Microalgae reaction system and indoor air purification system with emission reduction and oxygen increase functions

Abstract

The application provides a microalgae reaction system and an indoor air purification system with carbon emission reduction and oxygen increase functions, and a microalgae hydrogel layer is adopted in a carbon fixation element of the microalgae reaction system, specifically, a fiber net frame is adopted as a framework of the microalgae hydrogel layer, so that the microalgae hydrogel is ensured to be fully contacted with air and the light utilization efficiency of the microalgae is improved, the microalgae is convenient to realize "air washing" and biomass recycling under indoor light conditions, the microalgae reaction box is prevented from being too high in air resistance, indoor CO2-O2 gas circulation and microalgae carbon fixation and oxygen increase are realized, and the indoor air quality is improved while the carbon emission is reduced.

Description

Technical Field

[0001] This invention relates to the field of microalgae indoor air purification technology, specifically to a microalgae reaction system and an indoor air purification system with emission reduction and oxygenation functions. Background Technology

[0002] Currently, indoor air purifiers primarily target particulate matter and toxic gases such as formaldehyde, with some also offering sterilization and disinfection functions. However, products for purifying carbon dioxide are still relatively new. Under normal circumstances, the concentration of carbon dioxide in indoor air is generally between 500 and 700 ppm, while an adult produces 22.6 liters of carbon dioxide per hour, which can accumulate indoors at several to dozens of times higher levels. Studies show that indoor carbon dioxide concentrations in bedrooms, dormitories, and offices are highly likely to exceed safe levels, negatively impacting human health and well-being.

[0003] To address this situation, natural carbon sequestration methods are generally employed indoors, using green plants to improve the indoor environment. However, plant carbon sequestration is subject to numerous constraints, including light intensity, season, and efficiency. Typical C3 plants have a peak photosynthetic efficiency below 3.5%, while typical C4 plants have an efficiency below 4.3%. Specifically, under indoor lighting conditions, the photosynthetic efficiency of houseplants such as pothos, white butterfly, anthurium, red diamond, purple-edged jade, and silver queen is below 3.00 μmol / (m²·s).

[0004] Air purifiers utilize various technologies and media, with solid-phase media being the most common. Currently, purifiers using liquid components for purification are rare, and their effectiveness is still developing. While some "water-washing" air purifiers on the market capture and dissolve dust and organic pollutants such as benzene and aldehydes through spraying, existing liquid-phase air purifiers primarily do not target carbon dioxide. Therefore, establishing an efficient carbon sequestration system that increases indoor oxygen levels and reduces emissions is crucial for healthy homes and green living.

[0005] Combining microalgae with air purifiers can effectively leverage their unique characteristics. Common microalgae, such as Chlorella, can achieve a carbon sequestration efficiency of up to 23 mg / (L*h), with a peak photosynthetic efficiency of approximately 8%. However, the technology utilizing microalgae for carbon sequestration is primarily used for large-scale industrial carbon dioxide removal. Due to their robust vitality, excellent carbon sequestration efficiency, and ability to adapt to large-scale cultivation, large-scale airlift liquid culture of microalgae to absorb high concentrations of carbon dioxide is a green, energy-saving, and economically viable carbon sequestration solution. However, large-scale liquid culture of microalgae is not suitable for confined indoor environments, and the process of aeration into the liquid generates significant resistance, resulting in noise and power consumption issues that are unsuitable for indoor settings.

[0006] Therefore, establishing an air purification system that can efficiently fix carbon and achieve indoor oxygenation and emission reduction is of great significance for healthy homes and green living. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, the main objective of this invention is to provide a microalgae reaction system and an indoor air purification system with emission reduction and oxygenation functions. The carbon fixation element in the microalgae reaction system adopts a microalgae hydrogel layer, specifically using a support mesh frame as the skeleton of the microalgae hydrogel layer. This ensures that the microalgae hydrogel layer is in full contact with the air and improves the light utilization efficiency of the microalgae. It facilitates the "air washing" of microalgae and the recycling of microalgae biomass under indoor light conditions. It also prevents excessive wind resistance in the microalgae reaction chamber, realizing indoor CO2-O2 gas circulation and microalgae carbon fixation and oxygenation, thereby reducing emissions while improving indoor air quality.

[0008] To achieve the above objectives, according to a first aspect of the present invention, a microalgae reaction system is provided.

[0009] The microalgae reaction system includes:

[0010] The reaction chamber is equipped with a gas inlet and a gas outlet;

[0011] A microalgae carbon fixation element is placed inside the reaction chamber; the microalgae carbon fixation element includes a support mesh frame and a microalgae hydrogel layer covering the support mesh frame.

[0012] Furthermore, the microalgae hydrogel layer is formed on the support frame using 3D bioprinting technology, and the thickness of the microalgae hydrogel layer is 1-3 mm.

[0013] Preferably, the support frame comprises multiple solid optical fibers, which are interwoven and wrapped around each other to form the frame.

[0014] Furthermore, the reaction chamber is rectangular in shape, and the gas outlet is located on the top surface of the reaction chamber; the gas inlet is located on the side of the reaction chamber and is positioned away from the gas outlet.

[0015] Preferably, the gas outlet of the reaction chamber is equipped with an isolation net.

[0016] Furthermore, the bottom of the reaction chamber is provided with a communication port, or the bottom of the reaction chamber is open.

[0017] Furthermore, it also includes a supplemental lighting system installed inside the reaction chamber.

[0018] To achieve the above objectives, according to a second aspect of the present invention, an indoor air purification system with emission reduction and oxygenation functions is provided.

[0019] This indoor air purification system with emission reduction and oxygen enhancement functions includes a microalgae life support system and the aforementioned microalgae reaction system; wherein:

[0020] The microalgae life support system includes:

[0021] A storage tank is used to provide nutrient solution for the microalgae carbon fixation element;

[0022] A reflux tank is disposed between the reaction tank and the storage tank, and the reflux tank is connected to the reaction tank for recovering residual liquid; the reflux tank and the storage tank are connected to each other.

[0023] Furthermore, the storage tank is equipped with a removable filter element, and the interior of the storage tank is divided into a first storage chamber and a second storage chamber by the filter element. The bottom of the first storage chamber is horizontally arranged, and the bottom of the second storage chamber is inclined relative to the bottom of the first storage chamber. The first storage chamber is used for nutrient solution storage, and the second storage chamber is connected to the reflux pool.

[0024] Furthermore, the tilt angle of the second storage chamber gradually increases from the end closer to the filter element to the end farther away from the filter element.

[0025] Furthermore, the first storage chamber is equipped with a delivery pump and a timer controlled and connected to the delivery pump;

[0026] The delivery pump is connected to a rotating nozzle for uniformly spraying the nutrient solution.

[0027] Furthermore, the bottom of the reflux pool is connected to the second storage chamber, and the bottom of the reflux pool is inclined, with its inclination angle relative to the horizontal plane gradually increasing from the connection point to the end away from the second storage chamber.

[0028] This invention utilizes microalgae photosynthesis to efficiently utilize indoor light sources, designing a microalgae reaction system and air purification system with emission reduction and oxygenation functions. This system uses microalgae as carbon-fixing microorganisms, achieving an integrated upgrade of CO2-O2 gas circulation, microalgae carbon fixation and oxygenation, and microalgae recycling. It combines the air purification function of traditional air purifiers with microalgae photosynthesis, achieving more comprehensive and efficient indoor air purification, improving indoor air quality, and contributing to the "dual carbon" policy at the home level.

[0029] In this invention, a solid optical fiber with light-guiding function is used as the supporting framework for the microalgae hydrogel layer, and the microalgae hydrogel layer is prepared by combining it with 3D bioprinting technology. This layer is then coupled with an indoor air purifier to achieve the effects of emission reduction and oxygen increase.

[0030] In this invention, microalgae hydrogels are fixed on a support frame, with pores between the microalgae hydrogels to ensure smooth gas flow, thereby preventing excessive air resistance inside the microalgae reaction chamber and ensuring that the carbon fixation requirements are met.

[0031] In this invention, the storage tank adopts a two-stage structure, which separates and filters the clean culture medium and the collected residual liquid through a microfiltration membrane, ensuring that the culture medium in the storage tank is not contaminated by microalgae, and also preventing microalgae from consuming the nutrient solution and growing in the storage tank.

[0032] In this invention, by setting up a supplementary lighting system, the on / off state of the lighting components can be controlled autonomously. The supplementary lighting system is only turned on when necessary, thereby ensuring the light conditions required for microalgae growth while reducing the power consumption of the light source.

[0033] Advantages of this invention:

[0034] 1. Compared with traditional air purifiers, this invention has carbon sequestration and oxygenation functions.

[0035] 2. Compared with plant carbon fixation, the present invention utilizes microalgae for carbon fixation, which has higher efficiency and higher economic returns.

[0036] 3. Compared with large-scale industrial microalgae carbon fixation, this invention consumes less power, occupies less space, has less airflow resistance, and is more adaptable to indoor environments. Attached Figure Description

[0037] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0038] Figure 1 This is a schematic diagram of the structure of an indoor air purification system with emission reduction and oxygenation functions provided in the embodiments of the present invention;

[0039] Figure 2 This is a schematic diagram of the microalgae reaction system provided in the embodiments of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the through-fiber in an embodiment of the present invention;

[0041] Figure 4 This is a schematic diagram of the microalgae life support system provided in the embodiments of the present invention.

[0042] In the picture:

[0043] 1. Supporting grid frame; 2. Reaction chamber; 3. Gas inlet; 4. Gas outlet; 5. Connecting port; 6. Through-body optical fiber; 7. Reflux tank; 8. Storage tank; 8-1. First storage chamber; 8-2. Second storage chamber; 9. Rotating nozzle; 10. Filter element; 11. Delivery pump; 12. Timer; 13. Supplemental lighting system; 14. Isolation net; 15. Window; 16. Interface. Detailed Implementation

[0044] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0045] Hydrogels are gels composed of a highly hydrophilic three-dimensional network structure. Due to the presence of cross-linked networks, hydrogels can swell rapidly in water without dissolving, thus allowing them to retain a large amount of water.

[0046] With the improvement of 3D printing technology, people have gradually expanded their ability to prepare scaffolds with complex structures that can be used for tissue engineering. It is foreseeable that using 3D-printed hydrogels to support microalgae to create semi-solid carbon fixation cores can produce various types of carbon fixation components adapted to different environments, thereby reducing noise, lowering power consumption, and better adapting to indoor environments.

[0047] According to a specific embodiment of the present invention, a microalgae reaction system is provided that can be used for indoor air purification to upgrade home air purifiers.

[0048] like Figure 1 As shown, the microalgae reaction system includes a reaction chamber 2 and a microalgae carbon fixation element disposed within the reaction chamber 2. The reaction chamber 2 has a gas inlet 3 and a gas outlet 4 to facilitate the inflow and outflow of air. The microalgae carbon fixation element includes a support frame 1 and a microalgae hydrogel layer covering the support frame 1. Due to the mesh structure design of the support frame 1, gas can circulate both inside and outside the entire microalgae carbon fixation element. This microalgae reaction system achieves the fixation of microalgae hydrogel through the design of the microalgae carbon fixation element and ensures that the microalgae hydrogel layer is in full contact with the air. For example, air purified by a household air purifier enters the microalgae reaction system through the gas inlet, comes into contact with the microalgae hydrogel layer, and utilizes microalgae photosynthesis to achieve carbon dioxide fixation and oxygen production. The purified air flows out through the gas outlet 4.

[0049] In some embodiments of the present invention, the reaction chamber 2 is in the shape of a cuboid, such as a cuboid with dimensions of 40cm*10cm*40cm, and the material of the reaction chamber 2 can be 2mm thick transparent plexiglass.

[0050] It should be noted that the specific structural shape of reaction chamber 2 can also be designed according to actual needs, without specific limitations.

[0051] In some embodiments of the present invention, a window 15, such as a viewing window, may be provided on the reaction chamber 2 as needed to better observe the internal conditions of the reaction chamber 2.

[0052] like Figure 2 As shown, the gas outlet 4 is located on the top surface of the reaction chamber 2, and the gas inlet 3 is located on the side of the reaction chamber 2. The gas inlet 3 is positioned away from the gas outlet 4, which maximizes the "air washing" and achieves efficient air purification.

[0053] In an embodiment of the present invention, the gas inlet 3 of the reaction chamber 2 is located in the lower middle part of one side, and the size can be designed to be 38cm*10cm, so that air flows in from the bottom of the reaction chamber 2 and flows out from the top of the reaction chamber 2.

[0054] In an embodiment of the present invention, the microalgae hydrogel layer is formed on the support frame 1 using 3D bioprinting technology. Specifically, the semi-solid microalgae hydrogel is printed and attached to the support frame 1 so that it adheres tightly and is not easy to fall off, thereby forming a microalgae carbon fixation element.

[0055] As an embodiment of the present invention, the thickness of the microalgae hydrogel layer can be 1 to 3 mm.

[0056] It is worth mentioning that the preparation of the semi-solid microalgae hydrogel for 3D bioprinting technology in this embodiment of the invention includes the following steps:

[0057] (1) Prepare a 2.5% sodium alginate solution and a 2% calcium chloride solution.

[0058] (2) Place the hydrogel precursor solution (2.5% sodium alginate solution) in an ultrasonic cleaner and sonicate at 50% amplitude for 30 seconds. After standing for 15 minutes, sonicate the precursor solution again under the same conditions.

[0059] (3) Remove air bubbles: Pour the hydrogel precursor solution from step (2) into a centrifuge tube and centrifuge at 2000r for 3 minutes.

[0060] (4) Preparation of bio-ink: After centrifuging and resuspending the microalgae cultured in BG11 culture medium, pour it into the precursor solution, stir evenly, and centrifuge at 2000r for 3 minutes to remove air bubbles.

[0061] (5) Printing the hydrogel: After centrifugation, stir the bio-ink thoroughly and pour it into the syringe, ensuring even mixing and avoiding air bubbles. Secure the syringe to the smart injection pump. Connect the power supply and set the parameters (gel layer thickness 1-3 mm). Drop the bio-ink into the calcium chloride solution (where the woven fiber optic mesh is placed) for rapid gel formation. After printing, allow it to stand for 2 hours or store it in the refrigerator.

[0062] This invention takes into account the application scenario of low-light indoor lighting conditions, and therefore uses a through-fiber 6 with light transmission function to enhance the light utilization efficiency of the microalgae hydrogel layer and achieve efficient carbon fixation. At the same time, it serves as a support for printing the microalgae hydrogel layer and is placed in the reaction chamber 2.

[0063] As one embodiment of the present invention, a solid optical fiber 6 is used as a support for the microalgae hydrogel layer, ensuring that it can absorb supplementary light sources well while having a certain rigidity.

[0064] like Figure 2 and Figure 3 As shown, the support frame 1 comprises multiple through-fiber optical fibers 6, which are interwoven and wrapped around each other to form a three-dimensional mesh structure with good support. Then, microalgae hydrogel is printed and attached to the through-fiber optical fibers 6 to ensure a tight fit and prevent detachment. Under low-light indoor lighting conditions or at night when no lighting is available and a backup light source is used, the light is transmitted through the through-fiber optical fibers 6, improving the light utilization efficiency of the microalgae hydrogel layer, promoting photosynthesis, and thus consuming carbon dioxide and increasing oxygen.

[0065] In an embodiment of the present invention, the through-fiber 6 can both supplement light and serve as a support frame. Specifically, one end of the through-fiber 6 can be perpendicular to the side of the reaction chamber 2 and parallel to the light source, serving as a light inlet.

[0066] In one implementation, nine through-fiber optical fibers 6 are installed on the left and right sides (corresponding to the 10cm mark), and 39 through-fiber optical fibers 6 are installed on the front and back sides (corresponding to the 40cm mark). The distance between two adjacent through-fiber optical fibers 6 is 1cm. Figure 3 As shown.

[0067] In an embodiment of the present invention, in order to ensure a tighter connection between the optical fibers 6, the optical fibers 6 are connected to each other using ethyl α-cyanoacrylate adhesive.

[0068] In an embodiment of the present invention, the diameter of the through-fiber 6 is 1.5 mm; the distance between two adjacent through-fibers 6 is 1 cm, thus forming a 1 cm gap on the support frame 1. 2 Grid.

[0069] As one specific implementation, the material of the optical fiber 6 can be methyl methacrylate (MMA).

[0070] In an embodiment of the present invention, in order to make full use of the residual kinetic energy of the air at the air outlet of a household air purifier, the microalgae reaction system can be connected to the air outlet of the household air purifier.

[0071] To prevent large particles from entering the microalgae reaction system, an isolation net 14 can be installed at the gas outlet 4 of the reaction chamber 2.

[0072] Alternatively, an isolation net 14 can be installed at the gas inlet 3 of the reaction chamber 2.

[0073] like Figure 2 As shown, an isolation net 14 is provided at the gas inlet 3 of the reaction chamber 2 to prevent large particulate impurities from entering the microalgae reaction system through the connection gap between the air outlet of the household air purifier and the microalgae reaction system.

[0074] As one embodiment of the present invention, the material of the isolation net 14 includes, but is not limited to, aluminum foil.

[0075] like Figure 2 As shown, the bottom of the reaction tank 2 is also provided with a connecting port 5 for the recovery of nutrient solution.

[0076] In another embodiment of the invention, the bottom of the reaction chamber 2 is open.

[0077] Of course, the bottom of the reaction chamber 2 can be designed according to the actual situation. The purpose is to connect the bottom of the reaction chamber 2 with the top of the reflux tank 7. Therefore, no specific restrictions are placed on the specific structural design.

[0078] In an embodiment of the present invention, when indoor lighting is inconvenient or too weak at night, the backup supplementary lighting system 13 inside the system can be turned on.

[0079] like Figure 1 As shown, the microalgae reaction system also includes a supplementary lighting system 13 installed inside the reaction chamber 2. The supplementary lighting system 13 can be connected to the through-body optical fiber 6, and the light is transmitted into the interior along the through-body optical fiber 6.

[0080] It is worth mentioning that the location of the supplementary lighting system 13 can be adjusted according to actual needs, without specific limitations.

[0081] In one embodiment of the present invention, the supplementary lighting system 13 includes a lighting component and a light control switch that works in conjunction with it. The lighting component can be a supplementary lighting strip, such as an LED chip.

[0082] In an embodiment of the present invention, two sets of lighting components are provided at the bottom of the reaction chamber 2. The front set contains 8 LEDs, and the right set contains 2 LEDs (LED power 2W, working current 3500mA, output brightness 1000lm). Each LED has an illumination range of 140°, illuminating multiple through-fiber optical fibers 6 respectively. The light path is conducted along the through-fiber optical fibers 6, supplementing the light to the microalgae carbon fixation element from the inside.

[0083] Meanwhile, the lighting component is connected to a light control switch. When the light intensity is below 450 Lux within a specific time period, the light control switch controls the lighting component to output a brightness of 1000 lm.

[0084] In this embodiment of the invention, the light-controlled switch is turned on and off by the conduction and blocking of a silicon controlled rectifier (SCR). When the detected light intensity (indoor light intensity) is lower than the preset light intensity, the SCR conducts, and the light-emitting component operates; when the detected light intensity is higher than the preset light intensity, the SCR is automatically delayed and blocked, and the light-emitting component stops operating.

[0085] As an embodiment of the present invention, the lighting components include, but are not limited to, patch-type COB red-blue mixed color plant lights.

[0086] The lighting components can use surface-mount COB (Chips On Board) red and blue mixed-color plant lights (which can emit electromagnetic spectrum suitable for photosynthesis and are used in applications where there is no natural light or supplemental lighting) as the light source.

[0087] According to a specific embodiment of the present invention, an indoor air purification system with emission reduction and oxygenation functions is also provided.

[0088] like Figure 1 As shown, the indoor air purification system includes a microalgae reaction system and a microalgae life support system located below the reaction chamber 2. This microalgae life support system maintains the activity of the microalgae carbon fixation elements and employs a two-stage structure. Specifically, the microalgae life support system includes a reflux tank 7 and a storage tank 8 connected vertically. The reflux tank 7 is positioned between the reaction chamber 2 and the storage tank 8, and is connected to the reaction chamber 2. The storage tank 8 is used for storing the culture medium, while the reflux tank 7 is used for reflux of the culture medium, enabling secondary utilization. The storage tank 8 can be used to periodically spray the culture medium onto the microalgae hydrogel layer to maintain the microalgae's survival conditions.

[0089] In some embodiments of the present invention, the microalgae bio-supplement culture medium is supplied in a timed and quantitative manner by the storage tank 8 to uniformly replenish the microalgae hydrogel layer. The culture medium is sprayed onto the microalgae carbon fixation element through a rotating nozzle 9, such as through a 2×2 atomizing nozzle matrix. The spraying power is provided by a delivery pump 11, such as a micro liquid pump, located inside the storage tank 8.

[0090] In an embodiment of the present invention, the rotation setting of the rotating nozzle 9 can more evenly spray the nutrient solution onto the microalgae hydrogel layer.

[0091] It is worth mentioning that an interface 16 can also be set on the side of the reaction chamber 2 for connecting the rotating nozzle 9, which facilitates the delivery of culture medium to the microalgae hydrogel layer.

[0092] like Figure 3 As shown, the storage tank 8 is equipped with a detachable filter element 10, which divides the tank into a first storage chamber 8-1 and a second storage chamber 8-2. The first storage chamber 8-1 of the storage tank 8 is equipped with a delivery pump 11 and a timer 12. The delivery pump 11 is externally connected to a rotating nozzle 9. The timer 12 can control the delivery pump 11 to uniformly replenish the culture medium to the microalgae hydrogel layer in a timely and quantitative manner. The second storage chamber 8-2 of the storage tank 8 is connected to the reflux tank 7. The residual liquid in the reflux tank 7 enters the first storage chamber 8-1 of the storage tank 8 through the filtration of the filter element 10.

[0093] In some embodiments of the present invention, the bottom of the first storage chamber 8-1 is horizontally arranged, and the bottom of the second storage chamber 8-2 is inclined relative to the bottom of the first storage chamber 8-1, with the angle of inclination relative to the horizontal plane gradually increasing from the end near the filter element 10 to the end away from the filter element 10. The inclined arrangement of the second storage chamber 8-2 can prevent residual liquid from accumulating inside it.

[0094] In this invention, excess culture medium is fully recycled and utilized. The excess culture medium is recycled through the bottom inclined groove-shaped reflux pool 7 and stored in the storage tank 8. The reflux residual liquid is collected in the second storage chamber 8-2 of the storage tank 8, and the clean culture medium is stored in the first storage chamber 8-1. The middle is separated by the filter element 10 to prevent microalgae from consuming the culture medium and growing in the storage tank 8.

[0095] like Figure 3 As shown, the top of the reflux tank 7 is connected to the reaction chamber I, and the bottom of the reflux tank 7 is provided with a first through hole and is connected to the second storage chamber 8-2 through the first through hole. The bottom of the reflux tank 7 is inclined to form a slanted groove structure, and the inclination angle relative to the horizontal plane gradually increases from the first through hole to the end away from the second storage chamber 8-2.

[0096] In one embodiment of the present invention, the reflux tank 7 is a sloping groove with dimensions of 40cm*10cm*5cm, and the diameter of the first through hole at the bottom is 5cm. It is connected to the storage tank 8, which has dimensions of 40cm*10cm*5cm. The dimensions of the single microalgae life support system formed are 40cm*10cm*10cm.

[0097] In embodiments of the present invention, the filter element 10 is a microfiltration membrane, which includes, but is not limited to, an immersed PVC alloy microfiltration membrane. Of course, membranes of other materials can also be used if they can achieve the technical effects of the present invention, and no specific limitation is made. For example, an RF (lined reinforced) hollow fiber microfiltration membrane is designed with a membrane flux of 25 L / m·h; a membrane service life of ≥5 years; and a membrane strength of >200 N / monofilament, and can be used for a long time in the nutrient solution storage tank 8.

[0098] It is worth mentioning that the algae removal rate of the microfiltration membrane (MF) made of immersion PVC alloy material is close to 100%.

[0099] As one embodiment of the present invention, the filter element 10 can adopt a drawer-type design structure, which is convenient for disassembly and for regular cleaning or replacement of the microfiltration membrane.

[0100] In another embodiment of the present invention, the filter element 10 can also be a plate structure, which is convenient to disassemble and has a simple structure.

[0101] In this invention, the structure of the filter element 10 can be selected and designed according to actual needs, with the aim of facilitating installation and disassembly.

[0102] In one embodiment of the present invention, the pore size of the microfiltration membrane is 0.1 μm to 1 μm. Since the diameter of microalgae generally ranges from 1 μm to 100 μm, the microfiltration membrane with this pore size design can retain all algae.

[0103] In the embodiments of the present invention, the culture medium used is BG11 medium (g / L), a special culture medium for microalgae cultivation: NaNO3 1.5, K2HPO4 0.04, MgSO4·7H2O 0.075, CaCl2·2H2O 0.036, citric acid 0.006, ferric ammonium citrate 0.006, EDTANa2 0.001, Na2CO3 0.02, A5 1mL.

[0104] Among them, A5 (trace elements, g / L): H3BO3 2.86, MnCl2·4H2O 1.86, ZnSO4·7H2O 0.22, Na2MoO4·2H2O 0.39, CuSO4·5H2O 0.08, CoCl2·6H2O 0.05, pH 7.1.

[0105] In one embodiment of the present invention, the delivery pump 11 can be a micro liquid pump, wherein the micro liquid pump can be a diaphragm vacuum liquid pump, which transfers liquid by changing the pump chamber volume through the reciprocating motion of the diaphragm.

[0106] In an embodiment of the present invention, the micro liquid pump has dimensions of 5cm*2.9cm*3.6cm, can be accommodated at the bottom of the storage tank 8, and transmits liquid at a flow rate of 30mL / min.

[0107] It should be noted that the term "comprising" and any variations thereof in the specification and claims of this invention are intended to cover non-exclusive inclusion, for example, including a series of components that are not necessarily limited to those explicitly listed, but may include other components that are not explicitly listed or that are inherent to the component.

[0108] In this invention, the terms "upper," "lower," "bottom," "top," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0109] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0110] Furthermore, the descriptions of "first," "second," etc., involved in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0111] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0112] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A microalgae reaction system, characterized by, The system comprises: a reaction box provided with a gas inlet and a gas outlet; a microalgae carbon fixation element placed in the reaction box; the microalgae carbon fixation element comprises a support net frame and a microalgae hydrogel layer covering the support net frame, the support net frame comprises a plurality of through-body optical fibers and is formed by interpenetrating and surrounding the plurality of through-body optical fibers; the microalgae hydrogel layer is formed on the support net frame by using a 3D bioprinting technology, and the thickness of the microalgae hydrogel layer is 1-3 mm.

2. The microalgae reaction system of claim 1, wherein, The reaction box is in the shape of a cuboid, the gas outlet is arranged on the top surface of the reaction box; the gas inlet is arranged on the side surface of the reaction box and is arranged away from the gas outlet.

3. The microalgae reaction system of claim 1, wherein, The gas outlet of the reaction box is provided with an isolation net.

4. The microalgae reaction system of claim 2, wherein, The bottom of the reaction box is provided with a communication port, or the bottom of the reaction box is open.

5. The microalgae reaction system of claim 1, wherein, A light supplementing system arranged in the reaction box is further included.

6. An indoor air purification system with emission reduction and oxygen increase functions, characterized in that, The system comprises a microalgae survival system and the microalgae reaction system according to any one of claims 1-5; wherein: The microalgae survival system comprises: a storage box for providing nutrient solution for the microalgae carbon fixation element; a reflux pool arranged between the reaction box and the storage box, the reflux pool is arranged in communication with the reaction box and is used for recycling residual liquid; the reflux pool and the storage box are arranged in communication.

7. The indoor air purification system with emission reduction and oxygen increase functions according to claim 6, characterized in that, The storage box is provided with a detachable filter element, the inside of the storage box is divided into a first storage cavity and a second storage cavity by the filter element, the bottom of the first storage cavity is arranged horizontally, and the bottom of the second storage cavity is arranged inclinedly relative to the bottom of the first storage cavity; The first storage cavity is used for storing nutrient solution, and the second storage cavity is in communication with the reflux pool.

8. The indoor air purification system with emission reduction and oxygen increase functions according to claim 7, wherein, The inclination angle of the second storage cavity gradually increases from one end close to the filter element to one end away from the filter element.

9. The indoor air purification system with emission reduction and oxygen increase functions according to claim 7, wherein, The first storage cavity is provided with a delivery pump and a timer in control connection with the delivery pump; The delivery pump is externally connected with a rotating spray head for uniformly spraying nutrient solution.

10. The indoor air purification system with emission reduction and oxygen increase functions according to claim 7, wherein, The bottom of the reflux pool is in communication with the second storage cavity, and the bottom of the reflux pool is arranged inclinedly, and the inclination angle relative to the horizontal plane gradually increases from the communication position to one end away from the second storage cavity.

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