Flow pushing device and sewage treatment system

Abstract

The utility model provides a flow pushing device and a sewage treatment system, the flow pushing device comprises a main flow pipe and a branch flow part, an air flow channel is formed in the main flow pipe, the main flow pipe further comprises an air inlet, and the air inlet is used for communicating the air flow channel with external air making equipment; the number of the branch flow components is multiple, the branch flow components are arranged at intervals in the length direction of the main flow pipe, an exhaust channel is formed in each branch flow component, each exhaust channel is communicated with the airflow channel, each branch flow component is further provided with exhaust holes, and the exhaust holes are communicated with the exhaust channels in a one-to-one correspondence mode. According to the flow pushing device, an air injection mode is adopted, scum is pushed to move through air, and a chain structure is omitted, so that frequent maintenance is not needed, the maintenance cost is reduced, the risk of mechanical coil clamping does not occur in the use process, and the operation safety of operators is greatly protected.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment systems, and in particular to a flow-pushing device and a sewage treatment system. Background Art

[0002] In the water treatment process, dissolved air flotation devices are usually used to treat oil substances or fine suspended particles in sewage. The supporting flotation devices mainly include: dissolved air water pump, compressed air system, dissolved air tank, dissolved air releaser, flotation tank and scraper, etc. The flotation device introduces air into the water in the form of tiny bubbles, so that the tiny bubbles adhere to the particles suspended in the water to form a three-phase mixed system of water, air and particles. After the particles adhere to the bubbles, their density is less than that of water and they float to the water surface to form a scum layer, which is separated from the water. The treated water at the bottom is discharged into the next treatment process through the water distribution pipe at the bottom of the pool.

[0003] In the prior art, a scraper is used for scraping, which requires frequent maintenance of the scraper bearings and chains, resulting in high maintenance costs and the risk of mechanical entrapment.

[0004] Therefore, it is necessary to provide a new flow-pushing device and a sewage treatment system to solve the above-mentioned technical problems. Utility Model Content

[0005] The main purpose of the utility model is to provide a flow pushing device and a sewage treatment system, aiming to solve the technical problems in the prior art that the scraping machine has high maintenance costs and there is a risk of injury to operators.

[0006] According to one aspect of the utility model, the utility model provides a flow-pushing device, comprising:

[0007] A main flow pipe, wherein an air flow channel is formed inside the main flow pipe, and the main flow pipe further comprises an air inlet, wherein the air inlet is used to connect the air flow channel with an external gas production device;

[0008] A branch component, wherein the number of the branch components is multiple, and the multiple branch components are arranged at intervals along the length direction of the main pipe, and an exhaust channel is formed inside each of the branch components, and each of the exhaust channels is connected to the airflow channel. Each of the branch components also has an exhaust hole, and the exhaust hole is connected to the exhaust channel one by one.

[0009] In one embodiment, the branch component includes a first branch tube and a second branch tube, the first branch tube and the second branch tube are respectively arranged on both sides of the main tube, the exhaust channel includes a first sub-exhaust channel and a second sub-exhaust channel, the first sub-exhaust channel is arranged in the first branch tube, the second sub-exhaust channel is arranged in the second branch tube, the first sub-exhaust channel and the second sub-exhaust channel are both connected to the airflow channel, the exhaust hole includes a first sub-exhaust hole and a second sub-exhaust hole, the first sub-exhaust hole is arranged in the first branch tube and is connected to the first sub-exhaust channel; the second sub-exhaust hole is arranged in the second branch tube and is connected to the second sub-exhaust channel.

[0010] In one embodiment, there are multiple first sub-exhaust holes, which are spaced apart along the length direction of the first branch tube; there are multiple second sub-exhaust holes, which are spaced apart along the length direction of the second branch tube.

[0011] In one embodiment, the flow-pushing device further comprises a nozzle, wherein the nozzle comprises an air inlet end and an air outlet end which are connected to each other, wherein the air inlet end is connected to the air outlet hole, and the air outlet end is formed with a plurality of evenly distributed fine holes.

[0012] According to another aspect of the utility model, the utility model also provides a sewage treatment system, including a treatment tank, an air flotation device and the above-mentioned flow-pushing device, the treatment tank is formed with a accommodating chamber, the accommodating chamber is used to accommodate wastewater, the tank wall of the accommodating chamber is formed with a water inlet, a water outlet and a sewage outlet, the water inlet, the water outlet and the sewage outlet are all connected to the accommodating chamber, the air flotation device is used to discharge tiny bubbles into the accommodating chamber, the flow-pushing device is arranged in the accommodating chamber, and the flow-pushing device is located above the wastewater, and the flow-pushing device is used to discharge the scum on the top of the wastewater to the sewage outlet.

[0013] In one embodiment, the sewage treatment system further includes a valve and a connecting pipe, wherein the connecting pipe is installed at the water outlet, the connecting pipe forms a water flow channel, the water flow channel is connected to the accommodating cavity, the valve is arranged on the connecting pipe, and the connecting pipe is installed at the water outlet.

[0014] In one embodiment, the valve is an electric proportional valve.

[0015] In one embodiment, the sewage treatment system further comprises a control component, and the control component is respectively connected to the electric proportional valve and the flow-pushing device by signals.

[0016] In one embodiment, a plurality of water absorption holes arranged at intervals are formed on the connecting pipe, and the water absorption holes are used to connect the water flow channel and the accommodating cavity.

[0017] In one embodiment, the flow-pushing device further includes a liquid level sensor, which is disposed on the top of the groove wall of the accommodating cavity, and the liquid level sensor is connected to the control component signal.

[0018] In the above scheme, the flow pushing device includes a main pipe and a branch flow component, an air flow channel is formed inside the main pipe, and the main pipe also includes an air inlet, which is used to connect the air flow channel with an external gas production equipment; there are multiple branch flow components, and the multiple branch flow components are arranged at intervals along the length direction of the main pipe, and an exhaust channel is formed inside each branch flow component, each exhaust channel is connected to the air flow channel, and each branch flow component is also formed with an exhaust hole, and the exhaust hole is connected to the exhaust channel one by one. Specifically, wastewater is discharged from the production equipment into the containing chamber of the treatment tank, which also includes a sewage outlet interconnected with the containing chamber. Then the operator installs the flow-pushing device on the upper part of the containing chamber so that the exhaust hole is set toward the wastewater. Then the operator starts the external gas-making equipment to generate gas. The gas enters the air flow channel through the air inlet, moves in the air flow channel and is finally discharged from the exhaust hole. A flotation device is provided in the treatment tank. The flotation device will generate tiny bubbles in the wastewater, so that the tiny bubbles will adhere to the particles suspended in the wastewater to form a three-phase mixed system of water, gas and particles. After the particles adhere to the bubbles, the density will be less than that of water, and they will float on the wastewater to form a scum layer. The gas discharged from the exhaust hole will push the scum layer on the water surface toward the exhaust hole. The scum layer is moved in the direction of discharge of the sewage body, that is, it is pushed to move toward the sewage outlet, and finally the scum layer is discharged from the sewage outlet, thus completing the cleaning of the scum; while in the prior art, a chain is used to drive the scraper plate to move, so that the scraper plate pushes the scum to move toward the sewage outlet, and finally the scum is pushed out of the sewage outlet. Such a solution requires frequent maintenance of the bearings and chains, which will lead to increased maintenance costs, and there may be a risk of mechanical entrapment during maintenance and use, resulting in injuries to operators; while in the utility model, the scum is pushed to move by jetting, and the chain structure is omitted, so that frequent maintenance is not required, which reduces maintenance costs, and there is no risk of mechanical entrapment during use, which greatly protects the operating safety of operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0020] Figure 1This is a schematic diagram of the overall structure of a flow-pushing device according to an embodiment of the utility model;

[0021] Figure 2 for Figure 1 A magnified view at point A;

[0022] Figure 3 for Figure 1 Enlarged view at B;

[0023] Figure 4 It is a schematic diagram of the overall structure of a sewage treatment system according to an embodiment of the utility model.

[0024] Description of Figure Numbers:

[0025] Label name Label name 1 Mainstream pipe 11 Air Inlet 2 Branch parts 21 Exhaust Hole 211 First sub-exhaust hole 212 Second sub exhaust hole 22 The first branch pipe 23 The second branch pipe 3 Nozzle 31 Inlet side 32 Exhaust end 321 Pores 100 Flow device 200 Sewage treatment system 201 Processing tank 201a Accommodation cavity 201b Water Inlet 201c Water outlet 201d Sewage outlet 202 valve 203 Connecting pipe 203a Water absorption hole 4 Liquid level sensor

[0026] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0028] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0029] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0032] According to one aspect of the utility model, see Figures 1 to 4 The utility model provides a flow-pushing device 100, comprising:

[0033] A main flow pipe 1, wherein an air flow channel is formed inside the main flow pipe 1, and the main flow pipe 1 further comprises an air inlet 11, and the air inlet 11 is used to connect the air flow channel with an external gas production device;

[0034] There are multiple branch components 2, which are arranged at intervals along the length direction of the main pipe 1, and an exhaust channel is formed inside each branch component 2, each exhaust channel is connected to the air flow channel, and each branch component 2 is also formed with an exhaust hole 21, which is connected to the exhaust channel one by one. Specifically, wastewater is discharged from the production equipment into the accommodating chamber 201a of the treatment tank 201. The treatment tank 201 also includes a sewage outlet 201d interconnected with the accommodating chamber 201a. Then the operator installs the flow-pushing device 100 on the upper part of the accommodating chamber 201a so that the exhaust hole 21 is set toward the wastewater. Then the operator starts the external gas-making equipment to generate gas. The gas enters the air flow channel through the air inlet 11, and then flows from the air flow channel to the exhaust channel. Finally, the gas flows from the exhaust channel to the exhaust hole 21 and is discharged from the exhaust hole 21. The treatment tank 201 is provided with an air flotation device, which will generate tiny bubbles in the wastewater, so that the tiny bubbles will adhere to the particles suspended in the wastewater to form a three-phase mixed system of water, gas and particles. After the particles adhere to the bubbles, the density will be less than that of water, and they will float on the surface of the wastewater to form a scum layer. The exhaust hole 21 discharges The gas discharged will push the scum layer on the water surface to move in the direction of gas discharge in the exhaust hole 21, that is, push the scum layer to move toward the sewage outlet 201d, and finally discharge the scum layer from the sewage outlet 201d, thus completing the cleaning of the scum; while the prior art adopts a solution in which a chain is used to drive the scraper plate to move, so that the scraper plate pushes the scum to move toward the sewage outlet 201d, and finally pushes the scum out of the sewage outlet 201d. Such a solution requires frequent maintenance of bearings and chains, which will lead to increased maintenance costs, and there may be a risk of mechanical entrapment during maintenance and use, resulting in injuries to operators; while in the utility model, the scum is pushed to move by jetting, and the chain structure is omitted, so that frequent maintenance is not required, which reduces maintenance costs, and there is no risk of mechanical entrapment during use, which greatly protects the operating safety of operators.

[0035] See also Figures 1 to 3In one embodiment, the branch component 2 includes a first branch tube 22 and a second branch tube 23, the first branch tube 22 and the second branch tube are respectively arranged on both sides of the main tube 1, the exhaust channel includes a first sub-exhaust channel and a second sub-exhaust channel, the first sub-exhaust channel is arranged in the first branch tube 22, the second sub-exhaust channel is arranged in the second branch tube, the first sub-exhaust channel and the second sub-exhaust channel are both connected to the airflow channel, the exhaust hole 21 includes a first sub-exhaust hole 211 and a second sub-exhaust hole 212, the first sub-exhaust hole 211 is arranged in the first branch tube 22 and is connected to the first sub-exhaust channel; the second sub-exhaust hole 212 is arranged in the second branch tube and is connected to the second sub-exhaust channel. Specifically, wastewater is discharged from the production equipment into the accommodating chamber 201a of the treatment tank 201, and then the operator installs the flow-pushing device 100 on the upper part of the accommodating chamber 201a so that the exhaust hole 21 is set toward the wastewater. Then the operator starts the external gas-making equipment to generate gas, and the gas enters the airflow channel through the air inlet 11. Then the gas flows in the airflow channel and is divided into the first sub-exhaust channel and the second sub-exhaust channel. Finally, the gas in the first sub-exhaust channel flows from the first sub-exhaust channel to the first sub-exhaust hole 211 and is discharged from the first sub-exhaust hole 211; the gas in the second sub-exhaust channel flows from the second sub-exhaust channel to the second sub-exhaust hole 212 and is discharged from the second sub-exhaust hole 212. The gas discharged from the first sub-exhaust hole 211 and the second sub-exhaust hole 212 will push the scum layer on the water surface to move. Through such a setting, the effective area of ​​the gas can be increased, and the area of ​​one-time scum treatment can be increased, thereby improving the operating efficiency.

[0036] See also Figures 1 to 3 In one embodiment, there are multiple first sub-exhaust holes 211, which are spaced apart along the length direction of the first branch pipe 22; there are multiple second sub-exhaust holes 212, which are spaced apart along the length direction of the second branch pipe. By providing multiple first sub-exhaust holes 211 and multiple second sub-exhaust holes 212, the effective area of ​​the gas can be further increased, thereby further improving the working efficiency.

[0037] See also Figure 1 and Figure 3 In one embodiment, the flow-pushing device 100 further includes a nozzle 3, which includes an inlet end 31 and an exhaust end 32 that are connected to each other, the inlet end 31 is connected to the exhaust hole 21, and the exhaust end 32 is formed with a plurality of evenly distributed fine holes 321. By providing the nozzle 3, not only can the effective area of ​​the gas be increased, but also different types of nozzles 3 can be used according to different occasions, and nozzles 3 with different fine holes 321 can be selected according to the width of the processing tank 201, which can greatly improve the application range of the flow-pushing device 100.

[0038] Furthermore, the nozzle 3 is a flat nozzle 3, which can increase the pressure of the gas sprayed from the fine holes 321 to improve the effect of removing scum.

[0039] According to another aspect of the utility model, see Figures 1 to 4 The utility model also provides a sewage treatment system 200, including a treatment tank 201, an air flotation device and the above-mentioned flow-pushing device 100. The treatment tank 201 is formed with a accommodating chamber 201a, and the accommodating chamber 201a is used to accommodate wastewater. The tank wall of the accommodating chamber 201a is formed with a water inlet 201b, a water outlet 201c and a sewage outlet 201d. The water inlet 201b, the water outlet 201c and the sewage outlet 201d are all connected to the accommodating chamber 201a. The air flotation device is used to discharge tiny bubbles toward the accommodating chamber 201a. The flow-pushing device 100 is arranged in the accommodating chamber 201a, and the flow-pushing device 100 is located above the wastewater. The flow-pushing device 100 is used to discharge the scum on the top of the wastewater to the sewage outlet 201d. Specifically, wastewater is discharged from the production equipment into the accommodating chamber 201a of the treatment tank 201 through the water inlet 201b, and then the operator installs the flow-pushing device 100 on the upper part of the accommodating chamber 201a, so that the exhaust hole 21 is set toward the wastewater, and then the operator starts the external gas-making equipment to generate gas, and the gas enters the air flow channel through the air inlet 11, and then flows from the air flow channel to the exhaust channel, and finally the gas flows from the exhaust channel to the exhaust hole 21, and is discharged from the exhaust hole 21, pushing the scum to be discharged from the sewage outlet 201d hole, and the treated water below can be discharged from the water outlet 201c and flow to the next process. Since the sewage treatment system 200 includes all implementation methods of all embodiments of the above-mentioned flow-pushing device 100, it has at least all the beneficial effects brought by all the above-mentioned implementation methods, which will not be repeated here one by one.

[0040] See also Figures 1 to 4 In one embodiment, the sewage treatment system 200 further includes a valve 202 and a connecting pipe 203. The connecting pipe 203 is installed at the water outlet 201c. The connecting pipe 203 forms a water flow channel, which is communicated with the accommodating chamber 201a. The valve 202 is arranged on the connecting pipe 203, and the connecting pipe 203 is installed at the water outlet 201c. Specifically, when the scum is not discharged, the valve 202 is in a closed state, which can prevent the scum from entering the next process; when the scum is discharged, the operator manually turns the turntable of the valve 202 to open the valve 202, so that the treated water can be discharged from the connecting pipe 203 to the next process; such a setting can further reduce the content of scum in the treated water.

[0041] In one embodiment, the valve 202 is an electric proportional valve. By providing the electric proportional valve, the valve 202 can be opened or closed automatically, which can greatly reduce the labor intensity of the operators.

[0042] In one embodiment, the sewage treatment system 200 further includes a control component, which is respectively connected to the electric proportional valve and the flow-pushing device 100 by signal. Specifically, when the operator starts the air flotation device, the electric proportional valve is in a closed state, and the wastewater level in the accommodating chamber 201a rises. When the running time of the air flotation device is consistent with the preset running time set in the control component, the air flotation device stops, and the control component controls the flow-pushing device 100 to start, so that the gas discharged by the flow-pushing device 100 will discharge the scum on the upper layer of the wastewater from the sewage outlet 201d. When the running time of the flow-pushing device 100 is consistent with the preset running time set in the control component, the flow-pushing device 100 stops, the electric proportional valve opens, and the treated water below the accommodating chamber 201a is discharged from the water outlet 201c to the next process; through such a setting, the automatic treatment of sewage can be realized, which further greatly reduces the labor intensity of the operators and improves the operation efficiency.

[0043] See also Figure 4 In one embodiment, a plurality of water absorption holes 203a are formed on the connecting pipe 203, and the water absorption holes 203a are used to connect the water flow channel and the accommodating chamber 201a. By providing the water absorption holes 203a, when the treated water is discharged, the large particles of scum still existing in the treated water can be blocked outside the water absorption holes 203a, which can improve the purity of the treated water.

[0044] See also Figure 4 In one embodiment, the flow-pushing device 100 further includes a liquid level sensor 4, which is disposed at the top of the groove wall of the accommodating chamber 201a, and the liquid level sensor 4 is connected to the control component signal. Specifically, when the height of the liquid level reaches the liquid level sensor 4, the signal is transmitted to the control component, and the control component controls the opening of the electric proportional valve to discharge the treated water to the next process.

[0045] In one embodiment, the sewage treatment system 200 further includes a warning light, which is connected to the control component signal. When the device is running, the control component controls the warning light to start, and emits a bright light to warn the operator that the operation is in progress, which can further protect the safety of the operator.

[0046] The specific operation process of the above-mentioned sewage treatment system 200 is as follows: first, wastewater is injected into the accommodating chamber 201a of the treatment tank 201 within a certain period of time. It should be noted that the control component is connected to the signal of the device that discharges the wastewater, so that the time of injecting wastewater can be adjusted by the control component. Generally speaking, this time is 3600 seconds, and at this time, the control system will control the electric proportional valve to close to prevent the wastewater without slag removal from flowing into the next process; at the same time, the control component will also control the operation of the flotation device to float the waste slag in the wastewater. Furthermore, the flow-pushing device 100 also includes a compressed air solenoid valve, which is installed at the sewage outlet 201d. The compressed air solenoid valve is controlled by the control component to open and discharge the slag, and the discharge time is set. When the time is up, it will automatically close; then when the liquid level of the wastewater rises to the liquid level sensor 4, the liquid level sensor 4 will transmit the signal to the control component, and the control component controls the opening of the electric proportional valve to discharge the treated water to the next process, so that the slag cleaning is completed; then this is repeated back and forth.

[0047] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly used in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A flow-pushing device, characterized in that: include: A main flow pipe, wherein an air flow channel is formed inside the main flow pipe, and the main flow pipe further comprises an air inlet, wherein the air inlet is used to connect the air flow channel with an external gas production device; A branch component, wherein the number of the branch components is multiple, and the multiple branch components are arranged at intervals along the length direction of the main pipe, and an exhaust channel is formed inside each of the branch components, and each of the exhaust channels is connected to the airflow channel. Each of the branch components also has an exhaust hole, and the exhaust hole is connected to the exhaust channel one by one.

2. The flow-pushing device according to claim 1, characterized in that: The branch component includes a first branch tube and a second branch tube, and the first branch tube and the second branch tube are respectively arranged on both sides of the main tube, the exhaust channel includes a first sub-exhaust channel and a second sub-exhaust channel, the first sub-exhaust channel is arranged in the first branch tube, and the second sub-exhaust channel is arranged in the second branch tube, and the first sub-exhaust channel and the second sub-exhaust channel are both connected to the airflow channel, and the exhaust hole includes a first sub-exhaust hole and a second sub-exhaust hole, the first sub-exhaust hole is arranged in the first branch tube and is connected to the first sub-exhaust channel; the second sub-exhaust hole is arranged in the second branch tube and is connected to the second sub-exhaust channel.

3. The flow-pushing device according to claim 2, characterized in that: There are multiple first sub-exhaust holes, which are spaced apart along the length direction of the first branch pipe; there are multiple second sub-exhaust holes, which are spaced apart along the length direction of the second branch pipe.

4. The flow-pushing device according to claim 1, characterized in that: The flow pushing device further comprises a nozzle, wherein the nozzle comprises an air inlet end and an air outlet end which are connected to each other, the air inlet end is connected to the air outlet hole, and the air outlet end is formed with a plurality of evenly distributed fine holes.

5. A sewage treatment system, characterized in that: It comprises a treatment tank, an air flotation device and a flow-pushing device as described in any one of claims 1 to 4, wherein the treatment tank is formed with a accommodating chamber, the accommodating chamber is used to accommodate wastewater, the tank wall of the accommodating chamber is formed with a water inlet, a water outlet and a sewage outlet, the water inlet, the water outlet and the sewage outlet are all connected to the accommodating chamber, the air flotation device is used to discharge tiny bubbles toward the accommodating chamber, the flow-pushing device is arranged in the accommodating chamber, and the flow-pushing device is located above the wastewater, and the flow-pushing device is used to discharge the scum on the top of the wastewater to the sewage outlet.

6. The sewage treatment system according to claim 5, characterized in that: The flow-pushing device also includes a valve and a connecting pipe, wherein the connecting pipe is installed at the water outlet and has a water flow channel formed therein, wherein the water flow channel is communicated with the accommodating cavity, and the valve is arranged on the connecting pipe and the connecting pipe is installed at the water outlet.

7. The sewage treatment system according to claim 6, characterized in that: The valve is an electric proportional valve.

8. The sewage treatment system according to claim 7, characterized in that: The flow-pushing device further comprises a control component, and the control component is respectively connected to the electric proportional valve and the flow-pushing device by signals.

9. The sewage treatment system according to any one of claims 6 to 8, characterized in that: The connecting pipe is formed with a plurality of water absorption holes arranged at intervals, and the water absorption holes are used to connect the water flow channel and the accommodating cavity.

10. The sewage treatment system according to claim 8, characterized in that: The flow-pushing device further comprises a liquid level sensor, which is arranged on the top of the groove wall of the accommodating cavity and is connected to the control component by signal.

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