CN107285459B - Membrane bioreactor - Google Patents
Membrane bioreactor Download PDFInfo
- Publication number
- CN107285459B CN107285459B CN201710701187.1A CN201710701187A CN107285459B CN 107285459 B CN107285459 B CN 107285459B CN 201710701187 A CN201710701187 A CN 201710701187A CN 107285459 B CN107285459 B CN 107285459B
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- screen plate
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- air inlet
- screen
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- 239000012528 membrane Substances 0.000 title claims abstract description 148
- 238000005273 aeration Methods 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 239000003292 glue Substances 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000005192 partition Methods 0.000 claims abstract description 15
- 230000000149 penetrating effect Effects 0.000 claims abstract description 7
- 239000007788 liquid Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000004907 flux Effects 0.000 abstract description 6
- 230000002265 prevention Effects 0.000 abstract description 3
- 238000011010 flushing procedure Methods 0.000 description 19
- 238000000034 method Methods 0.000 description 15
- 239000010865 sewage Substances 0.000 description 10
- 238000001914 filtration Methods 0.000 description 8
- 238000003756 stirring Methods 0.000 description 8
- 238000004140 cleaning Methods 0.000 description 7
- 238000000926 separation method Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 239000010802 sludge Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000012510 hollow fiber Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000009285 membrane fouling Methods 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000008213 purified water Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1268—Membrane bioreactor systems
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
- C02F3/201—Perforated, resilient plastic diffusers, e.g. membranes, sheets, foils, tubes, hoses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- 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 invention provides a membrane bioreactor, which comprises membrane wires, a shell with an opening at the upper end, a first screen plate, a second screen plate and an aeration member; the partition board in the shell divides the shell cavity into an upper cavity and a lower cavity, the first screen board and the second screen board are arranged in the upper cavity at intervals, the cavity between the first screen board and the second screen board is used as an injecting glue layer, the cavity between the second screen board and the partition board is used as a water outlet layer, and the lower cavity is used as an air inlet layer; the first screen plate and the second screen plate are provided with a plurality of screen holes which are uniformly arranged at intervals and used for penetrating through membrane wires; a plurality of aeration members are uniformly arranged at intervals in the center of the interior of the shell; the aeration component sequentially penetrates through the air inlet layer, the water outlet layer and the glue injection layer from bottom to top; the part of the aeration component, which is positioned in the air inlet layer, is provided with an air inlet hole; the open ends of the membrane wires sequentially penetrate through the sieve holes and extend into the water outlet layer. The invention has the advantages of simple structure, low manufacturing cost and running cost, high membrane flux and good membrane pollution prevention and control effect.
Description
Technical Field
The present invention relates to sewage treatment equipment, and more particularly, to a membrane bioreactor.
Background
In recent years, the application of membrane technology in the field of sewage treatment, in particular, the membrane bioreactor (Membrane Bioreactor, abbreviated as MBR) process combined with a bioreactor has received increasing attention as a novel efficient sewage treatment process. MBR is a novel water treatment technology comprising a membrane separation unit and a biological treatment unit, wherein a membrane component is used for replacing a secondary sedimentation tank, so that the occupation of a sewage treatment facility is reduced by keeping high active sludge concentration in a biological reactor, and the sludge amount is reduced by keeping low sludge load. The MBR process has the advantages of simple operation, separation of Hydraulic Retention Time (HRT) and sludge age (SRT), high sludge concentration, strong impact load resistance, good effluent quality and the like. In the membrane bioreactor, the bioreactor mainly completes degradation of pollutants in sewage; the membrane separation unit mainly completes solid-liquid separation and has a trapping effect on some macromolecular compounds, and the membrane used is generally ultrafiltration or microfiltration membrane.
In practical application, membrane flux is reduced due to the fact that membrane components of the MBR are easy to pollute in the operation process, stable operation of the membrane components is affected, and membrane pollution becomes a key problem for limiting MBR application. Membrane fouling refers to the phenomenon that suspended particles, colloid particles or soluble macromolecular organic matters are adsorbed and deposited on the surface and in the membrane pores, so that the pore diameter of the membrane is reduced or blocked, and the membrane flux is reduced.
In the prior art, in order to prevent and treat membrane pollution and improve the treatment effect of MBR, the following method is generally adopted:
1. biological aeration is combined with air-water cleaning.
The external hollow fiber membrane bioreactor (CN 2755081Y) comprises a hollow fiber bundle, a gas-liquid distributor with a central connecting port and a shell, can realize the uniform distribution of feed liquid and the on-site cleaning of a membrane module, and has the advantages of easy unit management and maintenance and stable filtering performance.
The method for cleaning the surface of the membrane by using the upward flow of air and water while supplying oxygen to the unit has the defect that the aeration amount meeting biological reaction cannot be very large, and the effect of scrubbing the membrane by simply relying on the upward flow of air is limited.
2. Compressed air is added to the backwash water.
The membrane bioreactor membrane air-water back flushing device (CN 2530940Y) relates to an air-water back flushing device, and is characterized in that compressed air is adopted to back flush the membrane, so that the back flushing effect is improved.
The method utilizes a small amount of backwash water to slow down the blockage of the membrane, prolongs the service life of the membrane and improves the backwash effect to a certain extent, but the method still stays on the backwash layer and has limited effect of preventing and treating the pollution of the membrane.
3. A perturbation device is added in the reactor.
The membrane bioreactor (CNl 727289A) comprises at least one pre-filtering layer, at least one biological membrane unit and at least one turbulence device, wherein the turbulence device is clamped between the pre-filtering layer and the biological membrane unit and can disturb sewage between the pre-filtering layer and the biological membrane unit, and the membrane bioreactor has the advantages of high flow rate, convenient membrane cleaning, long membrane operation period and low running cost.
The method strengthens the cleaning effect of the membrane surface by improving the turbulent intensity of the liquid flow, and is effective in slowing down the deposition of membrane surface pollutants and improving the cleaning efficiency, but the turbulent device is a static device, so that the membrane surface is cleaned by the kinetic energy of the liquid flow, and the cleaning effect is limited under the condition that the reflux ratio is impossible to be too large.
In addition, the conventional MBR generally has the following drawbacks: a. the bottom aeration system is required to be designed independently, the equipment is complex and huge, and the cost is high; b. the membrane wires adopt a bundle structure, so that dirty east and west or suspended matters are clamped between the membrane wires and cannot be washed; c. the film wires are directly stuck by glue after being bound, so that the film wires are caused to fall off from the film structure due to long-time left-right back-and-forth swing in the operation process; d. the energy consumption of the fan is high when the aeration system is stirred by the fan; e. the maintenance process is complex and requires high demands on equipment and technicians.
Disclosure of Invention
The invention aims to solve the technical problems of providing the membrane bioreactor which has the advantages of simple structure, low manufacturing cost and running cost, high membrane flux and good membrane pollution prevention and control effect.
In order to solve the technical problems, the invention provides a membrane bioreactor, which comprises membrane filaments and an aeration device; the membrane wire is provided with a hollow channel, one end of the hollow channel is closed, the other end of the hollow channel is open, and the aeration device is connected to the open end of the membrane wire; the aeration device comprises a shell with an opening at the upper end, a first screen plate, a second screen plate and an aeration member; the shell is internally provided with a baffle plate, the baffle plate divides the cavity of the shell into an upper cavity and a lower cavity, the first screen plate and the second screen plate are arranged in the upper cavity at intervals and are parallel to the baffle plate, the cavity between the first screen plate and the second screen plate is used as an injecting glue layer, the cavity between the second screen plate and the baffle plate is used as a water outlet layer, and the lower cavity is used as an air inlet layer; the first screen plate and the second screen plate are respectively provided with a plurality of screen holes for penetrating through the membrane wires, and the screen holes are uniformly arranged at intervals; a plurality of aeration members are uniformly arranged at intervals along the central line of the length direction of the shell; the aeration component is of a pipe fitting structure and is provided with an upper port and a lower port, and the aeration component sequentially penetrates through the air inlet layer, the water outlet layer and the glue injection layer from bottom to top; an air inlet hole is formed in the position of the aeration member in the air inlet layer; the open ends of the membrane wires sequentially penetrate through the sieve holes on the first sieve plate and the second sieve plate and extend into the water outlet layer; and the membrane wires, the aeration member, the first screen plate, the second screen plate and the shell are fixed together in a sealing way through glue injection in the glue injection layer.
As a preferable scheme of the invention, the first screen plate and the second screen plate are formed by sequentially splicing a plurality of square screen plate units with the same size, each screen plate unit is provided with a plurality of screen holes for penetrating and connecting the membrane wires, and the screen holes are uniformly arranged in an array.
As a preferable scheme of the invention, a water inlet matched and connected with the lower port is arranged at the bottom of the shell, a gas-liquid mixing outlet matched and connected with the upper port is arranged at the central position of each screen plate unit in the first screen plate, a first connecting hole allowing the upper port to pass through is arranged at the central position of each screen plate unit in the second screen plate, and a second connecting hole allowing the lower port to pass through is arranged on the partition plate.
As a preferable mode of the invention, the aeration member is a stepped pipe fitting structure, and comprises an upper pipe portion, a middle pipe portion and a lower pipe portion which are connected in sequence, wherein the outer diameter of the upper pipe portion is smaller than that of the middle pipe portion, and the outer diameter of the middle pipe portion is smaller than that of the lower pipe portion.
As a preferable scheme of the invention, the upper pipe part penetrates through the space between the first screen plate and the second screen plate, the upper end of the upper pipe part is matched with the gas-liquid mixing outlet, and the lower end of the upper pipe part is matched with the first connecting hole; the middle pipe part penetrates through the space between the second screen plate and the partition plate; the lower pipe portion penetrates through the space between the partition plate and the bottom of the shell, the upper end of the lower pipe portion is matched with the second connecting hole and sealed, and the lower end of the lower pipe portion is matched with the water inlet and sealed.
As a preferable scheme of the invention, a baffle is arranged at the joint of the middle pipe part and the lower pipe part, and the outer diameter of the baffle is larger than the inner diameter of the second connecting hole.
As a preferable scheme of the invention, a plurality of grooves for glue injection are uniformly arranged on the pipe wall of the upper pipe part.
As a preferred embodiment of the present invention, the air intake holes are provided obliquely upward from the outside to the inside of the aeration member.
As a preferable scheme of the invention, two ends of the shell are open, one end of the shell is provided with a water outlet component, and the other end is provided with an air inlet component; the water outlet component comprises a first end cover plate and a water outlet interface, the first end cover plate is covered at one end of the shell, the water outlet interface is arranged on the first end cover plate, and the water outlet interface is communicated with the water outlet layer; the air inlet component comprises a second end cover plate and an air inlet interface, wherein the second end cover plate is covered on the other end of the shell, the air inlet interface is arranged on the second end cover plate, and the air inlet interface is communicated with the air inlet layer.
As a preferable scheme of the invention, a first clamping position which is clamped with the first screen plate is arranged at the inner edge of the upper end opening of the shell; and a second clamping position which is clamped with the second screen plate is arranged on the inner wall of the shell.
Compared with the prior art, the membrane bioreactor has the following beneficial effects:
(1) The screen plate is adopted to position each membrane wire at intervals, glue flows into gaps between the membrane wires through glue injection in the glue injection layer, each membrane wire is fully adhered, the phenomenon that membrane wires fall off due to long-time left-right front-back swing of a membrane wire bundle with a bundle structure in the running process of a machine is effectively solved, and meanwhile, each membrane wire can be fully utilized due to the design, and the membrane flux is high;
(2) The aeration component is arranged in the central area of the membrane filament bundle, the gas-liquid two-phase fluid released by the aeration component can pass through the space between the membrane filament and the membrane filament from the inside of the membrane filament bundle to the outside of the membrane filament bundle, so that the membrane filament is subjected to air stirring flushing and water flushing, the membrane filament positioned in the central area of the membrane filament bundle is effectively flushed in the process, no flushing places exist, the flushing efficiency is high, the membrane pollution control effect is good, and the filtering performance is stable;
(3) The original stirring and flushing by a fan is changed into air stirring and flushing and water flushing, so that the energy consumption of the fan is greatly saved;
(4) The design of the glue injection layer, the water outlet layer, the air inlet layer and the aeration component are combined to the same component (namely the shell), a bottom aeration system does not need to be designed independently, and the device has the advantages of simple structure, low cost and easy management and maintenance.
Drawings
In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.
FIG. 1 is a front view of an aeration device of a membrane bioreactor provided by the present invention;
FIG. 2 is a front side perspective view of an aeration device of a membrane bioreactor provided by the invention;
FIG. 3 is a perspective view of the back side of an aeration device of a membrane bioreactor provided by the invention;
FIG. 4 is a front view of a screen plate of a membrane bioreactor provided by the present invention;
FIG. 5 is a front view of a screen plate unit of a membrane bioreactor provided by the present invention;
FIG. 6 is a front view of an aeration member of a membrane bioreactor provided by the present invention;
FIG. 7 is a front view of a water outlet member of a membrane bioreactor according to the present invention;
fig. 8 is a front view of an air inlet member of a membrane bioreactor provided by the present invention.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 8, a membrane bioreactor according to a preferred embodiment of the present invention includes a membrane wire having a hollow passage with one end closed and the other end open, and an aeration device connected to the open end of the membrane wire.
The aeration device comprises a shell 1 with an opening at the upper end, a first screen plate 2, a second screen plate 3 and an aeration member 4. However, the housing 1 of the present embodiment has a long groove structure, and other shapes, such as a square groove structure, are also possible in another embodiment. The novel air inlet device is characterized in that a partition plate 5 is arranged in the shell 1, the cavity of the shell 1 is divided into an upper cavity and a lower cavity by the partition plate 5, the first screen plate 2 and the second screen plate 3 are arranged in the upper cavity at intervals and parallel to the partition plate 5, the cavity between the first screen plate 2 and the second screen plate 3 is an injecting glue layer 6, the cavity between the second screen plate 3 and the partition plate 5 is a water outlet layer 7, and the lower cavity is an air inlet layer 8. The glue injection layer 6 is used for filling epoxy resin, and connecting and fixing the membrane wires and the aeration device together; the water outlet layer 7 is used for outputting clean filtered water after membrane silk filtration; the gas inlet layer 8 is used for inputting gas into the aeration member 4.
The first screen plate 2 and the second screen plate 3 are respectively provided with a plurality of screen holes 9 for penetrating through the membrane wires, and the screen holes 9 are uniformly arranged at intervals, so that each membrane wire is separated, and a channel for fluid to pass through is formed between the membrane wires.
A plurality of aeration members 4 are uniformly arranged at intervals on the central line along the length direction of the shell 1, the aeration members 4 are of pipe fitting structures, the aeration members 4 are provided with an upper port 44 and a lower port 45, and the aeration members 4 sequentially penetrate through the air inlet layer 8, the water outlet layer 7 and the glue injection layer 6 from bottom to top; the aeration member 4 is provided with an air inlet hole 46 at a position in the air inlet layer 8. Wherein the upper port 44 is an output end, the lower port 45 is a purified water input end, and the air inlet hole 46 is a gas input end, so that the fluid released by the aeration member 4 can pass through the space between the membrane wires from inside to outside, and the membrane wire air stirring flushing and water flushing are realized.
The open ends of the membrane wires sequentially penetrate through the sieve holes 9 on the first sieve plate 2 and the second sieve plate 3 to extend into the water outlet layer 7, so that the filtered water of the external sewage filtered by the membrane wire membrane wall under the action of the suction equipment enters the hollow channel of the membrane wires and flows to the water outlet layer 7, and clean filtered water output is realized.
The membrane wires, the aeration member 4, the first screen plate 2, the second screen plate 3 and the shell 1 are fixed together in a sealing way through glue injection in the glue injection layer 6, so that the fixation of the membrane wires and the aeration device is realized.
The working principle of the membrane bioreactor is that when sewage is treated, the water outlet layer 7 forms negative pressure under the action of the suction equipment, sewage in a sewage tank enters the hollow channel through the membrane wall of the membrane wire, during the period, the membrane separation unit performs solid-liquid separation, some suspended particles, colloid particles or soluble macromolecular organic matters are trapped on the surface of the membrane and deposited in the membrane hole, filtered water enters the hollow channel of the membrane wire and flows to the water outlet layer 7, clean water filtering output is realized, and the filtered water can be used as industrial water and domestic water for recycling, and is energy-saving and environment-friendly. When the membrane filaments are washed, positive pressure air flow is provided for the air inlet layer 8 by a fan, the air flow enters the membrane filaments through the air inlet holes 46 of the aeration member 4, positive pressure water flow is provided for the aeration member 4 by pressure water on the other side, the water flow enters the membrane filaments through the lower port 45 of the aeration member 4, at the moment, the air flow and the water flow are mixed in the aeration member 4 and released from the upper port 44 of the aeration member 4, and therefore, the gas-liquid two-phase fluid released by the aeration member 4 passes between the membrane filaments from the inside of the membrane filaments to the outside of the membrane filaments, and air stirring washing and water washing of the membrane filaments are realized.
Therefore, compared with the prior art, the structure for implementing the membrane bioreactor has the following beneficial effects: firstly, each membrane wire is positioned at intervals by adopting a screen plate, glue is injected into a glue injection layer 6, so that the glue flows into gaps between the membrane wires, each membrane wire is fully adhered, the phenomenon that membrane wires fall off due to long-time left-right front-back swing of a membrane wire bundle with a bundle structure in the running process of a machine is effectively solved, and meanwhile, each membrane wire can be fully utilized by adopting the design, and the membrane flux is high; secondly, the aeration member 4 is arranged in the central area of the membrane filament bundle, the gas-liquid two-phase fluid released by the aeration member 4 can pass through the space between the membrane filament bundles from the inside of the membrane filament bundle to the outside of the membrane filament bundle, so that the membrane filament is subjected to air stirring flushing and water flushing, the membrane filament positioned in the central area of the membrane filament bundle in the process is effectively flushed, no flushing place exists, the flushing efficiency is high, the membrane pollution prevention and control effect is good, and the filtering performance is stable; thirdly, the original stirring and flushing by a fan is changed into air stirring and flushing and water flushing, so that the energy consumption of the fan is greatly saved; finally, the design of the glue injection layer 6, the water outlet layer 7, the air inlet layer 8 and the aeration member 4 are combined to the same member (namely the shell 1), a bottom aeration system does not need to be designed separately, and the device has the advantages of simple structure, low cost and easy management and maintenance.
Further, in this embodiment, the first screen plate 2 and the second screen plate 3 are formed by sequentially splicing a plurality of square screen plate units 21 with the same size, each screen plate unit 21 is provided with a plurality of screen holes 9 for penetrating through the membrane wires, and the screen holes 9 are uniformly arranged in an array. The design is beneficial to the modularized production of products and meets the needs of different customers.
Further, in this embodiment, in order to facilitate assembling the first screen plate 2, the second screen plate 3 and the aeration member 4, a water inlet 10 cooperatively connected with the lower port 45 is provided at the bottom of the housing 1, a gas-liquid mixing outlet 11 cooperatively connected with the upper port 44 is provided at the central position of each screen plate unit 21 in the first screen plate 2, a first connection hole 12 through which the upper port 44 can pass is provided at the central position of each screen plate unit 21 in the second screen plate 3, and a second connection hole 13 through which the lower port 45 can pass is provided at the partition 5. The aeration member 4 is a stepped pipe structure, and comprises an upper pipe 41, a middle pipe 42 and a lower pipe 43 which are sequentially connected, wherein the outer diameter of the upper pipe 41 is smaller than that of the middle pipe 42, and the outer diameter of the middle pipe 42 is smaller than that of the lower pipe 43. The upper pipe 41 penetrates between the first screen 2 and the second screen 3, the upper end of the upper pipe 41 (i.e. the upper port 44 of the aeration member 4) is matched with the gas-liquid mixing outlet 11, and the lower end of the upper pipe 41 is matched with the first connecting hole 12; the middle pipe part 42 penetrates between the second screen plate 3 and the partition plate 5; the lower pipe portion 43 penetrates between the partition 5 and the bottom of the housing 1, the upper end of the lower pipe portion 43 is engaged with and sealed with the second connection hole 13, and the lower end of the lower pipe portion 43 (i.e., the lower port 45 of the aeration member 4) is engaged with and sealed with the water inlet 10. A baffle 47 is provided at the junction of the middle pipe portion 42 and the lower pipe portion 43, and the outer diameter of the baffle 47 is larger than the inner diameter of the second connecting hole 13. A first clamping position 15 which is clamped with the first screen plate 2 is arranged at the inner edge of the upper end opening of the shell 1; the inner wall of the shell 1 is provided with a second clamping position 16 which is clamped with the second screen plate 3. During assembly, the lower port 45 of the aeration member 4 passes through the second connecting hole 13 and is inserted into the water inlet 10, the baffle 47 is just blocked by the upper surface of the baffle 5, the axial positioning of the aeration member 4 is realized, then the second screen plate 3 is sleeved to a preset position (namely, a shoulder position between the upper pipe part 41 and the middle pipe part 42) by aligning the upper port 44 of the aeration member 4 through the first connecting hole 12 on the baffle, the second screen plate 3 is just blocked by the second blocking position 16, finally the first screen plate 2 is sleeved by aligning the gas-liquid mixing outlet 11 on the baffle to the upper port 44 of the aeration member 4, and the first screen plate 2 is just blocked by the first blocking position 15, so that the first screen plate 2, the second screen plate 3 and the aeration member 4 are assembled.
Further, in this embodiment, a plurality of grooves 48 into which glue can be injected are uniformly formed on the wall of the upper pipe 41. Specifically, the number of grooves 48 is 4, and the two grooves are symmetrically arranged on the two sides of the pipe wall of the upper pipe 41. This design enables each membrane block consisting of the screen plate unit 21 and membrane filaments threaded thereto to be firmly fixed, thereby improving the stability and reliability of the overall product structure.
Further, in the present embodiment, the air intake holes 46 are provided obliquely upward from the outside toward the inside of the aeration member 4. Such a design ensures that no air can escape to the lower port 45 of the aeration member 4 under hydraulic conditions.
Further, in this embodiment, two ends of the housing 1 are open, one end of the housing is provided with a water outlet member, and the other end is provided with an air inlet member; the water outlet member comprises a first end cover plate 17 covered at one end of the shell 1 and a water outlet port 18 arranged on the first end cover plate 17, and the water outlet port 18 is communicated with the water outlet layer 7; the air inlet component comprises a second end cover plate 19 which is covered on the other end of the shell 1, and an air inlet interface 20 which is arranged on the second end cover plate 19, wherein the air inlet interface 20 is communicated with the air inlet layer 8. The design optimizes the composition structure of the shell 1, the water outlet component and the air inlet component can be separated from the shell 1, so that the production and manufacture of the shell 1 are simpler, the shell 1 with different length specifications can be designed by combining the modularized screen plate units 21 according to the requirements of customers, the structure of the water outlet component and the air inlet component serving as end covers at two ends is unchanged, the water outlet component and the air inlet component are beneficial to being used in subsequent products with different specifications, the production cost is saved, and the production is more convenient, accurate and quick.
The foregoing disclosure is only illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (8)
1. A membrane bioreactor, which is characterized by comprising membrane wires and an aeration device; the membrane wire is provided with a hollow channel, one end of the hollow channel is closed, the other end of the hollow channel is open, and the aeration device is connected to the open end of the membrane wire; the aeration device comprises a shell with an opening at the upper end, a first screen plate, a second screen plate and an aeration member; the shell is internally provided with a baffle plate, the baffle plate divides the cavity of the shell into an upper cavity and a lower cavity, the first screen plate and the second screen plate are arranged in the upper cavity at intervals and are parallel to the baffle plate, the cavity between the first screen plate and the second screen plate is used as an injecting glue layer, the cavity between the second screen plate and the baffle plate is used as a water outlet layer, and the lower cavity is used as an air inlet layer; the first screen plate and the second screen plate are respectively provided with a plurality of screen holes for penetrating through the membrane wires, and the screen holes are uniformly arranged at intervals; a plurality of aeration members are uniformly arranged at intervals along the central line of the length direction of the shell; the aeration component is of a pipe fitting structure and is provided with an upper port and a lower port, and the aeration component sequentially penetrates through the air inlet layer, the water outlet layer and the glue injection layer from bottom to top; an air inlet hole is formed in the position of the aeration member in the air inlet layer; the open ends of the membrane wires sequentially penetrate through the sieve holes on the first sieve plate and the second sieve plate and extend into the water outlet layer; the membrane wires, the aeration member, the first screen plate, the second screen plate and the shell are fixed together in a sealing way through glue injection in the glue injection layer; the aeration component is of a stepped pipe fitting structure and comprises an upper pipe part, a middle pipe part and a lower pipe part which are connected in sequence, wherein a plurality of grooves for glue injection are uniformly formed in the pipe wall of the upper pipe part; the air inlet holes are arranged obliquely upwards from the outside to the inside of the aeration component.
2. The membrane bioreactor of claim 1, wherein the first screen plate and the second screen plate are formed by sequentially splicing a plurality of square screen plate units with the same size, and each screen plate unit is provided with a plurality of screen holes for penetrating through the membrane wires, and the screen holes are uniformly arranged in an array.
3. A membrane bioreactor as claimed in claim 2, characterized in that the bottom of the housing is provided with a water inlet which is in fit connection with the lower port, the central position of each of the screen plate units in the first screen plate is provided with a gas-liquid mixing outlet which is in fit connection with the upper port, the central position of each of the screen plate units in the second screen plate is provided with a first connecting hole through which the upper port can pass, and the partition plate is provided with a second connecting hole through which the lower port can pass.
4. A membrane bioreactor as claimed in claim 3, wherein the outer diameter of the upper tube portion is smaller than the outer diameter of the middle tube portion, which is smaller than the outer diameter of the lower tube portion.
5. The membrane bioreactor of claim 4, wherein the upper pipe part penetrates between the first screen plate and the second screen plate, the upper end of the upper pipe part is matched with the gas-liquid mixing outlet, and the lower end of the upper pipe part is matched with the first connecting hole; the middle pipe part penetrates through the space between the second screen plate and the partition plate; the lower pipe portion penetrates through the space between the partition plate and the bottom of the shell, the upper end of the lower pipe portion is matched with the second connecting hole and sealed, and the lower end of the lower pipe portion is matched with the water inlet and sealed.
6. A membrane bioreactor according to claim 4, wherein a baffle is arranged at the joint of the middle pipe part and the lower pipe part, and the outer diameter of the baffle is larger than the inner diameter of the second connecting hole.
7. A membrane bioreactor as claimed in claim 1, wherein the housing is open at both ends, wherein one end is provided with a water outlet member and the other end is provided with an air inlet member; the water outlet component comprises a first end cover plate and a water outlet interface, the first end cover plate is covered at one end of the shell, the water outlet interface is arranged on the first end cover plate, and the water outlet interface is communicated with the water outlet layer; the air inlet component comprises a second end cover plate and an air inlet interface, wherein the second end cover plate is covered on the other end of the shell, the air inlet interface is arranged on the second end cover plate, and the air inlet interface is communicated with the air inlet layer.
8. The membrane bioreactor of claim 1, wherein the inner edge of the upper opening of the housing is provided with a first clamping position which is clamped with the first screen plate; and a second clamping position which is clamped with the second screen plate is arranged on the inner wall of the shell.
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| CN201710701187.1A CN107285459B (en) | 2017-08-16 | 2017-08-16 | Membrane bioreactor |
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| CN201710701187.1A CN107285459B (en) | 2017-08-16 | 2017-08-16 | Membrane bioreactor |
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| CN107285459B true CN107285459B (en) | 2024-05-03 |
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