Pulse type large-small gas aeration device and membrane bioreactor

Abstract

The utility model discloses a pulse type large and small gas aeration device and a membrane bioreactor (MBR), and relates to the technical field of water treatment, and the pulse type large and small gas aeration device is arranged at the bottom of an immersed ultramicro filter membrane component of the MBR. The pulse type large-small gas aeration device is provided with the large-flow pulse second aeration holes and the small-flow first aeration holes, and by combining impact of large gas flow and small gas flow, a membrane assembly of a membrane bioreactor can be effectively scoured, and pollution of the membrane assembly is controlled; the interval time of aeration is shorter than the interval time of pulse aeration, that is, compared with a traditional pulse type aeration device, the aeration interval time is shortened, sludge deposition on a membrane assembly is effectively relieved, meanwhile, the aeration device is prevented from being blocked by sludge, and the cleaning and maintenance cost is saved; according to the pulse aeration device, the large-flow pulse aeration effect of a traditional pulse aeration device and the small-flow aeration process with the shorter aeration interval time can be achieved, the aeration effect is improved, and meanwhile the energy consumption cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a pulse-type large and small gas aeration device and a membrane bioreactor. Background Art

[0002] MBR (Membrane Bioreactor) utilizes ultra-microfiltration membranes to intercept activated sludge, effectively separating the solid-liquid mixture from the sludge-water mixture, replacing traditional secondary sedimentation tanks. The MBR process is widely used in municipal and industrial wastewater treatment, offering numerous advantages, including high system stability, excellent effluent quality, a small footprint, and a high degree of automation.

[0003] The ultra-microfiltration membrane components of the membrane bioreactor are immersed in the membrane tank. The negative pressure suction of the water production pump draws the filtered water from the hollow fiber membrane filaments into the water production tank. After the membrane filtration has been running for a certain period of time, activated sludge or pollutants continue to accumulate on the surface of the membrane filaments, causing an increase in the transmembrane pressure difference, which in turn affects the water production performance of the MBR membrane. To alleviate the problem of rapid fouling and clogging of the MBR membrane, an aeration device is usually added to the bottom of the MBR reactor. The aeration causes the membrane filaments to vibrate, shaking off pollutants on the membrane surface and achieving a clean membrane filament effect.

[0004] Factors that affect aeration efficiency include aerator structure, aeration flow rate, number of aeration holes, and hole size. The aerator types commonly used in MBR reactors are microporous aeration, perforated tube aeration, and pulse aeration. Aeration modes include continuous aeration and intermittent aeration.

[0005] Microporous aerators typically have pore sizes ranging from 0 to 200 μm, producing a large number of tiny bubbles. The rising bubbles can scrub the membrane surface, but the micropores can easily become clogged by suspended matter or microorganisms, affecting aeration efficiency and increasing the cost of cleaning, maintenance, and replacement. Perforated aerators typically have pore sizes ranging from 3 to 10 mm, producing larger bubbles. However, when the sludge concentration in the membrane tank is high, the perforated tube aeration holes can become clogged, leading to sludge accumulation on the membrane fibers. Continuous aeration with these two types of aerators consumes a high amount of energy; intermittent aeration requires valve control, increasing investment in equipment and automated control. To further reduce energy consumption and costs, energy-efficient and efficient pulsed aeration devices are becoming the mainstream aeration technology for MBR membrane modules.

[0006] Pulse aeration devices, by generating intermittent, high-flow bubbles, can reduce clogging and extend their service life. Furthermore, the pulsed airflow provides a stronger cleansing effect on the membrane surface, helping to control membrane fouling. However, due to the long intervals between high-flow bubbles in traditional pulse aeration devices, sludge can accumulate near the aeration holes during prolonged operation of the MBR reactor, eventually clogging them and causing the aerator to fail, which in turn affects the water production performance of the membrane fibers. Therefore, the existing technology still has shortcomings and deficiencies. Utility Model Content

[0007] The purpose of the utility model is to provide a pulsed large and small air aeration device and a membrane bioreactor, which solves the technical problem that the traditional pulsed aeration device has limited aeration effect and cannot effectively alleviate the sludge deposition on the membrane assembly, thereby affecting the water production performance of the membrane fibers.

[0008] To achieve the above-mentioned purpose, the present invention provides a pulsed aeration device comprising:

[0009] An outer shell is formed with a gas collecting chamber therein, and a first aeration hole is provided on the outer shell, the first aeration hole is communicated with the gas collecting chamber, and the first aeration hole is used to aerate small-flow bubbles;

[0010] An inner shell is arranged in the gas collecting chamber and connected to the outer shell, and a plurality of aeration chambers are arranged inside the inner shell;

[0011] A plurality of aeration components, each of which is disposed in the aeration chamber and includes a connector and an aeration tube. The connector is connected to the inner shell, a gas collecting cavity is formed inside the connector, and the aeration tube is disposed in the gas collecting cavity and connected to the outer shell;

[0012] Wherein, a second aeration hole is formed at the connection between the aeration tube and the outer shell, for aerating large-flow bubbles.

[0013] Preferably, the vertical position height of the first aeration hole is higher than the bottom height of the aeration tube, and the vertical position height of the first aeration hole is lower than the top height of the gas collecting chamber.

[0014] Preferably, a sewage outlet is provided at the bottom of the connecting piece, and the sewage outlet is communicated with the gas collecting chamber.

[0015] Preferably, the sewage outlet is located at the center of the bottom of the gas collecting chamber, and the size of the sewage outlet is smaller than the size of the second aeration hole.

[0016] Preferably, the outer shell includes a top plate and a plurality of first side plates, the top plate is connected to the first side plates, and the top plate and the plurality of first side plates form the air collecting chamber.

[0017] Preferably, it further comprises a plurality of air separation hoods, wherein the air separation hoods are arranged at the second aeration holes, and the air separation hoods include:

[0018] A plurality of baffles are fixedly connected to the top of the top plate, the baffles are vertically arranged, and the plurality of baffles are distributed in a ring array;

[0019] The cover plate is fixedly connected to the baffle plate and is located on a side of the baffle plate facing away from the top plate.

[0020] Preferably, an air inlet is provided on the outer shell, and the air inlet is communicated with the air collecting chamber.

[0021] Preferably, a plurality of first side holes are provided on the inner shell, and the first side holes connect the aeration chamber and the gas collecting chamber.

[0022] Preferably, a plurality of partitions are provided inside the inner shell, and the partitions are fixedly connected to the inner shell. The partitions divide the interior of the inner shell into the aeration chambers.

[0023] The utility model also provides a membrane bioreactor, comprising the pulse-type large and small gas aeration device described in any one of the above technical solutions.

[0024] Compared with the above-mentioned background technology, the pulse-type large and small air aeration device and membrane bioreactor provided by the present invention have a second aeration hole with a large flow pulse and a first aeration hole with a small flow. The impact of the large airflow and the small airflow is combined to improve the aeration effect, which can effectively flush the membrane assembly of the membrane bioreactor and control the pollution of the membrane assembly; the interval time of aeration is shorter than the interval time of pulse aeration, which shortens the aeration interval time, effectively alleviates the sludge deposition on the membrane assembly, and also avoids the aeration device being blocked by sludge, saving cleaning and maintenance costs; it can achieve the large-flow pulse aeration effect of the traditional pulse aeration device and the small-flow aeration process with a shorter aeration interval time, and has low energy consumption cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0026] Figure 1A front view of a pulsed large and small air aeration device provided by an embodiment of the present utility model;

[0027] Figure 2 A schematic diagram of the internal structure of the pulse-type large and small air aeration device provided by an embodiment of the utility model;

[0028] Figure 3 A schematic diagram of the internal structure of the pulse-type large and small air aeration device provided by an embodiment of the utility model from a top view;

[0029] Figure 4 A schematic side view of the internal structure of the pulsed large and small air aeration device provided by an embodiment of the utility model;

[0030] Figure 5 This is a three-dimensional cross-sectional view of a pulsed large and small air aeration device provided by an embodiment of the present utility model.

[0031] Figures 1 to 5 Reference numerals in the accompanying drawings: 10, outer shell; 11, top plate; 12, first side plate; 121, first aeration hole; 13, air collecting chamber; 14, air inlet; 20, inner shell; 21, second side plate; 211, first side hole; 22, aeration chamber; 23, partition; 30, aeration assembly; 31, connecting piece; 311, air collecting chamber; 312, sewage outlet; 32, aeration pipe; 321, second aeration hole; 40, air distributor hood; 41, baffle; 42, cover plate. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0034] The utility model provides a pulse-type large and small air aeration device and a membrane bioreactor, which have a second aeration hole 321 with a large flow pulse and a first aeration hole 121 with a small flow. The aeration effect is improved by combining the impact of the large airflow and the small airflow, and the membrane component can be effectively flushed. Compared with the traditional pulse-type aeration device, the aeration interval time is shortened, and the sludge deposition on the membrane component is effectively alleviated.

[0035] Please refer to Figures 1 to 5The pulse-type large and small air aeration device provided by the present invention includes an outer shell 10, an inner shell 20 and an aeration assembly 30.

[0036] Please refer to Figures 1 to 5 The outer shell 10 is generally in the shape of a rectangular parallelepiped with an open bottom, and includes a top plate 11 and a plurality of first side plates 12, wherein the top plate 11 is connected to the first side plates 12. A gas collecting chamber 13 is formed inside the outer shell 10, and the top plate 11 and the plurality of first side plates 12 enclose the gas collecting chamber 13.

[0037] Please refer to Figures 1 to 3 The outer shell 10 is provided with two air inlets 14 for supplying air to the air collecting chamber 13 inside the outer shell 10 . The two air inlets 14 are located on both sides of the outer shell 10 and are communicated with the air collecting chamber 13 . The air inlets 14 are provided on the first side plate 12 .

[0038] The outer shell 10 is provided with a plurality of first aeration holes 121 , which are connected to the air collecting chamber 13 and are used to release small-flow bubbles.

[0039] The inner shell 20 is arranged in the gas collecting chamber 13. The inner shell 20 is roughly rectangular and includes a plurality of second side plates 21 connected together. The inner shell 20 is fixedly connected to the top plate 11 in the outer shell 10, and the top of the second side plate 21 is connected to the top plate 11.

[0040] The interior of the inner shell 20 is divided into multiple aeration chambers 22. Specifically, the interior of the inner shell 20 is provided with multiple partitions 23, which are fixedly connected to the second side plate 21. The multiple partitions 23 divide the interior of the inner shell 20 to form multiple aeration chambers 22.

[0041] When the number of partitions 23 is N (N ≥ 1), the number of aeration chambers 22 formed is N + 1. In this embodiment, the number of partitions 23 is 6, and the number of aeration chambers 22 formed is 7. In other embodiments, the number of partitions 23 can be set according to actual needs and is not limited to this.

[0042] A plurality of first side holes 211 are provided on the inner shell 20 . The first side holes 211 are located on the second side plate 21 . The first side holes 211 connect the aeration chamber 22 and the gas collecting chamber 13 .

[0043] Please refer to Figures 1 to 5 The number of the aeration components 30 is multiple, and the multiple aeration components 30 are arranged in the aeration chamber 22 in a one-to-one correspondence. The aeration components 30 include a connector 31 and an aeration pipe 32.

[0044] The connecting member 31 is generally a cylindrical structure with an open top. The connecting member 31 is connected to the inner shell 20 , and a cylindrical gas collecting chamber 311 is formed inside the connecting member 31 .

[0045] The number of the gas collecting cavities 311 is consistent with the number of the first aeration holes 121 , the horizontal spacing between each first aeration hole 121 is the same, and the first aeration holes 121 are evenly distributed on the first side plate 12 .

[0046] The aeration pipe 32 is provided in the above-mentioned gas collecting chamber 311, and the aeration pipe 32 is connected to the outer shell 10. Specifically, the aeration pipe 32 is vertically arranged, and the top of the aeration pipe 32 is connected to the top plate 11. A second aeration hole 321 is formed at the connection between the aeration pipe 32 and the top plate 11. The second aeration hole 321 is used to expose large-flow, high-intensity bubbles.

[0047] A drain port 312 is provided at the bottom of the connector 31. This port communicates with the plenum chamber 311 and is used to drain sludge from the bottom of the chamber to prevent it from settling. The drain port 312 is located at the center of the bottom of the chamber 311 and has a smaller opening than the second aeration holes 321.

[0048] Please refer to Figures 1 to 5 The pulsed large and small air aeration device provided by the present invention further includes a plurality of air separation hoods 40, which are arranged one by one at the second aeration holes 321 and are arranged on the top plate 11 of the outer shell 10. The air separation hoods 40 can play an air separation role.

[0049] The distances between the gas distribution hoods 40 are the same, and the gas distribution hoods 40 are evenly distributed on the upper part of the top plate 11 .

[0050] The air distribution hood 40 includes a baffle 41 and a cover plate 42. The baffle 41 is vertically arranged and located at the second aeration hole 321. The baffle 41 is fixedly connected to the top plate 11. Multiple baffles 41 are arranged in a circular matrix. The cover plate 42 is fixedly connected to the baffle 41 and is located on the side of the baffle 41 facing away from the top plate 11.

[0051] With such arrangement, when the gas is discharged through the second aeration holes 321 , the multiple baffles 41 act as a diverter for the gas, and the cover plate 42 acts as a barrier, so that the gas is discharged from the gap between two adjacent baffles 41 , ensuring that the gas is discharged evenly in the horizontal plane, thereby achieving a gas separation effect.

[0052] The vertical position of the first aeration hole 121 is higher than the bottom height of the aeration tube 32 and lower than the top height of the gas collecting chamber 311. Within this range, intermittent aeration process can be achieved.

[0053] If the opening position of the first aeration hole 121 is higher than this height range, the aeration process of the first aeration hole 121 continues, and it is difficult to store gas in the gas collecting cavity 311, which directly leads to the failure of the pulse aeration process of the second aeration hole 321.

[0054] If the opening position of the first aeration hole 121 is lower than this height range, the gas flow and release process in the aeration device are no different from those of the pulse aeration device before the holes are opened, and no bubbles overflow from the first aeration hole 121, that is, the aeration process fails.

[0055] Under the same air intake conditions, the larger the size of the first aeration holes 121, the shorter the aeration interval. The larger the size of the first aeration holes 121, the lower the air pressure required for aeration, and the easier it is for gas to overflow from the first aeration holes 121.

[0056] Under the same air intake condition, the smaller the vertical distance between the first aeration hole 121 and the top of the gas collecting chamber 311 is, the shorter the aeration interval is.

[0057] The utility model also provides a membrane bioreactor, comprising the pulsed large and small gas aeration device provided by any of the above embodiments.

[0058] The working principle of the pulse-type large and small air aeration device provided by the utility model is as follows:

[0059] The pulse-type large and small gas aeration device is arranged at the bottom of the ultrafiltration membrane assembly of the membrane bioreactor. When in use, the ultrafiltration membrane assembly is immersed in water; the gas enters the gas collecting chamber 13 from the two air inlets 14, and a part of the gas enters the aeration chamber 22 through the first side hole 211. The gas in the aeration chamber 22 continuously enters the gas collecting cavity 311, and this part of the gas discharges the water in the gas collecting cavity 311 from the sewage outlet 312. When the liquid level in the gas collecting cavity 311 drops to the same level as the bottom of the aeration tube 32, under the influence of air pressure, the gas flows through the aeration tube 32 and rushes out to the second aeration hole 321, forming instantaneous pulse aeration, that is, the atmospheric aeration process; the other part of the gas is aerated into small-flow bubbles through the first aeration hole 121 in the gas collecting chamber 13, that is, the small-gas aeration process.

[0060] When the second aeration hole 321 experiences instantaneous air aeration, the gas pressure in the air collecting chamber 13 is released, resulting in no bubbles emerging from the first aeration hole 121. As the subsequent gas enters the interior of the air collecting chamber 13, the aeration process resumes, forming an intermittent aeration phenomenon. The time interval of aeration is shorter than the time interval of air aeration.

[0061] When the air intake reaches a certain level, the interval time of large aeration does not change much, and the interval time of small aeration gradually shortens. The pulse-type large and small aeration device combines large aeration and small aeration to achieve continuous flushing of the membrane components, which can effectively reduce the blockage of the aeration device and membrane components.

[0062] The pulse-type large and small air aeration device provided by the present invention has a second aeration hole 321 with a large flow rate pulse and a first aeration hole 121 with a small flow rate. Combined with the impact of the large airflow and the small airflow, the membrane assembly of the membrane bioreactor can be effectively flushed to control the pollution of the membrane assembly; the interval time of small aeration is shorter than the interval time of pulse aeration, that is, compared with the traditional pulse aeration device, the aeration interval time is shortened, which can effectively alleviate the sludge deposition on the membrane assembly, and also avoid the aeration device being blocked by sludge, saving cleaning and maintenance costs; by adjusting the air intake, the position and size of the aeration holes, the large flow rate pulse aeration effect of the traditional pulse aeration device and the small flow rate aeration process with a shorter aeration interval time can be achieved, the aeration effect is improved, and the energy consumption cost is reduced.

[0063] The membrane bioreactor includes all the technical features of the pulsed large and small gas aeration device, and can therefore solve the same technical problems and produce the same technical effects.

[0064] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0065] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A pulsed aeration device, characterized in that: include: An outer shell is formed with a gas collecting chamber therein, and a first aeration hole is provided on the outer shell, the first aeration hole is communicated with the gas collecting chamber, and the first aeration hole is used to aerate small-flow bubbles; An inner shell is arranged in the gas collecting chamber and connected to the outer shell, and a plurality of aeration chambers are arranged inside the inner shell; A plurality of aeration components, each of which is disposed in the aeration chamber and includes a connector and an aeration tube. The connector is connected to the inner shell, a gas collecting cavity is formed inside the connector, and the aeration tube is disposed in the gas collecting cavity and connected to the outer shell; Wherein, a second aeration hole is formed at the connection between the aeration tube and the outer shell, for aerating large-flow bubbles.

2. The pulsed large and small air aeration device according to claim 1, characterized in that: The first aeration hole is located at a height higher than the bottom of the aeration tube in the vertical direction, and is located at a height lower than the top of the gas collecting chamber in the vertical direction.

3. The pulsed large and small air aeration device according to claim 1, characterized in that: A sewage outlet is provided at the bottom of the connecting piece, and the sewage outlet is communicated with the gas collecting cavity.

4. The pulsed large and small air aeration device according to claim 3, characterized in that: The sewage outlet is located at the center of the bottom of the gas collecting chamber, and the size of the sewage outlet is smaller than the size of the second aeration hole.

5. The pulsed large and small air aeration device according to claim 1, characterized in that: The outer shell includes a top plate and a plurality of first side plates, the top plate is connected to the first side plates, and the top plate and the plurality of first side plates enclose the air collecting chamber.

6. The pulsed large and small air aeration device according to claim 5, characterized in that: It also includes a plurality of air separation hoods, which are arranged at the second aeration holes, and the air separation hoods include: A plurality of baffles are fixedly connected to the top of the top plate, the baffles are vertically arranged, and the plurality of baffles are distributed in a ring array; The cover plate is fixedly connected to the baffle plate and is located on a side of the baffle plate facing away from the top plate.

7. The pulsed large and small air aeration device according to claim 2, characterized in that: The outer shell is provided with an air inlet, which is communicated with the air collecting chamber.

8. The pulsed large and small air aeration device according to claim 1, characterized in that: The inner shell is provided with a plurality of first side holes, and the first side holes connect the aeration chamber and the gas collecting chamber.

9. The pulsed large and small air aeration device according to claim 1, characterized in that: A plurality of partitions are provided inside the inner shell, and the partitions are fixedly connected to the inner shell. The partitions divide the interior of the inner shell into the aeration chambers.

10. A membrane bioreactor, characterized in that The invention comprises the pulsed large and small air aeration device as described in any one of claims 1 to 9.

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