Chemical agent adding equipment for sewage treatment

Abstract

The utility model relates to the technical field of sewage treatment, in particular to chemical agent adding equipment for sewage treatment, which comprises a base, a feeding component, a mixing component, a sewage treatment tank, a sewage treatment tank, a feeding component, a mixing component, a stirring component, a stirring component, a stirring component and a stirring component, wherein the sewage treatment tank is fixed at the top of the base; the feeding component is arranged at the top of the sewage treatment tank and is assembled to receive a chemical agent and provide a storage space for the chemical agent; the mixing assembly is arranged on the inner side of the feeding assembly and assembled to mix chemical agents, and the sealing assembly is arranged at the bottom of the mixing assembly and assembled to seal a mixing tank. According to the automatic cleaning device, the chemical agents can be recycled and the filter plate can be cleaned while automatic cleaning is achieved, manpower consumption is reduced, and the sewage treatment efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, and specifically relates to a chemical agent adding device for sewage treatment. Background Art

[0002] The chemical agent adding device is an important part of sewage treatment work. Its function is to accurately add the required chemical agents to the sewage to promote the purification treatment of the sewage. Generally speaking, the ratio range of common chemical agents to the sewage volume is roughly like that of flocculants, disinfectants and acid-base regulators, and the addition amount depends on the treatment requirements of the sewage.

[0003] Chinese Patent with the publication number CN218307514U discloses an automatic chemical agent adding device for sewage treatment. It mainly sets a screening net to prevent the undissolved chemical agents from being discharged through the conduit, improving the utilization rate of the chemical agents. It sets a cleaning brush plate to clean the screening net to prevent the screening net from being blocked after long-term use and avoid affecting the filtering effect of the screening net. It sets a liquid pump to export the liquid in the mixing tank through the conduit and then spray it into the sewage treatment tank through a spray head. At the same time, it solves the problem that when the device mixes chemical agents, it does not have the function of screening the undissolved chemical agents, resulting in the undissolved chemical agents being directly introduced into the sewage treatment equipment, affecting the use effect of the chemical agents and reducing the utilization rate of the chemical agents.

[0004] In the prior art, the problem that the device does not have the function of screening the undissolved chemical agents when mixing chemical agents has been solved. However, the screened chemical agents need to be separated manually, and since the brush is easy to adhere to the chemical agents, it causes difficulty in separation and is not convenient for cleaning the filter plate, reducing the cleanliness.

[0005] Therefore, the utility model provides a chemical agent adding device for sewage treatment that can quickly clean the filter plate and conveniently separate and recycle chemical agents. Summary of the Utility Model

[0006] A chemical agent adding device for sewage treatment designed to solve the problems of inconvenient rapid cleaning of the filter plate and difficult separation and recycling of chemical agents in the prior art.

[0007] The technical solution adopted by the present utility model to solve its technical problems is as follows: A chemical agent adding device for sewage treatment, including a base, on the top of the base is fixedly installed a sewage treatment tank, characterized in that: it further includes a feeding assembly, arranged on the top of the sewage treatment tank, which is assembled to access chemical agents and provide a storage space for chemical agents, and it includes four legs, the four legs are fixed on the top of the sewage treatment tank, and on the top of the four legs is fixedly installed a mixing tank; a mixing assembly, arranged inside the feeding assembly, which is assembled to mix chemical agents, and it includes a stepping motor, the stepping motor is fixed on the top of the mixing tank, at the bottom of the output end of the stepping motor is fixedly installed a stirring rod, inside the stirring rod is welded a limiting rod, outside the limiting rod is sleeved a scraping plate, at the bottom of the scraping plate is fixedly installed a spring, and the other end of the spring is fixed on the top of the bottom wall of the stirring rod; a sealing assembly, arranged at the bottom of the mixing assembly, which is assembled to seal the mixing tank, and it includes three telescopic rods, the three telescopic rods are fixed on the top of the bottom wall of the mixing tank, and at the output ends of the three telescopic rods is fixed on the top of a filter plate.

[0008] Specifically, on the outer side of the top of the sewage treatment tank is welded a sewage pipe, and the sewage pipe is communicated with the inside of the sewage treatment tank, on the outer side of the bottom of the sewage treatment tank is welded a water outlet pipe, and the water outlet pipe is communicated with the inside of the sewage treatment tank, on the top of the sewage treatment tank is fixedly installed a water pump, and the output end of the water pump is communicated with the inside of the sewage treatment tank.

[0009] Specifically, the feeding assembly further includes a discharge pipe fixed at the bottom of the mixing tank, and the other end of the discharge pipe is fixed on the outer side of the input end of the water pump.

[0010] Specifically, the feeding assembly further includes a water inlet pipe fixed on the top of the mixing tank, a flocculant pipe fixed on the top of the mixing tank, a disinfectant pipe fixed on the top of the mixing tank, and an acid-base regulator pipe fixed on the top of the mixing tank, and the water inlet pipe, the flocculant pipe, the disinfectant pipe and the acid-base regulator pipe are all communicated with the inside of the mixing tank.

[0011] Specifically, three side grooves are opened inside the mixing tank, pneumatic valves are fixed inside the three side grooves, a filter plate is sleeved outside the three pneumatic valves, three valve grooves are opened inside the mixing tank, and the other ends of the three pneumatic valves are respectively located inside the three valve grooves.

[0012] Specifically, the spring is located outside the limiting rod, and a through hole is penetrated and opened on one side of the scraping plate.

[0013] Specifically, the sealing assembly includes water holes, two water holes are penetrated and opened on the outer side of the mixing tank, two sealing plates are welded at the bottom of the two filter plates, a three-way pipe is welded on the outer side of the mixing tank, and the two interfaces of the three-way pipe are communicated with the two water holes, three sealing cloths are fixed inside the mixing tank, the tops of the three sealing cloths are respectively located outside the three telescopic rods, and the tops of the three sealing cloths are all fixed on the bottom of the filter plate, and the bottoms of the three sealing cloths are all fixed on the top of the bottom wall of the mixing tank.

[0014] Specifically, the scraping plate is divided into an inner scraping section, an outer scraping section and a connecting section. The inner scraping section is used to scrape and pile up the unfused chemical agent on the top of the filter plate during mixing. The outer scraping section is used to remove the unfused chemical agent piled up on the top of the filter plate from the top of the filter plate when cleaning the filter plate. The connecting section is used to limit the movement trajectories of the inner scraping section and the outer scraping section in the vertical direction.

[0015] Advantages of the present utility model:

[0016] (1) For the chemical agent adding device for sewage treatment of the present utility model, a scraping plate and a sealing component are adopted. Water is injected into the inner side of the mixing tank. Three pneumatic valves are controlled to release the restriction on the filter plate, and three telescopic rods are controlled to contract to release the sealing of the water holes. The motor drives water through the stirring rod to clean the inner wall of the mixing tank. At the same time, the stirring rod drives the scraping plate to remove the unfused chemical agent piled up on the top of the filter plate from the top of the filter plate, and then it is taken away from the filter surface under the impact of water, and then flows out from the two water holes under the drive of the water flow, and is collected and discharged into the recovery tank for recovery through the guidance of the three-way pipe. Compared with the prior art in which the filter plate is connected in a placement manner, it can be automatically cleaned and at the same time, the recovery of the chemical agent and the cleaning of the filter plate are realized, which not only reduces the labor consumption, but also improves the efficiency of sewage treatment.

[0017] (2) On the basis of beneficial effect (1), while the telescopic rod drives the filter plate to move, the spring at the bottom of the scraping plate drives the scraping plate to move along the outside of the limiting rod, restricting the scraping plate on the top of the scraping plate. The filter plate drives the two sealing plates to move towards the side close to the bottom of the mixing tank, thus ensuring that the scraping plate always cleans the surface of the filter plate. Compared with the fixed connection in the prior art, the functionality of the scraping plate is enhanced and the cleaning efficiency is improved. Description of the drawings

[0018] The present utility model will be further described below with reference to the drawings and embodiments.

[0019] Figure 1 is the overall three-dimensional structure schematic diagram of the present utility model;

[0020] Figure 2 is the overall cross-sectional schematic diagram of the present utility model;

[0021] Figure 3 is the three-dimensional structure schematic diagram of the mixing tank of the present utility model;

[0022] Figure 4 is the three-dimensional structure schematic diagram of the mixing component of the present utility model;

[0023] Figure 5 is the cross-sectional schematic diagram of the three-way pipe of the present utility model;

[0024] Figure 6Cross-sectional schematic diagram of the filter plate of the present utility model;

[0025] Figure 7 is Figure 4 enlarged view of part A;

[0026] Figure 8 Three-dimensional structural schematic diagram of the scraper of the present utility model.

[0027] In the figure: 1, base; 2, sewage treatment tank; 3, sewage pipe; 4, water outlet pipe; 5, water pump; 6, feeding assembly; 61, support leg; 62, discharge pipe; 63, mixing tank; 631, side groove; 632, pneumatic valve; 64, water inlet pipe; 65, flocculant pipe; 66, disinfectant pipe; 67, acid-base regulator pipe; 7, mixing assembly; 71, stepper motor; 72, stirring rod; 721, limiting rod; 73, scraper; 74, through hole; 75, filter plate; 751, sealing plate; 8, closing assembly; 81, telescopic rod; 82, sealing cloth; 83, valve groove; 84, three-way pipe; 85, water hole. Detailed implementation manners

[0028] In order to make the technical means, creative features, achieved purposes and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with the detailed implementation manners.

[0029] Embodiment:

[0030] As Figures 1-8 shown, a chemical agent adding device for sewage treatment according to the present utility model includes a base 1, a sewage treatment tank 2 is fixed on the top of the base 1, and a feeding assembly 6 is arranged on the top of the sewage treatment tank 2, which is assembled to access chemical agents and provide a storage space for chemical agents;

[0031] Furthermore, a sewage pipe 3 is welded on the outer side of the top of the sewage treatment tank 2, and the sewage pipe 3 is communicated with the inside of the sewage treatment tank 2. An outlet pipe 4 is welded on the outer side of the bottom of the sewage treatment tank 2, and the outlet pipe 4 is communicated with the inside of the sewage treatment tank 2. A water pump 5 is fixed on the top of the sewage treatment tank 2, and the output end of the water pump 5 is communicated with the inside of the sewage treatment tank 2.

[0032] In this embodiment, the outlet pipe 4 is used to discharge the treated sewage.

[0033] Furthermore, the feeding assembly 6 includes four support legs 61, the four support legs 61 are fixed on the top of the sewage treatment tank 2, a mixing tank 63 is fixed on the top of the four support legs 61, a discharge pipe 62 is fixed at the bottom of the mixing tank 63, and the other end of the discharge pipe 62 is fixed on the outer side of the input end of the water pump 5.

[0034] Further, the feeding assembly 6 further includes a water inlet pipe 64 fixed to the top of the mixing tank 63, a flocculant pipe 65 fixed to the top of the mixing tank 63, a disinfectant pipe 66 fixed to the top of the mixing tank 63, and an acid-base regulator pipe 67 fixed to the top of the mixing tank 63. The water inlet pipe 64, the flocculant pipe 65, the disinfectant pipe 66, and the acid-base regulator pipe 67 are all connected to the inside of the mixing tank 63.

[0035] In this embodiment, the staff connects the sewage source to the sewage pipe 3 through a sewage pump and a pipeline, and fixes the pipeline to the sewage pipe 3 with bolts. The water source is connected to the water inlet pipe 64 through a water pump and a pipeline, and the pipeline is fixed to the water inlet pipe 64 with bolts. The flocculant source is connected to the flocculant pipe 65 through a pipeline and a pump body, and the pipeline is fixed to the water inlet pipe 64 with bolts. The disinfectant source is connected to the disinfectant pipe 66 through a pipeline and a pump body, and the pipeline is fixed to the water inlet pipe 64 with bolts. The acid-base regulator source is connected to the acid-base regulator pipe 67 through a pipeline and a pump body, and the pipeline is fixed to the water inlet pipe 64 with bolts. The dosage of each additive is controlled by the corresponding connected pump body. Then, the staff first fills the sewage into the inside of the sewage treatment tank 2 through the sewage pipe 3. After reaching the specified working dosage, the injection of sewage is stopped. Then, according to the dosage of the sewage, the matching water, flocculant source, disinfectant, and acid-base regulator are respectively injected into the mixing tank 63 through the flocculant pipe 65, the disinfectant pipe 66, and the acid-base regulator pipe 67 according to actual needs to prepare for the subsequent work.

[0036] Further, three side grooves 631 are opened inside the mixing tank 63. Pneumatic valves 632 are fixed inside the three side grooves 631. A filter plate 75 is sleeved outside the three pneumatic valves 632. Three valve grooves 83 are opened inside the mixing tank 63. The other ends of the three pneumatic valves 632 are respectively located inside the three valve grooves 83.

[0037] In this embodiment, the three pneumatic valves 632 can support and limit the filter plate 75. After all the mixed chemical agents are pumped into the sewage treatment tank 2, the water pump 5 and the solenoid valve are closed. At the same time, the stepping motor 71 is controlled to reverse, and water is injected into the inside of the mixing tank 63 again. The three pneumatic valves 632 are controlled to move out of the three valve grooves 83 to release the restriction on the filter plate 75.

[0038] Further, a mixing assembly is arranged inside the feeding assembly 6 and is assembled to mix chemical agents. The mixing assembly 7 includes a stepping motor 71 fixed to the top of the mixing tank 63. A stirring rod 72 is fixed to the bottom of the output end of the stepping motor 71. A limiting rod 721 is welded inside the stirring rod. A scraping plate 73 is sleeved outside the limiting rod 721. A through hole 74 is opened through one side of the scraping plate 73. A spring is fixed to the bottom of the scraping plate 73, and the other end of the spring is fixed to the top of the bottom wall of the stirring rod 72, and the spring is located outside the limiting rod 721.

[0039] In this embodiment, when mixing the chemical agents, the stepping motor 71 is started to rotate forward, and the stirring rod 72 stirs and mixes the water and chemical additives inside the mixing tank 63. At the same time, the stirring rod 72 drives the scraping plate 73 to scrape and accumulate the undissolved chemical agents on the top of the filter plate 75, avoiding the situation that the well-mixed chemical agents cannot pass through the filter plate 75. After being evenly mixed, the electromagnetic valve and the water pump 5 at the bottom of the mixing tank 63 are opened. The water pump 5 pumps the well-mixed chemical agents out of the mixing tank 63 through the discharge pipe 62 and then pumps them into the sewage treatment tank 2 for reaction. When the electromagnetic valve and the water pump 5 at the bottom of the mixing tank 63 are opened, the staff controls the rotation of the motor at the top of the sewage treatment tank 2, which is convenient for the sewage and chemical agents to be mixed and accelerates the reaction rate.

[0040] Furthermore, the sealing assembly 8 is arranged at the bottom of the mixing assembly 7 and is assembled to seal the mixing tank 63. The sealing assembly 8 includes three telescopic rods 81. The three telescopic rods 81 are fixed to the top of the bottom wall of the mixing tank 63, and the output ends of the three telescopic rods 81 are fixed to the top of the filter plate 75. Two water holes 85 are penetrated and opened on the outside of the mixing tank 63. Two sealing plates 751 are welded to the bottom of the two filter plates 75. A three-way pipe 84 is welded to the outside of the mixing tank 63, and the two interfaces of the three-way pipe 84 are communicated with the two water holes 85. Three sealing cloths 82 are fixed to the inside of the mixing tank 63. The tops of the three sealing cloths 82 are respectively located outside the three telescopic rods 81, and the tops of the three sealing cloths 82 are all fixed to the bottom of the filter plate 75. The bottoms of the three sealing cloths 82 are all fixed to the top of the bottom wall of the mixing tank 63.

[0041] In this embodiment, the open end of the three-way pipe 84 is connected to the recovery tank through a pipeline. The three sealing cloths 82 can seal the three telescopic rods 81 and prevent the chemical agents from corroding the three telescopic rods 81.

[0042] After all the mixed chemicals are pumped into the sewage treatment tank 2, the water pump 5 and the solenoid valve are closed. At the same time, the stepping motor 71 is controlled to reverse, and water is injected into the inner side of the mixing tank 63 again. The three pneumatic valves 632 are controlled to move out from the inner sides of the three valve slots 83, lifting the restriction on the filter plate 75. The three telescopic rods 81 are controlled to contract, driving the filter plate 75 to move towards the bottom side of the mixing tank 63. At the same time, the spring at the bottom of the scraper 73 drives the scraper 73 to move along the outer side of the limiting rod 721 towards the bottom side of the mixing tank 63, restricting the scraper 73 on the top of the filter plate 75. The filter plate 75 drives the two sealing plates 751 towards the bottom side of the mixing tank 63, thereby lifting the closure of the water holes 85. The motor drives the water to clean the inner wall of the mixing tank 63 through the stirring rod 72. At the same time, the stirring rod 72 drives the scraper 73 to remove the undissolved chemicals accumulated on the top of the filter plate 75 from the top of the filter plate 75 and then be carried away from the filter surface under the impact of water. Then, it flows out from the two water holes 85 under the drive of the water flow, is collected through the guidance of the three-way pipe 84 and discharged into the recovery tank for recovery, thus realizing the recovery of the chemicals and the cleaning of the filter plate 75.

[0043] Working principle: In the initial state, refer to Figures 1-8 , before using this device, the staff connects the sewage source to the sewage pipe 3 through a sewage pump and a pipeline, and fixes the pipeline to the sewage pipe 3 with bolts. The water source is connected to the water inlet pipe 64 through a water pump and a pipeline, and the pipeline is fixed to the water inlet pipe 64 with bolts. The flocculant source is connected to the flocculant pipe 65 through a pipeline and a pump body, and the pipeline is fixed to the water inlet pipe 64 with bolts. The disinfectant source is connected to the disinfectant pipe 66 through a pipeline and a pump body, and the pipeline is fixed to the water inlet pipe 64 with bolts. The acid-base regulator source is connected to the acid-base regulator pipe 67 through a pipeline and a pump body, and the pipeline is fixed to the water inlet pipe 64 with bolts. The dosage of each additive is controlled by the corresponding connected pump body. Then, the staff first fills the sewage into the inner side of the sewage treatment tank 2 through the sewage pipe 3. After reaching the specified working dosage, the injection of sewage is stopped. Then, according to the dosage of the sewage, the matching water, flocculant source, disinfectant, and acid-base regulator are respectively injected into the mixing tank 63 through the flocculant pipe 65, disinfectant pipe 66, and acid-base regulator pipe 67 according to actual needs. Then, the stepping motor 71 is started to rotate forward, and the stirring rod 72 stirs and mixes the water and chemical additives inside the mixing tank 63. At the same time, the stirring rod 72 drives the scraper 73 to scrape and accumulate the undissolved chemicals on the top of the filter plate 75. After mixing evenly, the solenoid valve and the water pump 5 at the bottom of the mixing tank 63 are opened. The water pump 5 pumps the mixed chemicals out of the mixing tank 63 through the discharge pipe 62 and then pumps them into the sewage treatment tank 2 for reaction. When the solenoid valve and the water pump 5 at the bottom of the mixing tank 63 are opened, the staff controls the motor at the top of the sewage treatment tank 2 to rotate.

[0044] After all the mixed chemicals are pumped into the sewage treatment tank 2, the water pump 5 and the solenoid valve are closed. At the same time, the stepping motor 71 is controlled to reverse, and water is injected again into the inner side of the mixing tank 63. The three pneumatic valves 632 are controlled to move out from the inner sides of the three valve slots 83, the restriction on the filter plate 75 is released, the three telescopic rods 81 are controlled to contract to drive the filter plate 75 to move towards the side close to the bottom of the mixing tank 63. At the same time, the spring at the bottom of the scraper 73 drives the scraper 73 to move towards the side close to the bottom of the mixing tank 63, and the scraper 73 is restricted on the top of the filter plate 75. The filter plate 75 drives the two sealing plates 751 towards the side close to the bottom of the mixing tank 63, thereby releasing the sealing of the water holes 85. The motor drives water through the stirring rod 72 to clean the inner wall of the mixing tank 63. At the same time, the stirring rod 72 drives the scraper 73 to remove the undissolved chemicals accumulated on the top of the filter plate 75 from the top of the filter plate 75 and then be carried away from the filter surface under the impact of water, and then flow out from the two water holes 85 under the drive of the water flow, and are collected and discharged into the recovery tank for recovery through the guidance of the three-way pipe 84.

[0045] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of protection required by the present invention. The scope of protection required by the present invention is defined by the appended claims and their equivalents.

Claims

1. A chemical agent adding device for sewage treatment, comprising a base (1), and a sewage treatment tank (2) is fixedly arranged on the top of the base (1), and is characterized in that: It further includes a feeding component (6) arranged on the top of the sewage treatment tank (2), which is assembled to access chemical agents and provide a storage space for chemical agents. It includes four legs (61), the four legs (61) are fixed on the top of the sewage treatment tank (2), and a mixing tank (63) is fixed on the top of the four legs (61); a mixing component arranged inside the feeding component (6), which is assembled to mix chemical agents. It includes a stepping motor (71), the stepping motor (71) is fixed on the top of the mixing tank (63), a stirring rod (72) is fixed at the bottom of the output end of the stepping motor (71), a limiting rod (721) is welded inside the stirring rod, a scraping plate (73) is sleeved outside the limiting rod (721), and a spring is fixed at the bottom of the scraping plate (73), and the other end of the spring is fixed on the top of the bottom wall of the stirring rod (72); a closing component (8) arranged at the bottom of the mixing component (7), which is assembled to close the mixing tank (63). It includes three telescopic rods (81), the three telescopic rods (81) are fixed on the top of the bottom wall of the mixing tank (63), and the output ends of the three telescopic rods (81) are fixed on the top of the filter plate (75).

2. The chemical agent adding device for sewage treatment according to claim 1, wherein: A sewage pipe (3) is welded on the outer side of the top of the sewage treatment tank (2), and the sewage pipe (3) is communicated with the inside of the sewage treatment tank (2). An outlet pipe (4) is welded on the outer side of the bottom of the sewage treatment tank (2), and the outlet pipe (4) is communicated with the inside of the sewage treatment tank (2). A water pump (5) is fixed on the top of the sewage treatment tank (2), and the output end of the water pump (5) is communicated with the inside of the sewage treatment tank (2).

3. The chemical agent adding device for sewage treatment according to claim 2, characterized in that: The feeding component (6) further includes a discharge pipe (62) fixed at the bottom of the mixing tank (63), and the other end of the discharge pipe (62) is fixed on the outer side of the input end of the water pump (5).

4. The chemical agent adding device for sewage treatment according to claim 3, characterized in that: The feeding component (6) further includes a water inlet pipe (64) fixed on the top of the mixing tank (63), a flocculant pipe (65) fixed on the top of the mixing tank (63), a disinfectant pipe (66) fixed on the top of the mixing tank (63), and an acid-base regulator pipe (67) fixed on the top of the mixing tank (63), and the water inlet pipe (64), the flocculant pipe (65), the disinfectant pipe (66) and the acid-base regulator pipe (67) are all communicated with the inside of the mixing tank (63).

5. The chemical agent adding device for sewage treatment according to claim 3, wherein: Three side grooves (631) are formed inside the mixing tank (63), pneumatic valves (632) are fixed inside the three side grooves (631), a filter plate (75) is sleeved outside the three pneumatic valves (632), three valve grooves (83) are formed inside the mixing tank (63), and the other ends of the three pneumatic valves (632) are respectively located inside the three valve grooves (83).

6. The chemical agent adding device for sewage treatment according to claim 5, characterized in that: The spring is located outside the limiting rod (721), and a through hole (74) is formed through one side of the scraping plate (73).

7. The chemical agent adding device for sewage treatment according to claim 6, characterized in that: The closed component (8) includes water holes (85). Two water holes (85) are penetrated and formed on the outer side of the mixing tank (63). Two sealing plates (751) are welded to the bottoms of the two filter plates (75). A three-port pipe (84) is welded to the outer side of the mixing tank (63), and two interfaces of the three-port pipe (84) are communicated with the two water holes (85). Three sealing cloths (82) are fixed to the inner side of the mixing tank (63). The tops of the three sealing cloths (82) are respectively located outside the three telescopic rods (81), and the tops of the three sealing cloths (82) are all fixed to the bottom of the filter plate (75). The bottoms of the three sealing cloths (82) are all fixed to the top of the bottom wall of the mixing tank (63).

8. The chemical agent adding device for sewage treatment according to claim 6, wherein: The scraper (73) is divided into an inner scraping section, an outer scraping section and a connecting section. The inner scraping section is used to scrape and accumulate the undissolved chemical agent on the top of the filter plate (75) during mixing. The outer scraping section is used to remove the undissolved chemical agent accumulated on the top of the filter plate (75) from the top of the filter plate (75) when cleaning the filter plate (75). The connecting section is used to limit the movement trajectories of the inner scraping section and the outer scraping section in the vertical direction.

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