Middle-periphery combined water inlet and peripheral water outlet secondary sedimentation tank

Abstract

The utility model discloses a secondary sedimentation tank combining middle-periphery water inlet and peripheral water outlet in the technical field of sewage treatment devices, and aims to solve the problems of low sedimentation efficiency and low volume utilization rate in a large-diameter sedimentation tank. Comprising a radial-flow type pool body, a water inlet groove is formed around the inner side wall of one circle, a plurality of water inlet holes are formed in the water inlet groove, and the water inlet holes are distributed in the bottom of the water inlet groove in the circumferential direction. The water inlet assembly comprises a water inlet pipe, one end of the water inlet pipe is connected with a water distribution well, the water distribution well is provided with a circumferential inlet pipe communicated with the water inlet groove, and the water distribution well is further provided with a middle inlet pipe with one end close to the center of the radial-flow type pool body. And the water outlet assembly is used for discharging purified water. The desilting part is used for cleaning sludge at the bottom of the radial-flow type pool body. And the fixing piece is positioned at the top of the radial-flow type pool body. The water flow is distributed into the circumferential inlet pipe and the middle inlet pipe through the water distribution well, so that the water flow is synchronously injected from the periphery and the center of the radial-flow type pool body, the uniform distribution of the water flow in the pool is promoted, the short flow phenomenon is reduced, and the sedimentation efficiency is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sewage treatment devices, and particularly relates to a secondary sedimentation tank with combined radial and peripheral water inlet and peripheral water outlet. BACKGROUND

[0002] A secondary sedimentation tank, also known as a secondary settling tank or final settling tank, is an indispensable sewage treatment structure in a sewage treatment plant. Its main functions are to achieve mud-water separation and sludge concentration, thereby ensuring the functions of sludge return, sludge discharge and phosphorus removal in the sewage treatment plant. These functions are crucial for the operation of the entire sewage treatment system and the quality of the effluent. In the practice of sewage treatment plants, the commonly used types of secondary sedimentation tanks include three types: horizontal flow, radial flow and vertical flow. Among them, the radial flow sedimentation tank is widely used in sewage treatment plants due to its stable operation, simple equipment, large daily treatment capacity and small disturbance to the water body.

[0003] However, although the radial flow sedimentation tank has many advantages, there are still some challenges in its actual application. In particular, when the diameter of the sedimentation tank is large, due to the uneven distribution of water flow in the sedimentation tank and the existence of short flow phenomenon, the water flow speed in some areas of the sedimentation tank may be too fast, so that the particulate matter does not have enough time and space to settle, while the water flow in other areas may be too slow, causing the sludge particles to stay for a long time and may cause resuspension phenomenon. Thus, the sedimentation efficiency and volume utilization rate of the radial flow sedimentation tank are reduced. CONTENT OF THE UTILITY MODEL

[0004] The purpose of the present application is to overcome the deficiencies in the prior art and provide a secondary sedimentation tank with combined radial and peripheral water inlet and peripheral water outlet to solve the problem of low sedimentation efficiency and volume utilization rate of the sedimentation tank in the related art.

[0005] To solve the above technical problems, the present application is realized by adopting the following technical scheme:

[0006] On the one hand, the present application provides a secondary sedimentation tank with combined radial and peripheral water inlet and peripheral water outlet, comprising: a radial flow tank body, a water inlet groove is arranged on the inner side wall of one side of the tank body, a plurality of water inlet holes are arranged on the water inlet groove, and the plurality of water inlet holes are distributed on the bottom of the water inlet groove in the circumferential direction; so as to ensure that the water flow can enter uniformly from the periphery of the tank body, reduce the direct impact and disturbance of the water flow on the water body in the tank, and be beneficial to the settlement of particulate matter.

[0007] The water inlet assembly includes an inlet pipe, one end of which is connected to a distribution well. The distribution well has a peripheral inlet pipe connected to the inlet trough, and a central inlet pipe located near the center of the radial flow pool. The distribution well distributes water flow to the peripheral and central inlet pipes. The peripheral inlet pipe guides the water flow into the inlet trough, while the central inlet pipe directs the water flow into the central area of ​​the radial flow pool. This allows for simultaneous water injection from the periphery and center of the radial flow pool, greatly promoting uniform water distribution within the pool, effectively reducing backflow zones, and thus significantly improving sedimentation efficiency.

[0008] The water outlet assembly is used to discharge the purified water;

[0009] Sludge removal components are used to clean sludge from the bottom of radial flow pools.

[0010] The fixing component, located at the top of the radial flow pool, is used to guide the central inlet pipe and fix the sludge removal component.

[0011] Optionally, the water outlet assembly includes: a triangular weir, an outlet trough, and an outlet pipe; the outlet trough is arranged around the side wall of the inlet trough, the triangular weir is arranged around the side wall of the outlet trough, one end of the outlet pipe is connected to the bottom of the outlet trough, and the other end passes through the radial flow pool and connects to the external water collection area. The height of the side wall of the inlet trough away from the radial flow pool is greater than the height of the triangular weir. The triangular weir's arrangement around the side wall of the outlet trough minimizes interference from the upper water flow entering the outlet trough during the water outlet process. This not only helps maintain stable water quality but also avoids potential problems caused by water flow fluctuations, such as water disturbance and particulate resuspension. The height of the side wall of the inlet trough away from the radial flow pool is greater than the height of the triangular weir to prevent cross-seepage between the water flows in the inlet and outlet troughs.

[0012] Optionally, the radial flow tank is a circular tank, which helps to ensure uniform distribution and stable flow of water within the tank. Its bottom has a tapered slope that gradually slopes downwards towards the center, and a recessed sludge collection hopper is located at the center of the bottom, which helps sludge to accumulate towards the center and enter the sludge collection hopper.

[0013] Optionally, the sludge removal component is a center-driven thickening scraper, with its suction port located inside the sludge collection hopper. The center-driven thickening scraper, through a center-driven mechanism, uses scraper blades to push sludge deposited at the bottom of the pool from the outside inwards towards the sludge collection hopper. It also has a suction function, drawing sludge from the collection hopper into a central sludge cylinder above it, and finally discharging it through a connected sludge discharge pipe.

[0014] Optionally, the center drive thickening mud scraper is provided with a flow stabilizing barrel at the center of the center, and the water outlet end of the middle inlet pipe is located in the flow stabilizing barrel. The flow stabilizing barrel is arranged at the center of the center drive thickening mud scraper, and its main function is to stabilize the water flow of the water outlet end of the middle inlet pipe. When the water flow flows into the pool body from the middle inlet pipe, the flow stabilizing barrel can slow down the impact speed of the water flow, so that it is more stable to disperse into the pool body, which helps to maintain the stability of the water flow in the pool body and the normal sedimentation process of the sludge.

[0015] Optionally, the fixing member is a full-bridge truss that spans the radial flow pool body.

[0016] Optionally, the flow ratio of the water inlet of the circumferential inlet pipe to the water inlet of the middle inlet pipe is 2:1.

[0017] Optionally, the water distribution well is provided with a flow regulating valve for regulating the flow of water in the circumferential inlet pipe and the middle inlet pipe. The flow regulating valve can flexibly adjust the water flow in the circumferential inlet pipe and the middle inlet pipe. So that the secondary sedimentation tank can achieve ideal sedimentation effect under different working conditions. Not only improves the treatment efficiency of the sewage treatment system, but also helps to reduce the operation cost and improve the water quality.

[0018] Optionally, the water inlet hole is close to the inner side wall of the radial flow pool body. The close fit of the water inlet hole and the side wall of the radial flow pool body makes the water flow into the pool along the side wall when entering the pool, rather than directly impacting the water body in the pool. This flow-in mode minimizes the direct impact and disturbance of the water flow on the water body in the pool, which is conducive to maintaining the stable state of the water body and providing a good environment for the sedimentation of particulate matter.

[0019] Compared with the prior art, the application has the following beneficial effects:

[0020] Firstly, the utility model adopts the water inlet mode of combining peripheral water inlet and middle water inlet, and reasonably distributes the water flow in the circumferential inlet pipe and the middle inlet pipe with the help of the water distribution well. Not only optimizes the path of water flow into the pool body, but also greatly promotes the uniform distribution of water flow in the pool, significantly reduces the short flow phenomenon, thereby further improves the sedimentation efficiency, improves the volume utilization rate of the secondary sedimentation tank, and makes the sewage treatment process more efficient and stable.

[0021] Secondly, by distributing a plurality of water inlet holes in the circumferential direction on the bottom of the water inlet groove and close to the inner side wall of the radial flow pool body, it is ensured that the water flow can be uniformly distributed around the pool body. This design significantly reduces the direct impact and disturbance of the water flow on the water body in the pool, effectively avoids the phenomenon of uneven water flow distribution, and creates favorable conditions for the smooth sedimentation of sludge.

[0022] Finally, in the water outlet design, the stable flow of water is realized by adopting the combination of triangular weirs and water outlet grooves, the water outlet process is greatly optimized, the possibility of water disturbance and particle resuspension is reduced, and thus the sedimentation efficiency and the water quality of the outlet water are further improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present disclosure, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0024] Figure 1 Fig. 1 is a top view of an embodiment of the present application;

[0025] Figure 2 Fig. 2 is a sectional view of an embodiment of the present application.

[0026] Explanation of reference signs:

[0027] 1-radial pool body; 2-water inlet assembly; 3-water outlet assembly; 4-dredging piece; 5-fixing piece; 11-water inlet groove; 12-sediment collecting hopper; 21-water inlet pipe; 22-distribution well; 23- circumferential inlet pipe; 24-central inlet pipe; 31-water outlet triangular weir; 32-water outlet groove; 33-water outlet pipe; 41-flow stabilizing barrel; 111-water inlet hole. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present disclosure / the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present disclosure / the present application. Obviously, the described embodiments are only some of the embodiments of the present disclosure / the present application, not all. The description of the at least one exemplary embodiment is actually only illustrative, and is by no means any limitation on the present disclosure / the present application and its application or use.

[0029] Embodiment one:

[0030] This embodiment introduces a peripheral water inlet and peripheral water outlet secondary sedimentation tank, which refers to Figure 1 and Figure 2As shown, the peripheral water inlet and peripheral water outlet secondary sedimentation tank in the present embodiment adopts a radial flow tank body 1. The radial flow sedimentation tank is widely used in sewage treatment plants due to its stable operation, simple equipment, large daily treatment capacity, and small disturbance to the water body. The radial flow tank body 1 is provided with a water inlet channel 11 on the inner side wall of one side. The water inlet channel 11 is provided with a plurality of water inlet holes 111. The sludge-water mixture entering the water inlet channel 11 flows into the radial flow tank body 1 through the water inlet holes 111. Further, the plurality of water inlet holes 111 are distributed on the bottom of the water inlet channel 11 in the circumferential direction. Thus, it is ensured that the water flow can enter uniformly from the periphery of the tank body, reducing the direct impact and disturbance of the water flow on the water body in the tank, which is beneficial to the sedimentation of particulate matter.

[0031] In the present embodiment, the sludge-water mixture enters the radial flow tank body 1 through the water inlet assembly 2. The water inlet assembly 2 includes a water inlet pipe 21, one end of which is connected to a water distribution well 22. The water distribution well 22 is provided with a circumferential inlet pipe 23 communicating with the water inlet channel 11, and a central inlet pipe 24 with one end close to the center of the radial flow tank body 1. The water inlet pipe 21 introduces the sludge-water mixture to be treated into the water distribution well 22, and the water distribution well 22 plays a role in distributing the water flow. The water flow is distributed to the circumferential inlet pipe 23 and the central inlet pipe 24 through the water distribution pipe. The circumferential inlet pipe 23 guides the water flow into the water inlet channel 11, while the central inlet pipe 24 guides the water flow into the central area of the radial flow tank body 1. This realizes the simultaneous injection of water flow from the periphery and the center of the radial flow tank body 1, greatly promotes the uniform distribution of water flow in the tank, effectively reduces the generation of backflow area, and thus significantly improves the sedimentation efficiency.

[0032] The present embodiment also includes a water outlet assembly 3 for discharging purified water, and a sludge cleaning element 4 for cleaning the bottom of the radial flow tank body 1. As a key link in the sewage treatment process, the secondary sedimentation tank is responsible for removing suspended solids and clarifying water quality. Over time, sludge will accumulate at the bottom of the tank, and these deposits will affect the quality of the effluent and reduce the sedimentation efficiency. Therefore, regular cleaning of the secondary sedimentation tank is necessary. The cleaning of the secondary sedimentation tank can be done manually or with the help of professional mechanical equipment, which is not limited. The top of the radial flow tank body 1 is provided with a fixing element 5 for guiding the central inlet pipe 24 and fixing the cleaning element 4. The fixing element 5 can be a steel structure truss or a maintenance platform, etc. In actual application, the most suitable form of the fixing element 5 can be selected according to the size, structural characteristics, operation requirements and cost budget of the secondary sedimentation tank, etc. The present embodiment is not limited. Through the setting of the fixing element 5, the stable position of the central inlet pipe 24 in the tank body can be ensured, and the installation and maintenance of the cleaning element 4 are facilitated.

[0033] Embodiment two:

[0034] Based on the same inventive concept as embodiment 1, reference is made to Figure 1 and Figure 2As shown, the peripheral inflow and peripheral outflow secondary sedimentation tank in the present embodiment also adopts the radial flow tank body 1. The radial flow sedimentation tank is widely used in sewage treatment plants due to its stable operation, simple equipment, large daily treatment capacity, and small disturbance to the water body. The radial flow tank body 1 is provided with a water inlet groove 11 on the inner side wall of one of its circumferences. The water inlet groove 11 is provided with a plurality of water inlet holes 111. The sludge-water mixture entering the water inlet groove 11 flows into the radial flow tank body 1 through the water inlet holes 111. In the present embodiment, the plurality of water inlet holes 111 are distributed on the bottom of the water inlet groove 11 in the circumferential direction, and the water inlet holes 111 are in close contact with the inner side wall of the radial flow tank body 1. By distributing the water inlet holes 111 in the circumferential direction, it can be ensured that the water flow enters uniformly from the periphery of the tank body. This avoids the water flow being concentrated in a certain area, causing the local water flow velocity to be too fast or the pressure to be too large, thereby affecting the settling effect of the particulate matter. The close fit of the water inlet holes 111 with the side wall of the radial flow tank body 1 enables the water flow to flow into the tank along the side wall when entering the tank, rather than directly impacting the water body in the tank. This flow mode minimizes the direct impact and disturbance of the water flow on the water body in the tank, which is conducive to maintaining the stable state of the water body and provides a good environment for the settling of particulate matter.

[0035] In the present embodiment, the sludge-water mixture enters the radial flow tank body 1 through the water inlet assembly 2. The water inlet assembly 2 includes a water inlet pipe 21, one end of which is connected to a water distribution well 22. The water distribution well 22 is provided with a circumferential inlet pipe 23 communicating with the water inlet groove 11, and a central inlet pipe 24 with one end near the center of the radial flow tank body 1. The water inlet pipe 21 in this embodiment introduces the sludge-water mixture to be treated into the water distribution well 22, which plays a role in distributing the water flow. The water flow is distributed to the circumferential inlet pipe 23 and the central inlet pipe 24 through the water distribution pipe. The circumferential inlet pipe 23 guides the water flow into the water inlet groove 11, while the central inlet pipe 24 guides the water flow into the central area of the radial flow tank body 1. This realizes the simultaneous injection of water flow from the periphery and the center of the radial flow tank body 1, greatly promoting the uniform distribution of water flow in the tank, effectively reducing the occurrence of short-circuit phenomenon, and thus significantly improving the sedimentation efficiency. In this process, the distribution ratio of water inlet is only crucial in the sewage treatment process. In the present example, the water inlet flow ratio of the circumferential inlet pipe 23 and the central inlet pipe 24 is set to 2:1.

[0036] In the radial flow sedimentation tank, the sedimentation effect is affected by multiple factors such as sludge concentration of sludge-water mixture, amount of sludge accumulation in the tank, uneven water flow, etc. In order to cope with these challenges and ensure that the sedimentation process reaches the optimal state, the present embodiment is provided with a flow regulating valve in the water distribution well 22. The flow regulating valve can flexibly adjust the water inlet flow in the circumferential inlet pipe 23 and the central inlet pipe 24. This enables the secondary sedimentation tank to achieve ideal sedimentation effect under different working conditions, improves the treatment efficiency of the sewage treatment system, and improves the water quality of the effluent.

[0037] The embodiment also includes a water outlet assembly 3 for discharging the purified water. The water outlet assembly 3 includes a water outlet triangular weir 31, a water outlet groove 32, and a water outlet pipe 33. The water outlet groove 32 is arranged around the side wall of the water inlet groove 11, the water outlet triangular weir 31 is arranged around the side wall of the water outlet groove 32, and one end of the water outlet pipe 33 is connected to the bottom of the water outlet groove 32 and the other end penetrates the radial flow tank 1 and is connected to an external water collecting area. In the embodiment, the water outlet triangular weir 31 is arranged around the side wall of the water outlet groove 32, and the upper layer of water flow enters the water outlet groove 32 during the water outlet process, which causes less disturbance in the tank. Not only is it helpful to maintain the stability of the water quality, but it can also avoid potential problems caused by water flow fluctuations, such as water disturbance, particle resuspension, and the like. It should be noted that in the present scheme, the height of the side wall of the water inlet groove 11 away from the radial flow tank 1 is greater than the height of the water outlet triangular weir 31, so as to avoid the water flow in the water inlet groove 11 and the water outlet groove 32 from penetrating each other.

[0038] In the embodiment, the radial flow tank 1 is a circular tank, which is helpful for the uniform distribution and stable flow of water in the tank. The bottom of the circular tank has a conical slope that gradually inclines towards the center, and a sludge collecting hopper 12 is arranged at the center of the bottom, which is helpful for the sludge to gather towards the center and enter the sludge collecting hopper 12. A full-bridge truss is arranged at the top of the secondary sedimentation tank, which can be used to guide the inlet pipe 24. Further, the embodiment uses a center-driven thickening mud scraper for dredging work. The top of the center-driven thickening mud scraper is fixed on the full-bridge truss, and the mud suction port at the bottom is located in the sludge collecting hopper 12. The center-driven thickening mud scraper pushes the sludge deposited on the bottom of the tank towards the sludge collecting hopper 12 from the outside to the inside through the center-driven mode and the mud scraping plate arranged thereon, and has a mud suction function, which can suck the sludge in the sludge collecting hopper 12 into the center mud tank on it, and finally discharge through the mud discharge pipe connected thereto. Further, the center-driven thickening mud scraper is provided with a flow stabilizing barrel 41 at the center, and the outlet end of the inlet pipe 24 is located in the flow stabilizing barrel 41. The flow stabilizing barrel 41 is arranged at the center of the center-driven thickening mud scraper, and its main function is to stabilize the water flow at the outlet end of the inlet pipe 24. When the water flow flows into the tank from the inlet pipe 24, the flow stabilizing barrel 41 can slow down the impact speed of the water flow, so that it can be dispersed more stably into the tank, which is helpful to maintain the stability of the water flow in the tank and the normal sedimentation process of the sludge.

[0039] The above only describes the preferred embodiments of the present disclosure / application, and it should be noted that those skilled in the art can make several improvements and modifications without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present disclosure / application.

Claims

1. A combined mid-peripheral inlet and peripheral outlet secondary clarifier, characterized in that, The application relates to a radial flow type pool body (1) which is provided with a water inlet groove (11) on the inner side wall of one side, the water inlet groove (11) is provided with a plurality of water inlet holes (111), and the water inlet holes (111) are distributed on the bottom of the water inlet groove (11) in the circumferential direction; a water inlet assembly (2) which comprises a water inlet pipe (21) and is connected with a water distribution well (22) at one end, the water distribution well (22) is provided with a circumferential inlet pipe (23) which is connected with the water inlet groove (11), and the water distribution well (22) is further provided with a middle inlet pipe (24) which is located close to the central position of the radial flow type pool body (1); a water outlet assembly (3) which is used for discharging purified water; a dredging device (4) which is used for cleaning sludge on the bottom of the radial flow type pool body (1); and a fixing device (5) which is located on the top of the radial flow type pool body (1) and is used for guiding the middle inlet pipe (24) and fixing the dredging device (4). The water outlet assembly (3) comprises a water outlet triangular weir (31), a water outlet groove (32) and a water outlet pipe (33); the water outlet groove (32) is arranged around the side wall of the water inlet groove (11); the water outlet triangular weir (31) is arranged around the side wall of the water outlet groove (32); one end of the water outlet pipe (33) is connected with the bottom of the water outlet groove (32) in a communicating mode; the other end of the water outlet pipe (33) penetrates through the radial flow type pool body (1) and is connected with an external water collecting area; and the height of the side wall of the water inlet groove (11) which is far away from the radial flow type pool body (1) is greater than the height of the water outlet triangular weir (31). The radial flow type pool body (1) is a circular pool body which is provided with a conical slope which gradually inclines towards the center on the bottom and is provided with a sludge collecting hopper (12) which is recessed inward at the center of the bottom. The dredging device (4) is a central transmission concentrated mud scraper, and the mud suction port of the central transmission concentrated mud scraper is located in the sludge collecting hopper (12). The central transmission concentrated mud scraper is provided with a flow stabilizing barrel (41) at the center, and the water outlet end of the middle inlet pipe (24) is located in the flow stabilizing barrel (41). The fixing device (5) is a full-bridge type truss which spans the radial flow type pool body (1).

2. The peripheral inflow and peripheral outflow secondary sedimentation tank according to claim 1, characterized in that, The flow ratio of water in the circumferential inlet pipe (23) to water in the middle inlet pipe (24) is 2:

1.

3. The peripheral inflow and peripheral outflow secondary sedimentation tank according to claim 1, characterized in that, The water distribution well (22) is provided with a flow adjusting valve which is used for adjusting the flow of water in the circumferential inlet pipe (23) and the middle inlet pipe (24).

4. The peripheral inflow and peripheral outflow secondary sedimentation tank according to claim 3, characterized in that, The water inlet holes (111) are close to the inner side wall of the radial flow type pool body (1).

5. The peripheral inflow and peripheral outflow secondary sedimentation tank according to claim 4, characterized in that, ​ 6. The peripheral inflow and peripheral outflow secondary sedimentation tank according to claim 1, wherein ​ 7. The secondary sedimentation tank of claim 1, wherein ​ 8. The peripheral inlet peripheral outlet secondary sedimentation tank with central junction according to claim 1, characterized in that ​ 9. The peripheral inflow and peripheral outflow secondary sedimentation tank according to claim 1, wherein ​

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