Rural sewage treatment equipment

Abstract

The utility model provides rural sewage treatment equipment. The rural sewage treatment equipment comprises an anaerobic tank, an aerobic tank and a sedimentation tank, a water inlet pipeline of the anaerobic tank extends to the bottom of the anaerobic tank, outlet water of the anaerobic tank enters the aerobic tank through an overflow pipe, the overflow pipe is arranged at an inclined upward angle, and a protruding part of the overflow pipe is positioned in the aerobic tank; and the sedimentation tank is a vertical flow type sedimentation tank. The equipment does not need mechanical stirring, is low in energy consumption and simple to maintain, and is suitable for small rural sewage treatment scenes.

Description

Technical Field

[0001] This utility model relates to the field of rural sewage treatment technology, and in particular to a rural sewage treatment device. Background Technology

[0002] Rural wastewater treatment plants face the following problems due to their small scale and limited operation and maintenance capabilities:

[0003] Anaerobic ponds lack effective stirring devices. Traditional mechanical stirring requires additional electricity and has high maintenance costs, while aeration stirring will destroy the anaerobic environment.

[0004] When the anaerobic tank and the aerobic tank are connected by a partition with openings, dissolved oxygen generated by aeration in the aerobic tank can easily enter the anaerobic tank, affecting the treatment effect.

[0005] The reflux system has complex piping and requires multiple sets of power equipment, which increases construction and operating costs. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a rural sewage treatment device. To achieve the above objectives, this utility model adopts the following technical solution:

[0007] A rural sewage treatment device includes an anaerobic tank, an aerobic tank, and a sedimentation tank; the inlet pipe of the anaerobic tank extends to the bottom of the anaerobic tank, and the effluent from the anaerobic tank enters the aerobic tank through a flow pipe, the flow pipe being arranged at an upward angle with its protruding part located in the aerobic tank; the sedimentation tank is a vertical flow sedimentation tank.

[0008] Furthermore, the water inlet pipe is centrally located and equidistant from the left and right walls of the anaerobic tank.

[0009] Furthermore, the bottom horizontal section of the inlet pipe extends close to the wall of the aerobic tank.

[0010] Furthermore, the water inlet pipe is 20cm away from the bottom of the anaerobic tank, and its bottom horizontal section is fixedly connected to the bottom of the tank through a support.

[0011] Furthermore, the portion of the water inlet pipe submerged below the liquid surface is made of high-density polyethylene, polyvinyl chloride, fiberglass, or stainless steel, and the support is a concrete base or a hot-dip galvanized metal bracket.

[0012] Furthermore, the bottom horizontal section of the water inlet pipe is perforated at a 45° angle downwards from the vertical direction, with perforations on both the left and right sides intersecting and the spacing between the perforations on each side being equal.

[0013] Furthermore, the perforation diameter of the water inlet pipe is 10mm, and the total perforation area is equal to the cross-sectional area of ​​the water inlet pipe.

[0014] Furthermore, the angle between the flow pipe and the horizontal position is 45°-60°.

[0015] Furthermore, the mixed liquor recirculation from the aerobic tank to the anaerobic tank and the sludge recirculation from the sedimentation tank to the anaerobic tank are both achieved through airlift power.

[0016] Furthermore, the mixed liquor recirculation and sludge recirculation share a single recirculation pipe.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The inlet pipe of the anaerobic tank extends to the bottom of the anaerobic tank, eliminating the traditional mechanical stirring device and using the impact force of the inlet water flow to achieve mud-water mixing;

[0019] 2. By setting the overflow pipe at an angle upward, with the outlet of the overflow pipe higher than the liquid surface of the anaerobic tank, a dual mechanism of "water seal + bubble interception" is formed. The dissolved oxygen bubbles generated by the aeration in the aerobic tank move upward due to buoyancy. The pipe wall of the angled overflow pipe blocks the bubbles from entering the anaerobic tank in the opposite direction, thus maintaining the anaerobic environment and improving the efficiency of nitrogen and phosphorus removal.

[0020] 3. The vertical flow sedimentation tank adopts a mature and standardized structure and is integrated with the anaerobic tank and aerobic tank. Compared with the traditional separate treatment facilities, it occupies less land and can be flexibly installed in the corners of villages. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0022] Figure 1 This is a schematic diagram of the transverse cross-section structure of an embodiment of the present utility model.

[0023] In the above attached diagram: 1. Anaerobic tank; 2. Aerobic tank; 3. Sedimentation tank; 4. Inlet pipe; 5. Flow pipe; 6. Guide pipe; 7. Support component; 8. Perforation; 9. Return pipe; 10. Air pump; 11. Outlet; 12. Air vent valve. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1As shown in the figure, this utility model embodiment proposes a rural sewage treatment device, including an anaerobic tank 1, an aerobic tank 2, and a sedimentation tank 3. The inlet pipe 4 of the anaerobic tank 1 extends to the bottom of the anaerobic tank 1, and the effluent from the anaerobic tank 1 enters the aerobic tank 2 through a flow pipe 5. The flow pipe 5 is arranged at an upward angle and its protruding part is located in the aerobic tank 2. The sedimentation tank 3 is a vertical flow sedimentation tank 3, and a vertical guide pipe 6 is set in the sedimentation tank 3. Sewage enters the inlet pipe 4 at the bottom of the anaerobic tank 1 through a lift pump, enters the tank through a horizontal section, and the water flow impact force drives the sludge to mix. The anaerobic effluent enters the aerobic tank 2 through the upward flow pipe 5, and the effluent from the aerobic tank 2 enters the vertical flow sedimentation tank 3 to complete the sludge-water separation. The settled water overflows from the outlet 11 of the sedimentation tank 3.

[0026] For ordinary rural domestic sewage with low corrosivity, inlet pipe 4 is made of HDPE or PVC-U pipe, using hot-melt butt welding or rubber sealing rings for flexible connection to ensure sealing. For highly corrosive sewage such as aquaculture wastewater and food processing wastewater, inlet pipe 4 is made of 316L stainless steel or FRP pipe. The stainless steel pipe surface is passivated to enhance corrosion resistance, and the FRP pipe has a vinyl ester resin inner layer and an anti-ultraviolet layer on the outer layer to adapt to outdoor installation environments. In cold rural areas, inlet pipe 4 is made of HDPE or fiberglass pipe, which has excellent freeze resistance. The stainless steel pipe is wrapped with insulation material such as polyurethane foam to prevent damage from freezing in winter.

[0027] In this embodiment, as Figure 1 As shown, the inlet pipe 4 is centrally located, with equal distances from the left and right walls of the anaerobic tank 1. This forms a "diagonal water distribution path," allowing wastewater to diffuse from one side of the tank bottom to the other, forcing the water to flow through the entire area of ​​the anaerobic tank 1. This avoids "short-circuiting" (water flowing directly to the outlet without reaction) and reduces the frequency of manual sludge removal.

[0028] In this embodiment, as Figure 1 As shown, the bottom horizontal section of the inlet pipe 4 extends close to the wall of the aerobic tank 2. The water flow impacts the entire bottom of the anaerobic tank 1, increasing the mixing effect.

[0029] In this embodiment, as Figure 1As shown, the inlet pipe 4 is 20cm from the bottom of the anaerobic tank 1, and its horizontal bottom section is fixedly connected to the tank bottom via support member 7. The portion of the inlet pipe 4 submerged below the liquid surface is made of high-density polyethylene, polyvinyl chloride, fiberglass, or stainless steel. The support member 7 is a concrete base or a hot-dip galvanized metal bracket. Rigid support prevents displacement and deformation of the pipe due to water flow impact or sludge compression. Concrete base is suitable for non-metallic pipes such as PVC-U and HDPE, and provides rigid support by fixing the pipe with pre-embedded bolts or concrete pouring. Hot-dip galvanized metal bracket is suitable for stainless steel or FRP pipes. The bracket surface is galvanized to prevent rust, and rubber gaskets are placed at the contact points with the pipe to avoid electrochemical corrosion (such as potential difference corrosion caused by stainless steel contacting iron).

[0030] In this embodiment, as Figure 1 As shown, the bottom horizontal section of the inlet pipe 4 has perforations 8 at a 45° angle downwards from the vertical, with perforations 8 spaced equidistantly on both sides. The diameter of the perforations 8 in the inlet pipe 4 is 10mm, and the total perforation area is equal to the cross-sectional area of ​​the inlet pipe 4. The downward-angled perforations generate a bidirectional impact force of downward and horizontal flow, while simultaneously impacting the bottom and walls of the pool to create reflected flow, enhancing the mixing effect. The crisscrossing perforations 8 prevent water flow concentration on one side, forming a "spiral upward mixing flow field." The total perforation area is equal to the pipe cross-sectional area, ensuring stable flow velocity and preventing excessive flow velocity from causing sludge erosion. Complete mixing and anaerobic reaction can be achieved without mechanical stirring.

[0031] In this embodiment, as Figure 1 As shown, the angle between the overflow pipe 5 and the horizontal position is 45°-60°. Utilizing the physical property of air bubbles rising (buoyancy > water resistance), the air bubbles generated by aeration in the aerobic tank 2 move upwards along the bottom of the inclined pipe and cannot flow back into the anaerobic tank 1. The protruding part of the overflow pipe 5 forms a "water seal buffer zone," further blocking the diffusion of dissolved oxygen. This improves the efficiency of nitrogen and phosphorus removal. The overflow pipe 5 is made of FRP or stainless steel, and its smooth inner wall reduces water flow resistance and prevents sludge adhesion and clogging.

[0032] In this embodiment, as Figure 1As shown, the mixed liquor recirculation from aerobic tank 2 to anaerobic tank 1 and the sludge recirculation from sedimentation tank 3 to anaerobic tank 1 are both achieved through air lift. The mixed liquor recirculation and sludge recirculation share a single recirculation pipe 9. When air bubbles rise in the air lift pipe, they create negative pressure in the liquid, drawing the mixed liquor from anaerobic tank 1 or the sludge from sedimentation tank 3 into the recirculation pipe 9. The two recirculation pipes 9 are combined into one. By connecting the recirculation pipes 9 located in aerobic tank 2 and sedimentation tank 3 to an air pump 10, the air lift is used to transport the fluids in both tanks in a timed or synchronous manner. An exhaust valve 12 is installed on the recirculation pipe 9. By using the recirculation pipe 9, the pipe length is reduced, pipe material costs are lowered, the system has high integration, and the footprint is reduced, making it suitable for the compact layout requirements of rural sites.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A rural sewage treatment device, characterized in that, It includes an anaerobic tank, an aerobic tank, and a sedimentation tank; the inlet pipe of the anaerobic tank extends to the bottom of the anaerobic tank, and the effluent from the anaerobic tank enters the aerobic tank through a flow pipe, the flow pipe being arranged at an upward angle with its protruding part located in the aerobic tank; the sedimentation tank is a vertical flow sedimentation tank.

2. The rural sewage treatment equipment as described in claim 1, characterized in that: The water inlet pipe is centrally located and is equidistant from the left and right walls of the anaerobic tank.

3. The rural sewage treatment equipment as described in claim 1, characterized in that: The bottom horizontal section of the inlet pipe extends to near the wall of the aerobic tank.

4. The rural sewage treatment equipment as described in claim 1, characterized in that: The water inlet pipe is 20cm away from the bottom of the anaerobic tank, and its bottom horizontal section is fixedly connected to the bottom of the tank by a support.

5. A rural sewage treatment equipment as described in claim 4, characterized in that: The portion of the inlet pipe submerged below the liquid surface is made of high-density polyethylene, polyvinyl chloride, fiberglass, or stainless steel, and the support is a concrete base or a hot-dip galvanized metal bracket.

6. The rural sewage treatment equipment as described in claim 1, characterized in that: The bottom horizontal section of the water inlet pipe has holes punched at a 45° angle downwards from the vertical direction, with holes intersecting on the left and right sides and equal spacing between holes on each side.

7. A rural sewage treatment equipment as described in claim 6, characterized in that: The diameter of the perforation in the water inlet pipe is 10mm, and the total area of ​​the perforation is equal to the cross-sectional area of ​​the water inlet pipe.

8. The rural sewage treatment equipment as described in claim 1, characterized in that: The angle between the flow pipe and the horizontal position is 45°-60°.

9. A rural sewage treatment device as described in claim 1, characterized in that: The mixed liquor recirculation from the aerobic tank to the anaerobic tank and the sludge recirculation from the sedimentation tank to the anaerobic tank are both achieved through airlift power.

10. A rural sewage treatment device as described in claim 9, characterized in that: The mixed liquor recirculation and sludge recirculation share a single recirculation pipe.

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