A wastewater treatment device based on algal-bacterial symbiotic photobioreactor

Abstract

This invention relates to the field of wastewater treatment technology, and more particularly to a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor, comprising: a mounting frame and a treatment tank fixed inside the mounting frame. The treatment tank contains a reaction assembly, which includes a drive rod and a reaction spiral blade. The drive rod is vertically positioned inside the treatment tank, and the reaction spiral blade is fitted onto the drive rod. The reaction spiral blade has reaction holes and contains a biological reaction layer. A collection hood, shaped like an inverted frustum, is located at the bottom of the treatment tank. Two symmetrical outlets are located at the bottom of the collection hood. A collection assembly, comprising a sealing ring, a guide ring, a movable rod, and a collection box, is located below the collection hood. The sealing ring is fixedly connected to the bottom side of the collection hood. This invention causes the generated sediment to converge centripetally at the bottom of the treatment tank, avoiding the formation of eddy current dead zones.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor. Background Technology

[0002] With industrial development and urbanization, wastewater discharge continues to increase. Traditional biological treatment methods have drawbacks such as long treatment cycles, low removal efficiency of recalcitrant organic matter, large sludge production, high operating energy consumption, and susceptibility to secondary pollution. Algae-bacteria symbiotic systems utilize the oxygen produced by microalgae photosynthesis to provide oxygen for heterotrophic bacteria, while the heterotrophic bacteria decompose organic matter to provide carbon and nutrients for microalgae, forming a synergistic metabolic system. This system combines the advantages of pollution control, carbon reduction, and resource recovery, making it a new type of water treatment technology.

[0003] Patent CN202010130281.8 discloses a device and method for treating high-salinity wastewater combining a bacterial-algal symbiosis method with a membrane biofilm reactor. The device includes a membrane biofilm reactor, a gas separation membrane, a bacterial-algal symbiotic biofilm, and a light source. The membrane biofilm reactor is a transparent cavity with an air inlet pipe and a water outlet pipe at the top and an water inlet pipe and an air outlet pipe at the bottom. The gas separation membrane is cast into a membrane module and placed inside the cavity, with the air inlet pipe and air outlet pipe connected to both ends of the module. A bacterial-algal symbiotic biofilm grows on the surface of the gas separation membrane. The light source is located outside the cavity to uniformly irradiate the membrane biofilm reactor. This invention combines a bacterial-algal symbiosis system with membrane biotechnology, overcoming the technical shortcomings of traditional processes for treating high-salinity wastewater, such as poor bacterial salt tolerance, low nitrogen and phosphorus removal rates, and high operating energy consumption.

[0004] However, existing equipment generates a large amount of sediment when treating wastewater. This sediment needs to be cleaned up in a timely manner, otherwise it will reduce the treatment efficiency and cause secondary pollution. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A wastewater treatment device based on an algae-bacterial symbiotic photobioreactor includes: a mounting frame and a treatment tank fixed inside the mounting frame. The treatment tank is equipped with a reaction assembly, which includes a drive rod and a reaction spiral blade. The drive rod is vertically installed inside the treatment tank, and the reaction spiral blade is sleeved on the drive rod. The reaction spiral blade has reaction holes and a biological reaction layer inside. The bottom of the processing tank is provided with a collection cover, which is in the shape of an inverted frustum. The collection hood has two symmetrical outlets at its bottom. A collection assembly is provided below the collection hood. The collection assembly includes a sealing ring, a guide ring, a movable rod, and a collection box. The sealing ring is fixedly connected to the bottom side of the collection hood. The movable rod is fixedly connected to the bottom side of the middle part of the collection hood. The guide ring is fixedly connected to the middle part of the movable rod. The collection box is fixedly connected to the bottom end of the movable rod. The movable rod is used to drive the guide ring to move up and down and to control the opening and closing of the gap between the sealing ring and the guide ring.

[0007] Preferably, the treatment tank includes a tank body, an isolation cover, an inlet pipe, and an outlet pipe. The isolation cover is fixedly fitted on the outside of the tank body, and a constant temperature space is formed between the isolation cover and the tank body. The inlet pipe is fixedly connected to the upper side of the tank body and the isolation cover, and the outlet pipe is fixedly connected to the lower side of the tank body.

[0008] Preferably, the reaction assembly further includes a drive module and a sealing plate. The sealing plate is fixedly connected to the upper part of the inside of the processing tank, the drive module is fixedly installed between the sealing plate and the top wall of the tank, and the drive rod is fixedly connected to the drive end of the drive module.

[0009] Preferably, two partitions are fixedly connected between the tank body and the isolation cover, and the space between the two partitions is an outlet space. Multiple guide ports are circumferentially opened on the bottom side of the tank body. The guide ports are located on the side of the outlet space. The side of the guide port closer to the reaction spiral blade is larger than the other side, and the guide ports are inclined.

[0010] Preferably, the tank is equipped with a cleaning component for cleaning the upper surface of the collection hood.

[0011] Preferably, the cleaning assembly includes a rotating ring, multiple guide plates, and multiple cleaning strips. A rotating groove is provided on the inner side of the tank. The rotating ring is rotatably disposed inside the rotating groove. Multiple guide plates are fixedly connected in a ring shape to the inner side of the rotating ring to form a guide wheel. Multiple cleaning strips are fixedly connected below the guide plates and are in contact with the upper surface of the collection hood.

[0012] Preferably, a material guiding device is provided on the upper side of the treatment tank, which is used to introduce the treatment agent into the treatment tank.

[0013] Preferably, the material guiding device includes a material guiding tank, a connecting module, and multiple spray holes. The material guiding tank is fixedly connected to the upper end of the processing tank. The connecting module is rotatably connected between the material guiding tank and the driving module. A material guiding channel is opened in the middle of the driving rod, and the material guiding tank is connected to the material guiding channel through a connecting pipe. The multiple spray holes are symmetrically arranged on both sides of the driving rod and are connected to the material guiding channel.

[0014] Preferably, the bottom of the treatment tank is provided with a backflushing device, which includes a cleaning pipe and a connecting pump. The cleaning pipe is an annular pipe and is located below the collection hood. The output end of the connecting pump is connected to the cleaning pipe.

[0015] Preferably, the sealing ring is configured as a variable diameter ring with a larger diameter at the bottom and a smaller diameter at the top, and the guide ring is made of elastic material with an inclined side for sealing the variable diameter part that contacts the sealing ring.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. The rotating reaction helical blade generates forced turbulence, which can disrupt the water boundary layer. At the same time, the reaction helical blade forms axial thrust as it spirals, which can extend the water flow path and ensure uniform hydraulic residence time. The multiple reaction holes of the reaction helical blade achieve cross-flow contact, and the wastewater repeatedly passes through the biological reaction layer, causing pollutants to collide and be adsorbed with bacteria multiple times. The biological reaction layer fixes algae and bacteria, preventing loss and continuously and efficiently degrading pollutants. 2. The upper surface of the inverted truncated cone slope causes sludge particles to slide towards the center under the influence of gravity along the slope, overcoming the adhesion force and causing the generated sediment to form a centripetal flow at the bottom of the treatment tank, avoiding the formation of eddy dead zones. 3. The rotating cleaning strip generates shearing and scraping force, which destroys the sludge adhesion structure. The guide plate rotates at a relatively slow speed, and the cleaning strip gently scrapes away the accumulated sediment without disturbing the reaction zone. The cleaning strip moves the scraped sediment to the guide outlet, thereby ensuring the discharge and collection of the sediment. 4. By introducing the treatment agent inside the feed tank into the feed channel, the centrifugal force is used to throw the treatment agent to all sides through the rotation of the center of the drive rod. Since the treatment agent rotates synchronously with the reaction components, the addition is synchronized with the turbulence, and the mixture is uniform in an instant with a very short mixing time, ensuring the uniform addition of the treatment agent. 5. The ring-shaped cleaning pipe enables the upward spraying of water in a ring shape, forming a backwash flow field that covers the entire area inside the treatment tank. At the same time, the high-pressure water flow during backwashing generates impact shearing force, which peels off the scale and aged biofilm. The high-pressure water flow also impacts the area below the collection hood, causing the collection hood to move upward, thereby keeping the collection component in a sealed state, maintaining pressure during cleaning, and preventing pressure from leaking. 6. The variable diameter sealing ring and the guide ring with elastic inclined edges form an adaptive surface seal, which can automatically switch between sealing in three working conditions: sediment collection, wastewater reaction treatment and backwashing, without manual intervention. The sealing reliability is far higher than that of traditional flange and gasket seals. Attached Figure Description

[0017] Figure 1 This is a front structural schematic diagram of a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor proposed in this invention. Figure 2This is a schematic diagram of the front structure of the treatment tank of a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor proposed in this invention. Figure 3 This is a schematic diagram of the internal cross-sectional structure of a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor proposed in this invention. Figure 4 This is a schematic cross-sectional view of the treatment tank of a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor proposed in this invention. Figure 5 This is a schematic diagram of the reaction component structure of a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor proposed in this invention. Figure 6 This is a schematic diagram of the cleaning component structure of a wastewater treatment device based on an algae-bacterial symbiotic photobioreactor proposed in this invention; Figure 7 This is a schematic diagram of the collection component structure of a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor proposed in this invention; Figure 8 This is a schematic diagram of the inlet structure of a wastewater treatment device based on an algae-bacteria symbiotic photobioreactor proposed in this invention.

[0018] In the diagram: 1. Mounting frame; 2. Processing tank; 21. Tank body; 22. Isolation cover; 23. Inlet pipe; 24. Outlet pipe; 3. Reaction assembly; 31. Drive rod; 32. Reaction spiral blade; 33. Drive module; 34. Sealing plate; 4. Collection cover; 5. Collection assembly; 51. Sealing ring; 52. Guide ring; 53. Movable rod; 54. Collection box; 6. Cleaning assembly; 61. Rotating ring; 62. Guide plate; 63. Cleaning strip; 7. Material guiding device; 71. Material guiding tank; 72. Connecting module; 73. Spray nozzle; 8. Backflushing device; 81. Cleaning pipe; 82. Connecting pump; 9. Baffle plate; 10. Flow port. Detailed Implementation

[0019] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0020] The terms used in this invention, such as "upper," "lower," "left," "right," "middle," and "one," are merely for clarity of description and are not intended to limit the scope of the invention. Any changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0021] Reference Figures 1-8A wastewater treatment device based on an algae-bacterial symbiotic photobioreactor includes: a mounting frame 1 and a treatment tank 2 fixed inside the mounting frame 1. The treatment tank 2 is equipped with a reaction component 3. The reaction component 3 includes a drive rod 31 and a reaction spiral blade 32. The drive rod 31 is vertically installed inside the treatment tank 2. The reaction spiral blade 32 is sleeved on the drive rod 31. The reaction spiral blade 32 has reaction holes and a biological reaction layer is provided inside. The biological reaction layer is a porous packing material, a biofilm carrier, a sponge or a fiber bundle, and is equipped with an algae-bacterial symbiotic community. The bottom of the processing tank 2 is provided with a collection cover 4, which is a frustum-shaped inverted cylinder. The collection cover 4 has two symmetrical outlets at its bottom. A collection assembly 5 is provided below the collection cover 4. The collection assembly 5 includes a sealing ring 51, a guide ring 52, a movable rod 53, and a collection box 54. The sealing ring 51 is fixedly connected to the bottom side of the collection cover 4. The movable rod 53 is fixedly connected to the bottom side of the middle part of the collection cover 4. The guide ring 52 is fixedly connected to the middle part of the movable rod 53. The collection box 54 is fixedly connected to the bottom end of the movable rod 53. The movable rod 53 is used to drive the guide ring 52 to move up and down, and to control the opening and closing of the gap between the sealing ring 51 and the guide ring 52.

[0022] In the embodiments of the above technical solution, due to insufficient contact between wastewater and algae biofilm, low mass transfer efficiency, and uneven reaction, insufficient mass transfer will directly lead to low removal rates of organic matter, nitrogen and phosphorus, and the treatment will not meet the standards. The rotating reaction spiral blade 32 generates forced turbulence, which can disrupt the water boundary layer. At the same time, the reaction spiral blade 32 forms axial thrust as it spirals, which can extend the water flow path and ensure uniform hydraulic residence time. The multiple reaction holes of the reaction spiral blade 32 achieve cross-flow contact, and the wastewater repeatedly passes through the biological reaction layer, causing pollutants to collide and be adsorbed with bacteria multiple times. The biological reaction layer fixes algae and bacteria, preventing loss and continuously and efficiently degrading pollutants.

[0023] In the existing technology, the precipitate is dispersed and deposited, which easily leads to the precipitate sticking to the side wall of the treatment tank 2, making it difficult to collect the precipitate. The dispersed deposition leads to cleaning dead corners, and long-term accumulation and blockage of the flow channel will also reduce the reaction efficiency. The upper surface of the inverted truncated cone slope causes sludge particles to slide towards the center under the influence of gravity along the slope, overcoming adhesion and causing the resulting sediment to form a centripetal flow at the bottom of treatment tank 2, thus avoiding the formation of eddy dead zones.

[0024] The preferred technical solution in this embodiment is: Reference Figure 1 and Figure 2The treatment tank 2 includes a tank body 21, an isolation cover 22, an inlet pipe 23, and an outlet pipe 24. The isolation cover 22 is fixedly sleeved on the outside of the tank body 21, and a constant temperature space is formed between the isolation cover 22 and the tank body 21. The inlet pipe 23 is fixedly connected to the upper side of the tank body 21 and the isolation cover 22, and the outlet pipe 24 is fixedly connected to the lower side of the tank body 21. An LED light source is installed on the outside of the tank body 21, and a light intensity control module is installed.

[0025] Fluctuations in ambient temperature can reduce the activity of algae and bacteria inside treatment tank 2, resulting in unstable treatment effects. Since the algae-bacterial symbiotic system is sensitive to temperature, deviations from the optimal temperature range can lead to a sharp drop in biological activity. The double-layer jacket structure of tank 21 and isolation cover 22 forms a static air or water bath insulation layer. The constant temperature medium circulates in the jacket to maintain a stable temperature inside the tank. The constant temperature space keeps the temperature within the optimal range for algae and bacteria, ensuring a high rate of enzymatic reaction and rapid substrate degradation.

[0026] Reference Figure 5 The reaction assembly 3 also includes a drive module 33 and a sealing plate 34. The sealing plate 34 is fixedly connected to the upper part of the inside of the processing tank 2. The drive module 33 is fixedly installed between the sealing plate 34 and the top wall of the tank 21. The drive rod 31 is fixedly connected to the drive end of the drive module 33. The drive module 33 controls the drive rod 31 to rotate, thereby driving the reaction spiral blade 32 to rotate. At the same time, the sealing plate 34 seals the inside of the treatment tank 2 in layers to prevent wastewater from entering the drive module 33 and causing damage to the drive module 33.

[0027] Reference Figure 4 and Figure 8 Two partitions 9 are fixedly connected between the tank body 21 and the isolation cover 22, and the space between the two partitions 9 is the outlet space. Multiple guide ports 10 are provided in a ring shape on the bottom side of the tank body 21. The guide ports 10 are located on the side of the outlet space. The side of the guide port 10 closer to the reaction spiral blade 32 is larger than the other side, and the guide port 10 is inclined. Because the effluent will carry sediment, the sediment will clog the effluent pipe 24, reducing the quality of the effluent. The presence of mud in the effluent will increase the load on subsequent treatment and make it impossible to meet the discharge standards.

[0028] Because the multiple guide ports 10 adopt a variable diameter design with a larger inner diameter and a smaller outer diameter, and are also set with an inclined angle, centrifugal separation will be formed during the movement of water flow. The rotation of the reaction spiral blade 32 makes the whole tank form a rotating flow field. Under the action of centrifugal force, the sludge particles migrate to the tank wall and slide down the wall to the collection hood 4, realizing reaction and separation at the same time. Meanwhile, since the guide port 10 adopts an inner large and outer small, inclined and clockwise arrangement, which is consistent with the direction of the rotating flow field, the inner large opening is directly facing the trajectory of the particles thrown out by centrifugal force, and the outer small opening forms a throttling effect, which increases the local swirling intensity. The inclined angle causes heavy particles to be thrown back into the tank, allowing only clean water to enter the guide port 10.

[0029] Reference Figure 6 The tank 21 is equipped with a cleaning component 6, which is used to clean the upper surface of the collection cover 4. The cleaning assembly 6 includes a rotating ring 61, multiple guide plates 62, and multiple cleaning strips 63. A rotating groove is provided on the inner side of the tank body 21. The rotating ring 61 is rotatably disposed inside the rotating groove. Multiple guide plates 62 are fixedly connected in a ring to the inner side of the rotating ring 61 to form a guide wheel. Multiple cleaning strips 63 are fixedly connected below the guide plates 62 and contact the upper surface of the collection cover 4. As sediment is collected and accumulated on the surface of the collection hood 4, the sludge will adhere and clump together. Since the adhesion force of the accumulation is much greater than the gravity, the sludge cannot be discharged by gravity. Manual cleaning is difficult, and the sediment cover can easily lead to sludge discharge failure.

[0030] The reaction spiral blade 32 rotates, causing the water flow to rotate. The water flow impacts the guide plate 62, causing the rotating ring 61 to rotate. There is no motor and no energy consumption in the whole process.

[0031] During rotation, the multiple guide plates 62 drive the cleaning strips 63 to rotate. Since the cleaning strips 63 are in contact with the surface of the collection hood 4, the rotation of the cleaning strips 63 generates shearing and scraping force, which destroys the sludge adhesion structure. Moreover, the guide plates 62 rotate at a relatively slow speed, and the cleaning strips 63 gently scrape off the accumulated sediment without disturbing the reaction zone. The cleaning strips 63 move the scraped sediment to the guide outlet, thereby ensuring the discharge and collection of the sediment.

[0032] Reference Figure 3 and Figure 4 The upper side of the treatment tank 2 is provided with a material guiding device 7, which is used to introduce a treatment agent into the treatment tank 2. The treatment agent can be nutrients, flocculants and pH adjusters. The material guiding device 7 includes a material guiding tank 71, a connecting module 72, and multiple spray holes 73. The material guiding tank 71 is fixedly connected to the upper end of the processing tank 2. The connecting module 72 is rotatably connected between the material guiding tank 71 and the drive module 33. A material guiding channel is opened in the middle of the drive rod 31, and the material guiding tank 71 is connected to the material guiding channel through a connecting pipe. The multiple spray holes 73 are symmetrically arranged on both sides of the drive rod 31 and are connected to the material guiding channel. During the reaction between wastewater and algae biofilm, treatment agents need to be added to improve reaction efficiency. If the local concentration of the treatment agent is too high or too low during the introduction process, it will inhibit the growth of algae and bacteria, resulting in insufficient nutrition for algae and bacteria. At the same time, uneven addition will lead to the collapse of the symbiotic system. During the addition of the treatment agent, the treatment agent inside the feed tank 71 is introduced into the feed channel. The center of the drive rod 31 rotates, and the treatment agent is thrown to all sides by centrifugal force. Since the treatment agent rotates synchronously with the reaction component 3, the addition is synchronized with the turbulence, and the mixture is uniform in an instant with a very short mixing time, ensuring the uniform addition of the treatment agent.

[0033] Reference Figure 4 and Figure 8 The bottom of the treatment tank 2 is provided with a backflushing device 8, which includes a cleaning pipe 81 and a connecting pump 82. The cleaning pipe 81 is an annular pipe and is located below the collection hood 4. The output end of the connecting pump 82 is connected to the cleaning pipe 81. During the long-term wastewater treatment process in the reactor, the biofilm will age, the sediment will clog the reaction pores, and scale will form inside. If the reactor is shut down for cleaning, it will affect continuous operation and reduce the wastewater treatment speed.

[0034] The annular cleaning pipe 81 enables the upward spraying of water in an annular pattern, forming a backwashing flow field that covers the entire area inside the treatment tank 2. At the same time, the high-pressure water flow during backwashing generates impact shearing force, which peels off the scale and aged biofilm. Simultaneously, the high-pressure water flow also impacts the area below the collection hood 4, causing the collection hood 4 to move upward, thereby keeping the collection component 5 in a sealed state, maintaining pressure during cleaning, and preventing pressure leakage.

[0035] Reference Figure 7 The sealing ring 51 is configured as a variable diameter ring with a larger bottom and a smaller top, and the guide ring 52 is made of elastic material with an inclined side for sealing the variable diameter part of the contact sealing ring 51.

[0036] The sealing ring 51 is a conical surface with a smaller upper part and a larger lower part, forming a sealing guide position, while the guide ring 52 is made of elastic material and has an inclined sealing edge on the side. During the upward movement, it fits and seals with the sealing ring 51 on the conical surface, and the sealing surface becomes tighter as the pressure increases. During the wastewater treatment process, the movable rod 53 moves downward, the sealing surface separates, forming an annular guide gap, and the sludge falls into the collection box 54 along the conical surface. When the inside of the treatment tank 2 is backwashed, the movable rod 53 moves upward under the impact of the water flow. The movable rod 53 drives the guide ring 52 to move upward. The inclined edge of the elastic guide ring 52 fits tightly with the diameter change of the sealing ring 51 to form a forced seal, so that the elastic edge bites with the conical surface and seals instantly. There is no stagnation or jamming in the whole process.

[0037] The variable diameter sealing ring 51 and the guide ring 52 have elastic inclined edges to form an adaptive surface seal. The seal can automatically switch between three working conditions: sediment collection, wastewater reaction treatment and backwashing, without manual intervention. The sealing reliability is far higher than that of traditional flange and gasket seals.

[0038] Working principle: Wastewater enters tank 21 through inlet pipe 23. A medium is introduced into the constant temperature space to maintain a stable reaction temperature. Drive module 33 drives reaction spiral blade 32 to rotate, ensuring full contact between wastewater and the biological reaction layer. The algae-bacteria symbiotic system degrades pollutants. Treatment agent in feed tank 71 is evenly sprayed through feed channel and spray nozzle 73 as it rotates. After treatment, water enters discharge space through guide port 10 and is discharged through outlet pipe 24. Sediment is retained at the bottom of tank 21. Water flow drives guide plate 62 to rotate, and cleaning strip 63 scrapes off sediment on the surface of collection hood 4. During the reaction, movable rod 53 drives guide ring 52 to move down, opening the sealing gap, and sediment falls into collection box 54. After collection, guide ring 52 moves up and seals tightly with sealing ring 51. After wastewater treatment is completed, pump 82 is started, and high-pressure water is sprayed upward from cleaning pipe 81 to flush collection hood 4 and reaction component 3. At this time, collection component 5 is in a sealed state to prevent backwash water leakage. After flushing, sediment is discharged with the collection process.

[0039] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A wastewater treatment apparatus based on algal-bacterial symbiotic photobioreactor, comprising: The mounting frame and the processing tank fixed inside the mounting frame are characterized in that a reaction assembly is provided inside the processing tank. The reaction assembly includes a drive rod and a reaction spiral blade. The drive rod is vertically arranged inside the processing tank. The reaction spiral blade is sleeved on the drive rod. The reaction spiral blade has a reaction hole and a biological reaction layer is provided inside. The bottom of the processing tank is provided with a collection cover, which is in the shape of an inverted frustum. The collection hood has two symmetrical outlets at its bottom. A collection assembly is provided below the collection hood. The collection assembly includes a sealing ring, a guide ring, a movable rod, and a collection box. The sealing ring is fixedly connected to the bottom side of the collection hood. The movable rod is fixedly connected to the bottom side of the middle part of the collection hood. The guide ring is fixedly connected to the middle part of the movable rod. The collection box is fixedly connected to the bottom end of the movable rod. The movable rod is used to drive the guide ring to move up and down and to control the opening and closing of the gap between the sealing ring and the guide ring.

2. The apparatus for wastewater treatment based on the algal-bacterial symbiosis photobioreactor according to claim 1, characterized in that, The treatment tank includes a tank body, an isolation cover, an inlet pipe, and an outlet pipe. The isolation cover is fixedly fitted on the outside of the tank body, and a constant temperature space is formed between the isolation cover and the tank body. The inlet pipe is fixedly connected to the upper side of the tank body and the isolation cover, and the outlet pipe is fixedly connected to the lower side of the tank body.

3. The apparatus for wastewater treatment based on the algal-bacterial symbiosis photobioreactor according to claim 2, characterized in that, The reaction assembly also includes a drive module and a sealing plate. The sealing plate is fixedly connected to the upper part of the inside of the processing tank. The drive module is fixedly installed between the sealing plate and the top wall of the tank. The drive rod is fixedly connected to the drive end of the drive module.

4. The apparatus for wastewater treatment based on the algal-bacterial symbiosis photobioreactor according to claim 2, characterized in that, Two partitions are fixedly connected between the tank body and the isolation cover, and the space between the two partitions is the outlet space. Multiple guide ports are circumferentially opened on the bottom side of the tank body. The guide ports are located on the side of the outlet space. The side of the guide port closer to the reaction spiral blade is larger than the other side, and the guide ports are inclined.

5. The apparatus for wastewater treatment based on the algal-bacterial symbiosis photobioreactor according to claim 2, characterized in that, The tank is equipped with a cleaning component, which is used to clean the upper surface of the collection hood.

6. The apparatus for wastewater treatment based on the photobioreactor of algae-bacteria symbiosis according to claim 5, characterized in that, The cleaning assembly includes a rotating ring, multiple guide plates, and multiple cleaning strips. A rotating groove is provided on the inner side of the tank. The rotating ring is rotatably disposed inside the rotating groove. Multiple guide plates are fixedly connected in a ring shape to the inner side of the rotating ring to form a guide wheel. Multiple cleaning strips are fixedly connected below the guide plates and are in contact with the upper surface of the collection hood.

7. A wastewater treatment device based on an algae-bacteria symbiotic photobioreactor according to claim 2, characterized in that, A material guiding device is provided on the upper side of the treatment tank, which is used to introduce the treatment agent into the treatment tank.

8. A wastewater treatment device based on an algae-bacteria symbiotic photobioreactor according to claim 7, characterized in that, The material guiding device includes a material guiding tank, a connecting module, and multiple spray holes. The material guiding tank is fixedly connected to the upper end of the processing tank. The connecting module is rotatably connected between the material guiding tank and the drive module. A material guiding channel is opened in the middle of the drive rod, and the material guiding tank is connected to the material guiding channel through a connecting pipe. The multiple spray holes are symmetrically arranged on both sides of the drive rod and are connected to the material guiding channel.

9. A wastewater treatment device based on an algae-bacteria symbiotic photobioreactor according to claim 1, characterized in that, The bottom of the treatment tank is equipped with a backflushing device, which includes a cleaning pipe and a connecting pump. The cleaning pipe is an annular pipe and is located below the collection hood. The output end of the connecting pump is connected to the cleaning pipe.

10. A wastewater treatment device based on an algae-bacteria symbiotic photobioreactor according to claim 1, characterized in that, The sealing ring is configured as a variable diameter ring with a larger diameter at the bottom and a smaller diameter at the top. The guide ring is made of elastic material and has an inclined side for sealing the variable diameter part that contacts the sealing ring.

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