Combined peripheral inlet and peripheral outlet type sedimentation tank

Abstract

The utility model discloses a combined peripheral inlet and peripheral outlet type sedimentation tank which comprises a sedimentation tank main body, a water distribution channel is arranged on the inner wall of the sedimentation tank main body, a water outlet channel is arranged on the inner side of the water distribution channel, a water inlet pipeline is arranged at the bottom of the water distribution channel, and a flow guide part is arranged at a water outlet of the water inlet pipeline. A water outlet weir plate is arranged on the inner side of the water outlet channel; an inclined plate sedimentation device is arranged in the sedimentation tank main body; a sludge tank is arranged at the bottom of the sedimentation tank main body and connected with a sludge discharge part, an inclined plate is additionally arranged in the sludge-water separation area to enhance the sludge-water separation effect, so that suspended solids in effluent are reduced; the water outlet index is better under the condition of the same designed water quantity and water quality; and the treatment load can be increased under the condition of the same design size and effluent index of the sedimentation tank.

Description

Technical Field

[0001] This utility model relates to the field of sewage treatment equipment technology, specifically a combined perimeter inlet and perimeter outlet sedimentation tank. Background Technology

[0002] With the rapid development of industry, many industrial enterprises have emerged, generating large amounts of industrial wastewater containing high concentrations of organic matter, suspended solids, and other pollutants during production. Due to limited land and cost constraints, enterprises must consider the optimal solution when selecting treatment processes and equipment. Among various pieces of equipment, sedimentation tanks are crucial, directly impacting various indicators of the enterprise's wastewater discharge.

[0003] Sedimentation tanks are structures that remove suspended solids and precipitates from water using sedimentation. They can also be made into non-standard complete sets of equipment. They utilize the natural sedimentation or coagulation sedimentation process to remove suspended solids from water. Sedimentation tanks are classified into horizontal sedimentation tanks and vertical sedimentation tanks according to the water flow direction. The sedimentation effect depends on the water flow velocity and the residence time of the water in the sedimentation tank. Commonly used sedimentation tanks include auxiliary flow sedimentation tanks, vertical flow sedimentation tanks, inclined plate sedimentation tanks, etc.

[0004] Radial flow sedimentation tanks are generally circular in shape. Wastewater enters the tank through a central inlet pipe and flows slowly outwards radially. Suspended solids settle during this flow and enter the sludge hopper along the bottom slope. Clarified water overflows from the perimeter into a drainage channel. Radial flow sedimentation tanks typically use rotary scrapers to collect sludge. The scraper blades move the sludge that has settled to the bottom to the sludge hopper in the center of the tank, where it is then discharged by gravity or a sludge pump. To meet the sludge discharge requirements of the scraper, the bottom slope of the radial flow sedimentation tank is gentle. Several important indicators exist in the design and operation of sedimentation tanks, including settling time, surface loading, and weir overflow load, among which surface loading is often the most important factor in the specific design process.

[0005] In recent years, radial flow sedimentation tanks with peripheral inlet and outlet have been widely used in municipal wastewater treatment. They are a type of sedimentation tank with high sedimentation efficiency, and compared to other types of radial flow sedimentation tanks, their design surface loading and effluent weir loading can be increased by about 100%. Although radial flow sedimentation tanks with peripheral inlet and outlet have many advantages over center-inlet radial flow sedimentation tanks, the following problems still exist in practical applications: 1. High requirements for water flow uniformity. Uneven water distribution can easily lead to dead zones or short-circuiting, resulting in a decrease in sedimentation effect. The levelness of the effluent weir needs to be strictly calibrated; otherwise, it may cause local overflow problems. 2. Scum problem. Surface scum may accumulate in the center of the tank, requiring additional skimming devices, increasing management complexity. Utility Model Content

[0006] The purpose of this invention is to provide a combined circumferential inlet and circumferential outlet sedimentation tank to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A combined perimeter-inlet and perimeter-outlet sedimentation tank includes a sedimentation tank body, a water distribution channel provided on the inner wall of the sedimentation tank body, an outlet channel provided on the inner side of the water distribution channel, an inlet pipe provided at the bottom of the water distribution channel, a guide section provided at the outlet of the inlet pipe, and an outlet weir plate provided on the inner side of the outlet channel.

[0009] The sedimentation tank is equipped with an inclined plate sedimentation device.

[0010] The sedimentation tank is equipped with a sludge trough at the bottom of its main body, and the sludge trough is connected to a sludge discharge section.

[0011] As a further embodiment of this utility model: the main body of the sedimentation tank is a rectangular structure, and the water distribution channel is located on the inner wall of one side of the main body of the sedimentation tank.

[0012] As a further embodiment of this utility model: the flow guiding part includes a reflective guide plate and a flow guiding skirt located below the water distribution channel. The reflective guide plate is arranged horizontally and fixedly connected to the inner wall of the sedimentation tank body. The flow guiding skirt is arranged vertically and located inside the reflective guide plate. The reflective guide plate and the flow guiding skirt form a flow channel for water distribution.

[0013] As a further aspect of this utility model, the inclined plate sedimentation device is characterized in that it is connected to the inner wall of the sedimentation tank body via an inclined plate support.

[0014] As a further embodiment of this utility model: the inclined plate sedimentation device includes multiple inclined plates arranged at an angle, the multiple inclined plates are arranged in parallel, the spacing between the inclined plates is 10-20cm, and the angle between the inclined plates and the water surface is 60°.

[0015] As a further embodiment of this utility model, the upper end of the inclined plate is inclined toward the direction of the water distribution channel.

[0016] As a further embodiment of this utility model: a sludge scraping device is provided on the upper part of the sedimentation tank body, and the sludge scraping device is located above the inclined plate sedimentation device.

[0017] As a further embodiment of this utility model: a sludge discharge channel is provided on one side of the main body of the sedimentation tank, and the lower end of the sludge discharge channel is connected to the sludge tank through a sludge discharge pipe, and a hydraulic sludge discharge valve is provided on the sludge discharge pipe.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] This application enhances the sludge-water separation effect by adding inclined plates in the sludge-water separation zone, resulting in a reduction of suspended solids in the effluent. Under the same design water volume and quality, the effluent indicators are superior. With the same sedimentation tank design size and effluent indicators, the treatment load, including both water volume and sludge load, can be increased. Due to the sedimentation effect of the inclined plates, the maximum upper limit of the sludge return ratio can be increased when adjusting the sedimentation tank sludge return ratio. During operation, the sludge return ratio can be flexibly adjusted within a wider range according to the operating conditions, avoiding the impact of high sludge return ratios on the bottom sludge being washed up, thus affecting the effluent suspended solids value. When designing the inlet baffle of the perimeter-inlet / perimeter-outlet sedimentation tank, hydraulic conditions and effluent water quality are taken into consideration. Generally, the length of the inlet baffle is within a certain range. If it is too short, it cannot separate the inlet and outlet zones, causing a short circuit and affecting the effluent water quality. If it is too long, it does not improve the treatment effect but increases costs. Adding inclined plates can reduce the length of the inlet baffle to a certain extent, thus improving the effluent suspended solids treatment effect and reducing costs. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main structure of this embodiment;

[0021] Figure 2 This is a schematic diagram of the inclined plate support structure in this embodiment;

[0022] 1-Sedimentation tank body, 2-Water distribution channel, 3-Inlet pipe, 4-Outlet channel, 5-Reflective guide plate, 6-Flow guide skirt, 7-Outlet weir plate, 8-Inclined plate sedimentation device, 9-Inclined plate support, 10-Sludge tank, 11-Sludge discharge pipe, 12-Hydraulic sludge discharge valve, 13-Sludge discharge channel, 14-Sludge scraping device. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-2In this embodiment of the present invention, a combined perimeter-inlet and perimeter-outlet sedimentation tank includes a sedimentation tank body 1, a water distribution channel 2 provided on the inner wall of the sedimentation tank body 1, an inlet pipe 3 provided at the bottom of the water distribution channel 2, and a flow guide provided at the outlet of the inlet pipe 3. In this embodiment, the sedimentation tank body 1 has a rectangular structure, the water distribution channel 2 is located on one side of the inner wall of the sedimentation tank body 1, and the flow guide includes a reflective guide plate 5 and a flow guide skirt 6 located below the water distribution channel 2. The reflective guide plate 5 is horizontally arranged and fixedly connected to the inner wall of the sedimentation tank body 1, and the flow guide skirt 6 is vertically arranged and located inside the reflective guide plate 5. The reflective guide plate 5 and the flow guide skirt 6 form a flow channel for water distribution. An outlet channel 4 is provided inside the water distribution channel 2, and an outlet weir plate 7 is provided inside the outlet channel 4.

[0025] An inclined plate sedimentation device 8 is installed inside the sedimentation tank body 1. The inclined plate sedimentation device 8 is connected to the inner wall of the sedimentation tank body 1 through an inclined plate support 9. The inclined plate sedimentation device 8 includes multiple inclined plates arranged at an angle. The multiple inclined plates are arranged in parallel with a spacing of 10-20cm between them. The angle between the inclined plates and the water surface is 60°. The upper end of the inclined plates is inclined towards the water distribution channel 2. A sludge scraping device 14 is installed on the upper part of the sedimentation tank body 1. The sludge scraping device 14 is located above the inclined plate sedimentation device 8.

[0026] The sedimentation tank body 1 has a sludge trough 10 at the bottom, and the sludge trough 10 is connected to a sludge discharge section. A sludge discharge channel 13 is provided on one side of the sedimentation tank body 1. The lower end of the sludge discharge channel 13 is connected to the sludge trough 10 through a sludge discharge pipe 11. A hydraulic sludge discharge valve 12 is provided on the sludge discharge pipe 11.

[0027] In use, the wastewater to be treated enters the inlet pipe 3 through the distribution channel 2 and then enters the sedimentation tank body 1. The reflective guide plate 5 and the guide skirt 6 set below the inlet pipe 3 can guide the water to be evenly distributed, avoid short-circuiting of the water flow, and improve the mud-water separation effect. The wastewater undergoes further mud-water separation inside the sedimentation tank. At the same time, due to the function of the inclined plate sedimentation device 8, the maximum upper limit of the sludge return ratio can be increased when adjusting the sludge return ratio of the sedimentation tank. During operation, the sludge return ratio can be flexibly adjusted within a wider range according to the operating conditions, avoiding the sludge at the bottom of the tank being flushed up when the sludge return ratio is high, which would affect the suspended solids value of the effluent. The sludge scraping device 14 above the sedimentation tank can further remove the scum on the upper part of the sedimentation tank. The sludge at the bottom enters the sludge discharge channel 13 through the sludge trough 10 and the sludge discharge pipe 11 and is finally discharged. The supernatant enters the effluent channel 4 through the effluent weir plate 7 and is finally discharged from the sedimentation tank body 1.

[0028] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0029] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A combined perimeter inlet and perimeter outlet sedimentation tank, comprising a sedimentation tank body (1), characterized in that, The sedimentation tank body (1) has a water distribution channel (2) on its inner wall, an outlet channel (4) on the inner side of the water distribution channel (2), an inlet pipe (3) at the bottom of the water distribution channel (2), a guide section at the outlet of the inlet pipe (3), and an outlet weir plate (7) on the inner side of the outlet channel (4). An inclined plate sedimentation device (8) is installed inside the main body (1) of the sedimentation tank; The sedimentation tank body (1) is provided with a sludge trough (10) at the bottom, and the sludge trough (10) is connected to a sludge discharge section.

2. The combined perimeter-inlet and perimeter-outlet sedimentation tank according to claim 1, characterized in that, The sedimentation tank body (1) has a rectangular structure, and the water distribution channel (2) is located on the inner wall of one side of the sedimentation tank body (1).

3. The combined perimeter-inlet and perimeter-outlet sedimentation tank according to claim 1, characterized in that, The flow guiding section includes a reflective guide plate (5) and a flow guiding skirt (6) located below the water distribution channel (2). The reflective guide plate (5) is arranged horizontally and fixedly connected to the inner wall of the sedimentation tank body (1). The flow guiding skirt (6) is arranged vertically and located inside the reflective guide plate (5). The reflective guide plate (5) and the flow guiding skirt (6) form a flow channel for water distribution.

4. A combined perimeter-inlet and perimeter-outlet sedimentation tank according to claim 1, characterized in that... The inclined plate sedimentation device (8) is connected to the inner wall of the sedimentation tank body (1) through the inclined plate support (9).

5. A combined perimeter-inlet and perimeter-outlet sedimentation tank according to claim 4, characterized in that, The inclined plate sedimentation device (8) includes multiple inclined plates arranged at an angle, the multiple inclined plates are arranged in parallel, the spacing between the inclined plates is 10-20cm, and the angle between the inclined plates and the water surface is 60°.

6. A combined perimeter-inlet and perimeter-outlet sedimentation tank according to claim 5, characterized in that, The upper end of the inclined plate is inclined toward the water distribution channel (2).

7. A combined perimeter-inlet and perimeter-outlet sedimentation tank according to claim 4, characterized in that, A sludge scraping device (14) is provided on the upper part of the sedimentation tank body (1), and the sludge scraping device (14) is located above the inclined plate sedimentation device (8).

8. A combined perimeter-inlet and perimeter-outlet sedimentation tank according to claim 1, characterized in that, A sludge discharge channel (13) is provided on one side of the sedimentation tank body (1). The lower end of the sludge discharge channel (13) is connected to the sludge tank (10) through a sludge discharge pipe (11). A hydraulic sludge discharge valve (12) is provided on the sludge discharge pipe (11).

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