Phosphorus removal agent adding system for sewage treatment plant

Abstract

The utility model discloses a dephosphorizing agent adding system for a sewage treatment plant. The dephosphorizing agent adding system comprises a chemical storage tank, a pressurizing unit, a diluting unit and a distributing device, the chemical storage tank is used for storing a phosphorus removal agent stock solution, and an outlet of the chemical storage tank is connected with a chemical conveying pipe; the number of the pressurizing units is two, each pressurizing unit comprises a dosing pump, the inlet end of the dosing pump is connected with the medicine conveying pipe through a first pipeline, a filter and a first valve are arranged on the first pipeline, and the first valve is arranged at the front end of the filter; the outlet end of the dosing pump is connected with the inlet end of the dilution unit through a second pipeline, and a pulse damper, a pressure gauge, a back pressure valve and a second valve are sequentially arranged on the second pipeline in the flowing direction of the fluid; the dilution unit and the distribution device are both arranged beside the sedimentation tank, and the dilution unit is used for diluting a phosphorus removal agent stock solution; the distribution device is connected with the outlet end of the dilution unit. The system can effectively reduce the pipeline blockage, reduce the operation cost, uniformly distribute the phosphorus removal agent, and ensure that a good phosphorus removal effect is obtained under a small dosage.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewage treatment, relates to a dephosphorization agent, and particularly relates to a dephosphorization agent dosing system for a sewage treatment plant. Background Art

[0002] Phosphorus is one of the key factors causing eutrophication of water bodies. In recent years, as the problem of eutrophication has become increasingly prominent, reducing phosphorus emissions from urban sewage treatment has become a key link in controlling eutrophication of water bodies.

[0003] There are two main methods for phosphorus removal in sewage treatment plants: biological and chemical. Biological phosphorus removal involves the conversion of dissolved phosphorus into particulate polyphosphates through the action of microorganisms, which are then discharged through sludge. Chemical phosphorus removal involves adding a phosphorus removal agent to the sewage, causing the dissolved phosphorus in the water to react with the agent to form an insoluble phosphate precipitate. The phosphorus is then removed from the sewage through solid-liquid separation. Common phosphorus removal agents include polyferric chloride, ferrous sulfate, and polyaluminum chloride. Currently, most sewage treatment plants use chemical phosphorus removal.

[0004] Regarding the addition of phosphorus removal agents, in order to improve the reaction uniformity, many sewage treatment plants currently dilute the phosphorus removal agents and then add them to the sedimentation tank using a diaphragm pump. This has the following shortcomings:

[0005] 1. Because the phosphorus remover reacts with phosphorus and other substances in the water to form precipitates, which will be deposited in the pipes and cause pipe blockage. In order to ensure the addition of the phosphorus remover, the pipes need to be replaced frequently, which will undoubtedly increase operating costs.

[0006] 2. Since a general sewage treatment plant has multiple sedimentation tanks and the water inlet flow rate of each sedimentation tank is certain, a diaphragm pump is only used to add dephosphorus removal agent to one or two sedimentation tanks. This not only increases the equipment investment, but also cannot ensure that the amount of dephosphorus removal agent added to each sedimentation tank is equal, resulting in excessive addition of dephosphorus removal agent in some sedimentation tanks, causing waste of dephosphorus removal agent and increased operating costs; in some sedimentation tanks, the amount of dephosphorus removal agent added is too little and the dephosphorus removal effect cannot be achieved. Summary of the Invention

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a dephosphorization agent dosing system for a sewage treatment plant, which can effectively reduce pipe blockage and reduce operating costs, while evenly distributing the dephosphorization agent to ensure good dephosphorization effect with a smaller dosage.

[0008] The technical solution of the present utility model is achieved as follows:

[0009] A dephosphorization agent dosing system for a sewage treatment plant comprises a drug storage tank, a pressurizing unit, a dilution unit and a distribution device.

[0010] The medicine storage tank is used to store the dephosphorization agent raw liquid, and the outlet of the medicine storage tank is connected to a medicine delivery pipe.

[0011] There are two groups of pressurizing units, each group of pressurizing units includes a dosing pump, the inlet end of the dosing pump is connected to the drug delivery tube through a first pipeline, and a filter and a first valve are provided on the first pipeline, and the first valve is provided at the front end of the filter; the outlet end of the dosing pump is connected to the inlet end of the dilution unit through a second pipeline, and a pulse damper, a pressure gauge, a back pressure valve and a second valve are provided on the second pipeline in sequence along the fluid flow direction.

[0012] The dilution unit and distribution device are both arranged beside the sedimentation tank. The dilution unit is used to dilute the dephosphorus removal agent stock solution to obtain the dephosphorus removal agent diluted solution. The distribution device is connected to the outlet end of the dilution unit and is used to evenly distribute the dephosphorus removal agent diluted solution for addition into the sedimentation tank.

[0013] Furthermore, a reflux pipe is provided at the outlet of the dosing pump, the inlet of the reflux pipe is connected to the second pipeline, and the other end is connected to the first pipeline and is located at the front end of the first valve. A safety valve is provided on the reflux pipe.

[0014] Furthermore, the dilution unit includes a pipeline mixer, the inlet of the pipeline mixer is connected to a water inlet pipe for introducing water, the water inlet pipe is provided with a float flowmeter to measure the water inlet flow, the second pipeline is connected to the water inlet pipe and is located at the rear end of the float flowmeter, so as to facilitate the dephosphorus agent concentrate and water to enter the pipeline mixer together, and the outlet of the pipeline mixer is connected to the distribution device through a third pipeline.

[0015] Furthermore, the distribution device includes a support frame and a distribution box body arranged on the support frame. The top surface of the distribution box body is open, and a cover body is provided on the top surface of the distribution box body to close the top surface of the distribution box body.

[0016] A flow stabilizing plate and an overflow plate are provided in the distribution box body, and the flow stabilizing plate and the overflow plate are spaced apart and arranged in parallel to divide the distribution box body into a medicine inlet chamber, a flow stabilizing chamber and a distribution chamber; a medicine inlet is provided on one side wall of the distribution box body corresponding to the medicine inlet chamber, and the third pipeline is connected to the medicine inlet, so that the dephosphorus removal agent dilution liquid flows into the medicine inlet chamber, and a plurality of flow stabilizing holes are evenly distributed on the lower part of the flow stabilizing plate, so that the dephosphorus removal agent dilution liquid in the medicine inlet chamber can smoothly enter the flow stabilizing chamber, so that the liquid level in the flow stabilizing chamber is stable; a plurality of partitions are provided in the distribution chamber, and all the partitions are spaced apart and arranged in parallel and are aligned with the medicine inlet. The overflow plate is vertical, and the edges of the three sides of the partition are respectively connected to the overflow plate, the bottom and the inner wall of the distribution box to divide the distribution chamber into a plurality of distribution slots. The distribution slots correspond one-to-one to the sedimentation tank to be added. At the same time, a number of overflow V-shaped grooves are provided on the overflow plate, and the number of overflow V-shaped grooves corresponding to each distribution slot is equal, so that the dephosphorus removal agent in the steady flow chamber can enter the distribution slot through the overflow V-shaped grooves at equal flow rates. The bottom of the distribution box corresponding to the bottom of each distribution slot is provided with a drug outlet for connecting a drug outlet pipe to add the dephosphorus removal agent dilution liquid in the distribution slot into the sedimentation tank.

[0017] Furthermore, the side wall of the distribution box where the medicine inlet is located is parallel to the flow stabilizing plate.

[0018] Furthermore, the flow stabilizing plate is detachably arranged in the distribution box.

[0019] Furthermore, the inner wall of the distribution box corresponding to the two ends of the flow stabilizing plate is provided with a card slot corresponding to the flow stabilizing plate, and the two ends of the flow stabilizing plate are clamped in the corresponding card slot, thereby realizing the detachable installation of the flow stabilizing plate.

[0020] Furthermore, a waste liquid outlet is provided at the bottom of the distribution box corresponding to the medicine inlet cavity.

[0021] Furthermore, the bottom of the distribution box corresponding to each distribution trough is concave downward and has a certain taper, and the drug outlet is arranged at the bottom of the cone, so that the phosphorus removal agent dilution liquid in the distribution trough can enter the sedimentation tank through the drug outlet pipe.

[0022] Furthermore, the support frame includes four vertically arranged columns, which are respectively located at the four vertices of a rectangle. A rectangular frame composed of several horizontally arranged cross bars is provided on the top of the four columns. The distribution box is placed on the rectangular frame, and a connecting rod is horizontally provided between two adjacent columns. At the same time, a connecting plate is horizontally provided at the bottom of each column, which facilitates the connection of the connecting plate to the horizontal base surface through a fixing piece, thereby fixing the support frame on the horizontal base surface.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. Compared with the prior art in which the dephosphorus removal agent stock solution is diluted in the pump room and then transported to the sedimentation tank for addition, the utility model arranges the dilution unit and the distribution device next to the sedimentation tank. The dephosphorus removal agent stock solution in the pump room is transported to the sedimentation tank for dilution and then evenly distributed by the distribution device for addition. This can effectively reduce the sediment deposition in the delivery pipeline and reduce the blockage of the delivery pipeline, thereby extending the delivery pipeline replacement cycle and reducing operating costs.

[0025] 2. The distribution box of the present invention includes a medicine feed chamber, a flow stabilization chamber and a distribution chamber. The distribution chamber is divided into distribution slots corresponding to the sedimentation tanks to be added by partitions. After the dephosphorus remover enters the medicine feed chamber, the flow stabilization holes arranged at the lower part of the flow stabilization plate are relatively small, which can eliminate turbulence. After the dephosphorus remover in the medicine feed chamber enters the flow stabilization chamber, the liquid level in the flow stabilization chamber is stable. Then the dephosphorus remover in the flow stabilization chamber enters the distribution slot by overflow, so that the flow rate of the dephosphorus remover entering the distribution slot can be stable and equal, thereby ensuring that the dephosphorus remover is evenly distributed, which is beneficial to ensure that all sedimentation tanks obtain good dephosphorus removal effects at a smaller dosage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 - Schematic diagram of the dosing system of the present invention.

[0027] Figure 2 -Schematic diagram of the structure of the distribution device.

[0028] Figure 3 - Top view of the dispensing box of the dispensing device.

[0029] Figure 4-Figure 3 AA cross-section diagram.

[0030] Figure 5-Figure 3 BB cross-section diagram.

[0031] Among them: 100-drug storage tank; 110-agitator; 120a-first valve; 120b-second valve; 120c-third valve; 120d-fourth valve; 120e-fifth valve; 130-filter; 140-diaphragm pump; 150-pulsation damper; 160-pressure gauge; 170-safety valve; 180-back pressure valve; 190-mixer; 200-distribution device; 210-float flowmeter; 1-support frame; 11-column; 12-cross bar; 13-connecting rod; 14-connecting plate; 2-distribution box; 21-drug inlet; 22-flow stabilizing plate; 23-card slot; 24-overflow plate; 25-drug outlet; 26-partition; 27-waste liquid outlet; 3-cover. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below with reference to the accompanying drawings and specific implementation methods.

[0033] See also Figure 1 A phosphorus removal agent dosing system for a sewage treatment plant includes a drug storage tank 100, a pressurizing unit, a dilution unit and a distribution device.

[0034] The medicine storage tank 100 is used to store the dephosphorus agent stock solution. A stirrer is provided in the medicine storage tank 100 for stirring the dephosphorus agent stock solution. The outlet of the medicine storage tank 100 is connected to a medicine delivery tube, and a first valve 120a is provided on the medicine delivery tube.

[0035] There are two groups of pressurizing units (one for use and one for backup), each group of pressurizing units includes a dosing pump 140, the inlet end of the dosing pump 140 is connected to the drug delivery tube through a first pipeline, and a filter 130 and a second valve 120b are provided on the first pipeline, and the second valve 120b is provided at the front end of the filter 130; the outlet end of the dosing pump 140 is connected to the inlet end of the dilution unit through a second pipeline, and a pulse damper 150, a pressure gauge 160, a back pressure valve 180 and a fifth valve 120e are provided on the second pipeline in sequence along the fluid flow direction.

[0036] The dilution unit and the distribution device 200 are both arranged next to the sedimentation tank. The dilution unit is used to dilute the dephosphorus removal agent stock solution to obtain the dephosphorus removal agent diluted solution; the distribution device 200 is connected to the outlet end of the dilution unit and is used to evenly distribute the dephosphorus removal agent diluted solution for addition into the sedimentation tank.

[0037] like Figure 1 As shown, the pulsation dampener and pressure gauge are installed on the second pipeline via a branch line. To facilitate timely maintenance of the pulsation dampener and pressure gauge, a third valve 120c and a fourth valve 120d are also installed on the branch lines for the pulsation dampener and pressure gauge, respectively. In this embodiment, the first, second, third, fourth, and fifth valves are all ball valves.

[0038] Compared to the prior art method of diluting the dephosphorus removal agent stock solution in the pump room and then transporting it to the sedimentation tank for addition, the dilution unit and distribution device are located next to the sedimentation tank. The dephosphorus removal agent stock solution in the pump room is transported to the sedimentation tank for dilution and then evenly distributed by the distribution device for addition. This can effectively reduce sediment deposition in the delivery pipeline and reduce pipeline blockage, thereby extending the pipeline replacement cycle and reducing operating costs. The use of the distribution device to evenly distribute the dephosphorus removal agent dilution solution before adding it to the sedimentation tank can ensure the consistency of the dephosphorus removal dosage in each sedimentation tank, thereby ensuring that all sedimentation tanks can achieve good dephosphorus removal effects with a small dosage.

[0039] In specific implementation, the outlet end of the dosing pump 140 is further provided with a reflux pipe, the inlet end of the reflux pipe is connected to the second pipeline, and the other end is connected to the first pipeline and is located at the front end of the second valve 120b. A safety valve 170 is provided on the reflux pipe.

[0040] When the value of the pressure gauge exceeds the set threshold, the alarm device will be triggered and the control unit will automatically control the safety valve to open, so that part of the dephosphorization agent solution will flow back and release the pressure in the system to protect the system.

[0041] In specific implementation, the dilution unit includes a pipeline mixer 190, the inlet of the pipeline mixer 190 is connected to a water inlet pipe for introducing water, the water inlet pipe is provided with a float flowmeter 210 to measure the water inlet flow rate, the second pipeline is connected to the water inlet pipe and is located at the rear end of the float flowmeter 210, so as to facilitate the dephosphorus agent concentrate and water to enter the pipeline mixer 190 together, and the outlet of the pipeline mixer 190 is connected to the distribution device 200 through a third pipeline.

[0042] See also Figures 2 to 5 The distribution device includes a support frame 1 and a distribution box 2 arranged on the support frame 1. The top surface of the distribution box 2 is open, and a cover 3 is provided on the top surface of the distribution box 2 to close the top surface of the distribution box 2.

[0043] A flow stabilizing plate 22 and an overflow plate 24 are provided in the distribution box 2. The flow stabilizing plate 22 and the overflow plate 24 are spaced apart and arranged in parallel to divide the distribution box 2 into a medicine feeding chamber, a flow stabilizing chamber and a distribution chamber; a medicine feeding port 21 is provided on one side wall of the distribution box corresponding to the medicine feeding chamber, and the third pipeline is connected to the medicine feeding port 21 to facilitate the dephosphorus agent dilution liquid to flow into the medicine feeding chamber. A number of small flow stabilizing holes are evenly distributed on the lower part of the flow stabilizing plate 22 to facilitate the dephosphorus agent dilution liquid in the medicine feeding chamber to smoothly enter the flow stabilizing chamber, so that the liquid level in the flow stabilizing chamber is stable; a number of partitions 26 are provided in the distribution chamber, and all partitions 26 are parallel and spaced apart. Partitions are set and are perpendicular to the overflow plate 24. The three side edges of the partition 26 are respectively connected to the overflow plate 24, the bottom and the inner wall of the distribution box 2 to divide the distribution chamber into a plurality of distribution slots. The distribution slots correspond one to one with the sedimentation tank to be added. At the same time, an overflow V-shaped groove is provided on the overflow plate 24. The number of overflow V-shaped grooves corresponding to each distribution slot is equal, which facilitates the dephosphorization agent in the steady flow cavity to enter the distribution slot through the overflow V-shaped groove with equal flow rate. The bottom of the distribution box corresponding to the bottom of each distribution slot is provided with a drug outlet 25 for connecting the drug outlet pipe to add the dephosphorization agent dilution liquid in the distribution slot into the sedimentation tank.

[0044] In this way, after the dephosphorus agent dilution liquid enters the medicine inlet chamber from the medicine inlet, the turbulence can be eliminated because the stabilizing hole arranged at the bottom of the flow stabilizing plate is relatively small, so that after the dephosphorus agent dilution liquid in the medicine inlet chamber enters the flow stabilizing chamber, the liquid level in the flow stabilizing chamber is stable, and then the dephosphorus agent dilution liquid in the flow stabilizing chamber enters the distribution tank by overflow, so that the flow rate of the dephosphorus agent dilution liquid entering the distribution tank can be guaranteed to be stable and equal, thereby ensuring that the dephosphorus agent dilution liquid is evenly distributed, and then enters the sedimentation tank from the medicine outlet for dephosphorization.

[0045] There is no limitation on the shape of the flow stabilization hole. It can be a circular hole, a polygonal hole, etc., as long as it can eliminate turbulence. A circular hole is preferred.

[0046] In specific applications, if there are 5 sedimentation tanks, then the distribution device can be set with 5 distribution slots. If there are 8 sedimentation tanks, the distribution device can be set with 8 distribution slots, or two distribution devices can be set, each with 4 distribution slots. Figure 5 As can be seen, this embodiment has five distribution troughs, which can supply the dephosphorization agent dilution liquid to the five sedimentation tanks at equal flow rates. Each distribution trough corresponds to an overflow V-shaped trough. In actual application, each distribution trough can correspond to two or more overflow V-shaped troughs, as long as the number of overflow V-shaped troughs corresponding to each distribution trough is equal, ensuring that the dephosphorization agent dilution liquid enters the distribution trough evenly. In this embodiment, the angle of the overflow V-shaped trough is 60°. At the same time, it can also be found that only one diaphragm pump is needed to pump the dephosphorus removal agent dilution into the distribution box, that is, one diaphragm pump can realize the addition of dephosphorus removal agent dilution liquid to five sedimentation tanks. Compared with the existing technology, the equipment investment of diaphragm pumps can be effectively reduced. For example, if there are 10 sedimentation tanks, each diaphragm pump provides dephosphorus removal agent dilution liquid to two sedimentation tanks, then 5 diaphragm pumps are needed. To ensure normal operation, at least 6 diaphragm pumps are required, that is, five for use and one for backup. However, by using the distribution device in this embodiment, one diaphragm pump can provide dephosphorus removal agent to five sedimentation tanks, so two diaphragm pumps are needed. With one for use and one for backup, only four diaphragm pumps are needed, which effectively reduces the equipment investment of diaphragm pumps.

[0047] During specific implementation, the side wall of the distribution box 2 where the medicine inlet 21 is located is parallel to the flow stabilizing plate 22 .

[0048] In practice, the flow stabilizer 22 is removably mounted within the distribution box 2. Specifically, corresponding slots 23 are provided on the inner wall of the distribution box 2 at both ends of the flow stabilizer. The two ends of the flow stabilizer 22 are locked into the corresponding slots 23, thereby achieving removable installation of the flow stabilizer 22. This facilitates removal of the flow stabilizer for cleaning and maintenance.

[0049] In specific implementation, the bottom of the distribution box 2 corresponding to the medicine inlet cavity is provided with a waste liquid port 27. When the distribution box needs to be cleaned and maintained, the flow stabilizing plate is first removed, and then the residual liquid in the distribution box (medicine inlet cavity and flow stabilizing cavity) is drained through the waste liquid port.

[0050] In specific implementation, the bottom of the distribution box 2 corresponding to each distribution trough is concave downward and has a certain taper, and the drug outlet 25 is arranged at the bottom of the cone to facilitate the dephosphorus agent dilution liquid in the distribution trough to smoothly enter the drug outlet pipe.

[0051] During specific implementation, the support frame 1 includes four vertically arranged columns 11, and the four columns 11 are respectively located at the four vertices of the rectangle. A rectangular frame composed of several horizontally arranged cross bars 12 is provided at the top of the four columns 11. The distribution box 2 is placed on the rectangular frame, and a connecting rod 13 is horizontally provided between two adjacent columns 11. At the same time, a connecting plate 14 is horizontally provided at the bottom of each column 11, which facilitates the connection of the connecting plate 11 to the cement base surface by screws, thereby fixing the support frame 1 on the cement base surface.

[0052] The distribution box is placed on a rectangular frame, which supports it. To ensure its stability, fixed plates can be installed around the box. Bolts secure the fixed plates to the rectangular frame, securing the box to the support frame. Stoppers can also be installed around the rectangular frame to limit the distribution box's position. The connecting plate is placed inside the rectangle formed by the four columns, reducing the device's footprint while improving safety.

[0053] When using the distribution device of the present invention, in order to further improve safety, a safety plate can be wrapped around the supporting frame corresponding to the aisle side.

[0054] Finally, it should be noted that the above embodiments of the present invention are merely examples for illustrating the present invention and are not intended to limit the implementation methods of the present invention. Those skilled in the art will appreciate that other variations and modifications based on the above description are possible. It is not possible to enumerate all implementation methods here. Any obvious variations or modifications arising from the technical solution of the present invention remain within the scope of protection of the present invention.

Claims

1. A phosphorus removal agent dosing system for a sewage treatment plant, characterized in that: It includes a drug storage tank, a pressurizing unit, a dilution unit and a dispensing device; The medicine storage tank is used to store the dephosphorization agent stock solution, and the outlet of the medicine storage tank is connected to a medicine delivery pipe; There are two groups of pressurizing units, each of which includes a dosing pump. The inlet end of the dosing pump is connected to the drug delivery tube through a first pipeline, and a filter and a first valve are provided on the first pipeline. The first valve is provided at the front end of the filter. The outlet end of the dosing pump is connected to the inlet end of the dilution unit through a second pipeline. A pulse damper, a pressure gauge, a back pressure valve and a second valve are provided on the second pipeline in sequence along the fluid flow direction. The dilution unit and distribution device are both arranged beside the sedimentation tank. The dilution unit is used to dilute the dephosphorus removal agent stock solution to obtain the dephosphorus removal agent diluted solution. The distribution device is connected to the outlet end of the dilution unit and is used to evenly distribute the dephosphorus removal agent diluted solution for addition into the sedimentation tank.

2. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 1, characterized in that: The dosing pump outlet is also provided with a reflux pipe, the inlet end of the reflux pipe is connected to the second pipeline, and the other end is connected to the first pipeline and is located at the front end of the first valve. A safety valve is provided on the reflux pipe.

3. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 1 or 2, characterized in that: The dilution unit includes a pipeline mixer, the inlet of the pipeline mixer is connected to a water inlet pipe for introducing water, the water inlet pipe is provided with a float flowmeter to measure the water inlet flow rate, the second pipeline is connected to the water inlet pipe and is located at the rear end of the float flowmeter, so as to facilitate the dephosphorus agent concentrate and water to enter the pipeline mixer together, and the outlet of the pipeline mixer is connected to the distribution device through a third pipeline.

4. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 3, characterized in that: The distribution device includes a support frame and a distribution box body arranged on the support frame, wherein the top surface of the distribution box body is open and a cover body is provided on the top surface of the distribution box body to close the top surface of the distribution box body; A flow stabilizing plate and an overflow plate are provided in the distribution box body, and the flow stabilizing plate and the overflow plate are spaced apart and arranged in parallel to divide the distribution box body into a medicine inlet chamber, a flow stabilizing chamber and a distribution chamber; a medicine inlet is provided on one side wall of the distribution box body corresponding to the medicine inlet chamber, and the third pipeline is connected to the medicine inlet, so that the dephosphorus removal agent dilution liquid flows into the medicine inlet chamber, and a plurality of flow stabilizing holes are evenly distributed on the lower part of the flow stabilizing plate, so that the dephosphorus removal agent dilution liquid in the medicine inlet chamber can smoothly enter the flow stabilizing chamber, so that the liquid level in the flow stabilizing chamber is stable; a plurality of partitions are provided in the distribution chamber, and all the partitions are spaced apart and arranged in parallel and are aligned with the medicine inlet. The overflow plate is vertical, and the edges of the three sides of the partition are respectively connected to the overflow plate, the bottom and the inner wall of the distribution box to divide the distribution chamber into a plurality of distribution slots. The distribution slots correspond one-to-one to the sedimentation tank to be added. At the same time, a number of overflow V-shaped grooves are provided on the overflow plate, and the number of overflow V-shaped grooves corresponding to each distribution slot is equal, so that the dephosphorus removal agent in the steady flow chamber can enter the distribution slot through the overflow V-shaped grooves at equal flow rates. The bottom of the distribution box corresponding to the bottom of each distribution slot is provided with a drug outlet for connecting a drug outlet pipe to add the dephosphorus removal agent dilution liquid in the distribution slot into the sedimentation tank.

5. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 4, characterized in that: The side wall of the distribution box where the medicine inlet is located is parallel to the flow stabilizing plate.

6. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 4 or 5, characterized in that: The flow stabilizing plate is detachably arranged in the distribution box.

7. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 6, characterized in that: The inner wall of the distribution box corresponding to the two ends of the flow stabilizing plate is provided with a card slot corresponding to the flow stabilizing plate, and the two ends of the flow stabilizing plate are clamped in the corresponding card slot, thereby realizing the detachable installation of the flow stabilizing plate.

8. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 7, characterized in that: A waste liquid outlet is provided at the bottom of the distribution box corresponding to the medicine inlet cavity.

9. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 4, characterized in that: The bottom of the distribution box corresponding to each distribution trough is concave downward and has a certain taper. The drug outlet is arranged at the bottom of the cone, so that the dephosphorus agent dilution liquid in the distribution trough can enter the sedimentation tank through the drug outlet pipe.

10. A phosphorus removal agent dosing system for a sewage treatment plant according to claim 4, characterized in that: The support frame includes four vertically arranged columns, which are respectively located at the four vertices of a rectangle. A rectangular frame composed of several horizontally arranged cross bars is provided on the top of the four columns. The distribution box is placed on the rectangular frame. A connecting rod is horizontally provided between two adjacent columns. At the same time, a connecting plate is horizontally provided at the bottom of each column, which facilitates connecting the connecting plate to the horizontal base surface through a fixing piece, thereby fixing the support frame on the horizontal base surface.

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