A sewage treatment system

Abstract

The patent application belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment system, which is sequentially provided with a first sedimentation tank, an aeration tank and a second sedimentation tank along a sewage conveying direction, the first sedimentation tank is used for separating suspended solids and scum in sewage, the aeration tank is used for degrading organic pollutants and forming activated sludge, and the second sedimentation tank is used for separating activated sludge, and the sewage treatment system further comprises an intercepting mechanism, a backflow mechanism and a control module; the control module comprises a first monitoring unit, a second monitoring unit and a controller, the first monitoring unit is arranged to monitor the weight of solid waste in the intercepting assembly, the second monitoring unit is arranged to monitor the sewage inflow of the second sedimentation tank, the amount of activated sludge contained in the same volume of wastewater entering the second sedimentation tank is roughly the same, the activated sludge after precipitation in the second sedimentation tank can be roughly judged, and therefore the intercepting assembly can be cleaned in time and the activated sludge can be conveyed, so that the operation of the sewage treatment system is ensured.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically to a wastewater treatment system. Background Technology

[0002] The production of printed circuit boards generates a large amount of industrial wastewater, characterized by its large volume, diverse sources, complex composition, and varied properties. If this wastewater is not effectively treated, it will cause great harm to the environment.

[0003] In the wastewater treatment process, the wastewater is generally first intercepted by a screen and transported to the first sedimentation tank. Through gravity settling, larger suspended solids and scum in the wastewater are removed. Then, it is treated in an aeration tank, where aeration devices are used to oxygenate and promote the growth of aerobic microorganisms. These microorganisms decompose organic pollutants in the water. Finally, the activated sludge (composed of microbial communities) is separated from the treated water in the second sedimentation tank.

[0004] The above processing flow has the following problems: First, during the bar screen interception step, solid waste will accumulate on the bar screen, which may cause blockage if it is not cleaned in time; Second, since there is no aeration device in the second sedimentation tank, oxygen cannot be actively replenished in the second sedimentation tank. When too much activated sludge accumulates in the second sedimentation tank, it will affect the activity of microorganisms in the activated sludge. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the purpose of this invention is to provide a wastewater treatment system that can clean the screen and return the activated sludge in a timely manner.

[0006] The technical solution adopted in this invention is as follows:

[0007] A wastewater treatment system includes a first sedimentation tank, an aeration tank, and a second sedimentation tank arranged sequentially along the wastewater transport direction. The first sedimentation tank is used to separate suspended solids and scum from the wastewater. The aeration tank is used to degrade organic pollutants and form activated sludge. The second sedimentation tank is used to separate activated sludge. The system also includes an interception mechanism, a return mechanism, and a control module. The interception mechanism intercepts solid waste entering the wastewater in the first sedimentation tank. The control module includes a first monitoring unit, a second monitoring unit, and a controller. The first monitoring unit monitors the total weight of solid waste in the interception mechanism. When a preset value is reached, the controller controls the interception mechanism to open and discharge the solid waste. The second monitoring unit monitors the flow rate of wastewater flowing from the aeration tank into the second sedimentation tank. When a preset value is reached, the controller controls the return mechanism to transport the activated sludge from the second sedimentation tank to the aeration tank.

[0008] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0009] By setting up a first monitoring unit to monitor the weight of solid waste in the interception component and a second monitoring unit to monitor the amount of wastewater entering the second sedimentation tank, the amount of activated sludge in the same volume of wastewater entering the second sedimentation tank is roughly the same. The total amount of activated sludge after sedimentation in the second sedimentation tank can be roughly judged based on the amount of wastewater entering, so as to clean the interception component and transport the activated sludge in a timely manner, thus ensuring the operation of the wastewater treatment system.

[0010] In a preferred embodiment of the present invention, a third monitoring unit is also included, which is used to monitor degradation data in the aeration tank. The degradation data includes dissolved oxygen content and concentration values ​​of ammonia nitrogen and nitrate nitrogen. The controller controls the aeration rate in the aeration tank based on the degradation data.

[0011] Beneficial effects: By monitoring dissolved oxygen content, it ensures that microorganisms have sufficient oxygen for metabolism and degradation of organic matter; by monitoring changes in ammonia nitrogen and nitrate nitrogen concentrations, it assesses the effectiveness of nitrification and denitrification processes, which are important indicators for measuring biological nitrogen removal efficiency and can serve as a basis for judging microbial activity.

[0012] In a preferred embodiment of the present invention, a wireless communication module is also included, which transmits the monitoring data of the first monitoring unit and the second monitoring unit to a mobile phone terminal or a computer terminal.

[0013] Beneficial effects: By remotely monitoring data in the sewage treatment system, timely manual intervention is possible when anomalies occur.

[0014] In a preferred embodiment of the present invention, the first monitoring unit uses a pressure sensor, the second monitoring unit uses a pipeline flow meter, and the third monitoring unit uses a dissolved oxygen meter and a nitrogen detector.

[0015] In a preferred embodiment of the present invention, the interception mechanism includes a frame, a rotating plate, and a drive assembly. A filter plate is provided on the side of the frame facing the first sedimentation tank. A rotating shaft is fixedly connected to the side of the rotating plate near the filter plate. Both ends of the rotating shaft are rotatably connected to the frame. The upper end face of the rotating plate abuts against the lower end face of the frame and the filter plate. The drive assembly controls the rotating plate to rotate around the rotating shaft, so that the rotating plate and the side wall of the frame form an opening for discharging solid waste.

[0016] Beneficial effects: Wastewater is discharged through the inlet pipe, and the water flow rushes towards and passes through the filter plate. Solid waste is intercepted on the inside of the filter plate and slides down to the top of the rotating plate, thus achieving the interception of solid waste. By setting a rotating plate, and restricting the rotation direction of the rotating plate by the filter plate and the frame, the rotating plate can only rotate downward to form an opening. The rotating plate is in an inclined state, and solid waste slides out from the opening. The water flow formed by the wastewater can wash the filter plate, making it less likely for the solid waste intercepted on the filter plate to adhere to the filter plate.

[0017] In a preferred embodiment of the present invention, the filter plate includes a first filter plate and a second filter plate arranged sequentially from the outside to the inside, wherein the filter holes of the first filter plate are smaller than the filter holes of the second filter plate.

[0018] The filter plate also includes an upper limit plate, a baffle plate and a lower limit plate. The lower limit plate is fixedly connected to one side of the bottom surface of the second filter plate. The upper limit plate is vertically slidably installed on the lower limit plate. The baffle plate is fixedly connected to the upper limit plate. The rotating plate supports the baffle plate. When the rotating plate is open, it includes a first state and a second state. The opening for discharging solid waste is located on the side of the second filter plate away from the first filter plate.

[0019] When the rotating plate is in the first state, the upper limit plate slides down to contact the lower limit plate, and the blocking plate contacts the rotating plate.

[0020] When the rotating plate is in the second state, the blocking plate is disengaged from the rotating plate.

[0021] Beneficial effects: 1. By setting up a first filter plate and a second filter plate with different filter hole sizes, the intercepted solid waste can be classified by volume; 2. When the rotating plate is in the first state, smaller volume solid waste is isolated between the first and second filter plates, while larger volume solid waste is discharged; when the rotating plate is in the second state, the upper limit plate is blocked by the lower limit plate, and the blocking plate cannot descend with the rotating plate, creating a gap between the rotating plate and the blocking plate. At this time, smaller volume solid waste can be discharged; by discharging solid waste in stages, solid waste can be pre-screened, facilitating subsequent processing.

[0022] In a preferred embodiment of the present invention, a sliding hole is vertically provided on the lower limit plate, and a sliding block is fixedly connected to the lower end face of the upper limit plate, the sliding block being slidably installed in the sliding hole.

[0023] Beneficial effect: By placing the sliding hole and sliding block between the partition plate and the second filter plate, it is difficult for solid waste to enter the sliding hole.

[0024] In a preferred embodiment of the present invention, a limiting frame is installed on the first sedimentation tank, the frame is fixedly installed on the limiting frame, and a first partition, a second partition and a third partition are spaced apart on the limiting frame. When the rotating plate is in the first state, the opening is located between the first partition and the second partition, and the opening is located between the second partition and the third partition.

[0025] Beneficial effects: A first channel is formed between the first and second partitions, which can discharge large-volume solid waste; a second channel is formed between the second and third partitions, which can discharge smaller-volume solid waste.

[0026] In a preferred embodiment of the present invention, the driving assembly includes an obliquely arranged hydraulic cylinder, the housing of which is hinged to a limiting frame, and the piston rod of which is hinged to a rotating plate. When the hydraulic cylinder retracts, the side of the rotating plate away from the rotating shaft rotates downward.

[0027] Beneficial effect: The hydraulic cylinder with hinged connection can control the opening of the rotating plate, so that the opening is aligned with different channels. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the first embodiment of the industrial wastewater treatment equipment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the industrial wastewater treatment equipment of the present invention, embodiment one;

[0030] Figure 3 This is a partial structural schematic diagram of the industrial wastewater treatment equipment of the present invention when no solid waste is installed;

[0031] Figure 4 This is a cross-sectional view of the industrial wastewater treatment equipment of the present invention when no solid waste is installed;

[0032] Figure 5 This is the invention Figure 4 Enlarged view of the structure at point A;

[0033] Figure 6 This is a partial structural diagram of the industrial wastewater treatment equipment of the present invention during the cleaning of garbage in Embodiment 1;

[0034] Figure 7 This is a cross-sectional view of the industrial wastewater treatment equipment of the present invention in its first state in Embodiment 1;

[0035] Figure 8 This is the invention Figure 7 Enlarged view of the structure at point B;

[0036] Figure 9This is a cross-sectional view of the industrial wastewater treatment equipment of the present invention in its second state in Embodiment 1;

[0037] Figure 10 This is a cross-sectional view of the industrial wastewater treatment equipment of the present invention in Embodiment 2 when no solid waste is installed.

[0038] The reference numerals in the attached drawings include: frame 11, compression spring 12, first filter plate 13, second filter plate 14, positioning plate 15, upper limit plate 16, blocking plate 17, lower limit plate 18, sliding block 19, electromagnet 21, photoelectric switch 22, rotating plate 31, first sedimentation tank 4, limiting frame 41, first partition 42, second partition 43, third partition 44, and hose 45. Detailed Implementation

[0039] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0040] In the description of this application, the terms "first", "second", etc. are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Example

[0041] This embodiment discloses a wastewater treatment system, which includes a first sedimentation tank, an aeration tank, and a second sedimentation tank arranged sequentially along the wastewater transport direction. The first sedimentation tank is used to separate suspended solids and scum from the wastewater. The aeration tank is used to degrade organic pollutants and form activated sludge. The second sedimentation tank is used to separate activated sludge. The system also includes an interception mechanism, a return mechanism, and a control module. The interception mechanism intercepts solid waste in the wastewater entering the first sedimentation tank.

[0042] The system includes an interception mechanism, a return mechanism, and a control module. The interception mechanism intercepts solid waste from the wastewater entering the first sedimentation tank. The control module includes a wireless communication module, a first monitoring unit, a second monitoring unit, a third monitoring unit, and a controller. The first monitoring unit monitors the total weight of solid waste within the interception mechanism; once a preset value is reached, the controller controls the interception mechanism to open and discharge the solid waste. The second monitoring unit monitors the flow rate of wastewater flowing from the aeration tank into the second sedimentation tank; once a preset value is reached, the controller controls the return mechanism to transport the activated sludge from the second sedimentation tank to the aeration tank. The third monitoring unit monitors degradation data in the aeration tank, including dissolved oxygen content and the concentrations of ammonia nitrogen and nitrate nitrogen. The controller controls the aeration rate in the aeration tank based on the degradation data. The wireless communication module transmits the monitoring data from the first and second monitoring units to a mobile phone or computer terminal.

[0043] In this embodiment, the controller is controlled by a microcontroller, and the wireless communication module communicates via Bluetooth or WIFI; the first monitoring unit uses a pressure sensor, the second monitoring unit uses a pipeline flow meter, and the third monitoring unit uses a dissolved oxygen meter and a nitrogen analyzer. The nitrogen analyzer can simultaneously or separately measure ammonia nitrogen, nitrite nitrogen, and nitrate nitrogen in a water sample. These parameters can be used to evaluate water quality and wastewater treatment effectiveness; the reflux mechanism uses a sludge lift pump.

[0044] Among them, see Figure 2 As shown, a limiting frame 41 is installed on the first sedimentation tank 4, and the limiting frame 41 has a vertical sliding groove on the side near the first sedimentation tank 4; wherein, see reference Figure 9 As shown, the limiting frame 41 is provided with a first partition 42, a second partition 43 and a third partition 44 spaced apart. When the rotating plate 31 is in the first state, the opening is between the first partition 42 and the second partition 43, and between the second partition 43 and the third partition 44. A first channel is formed between the first partition 42 and the second partition 43, which can discharge solid waste with a larger volume. A second channel is formed between the second partition 43 and the third partition 44, which can discharge solid waste with a smaller volume.

[0045] Among them, see Figure 6 The water inlet pipe is a flexible hose 45. The upper part of the frame 11 is provided with a connection hole, and the flexible hose 45 is fixedly connected in the connection hole. The flexible hose 45 can move with the frame 11 within a certain range, so that the opening of the flexible hose 45 always faces the filter plate to adapt to the floating interception component 1.

[0046] In this embodiment, the water inlet pipe is controlled by a valve, and the valve is closed when the rotating plate 31 is opened.

[0047] Among them, see Figure 3 and Figure 4 As shown, the interception mechanism includes a frame 11. A filter plate is provided on the side of the frame 11 facing the first sedimentation tank 4. A compression spring 12 is vertically arranged between the frame 11 and the limiting frame 41. A positioning plate 15 is fixedly connected to the bottom surface of the frame 11. The positioning plate 15 contacts the outer wall of the first sedimentation tank 4 and is slidably connected to the sliding groove. By setting the positioning plate 15, the sliding direction of the frame 11 can be limited to avoid the spring bending, which would cause the frame 11 to deviate in the direction of movement. When the bottom of the frame 11 is higher than the top surface of the first sedimentation tank 4, the positioning plate 15 contacts the outer wall of the first sedimentation tank 4 and still plays a guiding role. It also seals the gap between the bottom of the frame 11 and the first sedimentation tank 4 to prevent sewage from flowing to the outside of the first sedimentation tank 4.

[0048] Among them, see Figure 4 As shown, the filter plate includes a first filter plate 13 and a second filter plate 14 arranged sequentially from the outside to the inside. The filter holes of the first filter plate 13 are smaller than those of the second filter plate 14. By setting the first filter plate 13 and the second filter plate 14 with different filter hole sizes, the intercepted solid waste can be classified by volume.

[0049] Among them, see Figure 4 As shown, the interception mechanism also includes a rotating plate 31 and a drive assembly. The rotating plate 31 is equipped with a rotating shaft, with the two ends of the rotating shaft rotatably mounted on the frame 11. A torsion spring is provided between the rotating shaft and the frame 11. The drive assembly controls the rotation of the rotating plate 31. The height of one side of the rotating plate 31 remains unchanged, while the other side deflects downward, so that the rotating plate 31 and the side wall of the frame 11 form an opening for discharging solid waste. Wastewater is discharged through the inlet pipe, and the water flow rushes towards and passes through the filter plate. Solid waste is intercepted inside the filter plate and slides down to the top of the rotating plate 31, thus achieving the interception of solid waste. By setting a rotatable rotating plate 31, an opening is formed after rotation. The rotating plate 31 is in an inclined state, and solid waste slides out from the opening.

[0050] In this embodiment, the rotating plate 31 is provided with an adsorption layer and an isolation layer from bottom to top. The adsorption layer is made of iron plate and the isolation layer is made of carbon fiber plate to prevent the metal objects above from being adsorbed and unable to detach from the rotating plate 31.

[0051] Among them, see Figure 4As shown, the driving assembly includes an electromagnet 21 and a photoelectric switch 22. When the positioning plate 15 moves to the lowest point, the photoelectric switch 22 sends an electrical signal to control the electromagnet 21 to be energized. The electromagnet 21 is located below the rotating plate 31 and on the side of the rotating shaft away from the first sedimentation tank 4. When the electromagnet 21 is energized, it drives the rotating plate 31 to rotate around the rotating shaft. By setting a compression spring 12, the height of the frame 11 changes according to the weight of the solid waste inside the frame 11. The positioning plate 15 serves to trigger the photoelectric switch 22. After blocking the photoelectric switch 22, the photoelectric switch 22 can be triggered.

[0052] In this embodiment, the photoelectric switch 22 is model E3JK-DS30M1.

[0053] Among them, see Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 9 As shown, the filter plate also includes an upper limit plate 16, a baffle plate 17, and a lower limit plate 18. The lower limit plate 18 is fixedly connected to one side of the bottom surface of the second filter plate 14. The upper limit plate 16 is vertically slidably installed on the second filter plate 14. The baffle plate 17 is fixedly connected to the upper limit plate 16. The rotating plate 31 supports the baffle plate 17. When the rotating plate 31 is open, it includes a first state and a second state. The opening for discharging solid waste is located on the side of the second filter plate 14 away from the first filter plate 13.

[0054] When the rotating plate 31 is in the first state, the upper limit plate 16 slides down to contact the lower limit plate 18, and the blocking plate 17 contacts the rotating plate 31.

[0055] When the rotating plate 31 is in the second state, the blocking plate 17 is disengaged from the rotating plate 31.

[0056] When the rotating plate 31 is in the first state, smaller volume solid waste is isolated between the first filter plate 13 and the second filter plate 14, while larger volume solid waste is discharged. When the rotating plate 31 is in the second state, the upper limit plate 16 is blocked by the lower limit plate 18, and the blocking plate 17 cannot follow the rotating plate 31 down. There is a gap between the rotating plate 31 and the blocking plate 17. At this time, smaller volume solid waste can be discharged. By discharging solid waste in stages, solid waste can be pre-screened, which facilitates subsequent processing.

[0057] The lower limiting plate 18 has a vertically formed sliding hole, and a sliding block 19 is fixedly connected to the lower end face of the upper limiting plate. The sliding block 19 is slidably installed in the sliding hole.

[0058] The usage method and principle of this embodiment are as follows:

[0059] Wastewater is discharged through hose 45 and flows through the second filter plate 14 and the first filter plate 13 in sequence into the first sedimentation tank 4.

[0060] Smaller solid waste is intercepted between the first filter plate 13 and the second filter plate 14, while larger solid waste is intercepted inside the second filter plate 14. The solid waste slides onto the rotating plate 31 due to gravity.

[0061] Solid waste continuously accumulates on the rotating plate 31, increasing the overall gravity and compressing the compression spring 12. The frame 11, positioning plate 15, and rotating plate 31 descend synchronously.

[0062] When the positioning plate 15 descends to its lowest point, it blocks the photoelectric switch 22. The photoelectric switch 22 sends an electrical signal, and the controller energizes the electromagnet 21. The rotating plate 31 then rotates around its axis to the first state. Figure 6 As shown, the rotating plate 31 forms an opening at the bottom of the frame 11, the lower limit plate 18 slides down to contact the upper limit plate 16, the blocking plate 17 contacts the rotating plate 31, and the smaller volume of solid waste is isolated between the first filter plate 13 and the second filter plate 14, while the larger volume of solid waste is discharged into the first channel.

[0063] The controller controls the electromagnet 21 to increase the magnetic force, and the rotating plate 31 is in the second state, such as... Figure 8 As shown, the upper limit plate 16 is blocked by the lower limit plate 18, and the blocking plate 17 cannot follow the rotating plate 31 to descend. There is a gap between the rotating plate 31 and the blocking plate 17. At this time, the smaller volume can be discharged into the second channel. By discharging solid waste in steps, solid waste can be pre-screened.

[0064] Due to the elastic force of the torsion spring, the rotating plate 31 is reset, and due to the elastic force of the compression spring 12, the frame 11 is reset, thus completing the self-cleaning of the interception mechanism. Example

[0065] Based on Example 1, the industrial wastewater treatment equipment in this example is described in reference to... Figure 10 The drive assembly uses a pressure sensor to replace the positioning plate 15, compression spring 12 and photoelectric switch 22. The frame 11 is fixedly installed on the limit frame 41. The pressure sensor monitors the total weight of solid waste inside the frame 11. The control assembly also includes a hydraulic rod. One end of the hydraulic rod is hinged to the limit frame 41 and the other end is hinged to the rotating plate 31. The rotation of the rotating plate 31 is controlled by the extension and retraction of the hydraulic rod, which can replace the electromagnet.

[0066] In this embodiment, after the solid waste in the frame 11 reaches the preset value of the pressure sensor, the telescopic hydraulic rod retracts a certain distance, so that the rotating plate 31 is in the first state. After a certain period of time, the telescopic hydraulic rod retracts again, so that the rotating plate 31 is in the second state.

[0067] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A wastewater treatment system comprising, sequentially along the wastewater transport direction, a first sedimentation tank, an aeration tank, and a second sedimentation tank, wherein the first sedimentation tank is used to separate suspended solids and scum from the wastewater, the aeration tank is used to degrade organic pollutants and form activated sludge, and the second sedimentation tank is used to separate the activated sludge, characterized in that: It also includes an interception mechanism, a return mechanism, and a control module. The interception mechanism intercepts solid waste in the wastewater entering the first sedimentation tank. The control module includes a first monitoring unit, a second monitoring unit, and a controller. The first monitoring unit monitors the total weight of solid waste in the interception mechanism. When a preset value is reached, the controller controls the interception mechanism to open and discharge the solid waste. The second monitoring unit monitors the flow rate of wastewater flowing from the aeration tank into the second sedimentation tank. When a preset value is reached, the controller controls the return mechanism to transport the activated sludge in the second sedimentation tank to the aeration tank. The interception mechanism includes a frame, a rotating plate, and a drive assembly. The frame has a filter plate on the side facing the first sedimentation tank. A rotating shaft is fixedly connected to the side of the rotating plate near the filter plate. The two ends of the rotating shaft are rotatably connected to the frame. The upper end face of the rotating plate abuts against the lower end face of the frame and the filter plate. The drive assembly controls the rotating plate to rotate around the rotating shaft, so that the rotating plate and the side wall of the frame form an opening for discharging solid waste. The filter plate includes a first filter plate and a second filter plate arranged at intervals from the outside to the inside, wherein the filter holes of the first filter plate are smaller than the filter holes of the second filter plate; The filter plate also includes an upper limit plate, a baffle plate and a lower limit plate. The lower limit plate is fixedly connected to one side of the bottom surface of the second filter plate. The upper limit plate is vertically slidably installed on the lower limit plate. The baffle plate is fixedly connected to the upper limit plate. The rotating plate supports the baffle plate. When the rotating plate is open, it includes a first state and a second state. The opening for discharging solid waste is located on the side of the second filter plate away from the first filter plate. When the rotating plate is in the first state, the upper limit plate slides down to contact the lower limit plate, and the blocking plate contacts the rotating plate. When the rotating plate is in the second state, the blocking plate is disengaged from the rotating plate.

2. The wastewater treatment system according to claim 1, characterized in that: It also includes a third monitoring unit, which is used to monitor degradation data in the aeration tank. The degradation data includes dissolved oxygen content, as well as the concentration values ​​of ammonia nitrogen and nitrate nitrogen. The controller controls the aeration rate in the aeration tank based on the degradation data.

3. The wastewater treatment system according to claim 2, characterized in that: It also includes a wireless communication module, which transmits the monitoring data of the first monitoring unit and the second monitoring unit to a mobile phone terminal or a computer terminal.

4. The wastewater treatment system according to claim 2, characterized in that: The first monitoring unit uses a pressure sensor, the second monitoring unit uses a pipeline flow meter, and the third monitoring unit uses a dissolved oxygen meter and a nitrogen detector.

5. The wastewater treatment system according to claim 1, characterized in that: The lower limit plate has a vertically opening sliding hole, and the lower end face of the upper limit plate is fixedly connected to a sliding block, which is slidably installed in the sliding hole.

6. The wastewater treatment system according to claim 1, characterized in that: A limiting frame is installed on the first sedimentation tank, and the frame is fixedly installed on the limiting frame. The limiting frame is provided with a first partition, a second partition, and a third partition at intervals. When the rotating plate is in the first state, the opening is between the first partition and the second partition, and the opening is between the second partition and the third partition.

7. The wastewater treatment system according to claim 6, characterized in that: The drive assembly includes an obliquely arranged hydraulic cylinder, the housing of which is hinged to a limit frame, and the piston rod of which is hinged to a rotating plate. When the hydraulic cylinder retracts, the side of the rotating plate away from the axis of rotation rotates downward.

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