Integrated algal-bacterial symbiotic system suitable for advanced sewage treatment

Abstract

The utility model provides an integrated bacteria-algae symbiotic system suitable for advanced sewage treatment, which is used for solving the problem that activated sludge can shield light of a light supplementing mechanism in the prior art. Comprising a first treatment tank, a stirring device, an aeration assembly, a water inlet formed in the bottom of the first treatment tank, a water outlet formed in the top of the first treatment tank, a mounting bracket arranged in the first treatment tank, a plurality of light supplementing assemblies and a plurality of microalgae assemblies, the light supplementing assembly is arranged in the bacteria and algae biological area, and the bacteria and algae biological area is far away from the bottom of the first treatment pond, so that the problem that large-particle pollutants or sludge in sewage is deposited on the light supplementing assembly to influence photosynthesis of bacteria and algae can be avoided. In addition, the sewage is stirred through the stirring device, mixing of the sewage, the activated sludge and the microalgae can be promoted, full contact of the sewage, the activated sludge and the microalgae can be achieved, and therefore the sewage treatment effect can be improved.

Description

Technical Field

[0001] The utility model belongs to the field of sewage treatment, in particular to an integrated bacteria-algae symbiotic system suitable for deep sewage treatment. Background Art

[0002] With the rapid development of urbanization and the popularization of the concept of water resource protection, my country's municipal sewage treatment and discharge standards are becoming increasingly stringent. Due to factors such as outdated technology and overloaded treatment, some sewage treatment plants are experiencing substandard effluent. Substandard effluent contains large amounts of pollutants such as nitrogen and phosphorus. When discharged into natural water bodies such as rivers and lakes, it causes eutrophication, seriously endangering the safety of the water environment. Deep treatment is urgently needed to achieve water quality standards. Currently, deep sewage treatment in most parts of my country generally involves adding deep treatment workshops and processes. This has high construction costs, increases overall treatment time, and consumes high amounts of electricity and aeration energy. Some deep treatment processes also require large amounts of carbon sources, polyaluminum chloride, and other chemicals to enhance nitrogen and phosphorus removal. This not only increases operation and maintenance costs, but also generates direct and indirect carbon emissions, exacerbating the greenhouse effect.

[0003] The treatment process based on the algal-bacterial symbiosis (ABS) system is an emerging technology for deep sewage treatment. Its main principle is that algae absorb CO2 released by the respiration of activated sludge bacteria through photosynthesis, use nutrients such as nitrogen and phosphorus in the water to synthesize their own cellular substances, and release O2 for bacterial respiration. This technology can achieve deep removal of organic matter and pollutants such as ammonia nitrogen, nitrate nitrogen and total phosphorus.

[0004] Prior art discloses a sewage treatment device based on bacterial-algal symbiosis. This device employs a lighting mechanism, an aeration mechanism, and a filler within a reaction vessel with a water inlet. The lighting mechanism is located at the bottom of the reaction vessel to provide illumination for the bacterial-algal symbiosis zone. The aeration mechanism and filler are arranged sequentially in this zone, from bottom to top, while the filler is filled with activated sludge and microalgae. During use, this device, due to its own weight, can deposit on the lighting mechanism at the bottom of the reaction vessel, obstructing the light from the lighting mechanism. This, in turn, prevents photosynthesis in the microalgae and bacteria within the activated sludge, preventing the conversion of nutrients (nitrogen and phosphorus) in the sewage, and thus impacting the sewage treatment effect. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide an integrated bacteria-algae symbiotic system suitable for deep sewage treatment, which is used to solve the problem in the prior art that activated sludge will block the light of the light-filling mechanism.

[0006] To achieve the above-mentioned objectives and other related objectives, the present invention provides an integrated bacteria-algae symbiotic system suitable for deep treatment of sewage, comprising: a first treatment tank, a stirring device and an aeration component, a water inlet arranged at the bottom of the first treatment tank, a water outlet arranged at the top of the first treatment tank, a mounting bracket arranged in the first treatment tank, multiple light-filling components and multiple microalgae components; the first treatment tank is composed of an activated sludge zone, a stirring zone and a bacteria-algae biological zone from bottom to top, and activated sludge is arranged in the activated sludge zone; the fixed end of the stirring device is arranged at the top of the first treatment tank, and its output end is located in the stirring zone for stirring sewage; the mounting bracket is arranged on the inner side wall of the first treatment tank, and multiple light-filling components and multiple microalgae components are arranged at intervals on the mounting bracket; the output end of the aeration component is located in the bacteria-algae biological zone for transporting dissolved oxygen to the bacteria-algae biological zone.

[0007] Optionally, the mounting bracket includes a plurality of mounting columns, the central axes of the mounting columns being arranged parallel to the inner wall of the first treatment tank; the fill light assembly and the microalgae assembly being arranged at intervals on the mounting columns; and along the extension direction of the mounting columns, at least one fill light assembly is arranged between two microalgae assemblies arranged on the same mounting column.

[0008] Optionally, along the radial direction of the mounting column, at least two microalgae assemblies are symmetrically arranged on the mounting column with the central axis of the mounting column as a symmetry line.

[0009] Optionally, the microalgae assembly includes a mounting member, a photocatalyst carrier plate, and a plurality of microalgae filler carriers; the photocatalyst carrier plate and the plurality of microalgae filler carriers are mounted on the mounting post via the mounting member.

[0010] Optionally, the microalgae filler carrier is a porous columnar structure, and a plurality of microalgae filler carriers are installed in a divergent manner on the photocatalyst carrier plate.

[0011] Optionally, the mounting member is connected to the mounting post by threading.

[0012] Optionally, a sewage pipe for discharging sludge is also provided at the bottom of the first treatment tank.

[0013] Optionally, it also includes a second treatment tank and a water transfer component; the second treatment tank is used to temporarily store sewage; the water transfer component is used to transfer the sewage in the second treatment tank to the first treatment tank through the water inlet set at the bottom of the first treatment tank.

[0014] Optionally, the water transfer assembly includes a submersible sewage pump and a water transfer pipe. The submersible sewage pump is arranged at the bottom of the second treatment tank. One end of the water transfer pipe is connected to the submersible sewage pump, and the other end is connected to the water inlet of the second sub-treatment tank.

[0015] Optionally, it also includes a walkway plate and a ladder, the walkway plate is arranged on the top of the first treatment tank, and the ladder is arranged on the outer side wall of the treatment tank and connected to the walkway plate.

[0016] As described above, the present invention's integrated bacteria-algae symbiotic system for advanced sewage treatment has at least the following beneficial effects: by placing the supplemental light component within the bacteria-algae biozone, located away from the bottom of the first treatment tank, it prevents large pollutants or sludge in the sewage from settling on the supplemental light component and affecting photosynthesis. Furthermore, this embodiment utilizes a stirring device to agitate the sewage, promoting mixing and ensuring full contact between the sewage, activated sludge, and microalgae, thereby improving sewage treatment effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a structural schematic diagram of an integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to the present invention.

[0018] Figure 2 Shown is a top view schematic diagram of an integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to the present invention.

[0019] Figure 3 Shown is a schematic structural diagram of a microalgae component of an integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to the present invention. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0021] Please refer to all the following drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size, without affecting the efficacy and purpose that can be achieved by this utility model, should still fall within the scope of the technical content disclosed by this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this utility model without substantially changing the technical content.

[0022] The following embodiments are for illustration only and can be combined with each other, and are not limited to the contents presented in the following single embodiments.

[0023] See also Figure 1-2The utility model provides an integrated bacteria-algae symbiotic system suitable for deep treatment of sewage, comprising: a first treatment tank 1, a stirring device 2 and an aeration component 3, a water inlet arranged at the bottom of the first treatment tank 1, a water outlet 11 arranged at the top of the first treatment tank 1, a mounting bracket 12, a plurality of fill-light components 13 and a plurality of microalgae components 14 arranged in the first treatment tank 1; the first treatment tank 1 is composed of an activated sludge zone, a stirring zone and a bacteria-algae biological zone from bottom to top, and activated sludge is arranged in the activated sludge zone; the fixed end of the stirring device 2 is arranged at the top of the first treatment tank 1, and the output end thereof is located in the stirring zone for stirring sewage; the mounting bracket 12 is arranged on the inner side wall of the first treatment tank 1, and the plurality of fill-light components 13 and the plurality of microalgae components 14 are arranged at intervals on the mounting bracket 12; the output end of the aeration component 3 is located in the bacteria-algae biological zone for transporting dissolved oxygen to the bacteria-algae biological zone.

[0024] A walkway board 6 may be provided at the top of the first treatment tank 1, and a ladder 7 may be provided on the outer wall of the first treatment tank 1. Workers can climb up the walkway board 6 via the ladder 7 to facilitate maintenance of the fill light assembly 13 and other parts in the first treatment tank 1. The stirring device 2 may include a motor, a drive shaft, and stirring blades. The motor is provided on the walkway board 6, the drive shaft is coaxially provided on the motor shaft of the motor, and the stirring blades are provided at the end of the drive shaft away from the motor. The drive shaft passes through the bacterial and algal biozone so that the stirring blades are located within the stirring zone.

[0025] Aeration assembly 3 may include an air pump, an air pipe, and an aeration plate. The air pump may be mounted on the outer wall of first treatment tank 1. One end of the air pipe is connected to the air pump, and the other end is connected to the aeration plate. The aeration plate is located within the bacterial and algal biozone. Furthermore, outlet 11 may be provided with a drain pipe or gutter for discharging treated sewage, thereby facilitating the discharge of treated sewage.

[0026] During use, sewage enters the bottom of the first treatment tank 1 through the water inlet provided therein. A stirring device 2 then stirs the sewage, promoting mixing and ensuring full contact between the sewage, activated sludge, and microalgae. Simultaneously, a light-filling component 13 illuminates the microalgae component 14, facilitating photosynthesis by aerobic bacteria in the activated sludge and algae on the microalgae component 14. Furthermore, an aeration component 3 supplies dissolved oxygen to the bacterial and algal biozone, providing sufficient oxygen for the metabolism of the aerobic bacteria in the activated sludge and the algae and other microorganisms on the microalgae component 14, thereby maintaining the biological activity of the system. After being processed from bottom to top by the aerobic bacteria in the activated sludge and the algae and other microorganisms on the microalgae component 14, the sewage is discharged from the first treatment tank 1 through the outlet 11.

[0027] In one embodiment, the mounting bracket 12 includes a plurality of mounting posts 121, the central axes of which are arranged parallel to the inner sidewalls of the first treatment tank 1. The fill light assembly 13 and the microalgae assembly 14 are spaced apart on the mounting posts 121. Along the extension direction of the mounting posts 121, at least one fill light assembly 13 is disposed between two microalgae assemblies 14 disposed on the same mounting post 121. The mounting bracket 12 may also include a plurality of crossbeams, each end of which is connected to the sidewalls of the first treatment tank 1. The mounting posts 121 are perpendicularly mounted on the crossbeams, such that the central axes of the mounting posts 121 are arranged parallel to the inner sidewalls of the first treatment tank 1. The fill light assembly 13 may be a fill light assembly 13 comprising a plurality of LED lamps, which may be mounted directly on the inner sidewalls of the mounting posts 121, or the LED lamps may be mounted on a mounting plate, which is then used to mount the LED lamps on the mounting posts 121. This embodiment is not limited to this aspect. In this embodiment, at least one supplementary light assembly 13 is provided between every two microalgae assemblies 14 to ensure that the algae on the microalgae assemblies 14 can perform photosynthesis and avoid dead corners.

[0028] Along the radial direction of the mounting post 121, at least two microalgae assemblies 14 are symmetrically arranged on the mounting post 121 with the central axis of the mounting post 121 as the symmetry line. After each microalgae assembly 14 is mounted on the mounting post 121, the central axis of each microalgae assembly 14 is perpendicular to the central axis of the mounting post 121. Figure 2 In the embodiment, in a cross section of the mounting post 121 parallel to the horizontal plane, two microalgae assemblies 14 are symmetrically mounted on the mounting post 121, i.e., one microalgae assembly 14 is located on one side of the mounting post 121, and the other microalgae assembly 14 is located on the other side of the mounting post 121. In other implementations, in a cross section of the mounting post 121 parallel to the horizontal plane, four microalgae assemblies 14 are mounted on the same mounting post 121, and the four microalgae assemblies 14 are arranged in a ring around the mounting post 121 to ensure that the microalgae assemblies 14 are arranged on all four sides of the mounting post 121, ensuring that the bacteria and algae are evenly distributed within the bacterial and algal biozone and avoiding dead corners.

[0029] See also Figure 3The microalgae component 14 may include a mounting member 141, a photocatalyst carrier 142 and a plurality of microalgae filler carriers 143; the photocatalyst carrier 142 and the plurality of microalgae filler carriers 143 are mounted on the mounting column 121 through the mounting member 141. The mounting member 141 may be an annular fixed plate, one end of which is provided with a threaded collar, and the other end is used to mount the photocatalyst carrier 142. The corresponding mounting column 121 is provided with a threaded structure connected to the threaded collar, so that the mounting member 141 can be mounted on the mounting column 121. The photocatalyst carrier 142 is a carrier that carries the photocatalyst, which can be made by ultrasonic method, that is, by ultrasonically dispersing the photocatalyst powder in water to obtain a suspension, immersing the carrier in the suspension, ultrasonicating again to evenly distribute the catalyst, and then drying in a dry oven. After the carrier is completely dried, the photocatalyst carrier 142 loaded with the photocatalyst is obtained. Alternatively, the photocatalyst substrate 142 may be formed by a sol-gel method, whereby photocatalyst powder is dissolved in a solvent to form a sol, a carrier is immersed in the sol, a gel is formed through hydrolysis and polycondensation, and finally, a heat treatment is performed to obtain the photocatalyst carrier 142 loaded with the photocatalyst. Furthermore, the photocatalyst of this embodiment may be made of materials such as titanium dioxide (TiO2), zinc oxide (ZnO), and graphite-like carbon nitride (g-C3N4). During use, the materials such as titanium dioxide (TiO2), zinc oxide (ZnO), and graphite-like carbon nitride (g-C3N4) absorb and convert light, converting ultraviolet and infrared rays that are originally ineffective against microalgae into effective photosynthetic light, thereby expanding the spectrum range available to the microalgae.

[0030] The microalgae filler carrier 143 can be a porous columnar structure, with multiple microalgae filler carriers 143 mounted in a diverging pattern on the photocatalyst carrier plate 142. Specifically, the microalgae filler carrier 143 can be a columnar structure composed of algae and filler mixed in a certain proportion to form a porous gel. The porous gel prevents the algae from moving freely, allowing dominant algae to grow and reproduce within the porous gel, preventing loss and facilitating the cultivation of dominant populations. This increases mechanical strength while also forming a microbial community system with a specific distribution. The multiple microalgae filler carriers 143 are spaced apart at one end on the photocatalyst carrier plate 142, while the other ends are arranged in a diverging pattern. This increases the contact area between the microalgae filler carriers 143 and the sewage, ensuring that all sewage in the first treatment tank 1 is treated.

[0031] In one embodiment, a drain pipe 15 for discharging sludge is further provided at the bottom of the first treatment tank 1. Since mud or large particulate pollutants in the sewage may settle at the bottom of the first treatment tank 1 during the sewage treatment process, the drain pipe 15 is provided at the bottom of the first treatment tank 1 in this embodiment. The drain pipe 15 can be used to remove the mud and other pollutants that have settled at the bottom of the first treatment tank 1.

[0032] In one embodiment, it also includes a second treatment tank 4 and a water transfer assembly 5; the second treatment tank 4 is used to temporarily store sewage; the water transfer assembly 5 is used to transfer the sewage in the second treatment tank 4 to the first treatment tank 1 through the water inlet set at the bottom of the first treatment tank 1. When in use, the sewage first enters the second treatment tank 4 for temporary storage, and after being homogenized and weighed, the sewage is transferred to the first treatment tank 1 by the water transfer assembly 5. The provision of the second treatment tank 4 can effectively prevent the water quality and water volume of the sewage from fluctuating greatly, which would cause the biological stability in the bacterial and algal biozone to decrease. In addition, it can also play a role in preliminary precipitation, thereby removing some large particle pollutants. In one implementation, the first treatment tank 1 and the second treatment tank 4 can be two sub-treatment tanks formed by a larger treatment tank separated by a baffle. The baffle can be a baffle made of acrylic material to facilitate installation or removal when the treatment tank has other uses.

[0033] The water transfer assembly 5 may include a submersible sewage pump 51 and a water transfer pipe 52. The submersible sewage pump 51 is arranged at the bottom of the second treatment tank 4. One end of the water transfer pipe 52 is connected to the submersible sewage pump 51, and the other end is connected to the water inlet of the second sub-treatment tank. The water transfer pipe 52 can be divided into an outlet pipe and an inlet pipe. One end of the outlet pipe is connected to the submersible sewage pump 51, and the other end is located on the walkway plate 6. One end of the inlet pipe is connected to the water inlet of the first treatment tank 1, and the other end is located on the walkway plate 6. The end of the outlet pipe away from the submersible sewage pump 51 is connected to the end of the inlet pipe away from the water inlet of the first treatment tank 1 by a flange to facilitate maintenance of the inlet and outlet pipes. It is understandable that the water inlet described in this embodiment can be a physical structure such as a pipe interface arranged at the bottom of the first treatment tank 1, or it can be a structure formed integrally with the water inlet pipe, that is, the end of the water inlet pipe that extends into the first treatment tank 1 is the water inlet referred to in this embodiment.

[0034] The mutually beneficial symbiotic relationship between aerobic bacteria and microalgae within the activated sludge of the integrated bacteria-algae symbiotic system for advanced sewage treatment described in this utility model is manifested in the release and absorption of oxygen and metabolites. The microalgae, through the synthesis of specialized LED lights for algae cultivation, produce O2, which increases the dissolved oxygen in the sewage for aerobic bacterial respiration. This effectively reduces external aeration volume during the treatment process, lowering fan energy consumption and saving operating costs. Furthermore, the CO2 produced by aerobic bacterial respiration is used by the microalgae for photosynthesis, enabling internal absorption of greenhouse gases within the system, effectively reducing direct carbon emissions generated by the system during the treatment process.

[0035] Aerobic bacteria in the activated sludge in the system absorb and utilize large organic carbon-containing molecular pollutants in the sewage through respiration to synthesize substances needed for their own nutrition. At the same time, they secrete hydrolases such as lipase, phosphatase, glucosidase, lactase, etc. These enzymes can hydrolyze large molecular organic matter such as polysaccharides and proteins in sewage into small molecular substances, which are then absorbed and utilized by microalgae. While efficiently removing carbon-containing pollutants such as COD and BOD in sewage, the yield of microalgae is increased.

[0036] During sewage treatment, the nitrogen and phosphorus in the wastewater are oxidatively degraded by ammonifying bacteria within the activated sludge and assimilated by algae. First, the bacteria ammonify nitrogenous organic matter, followed by nitrification by aerobic bacteria, producing inorganic nitrogenous compounds such as ammonia nitrogen, nitrite, and nitrate. Microalgae, aided by enzymes, then absorb the nitrogenous compounds into their cells. Under catalytic action, they use ATP to reduce the nitrogenous compounds to ammonium, which they then use for their own growth.

[0037] Phosphorus is also an essential element in the growth of microalgae. Microalgae use CO2 produced by aerobic bacteria as carbon source and degrade phosphorus-containing organic matter in sewage through photosynthesis to produce HPO4. 2- and H2PO4 - Compared to traditional activated sludge processes, the bacteria-algae symbiotic system described in this invention can achieve efficient nitrogen and phosphorus removal without adding a recirculation process or adding various chemicals. This not only facilitates operation and management, reduces costs, but also reduces indirect carbon emissions caused by the addition of various chemicals.

[0038] The bacteria-algae symbiotic system described in this utility model features simple and rational processes and is easy to operate. Combining the activated sludge process with bacteria-algae symbiotic treatment technology, while ensuring that all effluent indicators at the sewage treatment plant meet stable standards, it can reduce fan aeration volume through algae photosynthesis to save energy and reduce consumption. It can also reduce the system's carbon emissions by absorbing and utilizing greenhouse gases within the system. This system offers the advantages of being low-carbon, economical, and environmentally friendly, providing a low-cost, easy-to-build, and effective solution for upgrading the deep treatment standards of sewage treatment plants.

[0039] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. An integrated bacteria-algae symbiotic system suitable for deep sewage treatment, characterized in that: include: A first treatment tank, a stirring device and an aeration assembly, a water inlet provided at the bottom of the first treatment tank, a water outlet provided at the top of the first treatment tank, a mounting bracket provided in the first treatment tank, a plurality of supplementary light assemblies, and a plurality of microalgae assemblies; The first treatment tank is composed of an activated sludge zone, a stirring zone, and a bacterial and algal biozone from bottom to top. Activated sludge is provided in the activated sludge zone. The fixed end of the stirring device is provided at the top of the first treatment tank, and the output end thereof is located in the stirring zone for stirring sewage. The mounting bracket is arranged on the inner wall of the first treatment tank, and the plurality of the supplementary light components and the plurality of the microalgae components are arranged on the mounting bracket at intervals; The output end of the aeration component is located in the bacteria and algae bioregion and is used for delivering dissolved oxygen to the bacteria and algae bioregion.

2. The integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to claim 1, characterized in that: The mounting bracket includes a plurality of mounting columns, wherein the central axes of the mounting columns are arranged parallel to the inner side wall of the first treatment tank; The fill light assembly and the microalgae assembly are arranged on the mounting post at intervals; along the extension direction of the mounting post, at least one fill light assembly is arranged between two microalgae assemblies arranged on the same mounting post.

3. The integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to claim 2, characterized in that: Along the radial direction of the mounting column, at least two microalgae assemblies are symmetrically arranged on the mounting column with the central axis of the mounting column as a symmetry line.

4. The integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to claim 2 or 3, characterized in that: The microalgae assembly includes a mounting member, a photocatalyst carrier plate, and a plurality of microalgae filler carriers; the photocatalyst carrier plate and the plurality of microalgae filler carriers are mounted on the mounting column via the mounting member.

5. The integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to claim 4, characterized in that: The microalgae filler carrier is a porous columnar structure, and a plurality of the microalgae filler carriers are installed on the photocatalyst carrier in a divergent manner.

6. The integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to claim 4, characterized in that: The mounting piece is connected to the mounting post by threading.

7. The integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to claim 1, characterized in that: A sewage pipe for discharging sludge is also provided at the bottom of the first treatment tank.

8. The integrated bacteria-algae symbiotic system suitable for advanced sewage treatment according to claim 1, characterized in that: It also includes a second treatment tank and a water transfer component; the second treatment tank is used to temporarily store sewage; the water transfer component is used to transfer the sewage in the second treatment tank to the first treatment tank through the water inlet set at the bottom of the first treatment tank.

9. The integrated bacteria-algae symbiotic system suitable for advanced sewage treatment according to claim 8, characterized in that: The water transfer assembly includes a submersible sewage pump and a water transfer pipe. The submersible sewage pump is arranged at the bottom of the second treatment tank. One end of the water transfer pipe is connected to the submersible sewage pump, and the other end is connected to the water inlet of the second treatment tank.

10. The integrated bacteria-algae symbiotic system suitable for deep sewage treatment according to claim 1, characterized in that: It also includes a walkway plate and a ladder. The walkway plate is arranged on the top of the first treatment tank, and the ladder is arranged on the outer side wall of the treatment tank and connected to the walkway plate.

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