CN204874506U - Utilize microbubble to last gather little algae farming systems in runway pond of frustule of air supporting - Google Patents

Abstract

The utility model discloses a raceway pool microalgae culture system which utilizes micro-bubbles to continuously flotation to harvest algae cells. , baffle device, double paddle wheel and the groove structure under it. The utility model has the following advantages: (1) It can accelerate the water circulation in the raceway pool and increase the gas exchange frequency between the liquid surface and the atmosphere. (2) It can realize the initial concentration of algae cells in real time and effectively, improve the centrifugation efficiency, reduce centrifugation energy consumption, and reduce harvesting costs. (3) It can prevent the scattered carbon dioxide from escaping, improve the utilization rate of carbon dioxide, and adjust the pH of the algae liquid more quickly. (4) It can effectively promote the exchange between the upper and lower layers of the algal liquid, which can not only prevent the algal cells on the surface from being damaged by light, but also increase the total amount of effective light energy received by the algal cells per unit water body. (5) The raceway pool can realize the continuous cultivation of microalgae, and the very small amount of wastewater generated during the cultivation process can be led to the disinfection pool and nutrient salt blending pool through pipelines for treatment and recycling.

Description

A raceway pond microalgae culture system that uses microbubbles to continuously harvest algae cells

technical field

The utility model relates to a raceway pond microalgae culture system which utilizes microbubbles to continuously harvest algae cells, in particular to a raceway pond for microalgae cultivation on a large scale, and belongs to the field of microalgae cultivation engineering.

Background technique

Microalgae are the most important primary producers of natural water bodies, and the CO2 fixed by them accounts for more than 40% of the global CO2 fixation. At the same time, microalgal cells are rich in polyunsaturated fatty acids, various essential amino acids, active polysaccharides, pigments and other high value-added bioactive substances, making them of great application value in the fields of functional food, cosmetics, medicine and fine chemicals. In recent years, with the acceleration of the global industrialization process, the demand for energy has been increasing, while the traditional fossil energy is non-renewable, and the reserves are decreasing day by day. Researching and developing a kind of renewable and environment-friendly energy to meet the energy demand of human beings and reduce the damage to the environment is a major issue facing human beings to be solved urgently. Microalgae have a series of characteristics such as fast growth rate, high oil content, and short cultivation period, making them the most important bioenergy candidate species.

Due to the advantages of low cost and easy operation, the open track pool is widely used in the large-scale cultivation of various microalgae (Chlorella, Nannochloropsis, Spirulina, etc.). Because microalgae photosynthesis requires light energy and carbon dioxide; therefore, in the process of microalgae cultivation, improving the utilization rate of carbon dioxide and the total amount of light energy received by algal cells in a unit of water will help to improve the production of microalgae culture. Rate. The way to harvest microalgae, except for spirulina, most other microalgae are mainly collected by centrifugation. The operation of centrifuges consumes a lot of energy; therefore, the cost of centrifuge harvesting accounts for a very high proportion of the cost of microalgae cultivation. Improving centrifugation efficiency and reducing harvesting costs can greatly reduce the cost of microalgae cultivation.

During the cultivation of microalgae, as the cell density increases, the light penetration distance can be as low as about 1 mm. This means that in a unit of water, only a very small number of cells on the surface can obtain enough light energy. In the process of photosynthesis, microalgae need light only in the dark reaction stage. Even continuous light can cause some damage to microalgae. For the growth of microalgae, the light-dark interval (flash effect) is the best light environment; therefore, in the process of cultivating the raceway pool, it is necessary to effectively realize the frequent exchange of the upper and lower water bodies of the algae liquid, so that the algae in a unit of water body The cells not only get enough light energy, but also avoid the light damage of the surface algae cells.

Due to a series of shortcomings of the traditional raceway pool system, the density of microalgae cells cultured in it is not high enough, which directly leads to the low harvesting efficiency of the centrifuge. In order to reduce energy consumption and improve centrifugation efficiency, most manufacturers transfer the algae liquid to sedimentation tanks before harvesting microalgae. After a period of natural sedimentation, the purpose of initially concentrating microalgae is achieved. However, the efficiency of this method is relatively low, especially when dealing with some non-benthic microalgae. In addition, because most of the cells are settled in a dark environment for a long time, this process is not only easy to breed bacteria, but also causes considerable biomass loss. At the same time, the process of transferring all the algae liquid to the sedimentation tank and then transferring the upper layer of the algae liquid to the runway pond consumes a lot of energy.

When the microbubbles in the water body attach to fine particles, such as microalgae, the algae cells will be brought to the surface water body due to the buoyancy. When there are a large number of microbubbles in the algae fluid, a large number of algae cells per unit of water will be gathered on the surface. If the algae cells of a larger unit of water can be enriched to the surface layer of a smaller unit of water and collected, the initial concentration of algae cells will be realized effectively and at low cost. Thereby effectively reducing the cost of microalgae cultivation and controlling the quality of microalgae.

Utility model content

Based on a series of deficiencies of the traditional raceway pond, the utility model provides a raceway pond microalgae culture system which utilizes micro-bubbles to continuously float and harvest algae cells. In general, from improving the utilization rate of carbon dioxide, increasing the exchange frequency of the upper and lower layers of algae fluid to increase the total amount of effective light energy received by algal cells per unit of water, preventing algal cells from being damaged by light, and realizing the initial concentration of algal cells to reduce harvesting Starting from the perspective of cost, etc., the purpose of improving the efficiency of microalgae cultivation and reducing the cost of microalgae cultivation is finally achieved.

For solving the problems of the technologies described above, the technical scheme that the utility model adopts is:

The utility model provides a raceway pond microalgae culture system that utilizes micro-bubbles to continue air flotation to harvest algae cells, including a raceway pond, a turbulent carbon supplement device is installed in the raceway pond, and a device for collecting algae cells in the raceway pond by continuous air flotation using micro-bubbles , baffle device, double paddle wheel and the groove structure below;

The turbulent carbon replenishment device is used to improve the utilization rate of carbon dioxide and adjust the pH of the algae liquid more quickly;

A device for collecting algae cells in the runway pool by continuous air flotation using micro-bubbles, which is used to initially concentrate the algae liquid in the runway pool, thereby improving centrifugation efficiency and reducing centrifuge loss;

The blocking device is used to block the algae liquid in the lower layer, which can cause convection between the upper and lower layers of the algae liquid, so that the algae cells continue to roll up and down, increase the total amount of effective light energy received by a unit of water body and prevent the surface cells from being damaged by light;

The double paddle wheel system is used to increase the water flow speed and shorten the circulation time of the algae liquid; the groove under it can improve the stirring efficiency and promote the convection between the upper and lower layers of the algae liquid.

The turbulent flow carbon replenishing device provided by the utility model includes a transparent closed cover and a bottom plate, the transparent closed cover is located above the bottom plate, and the inner wall of the transparent closed cover and the bottom plate are perpendicular to the direction of water flow. The device is located on the bottom plate and in front of the water flow blocking plate, the front of the transparent sealing cover is open vertically to the water flow direction, and the transparent sealing cover is provided with sealing plates on both sides, back and top.

The transparent enclosure and the bottom plate can be fixedly connected together by a plurality of pillars, or the transparent enclosure can be fixed separately.

Preferably, there are two water flow blocking plates in the turbulent flow carbon supplementing device, the first water flow blocking plate is located on the top of the inner wall of the transparent enclosure, the second water flow blocking plate is located on the bottom plate, and the second water flow blocking plate is located on the first water flow blocking plate. the back of the board.

Preferably, in order to reduce the resistance to the water flow, the outer edge areas on both sides of the transparent enclosure can be designed with an arc-shaped or tapered "hat" structure.

Preferably, the length of the transparent enclosure is 1/20-1/5 of the length of the runway pool; the width is 1/5-1 of the width of the runway pool.

Preferably, the height of the first water flow blocking plate is 1/5-1/2 of the total height of the algae solution; the second water flow blocking plate is 1/5-1/2 of the total height of the transparent enclosure; the first and second water flow blocking The distance between the plates is 1/5-1/3 of the length of the total enclosure; the distance between the aeration device and the first water flow blocking plate is 1/5-1/3 of the length of the total transparent enclosure.

Preferably, the height of the sealing plates on both sides of the transparent sealing cover is 1/10-1/5 of the total height of the algae solution.

Preferably, the water flow blocking plate is detachably fixedly connected to the transparent enclosure and the bottom plate by bonding, rivets or screws.

The sealing cover of the turbulent flow carbon replenishing device of the utility model is completely immersed below the water surface; the aeration device releases air bubbles; after the water flow enters the area of the transparent sealing cover, the air bubbles are driven to flow forward; the air bubbles float up to the upper part of the sealing cover, and gather on the surface after being blocked; The bubbles continue to move forward with the water flow, and then dive after being blocked by the first water flow blocking plate, where the algae liquid forms the first turbulent flow, prompting the algae cells and the air bubbles to fully vortex; the water flow continues to move forward, and the water flow below encounters the second water flow blocking After the plate is blocked, it will form a second turbulent flow with the water flow mixed with air bubbles at the rear and above, which will promote the full vortex between the carbon dioxide bubbles and the algae liquid, and at the same time realize the convection between the upper and lower layers of the algae liquid; the water flow will continue to advance through the upper part of the second water flow blocking plate, The remaining carbon dioxide floats up and is blocked by the closed cover, and continues to advance in the water body; the water flow is blocked by the outer edge of the closed cover, which once again promotes the contact between the air bubbles and the water flow, and at the same time realizes the algae cells rolling up and down.

The sealing cover and the water flow blocking plate of the utility model are selected from materials with good light transmittance (glass, plexiglass, polyethylene, polyvinyl chloride, polypropylene, polyester, rubber, resin and other thin plates or films), and through bonding Or winding mold and other ways to build a sealed.

The device provided by the utility model for collecting algae cells in the runway pool by continuous air flotation using micro-bubbles is composed of a separation device and a micro-bubble generating device that separates the collection hole from other areas of the runway pool. The micro-bubble generating device and the collecting hole are located at In different areas, the microbubble generating device is set at the bottom of the runway pool.

The utility model provides a separation device, the specific structure of which is composed of an air flotation plate and a card slot. The slots are fixed on both sides of the pool wall and the pool bottom at the end of the runway pool, and the air floating plate is fixed to the semicircular area at the end of the runway pool through the card slots, thereby effectively separating a part of the area around the collection hole from other areas of the runway pool.

Preferably, the air floating plate can move up and down along the slots on the walls of the pool on both sides.

Preferably, the angle between the air floating board and the pool wall of the runway is between 10-30 degrees. Further, the included angle between the air floatation board and the pool wall of the runway is 15 degrees.

Preferably, the width of the air floatation board is 1/4-2/3 of the total width of the runway pool; the height of the air floatation board is lower than the height of the runway pool wall, and is consistent with the algae liquid level or 1-3cm higher than the algae liquid level.

Preferably, the two sides of the slot are constructed by bonding the aluminum alloy structure to the side wall of the runway pool or reserving or digging a gap on the side wall of the runway pool; the slot at the bottom of the pool is constructed by reserving or digging a gap at the bottom of the pool.

Preferably, the air floating plate is detachably connected to the slot.

Preferably, the material of the air floating plate is a thin plate of plexiglass, polyethylene, polyvinyl chloride, polypropylene, polyester, rubber, or resin with certain elasticity.

The utility model faces the direction of water flow, and fixes the air floating plate in the semicircular area at the end of the runway pool through the card slot, effectively separating the collection hole of the runway pool from other areas of the runway pool. The height of the air flotation plate is kept the same as the liquid level or slightly higher than the liquid level by 1-3cm; when the microalgae are cultivated to an appropriate density, the microbubble generator is turned on, and the microbubble generator disperses a large number of microbubbles, and the algal cells in front of the air flotation plate are affected Due to the effect of air flotation, a large amount of algae will accumulate on the surface of the water body; when the algae liquid moves to the air flotation plate, it is blocked by the air flotation plate, and the liquid level at this place will be slightly higher than the liquid level in other parts of the runway pool; the high density algae on the surface The liquid crosses the air flotation plate into the separation area and flows into the collection hole of the runway pool; through this device, the real-time and continuous preliminary concentration of the algae liquid can be realized; thereby improving the centrifugation efficiency and reducing the harvesting cost.

The device is convenient to disassemble and easy to construct.

The flow blocking device provided by the utility model is a device suitable for a microalgae runway pool and capable of blocking the algae liquid in the lower layer. Specifically, two retaining walls are built staggeredly in the middle of the runway pool. The baffle device can make the algae liquid turbulent here, promote the exchange of the upper and lower layers of the algae liquid, so that the algae cells in the lower layer under dark conditions roll to the upper layer to obtain enough light energy. The retaining wall forms an angle of 15-30o with the middle partition wall and the side wall respectively; the height is 3-10cm; a slope of 30-45o is built facing the direction of the water flow to reduce the resistance encountered when the water flows through the retaining wall.

The length of the retaining wall is determined according to its angle with the pool wall of the runway pool. Preferably, the vertical distance between the proximal ends of the two retaining walls is 1/5-1/3 of the width of the runway pool.

The double paddle wheel device provided by the utility model is specifically a device installed at both ends of the microalgae runway pool, which can stir the algae liquid and push the algae liquid forward. The double paddle wheel system can more effectively push the algae liquid forward, accelerate the circulation of the algae liquid in the runway pool; shorten the time required for the exchange of the upper and lower layers of the algae liquid, promote the gas exchange between the surface layer of the algae liquid and the atmosphere, and make more algae cells Obtain enough light energy to improve the efficiency of microalgae cultivation. The groove under the paddle wheel makes the algae liquid generate an upward recoil here, which helps to realize the convection of the upper and lower layers of the algae liquid.

Preferably, the concave surface of the groove is arc-shaped, the span is 2-4 times the width of the paddle wheel, and the deepest part is 10-20cm.

Further, the span of the groove is 3 times of the width of the paddle wheel, and the deepest part is 15cm.

The double paddle wheels are located at both ends of the diagonal line of the runway pool; the double paddle wheels operate at the same time, which can more effectively promote the advancement of the algae liquid and accelerate the circulation of the water body.

Compared with the existing single paddle wheel raceway pool system, the utility model has the following advantages: (1) It can accelerate the water circulation in the raceway pool and increase the exchange frequency between the liquid surface and the atmosphere. (2) It can realize the initial concentration of algae cells in real time and effectively, improve the centrifugation efficiency, reduce the energy consumption of centrifugation, and reduce the cost of harvesting. (3) It can prevent the scattered carbon dioxide from escaping, improve the utilization rate of carbon dioxide, and adjust the pH of the algae liquid more quickly. (4) It can effectively promote the exchange between the upper and lower layers of the algal liquid, which can not only prevent the algal cells on the surface from being damaged by light, but also enable more algal cells to obtain sufficient light energy and improve the overall photosynthetic efficiency. (5) The raceway pool can realize the continuous cultivation of microalgae, and the very small amount of waste water generated during the cultivation process can be accumulated in the sedimentation tank, pumped into the water treatment pool for treatment, and then replenished to the raceway pool, so as to realize the nutrient salt and water pollution. recycling. (6) The device involved in the utility model is low in cost, easy to manufacture, and high in efficiency, which helps reduce the cost of large-scale cultivation of microalgae.

Description of drawings

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described in further detail.

Fig. 1 is a schematic structural view of the transparent enclosure of the present invention.

Fig. 2 is a schematic diagram of Embodiment 2 of the transparent sealing cover of the present invention.

Fig. 3 is a structural schematic diagram of the micro-bubble air flotation harvesting algae cell device of the present utility model.

Fig. 4 is a schematic bird's-eye view of the raceway pool of the present invention.

Fig. 5 is the groove structure of Embodiment 3 of the present utility model.

In the figure, 1 transparent sealing cover, 2 first water flow blocking plate, 3 second water flow blocking plate, 4 aeration device, 5 bottom plate, 6 closing plate, 7 air floating plate, 8 card slot, 9 aeration device, 10 runway Pool, 11 algae liquid level, 12 turbulent flow carbon replenishing device, 13 flow blocking device, 14 double paddle wheel device, 15 collecting holes, 16 grooves. The arrows in the figure represent the direction of water flow.

Detailed ways

Example 1

As shown in Figures 1, 3, and 4, the runway pool microalgae culture system that utilizes microbubbles to continuously harvest algae cells provided by the present embodiment includes a runway pool. The device for floating and collecting algae cells in the runway pool, the flow blocking device, the double paddle wheel and the groove structure below.

The turbulent flow carbon replenishment device for the microalgae runway pool provided in this embodiment includes a transparent sealing cover and a base plate, the transparent sealing cover is located above the base plate, and a water flow blocking plate is arranged on the inner wall and the bottom plate of the transparent sealing cover perpendicular to the direction of water flow, the water flow blocking plate and the exposure plate. An aeration device, the aeration device is located on the bottom plate and in front of the water flow blocking plate, the front of the transparent closed cover is open in the direction of the vertical water flow, and the transparent closed cover is provided with closed plates on both sides, the back and the top.

The transparent enclosure and the bottom plate are fixedly connected together by four pillars.

In this embodiment, there are two water flow blocking plates, the first water flow blocking plate is located at the top of the inner wall of the transparent enclosure, the second water flow blocking plate is located on the bottom plate, and the second water flow blocking plate is located behind the first water flow blocking plate.

In order to reduce the resistance to the water flow, the outer edge areas on both sides of the transparent enclosure are designed with an arc-shaped "hat" structure.

The length of the transparent enclosure is 1/10 of the length of the runway pool; the width is 1/3 of the width of the runway pool.

The height of the first water flow blocking plate is 1/3 of the total height of the algae liquid; the second water flow blocking plate is 1/3 of the total height of the transparent enclosure; the distance between the first and second water flow blocking plate is the length of the total enclosure 1/4; the distance between the aeration device and the first water flow blocking plate is 1/4 of the total length of the transparent enclosure.

The height of the sealing plates on both sides of the transparent sealing cover is 1/7 of the total height of the algae liquid.

The water flow blocking plate is detachably fixedly connected with the transparent closing cover and the bottom plate through bonding, rivets or screws.

When in use, after the device is immersed in water, the water flow will drive the air bubbles dispersed by the aeration device to flow forward, and the air bubbles will flow forward and float upward at the same time; they will encounter the blocking of the first water flow blocking plate and the upper part of the sealing cover respectively; Turbulence is formed here, and the algae liquid and carbon dioxide bubbles are fully vortexed; the algae liquid and air bubbles continue to flow forward through the gap between the first water flow blocking plate and the bottom of the runway pool. After being blocked by the second water flow blocking plate, turbulence will be formed again behind the blocking plate and above the corresponding sealing cover, which can promote the full contact between the algae liquid and the air bubbles, and promote the further dissolution of carbon dioxide; The outer edge of the cover is blocked, and after the water flow forms the third turbulent flow, the algae liquid is in full contact with the air bubbles again. At the same time, the multiple turbulent flows formed in this process also effectively make the algae liquid convect between the upper and lower layers, promote the up and down tumbling of the microalgae cells, and make more algae cells in the unit water body obtain enough light energy.

The device provided in this embodiment to collect algae cells in the runway pond by continuous air flotation using microbubbles is composed of a separation device and a microbubble generating device that separates the collection hole from other areas of the runway pond. The microbubble generating device and the collection hole are located at In different areas, the microbubble generating device is set at the bottom of the runway pool.

The specific structure of the separation device is: it consists of an air flotation board and a card slot. The card slot is set on both sides of the end of the runway pool and the bottom of the pool. The two sides and the lower side of the air flotation board are fixed on both sides of the end of the runway pool through the card slot. On the pool wall and pool bottom, the air floating plate is fixed to the semicircular area at the end of the runway pool through the card slot, thereby effectively separating a part of the area around the collection hole from other areas of the runway pool.

The air floating board can move up and down along the slots on the pool walls on both sides. The angle between the air floatation board and the pool wall of the runway is 15 degrees.

The width of the air flotation board is 1/3 of the total width of the runway pool; the height of the air flotation board is lower than the height of the runway pool wall and 2cm higher than the algae liquid level.

The two sides of the card slot are bonded to the side wall of the runway pool by bonding the aluminum alloy structure; the card slot at the bottom of the pool is constructed by reserving a gap at the bottom of the pool. The air floating board is detachably connected with the card slot.

The material of the air floating plate is a thin organic glass plate with certain elasticity.

The baffle device provided in this embodiment is a device suitable for the microalgae runway pool and capable of blocking the algae liquid in the lower layer. Specifically, two retaining walls are built in the middle of the runway pool. The baffle device can make the algae liquid turbulent here, promote the exchange of the upper and lower layers of the algae liquid, so that the algae cells in the lower layer under dark conditions can roll to the upper layer to obtain enough light energy. The retaining wall forms an angle of 20o with the middle partition wall and the side wall respectively; the height is 6cm; a slope with a slope of 40o is built facing the direction of the water flow to reduce the resistance encountered when the water flows through the retaining wall. The vertical distance between the near ends of the two retaining walls is 1/4 of the width of the runway pool.

The double paddle wheel device provided in this embodiment is specifically a device installed at both ends of the microalgae runway pool that can stir the algae liquid and push the algae liquid forward. The double paddle wheel system can more effectively push the algae liquid forward, accelerate the circulation of the algae liquid in the runway pool; shorten the time required for the exchange of the upper and lower layers of the algae liquid, promote the gas exchange between the surface layer of the algae liquid and the atmosphere, and make more algae cells Obtain enough light energy to improve the efficiency of microalgae cultivation.

The double paddle wheels are located at both ends of the diagonal line of the runway pool; the double paddle wheels operate at the same time, which can more effectively promote the advancement of the algae liquid and accelerate the circulation of the water body.

Example 2

As shown in FIG. 2 , the difference between the new gas supply device for the microalgae runway pool provided by this embodiment and that of Embodiment 1 is that the transparent enclosure and the bottom plate are fixedly connected together by two pillars.

Example 3

As shown in Figure 5, the difference between this embodiment and the previous embodiments is that a groove structure is set under the paddle wheel, which can make the stirred algae liquid form an upward recoil force there, thus helping to realize the algae liquid upper and lower layer convection. The concave surface of the groove is arc-shaped, the span is 3 times of the width of the paddle wheel impeller, and the deepest part is 15cm.

Claims (8)

1. the raceway pond microalgae cultivating system utilizing microbubble to continue aerating collecting frustule, it is characterized in that, the groove structure comprise raceway pond, establish turbulent flow carbon compensator in raceway pond, utilizing microbubble to continue air supporting to collect the device of raceway pond frustule, baffle device, two paddle wheel and divide into;

Turbulent flow carbon compensator is for improving the utilization ratio of carbonic acid gas and regulating algae liquid PH;

The device utilizing microbubble to continue air supporting collection raceway pond frustule is made up of the separating device other region separation of collection hole and raceway pond opened and micro bubble generation device, and micro bubble generation device and collection hole are positioned at different regions; Baffle device is used for producing lower floor's algae liquid stopping, can promote the convection current of algae liquid levels, cause the rolling up and down of frustule, improve effective luminous energy total amount that unit of water body receives;

Two paddle wheel, for increasing flow velocity, shortens algae liquid cycling time; The groove of below, can make the algae liquid be stirred form jet power upwards herein, promotes the convection current between algae liquid levels.

2. both culturing microalgae system according to claim 1, it is characterized in that, described turbulent flow carbon compensator comprises transparent confinement cover and base plate, transparent confinement cover is positioned at above base plate, transparent confinement cover inwall and base plate arrange water blockage plate perpendicular to water (flow) direction, water blockage plate and aerating apparatus, aerating apparatus to be positioned on base plate and before water blockage plate, the front openings of Transverse to the flow direction in described transparent confinement cover, transparent confinement cover both sides, is provided with closure plate with top below.

3. both culturing microalgae system according to claim 1, is characterized in that, described baffle device, specifically: in raceway pond mid-way, interlocks and builds many choking walls; Choking wall becomes 15-30o angle with middle dividing wall with side wall respectively; Be highly 3-10cm; Building the gradient towards water (flow) direction is 30-45o slope.

4. both culturing microalgae system according to claim 1, is characterized in that, described two paddle wheel devices, specifically a kind of device that can stir the advance of algae liquid promotion algae liquid being installed on micro-algae raceway pond two ends, and two paddle wheel is positioned at the diagonal lines two ends of raceway pond; Groove structure is established below paddle wheel.

5. both culturing microalgae system according to claim 2, it is characterized in that, water blockage plate is provided with two pieces, and the first water blockage plate is positioned at transparent confinement cover inwall top, second water blockage plate is positioned on base plate, and the second water blockage plate is positioned at after the first water blockage plate.

6. both culturing microalgae system according to claim 1, it is characterized in that, described separating device is made up of air supporting plate and draw-in groove, at the bottom of the both sides pool wall that draw-in groove is arranged on raceway pond end and pond, at the bottom of the both sides pool wall that raceway pond end is fixed on by draw-in groove in air supporting plate both sides and downside and pond, by draw-in groove, air supporting plate is fixed on raceway pond end semicircular area, thus other region of a part of region around collection hole and raceway pond is effectively separated.

7. both culturing microalgae system according to claim 6, is characterized in that, air supporting plate can move up and down along the draw-in groove on the pool wall of both sides.

8. both culturing microalgae system according to claim 6, is characterized in that, the angle of air supporting plate and runway pool wall is between 10-30 degree.