JP2003199455A - Method and apparatus for growing microalgae - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for growing microalgae capable of continuously producing a large amount of microalgae extremely efficiently and stably with simple equipment installed outdoors, and a method for growing the microalgae. A breeding device for use is provided. SOLUTION: This is an apparatus which is installed outdoors and continuously proliferates microalgae, comprising a water tank 6 formed of a transparent material, a filtered seawater supply means 2, a control device 1, a water temperature control means 3, And the filtered seawater supply means 2 comprises:
Under the control of the control device 1, the seawater in the water tank containing the microalgae grown in the water tank 6 has a seawater filtration tank 7, a filtered seawater tank 8, and a water pipe 9. In addition to being configured to be transported to the outside, filtered water is automatically refilled into the water tank 6 in accordance with the amount of seawater taken out of the water tank.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the production of bivalves such as clams, clams, pearl oysters and oysters, and seedlings of crustaceans such as prawns and clams, and pearl oysters.
In cultivating oysters, scallops, etc., a method of growing and culturing a large amount of microalgae used as a feed outdoors, and
The present invention relates to a breeding device used in the method.

[0002]

2. Description of the Related Art Conventionally, in a facility that produces and cultures bivalves such as clams, clams and pearl oysters,
Microalgae (ketoceras, pavlova, isochrysis, etc.) supplied as a feed are grown and cultured using equipment installed indoors or outdoors.

When cultivating microalgae outdoors, a small amount of nutrient salts (medium or artificial seawater fortification solution) and microalgae to be cultivated are added to a transparent aquarium into which filtered seawater is introduced, and the algae are exposed to sunlight. When it is confirmed that the microalgae in the aquarium have reached a desired concentration and are sufficiently proliferated, the seawater in the aquarium containing a high concentration of the microalgae is completely used (eg, , Transfer to a water tank (cultivation tank) where seedlings and adult shellfish are bred, and empty the water tank once,
A general method is to repeat the same steps after washing (batch processing).

[0004] According to this method, since the light energy required for photosynthesis of algae can be covered by sunlight, it has an advantage that running cost can be reduced as compared with an indoor culture method which requires lighting equipment. There is.

[0005]

By the way, in order to produce seedlings such as bivalves, it is necessary to cultivate and secure a large amount of microalgae as a feed, and the adult bivalves (parent shells).
In order to cultivate them at high density,
High density and large amount of feed (microalgae etc.) is required,
Since the conventional outdoor culture method as described above is a batch process, it is difficult to continuously cultivate microalgae at high density.

[0006] Further, in the conventional outdoor culture method, when the grown microalgae are used as a feed for the object to be cultured, the feeding interval is increased (for example, about once every several days). As a result, there is a problem that the concentration deviation of the feed in the aquaculture tank becomes large before and after feeding, which may adversely affect the aquaculture target.

Therefore, rather than the conventional batch treatment, the microalgae are gradually taken out from the aquarium and used in the process of growing the microalgae in the aquarium. It is desirable to be able to feed continuously at intervals, but with the conventional outdoor culture device, the level of filtered seawater and nutrients in the aquarium will decrease with each feeding, and these will be reduced each time. If supplements and additions are required, the work will be complicated and management will be difficult. Furthermore, it is difficult to adjust the water temperature in summer when the water temperature rises.

Further, even in the case of batch processing,
If the number of aquariums can be increased, continuous feeding will be possible, but if the number of aquariums is increased, the work process will be increased accordingly, which will increase the burden on workers and There is also the problem of area restrictions.

There is also a "feed algae culture device" as described in Japanese Patent Application Laid-Open No. 11-75590, but the maintenance of the device is complicated and the multiplication efficiency is so high. Although not expensive, there is a problem that it is very expensive.

The present invention has been made to solve the above problems, and it is possible to continuously and efficiently generate a large amount (high density) of microalgae stably with a simple facility installed outdoors. It is an object of the present invention to provide a method for growing a microalgae that can be produced in any method, and a growth device used for the method.

[0011]

A device for multiplying microalgae according to the present invention is a device for continuously growing microalgae, which is a water tank formed of a transparent material that transmits sunlight. Filtered seawater supply means and a control device, wherein the filtered seawater supply means is a seawater filter tank for filtering the pumped seawater, and filtered seawater for storing the filtered seawater generated by the seawater filter tank. A tank and a water pipe for supplying filtered seawater from the filtered seawater tank to the aquarium, and under the control of the control device, the aquarium seawater containing microalgae grown in the aquarium is , Is configured to be automatically taken out of the water tank at a desired amount at a desired time, and according to the amount of seawater in the water tank taken out of the water tank,
It is characterized in that filtered seawater is automatically replenished in the water tank.

The seawater filtration tank has a filter sand and a hollow fiber membrane filter, and when the filtered seawater is replenished into the water tank by the filtration seawater supply means, the seawater is replenished according to the replenishment amount. It is preferable that the natural seawater is automatically taken in from and the filtered seawater is generated by filtering and stored in the filtered seawater tank.

Further, when nutrient salts are absorbed by the microalgae added to the aquarium and the microalgae grown in the aquarium, or the seawater in the aquarium is diluted by replenishing filtered seawater into the aquarium. However, the nutrient salt concentration in the aquarium will decrease, but if the required amount of nutrient salts is dropped into the aquarium, the decrease in the nutrient salt concentration in the aquarium can be compensated. Therefore, the microalgae can be efficiently propagated.

Further, instead of dripping the nutrient salts, a slow-acting algae growing material that gradually elutes the nutrient salts may be installed in the water tank.

Further, this microalgae growing apparatus has a water temperature control means and is configured to maintain the seawater in the aquarium at a temperature suitable for the growth of microalgae, so that the temperature rising period in summer Also in this case, the rise in water temperature in the water tank can be avoided, and the microalgae can be stably and efficiently produced.

Further, since the water tank is installed outdoors and is configured to block infrared rays or ultraviolet rays by attaching a film for blocking infrared rays or ultraviolet rays, the water temperature rise due to infrared rays and the ultraviolet rays can be prevented. It is possible to reduce the strong light inhibition of the microalgae caused by the above, and it is possible to carry out the growth and culture of the microalgae without any problem even in hot weather.

Further, when the illuminance in the water tank is lower than a predetermined level, if the illuminance is detected and the lighting is automatically turned on, it is possible to have sufficient sunlight due to rain or cloudy weather. Even when it cannot be used for a long time, or when the growth of the microalgae has progressed so that it is difficult for the sunlight to reach the inside of the aquarium, the microalgae can be preferably grown.

The method for growing microalgae according to the present invention is a method for continuously growing microalgae using the above-described microalgae growth apparatus, which can block infrared rays and / or ultraviolet rays. A transparent aquarium configured as described above is installed outdoors, while introducing filtered seawater from the filtered seawater tank into the aquarium, a small amount of microalgae is added, and from the algae growth material installed in the aquarium, microalgae of The components necessary for growth are eluted into the filtered seawater, sunlight that has passed through the transparent water tank, and by the eluted components from the algae growth material,
By activating the microalgae added to the aquarium, the microalgae are efficiently proliferated, and under the control of the control device, the aquarium seawater containing the microalgae proliferated in the aquarium has a desired time. In addition, it is configured so that the desired amount is taken out and automatically transferred to the outside of the water tank.
It is characterized in that the filtered seawater is automatically replenished in the water tank in accordance with the amount of the seawater in the water tank taken out from the water tank.

Even in this case, if the illumination installed in the water tank is automatically turned on when the illuminance in the water tank is reduced, sunlight may be generated due to rain or cloudy weather. Even when it cannot be used sufficiently, or when the growth of microalgae progresses so that it becomes difficult for sunlight to reach the inside of the aquarium, the microalgae can be properly grown.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a microalgae growing apparatus of the present invention. As shown in the figure, this microalgae growing device basically comprises a control device 1, a filtered seawater supply means 2, a water temperature control means 3, a lighting means 4, a stirring means 5, and a water tank 6.

The filtered seawater supply means 2 includes a seawater filter tank 7 for removing unnecessary components from the pumped seawater, and a filtered seawater tank for storing the seawater filtered by the seawater filter tank 7. 8 and a water supply pipe 9 and a water supply pump 19 for sending the filtered seawater from the filtered seawater tank 8 to the water tank 6. Also, the water temperature control means 3
Is composed of, for example, a heat exchange type stationary throw-in type, a stationary chiller type cooling device, or the like.
It is composed of an underwater fluorescent lamp 10 installed in the water tank 6 and a power source 11 for supplying electric power to the underwater fluorescent lamp 10.

The stirring means 5 is for stirring the filtered seawater introduced into the water tank 6, and in the present embodiment, an air stone 12 installed in the water tank 6 and air to the air stone 12. Pump 13 for sending air under pressure
It is composed of and.

The water tank 6 is composed of a main body and a lid 18, both of which are molded of transparent resin. Then, as shown in FIG. 2, a transparent film 14 for cutting infrared rays and ultraviolet rays is attached to the outer periphery of the side surface of the main body and the upper surface of the lid 18. still,
In this embodiment, the water tank 6 having a capacity of 500 L (that is, capable of storing 500 L of the filtered seawater 16 etc.) is used.

Further, as shown in FIG. 2, the water tank 6
An algae breeding material 15 is arranged inside. The algae growth material 15 supplies components necessary for the growth of microalgae such as diatoms (nutritional components such as silicon, iron and phosphorus) into the filtered seawater 16 and, as shown in the figure, reticulate. It is preferable to immerse it in the filtered seawater 16 in the state of being stored in the bag or in the basket.

Examples of the algae breeding material 15 include, for example, JP-A-6-335330, JP-A-9-172890,
JP-A-10-42741, JP-A-10-94341
No. 2000-300107, 2001-25
Although various materials for growing algae such as those described in 8420 and WO98 / 24298 can be used, in the present embodiment, ion culture S (trade name), ion culture P (trade name), Ion culture F (trade name) and nitrogen fertilizer are used as the algae growth material 15. (“Aeon Culture” is a registered trademark owned by Tetra Co., Ltd.)

The components of the ion cultures S, P and F are as follows.

[0027]

[Table 1]

The addition amount of these is 500 L
It is preferable to use 300 g (± 150 g) of ion culture S and 300 g (± 150 g) of ion culture P, 150 g (± 150 g) of ion culture P, and 300 g (± 150 g) of nitrogen fertilizer for each of the six water tanks.

When the amount of the algae growing material 15 added is as described above, the nutrient concentration in the water tank 6 is approximately as follows. Silicon [SiO ₂ ] 30 to 100 μM / L Phosphorus [PO ₄ ] 2 to 10 μM / L Nitrogen [NO ₂ + NO ₃ ] 50 to 150 μM / L

Here, an example of a method for growing microalgae (diatom) using the microalgae growing apparatus shown in FIGS. 1 and 2 will be described. First, as a preparatory work, a seawater filtration work is performed. The filtration work is performed by filtering seawater pumped up from the sea by means of a seawater filtration tank 7 having a sand and hollow fiber membrane filter, and the generated filtered seawater 16
Is stored in the filtered seawater tank 8.

Next, a water tank 6 as shown in FIG. 2 is installed outdoors, and 50 L of a culture solution containing a high concentration of diatom in it.
(˜100 L) is introduced, and 450 L (˜400 L) of filtered seawater 16 is introduced from the filtered seawater tank 8 through the water feeding pipe 9 by a water pump (not shown).

The diatom in the culture solution introduced into the water tank 6 is preliminarily cultured in an indoor culture facility until the amount of chlorophyll a reaches a concentration of about 800 μg / L. When 50 L of diatom culture solution with an amount of chlorophyll a of 800 μg / L and 450 L of filtered seawater 16 are introduced into the aquarium 6, the diatom culture solution is 10
Since the water is diluted twice, the diatom concentration in the entire water tank 6 is that the amount of chlorophyll a is 80 μg / L. Further, a transparent resin lid 18 is placed on the water tank 6 so as to prevent foreign matter from entering.

The filtered seawater 16 and the like introduced into the water tank 6 are
The water temperature control means 3 maintains the most suitable water temperature (optimum water temperature) when the target microalgae grow. still,
Since the optimum water temperature differs depending on the type of target microalgae, the operator needs to adjust the set temperature of the water temperature control means 3 according to the type of microalgae to be used.
For example, the temperature is set to 25 ° C. (± 2 ° C.) when using Skeletonema costatum, and to 30 ° C. (± 2 ° C.) when using a thermotolerant strain of Quitoceras gracilis.

Since this water tank 6 is installed outdoors, it will be directly exposed to sunlight.
A transparent film 14 is attached to the outer periphery of the side surface of the and the upper surface of the lid 18, and the film 14 can block infrared rays (wavelength 780 to 2100 nm) (cut rate 63%). The rise in water temperature due to direct sunlight is preferably avoided. Further, since this film 14 can also block ultraviolet rays (wavelength 340 nm or less) (transmittance 1% or less), it is possible to prevent adverse effects on algae due to the bactericidal action of ultraviolet rays.
It should be noted that algae mainly grow by utilizing light having a wavelength of 400 to 700 nm.

An algae breeding material 15 is placed in the water tank 6, and components (silicon or the like) necessary for breeding continue to be eluted from the algae breeding material 15 into the filtered seawater 16. It should be noted that if elution components such as silicon or microalgae are unevenly distributed in any part of the aquarium 6, it is possible that the growth efficiency is reduced. However, in the present embodiment, An air stone 12 is installed in the water tank 6, and by continuously discharging the air pumped from the air pump 13 from this air stone 12 (aeration), convection can be generated in the filtered seawater 16. Thereby, the inside of the water tank 6 can be stirred. As a result, microalgae and algae growth material 15
The components eluted from the can be distributed in the water tank 6 at a uniform concentration, and the light can be evenly applied to the microalgae, so that it is possible to prevent the growth efficiency from being lowered due to uneven distribution.

As described above, the water tank 6 has an extremely good growth environment, and the diatoms put into the water tank 6 repeatedly actively grow and increase the number of individuals in a short period of time. become. Specifically, two days after the diatom and the filtered seawater 16 are introduced into the water tank 6, the inside of the water tank 6 grows so deeply that it is dyed brown.

When the growth of microalgae in the water tank 6 progresses to a high density, it becomes difficult for sunlight to reach the inside of the water tank 6 (decrease in illuminance). If this happens, the momentum of photosynthesis in the microalgae will decrease, and the growth efficiency will also decrease, so in this microalgae growth apparatus, the growth of the added microalgae proceeds to some extent, and the illuminance decreases. In the case where it has been used or when the sunlight cannot be fully used due to rain, cloudy weather, etc., a sensor (not shown) detects this and the underwater fluorescent lamp 10 installed in the water tank 6 automatically It is configured to be turned on, so that a decrease in photosynthesis due to a decrease in the illuminance of sunlight and a decrease in the growth efficiency of microalgae can be suitably prevented.

According to the method described above, it is possible to extremely efficiently grow a large amount of microalgae.
More specifically, first, diatom (amount of chlorophyll a: 800 μg / L) was added into the water tank 6, and this was added to the filtered seawater 16
At the time of 10-fold dilution with, the concentration of diatoms in the water tank 6 is 80% as described above.
μg / L (160μg / L when diluted 5 times)
However, in the case of the diatom Skeletonema costartum, the chlorophyll a amount can be grown in about 2 days until the maximum amount becomes about 1000 μg / L.
Even in the case of the diatom Quitocellus gracilis, the amount of chlorophyll a is about 2 until the maximum amount becomes about 1500 μg / L.
Can be grown in days.

By utilizing the microalgae grown in large quantities by this method as a feed, it is possible to preferably carry out feeding culture for bivalves and the like. More specifically, if it is configured to be able to supply the propagated microalgae from the aquarium 6 to the aquaculture tank containing the bivalves or the like to be cultured by a feeding pipe, pressure feeding means, etc., Feeding can be performed smoothly and easily.

When seawater containing high density of microalgae is sucked from the water tank 6 by a feeding pipe or the like in a necessary amount and transferred to, for example, a culture tank, the water level in the water tank 6 is In this case, the microalgae growing apparatus according to the present embodiment replenishes only the filtered seawater 16 from the filtered seawater tank 8 into the aquarium 6, although the amount of water is reduced by that amount.

When only the filtered seawater 16 is replenished after sucking the microalgae and the like, the density of the microalgae in the water tank 6 will be reduced, but in the water tank 6, the algae growth material 15 is used to remove silicon. Nutrient components such as continue to elute, filtered seawater 1
Since it is continuously supplied to No. 6, microalgae are activated by the amount corresponding to the decrease in density, and actively grow. As a result, the high density state is restored again within a short period of time.

The change of the water level in the water tank 6 is measured and monitored by a water level sensor (not shown) installed in the water tank 6, and the replenishment of the filtered seawater 16 is started based on the measured value. The end is automatically controlled.

The apparatus for growing microalgae in this embodiment is
According to the configuration as described above, by using this microalgae growing apparatus, a large amount of microalgae can be continuously and repeatedly grown, and feed culture for bivalves and the like can be realized. The food required above can be fully covered.

However, when the aquarium 6 is continuously used without cleaning for a long period of time, bacteria (or other plankton) that become negative when the microalgae grow
However, after about 8 days have passed since the microalgae were added to the aquarium 6, the growth peak has passed and the activity and growth efficiency of the microalgae have decreased. Therefore, in order to efficiently grow the microalgae using this microalgae growth apparatus, after a certain period (for example, 8 days) has passed since the filtered seawater 16 and the microalgae were introduced into the water tank 6. It is preferable that the inside of the water tank 6 is emptied once, and the treatment such as washing is performed, and then the filtered seawater 16 is newly introduced, new microalgae is newly added, and the growth step is restarted.

In the case of this method, a plurality of water tanks 6 are prepared, these are divided into a plurality of groups, and the start time of the breeding process may be shifted for each group (or for each water tank 6 without grouping). For example, the microalgae can be quantitatively and continuously grown, and a large amount of microalgae can be secured.

As described above, in the present embodiment, the algae growth material is installed in the water tank as a source of nutrient salts to the microalgae. However, other methods such as a sensor or an operator may be used. By automatically or manually measuring and monitoring the nutrient salt concentration in the aquarium, and by dropping nutrient salts into the aquarium as necessary, the nutrient salt concentration in the aquarium can always be kept within a certain range. It can also be configured to.

[0047]

EXAMPLES Examples of the present invention will be shown below. In this embodiment, four water tanks having a capacity of 500 L (first to fourth water tanks)
Was used to construct a growth apparatus for microalgae, and large-scale culture of diatoms (Keatoceras gracilis) was performed. Then, the obtained diatom was supplied as feed to the pearl oysters housed in the culture tank having a capacity of 16 t.

More specifically, the four water tanks are first divided into two groups (group A: first and second tanks, group B: third and fourth tanks),
On the first day, 100 L of culture solution containing diatom at a high concentration (chlorophyll a amount of about 800 g / L) and filtered seawater 40
0 L was introduced into each set A water tank.

The diatom in the culture solution introduced into the aquarium has been previously cultivated using an indoor culture facility until the desired concentration is obtained, and the filtered seawater is the seawater pumped up. Is sand-filtered and then passed through a 1 μm hollow fiber membrane filter and a 0.45 μm hollow fiber membrane filter in that order, which has been previously produced.

In addition, a predetermined amount of algae growth material (300 g of each of ion culture S and F, 150 g of ion culture P and 300 g of nitrogen fertilizer), and one underwater fluorescent lamp (20 W) were placed in each water tank. Installed in each.

After the introduction / installation work was completed, the underwater fluorescent lamp was turned on, aeration was performed to agitate the water tank, and the diatom culture was started in the water tank of group A. The underwater fluorescent lamp was turned on and aerated only during the day, and turned off at night to stop the aeration.

In this way, diatom culture was carried out for 8 days in the water tank of group A. Then, on the ninth day, after discharging all the diatoms and seawater in the water tank and washing the water tank, the work of introducing the diatom culture solution, filtered seawater, etc., and the work of installing the algae growth material and the underwater fluorescent lamp were performed again. The diatom culture was restarted. Then, on the 17th day, the 25th day, and the 33rd day (that is, every 8 days), the same renewal work was performed to continuously culture the diatom.

In the renewal work on the 17th day and the 33rd day, the algae growing material installed in the water tank was replaced with a new one, but in the renewal work on the 9th day and the 25th day, , The algae growth material was not replaced with a new one, and the one that had been installed in the aquarium up to that point was used continuously. That is, the renewal work of the water tank was basically performed every 8 days, but the replacement of the algae growth material was performed every 16 days.

On the other hand, regarding the water tanks of group B (the third and fourth water tanks), 4 days after the start of diatom culture in the water tanks of group A (that is, the fifth day), the culture solution of diatoms and the filtered seawater were used. The introduction work, the installation work of the algae breeding material and the underwater fluorescent lamp were carried out in the same manner as in the water tank of group A, the diatom culture was started, and the subsequent renewal work was also carried out by the same method and cycle as group A.

In this way, when the culture of the diatoms was started in each of the first to fourth water tanks, the diatoms grew smoothly. Therefore, the diatom grown in each aquarium was supplied to the pearl oyster as a feed.

The diatom was supplied (feeding) to the pearl oyster using a line pump and a feeding pipe having an electromagnetic valve and a check valve at the supply port of each water tank. More specifically, by controlling the line pump and electromagnetic valve using a timer, every 2 hours, a total of 1 day can be set.
Feeding was performed 0 times each. For each feeding, 15 L (60 L in total) of food was sucked from each water tank and transferred to the aquaculture tank containing the pearl oysters.

When feeding is performed by such a method, the water level in each aquarium is lowered each time, but in this microalgae growing apparatus, the water level in each aquarium is reduced by the amount corresponding to the water level lowered by feeding. Since it is configured to automatically inject and replenish filtered seawater into the inside, the growth of diatoms is continuously promoted, and as a result, diatoms are continuously cultured and grown in large amounts. I was able to.

Then, when this state was continued for several days,
Since good growth was observed in the pearl oysters that are the subject of aquaculture, this microalgae growth device allows a large amount of diatoms to be continuously grown so as to sufficiently cover the food required for culturing the pearl oysters. It was confirmed that it was possible.

The graph below shows the measurement results of the amount of diatoms cultured and propagated by the above method (the amount of chlorophyll a in seawater (μg / L) in each aquarium). .

[0060]

[Table 2]

As is clear from this graph, despite the inhalation and consumption of 150 L of food from each aquarium every day, the average of 6 L was obtained due to the continuous growth of diatoms.
The amount of chlorophyll a was from 00 to 800 μg / L.

[0062]

As described above, according to the method for growing microalgae according to the present invention, it is possible to grow microalgae continuously and in large quantities with extremely high efficiency. Therefore, it does not require a vast space when constructing the facility, and construction cost, running cost, etc. can be kept low, and it is excellent in economic efficiency.

Further, by supplying a large amount of microalgae grown by this method as a feed, it is possible to contribute to the realization of feeding culture for bivalves and the like. In this case, by controlling the quality and quantity of the feed, it is possible to stably produce the bivalves and the like to be cultured. Further, since the filtered seawater that constitutes the growth medium for microalgae is filtered by the seawater filtration tank, it is possible to eliminate harmful plankton, which is the source of shellfish poison, and to avoid the shellfish poisoning problem suitably. it can

Furthermore, since the microalgae growing apparatus for realizing this method can block infrared rays and ultraviolet rays in the water tank used, it is possible to prevent the rise in water temperature due to direct sunlight and also to prevent ultraviolet rays. It is possible to prevent adverse effects on microalgae due to the bactericidal action of.

Further, the aquarium is provided with a stirring means so that the components eluted from the filtered seawater, the microalgae and the algae growing material can be distributed in the aquarium at a uniform concentration, so that the components are unevenly distributed. It is possible to prevent the growth efficiency from being lowered.

Further, since the illumination is automatically turned on when the illuminance in the aquarium decreases, the decrease in photosynthesis due to the decrease in the illuminance of sunlight and the decrease in the growth efficiency of microalgae can be prevented. Can be prevented.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a microalgae growth apparatus of the present invention.

FIG. 2 is a sectional view of a water tank 6 used in the microalgae growing apparatus of FIG.

[Explanation of symbols]

1: control device, 2: means for supplying filtered seawater, 3: Water temperature control means, 4: Lighting means, 5: stirring means, 6: aquarium, 7: Seawater filter tank, 8: Filtered seawater tank, 9: Water pipe, 10: Underwater fluorescent lamp, 11: power supply, 12: Air Stone, 13: Air pump, 14: film, 15: Algae growth material, 16: filtered seawater, 18: Lid, 19: Water pump,

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Shigeru Kadoya             2393 Ikedo, Miki-cho, Kida-gun, Kagawa Prefecture Kagawa University Agriculture             Undergraduate F term (reference) 2B104 AA26 CA01 CB01 CB41 CF01                       CF11 CF28 EB05 EB19 EB21                       EC01 EC11 EC20 EG05

Claims (6)

[Claims] 1. An apparatus for continuously growing microalgae, which comprises a water tank formed of a transparent material that transmits sunlight, a filtered seawater supply means, a control device, and a water temperature control means. The aquarium is installed outdoors and has infrared and / or
Or, configured to be able to block ultraviolet rays, the filtered seawater supply means, a seawater filter tank for filtering the pumped seawater, and a filtered seawater tank for storing the filtered seawater produced by this seawater filter tank, It has a water supply pipe for supplying filtered seawater from the filtered seawater tank to the water tank, the water temperature control means is configured to hold the seawater in the water tank at a temperature suitable for the growth of microalgae, Under the control of the control device, the seawater in the aquarium containing the microalgae grown in the aquarium is taken out at a desired time in a desired amount and automatically transferred to the outside of the aquarium. The microalgae growing device is characterized in that the filtered seawater is automatically replenished in the water tank according to the amount of the seawater in the water tank taken out from the water tank. 2. The seawater filtration tank has a filter sand and a hollow fiber membrane filter, and when the filtered seawater is replenished in the water tank by the filtered seawater supply means, depending on the replenishment amount, The fine seawater according to claim 1, characterized in that natural seawater is automatically taken from the actual sea area, filtered to generate filtered seawater, and the filtered seawater is stored in the filtered seawater tank. Algae growth device. 3. A nutrient salt in the aquarium is prepared by dropping a required amount of the nutrient salt into the aquarium, or by installing a slow-acting algae-growing material that gradually elutes the nutrient salt in the aquarium. The microalgae growing apparatus according to claim 1 or 2, which is configured to compensate for a decrease in concentration. 4. When the illuminance in the water tank is lower than a predetermined level, the illuminance is detected and the lighting is automatically turned on. The microalgae growth apparatus according to any one of claims. 5. A transparent water tank configured to block infrared rays and / or ultraviolet rays is installed outdoors, and while introducing filtered seawater from the filtered seawater tank into the aquarium, a small amount of microalgae is added, From the algae growth material installed in the aquarium, the components necessary for the growth of microalgae are eluted into the filtered seawater, and the sunlight that has passed through the transparent aquarium, and the components eluted from the algae growth material Is a method of activating the microalgae added to, to efficiently grow the microalgae, wherein the aquarium seawater containing the microalgae grown in the aquarium is desired under the control of the controller. At the time of, the desired amount is taken out and automatically transferred to the outside of the water tank, and the filtered seawater is stored in the water tank according to the amount of the seawater in the water tank taken out from the water tank. Automatically Characterized in that it is configured to be replenished,
Method for growing microalgae. 6. A transparent water tank configured to block infrared rays and / or ultraviolet rays is installed outdoors, and filtered seawater is introduced into the water tank from the filtered seawater tank, and a small amount of microalgae is added, From the algae growth material installed in the aquarium, the components necessary for the growth of microalgae are eluted into the filtered seawater, and the sunlight that has passed through the transparent aquarium, and the components eluted from the algae growth material Is a method of activating the microalgae added to, to efficiently grow the microalgae, when the illuminance in the aquarium is lowered, the illumination installed in the aquarium is automatically turned on. A method for growing microalgae, which is characterized in that