Automatic feeding device for N and P feedback powdered carbon

Abstract

The invention provides an automatic N and P feedback powdered carbon feeding device. The automatic N and P feedback powdered carbon feeding device comprises a data acquisition assembly, a PLC (Programmable Logic Controller) and a medicament feeding assembly, the data acquisition assembly comprises a TN detector, a TP monitor and a flow monitor. The signal ends of the TN detector, the TP monitor and the flow monitor are connected with the signal end of the PLC. Activated carbon is conveyed into the activated carbon dissolving tank through the screw conveyor, a water source is added into the activated carbon dissolving tank through the water inlet pipe, activated carbon powder and the water source can be fully mixed to form an activated carbon solution through cooperation of the mixing assembly, and the activated carbon solution is conveyed into the activated carbon solution storage tank through the conveying pump and the conveying pipe. The activated carbon solution can be automatically added through the adding pump, compared with a traditional manual adding mode, automatic adding of activated carbon and the activated carbon solution is achieved, the labor cost is reduced, and dust pollution cannot be caused in the adding process.

Description

Technical Field

[0001] The invention relates to a dosing device, in particular to an automatic dosing device for powdered carbon with N and P feedback, belonging to the technical field of sewage treatment. Background Art

[0002] As people's living standards continue to improve, the requirements for drinking water quality are also increasing, and the requirements for drinking water quality are becoming more and more stringent. The problem of odor in water is prevalent worldwide and is an issue that deserves the attention of colleagues in the industry. The geographical distribution of odor problems in water bodies is wide and is not restricted by regions, which is uncertain. Therefore, the study of water odor has become one of the research hotspots of water environment today.

[0003] Currently, raw water is mainly taken from regulating and storage reservoirs. As an important water source, some regulating and storage reservoirs have large storage capacity, external pollution, low raw water intake of water plants, etc., and the raw water of water plants has problems such as low dissolved oxygen, excessive iron and manganese, eutrophication of water sources and massive reproduction of algae. The seasonal fluctuation of 2-MIB of raw water entering the plant is particularly prominent.

[0004] At present, in the field of water treatment, activated carbon is widely used, but there are still the following technical problems in the process of water treatment: (1) Most of the dosing methods are done manually. The activated carbon is quantitatively added into the mixing tank and fully mixed with water. The prepared solution is then pumped to the dosing point by a pump. This dosing method is time-consuming and labor-intensive, and requires a certain amount of manpower, which increases labor costs. At the same time, the addition of activated carbon is prone to dust pollution, which is difficult to clean; (2) The time of adding activated carbon needs to be adjusted manually according to the changes in water quality. If the water quality changes suddenly and is not discovered in time, it is easy to cause the activated carbon to be added in time and the effluent water quality is likely to exceed the standard; Therefore, an automatic powdered carbon dosing device with N and P feedback is proposed. Summary of the invention

[0005] In view of this, the present invention provides an N, P feedback pulverized carbon automatic dosing device to solve or alleviate the technical problems existing in the prior art and at least provide a beneficial choice.

[0006] The technical solution of the embodiment of the present invention is implemented as follows: an N, P feedback powdered carbon automatic dosing device, including a data acquisition component, a PLC controller and a reagent dosing component; The data acquisition component includes a TN detector, a TP monitor and a flow monitor, and the signal ends of the TN detector, the TP monitor and the flow monitor are all connected to the signal end of the PLC controller; The agent dosing assembly includes a carbon powder storage tank, a screw feeder, an activated carbon dissolving tank, a delivery pump, a delivery pipe, an activated carbon solution storage tank, a discharge pipe, a dosing pump and a water inlet pipe; The discharge port of the carbon powder storage tank is connected with the feed port of the screw feeder through a pipeline, the discharge port of the screw feeder is connected with the feed port of the activated carbon dissolution tank through a pipeline, the discharge pipe of the activated carbon dissolution tank is connected with the liquid inlet of the delivery pump, the liquid outlet of the delivery pump is connected with the activated carbon solution storage tank through the delivery pipe, the discharge pipe of the activated carbon solution storage tank is connected with the liquid inlet of the dosing pump, the discharge port of the dosing pump is connected with the discharge pipe, and the water inlet pipe is installed on the top of the activated carbon dissolution tank.

[0007] Further preferably, the PLC controller is installed on the outer wall of the activated carbon solution storage tank, and a third solenoid valve is installed on the outer wall of the water inlet pipe.

[0008] Further preferably, a mixing assembly is installed inside the activated carbon dissolution tank, and the mixing assembly includes a mixing motor, a rotating rod, three stirring rods, a sliding rod, a limiting groove, a tension spring and two limiting blocks; The top end of the rotating rod is fixedly connected to the output shaft of the mixing motor, the three stirring rods are equidistantly fixedly connected to the outer wall of the rotating rod, the sliding rod is slidably connected to the inner wall of the stirring rod, the limiting grooves are symmetrically opened on the outer wall of the sliding rod, the tension spring is located inside the stirring rod, and the two limiting blocks are symmetrically fixedly connected to the front surface and the rear surface of the sliding rod.

[0009] Further preferably, the limit block is slidably connected to the inner wall of the limit groove, one end of the tension spring is fixedly connected to the stirring rod, and the other end of the tension spring is fixedly connected to the sliding rod.

[0010] Further preferably, adjacent surfaces of two adjacent stirring rods are fixedly connected with connecting rods, and one end of the sliding rod away from the stirring rod is fixedly connected with a stirring frame.

[0011] Further preferably, the mixing motor is mounted on the upper surface of the activated carbon dissolution tank, the bottom end of the rotating rod is rotatably connected to the inner bottom wall of the activated carbon dissolution tank, and the rotating rod is located inside the activated carbon dissolution tank.

[0012] Further preferably, a weighing assembly is installed on the outer side wall of the carbon powder storage tank, and the weighing assembly includes a limit seat, a sliding ring, three support frames and a pressure sensor; The sliding ring is slidably connected to the inner side wall of the limiting seat, the three support frames are symmetrically fixedly connected to the lower surface of the limiting seat, and the two ends of the pressure sensor are respectively installed on the lower surface of the sliding ring and the inner bottom wall of the limiting seat.

[0013] Further preferably, the outer side wall of the carbon powder storage tank is slidably connected to the inner side wall of the limit seat, the lower surface of the carbon powder storage tank is attached to the upper surface of the sliding ring, and the screw feeder is installed on the outer side wall of the support frame.

[0014] Further preferably, an agitator is rotatably connected to the inner bottom wall of the activated carbon solution storage tank, a driving motor is installed on the lower surface of the activated carbon solution storage tank, and an output shaft of the driving motor is fixedly connected to the agitator.

[0015] Further preferably, a second solenoid valve is installed on the outer side wall of the drain pipe of the activated carbon solution storage tank, and a first solenoid valve is installed on the outer side wall of the drain pipe of the activated carbon dissolution tank.

[0016] The embodiment of the present invention has the following advantages due to the adoption of the above technical solution: 1. The present invention conveys activated carbon to an activated carbon dissolution tank through a screw feeder, adds water to the activated carbon dissolution tank through a water inlet pipe, and through the cooperation of a mixing component, can fully mix activated carbon powder and water to form an activated carbon solution, and conveys the activated carbon solution to an activated carbon solution storage tank through a delivery pump and a delivery pipe, and can realize automatic dosing of the activated carbon solution through a dosing pump. Compared with the traditional manual dosing method, the present invention realizes automatic dosing of activated carbon and activated carbon solution, reduces labor costs, and does not cause dust pollution during the dosing process.

[0017] 2. The present invention monitors the total nitrogen, water volume and total phosphorus of the water plant inlet respectively through the TN monitor, the flow monitor and the TP monitor, and then sends the digital signal to the PLC controller to calculate the dosage of powdered activated carbon, and feeds back the dosage of activated carbon to the PLC controller. The PLC controller controls the dosing pump and adjusts the discharge flow of the discharge pipe in real time. The present invention monitors the water quality of the water plant inlet water, and then adjusts the dosage of activated carbon in real time according to the water quality, so as to avoid the situation where sudden changes in water quality occur without timely detection, thereby ensuring the stability of water quality.

[0018] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0020] Figure 1 It is a structural diagram of the drug dosing assembly of the present invention; Figure 2 It is a schematic diagram of the connection between the activated carbon dissolution tank and the activated carbon solution storage tank of the present invention; Figure 3 It is a structural diagram of the mixing assembly of the present invention; Figure 4 It is a structural diagram of the stirring rod of the present invention; Figure 5 It is a structural diagram of the sliding rod of the present invention; Figure 6 It is a structural diagram of the weighing assembly of the present invention; Figure 7 It is a structural diagram of the sliding ring of the present invention; Figure 8 It is a structural diagram of the agitator of the present invention; Fig. 9 It is a structural diagram of the data acquisition component of the present invention.

[0021] Figure numerals: 101, drug dosing component; 11, carbon powder storage tank; 12, screw feeder; 13, activated carbon dissolution tank; 14, first solenoid valve; 15, delivery pump; 16, delivery pipe; 17, activated carbon solution storage tank; 18, PLC controller; 19, drive motor; 20, dosing pump; 21, discharge pipe; 22, second solenoid valve; 23, water inlet pipe; 24, third solenoid valve; 25, agitator; 301, mixing component; 31, mixing motor; 32, rotating rod; 33, stirring rod; 34, connecting rod; 35, stirring frame; 36, sliding rod; 37, limiting groove; 38, tension spring; 39, limiting block; 401, weighing component; 41, limiting seat; 42, sliding ring; 43, supporting frame; 44, pressure sensor. DETAILED DESCRIPTION

[0022] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0023] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] like Figure 1-Figure 9 As shown, the embodiment of the present invention provides an N, P feedback powdered carbon automatic dosing device, including a data acquisition component, a PLC controller 18 and a reagent dosing component 101; The data acquisition components include a TN detector, a TP monitor and a flow monitor, and the signal terminals of the TN detector, the TP monitor and the flow monitor are all connected to the signal terminal of the PLC controller 18; TN monitor, flow monitor and TP monitor are installed at the water inlet of the water plant. TN monitor is used to monitor the total nitrogen index of the water plant inlet, TP monitor is used to monitor the total phosphorus index of the water plant inlet, and flow monitor is used to monitor the water volume of the water plant inlet. The reagent dosing assembly 101 includes a carbon powder storage tank 11, a screw feeder 12, an activated carbon dissolution tank 13, a delivery pump 15, a delivery pipe 16, an activated carbon solution storage tank 17, a discharge pipe 21, a dosing pump 20 and a water inlet pipe 23; The discharge port of the carbon powder storage tank 11 is connected to the feed port of the screw feeder 12 through a pipeline, the discharge port of the screw feeder 12 is connected to the feed port of the activated carbon dissolving tank 13 through a pipeline, the discharge pipe of the activated carbon dissolving tank 13 is connected to the liquid inlet of the delivery pump 15, the liquid outlet of the delivery pump 15 is connected to the activated carbon solution storage tank 17 through the delivery pipe 16, the discharge pipe of the activated carbon solution storage tank 17 is connected to the liquid inlet of the dosing pump 20, the discharge port of the dosing pump 20 is connected to the discharge pipe 21, and the water inlet pipe 23 is installed on the top of the activated carbon dissolving tank 13; The total nitrogen, water volume and total phosphorus of the water inlet of the water plant are monitored respectively by the TN monitor, the flow monitor and the TP monitor, and then the digital signal is sent to the computer through the PLC controller 18, and the BP neural network model is used to combine the data of the flow monitor and the concentration of the activated carbon solution to calculate the dosage of the powdered activated carbon, and then the dosage of the activated carbon is fed back to the PLC controller 18, and the PLC controller 18 controls the dosing pump 20 to adjust the discharge flow of the discharge pipe 21 in real time; The dosing pump 20 is a metering pump, which can accurately control the flow rate of the discharge pipe 21; When the TN monitor and the TP monitor detect a sudden change in the water quality of the water source, the digital signal is transmitted to the PLC controller 18. The PLC controller 18 calculates the amount of activated carbon M that needs to be added through the neural network model combined with the data detected by the flow monitor, and then calculates the final flow rate X of the activated carbon that needs to be added according to the concentration n of the configured activated carbon solution. According to the value of X, the PLC controller 18 adjusts the flow rate of the dosing pump 20 for precise dosing; The calculation formula for the amount of activated carbon is: ; in: M is the amount of activated carbon, C is the concentration of pollutants in the water, Q is the water inflow of the water plant, and q is the reaction capacity of the activated carbon; The calculation formula for the addition flow rate of activated carbon solution is: ; in: X is the addition flow rate of activated carbon, and n is the concentration of activated carbon solution.

[0025] In one embodiment, a PLC controller 18 is installed on the outer wall of an activated carbon solution storage tank 17, a third solenoid valve 24 is installed on the outer wall of a water inlet pipe 23, a second solenoid valve 22 is installed on the outer wall of a discharge pipe of the activated carbon solution storage tank 17, and a first solenoid valve 14 is installed on the outer wall of a discharge pipe of an activated carbon dissolution tank 13. The electrical end of the PLC controller 18 is connected to the electrical ends of the first solenoid valve 14, the second solenoid valve 22 and the third solenoid valve 24. By controlling the three solenoid valves through the PLC controller 18, the on and off of the activated carbon solution and the water inlet can be controlled.

[0026] In one embodiment, a mixing assembly 301 is installed inside the activated carbon dissolution tank 13, and the mixing assembly 301 includes a mixing motor 31, a rotating rod 32, three stirring rods 33, a sliding rod 36, a limiting groove 37, a tension spring 38 and two limiting blocks 39; The top of the rotating rod 32 is fixedly connected to the output shaft of the mixing motor 31, three stirring rods 33 are equidistantly fixedly connected to the outer wall of the rotating rod 32, the sliding rod 36 is slidably connected to the inner wall of the stirring rod 33, the limiting groove 37 is symmetrically arranged on the outer wall of the sliding rod 36, the tension spring 38 is located inside the stirring rod 33, two limiting blocks 39 are symmetrically fixedly connected to the front surface and the rear surface of the sliding rod 36, the adjacent surfaces of two adjacent stirring rods 33 are fixedly connected with the connecting rod 34, and the end of the sliding rod 36 away from the stirring rod 33 is fixedly connected with the stirring frame 35; When the mixing motor 31 drives the rotating rod 32 to rotate, the rotating rod 32 drives the stirring rod 33 to rotate. Through the cooperation of the stirring rod 33 and the connecting rod 34, the water and the activated carbon powder in the activated carbon dissolving tank 13 can be stirred to accelerate the dissolution of the activated carbon powder. Since the sliding rod 36 slides in the stirring rod 33, as the stirring rod 33 rotates, under the action of centrifugal force, the sliding rod 36 moves away from the rotating rod 32, and the sliding rod 36 drives the stirring frame 35 to stir the activated carbon powder at the edge.

[0027] In one embodiment, the limit block 39 is slidably connected to the inner wall of the limit groove 37, one end of the tension spring 38 is fixedly connected to the stirring rod 33, and the other end of the tension spring 38 is fixedly connected to the sliding rod 36. The mixing motor 31 is controlled to change speed evenly by the PLC controller 18, and the centrifugal force exerted on the sliding rod 36 is constantly changing. Under the pull of the tension spring 38, the sliding rod 36 can slide back and forth in the stirring rod 33, and the sliding rod 36 drives the stirring frame 35, and the stirring frame 35 moves back and forth when rotating, thereby improving the mixing effect so that the activated carbon powder and the water source are fully mixed.

[0028] In one embodiment, the mixing motor 31 is installed on the upper surface of the activated carbon dissolution tank 13, the bottom end of the rotating rod 32 is rotatably connected to the inner bottom wall of the activated carbon dissolution tank 13, and the rotating rod 32 is located inside the activated carbon dissolution tank 13. By limiting the position of the bottom end of the rotating rod 32, the stability of the mixing assembly 301 can be enhanced.

[0029] In one embodiment, a weighing assembly 401 is installed on the outer side wall of the carbon powder storage tank 11, and the weighing assembly 401 includes a limit seat 41, a sliding ring 42, three support frames 43 and a pressure sensor 44; The sliding ring 42 is slidably connected to the inner side wall of the limiting seat 41, three support frames 43 are symmetrically fixedly connected to the lower surface of the limiting seat 41, two ends of the pressure sensor 44 are respectively installed on the lower surface of the sliding ring 42 and the inner bottom wall of the limiting seat 41, the outer side wall of the carbon powder storage tank 11 is slidably connected to the inner side wall of the limiting seat 41, the lower surface of the carbon powder storage tank 11 is attached to the upper surface of the sliding ring 42, and the screw feeder 12 is installed on the outer side wall of the support frame 43; When the screw feeder 12 is working, the weight of the toner in the toner storage tank 11 decreases, and then the weight of the toner storage tank 11 can be weighed by the pressure sensor 44 to calculate the amount of toner used; The screw feeder 12 is connected to the carbon powder storage tank 11 by a hose; The signal end of the pressure sensor 44 is connected to the signal end of the PLC controller 18, and the electrical end of the PLC controller 18 is respectively connected to the electrical ends of the delivery pump 15, the drive motor 19 and the dosing pump 20. The model of the PLC controller 18 is: GCAN-PLC-326-E, and the model of the pressure sensor 44 is: FC-FTLC.

[0030] In one embodiment, the inner bottom wall of the activated carbon solution storage tank 17 is rotatably connected to an agitator 25, and a drive motor 19 is installed on the lower surface of the activated carbon solution storage tank 17. The output shaft of the drive motor 19 is fixedly connected to the agitator 25. The agitator 25 is driven to rotate by the drive motor 19, and the agitator 25 stirs the activated carbon solution in the activated carbon solution storage tank 17, which can prevent the activated carbon solution from generating precipitation.

[0031] When the present invention is working: the activated carbon is conveyed to the activated carbon dissolving tank 13 through the screw feeder 12, and water is added to the activated carbon dissolving tank 13 through the water inlet pipe 23. The rotating rod 32 is driven by the mixing motor 31, and the rotating rod 32 drives the stirring rod 33 to rotate. Through the cooperation of the stirring rod 33 and the connecting rod 34, the water and the activated carbon powder in the activated carbon dissolving tank 13 can be stirred. Under the action of centrifugal force, the sliding rod 36 moves in the direction away from the rotating rod 32, and the sliding rod 36 drives the stirring frame 35 to stir the activated carbon powder located at the edge position. The mixing motor 31 is controlled by the PLC controller 18 to change speed evenly, thereby improving the mixing effect, so that the activated carbon powder and the water source are fully mixed. The activated carbon solution is conveyed to the activated carbon solution storage tank 17 through the conveying pump 15 and the conveying pipe 16, and the automatic addition of the activated carbon solution can be realized through the dosing pump 20. When the TN monitor and the TP monitor detect a sudden change in the water quality at the water source, the digital signal is transmitted to the PLC controller 18. The PLC controller 18 calculates the amount of activated carbon that needs to be added, and then calculates the final flow rate of activated carbon that needs to be added. Based on the numerical value, the PLC controller 18 adjusts the flow rate of the dosing pump 20 for precise addition.

[0032] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of various changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. An automatic dosing device for powdered carbon with N and P feedback, comprising a data acquisition component, a PLC controller (18) and a reagent dosing component (101), characterized in that: The data acquisition component comprises a TN detector, a TP monitor and a flow monitor, and the signal ends of the TN detector, the TP monitor and the flow monitor are all connected to the signal end of the PLC controller (18); The agent dosing assembly (101) comprises a carbon powder storage tank (11), a screw conveyor (12), an activated carbon dissolving tank (13), a delivery pump (15), a delivery pipe (16), an activated carbon solution storage tank (17), a discharge pipe (21), a dosing pump (20) and a water inlet pipe (23); The discharge port of the carbon powder storage tank (11) is connected to the feed port of the screw feeder (12) through a pipeline, the discharge port of the screw feeder (12) is connected to the feed port of the activated carbon dissolution tank (13) through a pipeline, the discharge pipe of the activated carbon dissolution tank (13) is connected to the liquid inlet of the delivery pump (15), the liquid outlet of the delivery pump (15) is connected to the activated carbon solution storage tank (17) through the delivery pipe (16), the discharge pipe of the activated carbon solution storage tank (17) is connected to the liquid inlet of the dosing pump (20), the discharge port of the dosing pump (20) is connected to the discharge pipe (21), and the water inlet pipe (23) is installed on the top of the activated carbon dissolution tank (13).

2. According to claim 1, the N, P feedback powdered carbon automatic dosing device is characterized by: The PLC controller (18) is installed on the outer wall of the activated carbon solution storage tank (17), and a third solenoid valve (24) is installed on the outer wall of the water inlet pipe (23).

3. The N and P feedback powdered carbon automatic dosing device according to claim 2 is characterized by: A mixing assembly (301) is installed inside the activated carbon dissolution tank (13), and the mixing assembly (301) comprises a mixing motor (31), a rotating rod (32), three stirring rods (33), a sliding rod (36), a limiting groove (37), a tension spring (38) and two limiting blocks (39); The top end of the rotating rod (32) is fixedly connected to the output shaft of the mixing motor (31); the three stirring rods (33) are equidistantly fixedly connected to the outer wall of the rotating rod (32); the sliding rod (36) is slidably connected to the inner wall of the stirring rod (33); the limiting groove (37) is symmetrically arranged on the outer wall of the sliding rod (36); the tension spring (38) is located inside the stirring rod (33); and the two limiting blocks (39) are symmetrically fixedly connected to the front surface and the rear surface of the sliding rod (36).

4. The N, P feedback powdered carbon automatic dosing device according to claim 3 is characterized by: The limit block (39) is slidably connected to the inner wall of the limit groove (37), one end of the tension spring (38) is fixedly connected to the stirring rod (33), and the other end of the tension spring (38) is fixedly connected to the sliding rod (36).

5. The N and P feedback powdered carbon automatic dosing device according to claim 4 is characterized by: The adjacent surfaces of two adjacent stirring rods (33) are fixedly connected to a connecting rod (34), and one end of the sliding rod (36) away from the stirring rod (33) is fixedly connected to a stirring frame (35).

6. The N, P feedback powdered carbon automatic dosing device according to claim 5 is characterized by: The mixing motor (31) is mounted on the upper surface of the activated carbon dissolution tank (13), the bottom end of the rotating rod (32) is rotatably connected to the inner bottom wall of the activated carbon dissolution tank (13), and the rotating rod (32) is located inside the activated carbon dissolution tank (13).

7. The N, P feedback powdered carbon automatic dosing device according to claim 6 is characterized by: A weighing assembly (401) is installed on the outer side wall of the carbon powder storage tank (11), and the weighing assembly (401) comprises a limit seat (41), a sliding ring (42), three support frames (43) and a pressure sensor (44); The sliding ring (42) is slidably connected to the inner side wall of the limiting seat (41), the three support frames (43) are symmetrically fixedly connected to the lower surface of the limiting seat (41), and the two ends of the pressure sensor (44) are respectively mounted on the lower surface of the sliding ring (42) and the inner bottom wall of the limiting seat (41).

8. The N and P feedback powdered carbon automatic dosing device according to claim 7 is characterized by: The outer wall of the carbon powder storage tank (11) is slidably connected to the inner wall of the limiting seat (41), the lower surface of the carbon powder storage tank (11) is in contact with the upper surface of the sliding ring (42), and the screw feeder (12) is mounted on the outer wall of the support frame (43).

9. The N, P feedback powdered carbon automatic dosing device according to claim 8, characterized in that: The inner bottom wall of the activated carbon solution storage tank (17) is rotatably connected to a stirrer (25), and a drive motor (19) is mounted on the lower surface of the activated carbon solution storage tank (17), wherein an output shaft of the drive motor (19) is fixedly connected to the stirrer (25).

10. The N, P feedback powdered carbon automatic dosing device according to claim 9, characterized in that: A second solenoid valve (22) is installed on the outer wall of the drainage pipe of the activated carbon solution storage tank (17), and a first solenoid valve (14) is installed on the outer wall of the drainage pipe of the activated carbon dissolution tank (13).

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