A pool-top return sludge distribution pipe

Abstract

A pool top type backflow sludge distribution pipe channel relates to the sewage treatment technical field, including sewage treatment pool and sludge backflow pipe, still including the backflow sludge distribution pipe channel of setting in the sewage treatment pool pool top and being connected with sludge backflow pipe. The distribution pipe channel is constituted by at least one sludge distribution open channel, and a plurality of sludge distribution heads are mounted on the surface of the sludge distribution open channel. The side wall of the sludge distribution open channel is provided with sludge distribution head mounting holes for mounting the sludge distribution heads, one end of the sludge distribution head is connected with the mounting hole, and the other end is inclined to extend to the bottom of the pool with a preset slope of 3‰, so that the backflow sludge is injected into the pool from the area above the pool top of the sewage treatment pool by the sludge distribution heads under the action of gravity. This arrangement can utilize gravity flow to reduce energy consumption, and can also avoid the problem of easy clogging of sludge distribution at the bottom of the pool. The pipe wall surface of the sludge distribution head is provided with sludge distribution openings, and the diameter of the sludge distribution openings gradually decreases along the sludge flow direction. The tapered structure is beneficial to maintaining the balance of the sludge discharge pressure of each sludge distribution opening and realizing the uniform distribution of backflow sludge.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, specifically a top-mounted return sludge distribution pipe channel. Background Technology

[0002] With the acceleration of urbanization and industrial development, wastewater treatment has become a core aspect of ecological protection. As the mainstream process, the uniformity of sludge return distribution, a crucial element, directly affects COD removal rate and nitrogen removal efficiency. Current AAO and oxidation ditch processes generally rely on bottom perforated pipes or sidewall distributors for sludge distribution.

[0003] However, the bottom mud layer has weak anti-clogging ability, and the perforated pipe is easily blocked by sediment, requiring frequent cleaning.

[0004] Meanwhile, its flow control dimension is singular, and sludge can only spread from bottom to top, with vertical sludge diffusion restricted. Low-activity zones are easily formed in the upper part of the tank, while significant accumulation occurs at the bottom.

[0005] Lateral sludge distribution can lead to uncontrolled flow in the wide tank, and the distribution of return sludge has a significant longitudinal concentration gradient, resulting in uneven distribution of return sludge in the reaction tank.

[0006] If a multi-point mud distribution system is used, a complex diversion structure is required, which necessitates additional diversion valves, making the structure more complex and resulting in higher operation and maintenance costs. Summary of the Invention

[0007] To address the aforementioned issues, this application proposes a top-mounted return sludge distribution pipe system.

[0008] A top-mounted sludge return distribution pipeline includes a wastewater treatment tank and a sludge return pipe, and further includes a sludge return distribution pipeline located above the top of the wastewater treatment tank and connected to the sludge return pipe. The distribution pipeline consists of at least one open sludge distribution channel, with multiple extended sludge distribution heads installed on its surface.

[0009] In a further technical solution, the sidewall of the sludge distribution channel is provided with mounting holes for extending sludge distribution heads. One end of the extending sludge distribution head is connected to the mounting hole, and the other end extends towards the bottom of the tank at a preset slope of 3‰. This allows the returned sludge to be injected into the wastewater treatment tank from multiple points above the top of the tank under the action of gravity through the extending sludge distribution heads. This arrangement can reduce energy consumption by utilizing gravity flow, while avoiding the problem of easy clogging of the sludge distribution head at the bottom of the tank. Sludge distribution openings are formed on the surface of the extending sludge distribution head, and their diameter gradually decreases along the direction of sludge flow. This tapering structure helps to maintain a balanced sludge discharge pressure at each sludge distribution opening, achieving uniform distribution.

[0010] In a further technical solution, the sludge distribution channel also includes a sludge buffer zone located near the sludge return pipe and a connected sludge distribution zone. The large volume of the sludge buffer zone can effectively stabilize the hydraulic state of the incoming sludge and prevent impact on the distribution zone.

[0011] In a further technical solution, the cross-sectional width of the sludge distribution channel gradually decreases from the sludge buffer zone to the sludge distribution zone. The gradually decreasing cross-sectional width helps to maintain a stable sludge flow velocity in the channel and prevents sludge deposition.

[0012] In a further technical solution, the sludge distribution area consists of multiple interlocking first and second pipe channels, facilitating processing, transportation, and installation, and adapting to different tank sizes. The edges of the connections are equipped with matching grooves and protrusions, ensuring the sealing and structural integrity of the pipe connections.

[0013] In a further technical solution, a first connector and a second connector are installed on the outer surface of the sidewall of the first pipe channel. The first connector is connected to one end of a horizontal fixing member, and the other end of the horizontal fixing member is fixedly connected to the wall of the sewage treatment tank, providing the main horizontal support. The second connector is connected to one end of a diagonal fixing member, and the other end of the diagonal fixing member is connected to a fixing member installed at the top of the sidewall of the sewage treatment tank, thereby forming a triangular stable body with the horizontal fixing member and the sidewall of the pipe channel, enhancing the stability and vibration resistance of the open channel system during long-term operation.

[0014] In a further technical solution, multiple baffles are installed on the inner surface of the sludge distribution channel, making the sludge flow path "S" shaped, which prolongs the sludge flow path in the channel, promotes sludge mixing and homogenization, and avoids short-circuiting.

[0015] In a further technical solution, the return sludge distribution pipe is equipped with a water distributor or water tank. The outlet pipe of the water distributor or water tank extends into the internal flow channel of the sludge distribution channel to flush the flow channel and prevent sludge blockage.

[0016] In a further technical solution, a sludge distribution valve is installed at the end of the extended sludge distribution head furthest from the sludge distribution channel. This valve is used to precisely control the flow rate of sludge inside each extended sludge distribution head, enabling flexible adjustment of the sludge dosage in different areas of the tank. A sludge return valve is also installed at one end of the sludge distribution channel connected to the sludge return pipe for flow regulation and maintenance shut-off of the main pipeline. The other end is fixedly connected to the wall of the wastewater treatment tank, ensuring the stability of the overall structure.

[0017] Its working principle is based on a combination of gravity flow and multi-point sludge distribution. Through an elevated open channel structure and an inclined arrangement of extended sludge distribution heads, sludge is uniformly injected into the reaction tank from the top. The tapered design of the sludge distribution port and the layout of baffles within the open channel further optimize the flow pattern, ensuring uniform longitudinal and lateral diffusion of sludge within the tank, effectively eliminating dead zones, improving the contact efficiency between sludge and wastewater, and thus enhancing the treatment effect.

[0018] The working process is as follows: Returned sludge is transported through the sludge return pipe. After the total flow rate is controlled by the return sludge valve, it first enters the sludge buffer zone at the front end of the sludge distribution channel, where the flow velocity decreases and the flow pattern stabilizes. Subsequently, the sludge enters the sludge distribution zone, which is formed by the interlacing of the first and second pipes. In the "S"-shaped flow channel formed by baffles, it is further thoroughly mixed and distributed. Energy dissipation during the flow process helps release air bubbles and avoids air resistance. Finally, the uniformly mixed sludge is injected into the surface water of the wastewater treatment tank through the extended sludge distribution heads at an angle downwards. The sludge discharge rate at each point can be adjusted by operating the sludge distribution valve. The tapering structure of the sludge distribution port ensures uniform sludge discharge even when the flow rate changes. Under gravity, the sludge naturally settles and is evenly distributed throughout the tank volume, providing a uniformly distributed microbial community and substrate for the microorganisms in the tank, significantly improving the efficiency of the biochemical reaction and the operational stability of the treatment system.

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

[0020] By moving the sludge distribution system from the bottom of the tank to above the top and injecting it at an angle through extended sludge distribution heads, the sludge falls freely under gravity, avoiding the problems of bottom sediment flooding and clogging of the sludge distribution inlet. Furthermore, the structure eliminates the need for complex bottom-submerged diversion valves, significantly reducing the risk of clogging and the required maintenance, thereby lowering operation and maintenance costs.

[0021] By injecting sludge from multiple points at the top of the tank through multiple extended sludge nozzles, uniform distribution was first achieved on the horizontal plane. Secondly, after being injected from the top, the sludge naturally settled under gravity, forming a vertical flow from top to bottom, thus achieving uniform diffusion of the sludge within the three-dimensional space of the reaction tank. This effectively eliminated the dead zones and concentration gradients between the upper and lower parts of the tank, ensuring thorough mixing of the returned sludge with the wastewater, thereby significantly improving COD removal rate and denitrification efficiency.

[0022] The flow rate is naturally distributed by utilizing the "S"-shaped flow channel formed by the tapering cross-section and internal baffles of the sludge distribution channel. The tapering design of the sludge inlet further balances the sludge discharge pressure at various points, thus achieving uniform distribution. The distribution mechanism relies on the fluid's own dynamic characteristics, rather than multiple electrically operated valves, resulting in a simple structure, requiring no additional energy for operation, and ensuring reliable performance. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 A three-dimensional structural diagram of the top-mounted sludge return distribution pipeline.

[0025] Figure 2 for Figure 1 Enlarged view of section B;

[0026] Figure 3 Top view of the top-mounted sludge return distribution pipe network;

[0027] Figure 4 for Figure 3 Enlarged view of part A in the image;

[0028] Figure 5 Cross-sectional view of the top-mounted sludge return distribution pipe network;

[0029] Figure 6 This is a cross-sectional view of the top-mounted sludge return distribution pipe channel in Example 3;

[0030] Figure 7 This is a three-dimensional structural diagram of the first pipeline.

[0031] Figure 8 This is a top view of the first pipeline structure.

[0032] Figure 9 This is a top-down view of the structure of the first pipeline.

[0033] In the picture:

[0034] 1. Sewage treatment pond;

[0035] 2. Sludge return pipe;

[0036] 3. Sludge return valve;

[0037] 4. Sludge buffer zone;

[0038] 5. Sludge distribution area; 501. First pipe channel; 5011. Sludge head mounting hole for extended cloth; 5012. Groove; 5013. Boss; 502. Second pipe channel;

[0039] 6. Outward-extending mud-closing head; 601. Mud-closing inlet; 602. Mud-closing valve;

[0040] 7. Fasteners;

[0041] 8. Diagonal bracing;

[0042] 9. Auxiliary connectors;

[0043] 10. First connecting component;

[0044] 11. Second connector;

[0045] 12. Horizontal fasteners;

[0046] 13. Mud-covered open channel;

[0047] 18. Partition. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0049] The application principle of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0050] Example 1

[0051] like Figure 1-9 As shown, a top-mounted sludge return distribution pipeline includes a wastewater treatment tank 1 and a sludge return pipe 2. Its core feature is the sludge return distribution pipeline located above the top of the wastewater treatment tank 1 and connected to the sludge return pipe 2. This distribution pipeline consists of at least one open sludge distribution channel 13, with multiple extended sludge distribution heads 6 installed on its surface. The sidewall of the open sludge distribution channel 13 has mounting holes 5011 for the extended sludge distribution heads 6. One end of each extended sludge distribution head 6 is connected to the mounting hole, and the other end extends towards the bottom of the tank at a preset slope of 3‰. This allows the returned sludge to be injected into the wastewater treatment tank 1 from multiple points above the top under gravity through the extended sludge distribution heads 6. This arrangement utilizes gravity flow to reduce energy consumption and avoids the problem of easy clogging of the bottom sludge distribution.

[0052] The surface of the pipe wall of the extended sludge head 6 is provided with a sludge outlet 601. The diameter of the sludge outlet 601 gradually decreases along the sludge flow direction. This tapering structure helps to maintain the sludge discharge pressure of each sludge outlet and achieve uniform distribution.

[0053] Example 2

[0054] Based on Embodiment 1, a top-mounted return sludge distribution channel, the sludge distribution open channel 13, further includes a sludge buffer zone 4 located near the end of the sludge return pipe 2 and a sludge distribution zone 5 connected thereto. The larger volume of the sludge buffer zone 4 can effectively stabilize the hydraulic state of the incoming sludge and avoid impact on the distribution zone. The cross-sectional width of the sludge distribution open channel 13 gradually decreases from the sludge buffer zone 4 to the sludge distribution zone 5. This gradual reduction in cross-sectional width can maintain a stable sludge flow velocity within the channel and prevent sludge deposition. The return sludge distribution channel is equipped with a water distributor or a water tank. The outlet pipe of the water distributor or water tank extends into the internal flow channel of the sludge distribution open channel 13 to flush the flow channel and prevent sludge blockage.

[0055] The sludge distribution area 5 consists of multiple interlocking first pipe channels 501 and second pipe channels 502, which facilitates processing, transportation, and installation and adapts to different tank sizes. The edge surfaces of the connection points are provided with mutually matching grooves 5012 and bosses 5013, and sealing strips are installed at corresponding positions at the connection points to ensure the sealing of the connection between the pipe channels and the structural integrity. It also includes auxiliary connecting parts 9 for fixing the end of the sludge distribution channel 13 to the tank wall.

[0056] A first connector 10 and a second connector 11 are installed on the outer surface of the sidewall of the first pipe channel 501. The first connector 10 is connected to one end of the horizontal fixing member 12, and the other end of the horizontal fixing member 12 is fixedly connected to the wall of the sewage treatment tank 1, providing the main horizontal support. The second connector 11 is connected to one end of the diagonal fixing member 8, and the other end of the diagonal fixing member 8 is connected to the fixing member 7 installed at the top of the sidewall of the sewage treatment tank 1. Thus, the horizontal fixing member 12, the diagonal fixing member 8, and the sidewall of the first pipe channel 501 together form a triangular stable structure. This rigid support structure significantly enhances the stability and vibration resistance of the open channel system during long-term operation.

[0057] Multiple baffles 18 are installed on the inner surface of the sludge distribution channel 13. These baffles 18 extend alternately from the channel wall to opposite side walls, creating an "S"-shaped sludge flow path. This extends the sludge flow path within the channel, promoting mixing and homogenization, and preventing short-circuiting. A sludge distribution valve 602 is installed at the outlet end of the extended sludge distribution head 6. This valve adjusts the opening of the gap between itself and the inner wall of the extended sludge distribution head 6 to precisely control the sludge flow rate within each head, allowing for flexible adjustment of the sludge dosage in different areas of the tank. A sludge return valve 3 is also installed at one end of the sludge distribution channel 13 connected to the sludge return pipe 2. This valve is used for flow regulation and maintenance shut-off of the main pipeline. The other end of the valve is fixedly connected to the wall of the wastewater treatment tank 1, ensuring the stability of the overall structure.

[0058] The returned sludge is transported through the sludge return pipe 2. After the total flow rate is controlled by the returned sludge valve 3, it first enters the sludge buffer zone 4 at the front end of the sludge distribution channel 13, where the flow velocity decreases and the flow pattern tends to stabilize. Subsequently, the sludge enters the sludge distribution zone 5, which is composed of the first channel 501 and the second channel 502. In the "S"-shaped flow channel formed by the baffles 18, it is further fully mixed and distributed. The energy dissipation during the flow process helps to release air bubbles and avoid air resistance.

[0059] Finally, the uniformly mixed sludge is injected into the surface water of the wastewater treatment tank 1 through the extended sludge distribution heads 6 at an angle downwards. The sludge discharge rate at each point can be adjusted by operating the sludge distribution valve 602. The tapered structure of the sludge distribution port 601 ensures that the sludge discharge at each point remains uniform even when the flow rate changes. Under the action of gravity, the sludge naturally settles and is evenly distributed throughout the tank volume, providing a uniformly distributed microbial community and substrate for the microorganisms in the tank, significantly improving the efficiency of the biochemical reaction and the operational stability of the treatment system.

[0060] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the 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 the present invention.

[0061] 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 pool-top return sludge distribution pipe channel comprising a sewage treatment tank (1) and a sludge return pipe (2), characterized in that: It also includes a sludge return distribution pipe channel, which is set above the top of the sewage treatment tank (1) and connected to the sludge return pipe (2). The sludge return distribution pipe channel includes at least one sludge distribution channel (13) and multiple outward sludge distribution heads (6) installed on the surface of the sludge distribution channel (13). The side wall of the sludge distribution channel (13) is provided with multiple outward sludge distribution head mounting holes (5011) for installing the outward sludge distribution heads (6). One end of the outward sludge distribution head (6) is connected to the outward sludge distribution head mounting hole (5011), and the other end extends towards the side wall of the sewage treatment tank (1). The outward sludge distribution head (6) is arranged at a preset slope towards the bottom of the tank, so that the sludge return is injected into the sewage treatment tank (1) from multiple points above the top of the tank through the outward sludge distribution head (6) under the action of gravity. The wall of the extended sludge head (6) is provided with a sludge inlet (601), and the diameter of the sludge inlet (601) gradually decreases along the sludge flow direction.

2. A pool-top return sludge distribution pipe channel according to claim 1, wherein: The sludge distribution channel (13) includes a sludge buffer zone (4) and a sludge distribution zone (5). The sludge buffer zone (4) is located at one end of the sludge distribution channel (13) near the sludge return pipe (2). The cross-sectional width of the sludge distribution channel (13) gradually decreases from the sludge buffer zone (4) to the sludge distribution zone (5).

3. A pool-top return sludge distribution pipe channel according to claim 2, wherein: The sludge distribution area (5) is composed of multiple first pipe channels (501) and second pipe channels (502) connected alternately; at the end of the connection between the first pipe channel (501) and the second pipe channel (502), there are mutually cooperating grooves (5012) and bosses (5013).

4. A pool-top return sludge distribution pipe channel according to claim 3, wherein: A first connector (10) and a second connector (11) are installed on the outer surface of the side wall of the first pipe (501); the first connector (10) is connected to one end of a horizontal fixing member (12), and the other end of the horizontal fixing member (12) is fixed to the side wall of the sewage treatment tank (1); the second connector (11) is connected to one end of a diagonal fixing member (8), and the other end of the diagonal fixing member (8) is connected to a fixing member (7) set at the top of the side wall of the sewage treatment tank (1); the horizontal fixing member (12), the diagonal fixing member (8) and the side wall of the first pipe (501) together form a triangular stable structure.

5. A pool-top return sludge distribution pipe according to claim 1, wherein: The inner surface of the sludge distribution channel (13) is equipped with multiple baffles (18), which extend alternately from the channel wall to the opposite side wall, so that the sludge flow path is "S" shaped.

6. A pool-top return sludge distribution pipe according to claim 1, wherein: A sludge valve (602) is installed at the outlet end of the extended sludge head (6). The sludge valve (602) controls the outflow speed of sludge by adjusting the opening of the gap formed between itself and the inner wall of the extended sludge head (6).

7. A top-mounted sludge return distribution pipe network according to claim 1, characterized in that: One end of the mud distribution channel (13) is connected to the sludge return pipe (2), and a sludge return valve (3) is provided at the connection point; the other end of the mud distribution channel (13) is fixedly connected to the wall of the sewage treatment tank (1).

8. A pool-top return sludge distribution pipe according to claim 1, wherein: The slope is 3‰.

9. A pool-top return sludge distribution main according to claim 1 wherein: The backflow sludge distribution pipe is matched with a water distributor or a water tank, and the water outlet pipeline of the water distributor or the water tank extends into the internal flow channel of the sludge distribution open channel (13) for flushing the flow channel to prevent sludge blockage.

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