A multi-stage sewage treatment device for remote suburbs

Abstract

This invention relates to the field of wastewater treatment technology, specifically providing a multi-stage wastewater treatment device for remote suburbs. The device includes a pool body comprising a bottom, a top, walls, and an isolation wall. The bottom and top are made of flexible, impermeable material. The top has through-holes for connecting pipes. The walls are constructed of an air-supported membrane structure. The bottom and top are fixedly and sealed to the walls, which are located between the top and bottom. The isolation wall divides the interior of the pool body into multiple independent compartments. These compartments are arranged sequentially along the wastewater flow direction, and adjacent compartments are hydraulically connected through through-holes in the isolation wall. The air-supported membrane structure is hollow and filled with a pressurized medium. This invention effectively reduces the construction period and transportation costs of wastewater treatment devices.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a multi-stage wastewater treatment device for use in remote suburbs. Background Technology

[0002] In remote suburbs or rural areas, sewage is often far from urban wastewater treatment networks, resulting in direct discharge of domestic wastewater into natural water bodies, causing non-point source pollution and ecological degradation. Wastewater treatment in these areas typically involves the construction of small-scale, stand-alone treatment facilities for centralized treatment of domestic sewage.

[0003] Currently, wastewater treatment facilities used in remote suburbs are mainly divided into two categories: on-site construction and prefabrication. While on-site construction allows for flexible structural adjustments based on site conditions and treatment needs, it suffers from long construction cycles, high costs, and significant limitations imposed by the remoteness of the site, making rapid deployment difficult. To address the long construction period of on-site construction, prefabrication can be used for wastewater treatment in remote areas. Prefabricated wastewater treatment facilities are often integrated structures with fixed cavities, such as tanks or centralized box structures. These structures are often large and inconvenient to transport. To solve this problem, this application proposes a multi-stage wastewater treatment device for remote suburbs. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-stage sewage treatment device for use in remote suburbs, so as to solve the problem that the current prefabricated sewage treatment devices are inconvenient to transport.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A multi-stage wastewater treatment device for remote suburbs includes a pool body containing multiple compartments connected by pipes. The pool body includes: The pool bottom and the pool top are both made of flexible, waterproof material, and the pool top is provided with a through-hole structure for connecting pipes; The pool wall is composed of an air film wall. The pool bottom and the pool top are fixedly and sealed to the pool wall. The pool wall is located between the pool top and the pool bottom. The pool wall, the pool top, and the pool bottom constitute a hollow, closed cavity structure. The isolation wall divides the interior of the cavity into multiple independent compartments. The isolation wall is an air-supported membrane wall structure. The compartments are arranged sequentially along the sewage flow direction, and adjacent compartments are hydraulically connected through through holes in the isolation wall. The air film wall has a hollow internal structure and is filled with a pressure medium.

[0006] Furthermore, the pool wall is annular, with an annular wall on its inner side. The annular gap between the annular wall and the pool wall is divided into multiple fan-shaped compartments by a straight plate wall. Adjacent compartments are connected by through holes provided on the straight plate wall. The annular wall and the straight plate wall constitute the isolation wall.

[0007] Furthermore, each sector-shaped chamber is divided into an anaerobic chamber, an aerobic chamber, and a sedimentation chamber according to its function. The chamber enclosed by the annular wall is a sludge chamber. The anaerobic chamber, aerobic chamber, and sedimentation chamber are all connected to the sludge chamber through a pipeline structure.

[0008] Furthermore, the pool body includes: A sludge discharge device, the input end of which is connected to the bottom of the sludge bin, and the output end of which is connected to the outside, for discharging sludge from the sludge bin.

[0009] Furthermore, the anaerobic chamber, aerobic chamber, and sedimentation chamber are all connected to the sedimentation chamber via siphon pipes. The siphon pipe is a U-shaped pipe, and the height of the top of its vertical section decreases sequentially according to the order of the anaerobic chamber, the aerobic chamber, and the sedimentation chamber. The water inlet end of the siphon pipe is located at the bottom of the corresponding chamber to adsorb sludge. The top of the siphon pipe is provided with a siphon breaking opening, which is a through hole opened on the wall of the siphon pipe.

[0010] Furthermore, the pipes connecting adjacent compartments are equipped with control valves to control the connection or closure between the compartments.

[0011] Furthermore, the bottom of the sludge bin protrudes beyond the bottom of the pool, so that the bottom depth of the sludge bin after installation is greater than the bottom depth of the other bins.

[0012] Furthermore, the pool also includes: A first frame is fixedly connected to the pool wall and surrounds it to strengthen the circumferential strength of the pool wall. The second frame connects the pool wall and the isolation wall, and is used to increase the connection strength between the pool wall and the isolation wall.

[0013] Furthermore, the first frame and the second frame are formed by connecting rigid rods end to end, and adjacent rigid rods are connected by connectors.

[0014] Preferably, the pressure medium is water.

[0015] In summary, the present invention has the following advantages compared with the prior art: The multi-stage sewage treatment device for remote suburbs disclosed in this invention uses an air-film wall filled with a pressurized medium to form the pool of the sewage treatment device. When constructing the pool, there is no need for on-site casting or welding. Deployment can be completed simply by unfolding the flexible pool and filling it with the pressurized medium. At the same time, the pool can be rolled up and folded during transportation, which significantly reduces the transportation volume and cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a multi-stage sewage treatment device for remote suburbs disclosed in Embodiment 1 of the present invention.

[0017] Figure 2 This is a front view of the multi-stage sewage treatment device for remote suburbs disclosed in Embodiment 1 of the present invention.

[0018] Figure 3 for Figure 2 Sectional view of AA.

[0019] Figure 4 This is a schematic diagram of the internal structure of a multi-stage sewage treatment device for remote suburbs disclosed in Embodiment 1 of the present invention.

[0020] Figure 5 This is a schematic diagram of the siphon pipe in a multi-stage sewage treatment device for remote suburbs, as disclosed in an embodiment of the present invention.

[0021] Figure 6 This is a schematic diagram of the right-angled pipe structure in a multi-stage sewage treatment device for remote suburbs disclosed in an embodiment of the present invention.

[0022] Figure 7 This is a schematic diagram of the sewage discharge component in a multi-stage sewage treatment device for remote suburbs, as disclosed in an embodiment of the present invention.

[0023] Figure 8 for Figure 7 A magnified view of a section at point I.

[0024] Figure 9 This is a schematic diagram of the internal structure of a multi-stage sewage treatment device for remote suburbs disclosed in Embodiment 2 of the present invention.

[0025] Figure 10 This is a schematic diagram of the arc-shaped frame structure in a multi-stage sewage treatment device for remote suburbs disclosed in an embodiment of the present invention.

[0026] Figure 11 for Figure 10 A magnified view of a section at point II.

[0027] Figure 12 for Figure 10 A magnified view of a section at point III.

[0028] Figure label: 100. Tank body; 101. Anaerobic tank; 102. Aerobic tank; 103. Sedimentation tank; 104. Clear water tank; 105. Sludge tank; 110. Tank bottom; 111. Semi-tank body; 120. Tank top; 130. Tank wall; 131. First connecting sleeve; 140. Isolation wall; 141. Circular wall; 142. Straight plate wall; 143. Second connecting sleeve; 200. Sewage discharge component; 210. Sewage pipe ; 211, Grid hole; 212, Sewage outlet; 220, Spiral lifting shaft; 230, Lifting motor; 240, Motor bracket; 300, Siphon tube; 301, Broken siphon; 400, Right-angle tube; 500, Control valve; 600, Support component; 601, Rigid rod; 602, Connector; 603, Connecting groove; 610, First frame; 620, Second frame; 630, Third frame. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0030] Example 1: Figures 1 to 4 As shown, an embodiment of the present invention provides a multi-stage sewage treatment device for suburban areas. The multi-stage sewage treatment device includes a pool body with multiple chambers connected by pipes. The pool body includes a bottom, a top, a wall, and an isolation wall. The bottom and top are made of flexible, impermeable material. The top has a through-hole structure for connecting pipes (not shown in the figure). The wall is made of an air-supported membrane structure. The bottom and top are fixedly and sealed to the wall. The wall is located between the top and bottom, forming a hollow, closed cavity structure. The isolation wall divides the cavity into multiple independent chambers. The isolation wall is an air-supported membrane structure. The chambers are arranged sequentially along the sewage flow direction, and adjacent chambers are hydraulically connected through through-holes in the isolation wall. The air-supported membrane structure is hollow and filled with a pressure medium.

[0031] Specifically, in this embodiment, the pool body and the pool top adopt a multi-layer composite membrane structure. The outer layer is a corrosion-resistant and waterproof layer, and the middle layer is a high-strength reinforcing layer. Overall, it has an anti-seepage function. As in this embodiment, the materials of the pool bottom, from the inside out, are: HDPE geomembrane (high-density polyethylene membrane), polyester filament needle-punched geotextile, HDPE geomembrane, and geotextile protective layer (short-fiber needle-punched nonwoven geotextile). The four-layer structure is integrally formed by a hot-pressing composite process. The pool top also adopts a four-layer composite membrane structure, corresponding to the material layers of the pool bottom.

[0032] The pool wall adopts a composite membrane structure, with the innermost layer consisting of a PVDF-coated polyester fiber membrane, a polyester filament needle-punched nonwoven geotextile, a TPU thermoplastic polyurethane airtight membrane, and a hydrophilic modified biocompatible polyurethane membrane, forming a four-layer membrane structure integrally through a high-frequency heat sealing process. The structure of the isolation wall is consistent with that of the pool wall.

[0033] The pool bottom, pool top, pool walls, and the joints between the pool walls are sealed using high-frequency heat sealing to ensure overall airtightness and watertightness.

[0034] Both the pool wall and the isolation wall adopt a cylindrical capsule structure, which is composed of multiple vertically arranged cylindrical capsules connected together. The capsules are formed by discontinuous welding. Taking the pool wall as an example, the pool wall structure with vertical welds is divided into multiple vertical capsule structures, and the capsules are connected to each other.

[0035] Preferably, the weld seams of each capsule can adopt a double-seam structure to improve the reliability of the connection.

[0036] The inflatable tank is prefabricated and assembled in the factory. During construction, the prefabricated tank is transported to the site and filled with a pressurized medium (such as water or air). The air-supported membrane wall expands to form the tank. If underground installation is used, a foundation pit is first excavated, then the inflated tank is hoisted into the pit. Accessories such as inlet / outlet pipes, return pipes, aeration systems, and intelligent monitoring sensors are then installed. Backfilling and compaction are then performed to ensure a tight seal between the air-supported membrane wall and the surrounding soil. The intelligent monitoring system is then networked and debugged. If ground installation is used, the inflatable tank is placed directly on a hardened foundation, with windproof anchoring and sunshade / insulation devices added. After the accessories are installed using a support structure, it is ready for operation. This device offers advantages such as rapid deployment, no civil engineering required, and reusability.

[0037] It should be noted that the material of the pool body can be flexibly adapted according to the actual installation process. For example, for underground installations, the outer layer of the pool body is made of a corrosion-resistant material, while for ground installations, the focus is on resistance to ultraviolet rays and mechanical wear, while also taking into account the response to thermal expansion and contraction under different climatic conditions and long-term service stability. For instance, in East China, where summers are hot and rainy, the outer PVDF coating of the pool body needs to be thickened to 25μm to enhance its resistance to ultraviolet aging. In winter, when temperatures are low, 5% to 8% of a flexible toughening agent needs to be added to the TPU airtight membrane to ensure that the membrane remains flexible and does not crack even at -20℃. In the arid Northwest, it is necessary to strengthen the wind and sand resistance and temperature difference deformation resistance. The thickness of the outer PVDF coating is increased to 30μm, and a nano-silica reinforcement layer is added to improve the wear resistance of the membrane surface. In the frigid Northeast, 10% to 12% of cold-resistant polyether polyol is introduced into the TPU airtight membrane to ensure that the membrane material still has excellent resilience and tear resistance under extreme cold conditions of -40℃. In the humid and hot South China, it is necessary to simultaneously strengthen the resistance to mold and moisture resistance. The outer PVDF coating needs to be supplemented with antibacterial agents and composite with a moisture-proof silicone microporous layer to ensure long-term service without failure in high humidity and high salt environments.

[0038] As a preferred embodiment of this example, Figure 4 As shown, the pool wall is annular, with an inner annular wall. The annular gap between the annular wall and the pool wall is divided into multiple sector-shaped chambers by a straight plate wall. Adjacent chambers are connected by through holes in the straight plate wall. The annular wall and the straight plate wall constitute the isolation wall. Each sector-shaped chamber is functionally divided into an anaerobic chamber, an aerobic chamber, a sedimentation chamber, and a clear water chamber. The chamber enclosed by the annular wall is a sludge chamber. The anaerobic chamber, aerobic chamber, and sedimentation chamber are all connected to the sludge chamber via a pipe structure.

[0039] Specifically, both the annular wall and the pool wall are annular and concentrically arranged. The ends of the annular wall are fixedly connected to the pool bottom and the pool top, respectively, forming a closed sludge chamber. The four sides of the straight plate wall are fixedly connected to the annular wall, the pool wall, the pool bottom, and the pool top, respectively, ensuring complete isolation of each sector-shaped chamber. It should be noted that the straight plate wall, annular wall, and pool wall all employ a double-redundant process of hot-melt welding and sealant to improve sealing reliability, long-term impermeability, and connection strength. The clear water chamber and the anaerobic chamber are isolated to prevent communication between them.

[0040] In this embodiment, the pool wall, annular wall, and straight plate wall can be manufactured by integral welding, such as by first completing the main structure splicing and then welding the air film wall. This method facilitates improved welding strength, welding convenience, and control over the overall connectivity of the air film wall structure inside the pool.

[0041] like Figures 4 to 6As shown, the annular wall and the pool wall, arranged counterclockwise, form an anaerobic chamber, an aerobic chamber, a sedimentation chamber, and a clear water chamber. These chambers are connected by right-angled pipes. The horizontal end of each pipe extends into the upper part of the preceding chamber, while the vertical end extends into the lower part of the following chamber, ensuring unidirectional water flow along a predetermined path. This structure also utilizes overflow to achieve hydraulic propulsion, avoiding short-circuiting and dead zones. The right-angled pipes are arranged in a stepped layout, gradually decreasing in height from the anaerobic chamber to the clear water chamber, ensuring a stable propulsive force due to the water level difference between the chambers.

[0042] The anaerobic, aerobic, and sedimentation chambers are connected to the sludge chamber via a U-shaped siphon pipe. One end of the siphon pipe is located at the bottom of each of the anaerobic, aerobic, and sedimentation chambers, while the other end extends to the lower middle part of the sludge chamber. Automatic sludge recirculation is achieved using the liquid level difference. A sluice gate is provided at the top of the siphon pipe to automatically stop the siphon when the liquid level is below the sluice gate, preventing excessive water from flowing into the sludge chamber. The height of the sluice gate is calculated to ensure that the liquid level in the anaerobic, aerobic, and sedimentation chambers is maintained at a preset height. The siphon pipe is stepped, with its height decreasing progressively from the anaerobic, aerobic, and sedimentation chambers to prevent sludge discharge from downstream chambers from interfering with upstream chambers.

[0043] Preferably, in this embodiment, the height of the horizontal end of the right-angle pipe is lower than the height of the siphon opening in the current chamber, ensuring that the water flow will not trigger a siphon during normal flow. However, when the system experiences a sudden high load or an abnormal rise in liquid level, the siphon opening is submerged, and the siphon automatically starts. This method allows the sludge chamber to not only perform the conventional sludge storage function but also act as a buffer chamber when the system is overloaded. Reinforcing rings are provided at the openings on the straight plate wall and the annular wall. The reinforcing rings are tubular structures that are firmly bonded to the wall surface by adhesive and tightly nested with the internal pipes to form rigid support nodes.

[0044] Preferably, in this embodiment, a control valve is also provided on the horizontal section of the right-angle tube. The control valve is an underwater electric regulating valve that supports remote and precise adjustment of the opening degree. It is used to control the water flow rate in each compartment, thereby controlling the liquid level in each compartment. The control valve is controlled by the control system of the sewage treatment system. The control valve is a pipeline solenoid valve in the prior art. The control valve is externally covered with a corrosion-resistant and waterproof structure, such as a waterproof membrane or waterproof coating, to prevent leakage, short circuit, etc. caused by long-term operation underwater.

[0045] The top of the pool is equipped with access ports corresponding to each compartment. The inner diameter of each access port must be large enough to allow a technician to enter and exit vertically, and the edges are equipped with anti-slip textures and sealing rings. The access ports are made of plastic to prevent them from being too heavy. The access ports employ multiple redundant sealing structures such as sealing rings, threads, and clamps. For example, if the access port is circular, the cover plate is a flat groove. A sealing ring is provided between the cover plate and the port of the access port. The inside of the cover plate is tightly engaged with the port through threads, and the outside is supplemented with stainless steel clamps to achieve secondary locking and improve the sealing ability. At the same time, the access ports facilitate the entry and exit of installation personnel into the compartments, making installation convenient.

[0046] In a preferred embodiment of this work, the bottom of the sludge bin protrudes beyond the bottom of the pool, so that the bottom depth of the sludge bin after installation is greater than the bottom depth of the other bins. Specifically, as shown... Figure 3 As shown, a semi-compartment is provided on the bottom of the pool. The semi-compartment is a groove structure set on the bottom of the pool. The material of the semi-compartment is the same as that of the bottom of the pool. The semi-compartment is fixedly connected to the bottom of the pool by welding. In this embodiment, the pool is buried underground. During construction, a groove to accommodate the semi-compartment is dug at the bottom of the foundation pit. The semi-compartment is set to increase the height difference between each compartment and the sludge compartment, thereby enhancing the gravity sludge discharge effect, improving the volume utilization rate of the sludge compartment, reducing the interference of sludge deposition on other compartments, and increasing the buffering capacity when the water flow is unstable.

[0047] The pressure medium can be air or water. When air is used, compressed air is injected into the air membrane wall by an air pump, causing the air membrane wall to expand and form a wall structure. The pressure increases its overall rigidity and resistance to deformation. When water is used as the pressure medium, clean water is injected into the water membrane wall by a water pump. The incompressibility of water provides stable support. At the same time, the density of clean water is similar to that of sewage, which can increase the rigidity of the air membrane wall and reduce pressure deformation.

[0048] Preferably, the tank also includes a medium replenishment structure. For example, when air is used as the pressure medium, an air pump, an air valve, and a pressure sensor are used as the medium replenishment structure. The pressure sensor is located at the top of the tank wall and monitors the pressure changes within the air-film wall in real time. When the pressure falls below a set threshold, the air pump automatically starts to replenish the pressure, and the air valve simultaneously opens to connect the air path. After replenishment is complete, the air valve closes. When water is used as the pressure medium, the medium replenishment structure consists of a water pump, a valve, and a pressure sensor. The pressure sensor is also installed at the top of the tank wall to provide real-time feedback on the pressure data within the water-film wall. When the pressure falls below a set threshold, the water pump automatically starts to replenish water, and the valve simultaneously opens to connect the water path. After replenishment is complete, the valve automatically closes. The pressure sensor and pump structure within the medium replenishment structure are connected to the control components of the wastewater treatment system to achieve fully automatic control.

[0049] In this embodiment, the pressure medium is water, and the water pump in the medium replenishment structure is connected to the clear water tank of the pool, so as to continuously replenish the pressure of the water film wall using the clean water source in the clear water tank.

[0050] In a preferred embodiment of this invention, the pool body further includes a sludge discharge device. The input end of the sludge discharge device is connected to the bottom of the sludge bin, and its output end is connected to the outside for discharging the sludge from the sludge bin.

[0051] Specifically, such as Figure 7 and Figure 8 As shown, the sewage discharge component is a spiral lifting structure in the prior art. The sewage discharge component includes a sewage discharge pipe, a spiral lifting shaft, and a lifting motor. One end of the sewage discharge pipe extends into the bottom of the sludge bin, and the end at the bottom of the sludge bin has a grid hole. The grid hole is evenly distributed around the circumference of the sewage discharge pipe. The spiral lifting shaft is located inside the sewage discharge pipe, and spiral blades are provided on its outer side. The lifting motor is located at the top of the sewage discharge pipe and is fixed to the sewage discharge pipe by a motor bracket. A sewage outlet is provided near the top of the sewage discharge pipe. The sewage outlet has an inclined tube structure. The sewage discharge pipe passes through the top of the pool and is connected to the top of the pool by a clamp. When installing the sewage discharge component, the sewage discharge pipe can be fixed by the bracket structure to prevent it from putting pressure on the top of the pool. For underground pools, the top of the sewage pipe can extend above the ground and be fixed by a concrete cap at the top of the pit. When fixing with the concrete cap, the edge of the concrete cap must overlap the outer perimeter of the pit to ensure the stability of the overall structure of the pit and to prevent the upper cap from applying additional load to the pool.

[0052] Example 2: Figures 9 to 12 As shown, as another embodiment of the present invention, this embodiment differs from Embodiment 1 in that the pool body further includes a first frame and a second frame. The first frame is fixedly connected to the pool wall and surrounds it to strengthen the circumferential strength of the pool wall; the second frame connects the pool wall and the isolation wall to increase the connection strength between the pool wall and the isolation wall.

[0053] Specifically, in this embodiment, a first connecting sleeve is provided on the outer side of the pool wall. The first connecting sleeve is formed by welding and fixing a long strip structure of the same material as the pool wall to the outer side of the pool wall. The end of the long strip structure is welded to the pool wall. The first connecting sleeves are arranged at intervals along the height direction of the pool wall and distributed along the axial direction to form multiple independent installation structures. The first frame is located inside the first connecting sleeve, so that the first frame is connected to the pool wall. The second connecting sleeve is located inside the annular wall. The second connecting sleeve has the same structure as the first connecting sleeve and is fixed by welding and fixing with a long strip component of the same material. The second frame is embedded inside the second connecting sleeve, forming a stable support with the annular wall.

[0054] The first frame and the second frame are formed by connecting rigid rods end to end. Adjacent rigid rods are connected by connectors. The rigid rods are arc-shaped plastic rods that form a ring structure. One end of the rigid rod is provided with an I-shaped buckle and the other end is provided with an I-shaped slot. The axes of the I-shaped buckle and the I-shaped slot are parallel to the axis of the ring structure formed by the rigid rods. During connection, the I-shaped buckle is inserted into the I-shaped slot to realize the splicing of the ring frame.

[0055] Preferably, the pool body further includes a third skeleton, which is a threaded rod that passes through the first skeleton located on the outer wall and connects the first skeleton located at different heights, thereby achieving longitudinal stability of each layer of skeleton on the outer wall and significantly enhancing the overall rigidity of the outer wall.

[0056] The second skeleton located on the annular wall can also be connected by the third skeleton, so that the second skeletons of each layer form a crisscross support network on the annular wall, further improving the overall deformation resistance of the annular wall and effectively dispersing uneven earth pressure and water flow impact load.

[0057] In this embodiment, the first frame, the second frame, and the third frame constitute a support structure to improve the strength of the pool wall.

[0058] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular forms “a,” “the,” and “the” used in this invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0059] It should be understood that although the terms first, second, third, etc., may be used in this invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this invention, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0060] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage sewage treatment device for remote suburbs, comprising a pool body, wherein the pool body is provided with multiple compartments connected by pipes, characterized in that, The pool body includes: The pool bottom and the pool top are both made of flexible, waterproof material, and the pool top is provided with a through-hole structure for connecting pipes; The pool wall is composed of an air film wall. The pool bottom and the pool top are fixedly and sealed to the pool wall. The pool wall is located between the pool top and the pool bottom. The pool wall, the pool top, and the pool bottom constitute a hollow, closed cavity structure. The partition wall divides the interior of the cavity into multiple independent compartments. The partition wall is an air-supported membrane wall structure. The compartments are arranged sequentially along the sewage flow direction, and adjacent compartments are hydraulically connected through through holes in the partition wall. The air film wall has a hollow internal structure and is filled with a pressure medium.

2. The multi-stage sewage treatment device for suburban areas according to claim 1, characterized in that, The pool wall is annular, with an annular wall on its inner side. The annular gap between the annular wall and the pool wall is divided into multiple fan-shaped compartments by a straight plate wall. Adjacent compartments are connected by through holes provided on the straight plate wall. The annular wall and the straight plate wall constitute the isolation wall.

3. The multi-stage sewage treatment device for remote suburbs according to claim 2, characterized in that, Each sector-shaped chamber is divided into an anaerobic chamber, an aerobic chamber, and a sedimentation chamber according to its function. The chamber enclosed by the annular wall is a sludge chamber. The anaerobic chamber, aerobic chamber, and sedimentation chamber are all connected to the sludge chamber through a pipeline structure.

4. The multi-stage sewage treatment device for suburban areas according to claim 3, characterized in that, The pool body includes: A sludge discharge device, the input end of which is connected to the bottom of the sludge bin, and the output end of which is connected to the outside, for discharging sludge from the sludge bin.

5. The multi-stage sewage treatment device for suburban areas according to claim 3, characterized in that, The anaerobic chamber, aerobic chamber, and sedimentation chamber are all connected to the sedimentation chamber via siphons. The siphon is a U-shaped pipe, and the height of the top of its vertical section decreases sequentially according to the order of the anaerobic chamber, the aerobic chamber, and the sedimentation chamber. The water inlet end of the siphon is located at the bottom of the corresponding chamber to adsorb sludge. The top of the siphon is provided with a siphon break, which is a through hole opened on the wall of the siphon.

6. The multi-stage sewage treatment device for suburban areas according to claim 4, characterized in that, The pipes connecting adjacent compartments are equipped with control valves to control the connection or closure between the compartments.

7. The multi-stage sewage treatment device for suburban areas according to claim 4, characterized in that, The bottom of the sludge bin protrudes beyond the bottom of the pool, so that after installation, the bottom depth of the sludge bin is greater than the bottom depth of the other bins.

8. The multi-stage sewage treatment device for suburban areas according to any one of claims 1-7, characterized in that, The pool body also includes: A first frame is fixedly connected to the pool wall and surrounds it to strengthen the circumferential strength of the pool wall. The second frame connects the pool wall and the isolation wall, and is used to increase the connection strength between the pool wall and the isolation wall.

9. The multi-stage sewage treatment device for suburban areas according to claim 8, characterized in that, The first frame and the second frame are formed by connecting rigid rods end to end, and adjacent rigid rods are connected by connectors.

10. The multi-stage sewage treatment device for remote suburbs according to any one of claims 1-7, characterized in that, The pressure medium is water.

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