CN112694167B - Membrane bioreactor for sewage treatment - Google Patents
Membrane bioreactor for sewage treatment Download PDFInfo
- Publication number
- CN112694167B CN112694167B CN202110072957.7A CN202110072957A CN112694167B CN 112694167 B CN112694167 B CN 112694167B CN 202110072957 A CN202110072957 A CN 202110072957A CN 112694167 B CN112694167 B CN 112694167B
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- box body
- pipe
- water inlet
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- liquid
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- 239000012528 membrane Substances 0.000 title claims abstract description 86
- 239000010865 sewage Substances 0.000 title claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 239000007788 liquid Substances 0.000 claims abstract description 88
- 238000005273 aeration Methods 0.000 claims abstract description 28
- 238000005192 partition Methods 0.000 claims description 39
- 238000007667 floating Methods 0.000 claims description 16
- 238000004891 communication Methods 0.000 claims description 13
- 238000004065 wastewater treatment Methods 0.000 claims 9
- 230000004907 flux Effects 0.000 abstract description 14
- 239000002245 particle Substances 0.000 abstract description 10
- 239000007789 gas Substances 0.000 description 37
- 239000010802 sludge Substances 0.000 description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- 238000003466 welding Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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Classifications
-
- 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
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Activated Sludge Processes (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to the technical field of sewage treatment, in particular to a membrane bioreactor for sewage treatment, which comprises a bioreactor, wherein the bioreactor comprises a first box body, a second box body is arranged in the first box body, a membrane component is arranged in the second box body, a water inlet is arranged at the outer side of the second box body, a water inlet pipe is arranged in the first box body, a mudguard is arranged in the first box body, a pipe orifice of the water inlet pipe is communicated with the water inlets through a snake-shaped channel formed between the mudguards, an aeration pipeline is arranged at one end of the snake-shaped channel, a first liquid area is arranged in the first box body, the part above the first liquid area in the first box body is a gas area, a switch unit is arranged outside the first box body, the membrane bioreactor for sewage treatment reduces the influence of particles and gas on the membrane flux, and under the same suction force of a water pump, the sewage flows into the outside from the membrane component more quickly, and simultaneously bubbles on the liquid surface are eliminated.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to a membrane bioreactor for sewage treatment.
Background
A membrane bioreactor is a novel water treatment technology combining a membrane separation unit and a biological treatment unit, a membrane component is used for replacing a terminal secondary sedimentation tank of the traditional biological treatment technology, the high active sludge concentration is kept in the bioreactor, the biological treatment organic load is improved, the occupied area of a sewage treatment facility is reduced, and the residual sludge amount is reduced by keeping low sludge load. However, in use, on one hand, the air bubbles generated by aeration contact with the membrane surface to reduce the flux of the membrane, and on the other hand, with the increase of the use time, the particles, colloidal particles or solute macromolecules contacting with the membrane are adsorbed and deposited on the membrane surface and in the membrane pores through the physical, chemical, biological and mechanical effects and the accumulation of microorganisms on the water interface of the membrane to cause the effective pore size of the membrane to be reduced or even blocked, so that the flux of the membrane is greatly reduced, the resistance loss is greatly improved, and the membrane bioreactor is influenced to reduce the flux of the membrane in use.
Disclosure of Invention
Aiming at the defects of the prior art and overcoming the defects of the prior art, the invention aims to provide a membrane bioreactor for sewage treatment and solve the problem that the membrane bioreactor is influenced by the reduction of membrane flux in use.
The technical scheme is that the membrane bioreactor for sewage treatment comprises a bioreactor, wherein the bioreactor comprises a first box body, the interior of the first box body is a cavity area, a partition plate used for dividing the first box body into a left part and a right part is arranged in the first box body, a through hole is formed in the partition plate, a second box body, the interior of which is the cavity area, is arranged on one side of the partition plate in the first box body, a membrane assembly is arranged in the second box body, the membrane assembly is communicated with a water pump outside the first box body through a water outlet pipe, a water inlet is arranged on the outer side of the second box body, water outlets are arranged on the inner side of the second box body, the water outlets are communicated with the water inlets through circulation pipes to form a structure that water flows into the second box body through the water outlets and drives the water flow at the membrane assembly to rotate, and a communication port communicated with the first box body is arranged above the water inlet, the water inlet pipe is arranged in the first box body, a splash guard is arranged between the pipe orifice of the water inlet pipe and the water inlet in the first box body, the water inlet pipe and the splash guard are positioned at the other side of the partition plate, the pipe orifice of the water inlet pipe is communicated with the water inlets through a snake-shaped channel and a through hole which are formed among the splash guards, an aeration pipeline is arranged at one end of the snake-shaped channel far away from the water inlets, the aeration pipeline is positioned at the bottom end of the first box body, a first liquid area used for containing liquid is arranged in the first box body, the upper liquid surface of the first liquid area is positioned between the water inlet and the communication port, a gas area filled with positive pressure gas generated by the fact that gas flowing out of the aeration pipeline floats out of the upper liquid surface of the first liquid area and then is matched with the first box body, the second box body and the first liquid area is externally provided with a switch unit used for enabling the gas area to be communicated with the outside through positive pressure, the switch unit is communicated with the gas area, and the through hole is in contact with the first liquid area and the gas area.
Preferably, each of the mudguards is arranged in a cross manner in the vertical direction, an upper surface of each of the mudguards is inclined downward toward the opposite side mud guard, and a lower surface of each of the mudguards is inclined upward toward the opposite side mud guard.
Preferably, the switch unit comprises a first pipe and a second pipe with one-way openings, the second pipe is installed in the first pipe in a reverse buckling mode, a second liquid area for containing liquid is arranged in the first pipe, a part, located below the liquid level of the second liquid area, of the second pipe is provided with a circulation port communicated with the two sides of the inner side and the outer side of the second pipe, the part, located in the second pipe, of the first pipe is communicated with the gas area through a communication pipe, and the part, located at the bottom of the first pipe, of one end of the communication pipe is located above the liquid level of the second liquid area.
Preferably, the part of each circulation pipe in the second box body is in an arc-shaped structure, and a tangent line at each water outlet is surrounded to form an annular structure.
Preferably, a partition plate is fixedly connected to a part of each fender located at one side, a partition plate is fixedly connected to a part of each fender located at the other side, the partition plate is fixedly connected with the inner wall of the first box body, and each fender, the partition plate and the inner wall of the first box body are matched to form a serpentine channel.
Preferably, the partition board and the inner wall of the first box body enclose a third box body with a cavity area inside, the third box body is positioned at one side of the partition board far away from the mudguard, the upper side of the partition board is provided with a first hole, the first hole is positioned in the gas zone, the lower side of the partition board is provided with a second hole, the second hole is positioned in the first liquid zone, a first valve is arranged on the water inlet pipe, a handle of the first valve is rotatably connected with one end of the connecting rod, the other end of the connecting rod is provided with a floating block which floats on the upper liquid level of the first liquid area, the water inlet pipe, the first valve and the floating block are positioned in a third box body, a mark is arranged between the water inlet and the communicating port of the third box body, the height of the mark is lower than that of the first hole and the communicating port, and a structure that the first valve is closed when the first liquid area is contacted with the mark and the first valve is opened when the first liquid area is not contacted with the mark is formed.
Preferably, the aeration pipeline is provided with a check valve, and one end of the aeration pipeline sequentially penetrates through the third box body and the second hole and is positioned below the mud guards.
Preferably, a lantern ring is installed in the first box body, and the lantern ring is covered on the connecting rod.
Preferably, the second hole is in contact with the bottom surface of the first box body, a drain outlet is arranged at the bottom end of the third box body, and a second valve is arranged on the drain outlet.
Preferably, the height of each water inlet is higher than that of each water outlet, the vertical length of each water outlet is greater than the transverse length of each water outlet, and each water outlet is tightly attached to the membrane module.
The invention provides a membrane bioreactor for sewage treatment, which has the following beneficial effects compared with the prior art:
1. the utility model discloses a sewage treatment device, including the aeration pipeline, the aeration pipeline flows out, the membrane module is located to be convenient for through snakelike passageway granule deposit, be convenient for sewage through the delivery port is rotatory in membrane module department, make granule and membrane face separation, both prevent that membrane flux from receiving the influence, also reduce membrane pollution, prolong the life of membrane module, make the oxygen that the aeration pipeline flows out keep apart with the membrane module through the division board, reduce the influence of gas to membrane flux, the positive pressure in gas district is to the pressure in first liquid district simultaneously, under the same suction of water pump, sewage flows into the external world through the membrane module in faster following the second box, make membrane flux increase, furthermore, under the positive pressure effect in gas district, eliminate the bubble of liquid level on the first liquid district, through the switch unit, make the gas district be in the positive pressure environment on the one hand, on the other hand, prevent that the positive pressure in the first box is too big.
Drawings
Fig. 1 is a schematic front view of the present invention.
FIG. 2 is a schematic cross-sectional view taken along the line A-A of the present invention.
FIG. 3 is a schematic cross-sectional view taken along the direction B-B of the present invention.
FIG. 4 is an enlarged cross-sectional view taken along the direction C-C of the present invention.
FIG. 5 is an enlarged view of the direction D-D of the present invention.
In the figure: the device comprises a first box body 1, a second box body 2, a membrane assembly 3, a water outlet pipe 4, a water inlet pipe 5, a water inlet 6, a water outlet 7, a circulation pipe 8, a communication port 9, a fender 10, a serpentine channel 11, an aeration pipeline 12, a first liquid area 13, a gas area 14, a switch unit 15, a first pipe 15.1, a second pipe 15.2, a circulation port 15.3, a communication pipe 15.4, a second liquid area 15.5, a partition plate 16, a through hole 17, a check valve 18, a partition plate 19, a third box body 20, a first hole 21, a second hole 22, a first valve 23, a handle 23.1, a connecting rod 24, a floating block 25, a mark 26, a lantern ring 27, a sewage draining outlet 28 and a second valve 29.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present invention, and in the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance in the description of the present invention, it being noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention will be described in further detail below with reference to specific embodiments and with reference to the attached drawings.
The first embodiment is as follows:
referring to fig. 1-5, the present invention provides a technical solution: a membrane bioreactor for sewage treatment comprises a bioreactor, wherein the bioreactor comprises a first box body 1 with a cavity area inside, a partition plate 16 for dividing the first box body 1 into a left part and a right part is arranged in the first box body 1, a through hole 17 is formed in the partition plate 16, a second box body 2 with a cavity area inside is arranged on one side of the partition plate in the first box body 1, a round hole is formed in the upper side wall of the first box body 1, the first box body 1 is in bolted connection with the second box body 2 at the round hole, a sealing ring is clamped at the joint of the first box body 1 and the second box body 2, a membrane assembly 3 is arranged in the second box body 2, the membrane assembly 3 is communicated with a water pump outside the first box body 1 through a water outlet pipe 4, sewage flows into the outside after passing through the membrane assembly 3 and the water outlet pipe 4 by the suction force of the water pump, a water inlet 6 is arranged at the outer side of the second box body 2, a water outlet 7 is arranged at the inner side of the second box body 2, the water outlets 7 are communicated with the water inlets 6 through a circulating pipe 8 to form a structure that water flows through the water outlets 7 to enter the second box body 2 and drives water flow at the membrane component 3 to rotate, the second box body 2 is provided with communication ports 9 communicated with the first box body 1 above the water inlets 6, four communication ports 9 are arranged on the side wall of the second box body 2 in an annular shape, each communication port 9 is tightly attached to the upper surface of the first box body 1, a water inlet pipe 5 is arranged in the first box body 1, the water inlet pipe 5 is fixed with the side wall of the first box body 1 in a seamless welding manner, a splash guard 10 is arranged between the pipe orifice of the water inlet pipe 5 and the water inlets 6 in the first box body 1, the water inlet pipe 5 and the splash guard 10 are positioned at the other side of a partition plate 16, the pipe orifice of the water inlet pipe 5 is communicated with the water inlets 6 through a snake-shaped channel 11 and a through hole 17 formed between the splash guards 10, and an aeration pipeline 12 is arranged at one end of the snake-shaped channel 11 far away from the water inlets 6, the aeration pipeline 12 is positioned at the bottom end of the first box body 1, the aeration pipeline 12 is fixed with the side wall of the first box body 1 in a seamless welding way, a first liquid area 13 for containing liquid is arranged in the first box body 1, the upper liquid surface of the first liquid area 13 is positioned between the water inlet 6 and the communicating port 9, the part above the first liquid area 13 in the first box body 1 is a gas area 14 filled with positive pressure gas generated by the cooperation of the gas flowing out from the aeration pipeline 12 and floating out of the upper liquid surface of the first liquid area 13 and the first box body 1, the second box body 2 and the first liquid area 13, a switch unit 15 for enabling the gas area 14 to be communicated with the outside through positive pressure is arranged outside the first box body 1, the switch unit 15 is communicated with the gas area 14, the through hole 17 is contacted with the first liquid area 13 and the gas area 14, when in use, sewage flows into the first box body 1 in the bioreactor from the water inlet pipe 5, the aeration pipeline 12 is filled with oxygen, pollutants in sewage are removed by activated sludge in mixed liquid in a bioreactor, then the sewage enters a second box body 2 through a through hole 17, a circulating pipe 8 and a water outlet 7 from a water inlet 6 through a snake-shaped channel 11 to be precipitated by most particles in the sewage, the sewage rotates at a membrane component 3 in the second box body 2, the sewage is treated by the membrane component 3 under the suction force of a water pump and flows into the outside through a water outlet pipe 4, when a small part of particles are adsorbed on the membrane surface, the particles are separated from the membrane surface by water flow rotating in the second box body 2, the membrane flux is prevented from being influenced, the membrane pollution is reduced, the service life of the membrane component 3 is prolonged, oxygen flowing out of an aeration pipeline 12 is isolated from the membrane component 3 through a partition plate 16, the influence of gas on the membrane flux is reduced, and meanwhile, the pressure of positive pressure of a gas zone 14 on a first liquid zone 13, under the same suction force of the water pump, sewage flows into the outside from the second tank 2 through the membrane module 3 more quickly, so that the membrane flux is increased, in addition, bubbles on the liquid surface of the first liquid area 13 are eliminated under the positive pressure action of the gas area 14, and when the positive pressure of the gas area 14 is larger than a certain value, the switch unit 15 is opened to discharge a part of gas.
Furthermore, the mud guards 10 are arranged in a crossed manner in the vertical direction, the upper surface of each mud guard 10 inclines downwards towards the opposite side mud guard 10, the lower surface of each mud guard 10 inclines upwards towards the opposite side mud guard 10, and the vertically distributed mud guards 10 facilitate the oxygen in the aeration pipeline 12 to rise and fully contact with the sewage and facilitate the particle precipitation in the sewage.
Furthermore, a partition plate 16 is welded and fixed to the portion, located at one side, of each fender 10, a partition plate 19 is welded and fixed to the portion, located at the other side, of each fender 10, the partition plate 19 is welded and fixed to the inner wall of the first box 1, each fender 10 is matched with the partition plate 16, the partition plate 19 and the inner wall of the first box 1 to form a serpentine channel 11, the partition plate 16 is welded and fixed to the inner wall of the first box 1, and the front side and the rear side of each fender 10 are in seamless contact with the inner wall of the first box 1.
Furthermore, a third box 20 with a cavity area inside is enclosed by the partition plate 19 and the inner wall of the first box 1, the third box 20 is located at one side of the partition plate 19 far away from the fender 10, the upper side of the partition plate 19 is provided with a first hole 21, the first hole 21 is located in the gas area 14, the first hole 21 is tightly attached to the upper surface of the first box 1, the lower side of the partition plate 19 is provided with a second hole 22, the second hole 22 is located in the first liquid area 13, the water inlet pipe 5 is provided with a first valve 23, the first valve 23 is used for opening and closing the water inlet pipe 5, a handle 23.1 of the first valve 23 is rotatably connected with one end of a connecting rod 24, the other end of the connecting rod 24 is welded and fixed with a floating block 25, the floating block 25 floats on the upper liquid surface of the first liquid area 13, the water inlet pipe 5, the first valve 23 and the floating block 25 are located in the third box 20, the third box 20 is provided with a mark 26 between the water inlet 6 and the communication port 9, and the mark 26 is lower than the first hole 21, The height of the communication port 9 is such that when the first liquid area 13 contacts the mark 26, the upper liquid level of the first liquid area 13 is equal to the height of the mark 26, the floating block 25 drives the handle 23.1 to rotate upwards, so that the handle 23.1 is perpendicular to the axis of the water inlet pipe 5, so that the first valve 23 is closed, i.e. the water inlet pipe 5 is closed, when the first liquid area 13 does not contact the mark 26, the upper liquid level of the first liquid area 13 is lower than the height of the mark 26, the floating block 25 drives the handle 23.1 to rotate downwards, so that the first valve 23 is opened, i.e. the water inlet pipe 5 is opened, so that a structure is formed, in which the first valve 23 is closed when the first liquid area 13 contacts the mark 26, and the first valve 23 is opened when the first liquid area 13 does not contact the mark 26, by the cooperation of the floating block 25 and the first valve 23, the upper liquid level of the first liquid area 13 is kept below the mark 26, so that the gas area 14 has enough space, the sewage can flow into the second box body 2 only from the second hole 22, through the serpentine channel 11, through the through hole 17 and the circulating pipe 8, and the gas area 14 is communicated with each other through the first hole 21, the through hole 17 and the communication port 9.
Furthermore, the aeration pipe 12 is provided with a check valve 18 for preventing the pressure of the first liquid zone 13 from causing the gas in the aeration pipe 12 to flow backwards, and one end of the aeration pipe 12 sequentially passes through the side wall of the third box 20 and the part of the second hole 22 and is positioned below each splash guard 10, so that the aeration pipe 12 can provide oxygen for the third box 20 and the serpentine channel 11.
Further, install lantern ring 27 in the first box 1, lantern ring 27 dustcoat in connecting rod 24, lantern ring 27 is fixed through branch and third box 20 inside wall, makes floating block 25 remove in the certain limit through lantern ring 27, prevents that the fluctuation of liquid level from driving floating block 25 and remove on a large scale on first liquid district 13 to make first valve 23 close, does not influence connecting rod 24 simultaneously because of the high change of floating block 25 removes at the horizontal direction.
Further, the second hole 22 contacts with the bottom surface of the first tank 1, a drain outlet 28 is installed at the bottom end of the third tank 20, a second valve 29 is installed at the drain outlet 28, and sludge in the first tank 1 is conveniently discharged through the second valve 29.
Further, the switch unit 15 includes a first tube 15.1 and a second tube 15.2 with one-way openings, the second tube 15.2 is fixed in the first tube 15.1 by welding, a second liquid area 15.5 for containing liquid is arranged in the first tube 15.1, a part of the second tube 15.2 under the liquid level of the second liquid area 15.5 is provided with a flow port 15.3 communicating the inner side and the outer side of the second tube 15.2, four flow ports 15.3 are distributed on the side wall of the second tube 15.2 in an annular shape, a part of the first tube 15.1 in the second tube 15.2 is communicated with the gas area 14 through a communicating tube 15.4, a part of one end of the communicating tube 15.4 passing through the bottom of the first tube 15.1 is positioned above the second liquid area 15.5, when the positive pressure of the gas area 14 is larger than a certain value, the liquid in the second tube 15.2 flows out of the second tube 15.2 through each flow port 15.3, the gas flows into the external environment through the flow port 15.3, on the other hand, so that the gas area is in the external environment 14, when the positive pressure value is too large, the positive pressure gas flows into a part of the external environment, so that the excessive positive pressure in the first box body 1 is prevented.
Furthermore, the part of each circulation pipe 8 positioned in the second box 2 is in an arc-shaped structure, and the tangent lines at each water outlet 7 enclose an annular structure, when the sewage in the second box 2 flows into the outside from the water outlet pipe 4, the liquid level in the second box 2 is lowered, the sewage in the first box 1 enters the second box 2 through the circulation pipe 8, and the sewage flowing out from the water outlet 7 can rotate in the second box 2 through the arc-shaped structure and the annular structure.
Furthermore, the height of each water inlet 6 is higher than that of each water outlet 7, the vertical length of each water outlet 7 is greater than the transverse length of each water outlet 7, each water outlet 7 is tightly attached to the membrane module 3, wherein the circulating pipe 8 and the second box body 2 are of an integrated structure, six circulating pipes 8, six water inlets 6 and six water outlets 7 are uniformly distributed in an annular shape along the axis of the second box body 2, sewage flowing into the second box body 2 through the water outlets 7 rotates at the position tightly attached to the membrane module 3, so that a structure that water flows through each water outlet 7, enters the second box body 2 and drives water flow at the membrane module 3 to rotate is formed, membrane surfaces of the membrane modules 3 are convenient to be washed, and particles are separated from the membrane surfaces.
When in use, the activated sludge in the mixed liquid in the bioreactor is positioned in the third box body 20 and below the mudguard 10, after sewage enters the bioreactor, pollutants in the sewage are removed by the activated sludge in the mixed liquid in the bioreactor, the particles in the sewage are precipitated conveniently through the serpentine channel 11, the sewage is rotated conveniently at the membrane component 3 through the water outlet 7, the particles are separated from the membrane surface, the membrane flux is prevented from being influenced and the membrane pollution is reduced, the service life of the membrane component 3 is prolonged, oxygen flowing out of the aeration pipeline 12 is isolated from the membrane component 3 through the partition plate 16, the influence of gas on the membrane flux is reduced, meanwhile, the positive pressure of the gas zone 14 on the pressure of the first liquid zone 13 is utilized, under the same suction force of the water pump, the sewage flows into the outside from the second box body 2 through the membrane component 3 more quickly, the membrane flux is increased, and in addition, bubbles on the liquid surface in the first liquid region 13 are eliminated by the positive pressure in the gas region 14, and the gas region 14 is brought into a positive pressure environment by the switch means 15, while the positive pressure in the first tank 1 is prevented from becoming excessively high.
The present invention has been described in detail with reference to the specific embodiments and examples, but these are not intended to limit the present invention. Many variations and modifications may be made by one of ordinary skill in the art without departing from the principles of the present invention, which should also be considered as within the scope of the present invention.
Claims (10)
1. A membrane bioreactor for sewage treatment, including bioreactor, its characterized in that: the bioreactor comprises a first box body (1) with a cavity area inside, a partition plate (16) used for dividing the first box body (1) into a left part and a right part is arranged in the first box body (1), a through hole (17) is formed in the partition plate (16), a second box body (2) with a cavity area inside is arranged on one side of the partition plate in the first box body (1), a membrane assembly (3) is installed in the second box body (2), the membrane assembly (3) is communicated with a water pump outside the first box body (1) through a water outlet pipe (4), a water inlet (6) is arranged on the outer side of the second box body (2), water outlets (7) are arranged on the inner side of the second box body (2), each water outlet (7) is communicated with each water inlet (6) through a circulating pipe (8), and a structure that water flow enters the second box body (2) through each water outlet (7) and drives the water flow at the membrane assembly (3) to rotate is formed, the second box body (2) is provided with a communicating port (9) communicated with the first box body (1) above the water inlet (6), a water inlet pipe (5) is arranged in the first box body (1), a mudguard (10) is arranged between the pipe orifice of the water inlet pipe (5) and the water inlet (6) in the first box body (1), the water inlet pipe (5) and the mudguard (10) are positioned at the other side of the partition plate (16), the pipe orifice of the water inlet pipe (5) is communicated with the water inlet (6) through a snake-shaped channel (11) and a through hole (17) formed between the mudguards (10), an aeration pipeline (12) is arranged at one end of the snake-shaped channel (11) far away from the water inlet (6), the aeration pipeline (12) is positioned at the bottom end of the first box body (1), a first liquid area (13) used for containing liquid is arranged in the first box body (1), the upper liquid level of the first liquid area (13) is located between the water inlet (6) and the communication port (9), the part above the first liquid area (13) in the first box body (1) is a gas area (14) filled with positive pressure gas generated by matching the aeration pipeline (12) with the first box body (1), the second box body (2) and the first liquid area (13) after the gas flows out of the upper liquid level of the first liquid area (13), a switch unit (15) used for enabling the gas area (14) to be communicated with the outside through positive pressure is installed outside the first box body (1), the switch unit (15) is communicated with the gas area (14), and the through hole (17) is in contact with the first liquid area (13) and the gas area (14).
2. The membrane bioreactor for wastewater treatment of claim 1, wherein: the mud guards (10) are distributed in a crossed arrangement in the vertical direction, the upper surface of each mud guard (10) inclines downwards towards the direction of the opposite side mud guard (10), and the lower surface of each mud guard (10) inclines upwards towards the direction of the opposite side mud guard (10).
3. The membrane bioreactor for wastewater treatment of claim 1, wherein: the switch unit (15) comprises a first pipe (15.1) with a one-way opening and a second pipe (15.2), the second pipe (15.2) is installed in the first pipe (15.1) in a reverse buckling mode, a second liquid area (15.5) containing liquid is arranged in the first pipe (15.1), a part, located below the liquid level of the second liquid area (15.5), of the second pipe (15.2) is provided with a flow port (15.3) communicated with the inner side and the outer side of the second pipe (15.2), a part, located in the second pipe (15.2), of the first pipe (15.1) is communicated with a gas area (14) through a communicating pipe (15.4), and a part, located above the liquid level of the second liquid area (15.5), of one end of the communicating pipe (15.4) penetrates through the bottom of the first pipe (15.1).
4. The membrane bioreactor for wastewater treatment of claim 1, wherein: the part of each circulation pipe (8) positioned in the second box body (2) is in an arc-shaped structure, and the tangent lines at the water outlets (7) enclose an annular structure.
5. The membrane bioreactor for wastewater treatment of claim 2, characterized in that: the part of each fender (10) located at one side is fixedly connected with a partition plate (16), the part of each fender (10) located at the other side is fixedly connected with a partition plate (19), the partition plate (19) is fixedly connected with the inner wall of the first box body (1), and each fender (10), the partition plate (16), the partition plate (19) and the inner wall of the first box body (1) are matched to form a snake-shaped channel (11).
6. The membrane bioreactor for wastewater treatment of claim 5, wherein: the baffle plate (19) and the inner wall of the first box body (1) enclose a third box body (20) with a cavity area inside, the third box body (20) is positioned at one side of the baffle plate (19) far away from the mudguard (10), a first hole (21) is formed in the upper side of the baffle plate (19), the first hole (21) is positioned in the gas area (14), a second hole (22) is formed in the lower side of the baffle plate (19), the second hole (22) is positioned in the first liquid area (13), a first valve (23) is installed on the water inlet pipe (5), a handle (23.1) of the first valve (23) is rotatably connected with one end of a connecting rod (24), a floating block (25) is installed at the other end of the connecting rod (24), the floating block (25) floats on the upper liquid surface of the first liquid area (13), the water inlet pipe (5), the first valve (23) and the floating block (25) are positioned in the third box body (20), the third box body (20) is provided with a mark (26) between the water inlet (6) and the communicating port (9), the height of the mark (26) is lower than the height of the first hole (21) and the communicating port (9), and a structure that the first valve (23) is closed when the first liquid area (13) is in contact with the mark (26) and the first valve (23) is opened when the first liquid area (13) is not in contact with the mark (26) is formed.
7. The membrane bioreactor for wastewater treatment of claim 6, wherein: the aeration pipeline (12) is provided with a check valve (18), and one end of the aeration pipeline (12) sequentially penetrates through the third box body (20) and the second hole (22) and is positioned below each fender (10).
8. The membrane bioreactor for wastewater treatment of claim 6, wherein: a lantern ring (27) is arranged in the first box body (1), and the lantern ring (27) is covered on the connecting rod (24).
9. The membrane bioreactor for wastewater treatment of claim 6, wherein: the second hole (22) is in contact with the bottom surface of the first box body (1), a sewage draining outlet (28) is arranged at the bottom end of the third box body (20), and a second valve (29) is arranged on the sewage draining outlet (28).
10. The membrane bioreactor for wastewater treatment of claim 4, wherein: the height of each water inlet (6) is higher than that of each water outlet (7), the vertical length of each water outlet (7) is larger than the transverse length of each water outlet, and each water outlet (7) is tightly attached to the membrane module (3).
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