An unpowered dosing system and method of dosing thereof

Abstract

This application belongs to the field of industrial wastewater resource treatment technology, and relates to a non-powered dosing system and its dosing method. The non-powered dosing system includes an injection module, a storage module, and a regulating module. The injection module is connected to the storage module and is used to inject the reagent into the storage module. The storage module is connected to the wastewater treatment tank and is positioned higher than the wastewater treatment tank, allowing the reagent to flow into the wastewater treatment tank by gravity. The regulating module includes a first valve, a second valve, and a third valve, used to regulate the air pressure, reagent flow rate, and wastewater flow rate in the reagent storage tank, respectively. This system utilizes liquid level differences to achieve gravity flow of the reagent, effectively reducing energy consumption and minimizing the need for easily damaged components such as pumps and motors, significantly reducing equipment failure rates and maintenance costs.

Description

Technical Field

[0001] This application relates to the field of industrial wastewater resource treatment technology, specifically to a non-powered dosing system and its dosing method. Background Technology

[0002] The semiconductor industry generates a large amount of process wastewater during production, which requires the addition of chemicals such as acids, alkalis, and flocculants for treatment to ensure that the effluent meets discharge standards. Currently, the dosing of chemicals for semiconductor wastewater treatment generally relies on electric dosing pumps or pneumatic drive systems, with the main methods being acid-alkali circulating dosing and point-to-point dosing of other chemicals.

[0003] Acid-base dosing typically employs a circulating mode, equipped with a single electric dosing pump and multiple pneumatic control valves, requiring continuous operation. Other chemicals are added point-to-point, with one electric dosing pump corresponding to each dosing point. Existing electric dosing methods have significant drawbacks: First, high energy consumption, with electric pumps continuously consuming electricity, resulting in high operating costs; second, high equipment failure rate, with pumps, motors, and other power components prone to wear and tear, leading to significant spare parts consumption and frequent failures that can interrupt dosing, affecting wastewater treatment stability; third, poor automation adaptability, making it difficult to dynamically adjust the dosing amount according to real-time wastewater flow, easily resulting in over-dosing or under-dosing, while manual intervention increases labor costs.

[0004] In summary, existing electric-driven dosing solutions suffer from drawbacks such as high energy consumption, high maintenance costs, and poor adaptability. Summary of the Invention

[0005] In view of the shortcomings of the prior art described above, the purpose of this application is to provide a non-powered dosing system and dosing method that can achieve gravity flow of the agent by relying on the liquid level difference, effectively reducing energy consumption, while reducing vulnerable parts such as pumps and motors, and significantly reducing equipment failure rate and operation and maintenance costs.

[0006] On the one hand, this application provides a non-powered dosing system, including an injection module, a storage module, and an adjustment module;

[0007] The injection module includes an injection pump, which is connected to the storage module and is used to inject the drug into the storage module;

[0008] The storage module includes a reagent storage tank, which is connected to a wastewater treatment pond. The reagent storage tank is positioned at a higher level than the wastewater treatment pond, so that the reagent flows into the wastewater treatment pond by gravity.

[0009] The regulating module includes a first valve, a second valve, and a third valve. The first valve is connected to the reagent storage tank and is used to regulate the air pressure inside the reagent storage tank. The second valve is located at the reagent inlet of the wastewater treatment tank and is used to regulate the flow rate of the reagent. The third valve is located at the wastewater inlet of the wastewater treatment tank and is used to regulate the flow rate of the wastewater.

[0010] In an optional embodiment, the storage module further includes a pure water bend, which is connected to the medicine storage tank and forms a water seal structure for depressurizing when the internal pressure of the medicine storage tank is overpressured and replenishing air when the internal pressure is negative.

[0011] In an optional embodiment, the regulating module further includes a fourth valve connected to the reagent storage tank and the second valve, for forcibly blocking the flow of the reagent into the wastewater treatment pool under special circumstances.

[0012] In an optional embodiment, a detection module is further included, which includes a first detection module, a second detection module, and a third detection module;

[0013] The first detection module is located at the drug outlet of the drug storage tank and is used to detect the liquid phase pressure at the drug outlet;

[0014] The second detection module is located between the third valve and the wastewater treatment tank, and is used to detect the flow rate of the wastewater;

[0015] The third detection module is installed inside the drug storage tank and is used to detect the liquid level of the drug inside the drug storage tank.

[0016] In an optional embodiment, a control module is further included. The control module is communicatively connected to the injection module, the adjustment module, and the detection module, and controls the working state of the injection module and the adjustment module according to the detection data of the detection module.

[0017] In an optional embodiment, the first valve is opened when the liquid phase pressure P at the drug outlet is ≤0.1MPa; and the first valve is closed when the liquid phase pressure P at the drug outlet is ≥0.2MPa.

[0018] In an optional embodiment, the second valve opens or closes synchronously with the third valve.

[0019] In an optional embodiment, the valve opening degree of the second valve is calculated using the following formula:

[0020] K = Q × L / C

[0021] Wherein, K is the valve opening degree of the second valve, Q is the wastewater flow rate per unit time, L is the reagent requirement per unit wastewater, and C is the conversion factor for the opening degree of the second valve.

[0022] In an optional embodiment, the effective height of the pharmaceutical storage tank is 4m. When the liquid level of the pharmaceutical agent H ≤ 1m, the injection pump is started; when the liquid level of the pharmaceutical agent H ≥ 4m, the injection pump is turned off.

[0023] On the other hand, this application provides a non-powered dosing method, applied to the non-powered dosing system described in any of the foregoing embodiments, comprising the following steps:

[0024] Provide non-powered dosing systems;

[0025] Start the injection pump to inject the medicine into the medicine storage tank;

[0026] Open the third valve to allow the wastewater to flow into the wastewater treatment tank, and simultaneously open the second valve to allow the reagent to flow into the wastewater treatment tank by gravity.

[0027] Open the first valve to adjust the gas pressure in the medicine storage tank to always be within the preset range.

[0028] As described above, compared with the prior art, the non-powered dosing system and dosing method provided in this application have at least the following beneficial effects:

[0029] The non-powered dosing system provided in this application relies on the liquid level difference to achieve gravity flow of the reagent, effectively reducing energy consumption. At the same time, it reduces vulnerable parts such as pumps and motors, significantly lowering equipment failure rate and maintenance costs. The system is equipped with adjustment, detection, and control modules to achieve adaptive adjustment of the dosing amount, ensuring high dosing accuracy, avoiding reagent waste or underdosing, and stabilizing wastewater treatment results. Combined with a pure water bend water seal structure, it can stabilize pipeline reagent pressure, ensure uniform reagent flow, and realize overpressure relief and negative pressure gas replenishment, comprehensively ensuring the safe operation of the storage tank.

[0030] The non-powered dosing method of this application uses the above-mentioned non-powered dosing system to add chemicals to wastewater, and therefore also has the above-mentioned beneficial effects. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 The diagram shown is a structural schematic of a non-powered dosing system provided in Embodiment 1 of this application.

[0033] Figure 2 The diagram shown is a flowchart of a non-powered dosing method provided in Embodiment 2 of this application.

[0034] In the diagram: 11. Injection pump; 21. Chemical storage tank; 22. Pure water bend; 31. First valve; 32. Second valve; 33. Third valve; 34. Fourth valve; 41. First detection module; 42. Second detection module; 43. Third detection module; 5. Control module; 02. Wastewater treatment tank. Detailed Implementation

[0035] To make the technical objectives, technical solutions, and technical effects of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with embodiments. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this application, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, for example, referring to both fixed connections and detachable connections. Furthermore, the descriptions using terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples" indicate that a specific feature, structure, material, or characteristic described in connection with an implementation or example is included in at least one implementation or example of this application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same implementation or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more implementations or examples.

[0039] Example 1

[0040] To address the problems of high energy consumption, high operation and maintenance costs, and poor adaptability in the existing technologies described above, this embodiment provides a non-powered dosing system, referring to... Figure 1 The system includes an injection module 1, a storage module 2, and an adjustment module 3;

[0041] The injection module 1 includes an injection pump 11, which is connected to the storage module 2 and is used to inject the medicine into the storage module 2.

[0042] The storage module 2 includes a reagent storage tank 21, which is connected to the wastewater treatment tank 02. The position of the reagent storage tank 21 is higher than that of the wastewater treatment tank 02, so that the reagent flows into the wastewater treatment tank 02 by gravity.

[0043] The regulating module 3 includes a first valve 31, a second valve 32, and a third valve 33. The first valve 31 is connected to the reagent storage tank 21 and is used to regulate the air pressure inside the reagent storage tank 21. The second valve 32 is located at the reagent inlet of the wastewater treatment tank 02 and is used to regulate the flow rate of the reagent. The third valve 33 is located at the wastewater inlet of the wastewater treatment tank 02 and is used to regulate the flow rate of the wastewater.

[0044] In practical applications, the position height of the chemical storage tank 21 is higher than that of the wastewater treatment tank 02. The chemical can flow by gravity due to the liquid level difference, which effectively reduces energy consumption. At the same time, it reduces vulnerable parts such as pumps and motors, resulting in a significant decrease in equipment failure rate and operation and maintenance costs.

[0045] In this embodiment, the storage module 2 further includes a pure water bend 22, which is connected to the drug storage tank 21 and forms a water seal structure. This water bend is used to release pressure when the internal pressure of the drug storage tank 21 is too high and to introduce air when it is too low. Specifically, one end of the pure water bend 22 is connected to the gas phase region at the top of the drug storage tank 21, and the other end is open to the atmosphere. The U-shaped bend in the middle forms a water seal structure.

[0046] During system operation, when the pressure inside the drug storage tank 21 is normal, the water seal structure prevents gas leakage, thus preventing harmful gases from escaping directly and preventing external impurities from entering the tank. The pressure in the drug storage tank 21 is regulated by the first valve 31 in the regulating module 3. However, in special circumstances such as damage to the first valve 31, if the pressure in the drug storage tank 21 becomes too high, the gas in the drug storage tank 21 will bubble out from the water seal structure, thereby protecting the drug storage tank 21 from overpressure. When the pressure in the drug storage tank 21 is too low, i.e., negative pressure, outside air enters the drug storage tank 21 through the water seal structure, thus preventing the tank from being sucked down.

[0047] In this embodiment, the regulating module 3 also includes a fourth valve 34, which is connected to the chemical storage tank 21 and the second valve 32. This fourth valve is used to forcibly block the flow of chemicals into the wastewater treatment tank 02 under special circumstances. Specifically, during normal system operation, the fourth valve 34 is always fully open. However, in special circumstances, such as equipment maintenance, tank replacement, or emergency chemical interruption, the fourth valve 34 can be manually closed to isolate all downstream equipment of the chemical storage tank 21, thereby achieving safe maintenance.

[0048] In this embodiment, the non-powered dosing system further includes a detection module 4, which includes a first detection module 41, a second detection module 42, and a third detection module 43. The first detection module 41 is located at the reagent outlet of the reagent storage tank 21 and is used to detect the liquid phase pressure at the reagent outlet. The second detection module 42 is located between the third valve 33 and the wastewater treatment tank 02 and is used to detect the flow rate of the wastewater. The third detection module 43 is located inside the reagent storage tank 21 and is used to detect the liquid level of the reagent inside the reagent storage tank 21.

[0049] Specifically, the first detection module 41 can be any one of an electric contact pressure gauge, a pressure transmitter, or other suitable pressure detection device to realize the liquid phase pressure at the outlet of the pharmaceutical storage tank 21. Preferably, the first detection module 41 is an electric contact pressure gauge, which has both pressure display and threshold linkage output functions, and can directly control the opening and closing of the first valve 31 according to the set pressure range. It has a simple structure, reliable operation, and convenient operation and maintenance.

[0050] The second detection module 42 can be any of an electromagnetic flowmeter, turbine flowmeter, vortex flowmeter, or other suitable flow detection device to achieve accurate measurement of wastewater flow in wastewater treatment tank 02. Preferably, the second detection module 42 is an electromagnetic flowmeter. Electromagnetic flowmeters have no moving mechanical parts, are resistant to media interference, are not easily clogged, and can output flow electrical signals in real time, providing accurate data for valve opening calculation and adjustment. They are stable in operation and easy to maintain.

[0051] The third detection module 43 can be any of a float level gauge, radar level gauge, hydrostatic level transmitter, or other suitable level detection device to achieve accurate measurement of the liquid level in the pharmaceutical storage tank 21. Preferably, the third detection module 43 is a float level gauge, which has a simple structure, low cost, strong resistance to pharmaceutical corrosion, and can directly output a switch signal to match the start and stop control of the injection pump 11. It is easy to install and maintain, fully adapts to the liquid level linkage replenishment requirements of this system, and has the strongest field applicability.

[0052] In this embodiment, the non-powered dosing system also includes a control module 5, which is communicatively connected to the injection module 1, the adjustment module 3 and the detection module 4, and controls the working state of the injection module 1 and the adjustment module 3 according to the detection data of the detection module 4.

[0053] Specifically, the control module 5 automatically controls the opening or closing of the first valve 31 based on the liquid phase pressure at the drug outlet detected by the first detection module 41. For example, when the detected liquid phase pressure P at the drug outlet is ≤0.1MPa, the control module 5 controls the first valve 31 to open to replenish gas into the drug storage tank 21, thereby increasing the gas pressure inside the tank and promoting the smooth flow of the drug; when the detected liquid phase pressure P at the drug outlet is ≥0.2MPa, the first valve 31 closes to stop replenishing gas, in order to avoid excessive pressure inside the drug storage tank 21.

[0054] In this embodiment, compressed dry air is selected as the replenishing medium for connecting the first valve 31. The compressed dry air has been dried and has extremely low water content, so it will not dilute the medicine or change the concentration of the medicine, and it can also prevent the inner wall of the tank, pipelines and valves from getting damp and rusted. After being filtered to remove impurities, it is free of dust, oil droplets and other impurities, so it will not contaminate the medicine. Moreover, the compressed dry air does not react chemically with various water treatment agents, has a wide range of applications, and has no risk of combustion, explosion or corrosion.

[0055] In this embodiment, the second valve 32 and the third valve 33 are designed to open or close synchronously. Specifically, while the control module 5 controls the third valve 33 to open, it also opens the second valve 32. Based on the wastewater flow rate detected by the second detection module 42, the control module 5 calculates and controls the valve opening of the second valve 32 to achieve control of the reagent flow rate.

[0056] This design allows for the addition of chemicals only when water is available and to be stopped when water is scarce. The chemical dosing is completely synchronized with the water treatment process, effectively eliminating the problem of continuous chemical addition after wastewater treatment is stopped. This reduces unnecessary chemical consumption and lowers operating costs, while also preventing chemicals from accumulating in the tank and avoiding water quality abnormalities. At the same time, the chemical dosing is done on demand throughout the process, with the dosage matching the wastewater flow rate, effectively ensuring stable wastewater treatment results and avoiding the risk of effluent exceeding standards due to improper timing of chemical dosing.

[0057] Specifically, the valve opening degree of the second valve 32 is calculated using the following formula:

[0058] K = Q × L / C

[0059] Where K is the valve opening degree of the second valve 32, Q is the wastewater flow rate per unit time, L is the reagent requirement per unit of wastewater, and C is the opening degree conversion factor of the second valve 32. For example, if the second detection module 42 detects a wastewater flow rate Q of 90 tons / hour in the wastewater treatment tank 02, and the required reagent dosage L per ton of wastewater is 2 liters / ton based on the wastewater quality, and the second valve 32 has a total of 10 opening intervals with an opening degree conversion factor C of 45, then substituting the data into the formula, we can calculate that the valve opening degree of the second valve 32 is 4 intervals. That is, when the second valve 32 is open by 4 intervals, the reagent flowing out per hour is just enough to meet the wastewater treatment requirements.

[0060] In this embodiment, the control module 5 controls the operation of the injection pump 11 based on the liquid level height of the medicine in the medicine storage tank 21 detected by the third detection module 43. Specifically, when the liquid level of the medicine in the medicine storage tank 21 is detected to be too low, the control module 5 controls the injection pump 11 to start, injecting medicine into the medicine storage tank 21 to raise the liquid level and ensure stable gravity flow pressure and uniform dosing; when the liquid level of the medicine in the medicine storage tank 21 is detected to be too high, the control module 5 controls the injection pump 11 to stop running to prevent medicine leakage. For example, if the effective height of the medicine storage tank 21 is 4m, when the liquid level height H ≤ 1m, the control module 5 controls the injection pump 11 to start; when the liquid level height H ≥ 4m, the control module 5 controls the injection pump 11 to shut down.

[0061] Example 2

[0062] This embodiment provides a non-powered dosing method, applied to the non-powered dosing system described in any one of Embodiment 1, referring to... Figure 2 The non-powered dosing method provided in this embodiment includes the following steps:

[0063] First, a non-powered dosing system is provided. Specifically, any non-powered dosing system from Example 1 can be selected, and its structure and related settings have been described in Example 1, so they will not be repeated here.

[0064] Next, the injection pump 11 is started to inject the medicine into the medicine storage tank 21. In this embodiment, the control module 5 controls the injection pump 11 to start, and the third detection module 43 detects the liquid level of the medicine in the medicine storage tank 21. The control module 5 receives the detection data from the third detection module 43. When the liquid level of the medicine reaches the preset high liquid level limit, the control module 5 controls the injection pump 11 to stop running to prevent the medicine from overflowing.

[0065] During system operation, the control module 5 receives the liquid level data detected by the third detection module 43 in real time. When the liquid level of the agent is lower than the preset low liquid level limit, the control module 5 controls the injection pump 11 to start running to inject the agent into the agent storage tank 21, raise the liquid level of the agent, and ensure stable gravity flow pressure and uniform drug addition.

[0066] The preset range of the liquid level can be designed according to actual conditions and needs, and is not specifically limited here. For example, if the effective height of the liquid level tank 21 is 4m, when the liquid level H ≤ 1m, the control module 5 controls the injection pump 11 to start; when the liquid level H ≥ 4m, the control module 5 controls the injection pump 11 to shut down.

[0067] Next, the third valve 33 is opened to allow wastewater to flow into the wastewater treatment tank 02, and the second valve 32 is opened simultaneously to allow the reagent to flow into the wastewater treatment tank 02 by gravity. In this embodiment, the control module 5 controls the third valve 33 and the second valve 32 to open synchronously, and calculates and adjusts the valve opening of the second valve 32 based on the wastewater flow rate detected by the second detection module 42, thereby controlling the reagent flow rate. Specifically, the valve opening of the second valve 32 is calculated using the following formula:

[0068] K = Q × L / C

[0069] Where K is the valve opening degree of the second valve 32, Q is the wastewater flow rate per unit time, L is the reagent requirement per unit of wastewater, and C is the opening degree conversion factor of the second valve 32. For example, if the second detection module 42 detects a wastewater flow rate Q of 90 tons / hour in the wastewater treatment tank 02, and the required reagent dosage L per ton of wastewater is 2 liters / ton based on the wastewater quality, and the second valve 32 has a total of 10 opening intervals with an opening degree conversion factor C of 45, then substituting the data into the formula, we can calculate that the valve opening degree of the second valve 32 is 4 intervals. That is, when the second valve 32 is open by 4 intervals, the reagent flowing out per hour is just enough to meet the wastewater treatment requirements.

[0070] When the third valve 33 is closed, the control module 5 simultaneously controls the second valve 32 to close. The synchronous start-stop design of the second valve 32 and the third valve 33 allows for the addition of chemicals only when water is available and stops only when water is scarce. This ensures complete synchronization between chemical dosing and the water treatment process, effectively preventing the need for continuous chemical addition after wastewater treatment is stopped. This reduces unnecessary chemical consumption and lowers operating costs, while also preventing chemical accumulation in the tank and avoiding water quality abnormalities. Furthermore, the on-demand dosing throughout the process, matching the chemical dosage to the wastewater flow rate, effectively ensures stable wastewater treatment results and avoids the risk of effluent exceeding standards due to improper chemical dosing timing.

[0071] Next, the first valve 31 is opened to regulate the gas pressure in the drug storage tank 21 to always remain within a preset range. In this embodiment, the preset range of gas pressure in the drug storage tank 21 is 0.1MPa < P < 0.2MPa. The control module 5 automatically controls the opening or closing of the first valve 31 based on the liquid phase pressure at the drug outlet detected by the first detection module 41. Specifically, when the detected liquid phase pressure at the drug outlet P ≤ 0.1MPa, the control module 5 controls the first valve 31 to open to replenish gas into the drug storage tank 21, increasing the gas pressure inside the tank and driving the drug to flow out smoothly; when the detected liquid phase pressure at the drug outlet P ≥ 0.2MPa, the first valve 31 closes to stop replenishing gas, in order to avoid excessive pressure inside the drug storage tank 21.

[0072] The above description is only a partial preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A non-powered dosing system, characterized in that, It includes an injection module, a storage module, and a regulation module; The injection module includes an injection pump, which is connected to the storage module and is used to inject the drug into the storage module; The storage module includes a reagent storage tank, which is connected to a wastewater treatment pond. The reagent storage tank is positioned at a higher level than the wastewater treatment pond, so that the reagent flows into the wastewater treatment pond by gravity. The regulating module includes a first valve, a second valve, and a third valve. The first valve is connected to the medicine storage tank and is used to regulate the gas pressure inside the medicine storage tank. The second valve is installed at the chemical inlet of the wastewater treatment tank and is used to regulate the flow rate of the chemical. The third valve is installed at the wastewater inlet of the wastewater treatment tank and is used to regulate the flow rate of the wastewater.

2. The non-powered dosing system according to claim 1, characterized in that, The storage module also includes a pure water bend, which is connected to the medicine storage tank and forms a water seal structure, used to release pressure when the internal pressure of the medicine storage tank is too high and to replenish air when it is too low.

3. The non-powered dosing system according to claim 1, characterized in that, The regulating module also includes a fourth valve, which is connected to the reagent storage tank and the second valve, and is used to forcibly block the flow of the reagent into the wastewater treatment pool under special circumstances.

4. The non-powered dosing system according to claim 1, characterized in that, It also includes a detection module, which comprises a first detection module, a second detection module, and a third detection module; The first detection module is located at the drug outlet of the drug storage tank and is used to detect the liquid phase pressure at the drug outlet; The second detection module is located between the third valve and the wastewater treatment tank, and is used to detect the flow rate of the wastewater; The third detection module is installed inside the drug storage tank and is used to detect the liquid level of the drug inside the drug storage tank.

5. The non-powered dosing system according to claim 4, characterized in that, It also includes a control module, which is communicatively connected to the injection module, the adjustment module and the detection module, and controls the working state of the injection module and the adjustment module according to the detection data of the detection module.

6. The non-powered dosing system according to claim 5, characterized in that, When the liquid phase pressure P at the drug outlet is ≤ 0.1 MPa, the first valve opens; when the liquid phase pressure P at the drug outlet is ≥ 0.2 MPa, the first valve closes.

7. The non-powered dosing system according to claim 5, characterized in that, The second valve opens or closes synchronously with the third valve.

8. The non-powered dosing system according to claim 5, characterized in that, The valve opening degree of the second valve is calculated using the following formula: K = Q × L / C Wherein, K is the valve opening degree of the second valve, Q is the wastewater flow rate per unit time, L is the reagent requirement per unit wastewater, and C is the conversion factor for the opening degree of the second valve.

9. The non-powered dosing system according to claim 5, characterized in that, The effective height of the pharmaceutical storage tank is 4m. When the liquid level of the pharmaceutical agent is H≤1m, the injection pump is started; when the liquid level of the pharmaceutical agent is H≥4m, the injection pump is turned off.

10. A non-powered dosing method, applied to the non-powered dosing system according to any one of claims 1 to 9, characterized in that, Includes the following steps: Provide non-powered dosing systems; Start the injection pump to inject the medicine into the medicine storage tank; Open the third valve to allow the wastewater to flow into the wastewater treatment tank, and simultaneously open the second valve to allow the reagent to flow into the wastewater treatment tank by gravity. Open the first valve to adjust the gas pressure in the medicine storage tank to always be within the preset range.

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