CN112250170B

CN112250170B - Pulse aerator and membrane group device comprising same

Info

Publication number: CN112250170B
Application number: CN202011413123.XA
Authority: CN
Inventors: 陆雪松; 姚志华
Original assignee: Shanghai Supratec Membrane Science And Technology Co ltd; Shanghai Supratec Environment Protection Co ltd
Current assignee: Shanghai Supratec Membrane Technology Co ltd
Priority date: 2020-12-07
Filing date: 2020-12-07
Publication date: 2021-03-26
Anticipated expiration: 2040-12-07
Also published as: CN112250170A

Abstract

The application discloses a pulse aerator and a membrane module including the same. The pulse aerator comprises an aerator body, an aeration component and an air supply component. The aerator body is provided with an aeration cavity with a downward opening. An aeration assembly is disposed within the aeration chamber. The aeration component comprises a gas collecting hood and a gas outlet cylinder. The opening of the gas-collecting hood is opposite to the top of the aeration cavity and has a preset distance with the top of the aeration cavity. The air outlet cylinder is vertically inserted into the air collecting hood by a preset depth, and the top opening of the air outlet cylinder penetrates through the aerator body. The air supply assembly comprises an air supply pipe arranged below the aeration cavity. The air supply pipe is provided with an air supply hole. The gas in the gas supply pipe is discharged into the aeration cavity through the gas supply hole, the water level in the aeration cavity is gradually reduced to the opening at the bottom of the gas outlet cylinder, and the gas is instantly discharged into the aeration device through the gas outlet cylinder under the double actions of water pressure and air pressure to realize high-strength aeration, so that the sludge on the surface of the membrane module device is scrubbed.

Description

Pulse aerator and membrane group device comprising same

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a pulse aerator and a membrane module comprising the same.

Background

The membrane bioreactor technology is a novel high-efficiency sewage treatment technology combining a high-efficiency membrane separation technology and a traditional activated sludge process. The membrane bioreactor carries out efficient mud-water separation through the hollow fiber membrane, simultaneously can keep microorganisms with longer generation period due to effective interception effect, realizes deep purification of sewage, simultaneously nitrifying bacteria can be fully propagated in a system, the nitrification effect is obvious, and deep dephosphorization and denitrification are possible.

However, in the conventional MBR membrane systems, perforated pipe aeration is mainly adopted, wherein the aeration is performed by utilizing micro-holes distributed on the surface of hollow fiber membrane filaments, and air flow rises in a bubble shape to drive water flow to flow upwards. The membrane filaments are continuously washed by the gas-liquid two-phase flow generated by aeration, so that the sludge adsorbed on the surface of the membrane filaments is removed. In order to ensure the cleanness of the surface of the membrane wire, high-strength airflow and water flow washing is needed, so that the great aeration energy consumption is brought, the frequent aeration causes the overhigh oxygen filling amount of water quality, the water quality is deteriorated, other corresponding eliminating procedures are also needed, and the operating cost of sewage treatment is greatly increased.

Disclosure of Invention

The invention mainly aims to provide a pulse aerator and a membrane module device comprising the same, which realize siphon type exhaust effect through an aeration component and can effectively remove sludge deposited on the surface of the membrane module device.

Another object of the present invention is to provide a pulse aerator, which can provide high-intensity air flow by using the structural design of the pulse aerator, thereby effectively saving energy consumption and greatly reducing operation cost.

Another object of the present invention is to provide a pulse aerator, wherein overflow ports lower than the bottom opening of the air outlet cylinder are disposed on two sides of the aerator body, so that aeration effect of the perforated pipe can be achieved when the air outlet cylinder is blocked.

Another object of the present invention is to provide a pulse aerator, which can effectively enhance the gas collection capacity through the hollow truncated cone-shaped design of the gas collection hood, enhance the backward flow strength of the water flow after exhausting, and improve the aeration capacity.

Another object of the present invention is to provide a pulse aerator, which can effectively increase the volume of discharged air bubbles by the hollow truncated cone shape design of an air outlet cylinder, thereby improving aeration strength.

Another object of the present invention is to provide a pulse aerator, which can make air flow and water flow quickly pass through the gas collecting hood by the eccentric design of the gas outlet cylinder near the gas collecting hood, so as to increase the discharge speed of gas.

Another object of the present invention is to provide a pulse aerator, which can uniformly divide large bubbles by uniformly arranging a plurality of flow dividing ports in the circumferential direction of a flow dividing assembly, so as to uniformly scrub a membrane module.

The invention also aims to provide the pulse aerator which can effectively reduce the influence of scrubbing on the oxygenation effect of water quality while scrubbing the membrane module uniformly, and solve the problem that the aeration in the water treatment process is very easy to cause the water quality to be poor due to the over-oxygenation of the water body.

Another object of the present invention is to provide a pulse aerator, which is provided with a sludge discharge pipe vertically communicated with the lower portion of an air supply pipe, so that under the condition of different air inlet strengths, the rapid switching between aeration and sludge discharge functions can be realized, the work efficiency is greatly improved, and the enterprise cost is saved.

The invention also aims to provide the pulse aerator which has the advantages of compact overall structure, small occupied space, simple structure and low cost, and is suitable for large-scale popularization and use.

To achieve at least one of the above objects of the present invention, the present invention provides an impulse aerator, wherein the impulse aerator comprises:

the aerator body is provided with an aeration cavity with a downward opening;

the aeration component comprises a gas collecting hood and a gas outlet cylinder, wherein the opening of the gas collecting hood is over against the top of the aeration cavity, and a preset distance is reserved between the gas collecting hood and the top of the aeration cavity for collecting gas, the gas outlet cylinder is vertically inserted into the gas collecting hood by a preset depth, and the top opening of the gas outlet cylinder penetrates through the aerator body to realize aeration; and

an air feed subassembly, wherein the air feed subassembly includes the air supply pipe, wherein the air supply pipe set up in the below of aeration chamber, just the intercommunication has been seted up to the air supply pipe the air feed hole of aeration chamber, in order to pass through during the air supply pipe air feed, gaseous by aeration chamber top is pressed down gradually and is irritated the water level of rivers extremely in aeration chamber and the gas collecting hood the bottom opening of air outlet cylinder, gaseous passing through the air outlet cylinder by the top opening of air outlet cylinder discharges, forms the aeration.

Gas in the air feed pipe is discharged into through the air feed hole in the aeration chamber, by the top of aeration chamber gathers gradually and presses down the water level of pouring into the rivers of aeration chamber, treats that the water level reaches the bottom opening part of gas outlet cylinder, receives the dual function of water pressure and atmospheric pressure, will produce instantaneous pulse aeration: air is discharged from the air outlet cylinder instantly, and water flows back to the air collecting hood, so that siphonage occurs, pulse aeration is realized, and large bubbles rising instantly can effectively and thoroughly scrub the membrane group device. In addition, the cover body type design of the gas collecting hood is not influenced by air flow and water flow, when air instantly enters the air outlet cylinder, the original shape of the gas collecting hood is kept unchanged, the backflow entering of the water flow is not influenced, and a good gain effect can be generated on the aeration intensity.

Further, the aerator body is cuboid, circular arc body or S type body to adapt to the environment of placing of aerator body in different membrane group wares, the aeration chamber is formed with a plurality of aeration subcavities along length direction or pitch arc direction interval, aeration subassembly by one-to-one set up in the aeration subcavity, in order to improve pulse aerator' S aeration intensity.

Furthermore, groove-shaped overflow ports are uniformly arranged on the two sides of the lower end of the aerator body along the length direction or the arc direction, and the bottoms of the overflow ports are lower than the bottom opening of the air outlet cylinder, so that aeration is carried out through the overflow ports when the air outlet cylinder is blocked.

Furthermore, the gas-collecting hood is in an inverted hollow round table shape to enhance the aeration strength, and the top of the gas-collecting hood is fixedly connected with the top of the aeration cavity.

Furthermore, the air outlet cylinder is in an inverted hollow round table shape, so that air can be rapidly discharged.

Further, the air outlet cylinder is close to the side wall of the gas collecting hood, so that air and water flow can rapidly pass through the gas collecting hood.

Further, the bottom opening of the air outlet cylinder is close to the bottom of the air collecting hood, so that the aeration strength of the aeration assembly is improved.

Furthermore, the pulse aerator also comprises a shunting assembly matched with the aeration assembly, the shunting assembly comprises a shunting body, the shunting body is provided with a central cavity communicated with the top opening of the air outlet cylinder, and shunting ports communicated with the central cavity are uniformly arranged on the shunting body along the transverse circumferential direction so as to uniformly divide large bubbles to uniformly scrub the membrane assembly.

Further, the air supply pipe intercommunication has the mud pipe of at least one vertical setting, the mud mouth of mud pipe is far less than the height in air feed hole to impurity such as the mud in the discharge air supply pipe prevents that the dirt in air supply pipe and air feed hole from blockking up.

Furthermore, the pulse aerator also comprises two fixing seats, the two fixing seats are respectively arranged at two ends of the aerator body to fix the aerator body, and the air inlet end of the air supply pipe is arranged in any one of the fixing seats to save the arrangement space of the air supply pipe and make the whole structure more compact.

Furthermore, the number of the sludge discharge pipes is one, the sludge discharge pipes are arranged at the tail end of the air supply pipe, and a sludge inlet of each sludge discharge pipe is directly communicated with an opening at the tail end of the air supply pipe;

the mud discharging pipe is fixedly connected with the other fixed seat opposite to the fixed seat where the air inlet end is located. Through the tail end at the air supply pipe set up the sludge discharge pipe to fix this sludge discharge pipe in another fixing base department, impurity such as mud in the drain intake pipe that not only can be good still makes things convenient for the fixed of sludge discharge pipe and air supply pipe, makes pulse aerator integrates more, practices thrift holistic occupation space, makes structural connection relation and structural distribution simpler.

The application also provides a membrane module device, wherein the membrane module device comprises a filter membrane and the pulse aerator, and the filter membrane is positioned above the pulse aerator so as to scrub the filter membrane when the pulse aerator aerates.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description.

Drawings

Fig. 1 is a front view schematically illustrating a pulse aerator according to a preferred embodiment of the present invention.

Fig. 2 is a schematic bottom view of a pulse aerator according to a preferred embodiment of the present invention.

Fig. 3 shows a front cross-sectional view of a pulse aerator according to a preferred embodiment of the present application.

Fig. 4 is a partial bottom view of the aerator body according to a preferred embodiment of the present invention.

Fig. 5 is a partial structural view of a pulse aerator according to a preferred embodiment of the present application.

Detailed Description

The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the disclosure of the specification, the terms "longitudinal", "lateral", "vertical", "upper", "lower", "front", "rear", "left", "right", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships that are based on those shown in the drawings, which are merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and, therefore, the above terms should not be construed as limiting the invention.

Referring to fig. 1 to 5, a pulse aerator according to a preferred embodiment of the present invention includes an aerator body 10, at least one aeration unit 20, and a gas supply unit 30.

The aerator body 10 has an aeration chamber 11 with a downward opening. The aeration assembly 20 is disposed within the aeration chamber 11. It should be noted that the aerator body 10 may be configured as a rectangular parallelepiped, an arc body, an S-shaped body or other non-standard curved body, and may be adaptively designed according to the shape of the membrane module to generate good aeration and scrubbing effects on the membrane module. In addition, as will be understood by those skilled in the art, the aeration chamber 11 may also have a plurality of aeration sub-chambers 111 formed at intervals along the length direction or the arc direction, and the aeration assemblies 20 are disposed in the aeration sub-chambers 111 in a one-to-one correspondence to form uniform aeration, where the number of the aeration sub-chambers 111 is only exemplarily shown as four in this embodiment, and the specific number thereof is not limited, and may be three, or may be five or six.

The aeration assembly 20 includes a gas collection hood 21 and a gas outlet cylinder 22. The gas collecting channel 21 is fixed to the aerator body 10 with an opening facing the top of the aeration chamber 11, and the gas collecting channel 21 has a predetermined distance from the top of the aeration chamber 11 to collect gas through a gap between the gas collecting channel 21 and the top of the aeration chamber 11, as shown in fig. 2 and 3.

The predetermined distance may be set according to actual working requirements, such as aeration intensity and installation space. The air outlet cylinder 22 is vertically inserted into the air collecting hood 21 by a predetermined depth, and the top opening 221 of the air outlet cylinder 22 penetrates through the aerator body 10 to discharge air through the top opening 221 to realize aeration, wherein the top opening 221 of the air outlet cylinder 22 can also be fixedly connected to the top of the aeration chamber 11, and meanwhile, the aerator body 10 is correspondingly provided with an aeration port 12 communicated with the top opening 221, and the aeration effect can also be realized through the top opening 221 and the aeration port 12.

It should be noted that the larger the predetermined distance is, the deeper the predetermined depth is, which means the deeper the gas-collecting hood 21 and the gas-discharging cylinder 22 are in the aeration chamber 11, the stronger the aeration and scrubbing intensity of the aeration assembly 20 is, and the more obvious the sludge stirring effect is.

Preferably, the gas collecting channel 21 is in the shape of an inverted hollow circular truncated cone. Because the size of the upper opening of the inverted hollow truncated cone shape is larger than that of the lower part of the inverted hollow truncated cone shape, when the gas in the gas collecting hood 21 is discharged into the gas outlet cylinder 22 under the water pressure, water flow can rapidly flow back into the gas collecting hood 21 from the upper opening with the larger size, so that the gas which is originally subjected to the water pressure is further improved in airflow strength under the action of the flowing-back water flow, and the aeration strength is enhanced.

Preferably, the air outlet cylinder 22 is in the shape of an inverted hollow circular truncated cone. After the air flow is discharged from the air collecting hood 21 and is delivered to the top opening 221 through the bottom opening 222 of the air outlet cylinder 22, since the opening size of the top opening 221 is larger than that of the bottom opening 222, the volume of the air bubbles is easy to become larger and larger during the delivery through the air outlet cylinder 22, so that larger air bubbles are formed. Because the contact area of the large bubbles and the water body is small in the rising process, the aeration lower than that of the perforated pipe can be effectively ensured, and the oxygen content of the water body is effectively reduced.

It is worth mentioning that the air outlet cylinder 22 is preferably close to the side wall of the gas collecting hood 21, so that, as shown in fig. 3, the air outlet cylinder 22 is close to the right side wall of the gas collecting hood 21 to form an eccentric combined design, so that a large independent space is formed at the left side of the gas collecting hood 21, and the air and the water flow can rapidly pass through the gas collecting hood 21 to form a significant gain effect on the aeration effect of the pulse aerator.

As a preferred embodiment of the present application, the bottom opening 222 of the air outlet cylinder 22 is close to the bottom of the air collecting channel 21. Since the gas can only reach the bottom opening 222 of the gas outlet cylinder 22 and can not be discharged through the gas outlet cylinder 22, so as to form aeration, the lower the position of the bottom opening 222 is, the greater the water pressure and the gas pressure are, and the closer the bottom opening 222 is to the bottom of the gas collecting hood 21, the more the aeration intensity of the aeration assembly 20 can be increased in a limited space.

However, considering that more or less sludge enters the bottom of the gas collecting hood 21 with water flow to form accumulation with the long-term use of the pulse aerator, and in addition, the bottom opening of the gas outlet cylinder 22 may be disposed near the bottom of the gas collecting hood 21 to enhance aeration strength as described above, both reasons may easily cause the sludge to block the bottom opening 222 of the gas outlet cylinder 22 at the bottom of the gas collecting hood 21, so that the whole pulse aerator loses aeration effect. Therefore, the two sides of the lower end of the aerator body 10 along the length direction or the arc direction are also evenly provided with groove-shaped overflow ports 13, and meanwhile, the groove bottoms of the overflow ports 13 are lower than the bottom opening 222 of the air outlet cylinder 22. Therefore, under the normal working condition that the air outlet cylinder 22 is not blocked, the air gradually descends from the top of the aeration cavity 11, firstly reaches the bottom opening 222 of the air outlet cylinder 22, and is discharged by the air outlet cylinder 22; after the air outlet cylinder 22 is blocked by the sludge, the gas cannot be discharged after reaching the bottom opening 222 of the air outlet cylinder 22, and then the gas continuously descends until reaching the overflow port 13 and is discharged from the overflow ports 13 at the two sides of the aerator body 10 to form aeration, so that the effect of perforated pipe aeration is achieved, and the influence of the pulse aerator caused by the blockage of the sludge is greatly reduced.

The gas supply assembly 30 includes a gas supply pipe 31. The air supply pipe 31 is disposed below the aeration chamber 11, and the air supply pipe 31 is opened with an air supply hole 32 communicating with the aeration chamber 11 to supply air to the aeration chamber 11.

As a preferred embodiment of the present application, the pulse aerator further comprises a flow dividing assembly 40 coupled to the aeration assembly 20. The flow diversion assembly 40 includes a flow diversion body 41. The diverter body 41 has a central cavity communicating with the top opening 221. The flow distribution body 41 is uniformly provided with flow distribution ports 42 communicated with the central cavity along the transverse circumferential direction. The large bubbles discharged from the discharge tube 22 are cut into a plurality of small bubbles via the flow dividing body 41. The small bubbles can uniformly scrub the membrane group device in the coverage range and can also stir the water body nearby, so that the stirring effect of the sludge stirring pump is achieved. Because the air bubbles are intermittently sprayed, larger air bubbles formed by each spraying can generate larger impact force, thereby meeting the scrubbing action on the membrane group device and preventing the membrane group device from accumulating mud. In addition, compared with the condition of uneven scrubbing, the uniform scrubbing is provided through the uniformly arranged flow dividing ports 42, the contact area of small bubbles and the water body can be effectively reduced, the oxygenation effect of scrubbing gas on the water body is further reduced, and the good water quality is ensured.

In a preferred embodiment of the present application, the air supply pipe 31 is connected to at least one vertically arranged sludge discharge pipe 50. The sludge discharge port 51 of the sludge discharge pipe 50 is far lower than the height of the air supply hole 32 to discharge impurities such as sludge in the air supply pipe 31, and prevent the air supply pipe 31 and the air supply hole 32 from being blocked by dirt. It can be understood by those skilled in the art that the number of the sludge discharge pipes 50 can be set to one, or two or more, and the sludge discharge pipes 50 are sequentially arranged along the length of the air supply pipe 31 to discharge the sludge in the air supply pipe 31 more quickly and thoroughly.

It is worth mentioning that the person skilled in the art can also easily think that the mud discharging pipe 50 can be connected to the air supply pipe 31 at an included angle larger than 90 °, as long as the mud discharging port 51 is far lower than the air supply hole 32, which can also achieve the mud discharging effect.

It is worth mentioning that when the air supply pipe 31 is supplied with air, the supplied air is firstly discharged into the aeration chamber 11 at the air supply pipe 31 far above the sludge discharge port 51 due to a certain buoyancy of the air, and is finally discharged through the air collecting hood 21 and the air outlet cylinder 22, so as to form aeration. Generally, the air supply hole 32 and the sludge discharge port 51 have a height difference of 160mm to 180 mm. When sludge is required to be discharged, the gas supply strength of the gas supply pipe 31 is increased, and because the gas discharge capacity of the gas supply holes 32 is limited, the incoming gas can flow in the gas supply pipe 31, and most of the incoming gas can be discharged through the sludge discharge pipe 50, at this time, impurities such as sludge in the gas supply pipe 31 can be discharged through the sludge discharge pipe 50, and the sludge discharge effect is realized.

Therefore, the effect of the air supply pipe 31 and the sludge discharge pipe 50 is flexibly and rapidly switched according to the intensity of the supplied air. When the air supply intensity is lower than a certain value, the air supplies air to the aeration cavity 11 only through the air supply hole 32, and finally the aeration of the pulse aerator is realized; when the air supply intensity exceeds the value, air is supplied through the air supply hole 32, and actually most of air is discharged through the sludge discharge pipe 50, so that the sludge discharge effect is realized. Realize the design effect of aeration and row mud integral type through the air feed, arrange mud intensity higher, arrange mud effect better, not only retrench pulse aerator's structure has still practiced thrift the cost of arranging the mud of enterprise greatly.

Preferably, the pulse aerator further comprises two fixing seats 60. The two fixing seats 60 are respectively disposed at two ends of the aerator body 10 to fix the aerator body 10. The air inlet 311 of the air supply pipe 31 is disposed in any one of the fixing seats 60 to save the space for disposing the air supply pipe 31 and make the overall structure more compact, wherein the air inlet of the air supply pipe 31 is disposed in the left fixing seat 60.

As a preferred embodiment of the present application, there is one sludge discharge pipe 50. The sludge discharge pipe 50 is arranged at the tail end of the air supply pipe 31, and the sludge inlet 52 of the sludge discharge pipe 50 is directly communicated with the tail end opening of the air supply pipe 31. The sludge discharge pipe 50 is fixedly connected with a right fixed seat 60. Through the tail end setting of air supply pipe 31 mud pipe 50 to fix this mud pipe 50 in the fixing base 60 department on right side, impurity such as mud in the air supply pipe 31 of not only can be good arranged, it is still convenient mud pipe 50 with air supply pipe 31's fixing makes pulse aeration ware integrates more, practices thrift holistic occupation space, makes structural connection relation and structural distribution simpler.

Specifically, the gas in the gas supply pipe 31 is discharged into the aeration sub-chambers 111 through the gas supply holes 32, and gradually collects from the top of the aeration sub-chambers 111, and lowers the water level of the water flow poured into the aeration chamber 11, and when the water level reaches the bottom opening 222 of the gas outlet cylinder 22, instantaneous pulse aeration is generated under the dual actions of water pressure and gas pressure: air is discharged from the air outlet cylinder 22 into the flow dividing assembly 40 instantly, and meanwhile, water flows back to the air collecting hood 21, so that siphonage occurs to realize pulse aeration. The exhaust of intermittent type formula forms great bubble, and big bubble is via again the reposition of redundant personnel subassembly 40 cuts into a little a plurality of bubbles, follows the circumference of reposition of redundant personnel body 41 reposition of redundant personnel mouth 42 even diffusion not only produces powerful scrubbing effect to the membrane group ware in the coverage, can also stir near rivers, reaches the effect of mud agitator pump. In addition, the air supply strength of the air supply pipe 31 is improved, and due to the limited air exhaust capacity of the air supply holes 32, after the critical value is reached, most of air in the air supply pipe 31 is discharged through the sludge discharge pipe 50, so that the sludge in the air supply pipe 31 is taken away, and the sludge discharge effect is achieved. In addition, the cover body type design of the gas collecting hood 21 is not influenced by air flow and water flow, when air enters the air outlet cylinder 22 instantly, the gas collecting hood 21 keeps the original hollow circular truncated cone shape unchanged, the backward flowing entering of the water flow is not influenced, and a good gain effect can be generated on the aeration intensity: the water flow is fast in backward flowing speed, and the air flow in the air outlet cylinder 22 is further pressurized, so that the aeration intensity of the pulse aerator is improved.

It should be noted that the dual functions of "water pressure" and "air pressure" are described in the specification, wherein "water pressure" refers to the pressure of the surrounding water body to which the gas is subjected at a certain depth in the water body in the aeration chamber, and "air pressure" refers to the pressure caused by the continuous supply of the gas provided by the gas supply pipe.

The application also provides a membrane module, wherein the membrane module comprises a filter membrane and the pulse aerator, wherein the filter membrane is positioned above the pulse aerator so as to scrub the filter membrane when the pulse aerator aerates. The energy consumption of the membrane group device comprising the pulse aerator is reduced by more than 50% compared with the traditional perforated pipe aeration.

It will be appreciated by persons skilled in the art that the embodiments of the invention shown in the foregoing description are by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims

1. A pulse aerator, wherein said pulse aerator comprises:

the aerator body is provided with an aeration cavity with a downward opening;

the air supply assembly comprises an air supply pipe, wherein the air supply pipe is arranged below the aeration cavity, the air supply pipe is provided with an air supply hole communicated with the aeration cavity, when air is supplied through the air supply pipe, air is gradually pressed from the top of the aeration cavity to fill the water level of water flow in the aeration cavity and the air collecting cover to the bottom opening of the air outlet cylinder, and the air is discharged from the top opening of the air outlet cylinder through the air outlet cylinder to form aeration;

the two sides of the lower end of the aerator body along the length direction or the arc direction are uniformly provided with groove-shaped overflow ports, and the bottoms of the overflow ports are lower than the bottom opening of the air outlet cylinder;

the air supply pipe is communicated with at least one vertically arranged sludge discharge pipe, a sludge discharge opening of the sludge discharge pipe is far lower than the air supply hole, and a height difference of 160mm-180mm is formed between the air supply hole and the sludge discharge opening;

the mud pipe is one, the mud pipe is set up in the tail end of air supply pipe, just the mud inlet of mud pipe directly communicates the tail end opening of air supply pipe.

2. The pulse aerator according to claim 1, wherein the aerator body is a rectangular parallelepiped, an arc-shaped body or an S-shaped body, the aeration chamber is formed with a plurality of aeration sub-chambers at intervals along the length direction or the arc direction, and the aeration assemblies are arranged in the aeration sub-chambers in a one-to-one correspondence.

3. The pulse aerator of claim 1, wherein said gas-collecting hood is in the shape of an inverted hollow truncated cone, and the top of said gas-collecting hood is fixedly connected to the top of said aeration chamber.

4. The pulse aerator of claim 1, wherein said outlet cylinder is in the form of an inverted hollow cone.

5. The pulse aerator of claim 4, wherein said air outlet cylinder is located adjacent to a side wall of said gas collection enclosure.

6. The pulse aerator of claim 1 or 5, wherein the bottom opening of said gas outlet cylinder is proximate to the bottom of said gas collection enclosure.

7. The pulse aerator of claim 1, further comprising a flow distribution assembly coupled to the aeration assembly, wherein the flow distribution assembly comprises a flow distribution body having a central cavity communicating with the top opening of the gas outlet cylinder, the flow distribution body is uniformly provided with flow distribution ports communicating with the central cavity along the transverse circumferential direction, and the instantaneously released large pulse bubbles are divided into uniform small bubbles through the flow distribution ports so as to uniformly scrub the membrane assembly above.

8. The pulse aerator of claim 1, further comprising two fixing seats, wherein the two fixing seats are respectively disposed at both ends of the aerator body to fix the aerator body, and the air inlet end of the air supply pipe is disposed in any one of the fixing seats.

9. The pulse aerator of claim 8, wherein said sludge discharge pipe is fixedly connected to another fixed seat opposite to the fixed seat where said air inlet end is located.

10. A membrane module comprising a filtration membrane and a pulse aerator as claimed in any one of claims 1 to 9, the filtration membrane being positioned above the pulse aerator to scour the filtration membrane as the pulse aerator aerates.