Sewage treatment system

Abstract

The invention 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 in the 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 treating the activated sludge. The second sedimentation tank is used for separating activated sludge and further comprises an interception 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 used for monitoring the weight of solid waste in the interception assembly, the second monitoring unit is used for monitoring the sewage inlet amount of the second sedimentation tank, and the amount of activated sludge contained in the same volume of wastewater entering the second sedimentation tank is roughly the same; activated sludge settled in the second settling pond can be roughly judged, so that the intercepting assembly is cleaned and the activated sludge is conveyed in time, and the operation of the sewage treatment system is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to a sewage treatment system. Background Art

[0002] A large amount of industrial wastewater is generated during the production of circuit boards. Its characteristics are large water volume, multiple sources of wastewater, complex composition and different properties. If these wastewaters are not effectively treated, they will cause great harm to the environment.

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

[0004] In the above treatment process, the following problems exist: 1. In the screen interception step, solid waste will accumulate on the screen. If it is not cleaned in time, it may cause blockage; 2. Due to the lack of aeration equipment in the second sedimentation tank, oxygen cannot be actively added to the second sedimentation tank. When the activated sludge in the second sedimentation tank accumulates too much, it will affect the microbial activity in the activated sludge. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a sewage treatment system capable of timely cleaning the grid and returning the activated sludge.

[0006] The technical solution adopted by the present invention is as follows: A sewage treatment system is provided with a first sedimentation tank, an aeration tank, and a second sedimentation tank in sequence along the sewage conveying direction, wherein the first sedimentation tank is used to separate suspended solids and scum in the sewage, the aeration tank is used to degrade organic pollutants and form activated sludge, and the second sedimentation tank is used to separate activated sludge. The system also includes an interception mechanism, a reflux mechanism, and a control module, wherein the interception mechanism intercepts solid waste in the sewage entering the first sedimentation tank; the control module includes a first monitoring unit, a second monitoring unit, and a controller, wherein the first monitoring unit controls and monitors the total weight of solid waste in the interception mechanism, and when the total weight reaches a preset value, the controller controls the interception mechanism to open and discharge the solid waste; the second monitoring unit monitors the sewage flow rate flowing from the aeration tank into the second sedimentation tank, and when the total weight reaches a preset value, the controller controls the reflux mechanism to convey the activated sludge in the second sedimentation tank to the aeration tank.

[0007] Compared with the prior art, the present invention has the following beneficial effects: By setting the first monitoring unit to monitor the weight of solid waste in the interception component and the second monitoring unit to monitor the amount of sewage entering 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 total amount of activated sludge after precipitation in the second sedimentation tank can be roughly judged based on the amount of sewage entering, so as to clean the interception component and transport the activated sludge in time, thereby ensuring the operation of the sewage treatment system.

[0008] As a preferred embodiment of the present invention, it also includes a third monitoring unit, which is used to monitor the degradation data in the aeration tank. The degradation data includes the dissolved oxygen content, and the concentration values ​​of ammonia nitrogen and nitrate nitrogen. The controller controls the aeration amount in the aeration tank according to the degradation data.

[0009] Beneficial effects: By monitoring the dissolved oxygen content, it is ensured that microorganisms have sufficient oxygen for metabolism and degradation of organic matter; through the changes in the concentrations of ammonia nitrogen and nitrate nitrogen, the effectiveness of the nitrification and denitrification processes is evaluated, which is an important indicator for measuring the effect of biological denitrification and can be used as a basis for judging the activity of microorganisms.

[0010] As a preferred embodiment of the present invention, 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.

[0011] Beneficial effects: By remotely monitoring the data in the sewage treatment system, timely manual intervention can be carried out when abnormalities occur.

[0012] As a preferred embodiment of the present invention, the first monitoring unit adopts a pressure sensor, the second monitoring unit adopts a pipeline flow meter, and the third monitoring unit adopts a dissolved oxygen meter and a nitrogen detector.

[0013] As a preferred embodiment of the present invention, the intercepting mechanism includes a frame, a rotating plate and a driving 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 close to the filter plate. Both ends of the rotating shaft are rotatably connected to the frame. The upper end surface of the rotating plate rests on the lower end surfaces of the frame and the filter plate. The driving 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.

[0014] Beneficial effects: sewage is discharged through the water inlet pipe, water flows toward and passes through the filter plate, solid waste is intercepted on the inner side of the filter plate, and slides to the top of the rotating plate, thereby achieving interception of solid waste. By setting a rotatable rotating plate, and the filter plate and the frame restrict the rotation direction of the rotating plate, the rotating plate can only be rotated downward to form an opening. The rotating plate is in an inclined state, and solid waste slides out of the opening; the water flow formed by the sewage can flush the filter plate, so that the solid waste intercepted on the filter plate is not easy to adhere to the filter plate.

[0015] As a preferred embodiment of the present invention, the filter plate comprises a first filter plate and a second filter plate which are sequentially arranged from the outside to the inside, and the filter holes of the first filter plate are smaller than the filter holes of the second filter plate; The filter plate further comprises an upper limit plate, a blocking plate and a lower limit plate, wherein 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 mounted on the lower limit plate, the blocking plate is fixedly connected to the upper limit plate, the rotating plate supports the blocking plate, and the rotating plate includes a first state and a second state when opened, and the opening for discharging solid waste is located on a 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 downward 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 separated from the rotating plate.

[0016] Beneficial effects: 1. By setting the first filter plate and the 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, the smaller volume of solid waste is isolated between the first filter plate and the second filter plate, and the larger volume of 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 follow the rotating plate to descend. There is a gap between the rotating plate and the blocking plate. At this time, the smaller volume can be discharged; by discharging the solid waste in steps, the solid waste can be pre-screened to facilitate subsequent processing.

[0017] As a preferred embodiment of the present invention, a sliding hole is vertically opened on the lower limit plate, and a sliding block is fixedly connected to the lower end surface of the upper limit plate, and the sliding block is slidably installed in the sliding hole.

[0018] Beneficial effect: The sliding hole and the sliding block are arranged between the partition plate and the second filter plate, so that solid waste is not easy to enter the sliding hole.

[0019] As 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, the limiting frame is provided with a first partition, a second partition and a third partition at intervals, and 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.

[0020] Beneficial effect: A first channel is formed between the first partition and the second partition, into which solid waste with a larger volume can be discharged; a second channel is formed between the second partition and the third partition, into which solid waste with a smaller volume can be discharged.

[0021] As a preferred embodiment of the present invention, the driving assembly includes an obliquely arranged hydraulic cylinder, the hydraulic cylinder housing is hinged on the limit frame, the piston rod of the hydraulic cylinder is hinged on the rotating plate, and when the hydraulic cylinder contracts, the rotating plate rotates downward on the side away from the rotating shaft.

[0022] Beneficial effect: Through the hinged hydraulic cylinder, the hydraulic cylinder can control the opening of the rotating plate so that the opening is aligned with different channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a principle block diagram of the first embodiment of the industrial wastewater treatment equipment of the present invention; Figure 2 It is a structural schematic diagram of the first embodiment of the industrial wastewater treatment equipment of the present invention; Figure 3 It is a partial structural schematic diagram of the industrial wastewater treatment equipment in Embodiment 1 of the present invention when no solid waste is installed; Figure 4 is a cross-sectional view of the first embodiment of the industrial wastewater treatment equipment of the present invention when no solid waste is installed; Figure 5 The present invention Figure 4 A magnified view of the structure at A; Figure 6 It is a partial structural schematic diagram of the garbage cleaning in the first embodiment of the industrial wastewater treatment equipment of the present invention; Figure 7 is a cross-sectional view of the industrial wastewater treatment equipment in the first state in the first embodiment of the present invention; Figure 8 The present invention Figure 7 A magnified view of the structure at B; Fig. 9 is a cross-sectional view of the industrial wastewater treatment equipment in the second state in the first embodiment of the present invention; Fig.10 It is a cross-sectional view of the second embodiment of the industrial wastewater treatment equipment of the present invention when no solid waste is installed.

[0024] The reference numerals 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, limit frame 41, first partition plate 42, second partition plate 43, third partition plate 44, hose 45. DETAILED DESCRIPTION

[0025] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various changes in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations therein are essentially used for illustration purposes rather than for limiting the present invention.

[0026] In the description of the present application, the terms "first", "second", etc. are only used to facilitate the description of the present application and simplify the description, and do not indicate or imply that the structure referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] Embodiment 1: The present embodiment discloses a sewage treatment system, in which a first sedimentation tank, an aeration tank, and a second sedimentation tank are sequentially arranged along the sewage conveying direction. The first sedimentation tank is used to separate suspended solids and scum in the sewage, the aeration tank is used to degrade organic pollutants and form activated sludge, and the second sedimentation tank is used to separate activated sludge. The system also includes an interception mechanism, a reflux mechanism, and a control module. The interception mechanism intercepts solid waste in the sewage entering the first sedimentation tank.

[0028] Among them, it also includes an interception mechanism, a reflux mechanism and a control module, the interception mechanism intercepts solid waste in the sewage 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 controls and monitors the total weight of solid waste in the interception mechanism, and after reaching a preset value, the controller controls the interception mechanism to open and discharge the solid waste; the second monitoring unit monitors the sewage flow rate flowing from the aeration tank into the second sedimentation tank, and after reaching a preset value, the controller controls the reflux mechanism to transport the activated sludge in the second sedimentation tank to the aeration tank; the third monitoring unit is used to monitor the degradation data in the aeration tank, and the degradation data includes the dissolved oxygen content, and the concentration values ​​of ammonia nitrogen and nitrate nitrogen. The controller controls the aeration amount in the aeration tank according to the degradation data; the wireless communication module transmits the monitoring data of the first monitoring unit and the second monitoring unit to a mobile phone terminal or a computer terminal.

[0029] In this embodiment, the controller is controlled by a single-chip microcomputer, and the wireless communication module communicates by Bluetooth or WIFI; the first monitoring unit adopts a pressure sensor, the second monitoring unit adopts a pipeline flow meter, and the third monitoring unit adopts a dissolved oxygen meter and a three-nitrogen detector. The three-nitrogen detector can simultaneously or separately measure ammonia nitrogen, nitrite nitrogen and nitrate nitrogen in the water sample. These parameters can be used to evaluate water quality and sewage treatment effects; the reflux mechanism adopts a sludge lifting pump.

[0030] Among them, see Figure 2 As shown, a limiting frame 41 is installed on the first sedimentation tank 4, and a sliding groove is vertically provided on one side of the limiting frame 41 close to the first sedimentation tank 4; Fig. 9 As shown, the limiting frame 41 is provided with a first partition 42, a second partition 43 and a third partition 44 at intervals. When the rotating plate 31 is in the first state, the opening is between the first partition 42 and the second partition 43, and the opening is 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, into which larger solid waste can be discharged, and a second channel is formed between the second partition 43 and the third partition 44, into which smaller solid waste can be discharged.

[0031] Among them, see Figure 6 The water inlet pipe adopts a hose 45, and a connecting hole is provided on the upper part of the frame 11, and the hose 45 is fixedly connected in the connecting hole; the hose 45 can move with the frame 11 within a certain range, so that the opening of the hose 45 is always facing the filter plate to adapt to the floating interception component 1.

[0032] In this embodiment, the water inlet pipe controls water inlet through a valve, and when the rotating plate 31 is opened, the valve is closed.

[0033] Among them, see Figure 3 and Figure 4 As shown, the intercepting 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 is in contact with the outer wall of the first sedimentation tank 4, and the positioning plate 15 is slidably connected to the sliding groove; by providing the positioning plate 15, the sliding direction of the frame 11 can be limited to avoid spring bending, which causes the moving direction of the frame 11 to be offset. When the bottom of the frame 11 is higher than the top surface of the first sedimentation tank 4, the positioning plate 15 is in contact with the outer wall of the first sedimentation tank 4, still plays a guiding role, and blocks the gap between the bottom of the frame 11 and the first sedimentation tank 4 to avoid sewage flowing to the outside of the first sedimentation tank 4.

[0034] Among them, see Figure 4As shown, the filter plate includes a first filter plate 13 and a second filter plate 14 which are arranged in sequence from the outside to the inside, and the filter holes of the first filter plate 13 are smaller than the filter holes 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.

[0035] Among them, see Figure 4 As shown, the interception mechanism also includes a rotating plate 31 and a driving assembly. The rotating plate 31 is provided with a rotating shaft. The rotating shafts at both ends are respectively rotatably mounted on the frame 11, and a torsion spring is provided between the rotating shaft and the frame 11. The driving assembly controls the rotating plate 31 to rotate. The height position of one side of the rotating plate 31 remains unchanged, and 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. Sewage is discharged through the water inlet pipe, and the water flows toward and passes through the filter plate. The solid waste is intercepted on the inner side of the filter plate and slides to the top of the rotating plate 31, thereby 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 the solid waste slides out of the opening.

[0036] 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 an iron plate, and the isolation layer is made of a carbon fiber plate to prevent metal objects above from being adsorbed and unable to separate from the rotating plate 31 .

[0037] Among them, see Figure 4 As 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 arranged below the rotating plate 31 and is located 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 arranging the compression spring 12, the height of the frame 11 changes according to the weight of the solid waste in the frame 11. The positioning plate 15 plays a role in triggering the photoelectric switch 22. After blocking the photoelectric switch 22, the photoelectric switch 22 can be triggered.

[0038] In this embodiment, the model of the photoelectric switch 22 is E3JK-DS30M1.

[0039] Among them, see Figure 4 , Figure 5 , Figure 7 , Figure 8 , Fig. 9As shown, the filter plate further includes an upper limit plate 16, a blocking 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 mounted on the second filter plate 14, the blocking plate 17 is fixedly connected to the upper limit plate 16, the rotating plate 31 supports the blocking plate 17, and the rotating plate 31 includes a first state and a second state when opened, and the opening for discharging solid waste is located on the side of the second filter plate 14 away from the first filter plate 13; When the rotating plate 31 is in the first state, the upper limit plate 16 slides downward to contact the lower limit plate 18, and the blocking plate 17 contacts the rotating plate 31; When the rotating plate 31 is in the second state, the blocking plate 17 is separated from the rotating plate 31 .

[0040] When the rotating plate 31 is in the first state, a smaller volume of solid waste is isolated between the first filter plate 13 and the second filter plate 14, and a larger volume of 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 to descend. There is a gap between the rotating plate 31 and the blocking plate 17. At this time, a smaller volume of solid waste can be discharged; by discharging the solid waste in steps, the solid waste can be pre-screened to facilitate subsequent processing.

[0041] The lower limit plate 18 is provided with a sliding hole vertically, and the lower end surface of the upper limit plate is fixedly connected with a sliding block, and the sliding block 19 is slidably installed in the sliding hole. The usage and principle of this embodiment are as follows: The sewage is discharged through the hose 45, and the sewage passes through the second filter plate 14 and the first filter plate 13 in sequence and flows into the first sedimentation tank 4; Solid waste with a smaller volume is intercepted between the first filter plate 13 and the second filter plate 14, and solid waste with a larger volume is intercepted inside the second filter plate 14. The solid waste slides onto the rotating plate 31 due to gravity. Solid waste is continuously accumulated on the rotating plate 31, the overall gravity increases, the compression spring 12 is compressed, and the frame 11, the positioning plate 15, and the rotating plate 31 are synchronously lowered; When the positioning plate 15 drops to the lowest point, the positioning plate 15 blocks the photoelectric switch 22, the photoelectric switch 22 sends an electrical signal, the controller controls the electromagnet 21 to be energized, and the rotating plate 31 rotates around the rotating shaft to the first state, such as Figure 6 As shown, the rotating plate 31 and the bottom of the frame 11 form an opening, the lower limit plate 18 slides downward to contact the upper limit plate 16, and 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, and the larger volume of solid waste is discharged into the first channel; 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 rotation plate 31 to fall. There is a gap between the rotation plate 31 and the blocking plate 17. At this time, a smaller volume can be discharged into the second channel; by discharging solid waste in steps, solid waste can be pre-screened; 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, thereby completing the self-cleaning of the interception mechanism.

[0042] Embodiment 2: Based on the first embodiment, the industrial wastewater treatment equipment of this embodiment, see Fig.10 The driving component adopts a pressure sensor to replace the positioning plate 15, the compression spring 12 and the photoelectric switch 22. The frame 11 is fixedly installed on the limit frame 41, and the total weight of the solid waste in the frame 11 is monitored by the pressure sensor; the control component also includes a hydraulic rod, one end of the hydraulic rod is hinged to the limit frame 41, and the other end of the hydraulic rod 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.

[0043] In this embodiment, after the solid waste in the frame 11 reaches the preset value of the pressure sensor, the telescopic hydraulic rod contracts a certain distance, so that the rotating plate 31 is in the first state. After a certain period of time, the telescopic hydraulic rod contracts again, so that the rotating plate 31 is in the second state.

[0044] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A sewage treatment system, wherein a first sedimentation tank, an aeration tank, and a second sedimentation tank are sequentially arranged along the sewage conveying direction, wherein the first sedimentation tank is used to separate suspended solids and scum in the sewage, the aeration tank is used to degrade organic pollutants and form activated sludge, and the second sedimentation tank is used to separate activated sludge, characterized in that: It also includes an interception mechanism, a reflux mechanism and a control module, wherein the interception mechanism intercepts solid waste in sewage entering the first sedimentation tank; the control module includes a first monitoring unit, a second monitoring unit and a controller, wherein the first monitoring unit controls and monitors the total weight of solid waste in the interception mechanism, and after reaching a preset value, the controller controls the interception mechanism to open and discharge the solid waste; the second monitoring unit monitors the sewage flow rate flowing from the aeration tank into the second sedimentation tank, and after reaching a preset value, the controller controls the reflux mechanism to transport the activated sludge in the second sedimentation tank to the aeration tank.

2. The sewage 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, and concentration values ​​of ammonia nitrogen and nitrate nitrogen. The controller controls the aeration amount in the aeration tank according to the degradation data.

3. The sewage 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 sewage treatment system according to claim 2, characterized in that: The first monitoring unit adopts a pressure sensor, the second monitoring unit adopts a pipeline flow meter, and the third monitoring unit adopts a dissolved oxygen meter and a three-nitrogen detector.

5. The sewage treatment system according to claim 1, characterized in that: The intercepting mechanism includes a frame, a rotating plate and a driving 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 close to the filter plate. Both ends of the rotating shaft are rotatably connected to the frame. The upper end surface of the rotating plate rests on the lower end surfaces of the frame and the filter plate. The driving 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.

6. The sewage treatment system according to claim 5, characterized in that: The filter plate comprises a first filter plate and a second filter plate which are sequentially arranged from outside to inside, and the filter holes of the first filter plate are smaller than the filter holes of the second filter plate; The filter plate further comprises an upper limit plate, a blocking plate and a lower limit plate, wherein 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 mounted on the lower limit plate, the blocking plate is fixedly connected to the upper limit plate, the rotating plate supports the blocking plate, and the rotating plate includes a first state and a second state when opened, and the opening for discharging solid waste is located on a 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 downward 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 separated from the rotating plate.

7. The sewage treatment system according to claim 6, characterized in that: A sliding hole is vertically provided on the lower limit plate, a sliding block is fixedly connected to the lower end surface of the upper limit plate, and the sliding block is slidably installed in the sliding hole.

8. The sewage treatment system according to claim 6, 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.

9. The sewage treatment system according to claim 8, characterized in that: The driving assembly comprises an obliquely arranged hydraulic cylinder, the hydraulic cylinder housing is hinged on the limit frame, the piston rod of the hydraulic cylinder is hinged on the rotating plate, and when the hydraulic cylinder contracts, the rotating plate rotates downward on the side away from the rotating shaft.

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