CN206143216U - Microalgal culture system - Google Patents

Abstract

The utility model discloses a microalgal culture system relates to microalgal culture technical field. Can cause the cost waste, invent environmental pollution's the problem that throughput is low excessively for solving current microalgal culture system. The utility model discloses a microalgal culture system, including breeding the pond, still include bubble generator, bubble generator be used for to the micro -nano bubble of release carbon dioxide in the breed liquid in breed pond. The utility model discloses a microalgal culture system is used for breeding little algae.

Description

A kind of microalgae cultivation system

technical field

The utility model relates to the technical field of microalgae cultivation, in particular to a microalgae cultivation system.

Background technique

During the growth process, microalgae need to ingest a large amount of carbon dioxide for photosynthesis to complete their own growth and reproduction. Therefore, the microalgae culture system in the prior art usually arranges a carbon dioxide vent pipe in the culture pond to introduce carbon dioxide into the culture solution. Thereby increasing the growth rate of microalgae.

However, the above-mentioned method of introducing carbon dioxide into the culture solution makes the size of the carbon dioxide bubbles larger, so the carbon dioxide is very easy to escape, resulting in a low utilization rate of carbon dioxide. On the one hand, it causes waste of cost. As a result, the emission reduction efficiency of carbon dioxide is too low, and the ability to deal with environmental pollution is correspondingly too low.

Utility model content

The embodiment of the utility model provides a microalgae cultivation system, which can solve the problems of cost waste and low environmental pollution treatment capacity of the existing microalgae cultivation system.

In order to achieve the above object, the embodiment of the utility model provides a microalgae culture system, including a culture tank, and also includes a bubble generator, the bubble generator is used to release carbon dioxide micro-nano bubbles into the culture solution of the culture tank .

Further, the bubble generator includes an air inlet, a water inlet, and a release port, the air inlet is connected with a carbon dioxide supply unit, a water pump is provided in the culture fluid, and the water outlet of the water pump is connected with the air bubbles. connected to the water inlet of the device, and the release port is set in the culture fluid of the culture pond for releasing the carbon dioxide micro-nano bubbles.

Further, a first filter element is provided in the culture liquid, and the first filter element is used to filter algal cells and nutrient salts in the culture liquid before the culture liquid enters the water pump.

Further, the first filter element includes an algae cell filter element and a nutrient salt filter element, the culture liquid enters the water pump after passing through the algae cell filter element and the nutrient salt filter element in sequence, and the algae cell filter element The components allow the passage of nutrients in the culture solution.

Further, the algae cell filter is covered on the outside of the water pump, and there is a gap between it and the water pump.

Further, the nutrient salt filter is a semi-permeable membrane, and the semi-permeable membrane is arranged on the water pump.

Further, the microalgae culture system also includes a differential pressure sensor, the differential pressure sensor is connected to a controller, and the controller is connected to a reminder unit; the two detection ends of the differential pressure sensor are respectively located at the first One side of the filter element close to the water pump and one side away from the water pump, the detection end is used to detect the pressure on the corresponding side of the first filter element, when the first filter element is close to one side of the water pump When the pressure difference between the side and the side away from the water pump is greater than a preset pressure difference, the controller controls the reminder unit to send a reminder signal.

Further, a second filter element is provided on the connecting pipeline between the water outlet of the water pump and the water inlet of the bubble generator, and the second filter element is used to filter the culture fluid in the connecting pipeline. of solid particles are filtered.

Further, the second filter element includes a box body and a filter screen arranged in the box body, the filter screen divides the box body into two areas, and the connecting pipeline includes an outlet with the water pump. The first pipe section connected to the water port and the second pipe section connected to the water inlet of the bubble generator, the end of the first pipe section away from the water pump and the end of the second pipe section away from the bubble generator correspond one-to-one into both said areas.

Further, the distance from the release port to the bottom of the culture pond is less than or equal to 5cm.

Further, the culture pond is provided with a stirring paddle for stirring the culture liquid, and the release port is arranged on the liquid outlet side of the stirring paddle.

Further, there are multiple air bubble generators, and the release ports of the multiple air bubble generators are evenly distributed in the culture pond.

Further, a gas flow meter is provided between the carbon dioxide supply unit and the air inlet of the bubble generator.

Further, a liquid flow meter is provided between the water outlet of the water pump and the water inlet of the bubble generator.

Further, a pH detector is provided in the culture solution, and the pH detector is connected to a controller, and the controller is connected to the gas flow meter; when the pH detector detects the pH of the culture solution When the value is higher than the preset range, the controller can adjust the gas flow meter so that the flow of carbon dioxide flowing through the gas flow meter increases. When the pH detector detects that the pH of the culture fluid When the value is lower than a preset range, the controller may adjust the gas flow meter to reduce the flow rate of carbon dioxide flowing through the gas flow meter.

The microalgae culture system provided by the embodiment of the present invention includes a bubble generator, and the bubble generator is used to release micro-nano bubbles of carbon dioxide into the culture solution of the culture pond, that is, the diameter is between tens of nanometers and fifty micrometers. Therefore, the size of carbon dioxide bubbles is reduced, thereby greatly reducing the escape of carbon dioxide, thereby improving the utilization rate of carbon dioxide, saving costs on the one hand, and improving the emission reduction efficiency of carbon dioxide on the other hand. It also correspondingly improves the ability to deal with environmental pollution.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a schematic diagram of a microalgae culture system according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. example. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In describing the present invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal" , "top", "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating Or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

Fig. 1 is a specific embodiment of the microalgae culture system of the embodiment of the present invention, the microalgae culture system in the present embodiment, comprises culture pond 1, also comprises bubble generator 2, and bubble generator 2 is used for cultivating pond 1 Carbon dioxide micro-nano bubbles are released in the culture fluid.

The microalgae culture system provided by the embodiment of the present utility model includes the bubble generator 2, and the bubble generator 2 is used to release micro-nano bubbles of carbon dioxide into the culture solution of the culture pond 1, that is, the diameter is between tens of nanometers and fifty microns. Therefore, the size of carbon dioxide bubbles is reduced, thereby greatly reducing the escape of carbon dioxide, thereby improving the utilization rate of carbon dioxide, saving costs on the one hand, and improving the emission reduction efficiency of carbon dioxide on the other hand. It also correspondingly improves the ability to deal with environmental pollution.

It should be noted that the micro-nano bubbles are small in size and can reach 200nm to 4μm. They stay in the liquid for a long time, rise slowly, and escape less. In addition, the micro-nano bubbles have a large specific surface area in the liquid and can fully absorb the liquid. Dissolved into the liquid, thereby greatly reducing the escape of carbon dioxide gas and improving the utilization rate of carbon dioxide. Micro-nano bubbles have biological activity and can promote the growth of organisms.

Referring to Fig. 1, the bubble generator 2 includes an air inlet, a water inlet and a release port 21, the air inlet is connected with a carbon dioxide supply unit (not shown in the figure), the water inlet is connected with a water supply unit, and the release port 21 is arranged on the aquaculture The culture liquid in the pool 1 is used to release carbon dioxide micro-nano bubbles; the carbon dioxide in the carbon dioxide supply unit and the water in the water supply unit enter the bubble generator 2, and the bubble generator 2 can pass through the release port 21 in the culture of the culture pool 1 Carbon dioxide micronanobubbles are released in the liquid. In the present embodiment, the water supply unit is preferably a culture pond 1. At this time, a water pump 3 is provided in the culture liquid, and the water outlet of the water pump 3 is connected with the water inlet of the bubble generator 2 to pump the culture liquid in the culture pond 1. into the bubble generator 2, and the culture fluid pumped into the bubble generator 2 returns to the culture pond 1 again through the release port 21 in the form of micro-nano bubbles of carbon dioxide, so that the liquid level of the culture fluid in the culture pond 1 remains unchanged , thus ensuring the cultivation effect on microalgae.

On the basis of the foregoing embodiments, in the present embodiment, the culture liquid is provided with a first filter element 4, and the first filter element 4 is used to filter the algal cells and nutrient salts in the culture liquid before the culture liquid enters the water pump 3, This can prevent the algal cells and nutrient salts from leaving the culture pond 1 under the action of the water pump 3. On the one hand, it ensures the stability of the nutrition in the culture solution, and on the other hand, it can prevent the algal cells and nutrient salts from entering the bubble generator 2 to cause air bubbles. The device 2 is damaged, thereby prolonging the service life of the bubble generator 2, and the third aspect can prevent the algae cells from being damaged by the strong pressure of the bubble generator 2.

In one embodiment of the present utility model, the first filter element 4 only includes a nutrient salt filter element, and at this time, the nutrient salt filter element can also filter algae cells while filtering nutrient salt;

In another embodiment of the present utility model, the first filter element 4 includes an algae cell filter element 41 and a nutrient salt filter element 42, and the culture liquid enters the water pump 3 after passing through the algae cell filter element 41 and the nutrient salt filter element 42, The algal cell filter 41 allows the nutrients in the culture solution to pass through, that is, the aperture of the through hole on the algae cell filter 41 is greater than the aperture of the through hole on the nutrient filter 42. Compared with the above-mentioned embodiment, the present embodiment makes the culture solution in the The algae cells are filtered out by the algae cell filter 41 before passing through the nutrient salt filter 42 with a smaller through hole diameter, thereby reducing the possibility that the algae cells will block the nutrient salt filter 42 with a smaller through hole diameter.

Preferably, in this embodiment, the algae cell filter 41 is covered on the outside of the water pump 3, and there is a gap between the water pump 3; In this example, the filter area of the algae cell filter 41 is increased, so that the algae cells are more dispersed, thereby reducing the possibility of the algae cell filter 41 being blocked. The algae cell filter 41 in this embodiment can be a filter box that is arranged outside the water pump 3, and a through hole is opened on the box wall of the filter box, and the size of the through hole is smaller than the size of the algae cells, thereby filtering the algae cells.

Specifically, the nutrient salt filter 42 is a semi-permeable membrane, and the semi-permeable membrane is arranged on the water pump 3 , thereby avoiding additional support for supporting the semi-permeable membrane, thereby saving costs.

In order to clean the first filter 4 in time after the first filter 4 is clogged, the microalgae culture system in this embodiment also includes a differential pressure sensor (not shown in the figure), and the differential pressure sensor is connected to a controller (in the figure). not shown), the controller is connected with a reminder unit (not shown in the figure); the two detection ends of the differential pressure sensor are respectively located on the side of the first filter element 4 close to the water pump 3 and on the side away from the water pump 3, and the detection ends Used to detect the pressure on the corresponding side of the first filter 4, when the pressure difference between the side of the first filter 4 close to the water pump 3 and the side away from the water pump 3 is greater than the preset pressure difference, it means the first filter The filter 4 has been blocked, at this time, the controller controls the reminder unit to send a reminder signal, thereby reminding the user to clean the first filter 4 in time.

With the extension of the system running time, certain solid particles will accumulate in the connecting pipeline 5 between the water pump 3 and the air bubble generator 2 and the water pump 3, and these solid particles will follow the culture fluid into the air bubble generator 2 and will be charged to the air bubble generator. 2 damage, in order to avoid the above problems, the connection pipeline 5 between the water outlet of the water pump 3 and the water inlet of the bubble generator 2 is provided with a second filter 6 in this embodiment, and the second filter 6 is used for The solid particles in the culture liquid in the connecting pipeline 5 are filtered, thereby preventing the solid particles from entering the bubble generator 2 with the culture liquid, thereby avoiding the problem of causing damage to the bubble generator 2 .

Specifically, the second filter element 6 may only include a filter screen arranged in the connecting pipeline 5. Since the connecting pipeline 5 is relatively thin, the size of the filter screen is relatively small, and it is easy to be blocked; of course, the second filter element 6 also Can comprise box body 61 and the filter screen 62 that is arranged in box body 61, filter screen 62 divides box body 61 into two areas, connecting pipeline 5 comprises the first pipe section 51 that is connected with the water outlet of water pump 3 and the first pipe section 51 that is connected with air bubble The second pipe section 52 connected to the water inlet of the generator 2, the end of the first pipe section 51 away from the water pump 3 and the end of the second pipe section 52 away from the bubble generator 2 extend into two regions one by one. Large, thereby increasing the size of the filter screen 62, thereby reducing the possibility of the filter screen 62 being blocked.

The shape of casing 61 can be square, triangle, rhombus etc., preferably square, is more convenient to process; The material of casing 61 can be plastics, glass, acrylic, metal etc., preferably plastics, can reduce cost; The volume of casing 61 is 1-20m ³ , preferably 2m ³ , so that the size of the box body 61 is moderate. On the one hand, it can prevent the size of the filter 62 from being too small, and on the other hand, it can avoid the space occupied by the box body 61 from being too large. The filter screen 62 can be multi-layer or single-layer, preferably single-layer, which can reduce the cost.

The distance from the release port 21 to the bottom of the culture pond 1 is preferably less than or equal to 5cm, thereby prolonging the escape path of the carbon dioxide micro-nano bubbles, so that the carbon dioxide micro-nano bubbles are not easy to escape, that is, further reducing the escape amount of carbon dioxide , thereby further improving the utilization rate of carbon dioxide.

With reference to Fig. 1, be provided with the paddle 7 that is used to stir culture liquid in the culture pond 1, release port 21 is preferably arranged on the liquid outlet side of paddle 7, and arrow a shows in Fig. 1 the flow direction of culture liquid, thus, Under the action of the thrust of the stirring paddle 7, the micro-nano bubbles of carbon dioxide can be mixed more evenly with the culture solution, thereby facilitating the uptake of carbon dioxide by the algae cells.

There are a plurality of bubble generators 2, and the release ports 21 of a plurality of bubble generators 2 are evenly distributed in the culture pond 1, thereby increasing the supply of carbon dioxide, thereby satisfying the demand for carbon dioxide of the culture pond 1 with a larger area.

Further, a gas flow meter 8 is provided between the carbon dioxide supply unit and the air inlet of the bubble generator 2, and the gas flow meter 8 can be adjusted to change the amount of carbon dioxide entering the bubble generator 2, thereby controlling the introduction of carbon dioxide in the culture solution quantity. For example, the amount of carbon dioxide introduced can be controlled according to different time periods. Specifically, during the process of cultivating microalgae outdoors, sunlight generally acts from 8:00 am to 17:00 pm. Since the light is strongest from 10:00 am to 14:00 pm, the introduction of carbon dioxide can be increased from 10:00 am to 14:00 pm, and the introduction of carbon dioxide can be increased from 8:00 am to 10:00 am and from 14:00 pm to 17:00 pm. amount decreased.

For culture ponds 1 of different sizes, different types of bubble generators 2 are usually required. Because the water treatment capacity of different types of bubble generators 2 is different, a water pump 3 of corresponding rated power is required. In order to avoid replacing the water pump 3, the present embodiment A liquid flow meter 9 is arranged between the water outlet of the reclaimed water pump 3 and the water inlet of the bubble generator 2, and the water output of the water pump 3 can be changed by adjusting the liquid flow meter 9, so that the water output of the water pump 3 is equal to that of the air bubble generator 2. Water treatment capacity, thus avoiding the need to replace the water pump 3.

Further, a pH detector (not shown in the figure) is provided in the culture liquid, and the pH detector is connected with a controller, and the controller is connected with the gas flow meter 8; When the difference in the amount of carbon dioxide is greater than the amount of carbon dioxide required for the growth of microalgae, the pH of the culture solution will decrease. When the pH detector detects that the pH value of the culture solution is lower than the preset range, it indicates that the amount of carbon dioxide introduced is too much. , the controller can adjust the gas flow meter 8 so that the flow of carbon dioxide flowing through the gas flow meter 8 decreases, thereby reducing the amount of carbon dioxide entering the bubble generator 2, thereby reducing the amount of carbon dioxide entering the culture fluid ; During the growth and reproduction of microalgae using carbon dioxide, the carbon dioxide in the culture solution will gradually decrease, and the pH of the culture solution will gradually increase. When the pH detector detects that the pH value of the culture solution is higher than the preset range, it indicates that the carbon dioxide At this time, the controller can adjust the gas flow meter 8, so that the flow of carbon dioxide flowing through the gas flow meter 8 increases, thereby increasing the amount of carbon dioxide entering the bubble generator 2, and then increasing the flow of carbon dioxide in the culture fluid. The amount of input is increased, so that on the one hand, the normal growth of microalgae can be ensured, and on the other hand, the waste of carbon dioxide can be avoided.

Utilize the microalgae culture system provided by the embodiment of the present invention to carry out open liquid culture of microalgae:

1. Breeding parameters

Reactor: open breeding pond (take the track pond as an example)

Algae species: Microalgae strains

Initial inoculum concentration: 30～100g/m ²

Medium: conventional medium (different medium for different algae species)

2. Determination of carbon dioxide flux

Daily light energy E, unit MJ/d/m ² , light conversion efficiency η of open pond culture (1-5%, generally less than 4%, preferably calculated as 4%), determine the intake of carbon dioxide, specific calculation Proceed as follows:

Daily production of biomass (g)=E(MJ/d/m ² )×η×1000/21.7kJ/g, since 21.7kJ of energy is required to produce 1g of biomass;

The amount of carbon dioxide required per day (m ³ /m ² ) = biomass produced per day (g/m ² ) × 1.8/1000/1.98kg/m ³ , since 1.8 times of carbon dioxide is needed to produce 1g of biomass, the density of carbon dioxide is 1.98kg/ ^m3 ;

Carbon dioxide intake (m ³ /h/m ² ) = daily carbon dioxide requirement (m ³ )/day light time (h)

The amount of carbon dioxide influx must be greater than or equal to the amount of carbon dioxide influx calculated above

3. Microalgae cultivation

On the basis of the above design, it is preferable to feed carbon dioxide intermittently:

Due to the large specific surface area of the micro-nano bubbles, the solubility is more than 10 times higher than that of ordinary bubbles. Therefore, after a period of time, the micro-nano bubbles of carbon dioxide are selected to make the utilization rate of carbon dioxide in the culture fluid reach the highest state (that is, the dissolved carbon dioxide in the culture fluid accounts for The ratio of the carbon dioxide that is introduced is the highest), and then the ventilation is stopped to achieve the purpose of saving carbon sources.

When the amount of carbon dioxide introduced is 1L/s, micro-nano bubbles are used to introduce carbon dioxide into the 40L culture fluid, and the utilization rate of carbon dioxide can basically reach 90% or even 100% in 30 seconds. Then every 30L (1L/s×30s) of carbon dioxide treatment For 40L of culture liquid, 4/3L (40L/30L) of culture liquid is treated per L of carbon dioxide, so that the required amount of carbon dioxide (L) for any culture volume can be calculated, so that the utilization rate of carbon dioxide can be maximized, and then according to the flow rate of carbon dioxide Calculate the feeding time (the above-mentioned required amount of carbon dioxide/flow rate of carbon dioxide). After the gas supply is stopped, monitor the pH of the culture solution in real time (4~9, different algae strains have different pH tolerances, usually 6~8.5), and the pH of the microalgae will gradually increase during the growth process of using carbon sources , when the pH is greater than 8, it means that carbon dioxide is about to be lost at this time, and carbon dioxide is introduced again at this time, and the cycle is like this.

Experimental design: design 3 groups of experiments, experimental group 1 adopts the microalgae cultivation system provided by the embodiment of the utility model, and experimental group 2 and experimental group 3 adopt the microalgae cultivation system in the prior art. According to the maximum total light energy per day at the breeding site of 24MJ/d, the optimal light conversion efficiency is 4%, and the light is 9 hours a day, so the carbon dioxide is injected for 9 hours a day. According to the above calculation formula of carbon dioxide influx, the calculated carbon dioxide influx is 0.075L/min , so three groups of carbon dioxide influx are designed as follows:

1. Parameters

Reactor: 50m ² runway pool

Algae species: yellow silk algae

Breeding depth: 15cm

Initial inoculum concentration: 60g/m ²

Medium: BG11

Breeding days: 10d

2. Harvesting and nutrient supplementation methods:

Regularly monitor the concentration of the culture solution every day, control the concentration of the culture solution between 60 and 150g/m ² , harvest after reaching 150g/m ² , bring the concentration of the culture solution back to 60g/m ² , and supplement and harvest Collect an equivalent volume of fresh medium.

3. Calculation of carbon dioxide cost: daily carbon dioxide consumption (ton/day) x breeding days x unit price of carbon dioxide (yuan/ton)

4. Microalgae culture: conventional culture on the basis of the above design

The experimental results are shown in the table below:

name Experimental group 1 Experimental group 2 Experimental group 3 Yield (g/m ² /d) 18.75 13.62 18.35 Carbon consumption (tons) 0.0405 0.0405 0.081 CO ₂ cost (yuan) 72.9 72.9 145.8

Analysis of results:

The output of experimental group 1 (the utility model) and experimental group 3 (prior art) is basically equal, but the carbon dioxide consumption of experimental group 1 is 1/2 of experimental group 3, and the cost is reduced by half. This is due to the small size of micro-nano bubbles, slow rising speed, and not easy to overflow; and the specific surface area of micro-nano bubbles is more soluble in water, which further reduces the probability of escape.

Experimental group 2 and experimental group 3 both adopt the microalgae cultivation system in the prior art, and the bubbles are large and easy to escape. Therefore, although the supply of carbon dioxide in experimental group 2 is the same as that in experimental group 1, the output of experimental group 2 is significantly lower than that of experimental group 1 due to insufficient carbon source due to the escape of carbon dioxide.

The above is only a specific embodiment of the present utility model, but the scope of protection of the present utility model is not limited thereto. Anyone familiar with the technical field can easily think of changes or changes within the technical scope disclosed by the utility model Replacement should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims (15)

1. a kind of both culturing microalgae system, including culturing pool, it is characterised in that also including bubble generator, the bubble generator For discharging the micro-nano bubble of carbon dioxide in the culturing liquid of the culturing pool.

2. both culturing microalgae system according to claim 1, it is characterised in that the bubble generator includes air inlet, enters The mouth of a river and liberation port, the air inlet is connected with carbon dioxide and provides unit, and water pump, the water pump are provided with the culturing liquid Outlet be connected with the water inlet of the bubble generator, the liberation port is arranged in the culturing liquid of the culturing pool, uses In the micro-nano bubble of the release carbon dioxide.

3. both culturing microalgae system according to claim 2, it is characterised in that the first filtration members are provided with the culturing liquid, First filtration members were used for before the culturing liquid enters the water pump to the frustule and nutritive salt in the culturing liquid Filtered.

4. both culturing microalgae system according to claim 3, it is characterised in that first filtration members include that frustule is filtered Part and nutritive salt filtration members, the culturing liquid is passed sequentially through and enter after the frustule filtration members and the nutritive salt filtration members institute Water pump is stated, the frustule filtration members allow the nutritive salt in the culturing liquid to pass through.

5. both culturing microalgae system according to claim 4, it is characterised in that the frustule filtration members cover at the water The outside of pump, and leave gap between the water pump.

6. both culturing microalgae system according to claim 4, it is characterised in that the nutritive salt filtration members are semipermeable membrane, institute State semipermeable membrane to be arranged on the water pump.

7. both culturing microalgae system according to claim 3, it is characterised in that the both culturing microalgae system is also passed including pressure reduction Sensor, the differential pressure pickup is connected with controller, and the controller is connected with reminding unit；

Two test sides of the differential pressure pickup respectively be located at first filtration members near the side of the water pump and away from The side of the water pump, the test side is used to detect the pressure of the corresponding side of first filtration members, when the described first filtration When part is more than preset pressure difference near the side of the water pump and away from the pressure difference value of the side of the water pump, the control Device controls the reminding unit and sends alerting signal.

8. both culturing microalgae system according to claim 3, it is characterised in that the outlet of the water pump and the bubble are sent out Connecting line between the water inlet of raw device is provided with the second filtration members, and second filtration members are used in the connecting line Culturing liquid in solid particle filtered.

9. both culturing microalgae system according to claim 8, it is characterised in that second filtration members include casing and setting The casing is separated into two regions by the drainage screen in the casing, the drainage screen, and the connecting line includes and institute State first pipeline section and the second pipeline section for being connected with the water inlet of the bubble generator of the outlet connection of water pump, described the One pipeline section away from the water pump one end and second pipeline section away from the bubble generator one end correspond stretch into two The individual region.

10. both culturing microalgae system according to claim 2, it is characterised in that the liberation port is to the culturing pool bottom of pond Distance be less than or equal to 5cm.

11. both culturing microalgae systems according to claim 2, it is characterised in that be provided with for stirring in the culturing pool The stirring paddle of culturing liquid is stated, the liberation port is arranged at the tapping side of the stirring paddle.

12. both culturing microalgae systems according to claim 2, it is characterised in that the bubble generator is multiple, Duo Gesuo The liberation port for stating bubble generator is uniformly distributed in the culturing pool.

13. both culturing microalgae systems according to claim 2, it is characterised in that the carbon dioxide provides unit and described Gas flowmeter is provided between the air inlet of bubble generator.

14. both culturing microalgae systems according to claim 2, it is characterised in that the outlet of the water pump and the bubble Fluid flowmeter is provided between the water inlet of generator.

15. both culturing microalgae systems according to claim 13, it is characterised in that PH detectors are provided with the culturing liquid, The PH detectors are connected with controller, and the controller is connected with the gas flowmeter；

When the pH value that the PH detectors detect the culturing liquid is higher than preset range, gas described in the controller scalable Flowmeter body, to flow through the flow increase of the carbon dioxide of the gas flowmeter, when the PH detectors detect it is described When the pH value of culturing liquid is less than preset range, gas flowmeter described in the controller scalable, to flow through the gas stream The flow of the carbon dioxide of gauge reduces.