A kind of outlet weir assembly for low flow rate inclined plate sedimentation tank

Abstract

This utility model discloses an effluent weir assembly for a low-flow-rate inclined plate sedimentation tank, comprising a water collection plate and an effluent weir. The water collection plate, located in front of the effluent weir, divides the inclined plate sedimentation tank into a sedimentation zone and an effluent zone. The water collection plate has several perforations through which water flows. The cross-section of the effluent weir is formed by multiple identical geometric units connected end-to-end and continuously arranged, forming water collection channels. The effluent weir is located on the effluent side of the effluent zone. By setting up the water collection plate and providing water through the perforations, a low-disturbance rectification zone is formed in front of the effluent weir, greatly reducing hydraulic disturbance. Furthermore, designing the water collection plate as a polygonal structure further optimizes its flow guiding effect and reduces vortices that may be generated when water flows through the baffle.

Description

Technical Field

[0001] This utility model relates to the field of water treatment, specifically an effluent weir assembly for a low-flow-rate inclined plate sedimentation tank. Background Technology

[0002] Inclined plate sedimentation tanks are commonly used key structures in water treatment processes to achieve sludge-water separation. The effluent weir, as an important transitional component between the inclined plate sedimentation tank and subsequent filters, plays a crucial role in uniformly collecting the supernatant and controlling the effluent flow rate. The structural design of the effluent weir directly affects the flow pattern of the effluent, thus profoundly influencing the treatment efficiency of the inclined plate sedimentation tank and the operating load of the subsequent filters.

[0003] Currently, the effluent weirs in common inclined plate sedimentation tanks are mostly simple flat plate structures, or made of a flat concrete wall, steel plate, or other materials. These structures have significant drawbacks: when the effluent from the sedimentation tank impacts the flat weir surface at a high flow rate, severe turbulence, hydraulic jumps, and vortices are generated. This intense hydraulic disturbance not only stirs up the already settled flocs at the bottom of the tank but also easily breaks down larger flocs (alum flocs) in the water, forming even finer particles that are difficult to settle or filter.

[0004] Therefore, a side-flow sedimentation process is adopted in the sedimentation zone of the sedimentation tank (traditional inclined plates use upflow). The water flows horizontally through the transversely diverting inclined plates, and the flocs settle to the bottom of the sedimentation zone. However, the water treated by the side-flow sedimentation process still contains some flocs and floc particles, which enter the effluent zone through perforations on the collection plate. The effluent weir acts as a preliminary filter in this process, separating the flocs and floc particles and collecting the supernatant. The effluent zone collects the treated water from the sedimentation zone, and the limited space causes the following problems.

[0005] In the area corresponding to the baffle between the water collection plate and the outlet weir, the width is further reduced, and the water directly impacts the baffle, resulting in large water flow disturbance. This not only aggravates the disturbance of flocs and floc particles in the water, but also makes it easy for the flocs to break into smaller particles that are difficult to settle or filter, thus making them easy to be carried into the filtration tank by the supernatant.

[0006] Water discharged from the lower middle part of the collection plate carries away sludge (sediment formed by the aggregation of large amounts of flocs, which is not discharged to the bottom of the sedimentation zone through the mud-sliding port in time) from the bottom mud-sliding plate at the bottom of the outlet zone. The sludge floats to the surface with the water flow, which also affects the settling of the flocs. This sludge tends to accumulate in the area corresponding to the partition between the collection plate and the outlet weir, and is further agitated and impacted by secondary water flow, which further exacerbates the formation of fine particles that are difficult to settle or filter.

[0007] Furthermore, to improve the flow conditions within the sedimentation tank, existing technologies typically incorporate baffles (or baffles) for flow rectification. However, these baffles are often simple vertical or inclined flat plates, and their interaction with the effluent weir is relatively straightforward, failing to create a synergistic effect. The main function of the baffles is merely to initially regulate the flow direction, offering limited optimization for the final flow pattern formed in the critical area near the effluent weir. After initial rectification by the baffles, the effluent still exhibits a high velocity at the moment of overcoming the weir, resulting in a rapid change in flow direction and causing secondary turbulence in the vicinity of the weir.

[0008] Therefore, this application proposes an effluent weir assembly for a low-flow-rate inclined plate sedimentation tank to overcome the deficiencies of the prior art. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of the prior art and propose an effluent weir assembly for a low-velocity inclined plate sedimentation tank. By setting the special shape of the water collection plate and the baffle, multiple water collection channels are formed, which increases the contact area between the baffle and the weir plate and the water flow, reduces the overturning flow velocity, reduces the impact of the water on the baffle when the water flows through the baffle, and avoids further eddies generated by the baffle itself.

[0010] To achieve the above objectives, the specific technical solution adopted by this utility model is as follows: An effluent weir assembly for a low-flow-rate inclined plate sedimentation tank includes a water collection plate and an effluent weir. The water collection plate, located in front of the effluent weir, divides the inclined plate sedimentation tank into a sedimentation zone and an effluent zone. The water collection plate has several perforations through which water flows. The cross-section of the effluent weir is formed by multiple identical geometric units connected end-to-end in a continuous arrangement, forming water collection channels. The effluent weir is located on the effluent side of the effluent zone. By setting up the water collection plate and providing water through the perforations, a low-disturbance rectification zone is formed in front of the effluent weir, greatly reducing hydraulic disturbance. Furthermore, the special structural design of the water collection plate further optimizes its flow guiding effect, reducing vortices that may be generated when water flows through the baffle.

[0011] Preferably, the geometric unit forming the effluent weir of the inclined plate sedimentation tank is wavy, rectangular, trapezoidal or triangular.

[0012] Preferably, the inclined plate sedimentation tank effluent weir includes an effluent weir bottom plate and a baffle plate. The baffle plate is fixed on the effluent weir bottom plate, and the cross-section of the baffle plate is formed by multiple identical geometric units connected end to end and continuously arranged.

[0013] Preferably, the geometric unit forming the partition is wavy, rectangular, trapezoidal or triangular, and the geometric unit forms a water collection channel.

[0014] Preferably, a weir plate is installed on the top side of the partition.

[0015] Preferably, an inclined mud-sliding plate is provided between the water collection plate and the effluent weir of the inclined plate sedimentation tank. The bottom side is fixedly connected to the bottom side of the water collection plate. The side where the mud-sliding plate connects to the water collection plate is the lower side. A mud-sliding hole is provided at the bottom of the water collection plate.

[0016] The design of the mud-sliding plate allows water flocs to slide downwards along it, and the mud-sliding plate also guides and cushions the water flocs, preventing them from breaking apart due to excessive speed. Furthermore, the mud-sliding holes, guided by the mud-sliding plate, allow the water flocs to pass smoothly through the water collection plate, while also hindering the reverse movement of the water flocs.

[0017] Preferably, the weir plate and the partition plate are connected in adjustable height by bolts. The weir plate is provided with a bladder-shaped hole, and the partition plate is provided with a circular hole. The bladder-shaped hole and the circular hole correspond to each other, and the weir plate is connected to the partition plate in adjustable height by bolts.

[0018] Preferably, the cross-section of the weir plate is formed by connecting multiple identical geometric units end to end and arranging them continuously. The cross-section of the weir plate is adapted to the cross-section of the baffle plate to increase the water contact area and reduce the overturning flow velocity.

[0019] Preferably, the geometric unit forming the weir plate is wavy, rectangular, trapezoidal or triangular, and has multiple water collection and weir passages.

[0020] Preferably, the weir plate has multiple overflow holes in a region 30-100mm from its upper edge.

[0021] Preferably, the weir plate is made of stainless steel and has a thickness of 3-8 mm.

[0022] As a preferred method, by adjusting the height of the weir plate, the effluent water level and flow rate can be controlled to adapt to different influent flow rates and treatment requirements, and the effluent velocity of the inclined plate sedimentation tank will not increase due to changes in influent flow rate.

[0023] This invention significantly reduces turbulence, eddies, and impacts at the outlet by increasing the surface area and reducing velocity using polygonal weir plates and pre-stabilizing the flow using flow-rectifying baffles. This directly prevents the re-floating of settled flocs at the bottom and minimizes the breakage of larger flocs into fine particles during weir overflow. The end result is a significant reduction in solid impurities carried in the effluent, leading to superior water quality.

[0024] This invention features an inclined mud-sliding plate between the outlet weir and the collection plate. This allows the water discharged from the lower middle part of the collection plate to carry the sludge on the mud-sliding plate at the bottom of the outlet area. Under the guidance of the mud-sliding plate, the sludge that has accumulated into a large number of flocs can be discharged to the bottom of the sedimentation area in a timely manner through the mud-sliding port. This avoids secondary water flow disturbance and impact, ensuring that the flocs that have settled at the bottom will not float back up.

[0025] The adjustable height design of the weir plate in this invention allows operators to flexibly control the outlet water level and flow rate according to changes in the influent volume, ensuring ideal low-disturbance effects under different operating conditions. This adaptability ensures stable treatment results and improves the system's resistance to shock loads.

[0026] The core components of this invention (polygonal weir plate and baffle plate) can be made of conventional materials (such as stainless steel), making processing and installation simple and requiring no complex power or control system. Compared to solutions that require additional chemical agents or complex mechanical sludge removal, this invention has low investment costs, minimal maintenance, and reliable operation, making it very suitable for widespread application in newly built or renovated inclined plate sedimentation tanks in water treatment plants.

[0027] This invention systematically solves the key technical problem of effluent turbulence in inclined plate sedimentation tanks through the synergistic innovative design of the effluent weir and the flow-rectifying baffle. Its effects are not only reflected in improving the performance of the inclined plate sedimentation tank itself, but more importantly, in bringing overall energy-saving and consumption-reducing benefits through the optimization of the entire "inclined plate sedimentation-filtration" process. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of a low-flow-rate inclined plate sedimentation tank according to the present invention.

[0029] Figure 2 for Figure 1 A schematic diagram of the structure of the first embodiment of the outlet weir plate.

[0030] Figure 3 for Figure 2 A schematic diagram of the structure of the central weir plate.

[0031] Figure 4 for Figure 2 The front view.

[0032] Figure 5 for Figure 2 Top view.

[0033] Figure 6 for Figure 1 A schematic diagram of the structure of the second type of outlet weir plate embodiment.

[0034] Figure 7 for Figure 6A schematic diagram of the structure of the central weir plate.

[0035] Figure 8 for Figure 6 The front view.

[0036] Figure 9 for Figure 6 Top view.

[0037] Figure 10 for Figure 1 A schematic diagram of the structure of the third type of outlet weir plate embodiment.

[0038] Figure 11 for Figure 10 A schematic diagram of the structure of the central weir plate.

[0039] Figure 12 for Figure 10 The front view.

[0040] Figure 13 for Figure 10 Top view.

[0041] Figure 14 for Figure 1 A schematic diagram of the fourth type of outlet weir plate embodiment.

[0042] Figure 15 for Figure 14 A schematic diagram of the structure of the central weir plate.

[0043] Figure 16 for Figure 14 The front view.

[0044] Figure 17 for Figure 14 Top view.

[0045] Attached Figure

[0046] 1- Inclined plate sedimentation tank, 2- Water collection plate, 3- Inclined plate sedimentation tank effluent weir, 301- Weir plate, 302- Baffle plate, 303- Water collection channel, 304- Spherical hole, 4- Filter tank, 5- Effluent channel, 6- Effluent weir bottom plate, 7- Sedimentation and filtration baffle plate, 8- Sliding hole, 9- Sliding plate. Detailed Implementation

[0047] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that, unless otherwise specified, the embodiments and features described in the embodiments of the present invention can be combined with each other.

[0048] An effluent weir assembly for a low-flow-rate inclined plate sedimentation tank, such as Figure 1As shown, it includes a water collection plate 2 and an inclined plate sedimentation tank effluent weir 3.

[0049] Understandably, in practical applications, the effluent weir assembly provided in this embodiment features a sedimentation filter baffle 7 at the effluent end of the sedimentation tank. The inclined plate sedimentation tank is divided into a sedimentation zone and an effluent zone by an inner water collection plate 2. The water in the sedimentation zone flows horizontally through the water collection plate 2 and enters the effluent zone. The water collection plate 2 has several perforations. An inclined plate sedimentation tank effluent weir 3 is fixed on the sedimentation filter baffle 7 and is located on the effluent side of the effluent zone. The perforated water collection plate 2 creates a low-disturbance rectifying zone in front of the sedimentation tank effluent weir 3.

[0050] Understandably, the water in the lower part of the collection plate needs to flow through the channel between the perforated section and the bottom plate of the effluent weir 3 of the sedimentation tank to the low-turbulence rectification zone, forming an S-shaped path. This extends the water flow distance and increases the settling time of flocs and floc particles, thus achieving a rectification effect and forming a low-turbulence rectification zone. In this low-turbulence environment, the flocs at the bottom of the inclined plate sedimentation tank 2 are not easily re-stirred, and the flocs such as alum in the water are also prevented from breaking due to severe hydraulic shear. The direct effect is a significant improvement in effluent quality and a reduction in the content of fine particulate matter carried in the effluent. This fundamentally reduces the filtration load on the subsequent filter 4, thereby effectively extending the backwashing cycle of the filter and saving backwashing water and energy consumption.

[0051] Furthermore, an inclined plate sedimentation tank effluent weir 3 is provided at the effluent end of the inclined plate sedimentation tank 2. For example... Figure 1 As shown, the effluent weir 3 of the inclined plate sedimentation tank is usually composed of a weir plate 301 and a baffle plate 302, with the weir plate 301 installed on the top side of the baffle plate 302.

[0052] Further settings in this embodiment, such as Figure 2-17 As shown, the effluent weir 3 of the inclined plate sedimentation tank includes an effluent weir bottom plate 6 and a baffle plate 302. The effluent weir bottom plate 6 is fixed on the sedimentation and filtration baffle plate 7, and the baffle plate 302 is fixed on the effluent weir bottom plate 6. The cross-section of the baffle plate 302 is formed by multiple identical geometric units connected end to end and continuously arranged. This geometric unit can be a continuous wave shape, or it can be rectangular, trapezoidal, or triangular, etc. The core of this polygonal design is to increase the effective flow contact area of ​​the weir plate. According to the principle of fluid mechanics (Q = V × A), when the influent flow rate Q is constant, the increase of the flow area A will inevitably lead to a decrease in the flow velocity V. Therefore, when the water flows over this polygonal baffle plate 302, its flow velocity decreases gradually, avoiding turbulence caused by the impact of high-speed water flow.

[0053] The partition 302, which is formed by connecting and arranging multiple identical geometric units end to end, provides multiple water collection channels 303 and provides turbulence space. The water discharged from the water collection plate directly impacts the partition 302. The cross-sectional design can divert and guide the water into the water collection channels 303, thereby reducing disturbance.

[0054] Furthermore, the water in the lower part of the outlet area can easily form an upward flow in the water collection channel 303, which guides the water flow in the low-disturbance rectification zone to rise steadily, further stabilizing the water flow in the low-disturbance rectification zone and thus further reducing disturbance.

[0055] Furthermore, a sliding mud plate 9 is inclinedly installed at the bottom of the water outlet area. One side of the sliding mud plate 9 is fixed to the water collection plate 2, and the other side is fixed to the sedimentation filter baffle 7. The side of the sliding mud plate 9 on the water collection plate 2 is lower than the side of the sedimentation filter baffle 7. The water collection plate 2 has sliding mud holes 8. The sliding mud plate allows water flocs to slide downwards along it, and it also guides and buffers the water flocs, preventing them from breaking apart due to excessive speed. In addition, the sliding mud holes allow the water flocs to pass smoothly through the water collection plate under the guidance of the sliding mud plate, while also hindering the reverse movement of the water flocs.

[0056] In a further embodiment, to achieve flexible adjustment of the effluent level, the weir plate 301 and the supporting partition plate 302 are adjustablely connected by bolts. In this embodiment, a capsule-shaped hole 304 (elongated hole) is formed on the weir plate 301, and a circular hole is formed at the corresponding position on the partition plate 302. During installation, bolts are passed through the capsule-shaped hole 304 and the circular hole and tightened. When it is necessary to adjust the height of the weir plate, the bolts are loosened, and the weir plate 301 can slide up and down along the length of the capsule-shaped hole 304. After positioning, the bolts are tightened again, thus easily achieving the height adjustment of the weir plate 301.

[0057] Understandably, as a preferred auxiliary water discharge structure, multiple overflow holes (not shown in the figure) can be opened on the weir plate 301 in an area 30-100mm from its upper edge. These overflow holes can assist in water discharge when the water level fluctuates slightly, which helps to stabilize the water level in front of the weir and further enhances the system's resistance to shocks.

[0058] In a further embodiment, the weir plate 301 and the water collection plate 2 are preferably made of corrosion-resistant stainless steel with a thickness between 3mm and 8mm to ensure sufficient structural strength and long service life. The connection method can be welding or bolting.

[0059] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An effluent weir assembly for a low-flow-rate inclined plate sedimentation tank, characterized in that, The system includes a water collection plate (2) and an inclined plate sedimentation tank effluent weir (3). The water collection plate (2) is located in front of the inclined plate sedimentation tank effluent weir (3) and divides the inclined plate sedimentation tank into a sedimentation area and an effluent area. The water collection plate (2) has several perforations through which water flows. The cross-section of the inclined plate sedimentation tank effluent weir (3) is formed by multiple identical geometric units connected end to end and arranged continuously. The geometric units form a water collection channel (303). The inclined plate sedimentation tank effluent weir (3) is located on the effluent side of the effluent area.

2. The effluent weir assembly for a low-flow-rate inclined plate sedimentation tank according to claim 1, characterized in that, The geometric unit forming the effluent weir (3) of the inclined plate sedimentation tank is wavy, rectangular, trapezoidal or triangular.

3. The effluent weir assembly for a low-flow-rate inclined plate sedimentation tank according to claim 1, characterized in that, The inclined plate sedimentation tank effluent weir (3) includes an effluent weir bottom plate (6) and a partition plate (302). The partition plate (302) is fixed on the effluent weir bottom plate (6). The cross section of the partition plate (302) is formed by multiple identical geometric units connected end to end and arranged continuously.

4. The effluent weir assembly for a low-flow-rate inclined plate sedimentation tank according to claim 3, characterized in that, The geometric unit forming the partition (302) is wavy, rectangular, trapezoidal or triangular, and the geometric unit forms a water collection channel (303).

5. The effluent weir assembly for a low-flow-rate inclined plate sedimentation tank according to claim 3, characterized in that, A weir plate (301) is installed on the top side of the partition (302).

6. The effluent weir assembly for a low-flow-rate inclined plate sedimentation tank according to claim 3, characterized in that, An inclined mud-sliding plate (9) is provided between the water collection plate (2) and the effluent weir (3) of the inclined plate sedimentation tank. The bottom side of the mud-sliding plate (9) is fixedly connected to the bottom side of the water collection plate (2). The connection side between the mud-sliding plate (9) and the water collection plate (2) is the lower side. A mud-sliding hole (8) is provided at the bottom of the water collection plate (2).

7. The effluent weir assembly for a low-flow-rate inclined plate sedimentation tank according to claim 5, characterized in that, The weir plate (301) and the partition plate (302) are connected in adjustable height by bolts. The weir plate (301) is provided with a sac-shaped hole (304), and the partition plate (302) is provided with a circular hole. The sac-shaped hole (304) corresponds to the circular hole, and the weir plate (301) is connected in adjustable height on the partition plate (302) by bolts.

8. The effluent weir assembly for a low-flow-rate inclined plate sedimentation tank according to claim 5, characterized in that, The cross-section of the weir plate (301) is formed by connecting multiple identical geometric units end to end and arranging them continuously. The cross-section of the weir plate (301) is adapted to that of the partition plate (302).

9. The effluent weir assembly for a low-flow-rate inclined plate sedimentation tank according to claim 5, characterized in that, The geometric units forming the weir plate (301) are wavy, rectangular, trapezoidal or triangular.

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