Bacteria-algae symbiotic bio-membrane reactor for sewage treatment

Abstract

The utility model provides an algal-bacterial symbiotic bio-membrane reactor for sewage treatment, which comprises a reactor body, the reactor body comprises a tank body, a reaction cavity is formed in the tank body, suspended filler is arranged in the reaction cavity, the suspended filler is scattered in the reaction cavity, a rotating shaft is arranged in the tank body in a penetrating manner, and the rotating shaft is connected with the tank body. One end of the rotating shaft extends into the reaction cavity, and a biological rotating disc and a vortex assembly are arranged at the end, located in the reaction cavity, of the rotating shaft; the vortex assembly comprises an impeller and an impeller ridge arranged on the impeller, and the rotating shaft is sleeved with the impeller. The sewage treatment device has the advantages of high sewage treatment efficiency and low energy loss.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sewage treatment, especially to a sewage treatment bacteria-algae symbiotic biofilm reactor. BACKGROUND

[0002] Bacteria-algae symbiosis is an important ecological phenomenon, which refers to the growth of bacteria and algae together, and mutual dependence and mutual influence, forming a stable ecological system.

[0003] In recent years, bacteria-algae symbiosis technology plays an increasingly important role in the field of sewage treatment. Specifically, bacteria-algae symbiosis technology decomposes organic matter by bacteria to convert into simple nutrients available to algae, and algae release oxygen through photosynthesis to improve water dissolved oxygen and promote bacterial metabolism. This process reduces the accumulation of undegraded substances, realizes the transformation and nutrient cycling of organic matter, ensures the efficient and continuous operation of the system, and improves the decontamination efficiency. In addition, the formation of biofilm by bacteria-algae symbiosis is beneficial to providing a stable growth environment for microorganisms, enhancing their metabolic activity and contact opportunity with pollutants, thereby accelerating the removal of pollutants.

[0004] In order to facilitate the treatment of sewage, technicians have developed related reactors, for example, the invention disclosed in CN116102175A relates to a floating filler type bacteria-algae symbiotic sewage treatment device, which comprises a reaction tank, a support frame arranged at the top of the reaction tank, and a braided fiber filler bundled with the support frame. The side wall of the reaction tank is connected with a water distribution pipe and a drainage pipe, the water distribution pipe is connected with a water supply flow pump, and the drainage pipe is connected with a emptying pump. During use, the water supply flow pump is controlled to pump the sewage to be treated into the reaction tank, and the sewage liquid level covers the braided fiber filler, so that the braided fiber filler is semi-fixedly floated on the sewage surface. The braided fiber filler floating on the sewage surface provides a habitat for nitrifying bacteria, denitrifying bacteria and microalgae to attach and reproduce, and through the growth and metabolism of microorganisms, sewage treatment is carried out. After completing a reaction cycle, the treated domestic sewage is discharged through the emptying pump.

[0005] However, the contact degree of sewage with bacteria and algae is limited in the reactor of the prior art, and the growth and metabolism of microorganisms are not sufficient and uniform, thereby reducing the efficiency of sewage treatment. UTILITY MODEL CONTENT

[0006] In order to improve the problem of low efficiency of existing sewage treatment, the utility model provides a bacteria-algae symbiotic biofilm reactor for efficient sewage treatment.

[0007] The bacteria-algae symbiotic biofilm reactor for sewage treatment provided by the utility model adopts the following technical scheme:

[0008] The sewage treatment bacteria-algae symbiotic biofilm reactor comprises a reactor body, the reactor body comprises a tank body, the tank body is formed with a reaction cavity, the reaction cavity is provided with suspended fillers, the suspended fillers are scattered in the reaction cavity, the tank body is provided with a rotating shaft, one end of the rotating shaft extends into the reaction cavity, and the end of the rotating shaft in the reaction cavity is provided with a biological rotating disc and a vortex assembly; the vortex assembly comprises an impeller and a wheel ridge arranged on the impeller, and the impeller is sleeved on the rotating shaft.

[0009] Through the above technical scheme, before sewage treatment, the activated sludge is added and operated for a period of time, so that the suspended fillers and the biological rotating disc are preliminarily biofilm, and then the microalgae is added and operated for a period of time to carry out secondary biofilm, so that the biological membrane is formed on the suspended fillers and the biological rotating disc. The biological membrane is beneficial to resist extreme environment (such as dryness, extreme pH value and temperature) and buffer toxic substance invasion, thereby being beneficial to provide a stable growth environment for microorganisms, enhance their metabolic activity and contact opportunity with pollutants.

[0010] During sewage treatment, the sewage is introduced into the reaction cavity to contact and react with the biological membrane. The rotating shaft is driven to rotate to drive the biological rotating disc and the impeller to rotate. The impeller and the wheel ridge make the liquid in the reaction cavity form a vortex quickly. Light is provided to make the bacteria-algae fully contact with organic matter and nutrients in the sewage, so that the algae grow through sufficient photosynthesis and utilize carbon dioxide or inorganic carbon source to produce sufficient oxygen, so that the aerobic bacteria degrade the organic matter, the metabolic products of the aerobic bacteria are assimilated by the algae, and the pollutants in the sewage are removed through the bacteria-algae symbiosis.

[0011] In summary, the rotation of the biological rotating disc is beneficial to increase the contact between the sewage and the fixed fillers, thereby accelerating the metabolism of microorganisms. The rotation process is also beneficial to make the biological membrane on the biological rotating disc better fall off and renew, and enhance the stability of the biological membrane structure. The vortex formed in the reaction cavity can effectively enhance the flowability of the water body, so that the biological membrane and the sewage are more uniformly and fully contacted, thereby improving the sewage treatment efficiency. Through sufficient contact, the organic matter is effectively converted and the nutrients are decomposed, the accumulation of undegraded substances is reduced, the sludge generation caused by excess nutrients is reduced, and the oxygen solubility in water is also improved, thereby promoting the activity of aerobic microorganisms.

[0012] Preferably, the reactor body further comprises support legs, and the support legs are arranged at the bottom end of the tank body.

[0013] Through the above technical scheme, the tank body is stably supported by the four support legs.

[0014] Preferably, the reaction cavity is a cylindrical cavity, and the rotating shaft is in the same straight line with the central axis of the reaction cavity.

[0015] Through the technical scheme, the shape of the reaction cavity is beneficial to the generation of vortex and the reduction of dead flow in combination with the fluid dynamics characteristics

[0016] Preferably, the biological rotating disc comprises a filler support sleeved on the rotating shaft and fixed fillers serving as carriers of the bacterial and algal biofilm, and the fixed fillers are arranged on the filler support.

[0017] Through the technical scheme, the filler support is used to support the fixed fillers, so that sufficient biofilm is ensured in combination with the fixed fillers and the suspended fillers.

[0018] Preferably, the fixed fillers are biological rope fillers, the fixed fillers are fixed on the filler support in a winding manner, and the suspended fillers are polyurethane fillers.

[0019] Through the technical scheme, the biological rope fillers provide abundant attachment surfaces, which are beneficial to providing a stable habitat for microorganisms, so as to promote the growth of bacteria and algae and effectively promote the formation of biofilm.

[0020] The polyurethane fillers have a porous structure, which helps to provide a larger specific surface area and effectively promote gas exchange. Meanwhile, the lightweight characteristics of the polyurethane fillers enable them to maintain good suspensibility in water, avoid sedimentation, and ensure uniform distribution of bacteria and algae.

[0021] Preferably, the wheel ridges are smooth slide-shaped on the side away from the impeller, the thickness of the wheel ridges gradually decreases from the center to the edge of the impeller, and a plurality of wheel ridges are arranged at equal intervals along the circumferential direction of the impeller.

[0022] Through the technical scheme, the shape of the wheel ridges is beneficial to improving the effect of forming vortex in the reaction cavity, the plurality of wheel ridges are arranged at equal intervals along the circumferential direction of the impeller, can uniformly apply disturbance on the surface of the impeller, and the existence of the plurality of wheel ridges strengthens the overall formation of vortex.

[0023] Preferably, the groove body is provided with a driving motor for driving the rotating shaft to rotate, and the driving end of the driving motor is connected with the end of the rotating shaft extending out of the groove body.

[0024] Through the technical scheme, the rotating shaft can be driven to rotate by the driving motor, the impeller and the biological rotating disc are driven to rotate synchronously, and the coaxial arrangement of the impeller and the biological rotating disc is beneficial to reducing the driving source and reducing energy consumption.

[0025] Preferably, the groove body is further provided with a light emitting member, the light emitting part of the light emitting member faces the reaction cavity, and a plurality of light emitting members are arranged at equal intervals along the circumferential direction of the reaction cavity.

[0026] Through the technical scheme, the light emitting member provides suitable light conditions for photosynthesis of algae, and the multiple light emitting members are beneficial to provide uniform light distribution and reduce light dead angles.

[0027] Preferably, the light emitting member is an LED light bar, and the light intensity of the light emitting member is 3000 lux to 10000 lux.

[0028] Through the technical scheme, the light intensity range effectively supports photosynthesis of algae and is beneficial to promote growth of algae and bacteria.

[0029] Preferably, the reactor body is provided with a water inlet pipe and a water outlet pipe, the water inlet pipe is provided with a first filter screen, the water outlet pipe is provided with a second filter screen, and the mesh of the first filter screen and the second filter screen is smaller than the minimum cross-sectional area of the suspended filler.

[0030] Through the technical scheme, when sewage is treated, the first filter screen and the second filter screen are beneficial to prevent the suspended filler from being lost.

[0031] Compared with the prior art, the utility model includes the following beneficial effects:

[0032] By forming the vortex in the reaction cavity, the flowability of the water body can be effectively enhanced, the biofilm and the sewage can be more uniformly and sufficiently contacted, and thus the sewage treatment efficiency is improved.

[0033] The impeller and the biological turntable are coaxially arranged, which is beneficial to reduce the driving source and reduce energy loss.

[0034] The arrangement of the multiple light emitting members, the distribution of the light emitting members and the light direction make the light receiving in the reaction cavity more uniform, improve the efficiency of photosynthesis, and facilitate healthy growth and reproduction of algae.

[0035] The shape of the wheel ridge is beneficial to improve the effect of forming the vortex in the reaction cavity, the multiple wheel ridges are equidistantly distributed along the circumferential direction of the impeller, can uniformly apply disturbance on the surface of the impeller, and the existence of the multiple wheel ridges strengthens the overall formation of the vortex. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings described in the following are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the premise of not paying creative effort.

[0037] Figure 1 It is the overall structure schematic view of the embodiment of the present application.

[0038] Figure 2 It is the sectional view of the reactor body in the embodiment of the present application.

[0039] Figure 3 It is the front view of the internal structure of the reactor body in the embodiment of the present application.

[0040] Among them, the part number explanation is: 1, reactor body; 11, tank body; 12, support leg; 2, reaction cavity; 3, suspended filler; 4, rotating shaft; 5, biological rotating disc; 51, filler support; 52, fixed filler; 6, vortex assembly; 61, impeller; 62, wheel ridge; 7, driving motor; 8, light emitting part; 9, water inlet pipe; 10, water outlet pipe; 13, wheel groove; 14, first filter screen; 15, second filter screen. DETAILED DESCRIPTION

[0041] The following will combine the drawings in the embodiment of the present application Figures 1 to 3 , to clearly and completely describe the technical scheme in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort belong to the scope of protection of the present application.

[0042] A kind of sewage treatment's bacteria-algae symbiotic biofilm reactor, refer to Figure 1 , including reactor body 1, water inlet pipe 9 and water outlet pipe 10 arranged in reactor body 1. Among them, reactor body 1 includes tank body 11 and support leg 12 for supporting tank body 11. Tank body 11 is rectangular, and tank body 11 is distributed along the vertical direction. Tank body 11 is formed with reaction cavity 2, and the section of reaction cavity 2 is circular, and reaction cavity 2 is distributed along the length direction of tank body 11, that is, reaction cavity 2 is cylindrical cavity. Support leg 12 is arranged at the bottom end of tank body 11, and four support legs 12 are arranged, and four support legs 12 are respectively close to the four corners of tank body 11, so that tank body 11 is stably supported by four support legs 12.

[0043] Refer to Figure 1 and Figure 2One end of the water inlet pipe 9 is connected with the groove body 11, and the water inlet pipe 9 is communicated with the reaction cavity 2. The water inlet pipe 9 is close to the top side of the reaction cavity 2, and the water inlet pipe 9 far away from the end of the groove body 11 is connected with the sewage source, so that the sewage is guided into the reaction cavity 2 through the water inlet pipe 9. One end of the water outlet pipe 10 is also connected with the groove body 11, and the water outlet pipe 10 is communicated with the reaction cavity 2. The water outlet pipe 10 is close to the bottom side of the reaction cavity 2, so that the water after sewage treatment is conveniently discharged.

[0044] With reference to Figure 3 The reaction cavity 2 is provided with a suspended filler 3 serving as a carrier of the bacteria-algae biofilm, and the suspended filler 3 is scattered in the reaction cavity 2. In this embodiment, the suspended filler 3 is a polyurethane filler, and the filling ratio of the suspended filler 3 is 10% to 20%. The polyurethane filler has a porous structure, which helps to provide a larger specific surface area and effectively promote gas exchange. At the same time, the lightweight characteristics of the polyurethane filler enable it to maintain good suspensibility in water, avoid sedimentation, and ensure uniform distribution of bacteria and algae. The filling ratio of the suspended filler 3 is 10% to 20%, which ensures uniform distribution of bacteria and algae on the surface of the filler, avoids overcrowding, promotes better photosynthesis and nutrient absorption, and also helps to maintain the flowability of the water body and avoid blockage between the fillers.

[0045] In addition, with reference to Figure 2 And Figure 3 The bottom end of the groove body 11 is provided with a rotating shaft 4, which is distributed along the length direction of the groove body 11. One end of the rotating shaft 4 is located in the reaction cavity 2, and the other end of the rotating shaft 4 extends out of the bottom end of the groove body 11. The rotating shaft 4 is in the same straight line with the central axis of the reaction cavity 2. The one end of the rotating shaft 4 located in the reaction cavity 2 is provided with a biological rotating disc 5.

[0046] Specifically, with reference to Figure 2 And Figure 3 The biological rotating disc 5 includes a filler support 51 sleeved on the rotating shaft 4 and a fixed filler 52 serving as a carrier of the bacteria-algae biofilm. The filler support 51 is disc-shaped, and is sleeved on the one end of the rotating shaft 4 located in the reaction cavity 2. The filler support 51 is in the same straight line with the central axis of the rotating shaft 4, and the fixed filler 52 is arranged on the filler support 51. In this embodiment, the fixed filler 52 is a biological rope filler, and is fixed on the filler support 51 by winding. The biological rope filler provides a rich attachment surface, which is conducive to providing a stable habitat for microorganisms, facilitating the growth of bacteria and algae, and effectively promoting the formation of biofilm.

[0047] With reference to Figure 2 And Figure 3The three biological rotating discs 5 are consistent and are arranged at equal intervals along the length direction of the rotating shaft 4, so as to ensure the amount of the fixed filler 52 and increase the contact area. The fixed filler 52 and the suspended filler 3 are beneficial to ensure sufficient amount of biofilm.

[0048] Before the sewage treatment, the activated sludge is added and runs for a period of time, so as to carry out preliminary biofilm formation on the suspended filler 3 and the fixed filler 52, and then the microalgae is added and runs for a period of time to carry out secondary biofilm formation, so as to form the biofilm on the suspended filler 3 and the fixed filler 52. The biofilm is beneficial to resist extreme environment (such as dryness, extreme pH value and temperature) and buffer the invasion of toxic substances, so as to provide a stable growth environment for the microorganisms and enhance their metabolic activity and contact opportunity with the pollutants. In the embodiment, the initial concentration of the added activated sludge is 3000-5000 mg / L, the microalgae is Chlorella, and the mass ratio of the added microalgae and activated sludge is 1:5. In addition, the rotating shaft 4 is driven to rotate, so as to drive the biological rotating disc 5 to rotate, which is beneficial to increase the contact between the sewage and the fixed filler 52, so as to accelerate the metabolism of the microorganisms. The rotation process is also beneficial to make the biofilm on the biological rotating disc 5 better fall off and renew, and enhance the structural stability of the biofilm.

[0049] Referring to Figure 2 With Figure 3 , one end of the rotating shaft 4 located in the reaction cavity 2 is also provided with a vortex assembly 6, which is used to generate vortex in the reaction cavity 2. During the sewage treatment, the sewage is introduced into the reaction cavity 2 from the water inlet pipe 9 to contact and react with the biofilm. The vortex assembly 6 is driven to rotate by driving the rotating shaft 4 to rotate, so as to form vortex in the reaction cavity 2. Through appropriate illumination, the bacteria and algae are fully contacted with the organic matter and nutrients in the sewage, so that the algae grow through sufficient photosynthesis and utilize carbon dioxide or inorganic carbon source to produce sufficient oxygen, so as to degrade the organic matter by the aerobic bacteria, and the metabolic products (such as inorganic nitrogen and phosphorus) of the aerobic bacteria are assimilated by the algae, so as to remove the pollutants in the sewage through the bacteria-algae symbiosis, and then the treated sewage is discharged through the water outlet pipe 10.

[0050] Specifically, referring to Figure 2 With Figure 3The vortex assembly 6 includes a hemispherical impeller 61 and a ridge 62 disposed on the impeller 61. A groove 13 is formed at the bottom of the reaction chamber 2, and the impeller 61 is located within the groove. The groove 13 is adapted to the spherical side of the impeller 61, and the planar side of the impeller 61 is on the same plane as the bottom of the reaction chamber 2, allowing the impeller 61 to rotate within the groove. The impeller 61 is mounted on the rotating shaft 4, so that when the rotating shaft 4 rotates, the impeller 61 rotates synchronously. The ridge 62 is disposed on the planar side of the impeller 61. The side of the ridge 62 facing away from the impeller 61 has a smooth, slide-like surface. The thickness of the ridge 62 gradually decreases from the center of the impeller 61 to the edge. The shape of the ridge 62 helps to reduce flow resistance and improve the effect of forming vortices within the reaction chamber 2.

[0051] Continue to refer to Figure 2 and Figure 3 Multiple ridges 62 are provided, and the multiple ridges 62 are evenly distributed along the circumferential direction of the impeller 61. The multiple ridges 62 can uniformly apply disturbances to the surface of the impeller 61, and the presence of multiple ridges 62 enhances the overall formation of vortices. In this embodiment, there are four ridges 62, which are evenly distributed along the circumferential direction of the impeller 61, so that the four ridges 62 are distributed in a cross shape.

[0052] During wastewater treatment, the rotating shaft 4 drives the impeller 61 and its ridge 62 to rotate, creating a vortex in the reaction chamber 2. This causes the liquid within the reaction chamber 2 to rotate and tumble. Combined with fluid dynamics characteristics, the shape of the reaction chamber 2 also promotes vortex generation and reduces dead zones. The vortex formation within the reaction chamber 2 effectively enhances water flow, allowing for more uniform and thorough contact between the biofilm and wastewater, thus increasing wastewater treatment efficiency. This thorough contact effectively converts organic matter and decomposes nutrients, reducing the accumulation of undegraded substances and minimizing sludge formation caused by excess nutrients. It also improves oxygen solubility in the water, promoting the activity of aerobic microorganisms. The impeller 61, located at the bottom of the reaction chamber 2, effectively reduces sedimentation and accumulation at the bottom of the chamber.

[0053] Reference Figure 2 and Figure 3 The tank 11 is equipped with a drive motor 7 that drives the rotating rod to rotate. The drive end of the drive motor 7 is connected to one end of the rotating shaft 4 that extends out of the tank 11. Thus, the drive motor 7 can drive the rotating shaft 4 to rotate, which in turn drives the impeller 61 and the biological rotating plate 5 to rotate synchronously. Furthermore, the coaxial arrangement of the impeller 61 and the biological rotating plate 5 helps to reduce the drive source and reduce energy consumption.

[0054] In addition, refer to Figure 1 and Figure 2In order to provide suitable light conditions for photosynthesis of algae, the light emitting member 8 is arranged in the tank 11. The light emitting member 8 is a LED light bar. The light emitting member 8 is long strip-shaped and is distributed along the length direction of the tank 11. The light emitting part of the light emitting member 8 faces the reaction cavity 2, so that the light emitting member 8 penetrates the whole depth of the tank 11, and the light in the reaction cavity 2 is uniformly distributed. A plurality of light emitting members 8 are arranged. The plurality of light emitting members 8 are distributed at equal intervals along the circumferential direction of the reaction cavity 2. In the embodiment, four light emitting members 8 are arranged. The four light emitting members 8 are beneficial to provide uniform light distribution and reduce light dead angle. The light intensity of the light emitting member 8 is 3000 lux to 10000 lux. This light intensity range effectively supports photosynthesis of algae and is beneficial to promote growth of algae. In combination with the vortex in the reaction cavity 2, the algae can more uniformly obtain light, so that the algae can fully perform photosynthesis and generate sufficient oxygen, so as to provide oxygen for aerobic bacteria, and prevent insufficient oxygen generated due to uneven distribution of algae or uneven light. In addition, if sunlight is sufficient, the light emitting member is not needed.

[0055] The first filter screen 14 is arranged at the water inlet pipe 9, and the second filter screen 15 is arranged at the water outlet pipe 10. The mesh of the first filter screen 14 and the mesh of the second filter screen 15 are both smaller than the minimum cross-sectional area of the suspended filler 3, so that the suspended filler 3 is prevented from flowing out through the first filter screen 14 and the second filter screen 15.

[0056] The implementation principle of the present application is as follows. Before sewage treatment, active sludge is added and operated for a period of time, so that the suspended filler 3 and the fixed filler 52 are preliminarily biofilm-covered. Then, microalgae are added and operated for a period of time for secondary biofilm covering, so that a biofilm is formed on the suspended filler 3 and the fixed filler 52. The biofilm is beneficial to resist extreme environment (such as dryness, extreme pH value and temperature) and buffer toxic substance invasion, so as to provide a stable growth environment for microorganisms and enhance their metabolic activity and contact opportunity with pollutants.

[0057] During sewage treatment, sewage is introduced into the reaction cavity 2 from the water inlet pipe 9 to contact and react with the biofilm. The rotation of the driving shaft 4 drives the biological turntable 5 and the impeller 61 to rotate. The impeller 61 and the wheel ridge 62 make the liquid in the reaction cavity 2 form a vortex. At the same time, the light emitting member 8 provides uniform light conditions, so that the bacteria and algae fully contact with organic matter and nutrients in the sewage. The algae grow through sufficient photosynthesis and use of carbon dioxide or inorganic carbon source to generate sufficient oxygen, so that the aerobic bacteria degrade the organic matter, and the metabolic products of the aerobic bacteria are assimilated by the algae. Thus, the pollutants in the sewage are removed through the bacteria-algae symbiotic mode. After completion, the sewage is discharged through the water outlet pipe 10.

[0058] In summary, by rotating the biological turntable 5, it is beneficial to increase the contact between the sewage and the fixed filler 52, thereby accelerating the metabolism of microorganisms, and the rotation process is also beneficial to better shedding and updating of the biofilm on the biological turntable 5, and to enhance the stability of the biofilm structure. By forming a vortex in the reaction cavity 2, the flowability of the water body can be effectively enhanced, the biofilm and the sewage can be more uniformly and fully contacted, thereby improving the sewage treatment efficiency, effectively converting organic matter and decomposing nutrients through sufficient contact, reducing the accumulation of undegraded substances, reducing the sludge generated by excess nutrients, and also being beneficial to improving the oxygen solubility in water, promoting the activity of aerobic microorganisms.

[0059] The above merely describes the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A bacteria-algae symbiotic biofilm reactor for sewage treatment comprising a reactor body (1), characterized in that: The reactor body (1) comprises a tank body (11) formed with a reaction cavity (2), wherein a suspended filler (3) is arranged in the reaction cavity (2), the tank body (11) is provided with a rotating shaft (4), one end of the rotating shaft (4) extends into the reaction cavity (2), and the end of the rotating shaft (4) in the reaction cavity (2) is provided with a biological rotating disc (5) and a vortex assembly (6); the vortex assembly (6) comprises an impeller (61) and a wheel ridge (62) arranged on the impeller (61), and the impeller (61) is sleeved on the rotating shaft (4).

2. A wastewater treatment bacteria-algae symbiotic biofilm reactor according to claim 1, characterized in that: The reactor body (1) further comprises a supporting leg (12) arranged at the bottom end of the tank body (11).

3. The bacteria-algae symbiotic biofilm reactor for wastewater treatment according to claim 1, characterized in that: The reaction cavity (2) is a cylindrical cavity, and the rotating shaft (4) is in the same straight line with the central axis of the reaction cavity (2).

4. The bacteria-algae symbiotic biofilm reactor for wastewater treatment according to claim 1, characterized in that: The biological rotating disc (5) comprises a filler support (51) sleeved on the rotating shaft (4) and a fixed filler (52) serving as a carrier of a bacterial algal biofilm, and the fixed filler (52) is arranged on the filler support (51).

5. A wastewater treatment bacteria-algae symbiotic biofilm reactor according to claim 4, characterized in that: The fixed filler (52) is a biological rope filler, and the fixed filler (52) is fixed on the filler support (51) in a winding manner; and the suspended filler (3) is a polyurethane filler.

6. The wastewater treatment bacteria-algae symbiosis biofilm reactor according to claim 1, characterized in that: The wheel ridge (62) is smooth and in the shape of a slide on the side away from the impeller (61), the thickness of the wheel ridge (62) gradually decreases from the center to the edge of the impeller (61), and a plurality of wheel ridges (62) are arranged at equal intervals along the circumferential direction of the impeller (61).

7. The wastewater treatment bacteria-algae symbiosis biofilm reactor according to claim 1, characterized in that: A driving motor (7) for driving the rotating shaft to rotate is arranged on the tank body (11), and the driving end of the driving motor (7) is connected to one end of the rotating shaft (4) extending out of the tank body (11).

8. The wastewater treatment bacteria-algae symbiosis biofilm reactor according to claim 1, characterized in that: A light emitting member (8) is further arranged in the tank body (11), the light emitting part of the light emitting member (8) faces the reaction cavity (2), and a plurality of light emitting members (8) are arranged at equal intervals along the circumferential direction of the reaction cavity (2).

9. A wastewater treatment bacteria-algae symbiotic biofilm reactor according to claim 8, characterized in that: The light emitting member (8) is an LED lamp rod, and the illumination intensity of the light emitting member (8) is 3000 lux to 10000 lux.

10. The wastewater treatment bacteria-algae symbiosis biofilm reactor according to claim 1, characterized in that: The reactor body (1) is provided with a water inlet pipe (9) and a water outlet pipe (10), the water inlet pipe (9) is provided with a first filter screen (14), the water outlet pipe (10) is provided with a second filter screen (15), and the mesh of the first filter screen (14) and the second filter screen (15) is smaller than the minimum cross-sectional area of the suspended filler (3).

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