Urban sewage treatment device

Abstract

The invention discloses an urban sewage treatment device, and relates to the field of sewage treatment. The pretreatment unit is used for separating large-particle impurities in the sewage; the composite biological reaction unit is used for carrying out organic degradation and nitrogen-phosphorus conversion on the sewage passing through the pretreatment unit; the nano adsorption unit is used for further removing micro pollutants and heavy metal ions; a detachable plate is arranged at the position, close to the nano adsorption unit, of the treatment box, a first liquid pumping machine is arranged at the top of the treatment box, a first water pipe facing the composite biological reaction unit is arranged on the outer surface of the first liquid pumping machine, and a spraying device facing the nano adsorption unit and provided with a high-pressure spray head is further arranged on the outer surface of the first liquid pumping machine; sewage firstly passes through the pretreatment unit to remove large-particle impurities, then enters the composite biological unit to be organically degraded, and finally enters the nano adsorption unit through the liquid pumping machine to further remove micro pollutants and heavy metal ions, so that multiple treatment is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and specifically to an urban sewage treatment device. Background Art

[0002] With the acceleration of the urbanization process, the urban population has increased sharply, industrial activities have become increasingly frequent, and the generation of urban sewage has shown an explosive growth. At the same time, people's requirements for the water environment quality have also been continuously improved, which makes urban sewage treatment a key link to ensure the sustainable development of the urban ecological environment. However, the existing urban sewage treatment technologies have shown obvious limitations in many aspects.

[0003] Traditional biological treatment technologies mostly rely on single or a few kinds of microbial flora. When facing urban sewage with complex components and diverse pollutants, their treatment capabilities are stretched. For example, relying solely on several common bacteria to treat sewage, it is almost impossible to degrade some new pollutants, such as drug residues and endocrine disruptors. Moreover, traditional biological treatment systems are extremely sensitive to fluctuations in water quality and quantity. When the organic matter concentration in the sewage suddenly increases or decreases, the growth and metabolism of microorganisms are severely affected, resulting in a significant decline in treatment efficiency and making it difficult to meet the discharge standards stably. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the technical solution adopted by the present invention to solve its technical problems is: An urban sewage treatment device described in the present invention includes a treatment tank, and further includes:

[0005] A pretreatment unit for separating large particle impurities in the sewage, a composite biological reaction unit for organically degrading and nitrogen and phosphorus converting the sewage after passing through the pretreatment unit, and a nano-adsorption unit for further removing micro-pollutants and heavy metal ions;

[0006] A disassembly plate is provided at the position of the treatment tank close to the nano-adsorption unit. A first liquid extractor is provided at the top of the treatment tank. A first water pipe facing the composite biological reaction unit is provided on the outer surface of the first liquid extractor. A spraying device with a high-pressure nozzle facing the nano-adsorption unit is also provided on the outer surface of the first liquid extractor;

[0007] The composite biological reaction unit includes a first reservoir. Partition plates one and two are sequentially provided on the inner wall of the first reservoir. A second circulation unit is provided on partition plate one. A first circulation unit is provided on partition plate two. Ventilation holes are provided on partition plates one and two. Partition plates one and two divide the first reservoir into three biological chambers, which are respectively filled with bacteria for efficiently degrading organic matter, algae, and fungi with special functions. A water holding table is provided at the top of partition plate two. Transparent glass plates for sunlight penetration are provided on both sides of partition plate one.

[0008] Preferably, the first reservoir is arranged on one side of the processing tank close to the pretreatment unit. Bacteria are placed in the biological bin on one side of the first reservoir close to the water storage table, algae are placed in the middle biological bin of the first reservoir, and fungi are placed in the biological bin on the other side.

[0009] Preferably, the first circulation unit includes a second water pump. An outlet pipe one is arranged on the outer surface of the second water pump. An inlet channel is arranged on the side of the second water pump away from the outlet pipe one. A first inlet pipe is arranged at the bottom of the inlet channel. An electrostatic adsorption device is arranged at the bottom of the inlet channel. A first electrode plate is arranged on the outer surface of the electrostatic adsorption device. A second electrode plate connected to the electrostatic adsorption device through an electric wire is arranged on the inner wall of the first water pipe. Adhesive bumps with rough materials are evenly arranged on the outer surface of the second electrode plate. A recovery mechanism is further arranged at the top of the first inlet pipe.

[0010] Preferably, the second water pump is arranged in the middle of the second partition board, and the outlet pipe one is located in the algae biological bin.

[0011] Preferably, the recovery mechanism includes a support column. A bottom block is fixedly connected to the bottom of the support column. An air floating plate is slidably connected to the outer surface of the support column. A first support plate is fixedly connected to the outer surface of the air floating plate. A soft brush is arranged at the bottom of the first support plate.

[0012] Preferably, the top of the support column is fixedly connected to the top of the first inlet pipe, and the soft brush is in contact with the outer surface of the second electrode plate.

[0013] Preferably, the second circulation unit includes a third water pump. A second inlet pipe is arranged on the outer surface of the third water pump. A screen is fixedly connected to the bottom of the second inlet pipe. An outlet pipe three is arranged on the side of the third water pump away from the second inlet pipe.

[0014] Preferably, the pretreatment unit includes a support frame. A first rotating handle is arranged on the support frame. One end of the first rotating handle is fixedly connected to an isolation filter screen. Side plates are symmetrically arranged on both sides of the isolation filter screen. Impact rods are symmetrically arranged on both sides of the side plates. A sliding block is slidably connected to the inner wall of the side plate. A shovel is fixedly connected to the side of the sliding block facing the isolation filter screen;

[0015] The support frames are symmetrically arranged on the top of the processing tank, and the shovel is in contact with the isolation filter screen.

[0016] Preferably, the nano-adsorption unit includes a second reservoir. A second support plate is provided on the inner wall of the second reservoir. A curved surface is provided on the second support plate. A nanofiber membrane is provided on the top of the second support plate. A nano-particle layer with special adsorption properties is loaded on the surface of the nanofiber membrane. A second rotary handle is provided on the side of the second support plate. One end of the second rotary handle is provided with a rotary plate. A stain box is placed at the bottom of the second support plate.

[0017] Preferably, the nano-adsorption unit further includes support rods symmetrically arranged on both sides of the treatment tank. The top of the support rods is fixedly connected to a third support plate. The bottom of the third support plate is symmetrically provided with telescopic rods. The bottom of the telescopic rods is fixedly connected to a blocking plate.

[0018] The beneficial effects of the present invention are as follows:

[0019] 1. By setting the pretreatment unit in the present invention, after the sewage flows through the isolation filter screen through an external pipeline, the isolation filter screen will block large particles and dust. Every once in a while, by adjusting the first rotary handle to drive the isolation filter screen to rotate half a circle, so that the sliding block originally at the bottom rotates to the top. Due to its own gravity, the sliding block will slide down along the side plate and drive the scraper to scrape off the particulate matter adhering to the surface layer of the isolation filter screen, avoiding excessive particulate matter from hindering the movement of water flow and the isolation effect of the isolation filter screen.

[0020] 2. By setting the composite biological reaction unit in the present invention, three biological bins of bacteria, algae and fungi are set to treat sewage. Specific bacteria preferentially decompose macromolecular organic matter to provide a nutrient source for algae. Algae produce oxygen through photosynthesis, which in turn provides a living environment for aerobic bacteria, forming a benign ecological cycle.

[0021] 3. By setting the first circulation unit in the present invention, during the process of sewage and bacteria entering the first water inlet pipe, the electrostatic adsorption device will energize the first electrode plate and the second electrode plate, so that a magnetic field is generated between the electrode plates. The generated magnetic field will adsorb bacteria in the sewage and make the bacteria adhere to the adhesion bumps, and finally be recycled by the recycling mechanism.

[0022] 4. By setting the recycling mechanism in the present invention, under the buoyancy of water, the air floating plate will be at the top of the support column. As the sewage enters the algae biological bin, the water level in the original bacteria biological bin drops, and the air floating plate will slide down along the support column, thereby driving the first support plate and the soft brush to brush the second electrode plate and the adhesion bumps. At the same time, the electrostatic adsorption device stops working, and the adsorbed bacteria will be brushed off into the water at the bottom layer.

[0023] 5. In the present invention, by setting up a nano-adsorption unit, at regular intervals, the telescopic rod drives the baffle plate to move downward, hindering the flow of water. After accumulating a certain amount of water, the telescopic rod resets upward, and the accumulated water flows through the curved surface to the back of the nanofiber membrane, realizing reverse flushing of the nanofiber membrane. At the same time, the rotating plate is opened to flush pollutants such as microparticles, colloids, and bacteria blocked into the stain box. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the present invention.

[0025] Figure 2 is a structural sectional view of the present invention.

[0026] Figure 3 is a schematic structural diagram of the pretreatment unit of the present invention.

[0027] Figure 4 is a schematic partial structural diagram of the pretreatment unit of the present invention.

[0028] Figure 5 is a schematic structural diagram of the composite biological reaction unit of the present invention.

[0029] Figure 6 is a schematic structural diagram of the first circulation unit of the present invention.

[0030] Figure 7 is a structural sectional view of the first circulation unit of the present invention.

[0031] Figure 8 is Figure 7 an enlarged view of part A in

[0032] Figure 9 is a schematic structural diagram of the second circulation unit of the present invention.

[0033] Figure 10 is a schematic structural diagram of the nano-adsorption unit of the present invention.

[0034] In the figure: 1. Treatment tank; 2. Pretreatment unit; 3. First liquid extraction pump; 4. First water pipe; 5. Spraying device; 6. High-pressure nozzle; 7. Demountable plate; 8. Composite biological reaction unit; 9. Nano adsorption unit; 21. Support frame; 22. First rotary handle; 23. Isolation filter screen; 24. Side plate; 25. Impact rod; 26. Sliding block; 27. Scraper; 81. First reservoir; 82. First partition board; 83. Second partition board; 84. Water holding table; 85. Glass plate; 86. Ventilation hole; 87. First circulation unit; 88. Second circulation unit; 871. Second water pump; 872. First water outlet pipe; 873. Water inlet channel; 874. First water inlet pipe; 875. Electrostatic adsorption device; 876. First electrode plate; 877. Second electrode plate; 878. Adhesion bump; 879. Recovery mechanism; 8791. Support column; 8792. Bottom block; 8793. Air floating plate; 8794. First support plate; 8795. Soft brush; 881. Third water pump; 882. Second water inlet pipe; 883. Screen; 884. Third water outlet pipe; 91. Second reservoir; 92. Second support plate; 93. Curved surface; 94. Nanofiber membrane; 95. Nanoparticle layer; 96. Second rotary handle; 97. Rotary plate; 98. Stain box; 99. Support rod; 910. Third support plate; 911. Telescopic rod; 912. Partition board. Detailed implementation mode

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation modes. The embodiments of the present invention are given for purposes of illustration and description, and are not exhaustive or limit the present invention to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present invention, and to enable those of ordinary skill in the art to understand the present invention and thus design various embodiments with various modifications suitable for specific purposes.

[0036] Example 1, use Figures 1 - 10 A municipal sewage treatment device according to an embodiment of the present invention will be described as follows.

[0037] As Figures 1 - 2 shown, a municipal sewage treatment device of the present invention includes a treatment tank 1, and further includes:

[0038] A pretreatment unit 2 for separating large particle impurities in sewage, a composite biological reaction unit 8 for organically degrading and nitrogen and phosphorus converting the sewage after passing through the pretreatment unit 2, and a nano adsorption unit 9 for further removing micro pollutants and heavy metal ions.

[0039] A disassembly plate 7 is provided near the nano adsorption unit 9 of the treatment tank 1. A first liquid extractor 3 is provided at the top of the treatment tank 1. A first water pipe 4 facing the composite biological reaction unit 8 is provided on the outer surface of the first liquid extractor 3. A spraying device 5 with a high-pressure nozzle 6 facing the nano adsorption unit 9 is also provided on the outer surface of the first liquid extractor 3;

[0040] When the present invention is working, the sewage will first remove large particulate impurities through the pretreatment unit 2, and then enter the composite biological unit where it will be organically degraded. Finally, it will enter the nano adsorption unit 9 through the first liquid extractor 3 to further remove minute pollutants and heavy metal ions, thereby achieving multiple treatments.

[0041] Such as Figure 5 As shown, the composite biological reaction unit 8 includes a first reservoir 81. A first partition 82 and a second partition 83 are sequentially provided on the inner wall of the first reservoir 81. A second circulation unit 88 is provided on the first partition 82. A first circulation unit 87 is provided on the second partition 83. Ventilation holes 86 are provided on the first partition 82 and the second partition 83. The first partition 82 and the second partition 83 divide the first reservoir 81 into three biological compartments, which respectively place bacteria for efficiently degrading organic matter, algae, and fungi with special functions. A water holding table 84 is provided at the top of the second partition. Transparent glass plates 85 that can transmit sunlight are provided on both sides of the first partition 82.

[0042] The first reservoir 81 is arranged on the side of the treatment tank 1 close to the pretreatment unit 2. Bacteria are placed in the biological compartment on the side of the first reservoir 81 close to the water holding table 84. Algae are placed in the middle biological compartment of the first reservoir 81. Fungi are placed in the other biological compartment.

[0043] Three biological compartments of bacteria, algae, and fungi are set up to treat sewage. The bacteria rely on the extracellular enzymes secreted by themselves to decompose macromolecular organic matter into small molecular substances. The small molecular organic matter is more easily absorbed and utilized by other microorganisms. This process not only reduces the content of organic matter in the sewage, but also provides a necessary nutrient source for the subsequent growth of algae. The algae utilize the nutrients produced by the bacteria decomposing organic matter and grow and reproduce through photosynthesis. The oxygen produced by photosynthesis is crucial for maintaining the aerobic environment in the system and provides suitable living conditions for aerobic bacteria, ensuring that the aerobic bacteria can continuously and efficiently decompose the remaining organic matter in the sewage. Finally, the fungi can decompose the refractory organic pollutants in the sewage. At the same time, some metabolites will also be produced during the metabolism of the fungi. Some of these products can promote the growth of bacteria and algae, further optimizing the treatment efficiency of the entire microbial ecosystem.

[0044] Such as Figures 6 - 7As shown in the figure, the first circulation unit 87 includes the second water pump 871. The outer surface of the second water pump 871 is provided with the first water outlet pipe 872. On the side of the second water pump 871 away from the first water outlet pipe 872, there is a water inlet channel 873. At the bottom of the water inlet channel 873, there is the first water inlet pipe 874. At the bottom of the water inlet channel 873, there is an electrostatic adsorption device 875. The outer surface of the electrostatic adsorption device 875 is provided with the first electrode plate 876. On the inner wall of the first water pipe 4, there is a second electrode plate 877 connected to the electrostatic adsorption device 875 through an electric wire. The outer surface of the second electrode plate 877 is evenly provided with rough adhesion bumps 878. At the top of the first water inlet pipe 874, there is also a recovery mechanism 879.

[0045] After the sewage is decomposed by bacteria, it will be pumped into the biological tank of algae by the second water pump 871 through the first water inlet pipe 874. If the bacterial biota enters the biological tank of algae, there may be a competitive relationship among some microorganisms, competing for limited resources such as nutrients and living space, resulting in the growth inhibition of some microorganisms. At the same time, some microorganisms may produce substances that inhibit the growth of other microorganisms during the metabolic process. Therefore, during the process of sewage and the bacterial group entering the first water inlet pipe 874, the electrostatic adsorption device 875 will energize the first electrode plate 876 and the second electrode plate 877, so as to generate a magnetic field between the electrode plates. The generated magnetic field will adsorb the bacteria in the sewage and make the bacteria adhere to the adhesion bumps 878, and finally be recovered by the recovery mechanism 879.

[0046] The second water pump 871 is arranged in the middle of the second partition 83, and the first water outlet pipe 872 is in the biological tank of algae.

[0047] As Figure 8 shown in the figure, the recovery mechanism 879 includes a support column 8791. The bottom of the support column 8791 is fixedly connected with a bottom block 8792. The outer surface of the support column 8791 is slidably connected with an air floating plate 8793. The outer surface of the air floating plate 8793 is fixedly connected with a first support plate 8794. At the bottom of the first support plate 8794, there is a soft brush 8795.

[0048] The air floating plate 8793 will be at the top of the support column 8791. As the sewage enters the biological tank of algae, the water level in the original bacterial biological tank drops, and the air floating plate 8793 will slide down along the support column 8791, thereby driving the first support plate 8794 and the soft brush 8795 to brush the second electrode plate 877 and the adhesion bumps 878. At the same time, the electrostatic adsorption device 875 stops working, and the adsorbed bacteria will be brushed off into the water at the bottom layer.

[0049] The top of the support column 8791 is fixedly connected with the top of the first water inlet pipe 874, and the soft brush 8795 is in contact with the outer surface of the second electrode plate 877.

[0050] As Figure 9As shown in the figure, the second circulation unit 88 includes a third water pump 881. The outer surface of the third water pump 881 is provided with a second water inlet pipe 882. The bottom of the second water inlet pipe 882 is fixedly connected with a screen 883. The side of the third water pump 881 away from the second water inlet pipe 882 is provided with a third water outlet pipe 884.

[0051] The screen 883 can prevent algae from entering the fungal bioreactor and avoid the occurrence of survival competition.

[0052] The specific working process is as follows:

[0053] During operation, the sewage will first come into contact with bacteria, reducing the organic matter content in the sewage. Then, the algae absorb nitrogen and phosphorus in the sewage, reducing the risk of water eutrophication and the harm to the environment. Finally, the fungi have the ability to specifically treat certain special pollutants in sewage treatment. When the sewage passes through the first circulation unit 87, the electrostatic adsorption device 875 will energize the first electrode plate 876 and the second electrode plate 877, thereby generating a magnetic field between the electrode plates. The generated magnetic field will adsorb bacteria in the sewage and make the bacteria adhere to the adhesion bumps 878. As the sewage enters the algae bioreactor, the water level in the original bacteria bioreactor drops, and the air floating plate 8793 will slide down along the support column 8791, thereby driving the first support plate 8794 and the soft brush 8795 to brush the second electrode plate 877 and the adhesion bumps 878. At the same time, the electrostatic adsorption device 875 stops working, and the adsorbed bacteria will be brushed off into the water at the bottom layer, realizing the isolation of organisms.

[0054] Embodiment 2, use Figures 1 - 10 A description is given below of a municipal sewage treatment device according to an embodiment of the present invention.

[0055] As Figures 3 - 4 As shown in the figure, a municipal sewage treatment device of the present invention, on the basis of Embodiment 1, the pretreatment unit 2 includes a support frame 21. A first rotating handle 22 is provided on the support frame 21. One end of the first rotating handle 22 is fixedly connected with an isolation filter screen 23. Side plates 24 are symmetrically arranged on both sides of the isolation filter screen 23. Impact rods 25 are symmetrically arranged on both sides of the side plates 24. A sliding block 26 is slidably connected to the inner wall of the side plate 24. A shovel 27 is fixedly connected to the side of the sliding block 26 facing the isolation filter screen 23;

[0056] The support frame 21 is symmetrically arranged on the top of the treatment tank 1, and the shovel 27 is in contact with the isolation filter screen 23.

[0057] After the sewage flows through the isolation filter screen 23 via an external pipeline, the isolation filter screen 23 will block large particles and dust. Every once in a while, the isolation filter screen 23 is driven to rotate half a turn by adjusting the rotary handle 1 22, so that the sliding block originally at the bottom rotates to the top. Due to its own gravity, the sliding block will slide down along the side plate and drive the scraper 27 to scrape off the particulate matter adhering to the surface of the isolation filter screen 23, preventing excessive particulate matter from hindering the movement of water flow and the isolation effect of the isolation filter screen 23.

[0058] As Figure 10 shown, the nano-adsorption unit 9 includes a second reservoir 91. A second support plate 92 is provided on the inner wall of the second reservoir 91. A curved surface 93 is provided on the second support plate 92. A nanofiber membrane 94 is provided on the top of the second support plate 92. A nano-particle layer 95 with special adsorption properties is loaded on the surface of the nanofiber membrane 94. A second rotary handle 96 is provided on the side of the second support plate 92. A rotary plate 97 is provided at one end of the second rotary handle 96. A stain box 98 is placed at the bottom of the second support plate 92.

[0059] The nano-adsorption unit 9 further includes support rods 99 symmetrically arranged on both sides of the treatment tank 1. The top of the support rods 99 is fixedly connected to a third support plate 910. Telescopic rods 911 are symmetrically arranged at the bottom of the third support plate 910. The bottom of the telescopic rods 911 is fixedly connected to a baffle 912.

[0060] After the sewage enters the second reservoir 91 through the first liquid pump 3, it will pass through the nanofiber membrane 94. Its pore size can be precisely controlled at the nano level, and it can effectively intercept pollutants such as fine particles, colloids, and bacteria in the sewage. At the same time, the nano-particles on the membrane surface can specifically adsorb heavy metal ions, organic pollutants, etc. in the sewage, further improving the purification effect. Every once in a while, the telescopic rod 911 will drive the baffle 912 to move downward to block the water flow. After accumulating a certain amount of water, the telescopic rod 911 resets upward, and the accumulated water will flow through the curved surface 93 to the back of the nanofiber membrane 94 to realize the reverse flushing of the nanofiber membrane 94. At the same time, the rotary plate 97 is opened to flush the blocked fine particles, colloids, bacteria and other pollutants into the stain box 98.

[0061] The specific working process is as follows:

[0062] During operation, the sewage will pass through the isolation filter screen 23 before entering the composite biological unit. The isolation filter screen 23 will block large particles and dust. Every once in a while, by adjusting the rotating handle 22, the isolation filter screen 23 is driven to rotate half a turn, so that the sliding block originally at the bottom rotates to the top. Due to its own gravity, the sliding block will slide down along the side plate and drive the scraper 27 to scrape off the particulate matter adhering to the surface layer of the isolation filter screen 23. At the same time, after passing through the composite biological unit, it will pass through the nanofiber membrane 94 and effectively intercept pollutants such as fine particles, colloids, and bacteria in the sewage. Every once in a while, the telescopic rod 911 will drive the baffle 912 to move downward to block the flow of water. After accumulating a certain amount of water, the telescopic rod 911 resets upward, and the accumulated water will flow through the curved surface 93 to the back of the nanofiber membrane 94 to realize the reverse flushing of the nanofiber membrane 94.

[0063] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art and related fields without creative work shall fall within the protection scope of the present invention. The structures, devices, and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. An urban sewage treatment device, comprising a treatment tank (1), characterized in that, It also includes: A pretreatment unit (2) for separating large particulate impurities in sewage, a composite biological reaction unit (8) for organically degrading and nitrogen and phosphorus converting the sewage after passing through the pretreatment unit (2), and a nano-adsorption unit (9) for further removing micro-pollutants and heavy metal ions; A disassembly plate (7) is arranged near the nano-adsorption unit (9) of the treatment tank (1). A first liquid pump (3) is arranged at the top of the treatment tank (1). A first water pipe (4) facing the composite biological reaction unit (8) is arranged on the outer surface of the first liquid pump (3). A spraying device (5) with a high-pressure nozzle (6) facing the nano-adsorption unit (9) is also arranged on the outer surface of the first liquid pump (3); The composite biological reaction unit (8) includes a first reservoir (81). A first partition plate (82) and a second partition plate (83) are sequentially arranged on the inner wall of the first reservoir (81). A second circulation unit (88) is arranged on the first partition plate (82). A first circulation unit (87) is arranged on the second partition plate (83). Ventilation holes (86) are arranged on the first partition plate (82) and the second partition plate (83). The first partition plate (82) and the second partition plate (83) divide the first reservoir (81) into three biological bins, in which bacteria for efficiently degrading organic matter, algae, and fungi with special functions are placed respectively. A water holding table (84) is arranged at the top of the second partition plate. Glass plates (85) that can transmit sunlight are arranged on both sides of the first partition plate (82).

2. The urban sewage treatment device according to claim 1, characterized in that: The first reservoir (81) is arranged on one side of the treatment tank (1) close to the pretreatment unit (2). Bacteria are placed in the biological bin on the side of the first reservoir (81) close to the water holding table (84). Algae are placed in the middle biological bin of the first reservoir (81). Fungi are placed in the other biological bin.

3. An urban sewage treatment device according to claim 1, characterized in that: The first circulation unit (87) includes a second liquid pump (871). A first water outlet pipe (872) is arranged on the outer surface of the second liquid pump (871). An inlet channel (873) is arranged on the side of the second liquid pump (871) away from the first water outlet pipe (872). A first water inlet pipe (874) is arranged at the bottom of the inlet channel (873). An electrostatic adsorption device (875) is arranged at the bottom of the inlet channel (873). A first electrode plate (876) is arranged on the outer surface of the electrostatic adsorption device (875). A second electrode plate (877) connected to the electrostatic adsorption device (875) through an electric wire is arranged on the inner wall of the first water pipe (4). Adhesive bumps (878) with a rough texture are evenly arranged on the outer surface of the second electrode plate (877). A recovery mechanism (879) is also arranged at the top of the first water inlet pipe (874).

4. An urban sewage treatment device according to claim 3, characterized in that: The second liquid pump (871) is arranged in the middle of the second partition plate (83). The first water outlet pipe (872) is located in the algae biological bin.

5. The urban sewage treatment device according to claim 3, characterized in that: The recycling mechanism (879) includes a support column (8791), a bottom block (8792) is fixedly connected to the bottom of the support column (8791), an air floating plate (8793) is slidably connected to the outer surface of the support column (8791), a first support plate (8794) is fixedly connected to the outer surface of the air floating plate (8793), and a soft brush (8795) is arranged at the bottom of the first support plate (8794).

6. The urban sewage treatment device according to claim 5, characterized in that: The top of the support column (8791) is fixedly connected to the top of the first water inlet pipe (874), and the soft brush (8795) is in contact with the outer surface of the second electrode plate (877).

7. The urban sewage treatment device according to claim 1, characterized in that: The second circulation unit (88) includes a third water pump (881), a second water inlet pipe (882) is arranged on the outer surface of the third water pump (881), a screen (883) is fixedly connected to the bottom of the second water inlet pipe (882), and a third water outlet pipe (884) is arranged on one side of the third water pump (881) away from the second water inlet pipe (882).

8. An urban sewage treatment device according to claim 1, characterized in that: The pretreatment unit (2) includes a support frame (21), a first rotary handle (22) is arranged on the support frame (21), a separation filter screen (23) is fixedly connected to one end of the first rotary handle (22), side plates (24) are symmetrically arranged on both sides of the separation filter screen (23), impact rods (25) are symmetrically arranged on both sides of the side plates (24), a sliding block (26) is slidably connected to the inner wall of the side plates (24), and a shovel (27) is fixedly connected to one side of the sliding block (26) facing the separation filter screen (23); The support frame (21) is symmetrically arranged on the top of the processing box (1), and the shovel (27) is in contact with the separation filter screen (23).

9. The urban sewage treatment device according to claim 1, characterized in that: The nano adsorption unit (9) includes a second reservoir (91), a second support plate (92) is arranged on the inner wall of the second reservoir (91), a curved surface (93) is arranged on the second support plate (92), a nanofiber membrane (94) is arranged on the top of the second support plate (92), a nano particle layer (95) with special adsorption performance is loaded on the surface of the nanofiber membrane (94), a second rotary handle (96) is arranged on the side of the second support plate (92), a rotary plate (97) is arranged at one end of the second rotary handle (96), and a stain box (98) is placed at the bottom of the second support plate (92).

10. A municipal sewage treatment device according to claim 9, characterized in that: The nano adsorption unit (9) further includes support rods (99) symmetrically arranged on both sides of the processing box (1), a third support plate (910) is fixedly connected to the top of the support rods (99), telescopic rods (911) are symmetrically arranged at the bottom of the third support plate (910), and a partition plate (912) is fixedly connected to the bottom of the telescopic rods (911).

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