CN110734126B

CN110734126B - Air distribution device and biological aerated filter

Info

Publication number: CN110734126B
Application number: CN201810790897.0A
Authority: CN
Inventors: 莱豪; 安平林; 王冠平; 牛涛; 沈爱莲; 张江生
Original assignee: Everbright Water Technology Development Nanjing Co ltd; Jiangsu Tongyong Environment Engineering Co ltd; Yijiabi Environmental Protection Technology Nanjing Co ltd; Everbright Water Shenzhen Co ltd
Current assignee: Guangda Water (Shenzhen) Co., Ltd.; Guangda water science and technology development (Nanjing) Co., Ltd.; JIANGSU TONGYONG ENVIRONMENTAL PROTECTION GROUP CO., LTD.; Yijiabi environmental protection technology (Nanjing) Co., Ltd
Priority date: 2018-07-18
Filing date: 2018-07-18
Publication date: 2022-03-08
Anticipated expiration: 2038-07-18
Also published as: CN110734126A

Abstract

The invention relates to the technical field of biological aerated filters, and provides a gas distribution device which comprises a tank body with a liquid storage cavity, wherein a partition plate is arranged in the liquid storage cavity, the partition plate divides the liquid storage cavity into an upper liquid cavity and a lower liquid cavity, a gas supply pipeline communicated with the outside is arranged in the lower liquid cavity, a flow diverter is arranged on the gas supply pipeline, the flow diverter is provided with a gas flow channel used for guiding gas flow in the gas supply pipeline to the lower part of the partition plate, a flow director is arranged on the partition plate, and the flow director is provided with a conveying channel communicated with the upper liquid cavity and the lower liquid cavity. According to the gas distribution device provided by the invention, after the gas leaves the flow diverter, the gas floats upwards to the partition plate in the lower liquid cavity, and the gas cushion layer is formed at the bottom of the partition plate, so that the gas is uniformly distributed below the partition plate, and the gas in the gas cushion layer is guided into the upper liquid cavity through the flow diverter, so that the uniformity of the gas output from the flow diverter is greatly improved.

Description

Air distribution device and biological aerated filter

Technical Field

The invention belongs to the technical field of biological aerated filters, and particularly relates to an air distribution device and a biological aerated filter.

Background

A Biological Aerated Filter (BAF for short) is a novel sewage treatment process by a biofilm method, which is developed in Europe and America at the end of the 80 s. The surface of the filter material is attached with a growth biological membrane, and the supporting layer in the filter tank is injected with gas to realize aeration (usually, an aeration pipe is buried). The air distribution device is one of the components of the aeration biological filter and is a device for generating dissolved oxygen by realizing aeration. When sewage flows through, pollutants, dissolved oxygen and other substances are firstly diffused to the surface and the interior of the biological membrane through a liquid phase, and the sewage is quickly purified by utilizing the strong oxidative degradation capability of the high-concentration biological membrane on the filter material, which is a biological oxidative degradation process; meanwhile, when sewage flows through, the filter material is in a compacted state, a large amount of suspended matters in the sewage are intercepted by utilizing the characteristic of small particle size of the filter material and the biological flocculation effect of the biological membrane, and the dropped biological membrane is ensured not to float out along with the water, which is the interception effect; after the operation for a certain time, the microorganisms fall off along with the circulation of the growth period, and the fallen biological membrane causes hardening and blocking of the filter material, so that the filter chamber needs to be backwashed. However, in both the aeration process and the back washing process, the gas is distributed unevenly in the filter, which often causes hardening of the filter material and seriously affects the working efficiency of the filter.

Disclosure of Invention

The invention aims to provide an air distribution device to solve the technical problem of uneven distribution of air in a filter during aeration in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a gas distribution device, including the cell body that has the stock solution chamber, the stock solution intracavity is provided with the baffle, the baffle will the stock solution chamber is separated and is formed sap cavity and lower sap cavity, the sap cavity is provided with the gas supply line with outside intercommunication down, the last drainage ware that is provided with of gas supply line, the drainage ware have be used for with the inside air current of gas supply line guides extremely the airflow channel of baffle below, be provided with the divertor on the baffle, the divertor has the intercommunication the transfer passage of upper strata liquid chamber and lower sap cavity.

Furthermore, the air inlet end of the flow diverter is inserted into the air supply pipeline, and the air outlet end of the flow diverter is positioned between the air supply pipeline and the partition plate.

Further, the inlet end of flow diverter is less than the distance between the inner wall bottom of gas supply line the inlet end is less than the distance between the inner wall top of gas supply line.

Further, the air flow channel extends in the direction of gravity.

Further, the area of the cross section of the air flow passage is smaller than the area of the cross section of the air supply duct.

Furthermore, the outer side wall of the gas supply pipeline is provided with a convex edge, and the convex edge is fixed on the inner wall of the liquid storage cavity.

Further, the air supply pipeline is connected with the inner wall of the liquid storage cavity through a buffer piece.

Furthermore, the quantity of flow diverter is a plurality of, and is a plurality of the flow diverter is followed gas supply line's extending direction evenly lays.

Furthermore, the number of the fluid directors is multiple, the fluid directors are arranged in a matrix manner, and the air outlet of the fluid director is positioned below an area defined by the adjacent four fluid directors.

The invention also provides an aeration biological filter, which comprises the air distribution device, wherein a bearing layer is laid on the partition plate, a filter material layer is laid above the bearing layer, and the air outlet end of the fluid director is positioned below the filter material layer.

The gas distribution device provided by the invention has the beneficial effects that: compared with the prior art, the gas distribution device has the advantages that the upper liquid cavity and the lower liquid cavity are filled with liquid, gas is filled into the gas supply pipeline from the outside, the gas is guided to the lower part of the partition plate through the flow guider, the gas can float upwards to the partition plate in the lower liquid cavity after leaving the flow guider, the bottom of the partition plate is provided with the gas cushion layer, the gas is uniformly distributed below the partition plate through the gas cushion layer, and the gas flow guider in the gas cushion layer is guided into the upper liquid cavity, so that the uniformity of the gas output from the gas guider is greatly improved. Particularly, when the number of the fluid directors is plural, and the plural fluid directors output the gas in the gas cushion layer to the upper liquid chamber respectively, since the thickness of the gas cushion layer below the partition is uniform, the gas flow output from each fluid director is very uniform and stable.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic front view of an air distribution device according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of an installation of a gas supply duct and flow diverter provided by an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a gas supply duct and flow diverter provided by an embodiment of the present invention;

fig. 4 is a front view schematically illustrating a fluid director according to an embodiment of the present invention;

fig. 5 is a schematic top view of a baffle with a deflector according to an embodiment of the present invention mounted thereon.

Wherein, in the figures, the respective reference numerals:

1-a pool body; 11-a separator; 12-upper fluid chamber; 13-lower fluid chamber; 2-a gas supply pipeline; 21-convex edge; 211-a boss; 212-a connecting portion; 3-a drainage device; 4-a fluid director; 41-a set of ventilation holes; 411-upper vent; 412-lower vent; 5-buffer member.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying 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 is therefore not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Referring to fig. 1 to 5, an air distribution device according to the present invention will now be described. The gas distribution device comprises a tank body 1 with a liquid storage cavity (not shown), a partition plate 11 is arranged in the liquid storage cavity, the partition plate 11 divides the liquid storage cavity into an upper liquid cavity 12 and a lower liquid cavity 13, a gas supply pipeline 2 communicated with the outside is arranged in the lower liquid cavity 13, a flow diverter 3 is arranged on the gas supply pipeline 2, the flow diverter 3 is provided with a gas flow channel (not shown) used for guiding gas flow in the gas supply pipeline 2 to the lower side of the partition plate 11, a flow deflector 4 is arranged on the partition plate 11, and the flow deflector 4 is provided with a conveying channel (not shown) communicated with the upper liquid cavity 12 and the lower liquid cavity 13. Thus, liquid is injected into the upper liquid cavity 12 and the lower liquid cavity 13, gas is injected into the gas supply pipeline 2 from the outside, the gas is guided to the lower part of the partition plate 11 through the flow guider 3, the gas can float up to the partition plate 11 in the lower liquid cavity 13 after leaving the flow guider 3, and an air cushion layer is formed at the bottom of the partition plate 11 (the air cushion layer refers to a gas layer which is formed below the partition plate 11 and cannot float up continuously under the blocking of the partition plate 11), the gas is uniformly distributed below the partition plate 11 through the air cushion layer, and the gas in the air cushion layer is guided into the upper liquid cavity 12 through the flow guider 4, so that the uniformity of the gas output from the flow guider 4 is greatly improved. Especially when the number of the fluid directors 4 is plural, and the plural fluid directors 4 output the gas in the air cushion layer to the upper liquid chamber 12, respectively, since the thickness of the air cushion layer below the partition plate 11 is uniform, the gas flow output from each of the fluid directors 4 is very uniform and stable.

Wherein, whether the flow diverter 3 aerates (aeration means that the gas from the flow diverter 3 supplies gas to the liquid in the upper liquid cavity 12 after passing through the flow diverter 4) or backflushs (backwashing means that the gas from the flow diverter 3 flushes the liquid or other objects in the upper liquid cavity 12 after passing through the flow diverter 4), the same gas supply pipeline 2 is adopted, the flow is the same, the difference is that the gas flow in the gas supply pipeline 2 is larger than the gas flow when the filter material layer is aerated during backflushing, thereby saving a great deal of cost.

Wherein, gas supply line 2 and outside intercommunication, the outside can be to gas supply line 2 injection gas: an external gas source (not shown) injects gas into the gas supply duct 2. Optionally, the gas supply pipeline 2 is connected with a fan, and after the fan is started, the fan injects gas into the gas supply pipeline 2, so that the operation is very convenient.

Wherein, cell body 1 has the stock solution chamber, and the stock solution chamber can hold liquid. Optionally, the cross section of the tank body 1 is circular or rectangular, so that the circular partition plate 11 or the rectangular partition plate 11 is easier to install and produce due to the need of arranging the partition plate 11 in the tank body 1.

Wherein, be provided with baffle 11 in the liquid storage chamber, baffle 11 separates the liquid storage chamber and forms last liquid cavity 12 and lower liquid cavity 13. Optionally, the inner wall of the liquid storage cavity is sealed with the partition plate 11 to prevent gas in the air cushion layer from permeating between the inner wall of the liquid storage cavity and the partition plate 11, and the flow of gas or liquid between the upper liquid cavity 12 and the lower liquid cavity 13 is communicated through the flow guider 4.

Wherein the flow diverter 3 has an air flow channel which is capable of directing the air flow inside the air supply duct 2 below the partition 11. Therefore, the flow diverter 3 guides the gas in the gas supply pipeline 2 out and then enters the lower liquid cavity 13, and disturbance to the gas in the gas supply pipeline 2 when the gas flow flows out of the gas supply pipeline 2 is reduced. Because if the gas in the gas supply pipeline 2 directly penetrates through the side wall of the gas supply pipeline 2 (the gas in the gas supply pipeline 2 penetrates through the side wall of the gas supply pipeline 2 in a mode that air holes are formed in the side wall of the gas supply pipeline 2), the liquid in the lower liquid chamber 13 can directly enter the gas supply pipeline 2 through the air holes and seriously damage the gas supply pipeline 2, and meanwhile, when the gas in the gas supply pipeline 2 penetrates through the side wall of the gas supply pipeline 2 and is injected into the lower liquid chamber 13, cyclone or bubbles can be generated at the air holes, and the stability of the gas flow in the gas supply pipeline 2 can be disturbed. Optionally, in one embodiment, the flow diverter 3 is a hollow pipe, the inner cavity of the hollow pipe is communicated with the inside of the gas supply pipe 2, and the gas outlet end of the hollow pipe is located at the outer side of the gas supply pipe 2, so that when gas flows out of the hollow pipe, the disturbance at the gas outlet end of the hollow pipe does not interfere with the gas flow state inside the gas supply pipe 2.

Wherein, the fluid director 4 is provided with a conveying channel which is communicated with an upper fluid cavity 12 and a lower fluid cavity 13. The air inlet end of the fluid director 4 is positioned in the lower liquid cavity 13, and the top end of the air outlet end of the fluid director 4 is positioned in the upper liquid cavity 12. Optionally, the air inlet end of the air deflector 4 is provided with an air vent group 41, the air vent group 41 is communicated with the conveying channel of the air deflector 4, and the air vent group 41 is arranged at intervals with the bottom surface of the baffle plate 11. Thus, the gas from the gas outlet end of the flow guider 4 forms a gas cushion layer at the bottom of the partition plate 11, until the thickness of the gas cushion layer exceeds the distance between the vent hole group 41 and the partition plate 11, the gas in the gas cushion layer starts to pass through the vent hole group 41 and enter the upper liquid cavity 12 after passing through the conveying channel. Wherein, keep the air cushion layer that the thickness is the interval between baffle 11 and the venthole group 41, when the gas that the drainage ware 3 was injected into in lower sap cavity 13 floats to the below of baffle 11 and gets into the air cushion layer, the air cushion layer has played the effect of buffering.

Specifically, in one embodiment, the vent set 41 includes an upper vent 411 and a lower vent 412, with the upper vent 411 being located between the lower vent 412 and the partition 11. When the flow diverter 3 starts to inject gas into the lower liquid chamber 13, the gas cushion layer below the partition plate 11 becomes thicker and thicker until the gas cushion layer is contacted with the upper vent holes 411, the gas in the gas cushion layer starts to enter the flow guider 4 through the upper vent holes 411 and input the gas into the upper liquid chamber 12, if the gas supply amount of the flow diverter 3 is increased, the thickness of the gas cushion layer continues to increase until the gas cushion layer is contacted with the lower vent holes 412, the gas in the gas cushion layer also enters the flow guider 4 through the lower vent holes 412 and is exhausted into the upper liquid chamber 12, and the flow rate of the gas flow output from the flow guider 4 is further increased. Optionally, the aperture of the upper vent 411 is smaller than the lower vent 412.

Wherein, optionally, in one embodiment, the flow velocity of the gas in the flow diverter 3 is 10-30 m/s.

Further, referring to fig. 1 to 5, as an embodiment of the air distribution device provided by the present invention, an air inlet end of the flow diverter 3 is inserted into the air supply duct 2, and an air outlet end of the flow diverter 3 is located between the air supply duct 2 and the partition plate 11. So, the inlet end setting of flow diverter 3 is inside gas supply duct 2, and the flow diverter 3 of being convenient for can acquire gas from gas supply duct 2 steadily. In addition, when the air inlet end of the flow diverter 3 is inserted into the air supply pipeline 2, the air inlet end can obtain air in a larger angle range (assuming that the reverse direction of the airflow direction is the forward direction when the air inlet end enters air, the air in front of the air inlet end can enter the air inlet end, and the air on the side or even the rear side of the air inlet end can enter the air inlet end, so that the capacity of the air inlet end for obtaining air from the ventilation pipeline is greatly increased).

In addition, the air outlet end of the flow diverter 3 is positioned between the air supply pipeline 2 and the clapboard 11. The distance that the gas that comes out in the gas supply pipeline 2 can be shortened to flow diverter 3 reaches baffle 11, has reduced the gas that comes out in the end of giving vent to anger of flow diverter 3 and has come up to baffle 11 below and get into the produced impact force to the air cushion layer when the air cushion layer.

Optionally, the distance between the air outlet end of the flow guider 3 and the partition plate 11 is 100 mm-150 mm.

Further, referring to fig. 1 to 5, as an embodiment of the air distribution device provided by the present invention, the distance between the air inlet end of the flow diverter 3 and the bottom of the inner wall of the air supply duct 2 is smaller than the distance between the air inlet end and the top of the inner wall of the air supply duct 2. In this way, the supply air duct 2, during use, generates more or less water vapour or even liquid water inside the supply air duct 2. And the air inlet end of the flow diverter 3 is positioned in the lower half part of the inner cavity of the air supply pipeline 2 relative to the air supply pipeline 2, so that the water vapor or liquid water in the air supply pipeline 2 can be timely conveyed out of the air supply pipeline 2 through the flow diverter 4, and the blocking of the air supply pipeline 2 is prevented. The "distance between the air inlet end of the flow diverter 3 and the inner wall of the air supply duct 2" discussed in the present embodiment, more specifically, refers to: "distance between the air inlet of the flow diverter 3 and the inner wall of the air supply duct 2". Optionally, the gas supply duct 2 is horizontally placed. In this way, the gas distribution in the gas supply duct 2 in its direction of extension is relatively uniform.

Further, referring to fig. 1 to 5, as an embodiment of the air distribution device provided by the present invention, the air flow channel extends in the direction of gravity. In this way, the gas flow channel extends in the direction of gravity, so that the moving direction of the gas when leaving the gas flow channel is the direction opposite to the direction of gravity, and the gas will continue to float upwards after leaving the gas flow channel in the direction opposite to the direction of gravity, thereby reducing the disturbance of the gas when leaving the gas flow channel to the surrounding liquid, i.e. the disturbance of the flow diverter 3 to the gas in the gas cushion layer and the flow director 4 when releasing the gas flow.

Further, referring to fig. 1 to 5, as an embodiment of the air distribution device provided by the present invention, the cross-sectional area of the air flow channel is smaller than the cross-sectional area of the air supply duct 2. As such, (it should be noted here that "the cross section of the gas supply duct 2" refers to the cross section of the inner cavity of the gas supply duct 2); in the process that the gas in the gas supply pipeline 2 is output through the gas flow channel, the larger the caliber of the gas flow channel is, the more gas (under the same gas pressure) enters the gas flow channel from the gas supply pipeline 2 in unit time is. The area of the cross-section of the gas flow channel is smaller than the area of the cross-section of the gas supply duct 2, so that too fast a pressure drop in the gas supply duct 2 due to too fast a gas loss does not occur in the gas supply duct 2. Especially when a plurality of flow diverters 3 are provided along the gas supply conduit 2, reducing the specific gravity of the gas obtained from the gas supply conduit 2 by a single flow diverter 3 in the total input to the gas supply conduit 2 enables the gas output from each flow diverter 3 to be more uniform, the gas output from each flow diverter 3 to be more uniform also enables the distribution of the gas cushion layer to be more uniform, and the gas obtained from the gas cushion layer by different flow diverters 4 to be more uniform.

Further, referring to fig. 1 to 5, as an embodiment of the air distribution device provided by the present invention, a protruding edge 21 is disposed on an outer side wall of the air supply duct 2, and the protruding edge 21 is fixed on an inner wall of the liquid storage cavity. So, protruding edge 21 is fixed on the inner wall of stock solution chamber, and protruding edge 21 has played a absorbing effect, and when the gas supply line 2 took place vibrations promptly, gas supply line 2 can transmit this vibrations to the inner wall of stock solution chamber through protruding edge 21 on.

Optionally, the protruding rim 21 extends in the extension direction of the gas supply duct 2. In this way, vibrations occurring at different positions on the supply duct 2 can be quickly transmitted to the flange 21. Meanwhile, if the gas supply pipeline 2 vibrates in a plurality of places, the vibration can make the vibration of the gas supply pipeline 2 more uniform on the whole under the linkage of the convex edge 21.

Further, the ledge 21 includes a convex portion 211 and a connection portion 212 connecting the convex portion 211 and the gas supply duct 2, and an outer surface of the connection portion 212 is tangent to an outer surface of the convex portion 211 and an outer surface of the gas supply duct 2, respectively. In this way, when the gas supply pipeline 2 vibrates, the gas supply pipeline 2 vibrates relatively with the liquid in the lower liquid chamber 13, and the liquid moving along the surface of the convex part 211 can be guided to the outer surface of the gas supply pipeline 2 under the guidance of the connecting part 212, and similarly, the liquid moving along the surface of the gas supply pipeline 2 can be guided to the outer surface of the convex part 211 under the guidance of the connecting part 212, that is, the connecting part 212 can effectively reduce the disturbance of the convex edge 21 on the liquid in the lower liquid chamber 13.

Further, the number of the protruding edges 21 is two, and the two protruding edges 21 are respectively disposed on the side walls of the opposite sides of the air supply duct 2. In this way, the gas supply duct 2 is located between the two convex edges 21, so that when the gas supply duct 2 is subjected to vibration, the vibration is distributed more evenly over the two convex edges 21.

Further, referring to fig. 1 to 5, as an embodiment of the air distribution device provided by the present invention, the air supply pipe 2 is connected to the inner wall of the liquid storage cavity through a buffer 5. Thus, when the gas supply pipeline 2 starts to be filled with gas, the gas can generate a large impact force on the gas supply pipeline 2, and the buffer piece 5 can relieve the impact force on the gas supply pipeline 2.

Optionally, the buffer member 5 is a flexible tube, so that besides the flexibility of the flexible tube itself, the cavity enclosed by the flexible tube can also play a role of shock absorption.

Further, referring to fig. 1 to 5, as an embodiment of the air distribution device provided by the present invention, the number of the flow diverters 3 is multiple, and the multiple flow diverters 3 are uniformly arranged along the extending direction of the air supply duct 2. As such, a plurality of flow diverters 3 are evenly laid along the gas supply duct 2 direction of extension for the gas that is output from flow diverters 3 can form a more uniform air cushion layer below baffle 11.

Further, referring to fig. 1 to 5, as an embodiment of the air distribution device provided by the present invention, the number of the flow deflectors 4 is multiple, the multiple flow deflectors 4 are arranged in a matrix, and the air outlet of the flow deflector 3 is located below an area surrounded by four adjacent flow deflectors 4. Therefore, after the gas is output from the flow diverter 3, the gas forms bubbles in the lower liquid cavity 13 and floats upwards, and the gas outlet of the flow diverter 3 is positioned below the area enclosed by the four adjacent fluid directors 4, so that the floating bubbles can firstly contact with the partition plate 11 in the area between the four adjacent fluid directors 4 and produce a gas cushion layer below the partition plate 11, and the floating bubbles are more stable under the blocking of the partition plate 11, and at the moment, when the gas in the gentle gas cushion layer enters the fluid directors 4 again, the gas flow in the fluid directors 4 is more stable.

Referring to fig. 1 to 5, the present invention further provides a biological aerated filter, which includes an air distribution device, a support layer (not shown) is laid on the partition plate 11, a filter material layer (not shown) is laid above the support layer, and an air outlet end of the air deflector 4 is located below the filter material layer. Due to the adoption of the gas distribution device, liquid is injected into the upper liquid cavity 12 and the lower liquid cavity 13, gas is injected into the gas supply pipeline 2 from the outside, the gas is guided to the lower part of the partition plate 11 through the flow guider 3, the gas can float upwards to the partition plate 11 in the lower liquid cavity 13 after being separated from the flow guider 3, and a gas cushion layer is formed at the bottom of the partition plate 11 (the gas cushion layer refers to a gas layer which is formed below the partition plate 11 and cannot float upwards continuously under the blocking of the partition plate 11), so that the gas is uniformly distributed below the partition plate 11, and the gas in the gas cushion layer is guided into the upper liquid cavity 12 through the flow guider 4, and the uniformity of the gas output from the flow guider 4 is greatly improved. Especially when the number of the fluid directors 4 is plural, and the plural fluid directors 4 output the gas in the air cushion layer to the upper liquid chamber 12, respectively, since the thickness of the air cushion layer below the partition plate 11 is uniform, the gas flow output from each of the fluid directors 4 is very uniform and stable.

Wherein, the filter material layer is a carrier of a biological membrane and has the function of intercepting suspended substances. Optionally, the shape of the filter material is honeycomb tubular, beam-shaped, circular radial, shield-shaped, net-shaped, barrel-shaped, etc., and the adopted filter material mainly comprises porous ceramsite, anthracite, quartz sand, expanded shale, light plastic, expanded aluminosilicate, plastic module, glass fiber reinforced plastic, etc.

Further, in one embodiment, the filter material is made of an inert material (the inert material refers to a material that does not easily react with water or oxygen), so that the filter material can keep stable during the filtering process.

Further, in one embodiment, the filter material is spherical in shape, so that gas and liquid are more uniform when passing through the filter material, and the resistance encountered by water flow when passing through the filter material is small.

Further, in one embodiment, the surface of the filter material is provided with pores or recesses, so that the attachment and growth of microbial membranes are facilitated, and the operation of the biological filter is facilitated.

Further, in one embodiment, the surface of the filter material is hydrophilic and has good anti-backwash capability.

Further, in one embodiment, the filter media is made of a material that is resistant to corrosion, such that the filter media is capable of maintaining its stability during repeated use.

Wherein, the supporting layer is mainly used for supporting the filter material layer, preventing the filter material from flowing and blocking the guide head, and simultaneously keeping the stable operation of backwashing. Optionally, the material used for the bearing layer is pebbles.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. Gas distribution device, including the cell body that has the stock solution chamber, stock solution intracavity is provided with the baffle, the baffle will stock solution chamber separates to form upper liquid chamber and lower liquid chamber, its characterized in that: an air supply pipeline communicated with the outside is arranged in the lower liquid cavity, a flow diverter is arranged on the air supply pipeline, the flow diverter is provided with an air flow channel used for guiding air flow in the air supply pipeline to the lower part of the partition plate, a flow guider is arranged on the partition plate, and the flow guider is provided with a conveying channel communicated with the upper liquid cavity and the lower liquid cavity; after the gas leaves the flow diverter, the gas floats to the partition plate in the lower liquid cavity and forms a gas cushion layer at the bottom of the partition plate.

2. The gas distribution device of claim 1, wherein: the air inlet end of the flow diverter is inserted into the air supply pipeline, and the air outlet end of the flow diverter is positioned between the air supply pipeline and the partition plate.

3. The gas distribution device of claim 2, wherein: the inlet end of the flow diverter is less than the distance between the bottoms of the inner walls of the gas supply pipelines.

4. The gas distribution device of claim 1, wherein: the air flow channel extends in the direction of gravity.

5. The gas distribution device of claim 1, wherein: the area of the cross section of the airflow channel is smaller than that of the cross section of the air supply pipeline.

6. The gas distribution device according to any one of claims 1 to 5, characterized in that: and a convex edge is arranged on the outer side wall of the gas supply pipeline and fixed on the inner wall of the liquid storage cavity.

7. The gas distribution device according to any one of claims 1 to 5, characterized in that: the gas supply pipeline is connected with the inner wall of the liquid storage cavity through a buffer piece.

8. The gas distribution device according to any one of claims 1 to 5, characterized in that: the quantity of drainage ware is a plurality of, and is a plurality of the drainage ware is followed gas supply line's extending direction evenly lays.

9. The gas distribution device according to any one of claims 1 to 5, characterized in that: the air outlet of the flow diverter is positioned below an area defined by four adjacent flow diverters.

10. The biological aerated filter is characterized in that: the air distribution device comprises the air distribution device as claimed in any one of claims 1 to 9, a bearing layer is laid on the partition plate, a filter material layer is laid above the bearing layer, and the air outlet end of the air deflector is positioned below the filter material layer.