A multifunctional aeration device for sewage treatment

Abstract

The present invention relates to the field of sewage treatment, and in particular to a multifunctional aeration device for sewage treatment, including an aeration tank and an air pipe, etc.; a storage chamber is provided in the aeration tank; a plurality of air pipes are provided at the bottom of the aeration tank; each air pipe is connected to an external pumping device. The present invention realizes that the sewage flows to the inside of the collection tank by completely immersing the collection bucket in the sewage, and the scum is driven to flow to the inside of the collection bucket under the action of the water flow, so that when the sewage surface is surging, the scum can still be salvaged through the collection bucket, so as to avoid the scum accumulating on the sewage surface for a long time and affecting the aeration work; the floating blocks that accumulate larger on the sewage surface are separated by the mesh on the pressing net, so that the floating blocks are dispersed and then flow into the collection bucket under the influence of the water flow, thereby improving the collection effect of the scum; the sewage in the transfer cavity is pressed by the baffle, so that the sludge is affected by the water flow and floats, so as to prevent the sludge from accumulating and hardening for a long time, and facilitate the subsequent workers to clean the sludge.

Description

Technical Field

[0001] The invention relates to the field of sewage treatment, and in particular to a multifunctional aeration device for sewage treatment. Background Art

[0002] In the process of sewage treatment, the dissolved oxygen content in sewage is usually increased by an aeration device. During the aeration treatment of sewage, scum will form on the surface of the sewage and sludge will appear at the bottom. The appearance of scum will hinder the escape of air from the sewage. At the same time, the sewage surface during the aeration process will be affected by the escape of bubbles and will surge. This phenomenon is conducive to the entry of air into the sewage to cooperate with the aeration device to treat the sewage. The scum will not only hinder the discharge of bubbles in the sewage, but also prevent the outside air from entering the sewage, affecting the treatment effect of the sewage. The existing method extracts the scum through a pipe flush with the sewage liquid surface, but the sewage liquid surface is affected by bubbles and surges, and the surging water surface carries the scum up and down, resulting in poor collection of scum by the pipe extraction method. When a lot of scum is generated, the surging water surface easily pushes the scum to accumulate together to form floating blocks, which makes the pipe easy to be blocked.

[0003] At the same time, due to the long sewage aeration time, the sludge will be compacted due to its own weight when it accumulates at the bottom of the aeration tank for a long time, forming sludge compaction, which will reduce the effective volume of the aeration tank. Although the upper clear liquid is discharged and the treated sewage is discharged through the drain port at the bottom of the aeration tank, the sludge at the bottom can be brought out by the residual water at the bottom of the aeration tank. However, after the sludge is compacted, a large amount of sludge cannot be taken away through the drainage process, resulting in the need for workers to enter the bottom of the aeration tank for cleaning, which increases the difficulty of cleaning for workers. Summary of the invention

[0004] In order to overcome the shortcomings of the existing pipeline extraction method for collecting scum, which is easily affected by the surging water surface, resulting in poor scum collection effect and the accumulated scum easily causing pipeline blockage, the present invention provides a multifunctional aeration device for sewage treatment.

[0005] The technical implementation scheme of the present invention is: a multifunctional aeration device for sewage treatment, including an aeration tank, an air pipe, a diffuser and a solenoid valve; a storage chamber is arranged in the aeration tank; a plurality of air pipes are arranged at the bottom of the aeration tank; each air pipe is connected to an external pumping device; a plurality of diffusers are installed on each air pipe; a solenoid valve is connected to the bottom of the aeration tank; it also includes a lifting component, a pressure net, a collection bucket, a stirring component and a salvage system; a lifting component is arranged on the aeration tank; a pressure net for collecting scum is installed on the lifting component; the pressure net is driven up and down by the lifting component; a plurality of collection buckets are arranged on the pressure net to prevent scum from affecting sewage treatment; a water level sensor is arranged in each collection bucket; a stirring component for improving sewage aeration effect is installed on each collection bucket; a salvage system for cleaning sludge is arranged on the aeration tank.

[0006] In addition, it is particularly preferred that the stirring assembly includes a fixed rod and a stirring blade; a fixed rod is fixedly connected to the lower side of each collecting barrel; a rotating part is provided on the lower side of each fixed rod; a motor is provided in each fixed rod, and the fixed rod drives the rotating part to rotate through the built-in motor; and each rotating part is fixedly connected to a plurality of stirring blades for improving the aeration effect of sewage.

[0007] In addition, it is particularly preferred that it also includes a first filter screen and a float; a first filter screen is fixedly connected in each collecting barrel; a float is slidably connected to the lower side of each collecting barrel to prevent sewage from driving scum back into the aeration tank; the float is made of a material with a density less than water.

[0008] Furthermore, it is particularly preferred that each stirring blade is arranged in an inclined shape.

[0009] Furthermore, it is particularly preferred that each first filter screen is configured in a cone shape.

[0010] Furthermore, it is particularly preferred that each buoy is configured in an inverted truncated cone shape.

[0011] Furthermore, it is particularly preferred that each collecting bucket and buoy surface is coated with an anti-corrosion coating.

[0012] In addition, it is particularly preferred that the salvage system includes a slip ring, a baffle, a second filter, a fixed plate and an electric gate; a transfer chamber is provided in the aeration tank; a plurality of connecting ports are opened in the aeration tank, and the transfer chamber is connected with the storage chamber through the plurality of connecting ports; a slip ring is slidably connected to the transfer chamber; a plurality of fixed plates are connected to the lifting assembly; the lower side of each fixed plate is fixedly connected to the slip ring; a baffle is fixedly connected to the lower side of the slip ring; a second filter to prevent sewage overflow is fixedly connected in the slip ring; the baffle is made of a material with a density less than that of water; and an electric gate is slidably connected in each connecting port.

[0013] In addition, it is particularly preferred that the cross section of the second filter screen is in an inverted V shape, and the holes on the second filter screen are configured as micro holes.

[0014] Furthermore, it is particularly preferred that the thickness of the bottom of the aeration tank gradually decreases from the outside to the center.

[0015] Beneficial effect: The present invention realizes that the collection bucket is completely immersed in the sewage, so that the sewage flows into the collection bucket, and the scum is driven to flow into the collection bucket under the action of the water flow, so that when the sewage surface surges, the scum can still be salvaged through the collection bucket, thereby preventing the scum from accumulating on the sewage surface for a long time and affecting the aeration work;

[0016] The mesh holes on the pressure net are used to separate the larger floating blocks accumulated on the sewage surface, so that the floating blocks are dispersed and then flow into the collection bucket under the influence of water flow, thereby improving the collection effect of floating scum;

[0017] The baffle plate presses the sewage in the transfer chamber to blow the sewage to the sludge at the bottom of the storage chamber, so that the sludge is affected by the water flow and floats, preventing the sludge from accumulating and hardening for a long time, making it easier for subsequent workers to clean the sludge.

[0018] The sludge is intercepted and collected by the second filter, and workers can clean the sludge salvaged from the second filter without the need for workers to enter the bottom of the aeration tank for cleaning. This reduces the difficulty of cleaning for workers and salvages the sludge produced after sewage aeration, thereby improving the sewage treatment capacity of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the multifunctional aeration device for sewage treatment of the present invention;

[0020] Figure 2 is a cross-sectional view of an aeration tank of the present invention;

[0021] Figure 3 It is a cross-sectional view of the collection barrel of the present invention;

[0022] Figure 4 It is a schematic diagram of the three-dimensional structure of the slip ring and baffle assembly of the present invention;

[0023] Figure 5 It is a schematic diagram of the initial state of the baffle and the second filter screen of the present invention.

[0024] In the figure: 1-aeration tank, 1001-chute, 1002-storage chamber, 1003-transfer chamber, 1004-connecting port, 2-pressing screen, 3-collecting barrel, 4-air pipe, 5-diffuser, 6-solenoid valve, 101-electric slider, 102-connecting rod, 103-fixing rod, 10301-rotating part, 104-stirring plate, 105-first filter screen, 106-float, 201-slip ring, 202-blocking plate, 203-second filter screen, 204-fixing plate, 205-electric gate. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0026] Example 1

[0027] like Figure 1-Figure 3 As shown, a multifunctional aeration device for sewage treatment includes an aeration tank 1, an air pipe 4, a diffuser 5 and a solenoid valve 6; a storage chamber 1002 is provided in the aeration tank 1; a plurality of air pipes 4 are provided at the bottom of the aeration tank 1; each air pipe 4 is connected to an external air pump device; a plurality of diffusers 5 are installed on each air pipe 4; a solenoid valve 6 is connected to the bottom of the aeration tank 1;

[0028] It also includes a lifting component, a pressure net 2, a collecting bucket 3, a stirring component and a salvaging system; a lifting component is provided on the aeration tank 1; a pressure net 2 is installed on the lifting component; the pressure net 2 is driven up and down by the lifting component; a plurality of collecting buckets 3 are provided on the pressure net 2; a water level sensor is provided in each collecting bucket 3; a stirring component is installed on each collecting bucket 3; a salvaging system is provided on the aeration tank 1.

[0029] The lifting assembly includes an electric slider 101 and a connecting rod 102; a plurality of slide grooves 1001 are provided on the aeration tank 1; a plurality of electric sliders 101 are slidably connected to the aeration tank 1; each electric slider 101 slides on an adjacent slide groove 1001; a connecting rod 102 is fixedly connected to each electric slider 101; and a plurality of connecting rods 102 are fixedly connected to the pressing net 2.

[0030] The stirring assembly includes a fixed rod 103 and a stirring blade 104; a fixed rod 103 is fixedly connected to the lower side of each collecting barrel 3; a rotating part 10301 is arranged on the lower side of each fixed rod 103; a motor is arranged in each fixed rod 103, and the fixed rod 103 drives the rotating part 10301 to rotate through the built-in motor; a plurality of stirring blades 104 are fixedly connected to each rotating part 10301.

[0031] It also includes a first filter screen 105 and a float 106; each collecting barrel 3 is fixed with a first filter screen 105; each collecting barrel 3 is slidably connected to a float 106 at the lower side; the float 106 is made of a material with a density less than water.

[0032] Each stirring blade 104 is arranged in an inclined shape to facilitate churning of the sewage and increase the dissolved oxygen content in the sewage.

[0033] Each first filter screen 105 is configured to be conical in shape, so as to guide the scum to flow toward the side of the first filter screen 105, thereby preventing the scum from clogging the first filter screen 105 and ensuring normal drainage of sewage.

[0034] Each buoy 106 is configured to be in the shape of an inverted truncated cone, so as to guide the floating scum to move to the side of the buoy 106 , thereby preventing the floating scum from being pressed into the water by the buoy 106 and being difficult to fish out.

[0035] The surface of each collecting barrel 3 and buoy 106 is coated with an anti-corrosion coating to extend the service life of the collecting barrel 3 and buoy 106 .

[0036] After the worker discharges the sewage into the storage chamber 1002 of the aeration tank 1 through the pipe, the worker starts the external pumping device to transport gas into the air pipe 4, and then the gas is ejected from the diffuser 5, so that the air generates bubbles in the sewage in the aeration tank 1, thereby providing sufficient dissolved oxygen in the sewage, which is beneficial to the sewage reaction purification. When the sewage is reacting and purifying, impurities will be precipitated in the sewage. At the same time, during the sewage aeration process, scum will be generated on the water surface and sludge will be precipitated in the water. When the gas is ejected from the diffuser 5 to provide sufficient dissolved oxygen in the sewage, the scum layer on the water surface will isolate the sewage from the air, limit the discharge of gas from the water and limit the area of ​​contact between the sewage and the outside air, reduce the oxygen transmission efficiency, thereby inhibiting the activity of aerobic microorganisms and reducing the decomposition of organic matter, resulting in The effect of sewage treatment is affected. At the same time, during the aeration process, the water surface will roll when air escapes from the water surface, which will cause the water surface to be in a surging state, causing the scum to rise and fall with the water surface. When the scum is sucked through the suction pipe, the scum will rise and fall, which makes it difficult for the suction pipe to adjust in real time following the surging of the liquid surface, resulting in difficulty in sucking the scum. In order to avoid this phenomenon, after a period of aeration, the electric slider 101 is started to slide downward on the slide 1001, thereby driving the connecting rod 102 to move downward, so that the connecting rod 102 drives the pressure net 2 and the collection bucket 3 to move downward, so that the collection bucket 3 is completely immersed in the sewage. It should be noted that the sewage liquid level is lower than the maximum height of the storage chamber 1002 before and after the collection bucket 3 is immersed in the sewage. In this process, since the interior of the collecting bucket 3 is initially in an empty state, when the collecting bucket 3 is immersed in sewage, the sewage in the storage chamber 1002 directly flows into the empty collecting bucket 3. At this time, the floating scum of the sewage flows into the collecting bucket 3 under the action of the water flow. When the water level sensor in the collecting bucket 3 detects that the liquid level is about to exceed the uppermost side of the collecting bucket 3, a signal is transmitted to the electric slider 101, so that the electric slider 101 moves upward back to the initial state, thereby driving the collecting bucket 3 back to the initial position, so as to salvage and collect the scum. By repeatedly immersing the collecting bucket 3 in sewage to salvage the scum, the scum can still be stably salvaged through the collecting bucket 3 when the sewage surface surges, thereby preventing the scum from accumulating on the sewage surface for a long time and affecting the exposure The air works, when the collecting barrel 3 rises and is completely separated from the sewage, the float 106 on the lower side of the collecting barrel 3 slides downward under the downward pressure of the sewage, so that the lower side of the collecting barrel 3 is connected with the outside, and the sewage is discharged back into the storage chamber 1002. When the collecting barrel 3 is immersed in the sewage to salvage the scum next time, it is prevented that the scum in the collecting barrel 3 will flow back into the storage chamber 1002, and the scum is intercepted by the first filter screen 105 in the collecting barrel 3. At the same time, because the density of the float 106 is less than that of water, the float 106 is closely attached to the collecting barrel 3 under the influence of buoyancy when immersed in the sewage to collect the scum. Finally, the supernatant on the surface of the treated sewage is sucked by the external suction device, and then the solenoid valve 6 is opened to discharge the sewage in the aeration tank 1.Then prepare for the treatment of the next batch of sewage.

[0037] In the process of salvaging the scum, the surging of the water surface will push the scum to accumulate into floating blocks floating on the liquid surface, and the larger floating blocks are easy to hang on the outer edge of the collecting bucket 3 when flowing to the collecting bucket 3, causing the scum to easily fall back into the sewage, that is, reducing the collection effect of the collecting bucket 3 on the attachment. In order to avoid this phenomenon, when the collecting bucket 3 descends, the pressing net 2 moves downward synchronously. It should be noted that the height of the pressing net 2 is lower than the upper side height of the collecting bucket 3. When the collecting bucket 3 is not completely immersed in the sewage, the pressing net 2 first contacts with the sewage liquid surface. Note that the floating block itself is formed by the accumulation of scum, which is composed of foam and partial flocculants, so the floating block is in a loose state. The mesh holes on the pressing net 2 are used to separate the floating blocks accumulated on the surface of the sewage. When the collecting bucket 3 is completely immersed in the sewage, the sewage flows into the inside of the collecting bucket 3, causing the floating blocks to disperse into scum and then flow into the collecting bucket 3, thereby improving the collection effect of the scum. In addition, the scum or floating blocks are collected by the pressing net 2 and the collecting bucket 3, which is different from the existing use of a suction pipe to suck the scum, and will not cause the problem of easy clogging.

[0038] When the collecting barrel 3 descends, the collecting barrel 3 simultaneously drives the float 106, the fixing rod 103 and the stirring blade 104 to move downward. When the lower side of the fixing rod 103 contacts the diffuser 5, the external motor is started to drive the rotating part 10301 to rotate, thereby driving the stirring blade 104 to rotate in the sewage, so that the sewage in the storage chamber 1002 can be aerated more evenly, thereby improving the aeration effect of the device on the sewage.

[0039] Example 2

[0040] On the basis of Example 1, Figure 4 and Figure 5 As shown, the salvage system includes a slip ring 201, a baffle 202, a second filter screen 203, a fixed plate 204 and an electric gate 205; a transfer chamber 1003 is arranged in the aeration tank 1; a plurality of connecting ports 1004 are opened in the aeration tank 1, and the transfer chamber 1003 is connected with the storage chamber 1002 through the plurality of connecting ports 1004; a slip ring 201 is slidably connected to the transfer chamber 1003; a fixed plate 204 is fixedly connected to each connecting rod 102; the lower side of each fixed plate 204 is fixedly connected to the slip ring 201; a baffle 202 is fixedly connected to the lower side of the slip ring 201; a second filter screen 203 is fixedly connected in the slip ring 201; the baffle 202 is made of a material with a density less than that of water; and an electric gate 205 is slidably connected in each connecting port 1004.

[0041] The cross section of the second filter screen 203 is inverted V-shaped, and the holes on the second filter screen 203 are configured as micro holes, so as to guide the scum to accumulate on the side of the second filter screen 203 and facilitate the holes to filter sewage, thereby preventing the scum from clogging the second filter screen 203.

[0042] The thickness of the bottom of the aeration tank 1 gradually decreases from the outside to the center, which facilitates the sludge to flow toward the solenoid valve 6 when the solenoid valve 6 is opened, thereby improving the cleaning effect of the device on the sludge.

[0043] After the sewage is aerated for a long time, the sludge accumulates at the bottom of the aeration tank 1 for a long time. At this time, the sludge will be compacted due to its own weight to form sludge compaction, which will reduce the effective volume of the aeration tank 1. The accumulated and compacted sludge is difficult to be discharged with the residual water, resulting in the need for workers to handle it after the sewage aeration is completed. While increasing labor costs, it also increases the difficulty for workers to handle the bottom sludge. In order to avoid this phenomenon, after the sewage treatment is completed, the electric gate 205 is controlled to open upwards as shown in FIG. Figure 4 As shown, the electric slider 101 is started to move downward, so that the connecting rod 102 drives the fixing plate 204, the slip ring 201 and the baffle 202 to move downward. Since the transfer chamber 1003 is connected with the storage chamber 1002 through the connecting port 1004, the sewage level in the transfer chamber 1003 is flush with the sewage in the storage chamber 1002. When the baffle 202 contacts the sewage surface, since the baffle 202 is made of a material with a density lower than that of water, all the baffles 202 are squeezed upward by the liquid surface to form a Figure 5 Switch to Figure 4 The sliding ring 201 moves downward in the manner shown, thereby pressing the sewage in the transfer chamber 1003 to flow to the storage chamber 1002 through the connecting port 1004, so that the sewage flowing into the transfer chamber 1003 is blown back to the sludge at the bottom of the storage chamber 1002, so that the sludge at the bottom of the storage chamber 1002 is floated under the influence of the water flow, thereby preventing the sludge from hardening. At the same time, the sewage in the transfer chamber 1003 is completely discharged into the storage chamber 1002 under the action of the baffle 202. When the upper side of the slip ring 201 is lower than the upper side of the connecting port 1004, the sewage in the storage chamber 1002 loses the squeezing and blocking of the baffle 202 and re-passes through the connecting port 1004. The water flows from the outlet 1004 to the transfer chamber 1003. During this process, the floating sludge is affected by the water flow and is carried to the transfer chamber 1003, so that the sludge settles on the baffle 202. Then, when the electric slider 101 drives the baffle 202 and other parts to reset, the baffle 202 and other parts salvage the sludge in the storage chamber 1002. When the electric slider 101 moves upward to the initial state, in order to prevent the baffle 202 from moving upward and pushing the sewage out of the transfer chamber 1003, when the baffle 202 moves upward, the baffle 202 is impacted downward by the sewage, so that the baffle 202 is impacted as Figure 5The transfer chamber 1003 is opened in the manner shown, so that the sewage is retained in the transfer chamber 1003 through the baffle 202 to prevent the sewage from being pushed out of the transfer chamber 1003. During the rising process of the baffle 202, in order to prevent the sludge from falling into the transfer chamber 1003, the second filter screen 203 is used to intercept the sludge, and the sewage is discharged normally through the second filter screen 203 to prevent the sludge from falling back into the transfer chamber 1003. It should be noted that: by controlling the electric slider 101 to slide slowly upward, the second filter screen 203 is driven to rise slowly to prevent the scum from being affected. The sludge in the storage chamber 1002 is backblown and collected multiple times through the above method. Finally, a small amount of loose sludge remaining in the storage chamber 1002 is taken out by discharging sewage after opening the solenoid valve 6. There is no need for workers to enter the bottom of the aeration tank 1 for cleaning, which reduces the difficulty of cleaning for workers. When the second filter screen 203 drives the sludge to move upward to the highest point, the workers can directly clean the sludge salvaged from the second filter screen 203.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A multifunctional aeration device for sewage treatment, comprising an aeration tank (1), an air pipe (4), a diffuser (5) and a solenoid valve (6); a storage chamber (1002) is provided in the aeration tank (1); a plurality of air pipes (4) are provided at the bottom of the aeration tank (1); each air pipe (4) is connected to an external air pump device; a plurality of diffusers (5) are installed on each air pipe (4); a solenoid valve (6) is connected at the bottom of the aeration tank (1); the characteristics are: It also includes a lifting component, a pressure net (2), a collection bucket (3), a stirring component and a salvaging system; the aeration tank (1) is provided with a lifting component; a pressure net (2) for collecting scum is installed on the lifting component; the pressure net (2) is driven to move up and down by the lifting component; a plurality of collection buckets (3) are provided on the pressure net (2) to prevent scum from affecting sewage treatment; each collection bucket (3) is provided with a water level sensor; each collection bucket (3) is provided with a stirring component for improving sewage aeration effect; the aeration tank (1) is provided with a salvaging system for cleaning sludge; the salvaging system includes a slip ring (201), a baffle (202), a second filter screen (203), a fixing plate (204) and an electric gate (205); the aeration tank (1) is provided with a transfer chamber (1003); a plurality of communication ports (1004) are provided in the aeration tank (1), and the transfer chamber (1003) is connected with the storage chamber (1002) through the plurality of communication ports (1004); a slip ring (201) is slidably connected to the transfer chamber (1003); a lifting assembly is connected to a plurality of fixed plates (204); the lower side of each fixed plate (204) is fixedly connected to the slip ring (201); a baffle (202) is fixedly connected to the lower side of the slip ring (201); a second filter screen (203) for preventing sewage from overflowing is fixedly connected to the slip ring (201); the baffle (202) is made of a material with a density less than that of water; and an electric gate (205) is slidably connected to each communication port (1004).

2. A multifunctional aeration device for sewage treatment according to claim 1, characterized in that: The stirring assembly comprises a fixed rod (103) and stirring blades (104); a fixed rod (103) is fixedly connected to the lower side of each collecting barrel (3); a rotating part (10301) is provided on the lower side of each fixed rod (103); a motor is provided in each fixed rod (103), and the fixed rod (103) drives the rotating part (10301) to rotate through the built-in motor; and each rotating part (10301) is fixedly connected to a plurality of stirring blades (104) for improving the sewage aeration effect.

3. A multifunctional aeration device for sewage treatment according to claim 2, characterized in that: It also includes a first filter screen (105) and a float (106); each collection barrel (3) is fixedly connected to a first filter screen (105); the lower side of each collection barrel (3) is slidably connected to a float (106) for preventing sewage from driving floating scum back into the aeration tank (1); the float (106) is made of a material with a density less than that of water.

4. A multifunctional aeration device for sewage treatment according to claim 2, characterized in that: Each stirring blade (104) is arranged in an inclined shape.

5. A multifunctional aeration device for sewage treatment according to claim 3, characterized in that: Each first filter screen (105) is configured to be conical.

6. A multifunctional aeration device for sewage treatment according to claim 3, characterized in that: Each buoy (106) is configured to be in the shape of an inverted truncated cone.

7. A multifunctional aeration device for sewage treatment according to claim 3, characterized in that: The surface of each collecting bucket (3) and the buoy (106) is coated with an anti-corrosion coating.

8. A multifunctional aeration device for sewage treatment according to claim 1, characterized in that: The cross section of the second filter screen (203) is in an inverted V shape, and the holes on the second filter screen (203) are configured as micro holes.

9. A multifunctional aeration device for sewage treatment according to claim 1, characterized in that: The thickness of the bottom of the aeration tank (1) gradually decreases from the outside to the center.

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