A dosing device and method for treating heavy metal capturer wastewater

Abstract

The present invention belongs to the technical field of wastewater treatment, and specifically relates to a chemical dosing device and method for treating heavy metal scavenger wastewater, including an on-line test component; the on-line test component includes a data processing unit, a control unit and a test box fixedly connected to the outside of the purification tank; a sampling pipe is communicated between the test box and the water inlet pipe; a delivery pipe is communicated between the test box and the medicine box; the sampling pipe and the delivery pipe are both equipped with solenoid valves and flow meters; a turbidity sensor is arranged inside the test box. The required dosage of the scavenger can be quickly obtained before wastewater treatment, avoiding the cumbersome steps of laboratory operations, greatly improving the working efficiency of wastewater treatment, and the on-line test component skips the step of measuring the concentration of heavy metal ions in the wastewater, directly and accurately controlling the actual dosage, keeping it relatively balanced with the heavy metal concentration, ensuring complete treatment of heavy metal ions and fully digesting the scavenger.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, in particular to a heavy metal capture agent wastewater treatment dosing device and method. Background Art

[0002] In the process of industrial production, especially in metal processing, electroplating, metallurgy, mining and other industries, wastewater containing heavy metals is often produced. The harmful substances in heavy metal wastewater not only cause serious pollution to the ecological environment of the water body, but also pose a long-term threat to human health, soil quality and water quality. Therefore, how to effectively remove heavy metal ions in wastewater has become a technical problem that needs to be solved urgently in the field of environmental protection. The role of heavy metal scavengers is to convert harmful heavy metal ions (such as lead, cadmium, chromium, copper, mercury, zinc, etc.) dissolved in water into removable solid forms, thereby effectively purifying wastewater and reducing the harm of heavy metals to the environment and human health.

[0003] A Chinese patent application CN103420466B discloses a dosing reaction device and a wastewater purification device, the technical solution of which is as follows: it includes a reaction chamber with a water outlet hole at the top, a wastewater supply device for conveying wastewater mixed with liquid medicine to the bottom of the reaction chamber, and an air supply device located below the wastewater supply device, the wastewater supply device includes a main pipeline, a branch pipe and a secondary branch pipe introduced into the reaction chamber, a water spray hole is provided on the secondary branch pipe, and the air supply device includes an air supply main pipe and an air supply branch pipe, each of which is provided with an air jet hole. The dosing reaction device, by providing a wastewater supply device and an air supply device, can quickly disperse the wastewater into the reaction chamber, and can also accelerate the mixing speed of the medicine and the wastewater through air and ensure that the two can be mixed evenly, and the structure is simple and easy to maintain.

[0004] However, the prior art of the above-mentioned scheme usually needs to determine the amount of heavy metal scavenger to be added before treating wastewater. Too little addition will lead to incomplete treatment of heavy metal ions, while too much addition will cause waste of scavenger. However, in actual work, when faced with unfamiliar wastewater and wastewater from different batches, it is difficult to accurately know the types and concentrations of heavy metal ions contained therein. Therefore, it is necessary to use chemical experiments in the laboratory in advance to determine the actual amount of heavy metal scavenger to be added. The process is relatively cumbersome and will consume a lot of time and energy, and it is difficult to meet the needs of efficient wastewater treatment of modern processes.

[0005] To this end, the present invention provides a heavy metal capture agent wastewater treatment dosing device and method. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problems is as follows: A dosing device for treating heavy metal capturer wastewater according to the present invention includes:

[0008] A purification tank, which is used to treat wastewater containing heavy metal ions; an inlet pipeline is connected to one side of the purification tank;

[0009] A medicine box, which is arranged on the top of the purification tank; the inside of the medicine box is used to store heavy metal capturer;

[0010] A dosing component, which is arranged between the medicine box and the purification tank; the dosing component is used to control the addition of the heavy metal capturer inside the medicine box into the purification tank;

[0011] It further includes an on-line test component; the on-line test component is used to take samples and conduct quantitative tests on the wastewater before treatment to determine the actual addition amount of the heavy metal capturer;

[0012] The on-line test component includes a data processing unit, a control unit and a test box fixedly connected to the outside of the purification tank; a sampling pipe is connected between the test box and the inlet pipeline; a delivery pipe is connected between the test box and the medicine box; solenoid valves and flow meters are equipped on both the sampling pipe and the delivery pipe; a turbidity sensor is arranged inside the test box.

[0013] Preferably, a reflux pipe is connected between the test box and the purification tank; a solenoid valve is equipped on the reflux pipe.

[0014] Preferably, a water distribution ring is arranged on the outside of the inlet pipeline; the water distribution ring is designed as a hollow structure and is interconnected with the sampling pipe; the water distribution ring and the inlet pipeline are interconnected through a group of branch pipes evenly distributed in a circle.

[0015] Preferably, a group of partition plates are evenly distributed inside the test box; the partition plates evenly divide the inside of the test box into a group of compartments; a group of sub-storage boxes are arranged inside the medicine box; different types of heavy metal capturers are respectively stored inside the sub-storage boxes; the number of the sub-storage boxes, the delivery pipes, the reflux pipes and the turbidity sensors is the same as that of the compartments and they correspond one by one; the sub-storage boxes and the delivery pipes are interconnected with each other.

[0016] Preferably, a chute is arranged inside the partition plate; a guide groove is arranged at the corresponding position on the top of the partition plate; a blocking piece is slidably connected inside the chute; a floating block is slidably connected inside the guide groove, and the floating block is fixedly connected with the blocking piece; a connecting hole is arranged at the bottom of the partition plate; a through groove is arranged at the corresponding position of the bottom of the blocking piece with respect to the connecting hole.

[0017] Preferably, a rotating shaft is rotatably connected inside the test box; the rotating shaft is driven by a motor; a group of paddles are fixedly connected to the rotating shaft at the corresponding positions of each compartment.

[0018] Preferably, one end of the paddle away from the rotating shaft is fixedly connected with an arc-shaped piece; an elastic friction pad is fixedly connected to the outside of the arc-shaped piece.

[0019] Preferably, the elastic friction pad is designed as a hollow structure, and a water-absorbing member is fixedly connected to the inside thereof; a group of guide holes are evenly distributed on the outside of the elastic friction pad.

[0020] A method for adding medicine to heavy metal capturer wastewater treatment, which uses the above-mentioned heavy metal capturer wastewater treatment medicine adding device, includes the following steps:

[0021] S1. Sampling stage: The wastewater is discharged into the purification tank through the water inlet pipe. During the drainage process, the sampling pipe is controlled to be opened, and the wastewater is introduced into the test box. The flowmeter is used to quantitatively control the amount of sampled wastewater.

[0022] S2. Data recording stage: The conveying pipe is controlled to be opened, and the heavy metal capturer in the medicine box enters the test box to mix and react with the wastewater sample, generating flocculent precipitation. The flowmeter is used to obtain the addition amount of the capturer in real time, the turbidity sensor is used to measure the turbidity in real time, and the data is recorded by the data processing unit.

[0023] S3. Data analysis stage: When the data processing unit senses that the turbidity no longer increases, the control unit controls the conveying pipe to close. Then the data processing unit determines the time node when the turbidity first reaches the peak value, and obtains the addition amount of the capturer corresponding to this time node, which is the test addition amount for this test.

[0024] S4. Dosage calculation stage: The data processing unit combines the test addition amount, the test wastewater amount and the wastewater amount in the purification tank to calculate the actual addition dosage of the heavy metal capturer that needs to be added to the purification tank.

[0025] S5. Medicine adding treatment stage: The heavy metal capturer in the medicine box is controlled by the medicine adding component to be input into the purification tank at the corresponding addition dosage for wastewater treatment work.

[0026] S6. Recovery stage: The return pipe is controlled to be opened, and the wastewater and the residual capturer in the test box are discharged into the purification tank together.

[0027] The beneficial effects of the present invention are as follows:

[0028] 1. A dosing device and method for treating heavy metal capturer wastewater according to the present invention, by setting up an on-line test component, automatically controlling the cooperation of various instruments, quickly obtaining the required dosage of the heavy metal capturer before wastewater treatment, avoiding the cumbersome steps of laboratory operations, being able to greatly improve the working efficiency of wastewater treatment, and this on-line test component skips the step of measuring the concentration of heavy metal ions in the wastewater, directly and accurately controlling the actual dosage, keeping it relatively balanced with the heavy metal concentration, ensuring that heavy metal ions are completely treated and the capturer is fully digested, and avoiding various problems caused by excessive or insufficient addition of the capturer.

[0029] 2. A dosing device and method for treating heavy metal capturer wastewater according to the present invention, by setting up multiple sub-storage tanks and compartments, adding different types of heavy metal capturers into different compartments to conduct wastewater tests respectively, and then using the data processing unit to compare the turbidity in different compartments and determine the type of capturer corresponding to the compartment with the highest turbidity. This capturer is the most suitable type for this batch of wastewater. When adding medicine to the purification tank later, using this capturer can improve the removal efficiency of heavy metal ions. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention will be further described below with reference to the drawings.

[0031] Figure 1 is a three-dimensional view of the present invention;

[0032] Figure 2 is Figure 1 a partial enlarged view of part A in

[0033] Figure 3 is a structural schematic diagram of the test box in the present invention;

[0034] Figure 4 is a structural schematic diagram inside the test box in the present invention;

[0035] Figure 5 is a cross-sectional view of the partition board in the present invention;

[0036] Figure 6 is a cross-sectional view of the test box in the present invention;

[0037] Figure 7 is Figure 6 a partial enlarged view of part B in

[0038] Figure 8 is a schematic flow chart of the method of the present invention.

[0039] In the figure: purification tank 1, inlet pipe 2, medicine box 3, test box 4, sampling pipe 5, delivery pipe 6, turbidity sensor 7, return pipe 8, water distribution ring 9, branch pipe 10, partition plate 11, compartment 12, sliding groove 13, guiding groove 14, blocking piece 15, floating block 16, connecting hole 17, through groove 18, rotating shaft 19, motor 20, paddle 21, arc-shaped piece 22, elastic friction pad 23, water-absorbing part 24, guiding hole 25. Detailed implementation mode

[0040] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below in conjunction with the specific implementation mode.

[0041] As Figures 1 to 7 shown, a dosing device for treating heavy metal scavenger wastewater according to the present invention includes:

[0042] Purification tank 1, which is used to treat wastewater containing heavy metal ions; one side of the purification tank 1 is connected to an inlet pipe 2;

[0043] Medicine box 3, which is arranged on the top of the purification tank 1; the inside of the medicine box 3 is used to store heavy metal scavenger;

[0044] Dosing assembly, which is arranged between the medicine box 3 and the purification tank 1; the dosing assembly is used to control the addition of heavy metal scavenger inside the medicine box 3 to the inside of the purification tank 1, which is a prior art and will not be elaborated here;

[0045] It further includes an on-line test assembly; the on-line test assembly is used to sample and quantitatively test the wastewater before treatment to determine the actual addition amount of the heavy metal scavenger;

[0046] The on-line test assembly includes a data processing unit, a control unit and a test box 4 fixedly connected to the outside of the purification tank 1; a sampling pipe 5 is connected between the test box 4 and the inlet pipe 2; a delivery pipe 6 is connected between the test box 4 and the medicine box 3; solenoid valves and flow meters are equipped on both the sampling pipe 5 and the delivery pipe 6; a turbidity sensor 7 is arranged inside the test box 4.

[0047] The prior art usually needs to determine the addition amount of the heavy metal scavenger before treating wastewater. If the addition amount is too small, it will lead to incomplete treatment of heavy metal ions, and if the addition amount is too large, it will cause waste of the scavenger. However, in actual work, in the face of unfamiliar wastewater and wastewater of different batches, it is difficult to accurately know the types and concentrations of heavy metal ions contained therein. Therefore, it is necessary to pre-determine the actual addition amount of the heavy metal scavenger by means of chemical tests in the laboratory. The process is relatively cumbersome, which will consume a lot of time and energy and is difficult to meet the high-efficiency wastewater treatment requirements of modern processes.

[0048] Before the wastewater treatment work, the wastewater is discharged into the purification tank 1 through the water inlet pipe 2. During the drainage process, the sampling pipe 5 is controlled to open, and the wastewater inside the water inlet pipe 2 is introduced into the test box 4. The flowmeter is used to quantitatively control the amount of wastewater entering the test box 4. Then, the delivery pipe 6 is controlled to open, and the heavy metal scavenger inside the medicine box 3 enters the test box 4 to mix and react with the wastewater sample. It chelates with the heavy metal ions in the wastewater to produce flocculent precipitates. The more precipitates there are, the more turbid the wastewater is. During the process of the scavenger continuously entering the test box 4, the flowmeter is used to obtain the addition amount in real time, and the turbidity sensor 7 is used to measure the turbidity inside the test box 4 in real time.

[0049] It should be known that the heavy metal scavenger reacts with the heavy metal ions in the wastewater. As the scavenger is gradually added, the reaction continues, and the generated flocculent precipitates increase continuously, and the turbidity also increases accordingly. When the heavy metal ions in the wastewater have completely reacted, adding more scavenger will no longer change the turbidity. The data processing unit records the data of the flowmeter and the turbidity sensor 7 and the corresponding time nodes in real time. When it senses that the turbidity data no longer increases, it means that the heavy metals in the wastewater have been completely treated. Then the control unit controls the delivery pipe 6 to close. Furthermore, the data processing unit determines the time node when the turbidity first reaches the maximum value and obtains the addition amount of the scavenger corresponding to this time node, which is the test addition amount for this test. Then, by combining the test addition amount, the test wastewater volume, and the wastewater volume in the purification tank 1, the actual addition dose of the heavy metal scavenger to be added to the purification tank 1 is calculated. Then, the heavy metal scavenger inside the medicine box 3 is controlled by the dosing assembly to be input into the purification tank 1 at this addition amount to carry out the wastewater treatment work.

[0050] By setting up the on-line test assembly, various instruments are automatically controlled to cooperate with each other, and the required addition amount of the scavenger can be quickly obtained before the wastewater treatment, avoiding the cumbersome steps of laboratory operations, which can greatly improve the working efficiency of wastewater treatment. And this on-line test assembly skips the step of measuring the concentration of heavy metal ions in the wastewater, directly and accurately controls the actual dosing amount, making it relatively balanced with the heavy metal concentration, ensuring that the heavy metal ions are completely treated and the scavenger is fully digested, and avoiding various problems caused by excessive or insufficient addition of the scavenger.

[0051] In addition, the sampling stage in the above process can be further optimized. Since the composition of the wastewater is different at different time nodes even for the same batch of wastewater when it flows through the inlet pipe 2 into the purification tank 1, it is advisable to control the solenoid valve of the sampling pipe 5 to open and close intermittently during sampling, so that the wastewater at different time nodes inside the inlet pipe 2 can enter the test box 4 respectively and then be mixed inside the test box. The opening and closing cycle of the solenoid valve is determined according to the actual discharge process of the wastewater. By this form of discrete sampling, the composition uniformity of the collected wastewater samples can be improved as much as possible, and the reliability and representativeness of the sample test can be enhanced.

[0052] As a preferred embodiment of the present invention, a return pipe 8 is connected between the test box 4 and the purification tank 1; the return pipe 8 is equipped with a solenoid valve. In the data recording stage, the time node when the turbidity reaches the maximum value represents that the heavy metal ions in the wastewater just react completely. However, the data processing unit needs a certain amount of time to determine whether the turbidity continues to increase after reaching the peak value. Therefore, there is a deviation between the time node when it senses that the turbidity no longer increases and the time node when the turbidity first reaches the maximum value. Thus, an excessive amount of heavy metal scavenger has been added into the test box 4 when the delivery pipe 6 is closed, and there is still a small part of the remaining scavenger inside the test box 4 after the test. In order to utilize this part of the scavenger, the return pipe 8 can be controlled to open after the test, so that the wastewater and the residual scavenger in the test box 4 are discharged into the purification tank 1 together, which is also convenient for centralized treatment of the test wastewater.

[0053] As a preferred embodiment of the present invention, a water distribution ring 9 is arranged outside the inlet pipe 2; the water distribution ring 9 is designed as a hollow structure and is interconnected with the sampling pipe 5; the water distribution ring 9 is interconnected with the inlet pipe 2 through a group of branch pipes 10 evenly distributed in a circumferential direction. Since the composition distribution of the wastewater may also be different in the cross-sectional direction when it flows through the inside of the inlet pipe 2, with components having a larger density located at the bottom of the inlet pipe 2 and components having a smaller density located at the top of the inlet pipe 2, by setting the water distribution ring 9, the wastewater converges into the water distribution ring 9 through a plurality of circumferentially distributed branch pipes 10 during sampling and is mixed inside the water distribution ring 9, and then enters the test box 4 through the sampling pipe 5, further improving the test representativeness of the collected samples for the entire batch of wastewater.

[0054] As a preferred embodiment of the present invention, a group of partitions 11 are evenly distributed inside the test box 4; the partitions 11 evenly divide the inside of the test box 4 into a group of compartments 12; a group of sub-storage boxes are arranged inside the medicine box 3; different types of heavy metal scavengers are respectively stored inside the sub-storage boxes; the number of the sub-storage boxes, the conveying pipes 6, the reflux pipes 8, and the turbidity sensors 7 is the same as that of the compartments 12 and they correspond one by one; the sub-storage boxes and the conveying pipes 6 are communicated with each other respectively. Since the types of heavy metal ions in different wastewaters are different, and the treatment effects of different types of scavengers on different heavy metal ions are also different, the better the treatment effect, the higher the capture degree of heavy metals, the more flocculent precipitates are generated, and the higher the turbidity. Therefore, during the test of the present invention, by setting multiple sub-storage boxes and compartments 12, different types of heavy metal scavengers are added into different compartments 12 to conduct wastewater tests respectively. Then, the data processing unit is used to compare the turbidity inside different compartments 12, and determine the type of scavenger corresponding to the compartment 12 with the highest turbidity. This scavenger is the most suitable type for this batch of wastewater. When adding medicine to the purification tank 1 later, this scavenger can be used to improve the removal efficiency of heavy metal ions.

[0055] A chute 13 is arranged inside the partition 11; a guide groove 14 is arranged at the corresponding position of the top of the partition 11 with respect to the chute 13; a plugging piece 15 is slidably connected inside the chute 13; a floating block 16 is slidably connected inside the guide groove 14, and the floating block 16 is fixedly connected with the plugging piece 15; a connecting hole 17 is arranged at the bottom of the partition 11; a through groove 18 is arranged at the corresponding position of the bottom of the plugging piece 15 with respect to the connecting hole 17. When the sampling pipe 5 injects wastewater into the test box 4, the connecting hole 17 and the through groove 18 are aligned with each other and in a conducting state, so the wastewater can flow between multiple compartments 12 through the connecting hole 17, making the wastewater samples fill the inside of different compartments 12. As the water surface gradually rises, it drives the plugging piece 15 to float upward through the floating block 16. When the water surface and the floating block 16 reach the top of the partition 11, the through groove 18 of the plugging piece 15 and the connecting hole 17 of the partition 11 are misaligned with each other, making the connecting hole 17 in a closed state. At this time, the wastewaters between different partitions 11 are completely isolated, which is convenient for injecting different heavy metal scavengers into different compartments 12 and conducting wastewater tests respectively, and preventing the wastewaters or scavengers between the compartments 12 from interfering and affecting each other during the test, resulting in the failure of the test.

[0056] As a preferred embodiment of the present invention, a rotating shaft 19 is rotatably connected inside the test box 4; the rotating shaft 19 is driven by a motor 20; a set of paddles 21 are fixedly connected to the rotating shaft 19 at positions corresponding to each compartment 12. After injecting the heavy metal scavenger into the wastewater inside the test box 4, the motor 20 drives the rotating shaft 19 to rotate, and multiple sets of paddles 21 rotate and stir inside different compartments 12 respectively, promoting the uniform mixing between the wastewater and the scavenger, enabling the full chelation reaction between the scavenger and the heavy metal, and further improving the test efficiency and accuracy.

[0057] As a preferred embodiment of the present invention, an arc-shaped piece 22 is fixedly connected to the end of the paddle 21 away from the rotating shaft 19; an elastic friction pad 23 is fixedly connected to the outside of the arc-shaped piece 22. During the rotation of the paddle 21, it can drive the arc-shaped piece 22 and the elastic friction pad 23 to rotate synchronously. When the elastic friction pad 23 moves to one side of the turbidity sensor 7, it can friction and scrape on its detection end face, thereby removing the residues such as flocs and impurities adhered to its surface, preventing it from being blocked by dirt, and improving the accuracy and sensitivity of the turbidity sensor 7.

[0058] The elastic friction pad 23 is designed as a hollow structure, and a water-absorbing member 24 is fixedly connected inside it. The material of the water-absorbing member 24 can be an elastic porous material, such as sponge, foam, porous silicon material, etc.; a set of guide holes 25 are evenly distributed on the outside of the elastic friction pad 23. When the elastic friction pad 23 is pressed against the detection end of the turbidity sensor 7, the water-absorbing member 24 inside the elastic friction pad 23 is subjected to a pressing force and squeezes out the water inside it through the guide holes 25 to wash the detection surface of the turbidity sensor 7, further improving the cleaning efficiency of the dirt. After the elastic friction pad 23 is separated from the turbidity sensor 7, the water-absorbing member 24 absorbs water from the wastewater again through the guide holes 25.

[0059] As shown in Figure 8 A method for adding medicine to heavy metal scavenger wastewater treatment according to the present invention, which uses the above-mentioned device for adding medicine to heavy metal scavenger wastewater treatment, includes the following steps:

[0060] S1. Sampling stage: The wastewater is discharged into the purification tank 1 through the water inlet pipe 2. During the drainage process, the sampling pipe 5 is controlled to be opened, and the wastewater is introduced into the test box 4. The flowmeter is used to quantitatively control the amount of sampled wastewater.

[0061] S2. Data recording stage: The conveying pipe 6 is controlled to be opened, and the heavy metal scavenger inside the medicine box 3 enters the test box 4 to mix and react with the wastewater sample, generating flocculent precipitation. The flowmeter is used to obtain the addition amount of the scavenger in real time, the turbidity sensor 7 is used to measure the turbidity in real time, and the data is recorded through the data processing unit.

[0062] S3. Data analysis stage: When the data processing unit senses that the turbidity no longer increases, the control unit controls the delivery pipe 6 to close. Then, the data processing unit determines the time node when the turbidity first reaches its peak and obtains the dosage of the trapping agent corresponding to this time node, which is the test dosage for this test.

[0063] S4. Dosage calculation stage: The data processing unit calculates the actual dosage of the heavy metal trapping agent that needs to be added to the purification tank 1 by combining the test dosage, the test wastewater volume, and the wastewater volume in the purification tank 1.

[0064] S5. Chemical addition treatment stage: The chemical addition component controls the heavy metal trapping agent inside the medicine box 3 to be input into the purification tank 1 at the corresponding dosage for wastewater treatment work.

[0065] S6. Recycling stage: The control unit opens the return pipe 8 to discharge the wastewater and the remaining trapping agent in the test box 4 into the purification tank 1 together.

[0066] The above front, back, left, right, up, and down are all based on the Figure 1 in the attached drawings of the specification. Taking the observer's perspective as the standard, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0067] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the protection scope of the present invention.

[0068] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates 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 the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A dosing device for treating heavy metal capturer wastewater, comprising: A purification tank for treating wastewater containing heavy metal ions; An inlet pipe is connected to one side of the purification tank; A medicine box is arranged on the top of the purification tank; The inside of the medicine box is used to store heavy metal capturer; A dosing component is arranged between the medicine box and the purification tank; the dosing component is used to control the addition of the heavy metal capturer inside the medicine box into the purification tank; It is characterized in that: it further includes an on-line test component; the on-line test component is used to sample and quantitatively test the wastewater before treatment to determine the actual addition amount of the heavy metal capturer; The on-line test component includes a data processing unit, a control unit and a test box fixedly connected to the outside of the purification tank; A sampling pipe is connected between the test box and the inlet pipe; a delivery pipe is connected between the test box and the medicine box; solenoid valves and flow meters are equipped on both the sampling pipe and the delivery pipe; a turbidity sensor is arranged inside the test box; A group of partition plates are evenly distributed inside the test box; the partition plates evenly divide the inside of the test box into a group of compartments; a group of sub-storage boxes are arranged inside the medicine box; the inside of the sub-storage boxes are respectively used to store different types of heavy metal capturers; the number of sub-storage boxes, delivery pipes, return pipes and turbidity sensors is the same as the number of compartments and they correspond one by one; the sub-storage boxes are respectively connected to the delivery pipes; A chute is arranged inside the partition plate; a guide groove is arranged at the corresponding position of the top of the partition plate with respect to the chute; a blocking piece is slidably connected inside the chute; a floating block is slidably connected inside the guide groove, and the floating block is fixedly connected to the blocking piece; a connecting hole is arranged at the bottom of the partition plate; a through groove is arranged at the corresponding position of the bottom of the blocking piece with respect to the connecting hole; A rotating shaft is rotatably connected inside the test box; the rotating shaft is driven by a motor; a group of paddle pieces are fixedly connected to the rotating shaft at the corresponding positions of each compartment; One end of the paddle piece away from the rotating shaft is fixedly connected with an arc-shaped piece; an elastic friction pad is fixedly connected to the outside of the arc-shaped piece; when the paddle piece rotates, it can drive the arc-shaped piece and the elastic friction pad to rotate synchronously, so that when the elastic friction pad moves to one side of the turbidity sensor, it can friction and scrape on its detection end face, thereby removing the flocs and impurity residues adhered to its surface; The elastic friction pad is designed as a hollow structure, and a water absorption piece is fixedly connected inside it, and the material of the water absorption piece is an elastic porous material; a group of guide holes are evenly distributed on the outside of the elastic friction pad; when the elastic friction pad is mutually extruded with the detection end of the turbidity sensor, the water absorption piece inside the elastic friction pad is under pressure and squeezes out the water inside it through the guide holes and flushes the detection surface of the turbidity sensor, and when the elastic friction pad is separated from the turbidity sensor, the water absorption piece re-absorbs water from the wastewater through the guide holes.

2. A dosing device for treating heavy metal capturer wastewater according to claim 1, characterized in that: A return pipe is connected between the test box and the purification tank; the return pipe is equipped with a solenoid valve.

3. A dosing device for treating heavy metal capturer wastewater according to claim 2, characterized in that: A water distribution ring is arranged on the outside of the inlet pipe; the water distribution ring is designed as a hollow structure and is connected to the sampling pipe; the water distribution ring and the inlet pipe are connected through a group of branch pipes evenly distributed in a circle.

4. A method for adding medicine to treat heavy metal capturer wastewater, which uses the heavy metal capturer wastewater treatment medicine adding device of claim 3, and is characterized in that: Including the following steps: S1. Sampling stage: Drain the wastewater into the purification tank through the inlet pipe. During the drainage process, control the opening of the sampling pipe to introduce the wastewater into the test box, and quantitatively control the amount of sampled wastewater by using the flow meter; S2. Data recording stage: Control the opening of the delivery pipe, so that the heavy metal scavenger inside the medicine box enters the test box and mixes with the wastewater sample for reaction to produce flocculent precipitation. Use a flow meter to obtain the addition amount of the scavenger in real time, use a turbidity sensor to measure the turbidity in real time, and record it through the data processing unit; S3. Data analysis stage: When the data processing unit senses that the turbidity no longer increases, the control unit controls the delivery pipe to close. Then the data processing unit determines the time node when the turbidity first reaches the peak value, and obtains the addition amount of the scavenger corresponding to this time node, which is the test addition amount for this test; S4. Dosage calculation stage: The data processing unit combines the test addition amount, the test wastewater volume, and the wastewater volume in the purification tank to calculate the actual addition dosage of the heavy metal scavenger that needs to be added to the purification tank.

5. A method for adding a heavy metal scavenger to wastewater treatment, according to claim 4, characterized in that: This method further includes the following steps: S5. Drug addition treatment stage: Control the heavy metal scavenger inside the medicine box to be input into the purification tank at the corresponding addition dosage through the drug addition component to carry out the wastewater treatment work; S6. Recycling stage: Control the reflux pipe to open, and discharge the wastewater and the remaining scavenger in the test box into the purification tank together.

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