Energy-saving built-in aeration type assembled sewage equipment

Abstract

The utility model discloses an energy -conserving assembled sewage equipment of built -in aeration relates to sewage treatment technical field. The equipment includes assembled box, and its inside is divided into the internal carbon source transformation area, anaerobic area, aerobic area, anoxic area and sludge -water separation area that have communicated in proper order through unit partition, is equipped with built -in submerged aeration fan that is immersed in sewage in the internal carbon source transformation area, and this fan is connected with the aeration branch pipe of the bottom of aerobic area and the gas agitator pipeline of the bottom of anoxic area through air inlet pipe and air outlet pipe respectively with external air and aerobic area, anoxic area, and is immersed in sewage with aeration fan built -in, need not independent construction fan room, saves the cost of land occupation and civil engineering, and the heat of fan operation is absorbed by sewage, and the low -temperature denitrification efficiency is promoted, realizes waste heat recovery, and water body absorbs operation noise, adopts assembled box structure, and construction is convenient. The utility model discloses compact structure, energy -conserving environmental protection, and the effect of noise reduction is remarkable, has good popularization and application prospect.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, specifically to an energy-saving prefabricated wastewater treatment device with built-in aeration. Background Technology

[0002] Currently, most mainstream wastewater treatment equipment employs biological treatment processes, and its aeration system typically consists of an external blower and a separate blower room. However, this traditional design has several drawbacks: First, the separate blower room not only increases the plant's footprint and construction costs, but also causes significant energy waste due to the direct dissipation of heat generated by the external blower into the air, which contradicts the industry's energy-saving and environmentally friendly principles. Second, traditional Roots blowers generate noise levels as high as 80-120 dB during operation, causing severe noise pollution to the surrounding environment.

[0003] Furthermore, existing technologies exhibit a significant decrease in biochemical reaction rates at low temperatures, resulting in poor removal of ammonia nitrogen and total nitrogen. The traditional approach involves adding heating facilities, which undoubtedly increases additional energy consumption. Meanwhile, traditional carbon steel welding equipment has poor corrosion resistance, a service life of only 7-8 years, and its size is limited by road transport constraints. For large-scale processing needs, parallel operation of equipment is the only option, leading to complex process pipelines, large footprints, and difficult maintenance.

[0004] Therefore, there is an urgent need to provide a new type of sewage treatment equipment that is compact, energy-saving and environmentally friendly, low-noise, long-life, and not limited by transportation conditions. Utility Model Content

[0005] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide an energy-saving prefabricated sewage treatment equipment with built-in aeration. It aims to solve the problems of large footprint, high energy consumption, serious noise pollution, low efficiency at low temperatures, short equipment life and transportation restrictions of traditional sewage treatment equipment, so as to meet the development needs of energy conservation, environmental protection and intelligent manufacturing.

[0006] The objective of this utility model is achieved through the following technical solution: An energy-saving prefabricated wastewater treatment system with built-in aeration includes a prefabricated tank. The interior of the prefabricated tank is divided into two main parts: a left side section and a right side section. The left side section is further divided into two independent sub-sections: a forward sub-section is an anaerobic zone, and a backward sub-section is an internal carbon source conversion zone. The right side section is arranged horizontally parallel to the length of the tank and is divided into three independent functional zones: an aerobic zone, an anoxic zone, and a sludge-water separation zone. The prefabricated housing is equipped with an aeration device, which includes a built-in submerged aeration fan located in the inner carbon source conversion zone. The built-in submerged aeration fan is fixedly connected to the bottom of the carbon source conversion zone via bolts in the connecting seat. The aeration device also includes an air inlet pipe and an air outlet pipe. One end of the air inlet pipe is connected to the air inlet of the built-in submerged aeration fan, and the other end extends out of the top of the prefabricated housing. One end of the air outlet pipe is connected to the air outlet of the built-in submerged aeration fan, and the other end extends out of the top of the prefabricated housing and is connected to one end of a first air supply branch pipe located in the aerobic zone and a second air supply branch pipe located in the anoxic zone, for supplying air into the aerobic and anoxic zones. The other end of the first air supply branch pipe is connected to a first aeration pipe at the bottom of the aerobic zone, and the other end of the second air supply branch pipe is connected to an air stirring device at the bottom of the anoxic zone.

[0007] Furthermore, water passage holes are provided on the unit partitions between the internal carbon source conversion zone, anaerobic zone, aerobic zone, and anoxic zone (14). The water passage holes are staggered along the height direction to guide the sewage to form an orderly flow path of up and down flow between the functional zones, so that the sewage flows through the internal carbon source conversion zone, anaerobic zone, aerobic zone, and anoxic zone in sequence to complete continuous biochemical treatment. The prefabricated box is equipped with multiple tie rods inside. The tie rods are steel structural members, which are staggered in the horizontal and vertical directions to enhance the structural strength of the box.

[0008] Furthermore, both the first aeration pipe and the air mixing device are horizontally fixed using the tie rod as a support, and vertically fixed to the bottom of the assembled box body by an ABS pipe support.

[0009] Furthermore, the first aeration pipe is horizontally arranged at the bottom of the aerobic zone and consists of multiple vertically intersecting aeration branch pipes; The gas mixing device includes a second aeration pipe, which is horizontally arranged at the bottom of the anoxic zone and consists of multiple vertically intersecting aeration branch pipes. Aerators are evenly arranged on the second aeration pipe.

[0010] Furthermore, biological carriers are provided in the aerobic and hypoxic zones, with the biological carriers located in the middle of the aerobic and hypoxic zones and detachably mounted on the pull rod.

[0011] Furthermore, the prefabricated box is provided with a sewage inlet and a sewage outlet. The sewage inlet is located on the left side of the prefabricated box and is connected to the internal carbon source conversion zone. The sewage outlet is located on the upper side of the unit partition between the anoxic zone and the mud-water separation zone, connecting the anoxic zone and the mud-water separation zone.

[0012] Furthermore, a mud-water separation device is provided in the mud-water separation zone. The mud-water separation device includes a mud-water separation central cylinder, which is connected to the sewage outlet and is vertically fixed in the middle of the mud-water separation zone by angle steel. A collection pipe is provided on the upper side of the mud-water separation central cylinder for the collection and discharge of clean water.

[0013] Furthermore, a sludge discharge pipe is fixedly installed at the bottom of the sludge-water separation zone by an ABS pipe bracket. The sludge discharge pipe is connected to an air lift pipe. The air lift pipe extends upward from the prefabricated box and into the anaerobic zone, and is used to return the sludge at the bottom of the sludge-water separation zone to the anaerobic zone. The part of the air lift pipe that extends out of the prefabricated box is connected to the air outlet pipe through a third air supply branch pipe, and is used to inject compressed air into the air lift pipe. The first gas supply branch pipe, the second gas supply branch pipe, and the third gas supply branch pipe are all equipped with regulating valves.

[0014] Furthermore, the assembled enclosure is assembled from SS304 stainless steel plates or BDF composite plates.

[0015] Furthermore, the prefabricated enclosure also includes an equipment room located on the right side of the mud-water separation zone. The equipment room is equipped with an electrical control cabinet, and the built-in submerged aeration blower and the mud-water separation center cylinder are both connected to the electrical control cabinet.

[0016] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects: (1) Saves land and construction costs: The aeration blower is built into the internal carbon source conversion zone, eliminating the need for a separate blower room, which significantly reduces the equipment footprint and saves on civil engineering investment.

[0017] (2) Energy saving and high efficiency: The blower is submerged in sewage. The heat generated during operation is efficiently absorbed by the water body to raise the sewage temperature. Especially in low temperature environment, it helps to enhance denitrification efficiency, realize waste heat recovery and utilization, and reduce operating energy consumption.

[0018] (3) Noise reduction and environmental protection: By utilizing the high density and sound absorption characteristics of water, it effectively absorbs and blocks mechanical vibration and operating noise, resulting in significant noise reduction and making it suitable for noise-sensitive areas.

[0019] (4) Long service life: The equipment is made of corrosion-resistant materials such as SS304 stainless steel or BDF composite material and assembled by prefabricated structure, which can extend the service life of the equipment to more than 30 years.

[0020] (5) Convenient transportation and installation: The prefabricated structure allows the boards and accessories to be transported to the site for assembly, breaking through size transportation limitations, adapting to different processing scales, with high construction efficiency and simple maintenance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the installation and pipeline connection of the built-in submersible aeration blower of the utility model. Figure 2 A schematic diagram of the elevation structure of the prefabricated sewage treatment equipment of this utility model; Figure 3 A schematic diagram of the bottom pipe distribution of the prefabricated sewage treatment equipment of this utility model; Figure 4 A schematic diagram of the water source flow path during operation of the prefabricated sewage treatment equipment of this utility model.

[0022] In the diagram: 1 is the prefabricated box; 2 is the unit partition; 3 is the aeration device; 4 is the tie rod; 5 is the ABS pipe support; 6 is the biological carrier; 7 is the sludge-water separation device; 8 is the air lift pipe; 9 is the connecting seat; 11 is the internal carbon source conversion zone; 12 is the anaerobic zone; 13 is the aerobic zone; 14 is the anoxic zone; 15 is the sludge-water separation zone; 16 is the inlet; 17 is the outlet; 18 is the equipment room; 31 is the built-in submerged aeration blower; 32 is the air inlet pipe; 33 is the air outlet pipe; 34 is the first aeration pipe; 35 is the air mixing device; 36 is the first air supply branch pipe; 37 is the second air supply branch pipe; 38 is the silencer; 39 is the third air supply branch pipe; 71 is the sludge-water separation central cylinder; 72 is the collection pipe; 73 is the sludge discharge pipe; 74 is the angle steel; 351 is the second aeration pipe; 352 is the aerator. Detailed Implementation

[0023] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Example Please refer to Figures 1 to 3 This utility model provides an energy-saving prefabricated sewage treatment equipment with built-in aeration, mainly comprising a prefabricated tank 1. The prefabricated tank 1 is assembled from SS304 stainless steel plates or BDF composite plates, with special sealant used at the joints between the plates to ensure the watertightness and structural stability of the tank, effectively improving the equipment's corrosion resistance and extending its service life to over 30 years. To enhance the tank's resistance to lateral water pressure, multiple tie rods 4 are installed inside the prefabricated tank 1. These tie rods 4 are steel structural members, distributed alternately laterally and longitudinally inside the tank. Their spacing can be adjusted according to the tank size and pressure requirements, effectively enhancing the overall structural strength of the tank and serving as mounting supports for internal process components, optimizing the utilization of internal space. In this embodiment, two tie rods 4 are distributed laterally and six are distributed longitudinally.

[0025] The interior of the prefabricated enclosure 1 is divided into two main parts: a left partition and a right partition. The left partition is further divided into two independent sub-areas: the front sub-area is the anaerobic zone 12, and the rear sub-area is the internal carbon source conversion zone 11. These sub-areas are arranged horizontally parallel to the length of the enclosure, sequentially dividing into three independent functional areas: an aerobic zone 13, an anoxic zone 14, and a mud-water separation zone 15. Furthermore, the prefabricated enclosure 1 also includes an equipment room 18 for housing the electrical control cabinet. All electrical facilities described in this embodiment are electrically connected to the electrical control cabinet.

[0026] like Figure 4 As shown (for ease of understanding, the horizontal arrangement of the functional areas does not represent their actual locations), water passage holes are provided on the unit partitions 2 between the internal carbon source conversion zone 11, anaerobic zone 12, aerobic zone 13, and anoxic zone 14. These water passage holes are staggered along the height direction: the connecting hole between the internal carbon source conversion zone 11 and the anaerobic zone 12 is located at the lower part of the partition, the water passage hole between the anaerobic zone 12 and the aerobic zone 13 is located at the upper part of the partition, and the water passage hole between the aerobic zone 13 and the anoxic zone 14 is located at the lower part of the partition. This guides the sewage to form an orderly flow path with up-and-down flow between the functional areas, forcing the sewage to flow sequentially through the internal carbon source conversion zone 11, anaerobic zone 12, aerobic zone 13, anoxic zone 14, and sludge-water separation zone 15. Structurally, this eliminates the problems of turbulent and short-circuiting water flow, effectively prolongs the actual hydraulic retention time of the sewage, and enhances the full contact between the sewage and the microorganisms and treatment components in each functional area. Except for the water passage holes at the two locations of the unit partition, the rest of the structure is an integrally sealed structure.

[0027] An aeration device 3 is installed inside the prefabricated housing 1 to provide the necessary air source for the biochemical reaction. The aeration device 3 includes a built-in submersible aeration blower 31 located within the inner carbon source conversion zone 11, which is completely submerged in the wastewater of the inner carbon source conversion zone 11 during operation. Unlike traditional external designs, this blower uses a fully enclosed waterproof shell, isolating its internal impeller, motor, and other components from the water. The built-in submersible aeration blower 31 is fixedly installed at the bottom of the inner carbon source conversion zone 11 via a connecting seat 9. Specifically, a mounting base is pre-installed at the bottom of the prefabricated housing 1. The bottom of the connecting seat 9 is fixedly connected to the mounting base via expansion bolts or pre-embedded bolts. The top of the connecting seat 9 and the bottom of the built-in submersible aeration blower 31 have matching threaded holes, and the built-in submersible aeration blower 31 is rigidly fixed to the connecting seat 9 with bolts. The height of the connecting seat 9 is determined based on the design liquid level of the inner carbon source conversion zone 11 and the optimal submersion depth of the blower, ensuring that the blower is completely submerged in the wastewater during operation. To further reduce the transmission of fan vibration to the housing structure, rubber damping pads or spring dampers can be installed between the fan and the connecting seat 9 to reduce the transmission of vibration to the housing structure. The built-in submersible aeration fan 31 is selected appropriately according to the size of the project system; this utility model uses a fan with a capacity of 2m³ / h.3 A blower with a speed of 0.03 MPa and a wind pressure of 0.03 MPa. Its main function is to force air into the water, generating microbubbles (0.5-2 mm), increasing the dissolved oxygen in the water, and maintaining the life and metabolism of microorganisms in the system. At the same time, the rising bubbles create turbulence, stirring up the bottom sediment, preventing sludge from settling and compacting, and promoting mud-water mixing.

[0028] The aeration device 3 also includes an air inlet pipe 32 and an air outlet pipe 33. One end of the air inlet pipe 32 is connected to the air inlet of the built-in submersible aeration blower 31 by a flange seal, and the other end extends vertically upward, passing through the top of the box and extending to the outside of the assembled box 1, for introducing fresh air to the blower; a silencer 38 can also be installed on the pipe section of the air inlet pipe 32 located outside the box to eliminate the noise of the airflow. The silencer 38 can be a general model that meets the requirements. One end of the air outlet pipe 33 is connected to the air outlet of the built-in submersible aerator 31 via a flange seal, and the other end extends out of the top of the assembled housing 1 and is connected to one end of the first air supply branch pipe 36 located in the aerobic zone 13 and the second air supply branch pipe 37 located in the anoxic zone 14, for supplying air into the aerobic zone 13 and the anoxic zone 14; the other end of the first air supply branch pipe 36 is connected to the first aeration pipe 34 at the bottom of the aerobic zone 13, and the other end of the second air supply branch pipe 37 is connected to the air stirring device 35 at the bottom of the anoxic zone 14. Adjusting valves are provided on the first air supply branch pipe 36 and the second air supply branch pipe 37 to adjust the flow rate of the supplied air to meet the air environment requirements of different functional zones.

[0029] like Figure 3 As shown, as shown Figure 3 This is a schematic diagram of the bottom piping distribution of the prefabricated wastewater treatment equipment. The first aeration pipe 34 is horizontally arranged at the bottom of the aerobic zone 13 and consists of multiple vertically intersecting aeration branch pipes, used to provide dissolved oxygen to the aerobic zone. The air mixing device 35 includes a second aeration pipe 351, which is horizontally arranged at the bottom of the anoxic zone 14 and consists of multiple vertically intersecting aeration branch pipes. Aerators 352 are installed on the second aeration pipe 351, and the aerators 352 are evenly distributed in an array to perform air mixing in the anoxic zone, promoting sludge-water mixing, but not providing a large amount of dissolved oxygen. The size of the first aeration pipe 34 and the air mixing device 35 is determined according to the bottom size of the functional zone they are located in, ensuring sufficient reaction in the functional zone. Both the first aeration pipe 34 and the air mixing device 35 are horizontally fixed using the tie rod 4 as a support and vertically fixed to the bottom of the prefabricated box 1 by the ABS pipe support 5. All gas pipelines within the equipment are made of UPVC material, with diameters ranging from DN32 to 100, and are sealed together using threaded joints.

[0030] Furthermore, a biological carrier 6 is provided in the aerobic zone 13 and the anoxic zone 14. The biological carrier 6 is located in the middle of the aerobic zone 13 and the anoxic zone 14 and is detachably installed on the pull rod 4. The biological carrier 6 is made of hydrophilic fiber material and mainly provides a habitat for microorganisms in the system, thereby increasing the microbial population in the system. In this embodiment, the upper end of the biological carrier 6 is installed on the pull rod 4 by hooks, buckles, or straps, enabling quick installation and replacement.

[0031] The prefabricated housing 1 is equipped with a sewage inlet 16 and a sewage outlet 17. The sewage inlet 16 is located on the left side of the prefabricated housing 1 and is connected to the internal carbon source conversion zone 11, used to introduce sewage to be treated. The sewage outlet 17 is located on the upper side of the unit partition 2 between the anoxic zone 14 and the sludge-water separation zone 15, connecting the anoxic zone 14 and the sludge-water separation zone 15.

[0032] A mud-water separation device 7 is also installed in the mud-water separation zone 15. The mud-water separation device 7 includes a mud-water separation central cylinder 71, which is connected to the sewage outlet 17 and is vertically fixed in the middle of the mud-water separation zone 15 by angle steel 74. There are four angle steels 74, which are evenly distributed along the circumference of the mud-water separation central cylinder 71. One end of each angle steel is fixed to the box and unit partition 2 on the inner side of the mud-water separation zone 15 by welding, and the other end is fixedly connected to the cylinder of the mud-water separation central cylinder 71 by welding, so that the central cylinder is vertically suspended and fixed in the middle of the pool. A collection pipe 72 is provided on the upper side of the mud-water separation central cylinder 71 for the collection and discharge of clean water. The effluent from the aerobic zone 13 and the anoxic zone 14 enters the mud-water separation central cylinder 71 through the sewage outlet 17, and then flows out from the lower flared end of the central cylinder for mud-water separation. The supernatant is discharged through the collection pipe 72 after meeting the standards. The central cylinder has a diameter of DN200~500 and is made of stainless steel.

[0033] A sludge discharge pipe 73 is fixedly installed at the bottom of the sludge-water separation zone 15 via an ABS pipe support 5. The sludge discharge pipe 73 is connected to an air-lift pipe 8, which extends upwards from the prefabricated housing 1 and into the anaerobic zone 12, used to return the sludge from the bottom of the sludge-water separation zone 15 to the anaerobic zone 12. The portion of the air-lift pipe 8 extending out of the prefabricated housing 1 is connected to an air outlet pipe 33 via a third air supply branch pipe 39. Compressed air is injected into the air-lift pipe 8 through the air outlet pipe 33. The air mixes with the sludge in the pipe to form a gas-liquid mixture, reducing its density and creating a density difference between the inside and outside of the pipe. This lifts the sludge to the upper outlet of the pipe, allowing it to be returned via air-lift. This maintains the concentration of activated sludge in the system and replenishes polyphosphate-accumulating bacteria in the anaerobic zone, promoting biological phosphorus removal. A regulating valve is installed on the third air supply branch pipe 39 to adjust the amount of compressed air.

[0034] The working process and principle of this utility model are as follows: The raw wastewater first enters the backward internal carbon source conversion zone 11 through the inlet 16. In this zone, the colloids and organic particles in the raw water are converted into small molecule internal carbon sources that can be utilized by subsequent processes through the hydrolysis of microorganisms. After the carbon source conversion is completed, the wastewater flows upward into the forward anaerobic zone 12 through the lower connecting hole between the internal carbon source conversion zone and the anaerobic zone.

[0035] Within the anaerobic zone 12, polyphosphate-accumulating bacteria complete the phosphorus release reaction and store the internal carbon source generated in the internal carbon source conversion zone within their bodies, providing conditions for subsequent nitrogen and phosphorus removal reactions. After completing phosphorus release and carbon source storage, the wastewater flows downward into the aerobic zone 13 through the upper water passage between the anaerobic and aerobic zones.

[0036] In the aerobic zone 13, the compressed air generated by the built-in submersible aeration blower 31 is transported to the first aeration pipe 34 through the air outlet pipe 33 and the first air supply branch pipe 36, and released into the sewage in the form of tiny bubbles, providing sufficient dissolved oxygen for the aerobic zone. Here, the nitrification reaction of ammonia nitrogen and the aerobic degradation of organic matter are completed, and polyphosphate-accumulating bacteria complete the super-phosphorus absorption. After the aerobic treatment is completed, the sewage flows upward into the anoxic zone 14 through the lower water passage between the aerobic zone and the anoxic zone.

[0037] In the anoxic zone 14, compressed air generated by the built-in submersible aeration blower 31 is transported to the air mixing device 35 through the air outlet pipe 33 and the second air supply branch pipe 37. Microbubbles are generated by the aerator on the second aeration pipe 351 to agitate the anoxic zone and maintain the sludge in suspension. The system maintains a low dissolved oxygen environment here. Denitrifying bacteria use the internal carbon source stored in the anaerobic zone to complete the denitrification of total nitrogen. After denitrification is completed, the wastewater flows into the sludge-water separation zone 15 through the sewage outlet 17.

[0038] Within the sludge-water separation zone 15, wastewater first enters the sludge-water separation central cylinder 71, and then enters the separation zone for settling under the guidance of the central cylinder, completing the solid-liquid separation of sludge and water. The separated clean water is collected through the collection pipe 72 at the top of the central cylinder and discharged after meeting the standards. The sludge at the bottom is returned to the anaerobic zone through the sludge discharge pipe 73 and the air lift pipe 8, realizing the internal circulation of sludge.

[0039] During equipment operation, the built-in submersible aeration blower 31 operates submerged in sewage. The mechanical vibration and aerodynamic noise it generates are first blocked by the sealed waterproof shell. Subsequently, when it propagates into the water, most of the noise energy is absorbed by the water, effectively reducing the operating noise of the equipment and meeting the needs of noise-sensitive areas. At the same time, the heat generated by the blower, including motor heat loss and mechanical friction heat, is efficiently transferred to the surrounding sewage through the waterproof shell. This waste heat circulates between the functional areas with the water flow, effectively increasing the temperature of the entire biological system. Especially in low-temperature environments in winter, it can effectively protect the activity of nitrifying and denitrifying bacteria, avoid excessive ammonia nitrogen and total nitrogen, and eliminate the need for additional heating facilities, realizing the recovery and utilization of waste heat and effectively reducing the operating energy consumption of the equipment.

[0040] In summary, this invention, by embedding the aerator blower within the wastewater and employing a corrosion-resistant, prefabricated housing structure, not only solves the problems of large footprint, high noise, and energy waste associated with traditional processes, but also improves treatment efficiency through waste heat recovery. Furthermore, the modular and prefabricated design concept endows the equipment with outstanding advantages such as long lifespan, easy transportation, and quick installation. Therefore, this invention demonstrates significant technological advancements and practical value in the fields of energy conservation, environmental protection, and intelligent manufacturing, making it suitable for large-scale application.

Claims

1. An energy-saving prefabricated sewage treatment plant with built-in aeration, comprising a prefabricated housing (1), characterized in that, The prefabricated box (1) is divided into two main parts: a left partition and a right partition. The left partition is divided into two independent sub-areas: the front sub-area is the anaerobic zone (12), and the rear sub-area is the internal carbon source conversion zone (11). The right partition is arranged horizontally along the length of the box and is divided into three independent functional areas: an aerobic zone (13), an anoxic zone (14), and a mud-water separation zone (15). An aeration device (3) is installed inside the assembled box (1). The aeration device (3) includes a built-in submerged aeration fan (31) located in the inner carbon source conversion zone (11). The built-in submerged aeration fan (31) is fixedly connected to the bottom of the inner carbon source conversion zone (11) by bolts through the connecting seat (9). The aeration device (3) also includes an air inlet pipe (32) and an air outlet pipe (33). One end of the air inlet pipe (32) is connected to the air inlet of the built-in submerged aeration fan (31), and the other end extends out of the top of the assembled box (1). The air outlet pipe (33) One end is connected to the air outlet of the built-in submersible aeration blower (31), and the other end extends out of the top of the assembled box (1) and is connected to one end of the first air supply branch pipe (36) located in the aerobic zone (13) and the second air supply branch pipe (37) located in the anoxic zone (14), for sending air into the aerobic zone (13) and the anoxic zone (14); the other end of the first air supply branch pipe (36) is connected to the first aeration pipe (34) at the bottom of the aerobic zone (13), and the other end of the second air supply branch pipe (37) is connected to the air stirring device (35) at the bottom of the anoxic zone (14).

2. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 1, characterized in that, Water passage holes are provided on the unit partition (2) between the internal carbon source conversion zone (11), anaerobic zone (12), aerobic zone (13), and anoxic zone (14). The water passage holes are staggered along the height direction to guide the sewage to form an orderly flow path of up and down flow between the functional zones, so that the sewage flows through the internal carbon source conversion zone (11), anaerobic zone (12), aerobic zone (13), and anoxic zone (14) in sequence to complete continuous biochemical treatment. The prefabricated box (1) is equipped with multiple tie rods (4). The tie rods (4) are steel structural members, which are staggered in the horizontal and vertical directions to enhance the structural strength of the box.

3. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 2, characterized in that, The first aeration pipe (34) and the air stirring device (35) are both horizontally fixed using the tie rod (4) as a support, and vertically fixed to the bottom of the assembled box (1) by the ABS pipe support (5).

4. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 1, characterized in that, The first aeration pipe (34) is horizontally arranged at the bottom of the aerobic zone (13) and is composed of multiple vertically intersecting aeration branch pipes; The gas stirring device (35) includes a second aeration pipe (351), which is horizontally arranged at the bottom of the anoxic zone (14) and is composed of multiple vertically intersecting aeration branch pipes. Aerators (352) are evenly arranged on the second aeration pipe (351).

5. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 3, characterized in that, Biological carriers (6) are provided in the aerobic zone (13) and the hypoxic zone (14). The biological carriers (6) are located in the middle of the aerobic zone (13) and the hypoxic zone (14) and are detachably installed on the pull rod (4).

6. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 1, characterized in that, The prefabricated box (1) is provided with a sewage inlet (16) and a sewage outlet (17). The sewage inlet (16) is located on the left side of the prefabricated box (1) and is connected to the internal carbon source conversion zone (11). The sewage outlet (17) is located on the upper side of the unit partition (2) between the anoxic zone (14) and the mud-water separation zone (15), connecting the anoxic zone (14) and the mud-water separation zone (15).

7. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 6, characterized in that, The mud-water separation zone (15) is equipped with a mud-water separation device (7), which includes a mud-water separation central cylinder (71). The mud-water separation central cylinder (71) is connected to the sewage outlet (17) and is vertically fixed in the middle of the mud-water separation zone (15) by angle steel (74). A collection pipe (72) is provided on the upper side of the mud-water separation central cylinder (71) for collecting and discharging clean water.

8. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 7, characterized in that, The bottom of the mud-water separation zone (15) is fixedly provided with a sludge discharge pipe (73) by an ABS pipe bracket (5). The sludge discharge pipe (73) is connected to an air lift pipe (8). The air lift pipe (8) extends upward from the assembled box (1) and into the anaerobic zone (12) to return the sludge at the bottom of the mud-water separation zone (15) to the anaerobic zone (12). The part of the air lift pipe (8) extending out of the assembled box (1) is connected to the air outlet pipe (33) through a third air supply branch pipe (39) to inject compressed air into the air lift pipe (8). Adjusting valves are provided on the first gas supply branch pipe (36), the second gas supply branch pipe (37) and the third gas supply branch pipe (39).

9. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 1, characterized in that, The assembled box (1) is assembled from SS304 stainless steel plate or BDF composite plate.

10. The energy-saving prefabricated sewage treatment equipment with built-in aeration according to claim 7, characterized in that, The prefabricated box (1) also includes an equipment room (18), which is located on the right side of the mud-water separation zone (15). The equipment room (18) is equipped with an electrical control cabinet, and the built-in submerged aeration blower (31) and the mud-water separation center cylinder (71) are both connected to the electrical control cabinet.

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