformly paved at the bottom of the aerobic tank are microporous aerators, and the lower part of each group of membrane supporting components is provided with the aeration devices which are tubular microporous aerators.
The beneficial effects of the utility model are as follows:
(1) The circulating MBR system mainly comprises three annular areas, wherein the inner ring is an anaerobic tank, the middle ring is an anoxic tank, the outer ring is an aerobic tank and an MBR tank, and the whole system integrates a nitrification and denitrification process, a dephosphorization and decarbonization process and a mud-water separation process; by adopting circulation, all the reflux systems (MBR pool to aerobic pool, aerobic pool to anoxic pool and anoxic pool to anaerobic pool) are adjacent, and no reflux channel and pipeline are needed, so that project investment is reduced, and reflux lifting energy consumption is reduced.
(2) The utility model builds a Membrane Bioreactor (MBR) and a secondary sedimentation tank integrally to form an MBR tank; the aeration device is not arranged at the bottom of the MBR tank, but is arranged at the lower part of the membrane supporting assembly; compared with the independent setting of the Membrane Bioreactor (MBR), the water outlet effect of the integrated building body of the Membrane Bioreactor (MBR) and the secondary sedimentation tank is obviously improved.
(3) The water outlet sections at the two ends of the MBR tank are respectively provided with a backflow area, the MBR tank is communicated with the backflow areas through sleeve valves, the sleeve valves are used for sucking muddy water separated from the MBR tank to the backflow areas, and the liquid level in the MBR tank can be ensured on one hand and the water distribution of the MBR tank can be uniform through adjustment of the sleeve valves; on the other hand, the water inlet of the MBR tank can be opened and closed, and the cleaning of the MBR tank is not affected; a water passing hole is formed in the second partition plate between the backflow area and the aerobic tank, and a membrane backflow pump is further arranged at the water passing hole and used for sucking water in the backflow area to the aerobic tank; the mixed solution in the MBR tank is saturated and dissolved oxygen is returned to the aerobic tank nearby, the oxygen supply of the aerobic tank can be reduced by 5% -10%, and the energy consumption of the aerobic tank is further reduced.
(4) The effective water depth of the MBR tank is increased compared with that of the original single-Membrane Bioreactor (MBR), the part which is vacated at the bottom of the MBR tank is used as an MBR micro-oxygen area, so that direct impact of inflow water on a hollow fiber membrane component is avoided, the MBR micro-oxygen area is equivalent to a rear anoxic tank, after water passing through an aerobic area passes through the MBR micro-oxygen area, nitrate is in an anoxic state, a carbon source is selectively added or not added, a denitrification process occurs again, the denitrification effect of sewage can be improved, and the total nitrogen index is ensured to reach the standard; and an MBR water inflow buffer zone is not required, so that the area of a membrane tank is reduced, and the investment is reduced.
(5) A double-layer aeration device is arranged in the MBR tank, and an upper-layer MBR aeration system is connected with an MBR fan, so that the air pressure of the MBR fan is not increased, and the air scrubbing of the hollow fiber membrane component is ensured; the lower layer pipe type microporous aerator is connected with an aerobic unit air supply fan to perform intermittent aeration, so that the MBR micro-oxygen area is ensured to be in an anoxic state and sludge deposition is prevented.
Drawings
FIG. 1 is an upper level plan view of a loop-circulating MBR system;
FIG. 2 is a bottom plan view of a loop-circulating MBR system;
FIG. 3 is a cross-sectional view of A-A of a recirculating MBR system;
FIG. 4 is a B-B cross-sectional view of a recirculating MBR system;
fig. 5 is a C-C section view of a loop-circulating MBR system.
Reference numerals illustrate: the anaerobic treatment device comprises a sleeve valve 1, an aerobic tank 2, an MBR tank 3, a reflux zone 4, a hollow fiber membrane assembly 5, a membrane reflux pump 6, an anaerobic tank water passing hole 7, an anoxic tank 8, a nitrifying liquid reflux pump 9, a flow pushing device 10, an anoxic tank reflux pump 11, an anaerobic tank 12, a vertical stirrer 13, a water inlet pipe 14, a microporous aerator 15, a membrane support assembly 16, an MBR aeration system 17, a tubular microporous aerator 18, an MBR micro-oxygen zone 19, an anoxic tank water passing hole 20, an inner ring baffle 21, a middle ring baffle 22, an outer ring baffle 23, a first baffle 24, a second baffle 25 and an anoxic tank inner baffle 26.
Detailed Description
The utility model is further described below with reference to examples. The following examples are presented only to aid in the understanding of the utility model. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present utility model without departing from the principles of the utility model, and such modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims.
As an example, as shown in fig. 1 to 5, a loop circulation MBR system includes a reactor body including a bottom plate and three annular partition plates vertically disposed on the bottom plate, the three annular partition plates being an inner partition plate 21, a middle partition plate 22 and an outer partition plate 23, respectively, the inner partition plate 21, the middle partition plate 22 and the outer partition plate 23 partitioning the reactor body from the center to the outer circumference into first to third regions; the first area is an anaerobic tank 12, and the second area is an anoxic tank 8; the top of the inner ring partition baffle is provided with an anaerobic tank water passing hole 7, the top of the middle ring partition baffle 22 is provided with an anoxic tank water passing hole 20, and the water inlet pipe 14 is led into the anaerobic tank 12 from the outside of the reactor body; a first partition board 24 and a second partition board 25 are arranged in the third area, the first partition board 24 and the second partition board 25 divide the third area into an aerobic tank 2 and an MBR tank 3, and water passing ports are formed in the bottoms of the first partition board 24 and the second partition board 25;
in the prior art, the membrane tank and the aerobic tank are two different tank bodies which are separately built, and a fan of the membrane tank only needs to overcome the deep water resistance of the membrane tank (only needs wind pressure of about 4 m); in the embodiment, the MBR tank 3 is an integral building body of a Membrane Bioreactor (MBR) and a secondary sedimentation tank, and the water depth of the MBR tank 3 is consistent with that of the aerobic tank 2 and reaches about 5.5-6 m; compared with the independent arrangement of the Membrane Bioreactor (MBR), the water outlet effect of the integrated building body of the Membrane Bioreactor (MBR) and the secondary sedimentation tank is obviously improved; the MBR membrane pond is shallow in water depth, the biochemical water is deep in effective water depth, a plurality of groups of membrane support assemblies 16 are arranged in the secondary sedimentation pond, the upper part of each group of membrane support assemblies 16 is provided with a hollow fiber membrane assembly 5, an MBR aeration system 17 is arranged below the hollow fiber membrane assemblies 5 on the membrane support assemblies 16, the MBR aeration system 17 is connected with an MBR fan, the air pressure of the MBR fan is not increased, and the air scrubbing of the hollow fiber membrane assemblies is ensured; the lower part of each group of membrane supporting components 16 is provided with a tubular microporous aerator 18, and the aeration device is arranged at the lower part of the membrane supporting components instead of the bottom of the MBR tank; because the Membrane Bioreactor (MBR) and the secondary sedimentation tank are made into an integrated MBR tank, the effective water depth of the MBR tank is increased compared with that of the original single-Membrane Bioreactor (MBR), the part of the bottom of the MBR tank 3 is taken as an MBR micro-oxygen area 19, the direct impact of inflow water on a hollow fiber membrane component is avoided, the improvement of urban sewage pipe network and the standard improvement of a sewage treatment plant are improved to a standard of quasi-IV type, the requirement of the MBR tank on the total nitrogen removal of sewage is increased, the MBR micro-oxygen area is equivalent to a post-anoxic tank, after the water passing through an aerobic area passes through the MBR micro-oxygen area, nitrate is in an anoxic state, a carbon source is selectively added or not added, and a denitrification process is performed again, so that the denitrification effect of the sewage can be improved, and the total nitrogen index is ensured to reach the standard; an MBR water inflow buffer zone is not required, so that the area of a membrane pool is reduced, and the investment is reduced; in the MBR tank 3, the area where the hollow fiber membrane component 5 at the upper part of the MBR micro-oxygen area 19 is positioned is a membrane separation area or an aerobic area; a suction pump for sucking water to the outside is also arranged in the MBR tank 3;
a vertical stirrer 13 is arranged in the anaerobic tank 12 and is used for promoting the sewage which is introduced into the anaerobic tank from a water inlet pipe to circulate to the anoxic tank; a plurality of flow pushing devices 10 are arranged in the anoxic tank 8, and the flow pushing devices further assist the sewage flowing from the anaerobic tank to the anoxic tank and the sewage sucked from the reflux zone to the anoxic tank through a nitrifying liquid reflux pump to reflux to the aerobic zone; an anoxic tank inner baffle 26 perpendicular to the middle baffle 22 close to the MBR tank 3 is arranged in the anoxic tank 8, and the anoxic tank inner baffle is arranged so that water at the tail end of the anoxic zone only flows to the aerobic zone and does not flow back to the beginning end of the anoxic zone; the bottom of the aerobic tank 2 is uniformly paved with a microporous aerator 15, so that the sludge in the aerobic tank is prevented from depositing while oxygen is supplied, and the water flowing into the aerobic tank flows out by the aeration device and is not deposited; the aerobic tank 2 is communicated with an MBR micro-oxygen area 19 at the bottom of the MBR tank 3 through a water passing port at the bottom of a second partition plate 25;
because the bottom of the MBR micro-oxygen area is not well provided with a stirring device, an aeration device in the aerobic tank 2 is connected with an air outlet of the same fan with an aeration device arranged at the lower part of the membrane support assembly 16, and the aeration device arranged at the lower part of the membrane support assembly 16 is connected with the air outlet of the fan through an aeration pipeline, so that the oxygen is supplied and the sludge deposition in the MBR micro-oxygen area and the aerobic tank can be prevented; if the air quantity of the MBR tank and the air quantity of the aerobic tank are supplied by adopting the fans of the original aerobic tank, the power of the needed fans is much higher (the fans need to reach the air pressure of 6-7 m, which is equivalent to the air pressure increase compared with the traditional MBR fans, and the long-term operation of equipment is not facilitated); the hollow fiber membrane component is arranged at the upper part of the MBR tank, the lower part of the MBR tank is an MBR micro-oxygen area, the power of a fan required by the upper part of the MBR tank is the same as that of a fan required by the original Membrane Bioreactor (MBR) (the fan is the same as that of the fan which is originally arranged at the bottom of the tank, and the operation energy consumption is the same); the water level of the MBR tank is almost the same as that of the aerobic tank, and the aeration device only needs to intermittently perform aeration and stirring periodically, so that sludge is prevented from accumulating, and the MBR micro-oxygen area is kept in an anoxic state;
the water outlet sections at the two ends of the MBR tank 3 are respectively provided with a backflow area 4, the MBR tank 3 is communicated with the backflow areas 4 through a sleeve valve 1, the sleeve valve is used for sucking muddy water separated from the MBR tank to the backflow areas, and the liquid level in the MBR tank can be ensured on one hand and the water distribution of the MBR tank can be uniform through adjustment of the sleeve valve; on the other hand, the water inlet of the MBR tank can be opened and closed, and the cleaning of the MBR tank is not affected; a water passing hole is arranged on a second partition plate 25 between the reflux zone 4 and the aerobic tank 2, and a membrane reflux pump 6 is also arranged at the water passing hole and used for sucking water in the reflux zone to the aerobic tank; a water passing hole is formed in a middle ring baffle 22 between the anoxic pond 8 and one of the backflow areas 4, a nitrifying liquid backflow pump 9 is arranged on the water passing hole, and the nitrifying liquid backflow pump is used for sucking water entering the backflow areas from the aerobic pond and water pumped to the backflow areas from the MBR pond to the anoxic pond; a water passing hole is arranged on an inner ring baffle 21 between the anoxic tank 8 and the anaerobic tank 12, and an anoxic tank reflux pump 11 is arranged on the water passing hole and is used for sucking water in the anoxic tank back to the anaerobic tank.
In the prior art, a gravity type sedimentation mode of a sedimentation tank is adopted as a solid-liquid separation means, and the effluent of sewage cannot reach the standard of quasi IV class; in this embodiment, the MBR tank is an integral building body of a Membrane Bioreactor (MBR) and a secondary sedimentation tank, and the sewage effluent can reach the standard of quasi-class iv.
Claims (7)
1. The circulating MBR system comprises a reactor body, wherein the reactor body comprises a bottom plate and three rings of annular separation baffles which are vertically arranged on the bottom plate, the three rings of annular separation baffles are an inner ring separation baffle (21), a middle ring separation baffle (22) and an outer ring separation baffle (23), and the inner ring separation baffle (21), the middle ring separation baffle (22) and the outer ring separation baffle (23) divide the reactor body into a first area to a third area from the center to the periphery; the first area is an anaerobic tank (12), and the second area is an anoxic tank (8); the top of the inner ring separation baffle is provided with an anaerobic tank water hole (7), the top of the middle ring separation baffle (22) is provided with an anoxic tank water hole (20), and the water inlet pipe (14) is led into the anaerobic tank (12) from the outside of the reactor body; the method is characterized in that: a first partition board (24) and a second partition board (25) are arranged in the third area, the first partition board (24) and the second partition board (25) divide the third area into an aerobic tank (2) and an MBR tank (3), and water passing ports are formed in the bottoms of the first partition board (24) and the second partition board (25);
the MBR tank (3) is an integral building body of the membrane bioreactor and the secondary sedimentation tank; a plurality of groups of membrane support assemblies (16) are arranged in the secondary sedimentation tank, the upper part of each group of membrane support assemblies (16) is provided with a hollow fiber membrane assembly (5), and an MBR aeration system (17) is arranged below the hollow fiber membrane assemblies (5) on the membrane support assemblies (16); the lower part of each group of membrane supporting components (16) is provided with an aeration device; the part left out of the bottom of the MBR pool (3) is used as an MBR micro-oxygen area (19);
a stirring device is arranged in the anaerobic tank (12); a plurality of flow pushing devices (10) are arranged in the anoxic tank (8); an anoxic tank inner baffle (26) perpendicular to a middle ring baffle (22) close to the MBR tank (3) is arranged in the anoxic tank (8); an aeration device is uniformly paved at the bottom of the aerobic tank (2); the aerobic tank (2) is communicated with an MBR micro-oxygen area (19) at the bottom of the MBR tank (3) through a water passing port at the bottom of a second partition board (25);
the water outlet sections at the two ends of the MBR tank (3) are respectively provided with a backflow area (4), and the MBR tank (3) is communicated with the backflow areas (4) through sleeve valves (1); a water passing hole is arranged on a second partition plate (25) between the reflux zone (4) and the aerobic tank (2), and a membrane reflux pump (6) is also arranged at the water passing hole; a middle ring baffle (22) between the anoxic tank (8) and one of the reflux areas (4) is provided with a water passing hole, and a nitrifying liquid reflux pump (9) is arranged on the water passing hole; the inner ring separating baffle (21) between the anoxic tank (8) and the anaerobic tank (12) is provided with a water passing hole, and the water passing hole is provided with an anoxic tank reflux pump (11).
2. The loop circulation MBR system of claim 1, wherein: in the MBR tank (3), the area where the hollow fiber membrane component (5) at the upper part of the MBR micro-oxygen area (19) is positioned is a membrane separation area or an aerobic area.
3. The loop circulation MBR system of claim 1, wherein: and a suction pump for sucking water to the outside is also arranged in the MBR tank (3).
4. The loop circulation MBR system of claim 1, wherein: the aeration device in the aerobic tank (2) is connected with the aeration device arranged at the lower part of the membrane supporting component (16) and the air outlet of the same fan, and the aeration device arranged at the lower part of the membrane supporting component (16) is connected with the air outlet of the fan through an aeration pipeline.
5. The loop circulation MBR system of claim 1, wherein: and the MBR aeration system (17) is connected with an MBR fan.
6. The loop circulation MBR system of claim 1, wherein: the stirring device is a vertical stirrer (13).
7. The loop circulation MBR system of claim 1, wherein: the aeration devices uniformly paved at the bottom of the aerobic tank (2) are microporous aerators (15), and the lower part of each group of membrane supporting components (16) is provided with a tubular microporous aerator (18).
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