A floating microalgae cultivation system

Abstract

The present invention relates to a floating microalgae cultivation system, comprising a cultivation unit, a buffer unit, a circulation unit and an aeration unit. The cultivation unit comprises a plurality of flexible transparent drums arranged approximately horizontally for containing culture liquid and microalgae, a first pad is arranged at the lower side of the inlet end of each flexible transparent drum, a second pad is arranged at the lower side of the outlet end, the first pad is higher than the second pad, and a disturbance device is arranged between the first pad and the second pad; the buffer unit comprises a container, the container is used to receive the culture liquid and microalgae discharged from the outlet end of the flexible transparent drum; the circulation unit is used to transport the culture liquid and microalgae from the buffer unit to the inlet end of the flexible transparent drum; the aeration unit is used to input a preset gas into the culture liquid.

Description

Technical Field

[0001] The invention relates to the field of microalgae cultivation, and in particular to a system for cultivating microalgae by using a "floating method". Background Art

[0002] Microalgae is the oldest organism on earth and one of the most important organisms on earth. It fixes 40% of the carbon dioxide on earth. Microalgae grows rapidly, has high photosynthetic efficiency, is rich in protein, oil and other nutrients, and can be used for health products, bait and feed for aquatic products, and can also be used for water pollution control. Through large-scale cultivation of microalgae, it is expected to gradually ease my country's dependence on imports of oil, soybeans, fish meal feed, etc., and also help reduce carbon emissions.

[0003] At present, there are two main methods for large-scale cultivation of microalgae. One is closed cultivation, which is cultivated under basically artificially controlled temperature, light intensity, photoperiod and circulation conditions. There are various photobioreactors such as flat plate, inclined type and vertical type. The advantages of closed cultivation are relatively stable production and high production efficiency per unit area. The disadvantages are high cost and difficulty in management. It can generally only be used in the field of nutritional health products or extraction of effective ingredients. The other is outdoor open cultivation, which generally uses elliptical or circular runway pools. Its advantages are low cost and easy management. The disadvantages are that it is easily affected by environmental factors, water evaporates a lot, and the quality of microalgae produced is low. In addition, heterotrophic cultivation of microalgae can also be carried out by learning from the fermentation tank model of industrial microorganisms, that is, using sterile culture medium and control conditions, artificially adding carbon sources to cultivate microalgae. Its advantages are that the growth conditions of microalgae can be precisely controlled and the yield is high. The disadvantages are that the fermentation tank is expensive, the culture medium cost is high, and the operation and management technology requirements are also high.

[0004] In the 1960s, Czech scientists proposed a shallow culture method, which mainly involves growing algae on an inclined table. The thickness of the culture solution is only a few millimeters, so that the microalgae can easily receive light, increase the density of the microalgae, reduce the cost of harvesting, and achieve 2,000 square meters of microalgae cultivation. However, due to its high construction cost, strong technical requirements for the inclined table, and no significant increase in total output, it has not been promoted and applied. Utility model patent CN203530295U discloses a thin-layer culture multi-production system, in which the thin-layer culture system has a flexible transparent bottom surface made of shed film, building film or geomembrane, etc., with overflow weirs on both sides of the bottom surface, and a cover film with light-transmitting properties can be set. The cover film is lowered or retracted by a transmission device, and when lowered, it forms a detachable closed or semi-closed cavity with the bottom surface, which is used to contain the culture solution and microalgae. A mixing-promoting structure is also provided on the bottom surface to form turbulence in the culture thin layer, which is convenient for the longitudinal mixing of the algae liquid and improves the utilization rate of light. In addition, there are buffer tanks for receiving the algae liquid, water pumps and pipelines constituting the circulation system, and the algae liquid is transported from the buffer tank to the bottom surface through the water pumps and pipelines to form a circulation. The system needs to be specially provided with an overflow weir, which increases the construction volume; for large-scale culture, the span of the cover film is large, and the transmission device is difficult to set up. The large-area cover film is easily affected by natural wind, and the cover film is not well fixed, and there is a risk of being blown away by the wind. At the same time, the thickness of the liquid layer in the system is difficult to adjust, and it is not convenient to adjust it in real time as the microalgae grow. In addition, in seasons not suitable for algae culture or after the culture is completed, the storage and site recovery of the system are not very convenient. Invention patent application CN102408983A discloses a bag-shaped photobioreactor, which mainly heats up an intermittent connecting line on the bag for the dispersion of aeration gas. The invention does not have a design for the liquid in the bag to flow and circulate, and the heat sealing of the plastic bag requires cumbersome manual operation, which is difficult to apply on a large scale. Invention patent application CN102260629A discloses a plate-type photobioreactor, which has the defects of many welding points, complex structure and easy breakage. As an improvement, invention patent application CN 105219616 A discloses a soft plate-type photobioreactor, which improves the anti-breakage performance of the CN102260629A patent device, but still has the disadvantages of many welding points, complex structure, great difficulty in manufacturing and high cost. Summary of the invention

[0005] The purpose of the present invention is to provide a floating microalgae cultivation system, which is easy to lay, has a good anti-weed effect, does not require additional film covering operation and fixation, and the liquid layer thickness is uniform and adjustable. When not in use, the site can be quickly restored to its original state for other uses. No complex structure is required inside, the overall cost is significantly reduced, and the technical level requirements for operators are low. The system can be used for large-scale low-cost outdoor microalgae cultivation and has great promotion and application value.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] A floating microalgae cultivation system comprises a cultivation unit, a buffer unit, a circulation unit and an aeration unit, wherein the cultivation unit comprises a plurality of flexible transparent drums arranged approximately horizontally for containing culture solution and microalgae, a first pad is arranged on the lower side of the inlet end of each flexible transparent drum, a second pad is arranged on the lower side of the outlet end, the first pad is higher than the second pad, a disturbance device is arranged between the first pad and the second pad, and the disturbance device is located below the flexible transparent drum; the buffer unit comprises a container, the container is used to receive the culture solution and microalgae discharged from the outlet end of the flexible transparent drum; the circulation unit is used to transport the culture solution and microalgae from the buffer unit to the inlet end of the flexible transparent drum; the aeration unit is used to input a preset gas into the culture solution.

[0008] Preferably, the height of the second pad is adjustable, and the disturbance device disturbs the culture solution and microalgae in the flexible transparent tube belt through height fluctuations.

[0009] Preferably, a temperature sensor and a dissolved oxygen sensor are provided in the flexible transparent tube, and the temperature sensor and the dissolved oxygen sensor are connected to a control unit, and the control unit controls the opening and closing or flow rate of the circulation unit and adjusts the height of the second pad according to the temperature signal and the dissolved oxygen signal.

[0010] Preferably, the flexible transparent tube is an agricultural plastic film tube with a thickness of less than 0.1 mm; the first pad and the second pad are pads, rectangular pads, or pads formed by stacking multiple pads, or rotatable pad rods.

[0011] Preferably, the rotatable pad rod comprises a bracket and a rotating shaft mounted on the bracket, the pad rod is fixedly arranged on the rotating shaft, and the pad rod can change the height of the outlet end of the flexible transparent tube belt covered on the pad rod when rotating with the rotating shaft.

[0012] Preferably, a plurality of the flexible transparent tubes are laid side by side on the ground plane and the roof plane, and are loaded with culture solution and microalgae after laying, the flattened width of the flexible transparent tube is 0.5-20 meters, and the thickness of the culture solution layer does not exceed 10 centimeters; the buffer unit also includes a water guide groove arranged at the outlet end of the flexible transparent tube, and the water guide groove guides the culture solution and microalgae into the container, and the container is a water tank.

[0013] Preferably, the circulation unit comprises a water pump, which is connected to the container and connected to the inlet end of the flexible transparent drum belt via a pipeline.

[0014] Preferably, the area of ​​the flexible transparent tube is greater than 10 square meters.

[0015] Preferably, the aeration unit comprises an aeration pump, and the aeration pump blows a preset gas into the flexible transparent tube belt or container through a pipeline, and the preset gas is air or a gas rich in carbon dioxide.

[0016] Preferably, the disturbance device comprises a disturbance bracket, on which a disturbance roller is mounted, and on the surface of the disturbance roller four symmetrical arc-shaped protrusions and arc-shaped grooves are sequentially arranged.

[0017] The present invention proposes a floating microalgae cultivation system, and the "floating method" is defined as a flat, open and shallow method (FOS). In the above technical solution, a closed cavity is not formed by combining a bottom surface, an overflow weir and a cover film, but a thin-layer cultivation space with two ends opened and a side wall closed is directly formed by using a flexible transparent tube belt. The agricultural plastic film tube belt can be quickly realized, and the laying is very simple. There is no need to specially construct and set up an overflow weir. The cost is significantly reduced compared with the prior art (about one-tenth of the runway pool method widely used at present), and there is no need to set up a transmission device for the cover film. Because the side wall of the tube belt is integrally formed, it has a self-fixing function and is not easily disturbed by wind, thereby improving the wind resistance of the system. By setting the first pad and the second pad and setting the height difference, the culture solution can be retained in the flexible transparent tube belt, and the thickness of the liquid layer in the tube belt can be changed by adjusting the height of the pad. When the concentration of microalgae is low and the transmittance is high in the initial stage of cultivation, the pad height can be made higher and the water layer deeper to ensure sufficient light intensity and the growth of microalgae. The deeper water layer is also conducive to temperature stability. When the concentration of microalgae increases and the transmittance is low, the pad at the outlet end can be lowered to reduce the thickness of the liquid layer, which is conducive to light transmission. The shallower water layer is conducive to the rapid rise and fall of temperature, which brings convenience to temperature regulation. Applying disturbance outside the flexible transparent tube belt can avoid setting a complex structure in the tube belt, which is conducive to simplifying the structure and reducing costs. By disturbing and making full use of the position changes in the flow of microalgae, different microalgae individuals will alternately shade each other, thereby meeting the light and dark alternation conditions required for the growth of microalgae. In a season when a round of cultivation is completed or not suitable for cultivating microalgae, such as the low temperature in the northern winter, the flexible transparent tube belt can be quickly put away and the site can be restored to its original state. From the above, it can be seen that this microalgae cultivation system has the advantages of convenient construction, low cost, high stability, and low technical threshold requirements, and can be promoted and applied outdoors on a large scale.

[0018] High cost is the bottleneck of the development of the microalgae industry, and reducing costs has been a goal pursued in this field for decades. The present invention cleverly uses low-cost agricultural plastic tube bags to prevent impurities, reduce water volatilization and temperature control, and circulate the culture solution, avoiding the work of building a platform, setting a cofferdam, and adding a cover film in the prior art, as well as the complex internal structure. It can be used for low-cost, large-area outdoor cultivation of microalgae, and the present invention can make the expansion of microalgae cultivation scale more operational. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 It is a schematic diagram of a rotating pad rod in a rotating state;

[0021] Figure 3 is a schematic diagram of another rotation state of the rotatable pad rod;

[0022] Figure 4 This is a side view of the flexible transparent drum belt in the laying state;

[0023] Figure 5 This is a schematic diagram of the system structure when a cushion block is used to support the flexible transparent drum belt;

[0024] Figure 6 is a schematic diagram of the structure of the disturbance device;

[0025] Figure 7 This is a partial photo of the initial stage of cultivating microalgae using this system;

[0026] Figure 8 This is a partial photo of the late stage of microalgae cultivation using this system. DETAILED DESCRIPTION

[0027] The present invention will be further described below in conjunction with the accompanying drawings:

[0028] As attached Figures 1 to 8As shown, the microalgae cultivation system includes a cultivation unit 1, a buffer unit 2, a circulation unit 3 and an aeration unit 4, wherein the cultivation unit 1 is one or more flexible transparent drum belts 101 laid approximately horizontally and in parallel, a first pad 103 is padded on the lower side of the inlet end 105 of the flexible transparent drum belt 101, and a second pad 102 is padded on the lower side of the outlet end 104, the first pad 103 is higher than the second pad 102, generally 5-10 cm higher, so that the two ends of the flexible transparent drum belt 101 are respectively placed on the first pad 103 and the second pad 102, and a tank chamber capable of accommodating culture solution and microalgae will be formed inside the flexible transparent drum belt 101, and the upper side wall of the flexible transparent drum belt 101 will cover the liquid surface, which not only prevents water evaporation, but also blocks dust, dirt, etc. from falling in, improves the cleanliness of the cultivation, and also has a certain air tightness, which can slow down the volatilization of carbon dioxide. The preferred flexible transparent tube is an agricultural plastic film tube, which is widely used in the agricultural field and is a very cheap and easily available agricultural material on the market. The flattened width of the agricultural plastic film tube (i.e. the width when two layers overlap and stick together) can be 0.5-20 meters, and the thickness is less than 0.1mm. The product is rolled and can be cut according to the need of the breeding length. The first pad 103 and the second pad 102 can be selected from rectangular wooden boards. During use, multiple agricultural plastic film tubes are laid in parallel on a flat ground, a roof plane, or even a floating platform built on the water surface. The first and second pads are respectively placed on both sides of the inlet end 105 and the outlet end 104, and then the culture solution and seed microalgae are placed. When the tank is filled with culture solution and microalgae, as the culture solution and microalgae continue to be added at the inlet end 105, they will flow out evenly at the outlet end 104 and be introduced into the buffer unit 2, and then transported back to the inlet end through the circulation unit 3 to form a cycle. A disturbance device 106 is also provided between the first pad 103 and the second pad 104. The disturbance device is arranged below the flexible transparent tube belt, and the liquid in the flexible transparent tube belt 101 is disturbed by the constantly changing height, thereby playing a role in stirring the culture liquid. The position of the individual microalgae cells changes up and down, and they will take turns to see the light or block each other to achieve light and dark alternation, so that the light-required conditions and light-avoiding conditions in the growth process of the microalgae can be well met. In one embodiment, the disturbance device includes a disturbance bracket 107, and a disturbance roller 108 is provided on the disturbance bracket 107. The surface of the disturbance roller 108 is provided with arc grooves and arc protrusions, and is arranged at intervals, such as symmetrically arranging two arc protrusions 109 and arc grooves 110, or symmetrically arranging three arc protrusions and arc grooves. In this way, when the disturbance roller is driven to rotate by the motor, the surface of the disturbance roller changes up and down, so that the liquid in the flexible transparent tube belt is disturbed up and down. During the culture process, air or gas rich in carbon dioxide ("rich" means that the concentration of carbon dioxide in the gas is higher than that in air) is introduced into the culture solution through the aeration unit 4 to supplement the carbon source required for the growth of microalgae.This system cleverly forms a thin layer tank chamber for accommodating culture fluid and microalgae by using a flexible transparent tube belt with an integral cylindrical side wall and matching the pads on both sides, which not only avoids the operation and transmission device of setting the cover film, but also plays the role of covering dirt and preventing water loss. At the same time, because of the cylindrical side wall of the tube belt, the system can confine the culture fluid inside the tube belt without constructing an overflow weir, which greatly simplifies the construction and saves costs. Because the tube belt is integrally formed, it also has good toughness and firmness, which can effectively prevent the disturbance of wind. The disturbance device is arranged under the flexible transparent tube belt, avoiding the cumbersome manufacturing process and the drawbacks of easy cracking of the tube belt caused by setting a complex structure in the flexible transparent tube belt. The above-mentioned disturbance device adopts the form of combining arc-shaped protrusions and arc-shaped grooves, which can not only fully disturb the liquid in the film tube belt, but also make a smooth transition to avoid scratching the film tube belt. When cultivating microalgae, the transparent tube belt can allow sunlight or artificial light to smoothly penetrate into the culture fluid and be absorbed and utilized by the microalgae, and can also maintain and appropriately raise and lower the temperature of the culture fluid to extend the season of outdoor cultivation. By using this system, the area of ​​the flexible transparent tube belt 101 can be flexibly set according to the site. It can be as small as less than one square meter, or it can be laid on several acres, dozens of acres or even hundreds of acres. Large-scale outdoor microalgae cultivation can be carried out. This technology effectively solves the disadvantages of traditional cultivation technology such as high cost and cumbersome construction, and is feasible for promotion and application.

[0029] In a preferred embodiment of the present invention, the height of the second pad 102 located at the lower side of the outlet end 104 is adjustable, and the purpose is to adjust the liquid layer thickness of the culture solution by adjusting the height of the second pad 102, so as to better meet the needs of microalgae growth. For example, as a simple and easy-to-operate embodiment, when the rectangular wooden board is used as the pad, the length direction of the wooden board is parallel to the opening direction of the tube belt, and the height and width of the wooden board are different. When the height is placed vertically on the ground and the width is placed vertically on the ground, the outlet end of the tube belt will be padded at different heights, and the liquid layer inside will have two depths. When the sun is insufficient, a liquid layer thickness with a small depth is used to facilitate the expansion of the light absorption of the liquid layer in the tube belt, so that the temperature is increased as soon as possible. When the sun is strong, a liquid layer thickness with a larger depth can be used, which is conducive to better temperature control and better maintaining the temperature of the culture solution in an appropriate range. In order to more accurately select the pad height, the second pad 102 can be composed of a plurality of shims that can be detachably combined. If the height needs to be lowered, the combination of shims is reduced, and if the height needs to be increased, the combination of shims is increased. As a more preferred embodiment, the second pad 102 of the outlet end 104 can adopt a mechanical adjustment mechanism, such as setting a rotating shaft 1022 on the bracket 1021, and fixing a pad rod 1023 parallel to the rotating shaft on the rotating shaft 1022, and the pad rod 1023 will raise the height of the outlet end 104 when the rotating shaft 1022 rotates upward. In order to improve the automation of the device, a temperature and dissolved oxygen sensor is set in the flexible transparent drum belt 101 to monitor the temperature and dissolved oxygen of the culture solution, and transmit the signal to the control unit. After receiving the signal, the control unit compares it with the preset threshold value and controls the motor to drive the rotating shaft 1022 to rotate, thereby raising or lowering the second pad 102, and can also control the opening and closing of the water pump and even the flow rate, thereby changing the thickness of the culture solution layer to better adjust the temperature and release the oxygen therein. In the above-mentioned culture process, the depth of the culture solution is generally not more than 10 cm.

[0030] In one embodiment, the buffer unit 2 includes a water guide groove 201 and a water storage groove 202. The water guide groove can also be a water guide pipe. Specifically, the water outlet end 104 of each flexible transparent tube belt 101 is connected to the water guide groove 201. The water guide groove 201 can be a water guide groove made of hard plastic material or metal, or a canal dug on the ground and treated with anti-leakage, such as adding a waterproof layer, laying an anti-seepage film in the canal, etc. The water guide groove 201 guides the received culture solution into the water storage groove 202 from one end or both ends. The water storage groove 202, as a container, can be a plastic or metal container, or a space dug downward on the ground and treated with anti-leakage. Generally, the water tank 202 is lower than the height of the flexible transparent barrel belt 101, so that the culture solution can naturally flow into the water tank by gravity, saving costs. The water tank 202 can also be higher than the flexible transparent barrel belt 101, and the culture solution is lifted from the water guide groove to the water tank by a lifting device such as a water pump. At this time, a temporary storage space for the culture solution is generally set in the water guide groove to facilitate the collection of liquid for lifting.

[0031] In one embodiment, the circulation unit 3 includes a pipeline 302 and a water pump 301. The water pump 301 can be directly placed in the water tank 202 (or connected to the water tank through a pipeline), and connected to the inlet end 105 of the flexible transparent drum 101 through the pipeline 302. Specifically, a plurality of tees 303 can be arranged on the pipeline 302, and each tee 303 opening corresponds to an opening of the flexible transparent drum 101. The culture fluid flows into the tank space of the flexible transparent drum and converges. After it is higher than the second pad 102, it flows outward into the water guide trough 201 and forms a cycle. In the case where the water tank 202 is higher than the flexible transparent drum 101, a water pump is required to lift the culture fluid in the water guide trough 201 to the water tank 202, and the distribution from the water tank 202 to each flexible transparent drum 101 only needs to be driven by pressure difference.

[0032] In one embodiment, the aeration unit 4 is an aeration pump or a steel cylinder filled with gas, which introduces air or a gas rich in carbon dioxide into the culture solution in the water tank 202 or the flexible transparent cartridge 101 to provide a carbon source for the microalgae.

[0033] Attached Figure 7 , 8 This is a photo of microalgae being cultivated using this system. Figure 7 is the initial culture state, Figure 8 This is the late stage of cultivation when microalgae grow in large quantities. From the photos, it can be seen that the system can be used to cultivate microalgae very well, with the advantages of low cost and high yield.

[0034] When using the system to culture microalgae, the type of microalgae cells is not limited, and can be any microalgae with utilization value, preferably Chlorella, Scenedesmus, diatoms, Oocystis, Chlamydomonas, etc.; the components of the culture solution used are not limited, as long as they can provide culture components for the growth of microalgae, and can be commonly used TAP culture medium, BG11 culture medium, BMM, F / 2 culture medium, etc.; the form of the light source is not limited.

[0035] It can be seen from the above embodiments that the advantages of this system include:

[0036] 1. Low construction cost:

[0037] Site: It can be idle farmland or even saline-alkali land. The site only needs to be roughly flat or partially flat, and no major changes are required to the site.

[0038] Shelf: Existing technology often requires the construction of a shelf to support the culture system. Compared with the construction of a shelf to support the culture system, digging or raising the buffer pool is much cheaper and easier to maintain.

[0039] Plastic tube bags: They are commonly used agricultural materials. They are available in various widths, thicknesses, and materials. The construction cost is much lower than the existing cultivation system. The laying of plastic bags can be done with ready-made equipment or even automated machines.

[0040] Construction time: Construction can be completed in a short time.

[0041] Restoration: After cultivation is completed, the site is easy to restore and can be used temporarily.

[0042] Agricultural plastic tube bags are factory-processed and have good light resistance, so they can be used for a long time (at least one year). Using ready-made agricultural plastic tube bags for microalgae cultivation also expands the application range of plastic tube bags. In the future, plastic tube bags can be improved on this basis to make them more suitable for the specific needs of microalgae cultivation.

[0043] Compared with the soft plate photobioreactor, because the film tube of this system does not have a complex structure inside, there are no disadvantages such as multiple welding and easy rupture, so thinner film materials can be used to reduce material costs and production process costs.

[0044] 2. Low technical threshold: The operation process of the entire device is simple, with a low technical threshold, and most people can master it with a little training.

[0045] 3. Wide scope of application: it can be built on various grounds, roofs, roads, idle land, saline-alkali land, desert land, water surface, etc., and can be used on a large scale (hundreds of acres or more).

[0046] 4. High utilization rate of natural resources: High utilization rate of light, buffer units can be used for cooling in summer, and culture units can be used for heating in winter. It has high tolerance to temperature and high utilization rate, and generally does not require additional artificial heating or cooling. Just like traditional crops, floating algae cultivation mainly relies on natural light to provide energy, which is a truly green culture.

[0047] 5. Flexible regulation: The water layer depth, flow rate, temperature, etc. of aquaculture are easy to regulate.

[0048] 6. Strong scalability: The area can be easily expanded from 1 square meter to tens of thousands of acres, and the model can be easily replicated.

[0049] 7. Not easily affected by other environmental conditions: Although it is an open system, the main parts are isolated from the outside world, external debris does not enter the culture system, and the entire system is less affected by the environment.

[0050] 8. Most of the water surface is not exposed to the air, the water evaporates less and the utilization rate of water resources is high.

[0051] 9. The plastic tube bag filled with the culture solution has the ability to self-fix and can withstand general wind and rain intrusion, and does not require additional fixing and maintenance. However, the support, fixing and daily maintenance of the culture system in the prior art all require considerable costs.

[0052] 10. Plastic tube bags can maintain a certain degree of air tightness, allowing the filled carbon dioxide to stay for a longer time, which can improve the utilization rate of carbon dioxide.

[0053] The above embodiments are merely illustrative of the concept and implementation of the present invention, and are not intended to limit the concept and implementation of the present invention. Under the concept of the present invention, technical solutions that have not been substantially changed are still within the scope of protection.

Claims

1. A floating microalgae cultivation system, comprising a cultivation unit, a buffer unit, a circulation unit and an aeration unit, characterized in that: The culture unit comprises a plurality of flexible transparent barrels arranged substantially horizontally for containing culture solution and microalgae, a first pad is provided at the lower side of the inlet end of each flexible transparent barrel, a second pad is provided at the lower side of the outlet end, the first pad is higher than the second pad, a disturbance device is provided between the first pad and the second pad, and the disturbance device is located below the flexible transparent barrel; The buffer unit comprises a container, and the container is used to receive the culture solution and microalgae discharged from the outlet end of the flexible transparent tube; The circulation unit is used to transport the culture solution and microalgae from the buffer unit to the inlet end of the flexible transparent drum belt; The aeration unit is used to input a preset gas into the culture solution; The disturbance device generates height fluctuations by rotating to disturb the culture solution and microalgae in the flexible transparent tube.

2. The floating microalgae cultivation system according to claim 1, characterized in that: The height of the second pad is adjustable.

3. The floating microalgae cultivation system according to claim 2, characterized in that: A temperature sensor and a dissolved oxygen sensor are arranged in the flexible transparent tube belt, and the temperature sensor and the dissolved oxygen sensor are connected to a control unit, and the control unit controls the opening and closing or flow rate of the circulation unit and adjusts the height of the second pad according to the temperature signal and the dissolved oxygen signal.

4. The floating microalgae cultivation system according to claim 1, characterized in that: The flexible transparent tube belt is an agricultural plastic film tube belt with a thickness of less than 0.1 mm; the first pad and the second pad are pad blocks, rectangular pads, or pads formed by stacking multiple pads, or rotatable pad rods.

5. The floating microalgae cultivation system according to claim 4, characterized in that: The rotatable pad rod comprises a bracket and a rotating shaft installed on the bracket, and the pad rod is fixedly arranged on the rotating shaft. When the pad rod rotates with the rotating shaft, the height of the outlet end of the flexible transparent tube belt covered on the pad rod can be changed.

6. The floating microalgae cultivation system according to claim 1, characterized in that: A plurality of the flexible transparent tubes are laid side by side on the ground plane, the roof plane or the floating platform on the water surface, and are filled with culture solution and microalgae after laying. The flattened width of the flexible transparent tube is 0.5-20 meters, and the thickness of the culture solution layer does not exceed 10 centimeters. The buffer unit also includes a water guide groove arranged at the outlet end of the flexible transparent tube, and the water guide groove guides the culture solution and microalgae into the container, and the container is a water tank.

7. The floating microalgae cultivation system according to claim 1, characterized in that: The circulation unit comprises a water pump, which is connected to the container and is connected to the inlet end of the flexible transparent tube belt via a pipeline.

8. The floating microalgae cultivation system according to claim 1, characterized in that: The area of ​​the flexible transparent tube is greater than 10 square meters.

9. The floating microalgae cultivation system according to claim 1, characterized in that: The aeration unit comprises an aeration pump, and the aeration pump blows a preset gas into the flexible transparent tube belt or container through a pipeline, and the preset gas is air or a gas rich in carbon dioxide.

10. The floating microalgae cultivation system according to claim 2, characterized in that: The disturbance device comprises a disturbance bracket, on which a disturbance roller is mounted, and on the surface of the disturbance roller four symmetrical arc-shaped protrusions and arc-shaped grooves are arranged in sequence.

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