CN218924324U - Aeration device, membrane assembly and sewage treatment system - Google Patents

Abstract

The utility model discloses a membrane module, an aeration device, a cleaning method and a sewage treatment system, which relate to the technical field of sewage treatment and comprise the following steps: the gas distribution device comprises a gas storage box, an inner box, a hollow pipe and a gas distribution unit, wherein the inner box and the hollow pipe are both positioned in the gas storage box, the hollow pipe is positioned in the inner box, the gas distribution unit is positioned outside one end of the gas storage box, the other end of the gas storage box is provided with a gas inlet, the gas storage box is communicated with one end of the inner box, and the other end of the inner box is closed; one end of the hollow pipe is communicated with the inside of the other end of the inner box, and the other end of the hollow pipe is communicated with the air distribution unit; the air distribution unit is provided with an air distribution port, the included angle between the opening direction of the air distribution port and the axis of the hollow pipe is (0, 90 degrees), and the cleaning effect of the air distribution unit is good for the technical problem of poor cleaning effect of the hollow membrane wires.

Description

Aeration device, membrane assembly and sewage treatment system

Technical Field

The utility model relates to the technical field of sewage treatment, in particular to an aeration device, a membrane assembly and a sewage treatment system.

Background

Ultrafiltration membranes have been widely used in various fields, such as water treatment, food, energy, electronics, medicine, chemical industry, etc., because of their energy saving, high efficiency, cleanliness, etc. However, the lifetime of the membranes and membrane fouling severely limit their use, especially in the water treatment field.

Patent publication CN204365148U provides an ultrafiltration membrane module, a hollow tube (fiber membrane wires are distributed around the hollow tube) is arranged at the center of a column type shell of the module, the top end of the hollow tube is a concentrated water outlet, the bottom end is an inlet, water permeable holes are formed in the surface of the hollow tube, the upper end of the hollow fiber membrane wires is fixed, the bottom end is a hanging free end, and water flows through the water permeable holes to impact the membrane wires during filtration, so that the membrane wires shake, and self-cleaning is realized. The ultrafiltration membrane component has the defects that membrane wire shaking amount caused by the impact action of water flow or gas passing through a water permeable hole is limited, the cleaning effect is poor, the membrane wire flux is ensured by adopting a higher-frequency medicament for cleaning, the cleaning effect on pollutants at the upper end of the membrane wire is poor by adopting the cleaning mode, the reduction of the filling amount of the membrane with the same area is also meant while the central tube is arranged, and the water purifying effect is reduced.

Disclosure of Invention

1. Technical problem to be solved by the utility model

Aiming at the technical problem of poor cleaning effect of a membrane assembly, the utility model provides an aeration device, the membrane assembly, a cleaning method and a sewage treatment system, and the cleaning effect of the aeration device is good.

2. Technical proposal

In order to solve the problems, the technical scheme provided by the utility model is as follows:

An aeration device of a membrane module, comprising: the gas distribution device comprises a gas storage box, an inner box, a hollow pipe and a gas distribution unit, wherein the inner box and the hollow pipe are both positioned in the gas storage box, the hollow pipe is positioned in the inner box, the gas distribution unit is positioned outside one end of the gas storage box, the other end of the gas storage box is provided with a gas inlet, the gas storage box is communicated with one end of the inner box, and the other end of the inner box is closed; one end of the hollow pipe is communicated with the inside of the other end of the inner box, and the other end of the hollow pipe is communicated with the air distribution unit; the aeration device is characterized in that the air distribution unit is provided with an air distribution port, the opening direction of the air distribution port and the axis of the hollow tube form an included angle of (0, 90 degrees), a large amount of air bubbles can be generated by the structure of the aeration device, the air distribution port is arranged towards the air distribution port, so that the air bubbles generated by the aeration device can not directly impact hollow membrane wires, the order of the hollow membrane wires can not be destroyed, the cleaning is thorough, the cleaning effect is good, when the aeration device is arranged in a membrane assembly, a large amount of air bubbles can be generated, the membrane wire shaking is promoted, and the aeration device can not reduce the membrane filling quantity relative to the central tube aeration.

Further, the opening direction of the air distribution opening is tangential to an external circle of the hollow tube, and the air distribution opening is arranged tangentially. As the preferable air distribution port setting scheme, the air bubble discharging direction completely avoids the impact on the hollow membrane wires, and the air bubble generating amount in the same time is increased by the air bubble setting scheme, so that the cleaning period is definitely short, the cleaning is clean, and the cleaning is convenient and quick.

Further, the gas distribution unit comprises a main channel and a gas distribution channel, wherein the main channel is communicated with the hollow pipe, one end of the gas distribution channel is communicated with the main channel, and a gas distribution port is arranged at the other end of the gas distribution channel. The number of the air distribution openings on the air distribution channel can be multiple, so that the air bubble generation amount is increased, and the cleaning efficiency is improved.

Further, the air storage box also comprises a water distribution channel, and the water distribution channel is attached to the edge of the air storage box. The sewage treatment device is convenient for raw water to pass through, is distributed in the shell, is filtered by the membrane component, and is used for discharging sewage after the shell is periodically cleaned.

Further, the air distribution channel is curved. The curve can effectively offset the acting force carried by the bubbles, so that the damage to the hollow membrane wire caused by overlarge bubble impact force can be prevented.

Further, the gas distribution unit is provided with N groups of gas distribution ports with different opening directions, the gas inlet of the gas storage box, the inner box and the hollow pipe are all divided into N independent parts, the respective independent parts of the gas inlet of the divided gas storage box, the inner box and the hollow pipe are correspondingly communicated in sequence to form N independent gas paths, the N independent gas paths are respectively communicated with the N groups of gas distribution ports with different opening directions on the gas distribution unit, and N is more than or equal to 2 and is an integer. Because a plurality of independent gas circuits communicate with a plurality of groups of gas distribution openings with different opening directions respectively, the directions of bubble outlets discharged from the gas distribution openings with different opening directions are different, the membrane assembly can be washed in a plurality of directions, and part of pollutants can still be adsorbed on the surfaces of the hollow membrane wires due to the washing in a single direction.

Further, the gas storage cavity of the gas storage box comprises a first gas storage cavity and a second gas storage cavity; the other end of the first gas storage cavity is provided with a first gas inlet, and the other end of the second gas storage cavity is provided with a second gas inlet; the inner box comprises an inner box cavity I and an inner box cavity II, and one end of the inner box cavity I is communicated with one end of the gas storage cavity I; one end of the inner box cavity II is communicated with one end of the gas storage cavity II; the bottom of the other end of the first inner box cavity and the bottom of the other end of the second inner box cavity are both closed and are both arranged outside the hollow pipe; the hollow pipe comprises a hollow pipe I and a hollow pipe II, and one end of the hollow pipe I is communicated with the other end of the inner box cavity I; one end of the hollow pipe II is communicated with the other end of the inner box cavity II; the air distribution unit comprises an air distribution cavity I and an air distribution cavity II; the other end of the hollow tube I is communicated with a gas distribution cavity I, and a gas distribution opening I is arranged on the gas distribution cavity I; the other end of the second hollow tube is communicated with a second air distribution cavity, and a second air distribution opening is formed in the second air distribution cavity; the openings of the first air distribution opening and the second air distribution opening are oriented differently.

Further, the gas distribution unit further comprises a first gas distribution channel and a second gas distribution channel; one end of the first air distribution channel is communicated with the first air distribution cavity, and the other end of the first air distribution channel is provided with a first air distribution opening; one end of the second air distribution channel is communicated with the second air distribution cavity, and the other end of the second air distribution channel is provided with a second air distribution opening.

Further, the opening of the first air distribution opening faces opposite to the opening of the second air distribution opening.

Further, the opening direction of the air distribution opening is tangential to the circumscribing circle of the hollow tube I, and the air distribution opening I and the air distribution opening II are tangentially arranged.

Further, the first air distribution channel and the second air distribution channel are both curved.

Further, the hollow tube II is positioned outside the hollow tube I, and part of the tube wall at one end of the hollow tube I is fixedly connected with the other end of the inner box cavity II.

Further, one end of the first air distribution cavity is partially closed and is adjacent to one end of the second air distribution cavity, the other part of the first air distribution cavity is communicated with the other end of the first hollow pipe, the other end of the first air distribution cavity is closed, and a first air distribution opening is formed in one side face of the first air distribution cavity; the other end of the air distribution cavity II is communicated with the other end of the hollow pipe II; and a second air distribution opening is arranged on the second side surface of the air distribution cavity. Through the scheme, a two-way cleaning mode is realized, and the hollow membrane filaments can be thoroughly, conveniently and rapidly cleaned.

A membrane module comprising an aeration device according to any one of the preceding claims, further comprising: the hollow membrane wires are positioned in the shell, gaps are reserved between adjacent hollow membrane wires, one end of each hollow membrane wire is arranged in one end of the shell, and the other end of each hollow membrane wire is free and blocked; one end of the shell is provided with a water concentration port and a water production port; the other end of the shell is provided with an aeration device and a water inlet channel.

Further, a sealing layer is arranged inside one end of the shell, and one end of the hollow membrane wire is fixed in the sealing layer.

Further, the water concentration port is arranged on the side surface of the shell between one end and the other end of the hollow membrane wire, or a water concentration channel is arranged in one end of the shell, and the water concentration channel is communicated with the water concentration port at one end of the shell.

A sewage treatment system comprising a membrane module according to any one of the above, and further comprising a sewage pipe, a water producing pipe, a concentrate pipe and an air inlet pipe; the sewage pipe is communicated with the water inlet channel, the water producing pipe is communicated with the water producing port, the concentrated water pipe is communicated with the concentrated water port, the sewage pipe is provided with a sewage pump, and the air inlet pipe is communicated with the air inlet channel.

A method of cleaning a membrane module comprising: when the set filtering time T1 is reached, back flushing is carried out, wherein the time is T2; closing the water producing port, introducing gas into the gas inlet, discharging bubbles generated by the aeration device from the gas distribution port, cleaning the hollow membrane wire for T3 time, closing the concentrated water port, and opening the water inlet channel to discharge sewage.

Further, the method comprises the steps of: introducing gas into the first air inlet, discharging bubbles generated by the aeration device from the first air distribution opening, cleaning the hollow membrane filaments for T31, and closing the first air inlet; after T32, introducing gas into the second air inlet, discharging bubbles generated by the aeration device from the second air distribution opening, cleaning the hollow membrane filaments for T33, and closing the second air inlet; closing the water concentration port, and opening the water inlet channel to discharge sewage; repeating the above process until the cleaning time reaches the end of T3; wherein t3=xt31+2yt32+zt33, and x, y, z are positive integers.

Further, the back flushing method comprises the following steps: closing the water inlet channel, opening the water concentration port, introducing gas into the water production port for a time of T2, allowing the gas to enter the inner hole of the hollow membrane wire 21, and extruding residual water in the hollow membrane wire; or closing the water concentration port and the air inlet channel, opening the water production port and the water inlet channel, enabling the membrane produced water to enter the inner hole of the hollow membrane wire from the water production port, enabling the membrane produced water to pass through the membrane hole under the action of pressure to reach the outer side of the hollow membrane wire, loosening and falling off the pollutants attached to the hollow membrane wire, and discharging the cleaned sewage from the water inlet channel.

Further, S1, introducing gas into the gas inlet of the ith independent part, discharging bubbles generated by the aeration device from the gas distribution opening in the ith direction, and cleaning the hollow membrane filaments for T4i time; stopping introducing gas into the gas inlet of the i independent part, repeating the steps S1 to j for N times after T42 time, wherein N is more than or equal to 2, i, j and N are integers, and i is less than or equal to N; wherein, the liquid crystal display device comprises a liquid crystal display device,

3. advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

the structure of the aeration device can generate a large amount of bubbles, and the direction of the air distribution opening is arranged, so that the bubbles generated by the aeration device can not directly impact the hollow membrane wires, the order of the hollow membrane wires can not be destroyed, the cleaning is thorough, and the cleaning effect is good. The membrane wire component, the sewage treatment system and the cleaning method are matched, so that the filtering effect is good, the cleaning is convenient and quick, and the cleaning is clean.

Drawings

Fig. 1 is a schematic perspective view of an aeration device according to a first embodiment of a membrane module according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram showing a second perspective structure of an aeration device according to an embodiment of the present utility model.

Fig. 3 is a schematic cross-sectional view of an embodiment of an aeration device for a membrane module according to an embodiment of the present utility model.

Fig. 4 is a schematic diagram of a gas distribution unit of an embodiment of an aeration device of a membrane module according to an embodiment of the present utility model.

Fig. 5 is a schematic perspective view of a second embodiment of an aeration device for a membrane module according to an embodiment of the present utility model.

Fig. 6 is a schematic diagram showing a second perspective structure of an aeration device of a membrane module according to a second embodiment of the present utility model.

Fig. 7 is a schematic cross-sectional view of a second embodiment of an aeration device for a membrane module according to an embodiment of the present utility model.

Fig. 8 is a cross-sectional view of the inner box and the hollow tube of the second embodiment of the aeration device for a membrane module according to the embodiment of the present utility model.

Fig. 9 is a schematic diagram of a gas distribution unit of a second embodiment of an aeration device for a membrane module according to an embodiment of the present utility model.

Fig. 10 is a schematic diagram of a second air distribution unit of the second embodiment of the aeration device for a membrane module according to the embodiment of the present utility model.

Fig. 11 is a partial structural cross-sectional view of fig. 10.

Fig. 12 is a schematic cross-sectional view of a membrane module according to an embodiment of the present utility model including an aeration device.

Fig. 13 is a schematic view showing an outer surface of one of the air distribution unit embodiments of the aeration device of the membrane module according to the embodiment of the present utility model.

Fig. 14 is a schematic view of an inner surface of one of the air distribution units of the aeration device of the membrane module according to the embodiment of the present utility model.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.

The present application is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the utility model are shown in the drawings. The first, second, etc. words are provided for convenience in describing the technical scheme of the present utility model, and have no specific limitation, and are all generic terms, and do not constitute limitation to the technical scheme of the present utility model. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. 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. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art. The technical schemes in the same embodiment and the technical schemes in different embodiments can be arranged and combined to form a new technical scheme without contradiction or conflict, which is within the scope of the utility model.

Example 1

In connection with fig. 1-14, this embodiment provides an aeration device for a membrane module, comprising: the gas storage box 11, the inner box 12, the hollow pipe 13 and the gas distribution unit 14, wherein the inner box 12 and the hollow pipe 13 are both positioned in the gas storage box 11, the hollow pipe 13 is positioned in the inner box 12, the gas distribution unit 14 is positioned at the outer side of one end of the gas storage box 11, the other end of the gas storage box 11 is provided with a gas inlet 15, one end of the gas storage box 11 is communicated with one end of the inner box 12, the other end of the inner box 12 is closed,

one end of the hollow tube 13 is internally connected with the other end of the inner box 12, and the other end of the hollow tube 13 is communicated with the air distribution unit 14; the air distribution unit 14 is provided with an air distribution opening 16, and the included angle between the opening direction of the air distribution opening 16 and the axis of the hollow tube 13 is (0, 90 ° ], as shown in fig. 1 and 3.

Wherein the air storage box 11 and the hollow tube 13 may be integrally formed or fixedly connected as shown in fig. 1. The inner box 12 can be connected to the hollow pipe 13 or the gas storage box 11, and is selected by comprehensively considering factors such as production and manufacturing cost, convenience and the like according to practical application.

The gas storage box 11, the inner box 12 and the hollow pipe 13 are sleeved in sequence, and preferably, the central axes of the gas storage box 11, the inner box 12 and the hollow pipe 13 are coincident, so that annular gaps between the inner box 12 and the gas storage box 11 are uniformly distributed, and annular gaps between the inner box 12 and the hollow pipe 13 are uniformly distributed. Through the structure of the three sleeved in turn, gas enters the gas storage box 11, the inner box 12, the hollow pipe 13 and the gas distribution unit 14 from the gas inlet 15 in turn, and comes out from the gas distribution opening 16 on the gas distribution unit 14 to form bubbles, so that aeration flushing and cleaning are carried out on the membrane component. After the gas with a certain pressure passes through the path, the impact force of the gas is buffered, the impact force of bubbles discharged from the gas distribution port 16 is reduced, the die assembly formed by combining the hollow membrane wires 21 can be washed and cleaned, and the structure of the hollow membrane wires 21 is not damaged due to overlarge impact force.

Because the membrane module is positioned at the upper part of the aeration device, namely at the top of the air distribution unit 14, the hollow membrane wires are generally vertically arranged in the membrane module and keep parallel with the axis of the hollow tube 13 in a natural state. The included angle between the air distribution opening 16 and the axis of the hollow tube 13 is limited to (0, 90 ° ], namely, the included angle between the air distribution opening 16 and the axis of the hollow tube 13 is limited to the included angle, so that the situation that the hollow membrane wires are mutually crossed and overlapped due to floating bending after being impacted by the air distribution opening 16 directly, the hollow membrane wires are ordered disorderly, the situation that the original vertical state cannot be restored after the cleaning is finished, and the situation that the hollow membrane wires are bent and broken even the impact force is overlarge occurs can be avoided, namely, the included angle between the opening direction of the air distribution opening 16 and the axis of the hollow tube 13 is 90 degrees, 85 degrees, 80 degrees and other values are adopted in the air distribution opening 14.

In the specific design of the aeration device of the membrane assembly of this embodiment, factors such as the number of hollow membrane wires in the membrane assembly, the size of the volume of the membrane assembly, the size of the cross section of the membrane assembly, the distance between the gas distribution unit 14 and the membrane assembly, the pressure range of the gas introduced from the gas inlet 15 of the gas storage box 11, are taken into consideration comprehensively, so as to determine the size of the designed aeration device, the size and the volume of the gas storage box 11, the inner box 12, the hollow tube 13 and the gas distribution unit 14 in the aeration device, and the space between them are set, the number of the gas distribution openings 16, the size of the gas distribution openings 16 and the direction of the gas distribution openings 16 are optimally designed, so as to achieve the optimal cleaning effect.

The opening direction of the air distribution opening 16 is tangential to an circumscribed circle of the hollow tube 13, and the air distribution opening 16 is tangentially arranged. The included angle between the opening direction of the air distribution opening 16 and the axis of the hollow tube 13 is 90 degrees, the plane where the opening directions of all the air distribution openings 16 distributed on the air distribution unit 14 are vertical to the axis of the hollow tube 13 and tangential to an external circle of the hollow tube 13, under the condition of adopting the design scheme, the opening direction of the air distribution opening 16 is vertical to the hollow membrane wires in a natural state, and when the membrane assembly is cleaned by the aeration device, bubbles at the outlet of the air distribution opening 16 can not directly impact the hollow membrane wires, so that the hollow membrane wires are prevented from floating upwards, the hollow membrane wires are driven to rotate, and the cleaning effect is improved. The hollow membrane yarn can be fully protected, the plurality of air distribution openings 16 are tangentially arranged, so that bubbles discharged by the aeration device are discharged into the membrane assembly along the tangential direction to wash the hollow membrane yarn, the impact force of the bubbles is further reduced, the bubbles rotate along the tangential direction, the bubbles rise to the top from the bottom of the hollow membrane yarn, and the impurities on the surface of the hollow membrane yarn have better cleaning and washing effects.

The air distribution unit 14 comprises a main channel 17 and an air distribution channel 18, wherein the main channel 17 is communicated with the hollow pipe 13, one end of the air distribution channel 18 is communicated with the main channel 17, and the other end of the air distribution channel 18 is provided with an air distribution port 16. The gas from the hollow pipe 13 enters the gas distribution unit 14 through the main channel 17 in the gas distribution unit 14, then enters the gas distribution channel 18, and the gas is discharged from the gas distribution port 16 on the other end of the gas distribution channel 18, the gas distribution channel 18 plays the role of distributing the gas distribution port 16 on the gas distribution unit 14, and when the gas distribution unit 14 is required to be provided with a plurality of gas distribution ports 16, the number of the corresponding gas distribution channels 18 is kept consistent; in addition, the gas flowing into the main channel 17 is split and distributed, so that the impact force of the gas is further weakened, and the gas distribution channel 18 can be linear, irregular, or curved for further optimizing the effect.

The air storage box also comprises a water distribution channel 19, and the water distribution channel 19 is attached to the edge of the air storage box 11. When the membrane module filters water to be treated or raw water, the water to be treated or raw water is introduced into the membrane module through the water distribution channel 19. After the periodic cleaning of the membrane assembly is completed, the water distribution channel 19 is used for discharging sewage in the membrane assembly after the hollow membrane wires are cleaned.

The other end of the inner box 12 is provided with an access hole 121, and the access hole 121 is provided with an openable access cover 122. If the aeration device is blocked, such as the air distribution channel 18, the air distribution port 16 and the hollow pipe 13 are blocked, the access cover 122 can be detached to clean and be discharged from the access hole 121, so that the normal use of the aeration device is not affected.

The air distribution channel 18 is curved. For further cushioning the pressure carried by the gas and avoiding excessive impact of the bubbles discharged from the gas distribution port 16.

One end of the hollow tube 13 is provided with an air hole communicated with the inside of the other end of the inner box 12. The air holes are used for forming a siphon effect, the air which is continuously introduced into the air storage box 11 enters the inner box 12, gathers in the inner box 12 at the other end, the stored air is instantaneously discharged into the air distribution unit 14 from the hollow pipe 13 through the air holes at the other end of the hollow pipe 13, and is distributed through the main channel 17 and the air distribution channel 18 of the air distribution unit 14, and then air bubbles are discharged through the air distribution port 16 to wash and clean the hollow membrane wires.

Further air distribution openings 16 or air distribution channels 18 are provided with air holes, the size of the air holes, the distance between the air holes, the pressure carried by the air, the volume of the aeration device and other factors jointly determine the size of generated bubbles and the impact force of the bubbles, the flushing effect is determined, and the cleaning effect can be further improved by optimally designing the air holes.

In this embodiment, an embodiment of a gas distribution unit 14 is further provided, where the gas distribution unit 14 is provided with N groups of gas distribution ports 16 with different opening directions, the gas inlet 15 of the gas storage box 11, the inner box 12 and the hollow tube 13 are all divided into N independent parts, and correspondingly, the independent parts of the gas inlet 15 of the divided gas storage box 11, the inner box 12 and the hollow tube 13 are sequentially communicated to form two independent gas paths, and are respectively communicated with N groups of gas distribution ports 16 with different opening directions on the gas distribution unit 14, where N is greater than or equal to 2 and N is an integer. As shown in fig. 5-11, N groups of air distribution openings 16 with different opening directions can be arranged on the air distribution unit 14, that is, the opening directions of each group are different, the number of the air distribution openings 16 in each group is multiple, when air is introduced into different air paths, the directions of air bubbles are different due to the different opening directions of the air distribution openings 16, so that the air bubble scouring cleaning effect with different directions is formed. The method comprises the following steps: after the membrane component filters raw water, two groups of independent air channels respectively and alternately work in a time-sharing mode to flush the hollow membrane wires in the membrane component when a cleaning period starts, and when different independent air channels work, the air bubbles discharged by the air distribution openings flush the hollow membrane wires due to the limitation of the arrangement direction of the air distribution openings due to the different opening directions of the air distribution openings 16, so that the rotation directions of the hollow membrane wires are different, and impurities attached to the surfaces of the hollow membrane wires are prevented from being difficultly flushed due to the influence of the shearing force; through the washing of the parting period, through the scouring effect of N different directions, can clean up the impurity attached on the surface of the hollow membrane silk, it is expected that the value of N is various in theory, but considering the design cost in practice, the construction complexity of the aeration device, the space of the aeration device and the problem that whether it is easy to be blocked or not, etc., the value of N can be limited to a certain extent, and N is preferably selected to be 2 or 3.

As shown in fig. 5, the gas storage cavity of the gas storage box 11 comprises a first gas storage cavity 111 and a second gas storage cavity 112, as shown in fig. 5, a first isolation piece 113 is arranged in the gas storage box 11 to divide the first gas storage cavity of the gas storage box 11 into two parts, and one end of each of the first gas storage cavity 111 and the second gas storage cavity 112 is communicated with the inner box 12; the other end of the first air storage cavity 111 is provided with a first air inlet 151, and the other end of the second air storage cavity 112 is provided with a second air inlet 152. In the arrangement scheme, the air inlet 15 is divided into two parts to form two independent gas paths which are not interfered with each other; the gas storage chamber in the gas storage box 11 is also divided into two independent chambers: a first gas storage cavity 111 and a second gas storage cavity 112; is used for designing an independent air passage. In fig. 6, the air distribution unit 14 further includes a base 141 and a top cover 142, the base 141 is disposed on top of the air storage box 11, and the top cover 142 is used for blocking the main channel 17 or blocking the air distribution cavity two 172, as shown in fig. 9, 10 and 11.

As shown in fig. 7 and 8, the second partition 123 divides the first inner case 12 into two parts, including a first inner case chamber 121 and a second inner case chamber 122, and one end of the first inner case chamber 121 communicates with one end of the first gas storage chamber 111; one end of the second inner box cavity 122 is communicated with one end of the second gas storage cavity 112; the bottom of the other end of the first inner box cavity 121 and the bottom of the other end of the second inner box cavity 122 are both closed and are both arranged outside the hollow tube 13. The inner case 12 is divided into two: the first inner box cavity 121 is communicated with the first air storage cavity 111, and the second inner box cavity 122 is communicated with the second air storage cavity 112 and is used for designing two independent air paths. The second partition 123 is disposed at the bottom of the second end cover 134, and the top of the second end cover 134 is connected with one end of the gas storage box 11, so as to fix the second partition 123, so that the first inner box cavity 121 and the second inner box cavity 122 form independent and non-communicating chambers.

As shown in fig. 7 and 8, the hollow tube 13 includes a hollow tube one 131 and a hollow tube two 132, one end of the hollow tube one 131 is communicated with the other end of the inner box chamber one 121; one end of the hollow pipe II 132 is communicated with the other end of the inner box cavity II 122; the other end of the first hollow pipe 131 and the other end of the second hollow pipe 132 are communicated with the air distribution unit 14 and are designed into two independent air paths. The part of the second hollow tube 132 passing through the second end cover 134 is a second hollow tube extension part, and the second hollow tube extension part is communicated with the second air distribution cavity 172 to form a complete air path and form an isolation effect which is not communicated with the first hollow tube 131.

As shown in fig. 7, 9, 10 and 11, the air distribution unit 14 includes an air distribution chamber one 171 and an air distribution chamber two 172, i.e., formed by the main passage 17 being divided into two parts; the other end of the first hollow tube 131 is communicated with a first air distribution cavity 171, and the first air distribution cavity 171 is provided with a first air distribution opening 161; the other end of the second hollow tube 132 is communicated with a second air distribution cavity 172, and a second air distribution opening 162 is arranged on the second air distribution cavity 172; the openings of the first air distribution port 161 and the second air distribution port 162 are oriented differently, so that two air paths with completely different air bubble discharge directions are formed, and intermittent flushing of the hollow membrane wires in different directions is realized by matching with ventilation control.

As shown in fig. 6, 9, 10 and 11, the gas distribution unit 14 further includes a first gas distribution channel 181 and a second gas distribution channel 18, i.e., formed by the gas distribution channel 18 being divided into two parts; one end of the first air distribution channel 181 is communicated with the first air distribution cavity 171, and the other end of the first air distribution channel 181 is provided with a first air distribution opening 161; one end of the second air distribution channel 182 is communicated with the second air distribution cavity 172, and the other end of the second air distribution channel 182 is provided with a second air distribution opening 162.

The opening of the first cloth port 161 is opposite to the opening of the second cloth port 162. In the cleaning period, in different time periods, the directions of the bubbles discharged from the first air distribution port 161 and the second air distribution port 162 are opposite, the hollow membrane wires are subjected to the scouring action of the bubbles and can also rotate towards the two opposite directions, so that the full and thorough cleaning action of the hollow membrane wires 21 is realized.

As shown in fig. 1, 4 and 9, the opening direction of the air distribution opening 16 is tangential to the circumscribing circle of the hollow tube one 131, and the air distribution opening one 161 and the air distribution opening two 162 are arranged tangentially. The first gas distribution channel 181 and the second gas distribution channel 182 are both curved. The second hollow tube 132 is located outside the first hollow tube 131, and a part of the tube wall at one end of the first hollow tube 131 is fixedly connected with the other end of the second inner box cavity 122.

As shown in fig. 7, 10 and 11, one end of the first air distribution cavity 171 is partially closed and is adjacent to one end of the second air distribution cavity 172, the other end of the first air distribution cavity 171 is communicated with the other end of the first hollow pipe 131, the other end of the first air distribution cavity 171 is closed, and an air distribution port 161 is arranged on the side surface of the first air distribution cavity 171; the other end of the second air distribution cavity 172 is communicated with the other end of the second hollow tube 132; and a second air distribution opening 162 is arranged on the side surface of the second air distribution cavity 172.

In addition, as shown in fig. 10 and 11, a first gas distribution channel 181 is arranged on the side surface of the first gas distribution cavity 171, one end of the first gas distribution channel 181 is communicated with the first gas distribution cavity 171, and a first gas distribution port 161 is arranged at the other end of the first gas distribution channel 181; the side surface of the second air distribution cavity 172 is provided with a second air distribution channel 182, one end of the second air distribution channel 182 is communicated with the second air distribution cavity 172, and the other end of the second air distribution channel 182 is provided with a second air distribution opening 162.

As shown in fig. 13 and 14, the main channel 17 is equally divided into four parts by the partition plate, and is respectively communicated with one ends of the four gas distribution channels 18, the other ends of the gas distribution channels 18 are all provided with gas distribution openings 16, and similarly, the main channel 17 can be equally divided into five, six and seven parts by the partition plate, which is beneficial to the uniformity of gas distribution in each gas distribution channel 18, and the more the gas distribution channels 18, the more the number of the gas distribution openings 16, and when the gas distribution channels are flushed, bubbles are simultaneously discharged from the gas distribution openings 16, so that the gas distribution channels can be quickly fully distributed in the shell, and the gas distribution is uniform.

Example 2

This embodiment provides a membrane module, including an aeration device according to any one of the embodiments 1, as shown in fig. 12 and 13, further including: the hollow membrane wires 21, the shell 22, the first end cover 23 and the second end cover 24, wherein a plurality of the hollow membrane wires 21 are positioned in the shell 22, gaps are reserved between adjacent hollow membrane wires 21, one end of each hollow membrane wire 21 is arranged in one end of the shell 22, and the other end of each hollow membrane wire 21 is free and blocked; one end of the shell 22 is provided with a water concentration port 25 and a water production port 29; the other end of the housing 22 is provided with an aeration device and a water inlet passage 26. The water producing port 29 discharges the filtered purified water, the water concentrating port 25 discharges the filtered waste water containing impurities and the like, and the water inlet channel 26 is used for introducing water to be treated, namely raw water; in the periodic cleaning process, the aeration device generates bubbles for cleaning contaminants, such as contaminants, adhering to the surfaces of the hollow membrane filaments 21 in the membrane module. One end of each hollow membrane wire 21 is arranged inside one end of the shell 22, the other end of each hollow membrane wire 21 is free and blocked, namely, one end of each hollow membrane wire 21 is fixed, the other end of each hollow membrane wire 21 is not fixed, the hollow membrane wires are free, end faces are blocked, and the hollow membrane wires 21 sag under the action of gravity and are positioned inside the shell 22.

The water concentration port 25 is arranged on the side surface of the shell 22 between one end and the other end of the hollow membrane wire 21, or a water concentration channel is arranged in one end of the shell 22 and is communicated with the water concentration port 25 at one end of the shell 22. The water concentration port 25 is used for periodically discharging the pollutants in the raw water filtered by the hollow membrane wires 21, and has flexible setting positions, but obviously needs to be communicated with the inside of the shell 22 where the free ends of the hollow membrane wires 21 are located. When the water concentration port 25 is disposed at one end of the housing 22, the water concentration port 25 needs to be communicated with the interior of the housing 22 where the free ends of the hollow membrane wires 21 are disposed, so that an additional water concentration channel is required to be disposed at one end of the housing 22, and thus the water concentration channel occupies the arrangement area of the hollow membrane wires 21 in the housing 22. If the sealing layer 221 is disposed inside one end of the housing 22, one end of the hollow membrane filament 21 is fixed in the sealing layer 221, and the concentrated water channel needs to pass through the sealing layer 221 and communicate with the concentrated water port 25 at one end of the housing 22, the hollow membrane filament 21 cannot be disposed at the sealing layer 221 where the concentrated water channel is located, the arrangement amount of the hollow membrane filament 21 in the housing 22 will be reduced, and the cleaning capability of the membrane assembly will be affected.

One end of the shell 22 is provided with a first end cover 23, and the other end of the shell 22 is provided with a second end cover 24; the hollow membrane wires 21 are positioned in the shell 22, gaps exist between adjacent hollow membrane wires 21, one end of each hollow membrane wire 21 is arranged in one end of the shell 22, and the other end of each hollow membrane wire 21 is blocked; a water concentration port 25 is arranged on the side surface of one end of the shell 22; the water concentration port 25 is positioned at one side of the inner joint of one end of the hollow membrane wire 21 and one end of the shell 22, the water producing port 29 is positioned at the other side of the inner joint of one end of the hollow membrane wire 21 and one end of the shell 22, and the water producing port 29 is arranged on the first end cover 23; the second end cover 24 is provided with a water inlet channel 26 and an air inlet channel 27, and the aeration device is positioned in the second end cover 24 and is communicated with the water inlet channel 26 and the air inlet channel 27; the air intake passage 27 communicates with the air intake 15 of the aeration device.

The first end cover 23, the second end cover 24 and the housing 22 may be detachably connected, fixedly connected or integrally formed, and in practical application, the setting relationship may be determined according to comprehensive consideration of manufacturing process cost and the like.

The working flow of the membrane component is as follows: in the raw water treatment process, raw water enters the module assembly from the water inlet channel 26 through the aeration device, at the moment, the water concentration port 25 and the water production port 29 are opened, the raw water gradually rises to the membrane assembly from the other end of the plugged hollow membrane wire to be filled with raw water, the water concentration port 25 is closed, the water passes through the membrane holes of the hollow membrane wire 21 under the action of pressure, pollutants are trapped on the outer side of the hollow membrane wire 21, and purified water flows out from the water production port 29 at one end of the hollow membrane wire 21, so that the filtration of the raw water is completed.

One end of the hollow membrane wire 21 is fixed, the other end is blocked, and a free discrete type packaging mode is adopted, so that the inner flow passage of the membrane assembly can be widened, the dead angle of pollution blocking is reduced, and the cleaning effect is improved conveniently. By utilizing the aeration cleaning effect of the aeration device, the effect of reducing energy consumption can be achieved, the cleaning effect can be greatly improved by large-flow large bubbles generated by the aeration device, and the reciprocating impact effect formed by the large bubbles can also eliminate the problem of fouling at the upper end of the membrane component. The central tube is omitted from the shell 22 of the membrane module, so that more hollow membrane wires 21 can be filled in the shell 22, and the membrane filling area of the membrane module is increased.

A sealing adhesive layer 221 is arranged in one end of the shell 22, one end of the hollow membrane wire 21 is arranged in the sealing adhesive layer 221, and the other end of the hollow membrane wire 21 is blocked; the side of one end of the shell 22 is provided with a water concentration port 25, and the water concentration port 25 is adjacent to one end of the sealing glue layer 221 away from the first end cover 23.

The aeration device and the second end cover 24 are detachably connected, so that on one hand, the installation is convenient, on the other hand, in a gap between the water treatment and cleaning period of the membrane module, the aeration device can be directly detached and replaced by a new aeration device, and the normal operation of the membrane module is not delayed by direct installation. The detached aeration device can be used for next replacement after being maintained or cleaned.

And the aerator further comprises a sealing cover 242, the water inlet channel 26 is positioned on the sealing cover 242, the sealing cover 242 is connected with the end cover two 24, the water inlet channel 26 is positioned on the sealing cover 242, and the air inlet channel 27 is communicated with the air inlet 15 of the aerator. The water inlet channel 26 is used for introducing raw water to be treated into the membrane module, the air inlet channel 27 is used for introducing cleaning gas into the aeration device, and the selection of the cleaning gas is not particularly required or limited according to the embodiment of the aeration device, but can be selected according to the requirement if additional cleaning is required, and further supplementary explanation can be made here. The end cap 242 may be fixedly connected to the second end cap 24 or may be detachably connected to the second end cap, and the detachable mounting is convenient for regular detachment and maintenance. The sealing cover 242 is arranged without arranging a channel for air inlet and water inlet on the aeration device, and the sealing cover 242 is respectively communicated with raw water to be treated and gas for cleaning through the water inlet channel 26 and the air inlet channel 27.

The distance between the top of the air distribution unit 14 and the other end of the hollow membrane wires 21 is 50-150mm; for specific applications, values of 50cm, 60cm, 130cm, 140cm, 150cm, etc. can be used. For further limiting the impact of bubbles generated by the air distribution unit 14 on the blocking end of the hollow membrane wire 21 so as not to disturb the hollow membrane wire 21 and influence the cleaning and filtering effects.

The closure cap 242 includes a closure support 243, the closure support 243 is disposed around the inside of the closure cap 242, a total air inlet passage 244 is disposed on the closure support 243, and the total air inlet passage 244 is provided with a total air inlet 245 for supplying air to the air inlet 15.

If the aeration device includes the first air inlet 151 and the second air inlet 152, the air inlet 26 includes the first air inlet channel which is communicated with the first air inlet 151, and the second air inlet channel which is communicated with the second air inlet 152, the sealing cover 242 includes the sealing support 243, the first air inlet channel and the second air inlet channel are both disposed on the sealing support 243, the first air inlet channel is provided with the first air inlet, and the second air inlet channel is provided with the second air inlet. To ventilate to two gas paths respectively, if only has the total air inlet 245, the first air inlet 151 and the second air inlet 152 are all communicated with the total air inlet 245, and because the ventilation time of the two gas paths can not be overlapped, the same cleaning effect can be realized by intermittently controlling the opening and closing of the valves on the first air inlet 151 and the second air inlet 152.

Example 3

A sewage treatment system comprising a membrane module according to any one of embodiments 2, further comprising a sewage pipe, a water production pipe, a concentrate pipe and an air intake pipe; the sewage pipe is communicated with the water inlet channel 26, the water producing pipe is communicated with the water producing port 29, the water concentrating pipe is communicated with the water concentrating port 25, the sewage pipe is provided with a sewage pump, and the air inlet pipe is communicated with the air inlet channel 27.

The water concentration mouth 25 and the water producing mouth 29 are opened, raw water to be treated is pumped into the water inlet channel 26 through a sewage pipe by a sewage pump, then the raw water is conveyed into the membrane assembly, after the raw water is filled into the membrane assembly, the water concentration mouth 25 is closed, the water passes through the membrane holes of the hollow membrane wires 21 under the pressure effect, one end of the hollow membrane wires 21 is discharged to the water producing mouth 29, and pollutants are trapped outside the membrane.

And further comprises a three-way joint which is respectively communicated with the water producing port 29, the water producing pipe and the vent pipe. The water producing pipe is used for conveying out purified water formed by filtering the membrane component during the filtration of raw water; and a breather pipe for introducing gas into the hollow membrane wire 21 through the water producing port 29 during cleaning of the membrane assembly, loosening and falling off the contaminants attached to the outside of the hollow membrane wire 21 for cleaning the membrane assembly, wherein the water concentrating pipe is used for discharging water passing through the water concentrating port 25, and the air inlet pipe is used for conveying the water into the air inlet channel 27. The tee joint plays a role in separating the waterway and the air channel, facilitates the control operation of the membrane assembly in different working modes, meets the control requirements during filtration and cleaning, and can meet different backwashing methods.

If the aeration device comprises a first air inlet 151 and a second air inlet 152, the air inlet pipe comprises a first air inlet pipe and a second air inlet pipe, and the first air inlet pipe is communicated with the first main air inlet, the first air inlet channel and the first air inlet 151; the second air inlet pipe is communicated with the second total air inlet, the second air inlet channel and the second air inlet 152. So as to convey gas to different independent gas paths in the aeration device, and during the cleaning of the membrane assembly, the two gas paths are conveniently controlled to generate bubbles in a time-division mode, and when the opening directions of the first gas distribution port 161 and the second gas distribution port 162 are opposite, the technical effect of cleaning the membrane assembly in the positive and negative directions can be realized in a time-division mode, so that the cleaning effect of the membrane assembly is better.

The sewage treatment system further comprises a controller, wherein the controller is connected with the sewage pump, a valve on a water production pipe, a valve on a vent pipe, a valve at a water concentration port 25, a valve at a water inlet channel 26 and a valve at an air inlet channel 27; or is connected with valves on the first air inlet pipe and the second air inlet pipe. The controller controls the sewage pump and the opening and closing of each valve so as to realize the transportation of raw water, and the opening and closing of each opening and channel; before the related equipment or system of the membrane component is used or before leaving the factory, a control program is burnt into the controller, so that the periodic switching of the membrane component in two working modes of filtering and cleaning can be realized, the filtering effect and the cleaning effect in different working modes can be realized, and the running state of automatic unmanned control can be realized.

Example 4

A method of cleaning a membrane module comprising: when the set filtering time T1 is reached, back flushing is carried out: closing the water inlet channel 26, opening the water concentration port 25, introducing gas into the water production port 29 for a time of T2, allowing the gas to enter the inner hole of the hollow membrane wire 21, and pressing out the residual moisture in the hollow membrane wire 21;

and (3) aeration cleaning: closing the water producing port 29, opening the air inlet channel 27, introducing air into the air inlet 15, discharging air bubbles generated by the aeration device from the air distribution port 15, closing the water concentrating port 25 after the cleaning of the hollow membrane wires 21 for T3, and opening the water inlet channel 26 to discharge sewage.

After one raw water filtering period of the membrane assembly is completed, namely when the set filtering time T1 is reached, the sequence of the back flushing and the bottom aeration cleaning can be exchanged, and the first mode is that the back flushing is firstly carried out and then the bottom aeration cleaning is carried out. The second mode is that the bottom aeration cleaning is firstly carried out, and then the back flushing is carried out. After the cleaning cycle is completed, the next raw water treatment cycle is re-entered.

Cleaning cycle alternatives for specific embodiments: after the set filtering time T1 is reached, a cleaning cycle is started, the first step is to perform bottom aeration cleaning, close the water producing port 29 and the water inlet channel 26, open the air inlet channel 27 and the water concentrating port 25, gas enters the large bubble aeration device from the bottom, accumulates in the gas storage box 11, when gas sequentially flows from the top of the gas storage box 11, the inner box 12 and reaches the bottom of the inner box 11, and accumulates at the air hole at the other end of the hollow tube 13, the stored gas is instantaneously discharged from the hollow tube 13, and after being shunted by the main channel 17 and the air distributing channel 18 of the air distributing unit 14, air bubbles are discharged from the air distributing port 16, and the hollow membrane wires 21 are subjected to flushing cleaning. Then the water concentration port 25 and the air inlet channel 27 are closed, the water producing port 29 and the water inlet channel 26 are opened, at this time, membrane produced water enters the inner hole of the hollow membrane wire 21 from the water producing port 29, and passes through the membrane hole to reach the outer side of the hollow membrane wire 21 under the action of pressure, so that the pollutants attached to the hollow membrane wire 21 are loosened and fall off, and the cleaned sewage is discharged from the water inlet channel 26. After the cleaning cycle is completed, the next raw water treatment cycle is re-entered.

During back flushing, the gas is introduced into the water producing port 29 for a period of time T2, and the set value of the time T2 may be: until the water is not discharged from the water concentration port 25, a time value is taken to set the backwashing time T2 according to the past engineering experience.

Or the time T2 of back flushing is not particularly limited, and the gas is stopped from being introduced into the water producing port 29 when the water outlet 25 is directly judged to be not discharged, and the judgment means for the water outlet 25 is as follows: the controller is connected with the flowmeter at the position of the concentrate pipe or the concentrate nozzle, and when the controller receives that the flow detected by the flowmeter is 0, the controller judges that: the water-concentrating nozzle 25 can not discharge water, the gas is stopped from being introduced into the water-producing nozzle 29, and the back flushing is finished.

When the bottom is aerated and cleaned, gas enters the air inlet 15 of the aeration device through the air inlet channel 27, sequentially passes through the air storage box 11, the inner box 12, the hollow pipe 13 and the air distribution unit 14, and undergoes a siphon effect, bubbles are discharged from the air distribution opening 16, and the bubbles scour and clean the hollow membrane wires 21.

For the case that the aeration device is provided with a plurality of independent air paths, the method for cleaning the membrane component by using the aeration device comprises the following steps: s1, introducing gas into a gas inlet of an ith independent part, discharging bubbles generated by an aeration device from a gas distribution port in the ith direction, and cleaning a hollow membrane wire for T4i time; stopping introducing gas into the gas inlet of the ith independent part, repeating the steps S1 to j for N times after T42 time, wherein N is more than or equal to 2, i, j and N are integers, and i is less than or equal to N until the cleaning time reaches the end of T4.

Wherein, the liquid crystal display device comprises a liquid crystal display device,

in a cleaning time T4, j is the number of repeated work of N gas paths; t42 is the interval time of the ventilation of different groups of gas paths, namely the time of stopping between the two gas paths when the gas distribution ports in different groups of directions discharge bubbles in adjacent time. The controller controls the bubbles discharged by the N groups of air distribution openings 16 to be continuously washed in an intermittent and alternating mode, so that the hollow membrane wires 21 can be thoroughly cleaned, the order of the hollow membrane wires 21 can not be disturbed by matching with the arrangement of the opening directions of the air distribution openings 16, and the filtering and cleaning capacity of the hollow membrane wires 21 is not affected.

When the aeration device with two paths of air paths is selected for flushing, the bottom aeration cleaning process comprises the following steps: closing the water producing port 29, opening the first air inlet channel, introducing air into the first air inlet 151, discharging bubbles generated by the aeration device from the first air distribution port 161, cleaning the hollow membrane wires for T31, and closing the first air inlet channel; after the time T32, opening a second air inlet channel, introducing air into the second air inlet 152, discharging air bubbles generated by the aeration device from the second air distribution port 162, cleaning the hollow membrane wires 21 for T33, and closing the second air inlet channel; closing the water concentration port 25, and opening the water inlet channel 26 to discharge sewage; repeating the above process until the cleaning time reaches the end of T3; wherein t3=xt31+2yt32+zt33, and x, y, z are positive integers.

Because the openings of the first air distribution opening 161 and the second air distribution opening 162 are different in orientation, the directions of air bubbles discharged from the two openings are different, and the hollow membrane wires 21 can be washed and cleaned in different directions, so that the cleaning effect is further improved, and the membrane assembly is cleaned more cleanly. The washing time and the washing times in different directions are generally kept consistent, namely x, z and y respectively represent the positive and negative washing times and the positive and negative washing intermittent times, and the values of the three are the same. The values of T31 and T33 are the same, T31, T33 and T32 respectively represent the positive and negative cleaning time and the positive and negative cleaning intermittent time, and the values of the T31, the T33 and the T32 can be set according to experience judgment. The intermittent forward and backward flushing and cleaning can be formed by the control of the controller, so that the cleaning effect is improved.

Referring to fig. 7, the aeration cleaning method for the two paths of air paths specifically comprises the following steps:

the controller controls the valve at the water producing port 29 to be closed so as to close the water producing port 29, and controls the first air path: valves are arranged on at least one of the first air inlet pipe, the first total air inlet, the first air inlet channel and the first air inlet 151, so that the controller controls the valves to be opened, so that gas sequentially enters the first air storage cavity 111, the first inner box cavity 121, the first hollow pipe 131, the first air distribution cavity 171 and the first air distribution channel 181 through the first air inlet pipe, bubbles are discharged from the first air distribution cavity 161, scouring and cleaning are carried out on the hollow membrane wires 21 in the membrane assembly, the process time is T31, and the controller controls the valves arranged on at least one of the first air inlet pipe, the first total air inlet, the first air inlet channel and the first air inlet 151 to be closed.

After the intermittent time T32, for the control of the second gas path: a valve is arranged at least one position of the air inlet pipe II, the total air inlet II, the air inlet channel II and the air inlet 152 so that the controller controls the valve to be opened, so that gas sequentially enters the air storage cavity II 112, the inner box cavity II 122, the hollow pipe II 132, the air distribution cavity II 172 and the air distribution channel II 182 through the air inlet pipe II, the air distribution cavity II 172 and the air inlet 152, bubbles are discharged from the air distribution port II 162, the hollow membrane wires 21 in the membrane assembly are washed and cleaned, the process time is T33, and the controller controls the valve arranged at least one position of the air inlet pipe II, the total air inlet II, the air inlet channel II and the air inlet II 152 to be closed; the water concentration port 25 is closed, and the water inlet passage 26 is opened to discharge sewage.

Repeating the control of the first air path after the intermittent time T32, and repeating the control of the second air path after the intermittent time T32, and sequentially cycling until the cleaning time reaches the end of T3; and (3) entering the next raw water treatment period, and filtering raw water to be treated through the membrane assembly.

T3=xt31+2yt32+zt33, where x, y, z are positive integers and represent the number of cleaning cycles and the number of intermittent cycles of the first and second circuits, respectively; t31 represents the control time of the first air path; t32 represents a tact time; t33 represents the control time of the second air path. When the openings of the first air distribution opening 161 and the second air distribution opening 162 face opposite directions, namely, T31 and T33 respectively represent the cleaning time in the forward and reverse directions.

It should be noted that the first air channel and the second air channel are not communicated with each other, the air inflow of the first air inlet 151 and the second air inlet 152 should be kept consistent, the volumes of the first air storage cavity 111 and the second air storage cavity 112 are the same, the frequency of the clockwise flushing (forward flushing) and the anticlockwise flushing (reverse flushing) is consistent, when the first air channel and the second air channel enter the gas flushing stage, the first air channel and the second air channel are controlled by valves, the two air inlets are opened for a certain time difference, namely the intermittent time, at the moment, the clockwise flushing and the anticlockwise flushing cannot simultaneously occur, so that the clockwise flushing and the anticlockwise flushing can be periodically and alternately performed.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims (10)

1. An aeration device for a membrane module, comprising: the gas storage box, the inner box, the hollow pipe and the gas distribution unit, wherein,

The inner box and the hollow pipe are both positioned in the gas storage box, the hollow pipe is positioned in the inner box, the gas distribution unit is positioned outside one end of the gas storage box, the other end of the gas storage box is provided with a gas inlet, the gas storage box is communicated with one end of the inner box, and the other end of the inner box is closed;

one end of the hollow pipe is communicated with the inside of the other end of the inner box, and the other end of the hollow pipe is communicated with the air distribution unit;

the gas distribution unit is provided with a gas distribution port.

2. An aeration device for a membrane module according to claim 1, wherein the opening direction of the gas distribution opening is tangential to a circumscribed circle of the hollow tube.

3. An aeration device for a membrane module according to claim 1, wherein the gas distribution unit comprises a main channel and a gas distribution channel, the main channel is communicated with the hollow tube, one end of the gas distribution channel is communicated with the main channel, and a gas distribution port is arranged at the other end of the gas distribution channel.

4. An aeration device for a membrane module according to claim 1, further comprising a water distribution channel provided at an edge of the air storage box.

5. An aeration device for a membrane module according to claim 3, wherein said air distribution passage is curved.

6. The aeration device of a membrane assembly according to claim 1, wherein the gas distribution unit is provided with N groups of gas distribution openings with different opening directions, the gas inlet of the gas storage box, the inner box and the hollow pipe are divided into N independent parts, and the respective independent parts of the gas inlet of the divided gas storage box, the inner box and the hollow pipe are sequentially communicated to form N independent gas paths, and are respectively communicated with the N groups of gas distribution openings with different opening directions on the gas distribution unit, wherein N is greater than or equal to 2, and N is an integer.

7. A membrane module comprising the aeration device of any one of claims 1 to 6, further comprising: a hollow membrane wire and a shell, wherein,

the hollow membrane wires are positioned in the shell, one end of each hollow membrane wire is arranged in one end of the shell, and the other end of each hollow membrane wire is free and blocked;

the shell is provided with a water concentration port, a water production port and a water inlet channel;

an aeration device is arranged in the shell.

8. The membrane module according to claim 7, wherein a sealing layer is provided inside one end of the housing, and one end of the hollow membrane wire is fixed in the sealing layer.

9. The membrane module according to claim 7, wherein the water concentration port is provided on a side of the housing between one end and the other end of the hollow membrane wire, or a water concentration channel is provided inside one end of the housing, and the water concentration channel is communicated with the water concentration port at one end of the housing.

10. A sewage treatment system comprising a membrane module according to any one of claims 7 to 9, further comprising a sewage pipe, a water production pipe, a concentrate pipe and an air intake pipe; the sewage pipe is communicated with the water inlet channel, the water producing pipe is communicated with the water producing port, the concentrated water pipe is communicated with the concentrated water port, and the air inlet pipe is communicated with the air inlet channel.

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