Multi-stage sedimentation tank

Abstract

The utility model discloses a multi-stage sedimentation tank and relates to the technical field of water treatment. The multi-stage sedimentation tank is used for settling and filtering chemical sewage and comprises a first sedimentation tank and a filtering piece; a first drainage hole and a second drainage hole are correspondingly formed in two opposite side walls of the first sedimentation tank; the filter part is arranged in the first sedimentation tank and comprises a first filter screen and a second filter screen; sewage flowing through the first drainage hole can penetrate through the first filter screen to enter the first sedimentation tank, and the sewage in the first sedimentation tank can overflow through the second filter screen along with increase and is discharged through the second drainage hole; according to the multi-stage sedimentation tank provided by the utility model, when sewage passes through the first sedimentation tank, the sewage is required to be filtered from entering the sedimentation tank and exiting the sedimentation tank, namely, the sewage is sequentially subjected to the treatment flows of filtering, sedimentation reaction and filtering, so that the sewage treatment effect can be greatly improved, and the probability of blocking a subsequent drainage pipeline is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a multi-stage sedimentation tank. Background Art

[0002] In the daily operations of chemical companies, laboratories, as core areas of scientific research and production, require the stable operation of their drainage systems. This system must not only demonstrate exceptional performance across multiple dimensions, including safety, effectiveness, adaptability, and compliance, but must also, with routine maintenance, ensure it continues to meet stringent functional requirements throughout its intended service life. Specifically, this requires the drainage system to ensure unobstructed pipes, zero leaks, and effectively resist chemical corrosion, maintaining a clean and safe laboratory environment.

[0003] Traditionally, drainage methods for laboratory workstations are mainly divided into two categories: direct discharge and discharge after buffering in a temporary storage tank. The direct discharge mode often uses rigid polyvinyl chloride (PVC) pipes with a diameter of Ф50, which are directly connected to the drainage pipes of the main drainage system for wastewater discharge. Although this method is simple and fast, given that chemical laboratory drainage often contains complex chemical reagents and raw material residues, when it is directly discharged into the main pipe, if the pipe slope (usually 3‰ to 5‰) is improperly designed or the water flow rate is insufficient, it is easy for sewage to be retained in the S-bend section of the pipe and in the main pipe. Over a long period of accumulation, the chemical substances in these sewage may react, causing corrosion to the inner wall of the pipe, and even causing blockage, seriously affecting drainage efficiency and safety.

[0004] Another traditional solution is to install an open temporary holding tank under the operating table, intending to reduce the burden on the drainage system through initial reaction and sedimentation. However, while this method can mitigate the direct impact of sewage on the pipes to a certain extent, the temporary holding tank lacks the necessary filtration devices, resulting in the sediment and untreated chemicals produced after the reaction still entering the drainage pipes with the water flow. These substances not only easily accumulate in the pipes and S-bends, forming difficult-to-remove blockages, but also their strong adhesion makes cleaning extremely difficult. In the long run, this may force the entire drainage system to be replaced, increasing maintenance costs and the risk of production interruption. Utility Model Content

[0005] In view of this, the purpose of the present invention is to overcome the deficiencies in the related art, and the present invention provides a multi-stage sedimentation tank.

[0006] The utility model provides the following technical solutions:

[0007] A multi-stage sedimentation tank is used for sedimentation and filtration of chemical wastewater, comprising a first sedimentation tank and a filter element.

[0008] A first drainage hole and a second drainage hole are correspondingly provided on the opposite side walls of the first sedimentation tank, and the setting position of the second drainage hole is lower than the position of the first drainage hole; the filter element is arranged in the first sedimentation tank, and the filter element includes a first filter screen and a second filter screen. The first filter screen is located on the side of the filter element close to the first drainage hole, and the second filter screen is located on the side of the filter element close to the second drainage hole. An anti-backflow part is provided between the first filter screen and the second filter screen.

[0009] The sewage flowing through the first drainage hole can pass through the first filter screen and enter the first sedimentation tank. As the sewage in the first sedimentation tank increases, it can overflow the second filter screen and be discharged through the second drainage hole. The backflow prevention part is used to prevent the sewage overflowing the second filter screen from flowing back to the side of the first filter screen close to the first drainage hole.

[0010] As a further improvement of the above technical solution, the diameter of the filter holes of the second filter screen is smaller than the diameter of the filter holes of the first filter screen.

[0011] As a further improvement of the above technical solution, the multi-stage sedimentation tank also includes a second sedimentation tank, which is connected to the first sedimentation tank through the first drainage hole. A water inlet pipe is provided on the side wall of the second sedimentation tank away from the first drainage hole, and the setting position of the water inlet pipe is higher than the setting position of the first drainage hole; a first overflow tank is provided in the second sedimentation tank, and the first overflow tank is surrounded by the outside of the first drainage hole, and the upper opening position of the first overflow tank is higher than the setting position of the water inlet pipe.

[0012] As a further improvement of the above technical solution, a filter basket is provided in the second sedimentation tank, the water inlet pipe is passed through the filter basket, and the upper opening position of the filter basket is higher than the upper opening position of the first overflow tank.

[0013] As a further improvement of the above technical solution, the multi-stage sedimentation tank further includes a third sedimentation tank, which is connected to the first sedimentation tank through the second drainage hole, and a drainage pipe is provided on the side wall of the third sedimentation tank.

[0014] As a further improvement of the above technical solution, the setting position of the drain pipe is lower than the setting position of the second drainage hole, and a second overflow pool is provided on the inner wall of the third sedimentation tank where the drain pipe is located. The second overflow pool is surrounded by the outside of the drain pipe, and the upper opening position of the second overflow pool is not lower than the setting position of the second drainage hole.

[0015] As a further improvement of the above technical solution, the first sedimentation tank, the second sedimentation tank and the third sedimentation tank are jointly arranged in a tank body, and the first sedimentation tank, the second sedimentation tank and the third sedimentation tank are respectively formed by fixing and plugging partition plates in the tank body.

[0016] As a further improvement of the above technical solution, the upper opening of the pool body is provided with a movable cover.

[0017] As a further improvement of the above technical solution, the filter element also includes an anti-backflow plate and a guide plate. The first filter screen and the second filter screen are both arranged at an angle. The lower end of the first filter screen abuts the inner wall of the first sedimentation tank where the first drainage hole is located, and the lower end of the first filter screen is lower than the setting position of the first drainage hole; the two ends of the anti-backflow plate are respectively connected to the higher end of the first filter screen and the lower end of the second filter screen, the higher end of the first filter screen is higher than the higher end of the second filter screen, and the anti-backflow plate is used to form an anti-backflow part; the higher end of the second filter screen is connected to one end of the guide plate, and the end of the guide plate away from the filter screen abuts the inner wall of the first sedimentation tank where the second drainage hole is located, and the end position of the guide plate abutting the inner wall of the first sedimentation tank is not higher than the setting position of the second drainage hole.

[0018] As a further improvement of the above technical solution, the filter element is integrally formed of a plate.

[0019] As a further improvement of the above technical solution, the opening area of ​​the first drainage hole is smaller than the opening area of ​​the second drainage hole.

[0020] As a further improvement of the above technical solution, filter plates are installed in the first drainage hole, the second drainage hole, the water inlet pipe, and the drainage pipe.

[0021] Compared with the related art, the beneficial effects of the present invention are:

[0022] The utility model provides a multi-stage sedimentation tank, which is designed to treat sewage efficiently and stably. The detailed operation process and advantages are described as follows.

[0023] During the sewage treatment process, the wastewater is first introduced into the primary sedimentation tank through the primary drain hole. Upon entering the tank, the wastewater immediately encounters the primary filter screen, the first filter. This screen effectively intercepts large particles of impurities in the wastewater, ensuring that only initially purified wastewater continues to fall to the bottom of the primary sedimentation tank.

[0024] At the bottom of the primary sedimentation tank, wastewater begins to accumulate, where it settles and undergoes a series of necessary chemical reactions. These processes are crucial for removing suspended solids, colloids, and dissolved organic matter from the wastewater, laying a solid foundation for subsequent water purification.

[0025] As more sewage continues to flow through the first drain hole into the primary sedimentation tank, the water level gradually rises. When the water level rises above the second filter, it indicates that the sewage has undergone initial sedimentation and chemical reactions. At this point, the upper layer of sewage, which has settled more completely and chemically reacted sufficiently, can easily pass through the second filter and overflow smoothly, entering the next stage of treatment. This step not only achieves secondary filtration of the sewage, but also ensures further improvement in water quality.

[0026] As the sewage level continues to rise in the first sedimentation tank, when the water level is higher than the second drain hole, this part of the sewage that has undergone two filtration and sedimentation reactions will be discharged smoothly through the second drain hole and directly enter the subsequent drainage pipe for more in-depth purification treatment or direct discharge.

[0027] It is worth mentioning that the sedimentation tank is also specially equipped with a backflow prevention part. This design cleverly prevents sewage overflowing the second filter from flowing back to the side of the first filter near the first drain hole, thereby avoiding possible pollution and efficiency loss.

[0028] In summary, during the treatment process of the above-mentioned multi-stage sedimentation tanks, sewage undergoes at least two filtration processes, as well as sedimentation and chemical reactions, from entering the first sedimentation tank to final discharge. This sophisticated treatment process, which sequentially filters sewage, undergoes sedimentation reactions, and then filters it again, not only significantly improves the overall sewage treatment effect but also greatly enhances sewage discharge efficiency. More importantly, it effectively reduces the risk of subsequent drainage pipe blockage caused by residual impurities, ensuring the stable operation of the sewage treatment system and the continued compliance of effluent water quality.

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1A schematic structural diagram of a multi-stage sedimentation tank in one embodiment of the present invention is shown;

[0032] Figure 2 A cross-sectional view of the structure of a multi-stage sedimentation tank in one embodiment of the present invention is shown from another perspective.

[0033] Description of main component symbols:

[0034] 100-first sedimentation tank; 110-first drain hole; 120-second drain hole; 200-filter element; 210-first filter screen; 220-second filter screen; 230-backflow prevention plate; 240-guide plate; 300-second sedimentation tank; 310-water inlet pipe; 320-filter basket; 330-first overflow tank; 400-third sedimentation tank; 410-drain pipe; 420-second overflow tank; 510-tank body; 520-movable cover; 530-partition plate. DETAILED DESCRIPTION

[0035] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0038] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] Combine Figure 1 、 Figure 2 As shown, this embodiment provides a multi-stage sedimentation tank for sedimentation and filtration of chemical wastewater, including a first sedimentation tank 100 and a filter element 200.

[0041] A first drainage hole 110 and a second drainage hole 120 are correspondingly provided on the opposite side walls of the first sedimentation tank 100, and the setting position of the second drainage hole 120 is lower than the position of the first drainage hole 110; the filter element 200 is arranged in the first sedimentation tank 100, and the filter element 200 includes a first filter screen 210 and a second filter screen 220. The first filter screen 210 is located on the side of the filter element 200 close to the first drainage hole 110, and the second filter screen 220 is located on the side of the filter element 200 close to the second drainage hole 120. A backflow prevention portion is provided between the first filter screen 210 and the second filter screen 220.

[0042] The sewage flowing through the first drainage hole 110 can pass through the first filter net 210 and enter the first sedimentation tank 100. As the sewage in the first sedimentation tank 100 increases, it can overflow the second filter net 220 and be discharged through the second drainage hole 120. The backflow prevention part is used to prevent the sewage overflowing the second filter net 220 from flowing back to the side of the first filter net 210 close to the first drainage hole 110.

[0043] In the multi-stage sedimentation tank provided in this embodiment, during the sewage treatment process, the sewage to be treated first flows through the first drain hole 110 and is introduced into the first sedimentation tank 100. Upon entering the sedimentation tank, the sewage immediately encounters the first filter screen 210, the first filtration barrier. The first filter screen 210 effectively intercepts large particles of impurities in the sewage, ensuring that only sewage that has undergone preliminary purification continues to fall to the bottom of the first sedimentation tank 100. At the bottom of the first sedimentation tank 100, the sewage begins to accumulate, where it settles and undergoes a series of necessary chemical reactions. These processes are crucial for removing suspended matter, colloids, and dissolved organic matter from the sewage, laying a solid foundation for subsequent water purification. As more sewage continues to flow into the first sedimentation tank 100 through the first drain hole 110, the water level within the tank gradually rises. When the water level rises above the second filter screen 220, it indicates that the sewage has undergone initial sedimentation and chemical reactions. At this point, the sewage in the upper layer, which has settled more completely and chemically reacted sufficiently, can easily pass through the second filter screen 220 and smoothly overflow, entering the next stage of treatment. This step not only achieves secondary filtration of the sewage but also ensures further improvement in water quality. As the sewage level in the first settling tank 100 continues to rise, when the water level exceeds the second drain hole 120, this portion of sewage, having undergone two rounds of filtration and sedimentation, will be smoothly discharged through the second drain hole 120 and directly into the subsequent drain pipe 410 for further purification or direct discharge.

[0044] It is worth mentioning that the sedimentation tank is also specially provided with a backflow prevention part. This design can effectively prevent the sewage overflowing the second filter screen 220 from flowing back to the side of the first filter screen 210 near the first drain hole 110, thereby avoiding possible pollution and efficiency loss.

[0045] In some specific embodiments, the pore diameter of the second filter 220 is smaller than the pore diameter of the first filter 210; such a design ensures that when sewage passes through the first filter 210 and the second filter 220 in sequence, the first filter 210 first filters out larger impurity particles, and then the second filter 220 further filters out finer impurities, thereby achieving a more detailed filtering effect.

[0046] In some specific embodiments, the structure of the multi-stage sedimentation tank has been further optimized and improved, and a second sedimentation tank 300 is also included. This second sedimentation tank 300 is connected to the first sedimentation tank 100 through the first drain hole 110, allowing water to flow smoothly between the two sedimentation tanks. In particular, an inlet pipe 310 is provided on the side wall of the second sedimentation tank 300 away from the first drain hole 110. The location of this inlet pipe 310 is deliberately arranged to be higher than the location of the first drain hole 110. The purpose of this is to ensure that the water can pass through a certain height difference before entering the second sedimentation tank 300, which helps to initially remove suspended matter and some sediment in the water.

[0047] In addition, a first overflow tank 330 is added inside the second sedimentation tank 300. This first overflow tank 330 is cleverly arranged outside the first drain hole 110, forming a relatively independent space. It is worth noting that the upper opening of the first overflow tank 330 is also designed to be higher than the location of the water inlet pipe 310. This layout not only ensures that the water has sufficient residence time during the sedimentation process to further remove impurities, but also prevents insufficiently settled water from flowing directly back to the first sedimentation tank 100 through the first drain hole 110, thereby greatly improving the overall filtration effect and sedimentation efficiency of the multi-stage sedimentation tank.

[0048] In some specific embodiments, to further enhance the filtration and sedimentation efficiency of the multi-stage sedimentation tank, a filter basket 320 is added to the second sedimentation tank 300. This filter basket 320 is cleverly designed to not only effectively intercept and collect larger impurities and particulate matter from the water flowing in through the water inlet pipe 310, but also ensure that the water becomes clearer and purer after passing through the filter basket 320. Specifically, the water inlet pipe 310 is cleverly threaded within the filter basket 320. Thus, when water enters the second sedimentation tank 300 through the water inlet pipe 310, it is first filtered by the filter basket 320, removing some impurities.

[0049] Furthermore, the upper opening of the filter basket 320 is intentionally designed to be higher than the upper opening of the first overflow tank 330. This layout not only helps ensure that water has sufficient space and time for further sedimentation and purification after passing through the filter basket 320, but also prevents unfiltered or incompletely settled water from flowing directly into the first overflow tank 330, thereby preventing possible impurities and particulate matter from affecting the first overflow tank 330 and subsequent treatment processes.

[0050] In some specific embodiments, the multi-stage sedimentation tank also includes a third sedimentation tank 400, which is connected to the first sedimentation tank 100 through the second drainage hole 120. A drainage pipe 410 is provided on the side wall of the third sedimentation tank 400 to facilitate further sedimentation treatment of the water discharged from the second drainage hole 120.

[0051] In some specific embodiments, to more precisely control the drainage and overflow processes of the multi-stage sedimentation tank, the drain pipe 410 is intentionally positioned lower than the second drain hole 120. This design helps ensure that during the sedimentation process, the water is able to remain and settle for a certain period of time, removing more impurities and particulate matter, before being discharged through the drain pipe 410. This not only improves sedimentation efficiency but also further enhances the quality of the discharged water.

[0052] At the same time, a second overflow tank 420 is specially provided on the inner wall of the third settling tank 400, at a position corresponding to the drain pipe 410. This second overflow tank 420 is cleverly arranged outside the drain pipe 410, forming a relatively independent space. It is worth noting that the upper opening of the second overflow tank 420 is intentionally designed to be no lower than the location of the second drain hole 120. This layout helps to automatically overflow through the second overflow tank 420 when the water flow exceeds a certain height during the sedimentation process, preventing excessive accumulation of water in the third settling tank 400, thereby ensuring the smooth progress of the entire sedimentation process.

[0053] In some specific embodiments, to optimize the structural layout of the multi-stage sedimentation tanks and improve space utilization, the first sedimentation tank 100, the second sedimentation tank 300, and the third sedimentation tank 400 are cleverly co-located within a single tank body 510. This design not only reduces floor space but also facilitates equipment installation, maintenance, and operation. To effectively separate and independently operate the three sedimentation tanks, separate partitions 530 are fixed and inserted within the tank body 510, meticulously demarcating the three independent sedimentation spaces to form the first sedimentation tank 100, the second sedimentation tank 300, and the third sedimentation tank 400, respectively.

[0054] These dividers 530 are not only durable and sturdy, capable of withstanding certain water impacts and pressures, but also provide excellent sealing properties, effectively preventing water from flowing across different sedimentation tanks and mixing impurities. Furthermore, the plug-in connection method of the dividers 530 allows for flexible adjustment based on actual needs, adapting to application scenarios of varying scales and processing capacities.

[0055] In some specific embodiments, to further enhance the functionality and practicality of the multi-stage sedimentation tank, a movable cover 520 is provided at the upper opening of the tank body 510. This movable cover 520 can be opened or closed according to actual needs, thereby enabling convenient observation and effective management of the sedimentation process within the tank body 510.

[0056] When it's time to inspect the sedimentation process within tank 510, operators can open the movable cover 520 to visually observe the water flow and impurity deposition within each tank. This design not only improves the transparency and controllability of the sedimentation process, but also helps to promptly identify and resolve potential problems, ensuring the smooth operation of the entire treatment process.

[0057] Furthermore, when the movable cover 520 is closed, it effectively prevents foreign debris and dust from entering the tank body 510 and disrupting the sedimentation process. Furthermore, the movable cover 520 provides a certain degree of thermal insulation and sound insulation, reducing heat exchange and noise transmission between the tank body 510 and the surroundings, thus providing a more stable and comfortable environment for sedimentation.

[0058] In some specific embodiments, in order to further improve the filtering effect and sedimentation efficiency of the multi-stage sedimentation tank, in addition to the first filter screen 210 and the second filter screen 220 mentioned above, two key components, a backflow prevention plate 230 and a guide plate 240, are specially added.

[0059] First, both the first filter screen 210 and the second filter screen 220 are designed to be tilted. This arrangement helps the water flow better contact the filter screen surface when passing through the filter screen, thereby improving the filtration effect and sedimentation efficiency. In particular, the lower end of the first filter screen 210 is abutted against the inner wall of the first sedimentation tank 100 where the first drain hole 110 is located, and its lower end is intentionally positioned lower than the location of the first drain hole 110. This design ensures that after the water flows through the first filter screen 210, impurities and particulate matter therein are smoothly deposited at the bottom of the first filter screen 210 due to gravity, while the relatively clear water can flow through the first drain hole 110 into the first sedimentation tank 100.

[0060] To effectively prevent backflow during the sedimentation process, a backflow prevention plate 230 is installed. The two ends of this backflow prevention plate 230 are connected to the higher end of the first filter 210 and the lower end of the second filter 220, respectively, forming a stable backflow prevention structure. Notably, the higher end of the first filter 210 is designed to be higher than the higher end of the second filter 220. This layout helps ensure that the water maintains a certain flow direction and pressure gradient when passing through the two filters, thereby further improving sedimentation efficiency.

[0061] Furthermore, a deflector plate 240 is provided to guide water through the second filter screen 220 more smoothly and drain smoothly. One end of this deflector plate 240 is connected to the higher end of the second filter screen 220, while the other end abuts the inner wall of the first settling tank 100, where the second drain hole 120 is located. Specifically, the end of the deflector plate 240 abutting the inner wall of the first settling tank 100 is intentionally positioned no higher than the location of the second drain hole 120. This design ensures that after passing through the second filter screen 220, water flows smoothly along the deflector plate 240 into the second drain hole 120 and out of the settling tank.

[0062] In some specific embodiments, to improve the manufacturing efficiency and structural strength of the filter element 200 while reducing production costs, the filter element 200 is integrally formed from a sheet material. This integrally formed design means that all components of the filter element 200, including the first filter screen 210, the second filter screen 220, the backflow prevention plate 230, and the guide plate 240, are directly manufactured from a single sheet material through precise cutting, bending, and welding processes.

[0063] This design not only simplifies the production process, reducing the number of parts and assembly steps, but also significantly improves the overall structural strength and stability of filter element 200. Because all components are integrally molded, the connections between them are more secure and less susceptible to loosening or damage. Furthermore, the integral design helps reduce resistance to water flow through filter element 200, thereby improving the efficiency of sedimentation treatment.

[0064] Furthermore, the filter element 200, formed from a single piece of sheet material, exhibits excellent corrosion and wear resistance, enabling long-term stable operation in harsh working environments. This design not only extends the service life of the filter element 200 but also reduces maintenance and replacement costs, providing users with a more economical and efficient sedimentation treatment solution.

[0065] In some specific embodiments, the opening area of ​​the first drain hole 110 is smaller than the opening area of ​​the second drain hole 120. Specifically, this design effectively ensures that the sewage water level in the first settling tank 100 always remains between the heights of the first drain hole 110 and the second drain hole 120. This stable water level is crucial for the smooth progress of the sedimentation process. It not only ensures that the sewage has sufficient residence time and space to settle in the settling tank, but also prevents excessively high or low water levels from adversely affecting the sedimentation process.

[0066] In some specific embodiments, filter plates are installed within the first drain hole 110, the second drain hole 120, the water inlet pipe 310, and the drain pipe 410. The design of these filter plates fully considers water flow characteristics and sedimentation requirements. They can effectively intercept and remove suspended matter, particulate matter, and other impurities in the water flow, ensuring that the water flow remains relatively clear and stable as it passes through the various pipes and orifices. In particular, for the first drain hole 110 and the second drain hole 120, the installation of the filter plates not only prevents the direct discharge of unsettled sewage, but also prevents impurities and particulate matter from clogging and wearing the drain holes, thereby extending the service life of the drain holes.

[0067] The filter plates within the inlet pipe 310 and the outlet pipe 410 also play a crucial role. They prevent external impurities and particulate matter from entering the sedimentation tank and disrupting the sedimentation process. Furthermore, the filter plates buffer and disperse the water flow, reducing the impact and wear on the pipe walls, thereby improving the pipe's durability and stability.

[0068] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0069] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A multi-stage sedimentation tank for sedimentation and filtration of chemical wastewater, characterized in that: The multi-stage sedimentation tank comprises: A first settling tank (100), wherein a first drainage hole (110) and a second drainage hole (120) are correspondingly provided on two opposite side walls of the first settling tank (100), and the second drainage hole (120) is provided at a position lower than that of the first drainage hole (110); A filter element (200) is disposed in the first sedimentation tank (100), the filter element (200) comprising a first filter screen (210) and a second filter screen (220), the first filter screen (210) being located on a side of the filter element (200) close to the first drainage hole (110), the second filter screen (220) being located on a side of the filter element (200) close to the second drainage hole (120), and a backflow prevention portion being provided between the first filter screen (210) and the second filter screen (220); The sewage flowing through the first drainage hole (110) can pass through the first filter screen (210) and enter the first sedimentation tank (100). As the sewage in the first sedimentation tank (100) increases, it can overflow the second filter screen (220) and be discharged through the second drainage hole (120). The backflow prevention portion is used to prevent the sewage overflowing the second filter screen (220) from flowing back to the side of the first filter screen (210) close to the first drainage hole (110).

2. The multi-stage sedimentation tank according to claim 1, characterized in that: The invention also includes a second sedimentation tank (300), wherein the second sedimentation tank (300) is connected to the first sedimentation tank (100) through the first drainage hole (110), and a water inlet pipe (310) is provided on the side wall of the second sedimentation tank (300) away from the first drainage hole (110), and the setting position of the water inlet pipe (310) is higher than the setting position of the first drainage hole (110); a first overflow tank (330) is provided in the second sedimentation tank (300), and the first overflow tank (330) is surrounded by the outside of the first drainage hole (110), and the upper opening position of the first overflow tank (330) is higher than the setting position of the water inlet pipe (310).

3. The multi-stage sedimentation tank according to claim 2, characterized in that: A filter basket (320) is provided in the second sedimentation tank (300), the water inlet pipe (310) is passed through the filter basket (320), and the upper opening position of the filter basket (320) is higher than the upper opening position of the first overflow tank (330).

4. The multi-stage sedimentation tank according to claim 2, characterized in that: The invention also includes a third sedimentation tank (400), wherein the third sedimentation tank (400) is connected to the first sedimentation tank (100) through the second drainage hole (120), and a drainage pipe (410) is provided on the side wall of the third sedimentation tank (400).

5. The multi-stage sedimentation tank according to claim 4, characterized in that: The setting position of the drainage pipe (410) is lower than the setting position of the second drainage hole (120); a second overflow pool (420) is provided on the inner side wall of the third sedimentation tank (400) where the drainage pipe (410) is located; the second overflow pool (420) is arranged outside the drainage pipe (410); and the upper opening position of the second overflow pool (420) is not lower than the setting position of the second drainage hole (120).

6. The multi-stage sedimentation tank according to claim 4, characterized in that: The first sedimentation tank (100), the second sedimentation tank (300), and the third sedimentation tank (400) are collectively arranged in a tank body (510), and a partition plate (530) is fixedly inserted in the tank body (510) to form the first sedimentation tank (100), the second sedimentation tank (300), and the third sedimentation tank (400), respectively.

7. The multi-stage sedimentation tank according to claim 6, characterized in that: The upper opening of the pool body (510) is provided with a movable cover plate (520).

8. The multi-stage sedimentation tank according to claim 1, characterized in that: The filter element (200) further comprises an anti-backflow plate (230) and a guide plate (240); the first filter screen (210) and the second filter screen (220) are both arranged at an angle; the lower end of the first filter screen (210) abuts against the inner wall of the first sedimentation tank (100) where the first drainage hole (110) is located; the lower end of the first filter screen (210) is lower than the setting position of the first drainage hole (110); the two ends of the anti-backflow plate (230) are respectively in contact with the upper end of the first filter screen (210) and the lower end of the second filter screen (220); The first filter screen (210) is connected to the second filter screen (220), the higher end of the first filter screen (210) is higher than the higher end of the second filter screen (220), and the anti-backflow plate (230) is used to form an anti-backflow portion; the higher end of the second filter screen (220) is connected to one end of the guide plate (240), and the end of the guide plate (240) away from the filter screen abuts against the inner wall of the first sedimentation tank (100) where the second drainage hole (120) is located, and the end position of the guide plate (240) abutting against the inner wall of the first sedimentation tank (100) is not higher than the setting position of the second drainage hole (120).

9. The multi-stage sedimentation tank according to any one of claims 1 to 8, characterized in that: The opening area of ​​the first drainage hole (110) is smaller than the opening area of ​​the second drainage hole (120).

10. The multi-stage sedimentation tank according to any one of claims 1 to 8, characterized in that: Filter plates are installed in the first drainage hole (110) and the second drainage hole (120).

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