Microplastic biodegradation coupling photocatalysis treatment device

Abstract

The utility model relates to the field of environmental protection, and discloses a microplastic biodegradation coupling photocatalysis treatment device which comprises a first pipeline, a photocatalysis system, a second pipeline, a biodegradation tower, a third pipeline, an algae treatment system, a fourth pipeline and a liquid storage tank, the biodegradation tower is provided with a filtering assembly and suspended filler, and algae are arranged in the algae treatment system. The device has the beneficial effects that the degradation and removal of micro-plastics can be synergistically promoted through the three treatment systems which are connected in series, the device has the advantages of high reaction efficiency, mild reaction conditions, low environmental load and environmental protection, the whole device is simple, reasonable in design and strong in operability, the degradation efficiency is improved through the multi-stage degradation device, and the cost is reduced. The environmental pollution is reduced, and the application prospect is wide.

Description

Technical Field

[0001] The utility model relates to the field of environmental protection, in particular to a microplastic biodegradation coupled photocatalytic treatment device. Background Art

[0002] Plastic products are ubiquitous in modern society. To date, humans have produced more than 8 billion tons of plastic, of which up to 79% are landfilled or discarded in nature. Today, there is a consensus on the harm of plastics to the environment and health, but smaller microplastics (<5mm) have only attracted people's attention in recent years. They have a wide range of sources, huge quantities, great harm and are more hidden. Studies have shown that the presence of microplastics has been detected in human blood, gastrointestinal tract, lung, liver, spleen and kidney tissue samples; in plants, it has also been found that the accumulation of nanoplastics will inhibit plant growth and seedling development, directly affecting agricultural sustainable development and food safety.

[0003] At present, most of the research on microplastics focuses on the collection and separation of microplastics, as well as the impact on the natural environment and human health, and less on the treatment of microplastic pollution. Microplastics in water bodies account for the largest proportion in the natural environment. The current treatment methods mainly include physical capture methods such as flocculation, adsorption, and membrane filtration, as well as chemical degradation methods such as advanced oxidation and photocatalysis, and biodegradation methods. CN114956339A discloses a microplastic removal algae bed and method based on benthic filamentous green algae, which effectively absorbs nitrogen and phosphorus while efficiently collecting microplastics in river water. However, this method only physically adsorbs microplastics in river water, and there is a risk that microplastics will leak back into the ecosystem. Therefore, the physical capture method only temporarily separates microplastics and cannot guarantee that microplastics will be further released back into the environment, but the photocatalytic degradation method and the biodegradation method can permanently remove microplastics and their attached pollutants, and the reaction conditions are mild and the environmental load is low. However, photocatalytic technology is easily affected by the angle of the incident light source, resulting in uneven reaction sites; the biodegradation method is time-consuming and has low reaction efficiency. CN113213576A discloses a drum-type adsorption photocatalytic degradation device for microplastics in waters, but the photocatalytic reaction time and reactive area of ​​the device are limited, and the degradation efficiency is not high. CN113636716A discloses a method for treating polyester microplastics polluted water bodies in series, which connects photocatalytic degradation of pollutants with photocatalytic decomposition of water to produce hydrogen, but mainly the microplastics hydrolysis reaction products participate in the photocatalytic reaction, and the green degradation of microplastics is not achieved, and no related devices are designed. Considering the synergistic promotion of microplastic degradation by a combination of multiple technologies is a rational solution. CN217323568U discloses a combined reactor for microplastic treatment, in which flocculation precipitation method and biological method are used in the treatment process. The flocculation precipitation method can accelerate the degradation of microplastics by microorganisms, and the microbial treatment method can decompose microplastics into small molecules such as terephthalic acid and ethylene glycol, reducing pollution to the environment. However, the flocculant and the strain in the same environment will affect the activity of the strain, and the intermittent reactor is not suitable for large-scale water microplastic treatment.

[0004] The above strategies all have their limitations. Therefore, there is an urgent need for a new type of microplastic biodegradation coupled photocatalytic treatment device to achieve the purpose of synergistically promoting the efficient removal of microplastics in water bodies, being green and friendly, and having a low environmental load. Utility Model Content

[0005] The purpose of this application is to provide a microplastic biodegradation coupled photocatalytic treatment device, which can efficiently and environmentally friendly promote the degradation and removal of microplastics, thereby reducing environmental pollution.

[0006] The purpose of this application is achieved through the following technical solutions:

[0007] A microplastic biodegradation coupled photocatalytic treatment device, comprising:

[0008] First pipeline;

[0009] The photocatalytic system comprises a first accommodating space, the first pipe is connected to the first accommodating space, a plurality of reaction tubes and a plurality of driving components are arranged in the first accommodating space, the reaction tubes are provided with photocatalysts, and the reaction tubes are installed at the power output end of the driving component for controlling the rotation of the reaction tubes;

[0010] Second pipeline;

[0011] The biodegradation tower has a second accommodating space, wherein the first accommodating space and the second accommodating space are connected through the second pipe, and the second pipe is arranged at the top of the second accommodating space, and a filter assembly and a suspended filler are arranged in the second accommodating space, and the suspended filler is placed on the filter assembly;

[0012] The third pipeline;

[0013] The algae treatment system comprises a third accommodating space, wherein the second accommodating space and the third accommodating space are connected through the third pipe, and the third accommodating space is provided with algae;

[0014] The fourth pipeline;

[0015] A liquid storage tank, wherein the third accommodating space and the liquid storage tank are communicated with each other through the fourth pipe.

[0016] In some embodiments of the present application, an aeration device is further included, wherein the aeration device has an aeration plate, a gas disperser, an air intake pipe and an air compressor, wherein the aeration plate and the gas disperser are both arranged at the bottom of the second accommodating space, the aeration plate has a plurality of through holes arranged at intervals, the gas disperser is arranged opposite to the through holes and toward the filter assembly, and the gas disperser and the air compressor are connected through the air intake pipe.

[0017] In some embodiments of the present application, the aeration device further comprises a first flow meter and a first valve, and the first flow meter and the first valve are both arranged on the air inlet pipe.

[0018] In some embodiments of the present application, a second flow meter and a third flow meter are further included, wherein the second flow meter is disposed on the first pipeline, and the third flow meter is disposed on the fourth pipeline.

[0019] In some embodiments of the present application, a first pump and a second pump are further included, wherein the first pump is disposed on the first pipeline, and the second pump is disposed on the second pipeline.

[0020] In some embodiments of the present application, a second valve, a third valve and a fourth valve are further included, wherein the second valve is arranged on the first pipeline, the third valve is arranged on the second pipeline, and the fourth valve is arranged on the fourth pipeline.

[0021] In some embodiments of the present application, the photocatalytic system is further provided with a rotating rod, which connects the reaction tube and the driving component.

[0022] In some embodiments of the present application, the photocatalytic system is further provided with a first heating plate, and the first heating plate is arranged outside the first accommodating space to change the temperature of the first accommodating space.

[0023] In some embodiments of the present application, the filter assembly includes a primary filter, a secondary filter and a tertiary filter, and the primary filter, the secondary filter and the tertiary filter are arranged in sequence between the second pipe and the third pipe, and the apertures of the primary filter, the secondary filter and the tertiary filter gradually decrease.

[0024] In some embodiments of the present application, the biodegradation tower is further provided with a second heating plate, and the second heating plate is arranged outside the second accommodating space to change the temperature of the second accommodating space.

[0025] The microplastic biodegradation coupled photocatalytic treatment device of the present application introduces wastewater through a first pipe, and the wastewater flows into the first accommodating space of the photocatalytic system. The reaction tube loaded with a photocatalyst reacts with the microplastics in the wastewater, thereby realizing the first step of the photocatalytic reaction. The driving component can rotate the reaction tube to improve the efficiency of the photocatalytic reaction. The second pipe introduces the wastewater after the photocatalytic reaction into the biodegradation tower, realizes biodegradation through suspended fillers, and uses a filter component for filtering, thereby completing the second step of the biodegradation reaction. Then, the wastewater treated by the biodegradation reaction is introduced into the algae treatment system through a third pipe. The algae treatment system is provided with algae, which can further adsorb and intercept a small amount of unreacted microplastics and the previous reaction products. Through the above-mentioned three series-connected treatment systems, the degradation and removal of microplastics can be synergistically promoted. It has the advantages of high reaction efficiency, mild reaction conditions, low environmental load, and green environmental protection. The overall device is simple, reasonably designed, and highly operable. The degradation efficiency is improved through a multi-stage degradation device, and environmental pollution is reduced, which has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of the microplastic biodegradation coupled photocatalytic treatment device of the present application.

[0027] In the figure, 1, first pipeline; 2, photocatalytic system; 201, first accommodation space; 202, reaction tube; 203, driving component; 204, rotating rod; 205, first heating plate; 3, second pipeline; 4, biodegradation tower; 401, second accommodation space; 402, filter assembly; 4021, primary filter; 4022, secondary filter; 4023, tertiary filter; 403, suspended filler; 404, second heating plate; 5, third pipeline; 6, algae treatment system; 601, third accommodating space; 602, algae; 7, fourth pipeline; 8, liquid storage tank; 9, aeration device; 901, aeration orifice plate; 9011, through hole; 902, gas disperser; 903, air intake pipeline; 904, air compressor; 905, first flow meter; 906, first valve; 10, second flow meter; 11, third flow meter; 12, first pump; 13, second pump; 14, second valve; 15, third valve; 16, fourth valve. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. used in the present application to indicate the orientation or position relationship is based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1As shown, the embodiment of the present application proposes a microplastic biodegradation coupled photocatalytic treatment device, comprising: a first pipeline 1, a photocatalytic system 2, a second pipeline 3, a biodegradation tower 4, a third pipeline 5, an algae treatment system 6, a fourth pipeline 7 and a liquid storage tank 8, the photocatalytic system 2 has a first accommodating space 201, the first pipeline 1 is connected to the first accommodating space 201, a plurality of reaction tubes 202 and a plurality of driving components 203 are arranged in the first accommodating space 201, the reaction tube 202 is provided with a photocatalyst, and the reaction tube 202 is installed at the power output end of the driving component 203, which is used to control the rotation of the reaction tube 202, and the biodegradation tower 4 has A second accommodating space 401, the first accommodating space 201 and the second accommodating space 401 are connected through the second pipe 3, and the second pipe 3 is arranged at the top of the second accommodating space 401, a filter component 402 and a suspended filler 403 are arranged in the second accommodating space 401, and the suspended filler 403 is placed on the filter component 402, the algae treatment system 6 has a third accommodating space 601, the second accommodating space 401 and the third accommodating space 601 are connected through the third pipe 5, algae 602 are arranged in the third accommodating space 601, and the third accommodating space 601 and the liquid storage tank 8 are connected through the fourth pipe 7.

[0032] Based on the above technical scheme, the microplastic biodegradation coupled photocatalytic treatment device of the present application introduces wastewater through the first pipe 1, and the wastewater flows into the first accommodating space 201 of the photocatalytic system 2, and reacts with the microplastics in the wastewater through the reaction tube 202 loaded with a photocatalyst, thereby realizing the first step of the photocatalytic reaction. The driving component 203 can rotate the reaction tube 202 to improve the efficiency of the photocatalytic reaction. The second pipe 3 introduces the wastewater after the photocatalytic reaction into the biodegradation tower 4, and biodegradation is achieved through the suspended filler 403, and the filter component 402 is used for filtration, thereby completing the second step of the biodegradation reaction. Then, the wastewater treated by the biodegradation reaction is introduced into the algae treatment system 6 through the third pipe 5. The algae treatment system 6 is provided with algae 602, which can further adsorb and intercept a small amount of unreacted microplastics and the previous reaction products. Through the above three series-connected treatment systems, the degradation and removal of microplastics can be synergistically promoted, which has the advantages of high reaction efficiency, mild reaction conditions, low environmental load, and green environmental protection. The overall device is simple, reasonably designed, and highly operable. The degradation efficiency is improved through the multi-stage degradation device, and environmental pollution is reduced, which has broad application prospects. When in use, the photocatalytic system 2 can add light source facilities as needed, such as ultraviolet lamps, mercury lamps, xenon lamps, LED light sources, etc.; the reaction tube 202 in the photocatalytic system 2 is preferably a glass fiber matrix loaded with a photocatalyst, and the glass fiber matrix is ​​a dendritic multi-level glass fiber, and the dendritic multi-level glass fiber is arranged in a forked and multi-layered manner, similar to the shape of a branch, which can effectively increase the residence time of microplastics while increasing the reaction active sites, thereby improving the efficiency of the photocatalytic reaction; the photocatalyst can be an ultraviolet light responsive photocatalyst or a visible light responsive photocatalyst, including one or more of metal oxides, metal nitrides, metal nitrogen oxides, metal sulfides, graphite phase carbon nitrides, metal phthalocyanines, MOFs, COFs, graphene, Mxene, black phosphorus and other materials, to drive the degradation reaction of microplastics and organic pollutants; the suspended filler 403 in the biodegradation tower 4 is loaded with microorganisms and / or or biological enzymes, the microorganisms include bacteria such as Pseudomonas, Bacillus, Streptomyces, Escherichia, cocci, micrococci, rhodococcus, actinomycetes, thermophilic actinomycetes, Enterobacter, Pantoea and the like and one or more of the corresponding genetically engineered bacteria, and also include fungi such as Aspergillus, Penicillium, Fusarium, yeast, Cladosporium, Candida, Fusarium solani, Alternaria solani and the like and one or more of the corresponding genetically engineered fungi, preferably, the microorganisms are selected from Bacillus subtilis, Pseudomonas and the corresponding genetically engineered bacteria; in addition, the suspended filler 403 also includes one or more of activated carbon, zeolite, cyclodextrin, carbon fiber, chitin fiber, and porous materials; the algae 602 in the algae treatment system 6 includes one or more of filamentous algae, diatoms, brown algae, green algae, red algae, blue-green algae, spirulina, microalgae, Anabaena, Scenedesmus, cocci, and boat-shaped algae.

[0033] In some embodiments of the present application, Figure 1 As shown, it also includes an aeration device 9, which has an aeration hole plate 901, a gas disperser 902, an air intake pipe 903 and an air compressor 904. The aeration hole plate 901 and the gas disperser 902 are both arranged at the bottom of the second accommodating space 401. The aeration hole plate 901 has a plurality of through holes 9011 arranged at intervals. The gas disperser 902 is arranged opposite to the through holes 9011 and toward the filter assembly 402. The gas disperser 902 and the air compressor 904 are connected through the air intake pipe 903. The aeration device 9 helps to evenly disperse the suspended filler 403 loaded with biological enzymes in the biodegradation tower 4, promoting sufficient contact between the water body and the suspended filler 403. At the same time, the bubbles it produces can enhance the shedding of aged biofilms and maintain the growth and metabolic activity of the biofilms. The aeration plate 901 is preferably a porous support plate with a pore size of 0.5 mm and a spacing of 5 mm. The gas disperser 902 is supplied with conveying gas by the air compressor 904, and bubbles are generated through the through holes 9011 of the aeration plate 901.

[0034] Specifically, Figure 1 As shown, the aeration device 9 also has a first flow meter 905 and a first valve 906, both of which are arranged on the air intake pipe 903. The first flow meter 905 can intuitively display the gas flow in the air intake pipe 903, and the first valve 906 can control the opening and closing of the air intake pipe 903, which is more flexible to use.

[0035] In some embodiments of the present application, Figure 1 As shown, the second flow meter 10 and the third flow meter 11 are also included. The second flow meter 10 is arranged on the first pipeline 1, and the third flow meter 11 is arranged on the fourth pipeline 7. The second flow meter 10 is used to display the liquid flow in the first pipeline 1, and the third flow meter 11 is used to display the liquid flow in the fourth pipeline 7, so as to display the liquid flow condition of each part.

[0036] In some embodiments of the present application, Figure 1 As shown, the first pump 12 and the second pump 13 are also included, wherein the first pump 12 is arranged on the first pipeline 1, and the second pump 13 is arranged on the second pipeline 3. The first pump 12 can conveniently and quickly pump wastewater from the outside into the photocatalytic system 2, and the second pump 13 can conveniently and quickly pump wastewater that has undergone photocatalytic reaction from the photocatalytic system 2 into the biodegradation tower 4.

[0037] In some embodiments of the present application, Figure 1As shown, the second valve 14, the third valve 15 and the fourth valve 16 are also included, wherein the second valve 14 is arranged on the first pipeline 1, the third valve 15 is arranged on the second pipeline 3, and the fourth valve 16 is arranged on the fourth pipeline 7. The second valve 14 is used to control the opening and closing of the first pipeline 1, the third valve 15 is used to control the opening and closing of the second pipeline 3, and the fourth valve 16 is used to control the opening and closing of the fourth pipeline 7, thereby realizing the precise control of each part of the entire microplastic biodegradation coupled photocatalytic treatment device.

[0038] In some embodiments of the present application, Figure 1 As shown, the photocatalytic system 2 is further provided with a rotating rod 204, and the rotating rod 204 connects the reaction tube 202 and the driving component 203. The rotating rod 204 can help the reaction tube 202 to rotate, promote uniform irradiation of the incident light source, increase the illumination area, and make the photocatalytic reaction more efficient.

[0039] In some embodiments of the present application, Figure 1 As shown, the photocatalytic system 2 is further provided with a first heating plate 205, which is arranged outside the first accommodating space 201 and is used to change the temperature of the first accommodating space 201. The first heating plate 205 can change the temperature of the first accommodating space 201 according to actual conditions to improve the efficiency of the photocatalytic reaction.

[0040] In some embodiments of the present application, Figure 1 As shown, the filter assembly 402 includes a primary filter 4021, a secondary filter 4022, and a tertiary filter 4023, which are sequentially arranged between the second pipe 3 and the third pipe 5, and the apertures of the primary filter 4021, the secondary filter 4022, and the tertiary filter 4023 gradually decrease. The multi-stage filtration filter assembly 402 can achieve a better filtration effect, and the tertiary filter 4023 ensures that the microplastics can fully contact and react with the suspended filler 403 on the filter, so that it has sufficient reaction time, thereby achieving a better biodegradation effect.

[0041] In some embodiments of the present application, Figure 1 As shown, the biodegradation tower 4 is further provided with a second heating plate 404, which is arranged outside the second accommodating space 401 and is used to change the temperature of the second accommodating space 401. The second heating plate 404 can flexibly change the temperature in the biodegradation tower 4 according to the optimal reaction conditions of different strains, so as to make the biodegradation reaction more efficient.

[0042] Here is the specific use process of the microplastic biodegradation coupled photocatalytic treatment device:

[0043] Before use, the reaction tube 202 in the photocatalytic system 2 is loaded with one or more photocatalysts, and the suspended filler 403 in the biodegradation tower 4 is loaded with one or more bacteria and fungi. The first pump 12 introduces the water containing microplastics into the photocatalytic system 2, and the driving component 203 is turned on to drive the reaction tube 202 to rotate 360 ​​degrees. The volume of water entering the reaction system and the reaction residence time are controlled by the second flowmeter 10 and the second valve 14 on the first pipeline 1, and the reaction temperature of the photocatalytic system 2 is controlled by the first heating plate 205. The water body after the photocatalytic reaction is input into the biodegradation tower 4 through the second pump 13. After being intercepted by the first filter 4021, the second filter 4022, and the third filter 4023, the microplastics have sufficient reaction time with the enzymes in the suspended filler 403 in the tower. The suspended filler 403 is evenly dispersed in the biodegradation tower 4 through the aeration device 9 and fully contacts with the microplastics. At the same time, the bubble generation can enhance the shedding of the aged biofilm and maintain the metabolic activity of the biofilm growth. At the same time, the second heating plate 404 can control the reaction temperature of the biodegradation tower 4, which is suitable for the optimal reaction conditions of different strains. The water body after the reaction in the biodegradation tower 4 is then introduced into the algae treatment system 6, and the algae 602 of suitable species are selected to adsorb and intercept a small amount of unreacted microplastics and the previous reaction products. The clean water body after degradation treatment is finally stored in the liquid storage tank 8.

[0044] In summary, the microplastic biodegradation coupled photocatalytic treatment device of the present application introduces wastewater through the first pipe 1, and the wastewater flows into the first accommodating space 201 of the photocatalytic system 2. The reaction tube 202 loaded with a photocatalyst reacts with the microplastics in the wastewater, thereby realizing the first step of the photocatalytic reaction. The driving component 203 can rotate the reaction tube 202 to improve the efficiency of the photocatalytic reaction. The second pipe 3 introduces the wastewater after the photocatalytic reaction into the biodegradation tower 4, and biodegradation is achieved through the suspended filler 403, and the filter component 402 is used for filtration, thereby completing the second step of the biodegradation reaction. Then, the wastewater treated by the biodegradation reaction is introduced into the algae treatment system 6 through the third pipe 5. The algae treatment system 6 is provided with algae 602, which can further adsorb and intercept a small amount of unreacted microplastics and the previous reaction products. Through the above-mentioned three series-connected treatment systems, the degradation and removal of microplastics can be synergistically promoted, which has the advantages of high reaction efficiency, mild reaction conditions, low environmental load, and green environmental protection. The overall device is simple, reasonably designed, and highly operable. The degradation efficiency is improved through the multi-stage degradation device, and environmental pollution is reduced, which has broad application prospects.

[0045] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present application. These improvements and substitutions should also be regarded as the scope of protection of the present application.

Claims

1. A microplastic biodegradation coupled photocatalytic treatment device, characterized in that: include: A first pipeline (1); The photocatalytic system (2) comprises a first accommodating space (201), the first pipeline (1) being in communication with the first accommodating space (201), a plurality of reaction tubes (202) and a plurality of driving components (203) being arranged in the first accommodating space (201), the reaction tubes (202) being provided with photocatalysts, and the reaction tubes (202) being mounted on the power output end of the driving component (203) for controlling the rotation of the reaction tubes (202); Second pipeline (3); A biodegradation tower (4) having a second accommodating space (401), wherein the first accommodating space (201) and the second accommodating space (401) are connected via the second pipe (3), and the second pipe (3) is arranged at the top of the second accommodating space (401), and a filter assembly (402) and a suspended filler (403) are arranged in the second accommodating space (401), and the suspended filler (403) is placed on the filter assembly (402), and the suspended filler (403) is loaded with microorganisms and / or biological enzymes; The third pipeline (5); The algae treatment system (6) comprises a third accommodating space (601), wherein the second accommodating space (401) and the third accommodating space (601) are connected via the third pipe (5), and algae (602) are arranged in the third accommodating space (601); Fourth pipeline (7); A liquid storage tank (8), wherein the third accommodating space (601) and the liquid storage tank (8) are connected via the fourth pipeline (7).

2. The microplastic biodegradation coupled photocatalytic treatment device according to claim 1 is characterized in that: The invention also comprises an aeration device (9), wherein the aeration device (9) comprises an aeration plate (901), a gas disperser (902), an air intake pipe (903) and an air compressor (904); the aeration plate (901) and the gas disperser (902) are both arranged at the bottom of the second accommodating space (401); the aeration plate (901) has a plurality of through holes (9011) arranged at intervals; the gas disperser (902) is arranged opposite to the through holes (9011) and toward the filter assembly (402); and the gas disperser (902) and the air compressor (904) are connected via the air intake pipe (903).

3. The microplastic biodegradation coupled photocatalytic treatment device according to claim 2 is characterized in that: The aeration device (9) further comprises a first flow meter (905) and a first valve (906), and the first flow meter (905) and the first valve (906) are both arranged on the air inlet pipe (903).

4. The microplastic biodegradation coupled photocatalytic treatment device according to claim 1, characterized in that: It also comprises a second flow meter (10) and a third flow meter (11), wherein the second flow meter (10) is arranged on the first pipeline (1), and the third flow meter (11) is arranged on the fourth pipeline (7).

5. The microplastic biodegradation coupled photocatalytic treatment device according to claim 1, characterized in that: It also comprises a first pump (12) and a second pump (13), wherein the first pump (12) is arranged on the first pipeline (1), and the second pump (13) is arranged on the second pipeline (3).

6. The microplastic biodegradation coupled photocatalytic treatment device according to claim 1, characterized in that: It also comprises a second valve (14), a third valve (15) and a fourth valve (16), wherein the second valve (14) is arranged on the first pipeline (1), the third valve (15) is arranged on the second pipeline (3), and the fourth valve (16) is arranged on the fourth pipeline (7).

7. The microplastic biodegradation coupled photocatalytic treatment device according to claim 1, characterized in that: The photocatalytic system (2) is further provided with a rotating rod (204), and the rotating rod (204) connects the reaction tube (202) and the driving component (203).

8. The microplastic biodegradation coupled photocatalytic treatment device according to claim 1, characterized in that: The photocatalytic system (2) is also provided with a first heating plate (205), which is arranged outside the first accommodating space (201) and is used to change the temperature of the first accommodating space (201).

9. The microplastic biodegradation coupled photocatalytic treatment device according to claim 1, characterized in that: The filter assembly (402) comprises a primary filter (4021), a secondary filter (4022) and a tertiary filter (4023), wherein the primary filter (4021), the secondary filter (4022) and the tertiary filter (4023) are arranged in sequence between the second pipe (3) and the third pipe (5), and the apertures of the primary filter (4021), the secondary filter (4022) and the tertiary filter (4023) gradually decrease.

10. The microplastic biodegradation coupled photocatalytic treatment device according to claim 1, characterized in that: The biodegradation tower (4) is further provided with a second heating plate (404), which is arranged outside the second accommodating space (401) and is used to change the temperature of the second accommodating space (401).

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