Dosing device

Abstract

This application discloses a dosing device, relating to the field of wastewater treatment technology. The device includes: a housing; a first injection device connected to the housing; a second injection device connected to the housing; and a partition disposed inside the housing. This application, by incorporating a liftable partition within the housing, allows for flexible switching between PAM cationic powder dissolution mode and PAM cationic emulsion direct dosing mode. In powder mode, all units remain connected for normal dissolution and maturation; in emulsion mode, the emulsion can be directly injected, enabling flexible switching between two dosing modes within the same device. By integrating emulsion injection and powder dissolution dosing functions, a highly integrated structure is formed, significantly saving equipment space, making it particularly suitable for the retrofitting of wastewater treatment plants with limited space. This application can be modularly upgraded based on existing powder dosing devices, resulting in low retrofitting costs and significant economic and engineering practicality.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a dosing device. Background Technology

[0002] In urban wastewater treatment, a large amount of sludge with high water content is generated. To facilitate subsequent transportation and treatment, the water content of the sludge needs to be significantly reduced through dewatering processes. Before sludge dewatering equipment such as belt conveyors and screw presses, a chemical flocculant called cationic polyacrylamide (PAM) is usually added. The main function of this agent is to cause the fine particles in the sludge to aggregate into larger flocs, making it easier to release water during subsequent mechanical extrusion, ultimately forming a sludge cake with low water content. Currently, wastewater treatment plants commonly use solid powdered cationic PAM as a flocculant. This powder needs to be mixed and dissolved with water before use, and then thoroughly stirred and matured to form a solution of a certain concentration before being added to the sludge for mixing via a metering pump.

[0003] However, existing technologies primarily rely on single-mode powdered PAM dosing devices, which present significant problems in practical applications. In winter or low-temperature environments, the dissolution rate and effectiveness of powdered PAM decrease significantly, leading to insufficient maturation of the prepared solution. This results in poor sludge dewatering, ultimately producing sludge cakes with high moisture content, increasing the difficulty and cost of subsequent treatment. To address the dewatering difficulties in winter, some wastewater treatment plants temporarily switch to more expensive but more effective cationic PAM emulsions as alternative flocculants. However, existing powdered dosing devices have fixed, interconnected internal chambers, making it impossible to disconnect the dissolution unit from subsequent units, thus incompatible with the direct addition of liquid PAM cationic emulsions. If cationic PAM emulsions are required, a separate, temporary emulsion storage, transportation, and dosing system is needed, including storage tanks, dosing pumps, and pipelines. This temporary system not only cannot operate routinely and occupies limited space, but its installation and commissioning are also cumbersome and costly, significantly impacting production efficiency and responsiveness to seasonal changes. Therefore, there is an urgent need to develop an integrated dosing device that can conveniently and reliably switch between powder and emulsion forms of PAM agents within the same set of equipment, so as to ensure the stability of sludge dewatering effect throughout the year, while avoiding additional land occupation and complex engineering modifications. Utility Model Content

[0004] The present invention introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This part of the present invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0005] This utility model aims to solve at least one of the technical problems existing in the prior art or related technologies.

[0006] In view of this, embodiments of this application propose a dosing device, comprising: Box; A liftable partition is provided inside the box to divide the interior of the box into a first space and a second space; A first injection device, the first injection device being connected to the first space; A second injection device, which is connected to the second space; The liftable partition is used to switch between a first working condition and a second working condition. When the liftable partition is in the first working condition, the first space and the second space are connected. When the liftable partition is in the second working condition, the first space and the second space are separated.

[0007] In one feasible implementation, the first space is used as a dissolution section.

[0008] In one feasible implementation, the dosing device further includes: A fixed baffle is disposed within the second space, dividing the second space into an interconnected ripening section and a storage section.

[0009] In one possible implementation, the curing section is located between the dissolving section and the storage section along the length of the container.

[0010] In one feasible implementation, the dosing device further includes: A stirring device, wherein there are multiple stirring devices, and the stirring device is provided in at least one of the dissolving section, the maturation section and the storage section.

[0011] In one feasible implementation, the first injection device includes: The chamber is located on the top of the box, and a discharge port is formed at the bottom of the chamber, which leads to the first space. The chamber is used to store powdered medicine.

[0012] In one feasible implementation, the first injection device includes: A drive unit, connected to the cabin, is used to control the opening or closing of the cabin.

[0013] In one feasible implementation, the second injection device includes: An injection tube for delivering an emulsion-like pharmaceutical agent; A first valve is provided on the injection pipe; The second valve is located on the injection pipe.

[0014] In one feasible implementation, the second injection device further includes: An expansion joint is provided on the injection pipe, and the expansion joint is located between the first valve and the second valve.

[0015] In one feasible implementation, the first valve is located close to the housing, and the first valve is a ball valve; The second valve is located away from the housing and serves as a check valve.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects: The dosing device provided in this application includes a housing, a liftable partition, a first injection device, and a second injection device. By installing a liftable partition within the housing, it is possible to flexibly switch between PAM cationic powder dissolution mode and PAM cationic emulsion direct dosing mode. In powder mode, all units remain connected to achieve normal dissolution and maturation; in emulsion mode, the emulsion can be directly injected, enabling flexible switching between the two dosing modes within the same device. By integrating the emulsion injection system with the original powder dissolution and dosing function, a highly integrated structure is formed, significantly saving equipment space, making it particularly suitable for the retrofitting of wastewater treatment plants with limited space. This application can be modularly upgraded based on existing powder dosing devices, resulting in low retrofitting costs and significant economic and engineering practicality.

[0017] The above description is merely an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this utility model more obvious and understandable, specific embodiments of this utility model are given below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 This is a schematic structural diagram of a dosing device according to one embodiment of this application.

[0019] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows: 1. Box body; 2. First injection device; 3. Second injection device; 4. Liftable partition; 5. Fixed baffle; 6. Stirring device. 101 First Space, 102 Second Space, 11 Dissolving Section, 12 Cooking Section, 13 Storage Section; 21. Cabin; 22. Drive components; 31 Injection pipe, 32 First valve, 33 Second valve, 34 Expansion joint. Detailed Implementation

[0020] The following description provides numerous specific details to offer a more thorough understanding of the technical solutions provided by this invention. However, it will be apparent to those skilled in the art that the technical solutions provided by this invention can be implemented without one or more of these details.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to the present invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0022] Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the present invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0023] like Figure 1 As shown in the figure, this application proposes a dosing device, including: a housing 1; a liftable partition 4, which is disposed inside the housing 1 to divide the interior of the housing 1 into a first space 101 and a second space 102; a first injection device 2, which is connected to the first space 101; and a second injection device 3, which is connected to the second space 102. The liftable partition 4 is used to switch between a first working condition and a second working condition. When the liftable partition 4 is in the first working condition, the first space 101 and the second space 102 are connected. When the liftable partition 4 is in the second working condition, the first space 101 and the second space 102 are separated.

[0024] The dosing device provided in this application embodiment switches between two operating modes via a liftable partition 4. In the first operating mode (PAM powder dissolution and dosing), the liftable partition 4 is lowered to its low position, connecting the first space 101 and the second space 102. PAM powder enters the first space 101 via the first injection device 2, and the powdered agent can be dissolved and mixed with water under stirring. The solution naturally overflows into the second space 102 for subsequent dosing. In the second operating mode (PAM emulsion direct dosing), the liftable partition 4 is raised to its high position, separating the two spaces. PAM emulsion is directly injected into the second space 102 via the second injection device 3 for subsequent dosing.

[0025] The dosing device provided in this application addresses the shortcomings of existing single powder dosing devices, enabling flexible switching between dual-agent modes. It uses emulsions to ensure dewatering effectiveness at low temperatures, eliminating the need for an additional independent system. The integrated structure combines dual injection functions and zoned treatment, significantly saving space and making it suitable for wastewater treatment plant retrofits with limited space. It can be modularly upgraded based on existing powder dosing devices, resulting in low retrofit costs and significant economic benefits. Furthermore, the adjustable baffle precisely controls space flow, dual valves prevent backflow and misoperation, and multiple stirring devices prevent reagent sedimentation, improving dosing accuracy and system reliability. This ensures stable sludge dewatering throughout the year, reducing subsequent disposal difficulties and costs, and demonstrating strong engineering practicality.

[0026] In one possible implementation, the first space 101 is used as a dissolution section 11.

[0027] In this technical solution, the first space 101 serves as the dissolving section 11. During the first operating condition, i.e., the powder feeding condition, the adjustable partition 4 is lowered to a low position, and the dissolving section 11 communicates with the second space. PAM powder is injected into the dissolving section 11 via the first injection device 2. Stirring allows the powder to fully mix and dissolve with water, facilitating the subsequent addition of reagents. As a core functional area, the dissolving section 11 provides a dedicated dissolving space for PAM powder during the powder feeding process. Combined with the stirring device, it ensures efficient powder dissolution and avoids insufficient dissolution at low temperatures.

[0028] like Figure 1 As shown, in one feasible embodiment, the dosing device further includes a fixed baffle 5, which is disposed in the second space 102 and divides the second space 102 into a maturation section 12 and a storage section 13 that are interconnected.

[0029] In this technical solution, the dosing device may further include a fixed baffle 5, which divides the second space 102 into a maturation section 12 and a storage section 13 that are interconnected. When the liftable baffle 4 is in the first working condition, that is, the powder dosing condition, the liftable baffle 4 is lowered to the low position, and the dissolving section 11 is connected to the maturation section 12. PAM powder enters the dissolving section 11 through the first injection device, dissolves under the action of the stirring device, overflows into the maturation section 12 for maturation, and then flows into the storage section 13 for temporary storage through the channel at the fixed baffle. When the liftable baffle 4 is in the first working condition, that is, the emulsion dosing condition, the liftable baffle 4 is raised to the high position to separate the dissolving section 11 and the maturation section 12. PAM emulsion is injected into the maturation section 12 through the second injection device, and after stirring, overflows through the fixed baffle 5 into the storage section 13. The flow rate can be controlled by valves and the pipeline stress can be buffered by expansion joints throughout the process. The dissolving section 11 provides a dedicated dissolving space for the powder, and with the help of stirring, ensures complete dissolution even at low temperatures, preventing insufficient powder dissolution from affecting the dewatering effect. Fixed baffles precisely divide the second space 102 into a maturation section 12 and a storage section 13, allowing the powder solution to complete maturation and storage in an orderly manner, while also enabling the emulsion to be directly temporarily stored in the storage section 13 via the maturation section 12 without additional modifications. The liftable partition 4 and the fixed baffle 5 work together to achieve flexible switching between dual-reagent modes without the need for an additional independent system, significantly saving space. The device can be modularly upgraded based on existing equipment, with low modification costs, adaptable to site-constrained wastewater treatment plants, ensuring stable sludge dewatering effects throughout the year, and reducing subsequent treatment costs and difficulties.

[0030] In some examples, the liftable partition adopts a liftable movable design, which is raised and lowered by a lifting mechanism such as hydraulic or electric means. It is installed between the melting section 11 and the curing section 12 inside the box 1, and its height or position can be adjusted as needed. The liftable partition is provided with a sealing structure around its perimeter, which can maintain close contact with the inner wall of the box 1 at all times during the lifting process, so as to achieve controllable communication or isolation between the melting section 11 and the curing section 12.

[0031] like Figure 1 As shown, in one feasible embodiment, the curing section 12 is located between the dissolving section 11 and the storage section 13 along the length of the tank 1. This arrangement allows the dissolved powder to overflow naturally into the curing section 12 along a straight path, reducing transport resistance and residue, and improving curing efficiency. The cured solution can quickly enter the adjacent storage section 13, shortening the process flow and avoiding reagent waste. This layout allows for efficient use of the internal space of the tank 1 along its length, without the need for additional lateral expansion, further saving equipment footprint and making it suitable for wastewater treatment plants with limited space. At the same time, this linear partitioning, in conjunction with the liftable partition 4 and the fixed baffle 5, enhances the smoothness of switching between dual reagent modes, ensures stable operation throughout the year, and reduces modification costs and subsequent disposal difficulties.

[0032] like Figure 1As shown, in one feasible embodiment, the dosing device further includes a stirring device 6, and there are multiple stirring devices 6, with at least one of the dissolving section 11, maturation section 12, and storage section 13 equipped with a stirring device 6. This arrangement allows the stirring devices 6 to be placed in the dissolving section 11, maturation section 12, and storage section 13 as needed. In the dissolving section, they promote thorough mixing of PAM powder and water, preventing uneven dissolution from affecting subsequent effects; in the maturation section 12, they help to achieve more uniform maturation of the solution; and in the storage section 13, they prevent the reagent from settling and stratifying. This ensures stable reagent status under both dosing modes, improves dosing accuracy, ensures sludge dewatering effect, reduces manual intervention, and enhances the reliability of the device operation.

[0033] In some examples, the stirring device 6 is equipped with a frequency converter-controlled screw pump, and a Y-type filter is installed at the pump inlet to pump the PAM cationic emulsion into the integrated PAM dosing device. The stirring device 6 ensures that the reagents in both operating mode 1 and operating mode 2 are uniformly mixed, preventing precipitation or stratification and improving reaction efficiency and consistency. The distribution of multiple stirrers makes the entire process more controllable, reduces manual intervention, and improves the level of automation.

[0034] like Figure 1 As shown, in one feasible embodiment, the first injection device 2 includes: a chamber 21, which is disposed on top of the housing 1, and a discharge port is formed at the bottom of the chamber 21, which leads to the first space 101. The chamber 21 is used to store powdered medicine. With this configuration, the chamber 21 is located on top of the housing 1 and the discharge port leads to the dissolving section 11 in the first space 101, providing a dedicated storage space for the powdered medicine. This prevents the powder from becoming damp and clumping or from being contaminated by external factors, ensuring the purity of the medicine. Its discharge port is directly connected to the dissolving section 11, enabling precise and rapid powder delivery, reducing powder loss and residue during transmission, and improving feeding efficiency.

[0035] In one feasible implementation, the first injection device 2 includes a drive component 22 connected to the chamber 21 for controlling the opening and closing of the chamber 21. This configuration, with the drive component 22 connected to the chamber 21 to control its opening and closing, allows for precise control of the timing and amount of powdered reagent feeding, avoiding overfeeding or underfeeding due to manual operation. This ensures accurate powder-to-water ratio entering the dissolving section 11, promoting uniform powder dissolution and preventing imbalances from affecting subsequent sludge dewatering. Simultaneously, automated control reduces manual intervention, lowers operational errors and labor intensity, and improves device operating efficiency. Furthermore, in the closed state, the chamber 21 is tightly sealed, preventing the powdered reagent inside from becoming damp and clumping, being contaminated externally, or experiencing powder leakage and loss, ensuring reagent purity and storage stability, and further enhancing the overall reliability and economy of the device.

[0036] like Figure 1As shown, in one feasible embodiment, the second injection device 3 includes: an injection tube 31 for conveying an emulsion-like agent; a first valve 32 disposed on the injection tube 31; and a second valve 33 disposed on the injection tube 31.

[0037] In this technical solution, the second injection device 3 includes an injection pipe 31, a first valve 32, and a second valve 33. When the device switches to emulsion dosing mode, the liftable baffle 4 can be raised to a high position to separate the dissolving section 11 from the maturation section 12. The emulsion-like agent is delivered through the injection pipe 31 of the second injection device 3. First, the first valve 32 on the injection pipe 31 is opened to control the on / off state and initial flow rate of the emulsion entering the injection pipe 31, thus precisely controlling the emulsion delivery rate. Finally, the emulsion is stably injected into the maturation section 12 through the injection pipe 31. After being temporarily stored in the maturation section 12, it flows into the storage section 13 through the fixed baffle channel, awaiting dosing. The injection pipe 31 provides a dedicated delivery channel for the emulsion, avoiding confusion with the delivery path of powdered agents and ensuring the purity of the emulsion. The first valve 32 and the second valve 33 work together to precisely adjust the emulsion feed rate and quantity, preventing fluctuations in the dehydration effect caused by excessive or insufficient emulsion, improving dosing accuracy, and preventing backflow of the emulsion.

[0038] In some examples, the injection pipe 31 is a DN40 PPR main inlet pipe with a wall thickness of 2mm, inserted vertically from the top flange of the curing section 12, extending 10cm below the liquid surface to prevent cavitation. The valve design allows for precise control of the PAM cationic emulsion injection process, flexibly adjusting the dosage according to the treatment effect, and improving operational safety. The dual valves provide backup protection, reducing the risk of leakage and ensuring reliable operation.

[0039] like Figure 1 As shown, in one feasible embodiment, the second injection device 3 further includes an expansion joint 34, which is disposed on the injection pipe 31 and between the first valve 32 and the second valve 33. This arrangement, with the expansion joint 34 on the injection pipe 31 and located between the first valve 32 and the second valve 33, effectively absorbs the expansion and contraction deformation of the injection pipe 31 caused by temperature changes (such as low temperatures in winter and high temperatures in summer) or pressure fluctuations. This prevents pipe rupture and leakage due to stress concentration, extends the service life of the injection pipe 31 and the valves, and ensures the sealing and stability of the emulsion delivery. Simultaneously, it can compensate for pipe installation errors, reduce the assembly difficulty of the connection between the injection pipe 31 and the valves and the curing section 12, and improve the overall ease of installation and maintenance of the device. Furthermore, this design eliminates the need for an additional pipe buffer structure, and in conjunction with the dual valves, enhances the reliability of the emulsion delivery system, helping the device operate stably in emulsion mode and adapting to the long-term operating requirements of wastewater treatment plants.

[0040] like Figure 1As shown, in one feasible embodiment, the first valve 32 is located close to the housing and is a ball valve; the second valve 33 is located away from the housing 1 and is a check valve. With this configuration, the first valve 32, being close to the housing 1 and a ball valve, allows for precise control of the emulsion's flow to the curing section 12. The ball valve opens and closes quickly and adjusts the flow rate flexibly, allowing for rapid adaptation of the emulsion dosage according to operating conditions, reducing emulsion retention in the pipe. The second valve 33, being away from the housing 1 and a check valve, effectively prevents emulsion backflow, avoiding backflow of already delivered emulsion into the injection pipe 31 or upstream storage tank, preventing pipeline contamination and reagent waste.

[0041] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0042] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit 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 utility model.

[0043] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0044] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A dosing device, characterized in that, include: Box (1); A liftable partition (4) is provided inside the box (1) to divide the interior of the box (1) into a first space (101) and a second space (102). A first injection device (2) is connected to the first space (101); The second injection device (3) is connected to the second space (102); The liftable partition (4) is used to switch between a first working condition and a second working condition. When the liftable partition (4) is in the first working condition, the first space (101) and the second space (102) are connected. When the liftable partition (4) is in the second working condition, the first space (101) and the second space (102) are separated.

2. The dosing device according to claim 1, characterized in that, The first space (101) is used as a dissolution section (11).

3. The dosing device according to claim 2, characterized in that, Also includes: A fixed baffle (5) is provided in the second space (102) to divide the second space (102) into a cooking section (12) and a storage section (13) that are interconnected.

4. The dosing device according to claim 3, characterized in that, Along the length of the box (1), the curing section (12) is located between the dissolving section (11) and the storage section (13).

5. The dosing device according to claim 3, characterized in that, Also includes: The stirring device (6) is a plurality of such stirring devices (6), and the stirring device (6) is provided in at least one of the dissolving section (11), the maturation section (12) and the storage section (13).

6. The dosing device according to any one of claims 1 to 5, characterized in that, The first injection device (2) includes: The chamber (21) is located on the top of the box (1), and a discharge port is formed at the bottom of the chamber (21). The discharge port is connected to the first space (101). The chamber (21) is used to store powdered medicine.

7. The dosing device according to claim 6, characterized in that, The first injection device (2) includes: A drive unit (22) is connected to the cabin (21) and is used to control the opening or closing of the cabin (21).

8. The dosing device according to claim 1, characterized in that, The second injection device (3) includes: An injection tube (31) is used to deliver an emulsion-like drug; The first valve (32) is provided on the injection pipe (31); The second valve (33) is located on the injection pipe (31).

9. The dosing device according to claim 8, characterized in that, The second injection device (3) further includes: The expansion joint (34) is provided on the injection pipe (31) and is located between the first valve (32) and the second valve (33).

10. The dosing device according to claim 9, characterized in that, The first valve (32) is located close to the housing (1), and the first valve (32) is a ball valve; The second valve (33) is located away from the housing (1) and is a check valve.

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