JP6820511B2 - Algae-containing liquid concentration method, algae recovery method, algae concentration system, and algae recovery system - Google Patents

Description

The present invention relates to an algae-containing liquid concentration method, an algae recovery method, an algae concentration system, and an algae recovery system.

In recent years, algae have attracted attention as a material for biomass fuels and foods, and algae culture in large-scale plants has been actively carried out. On the other hand, when culturing algae, it is necessary to recover the algae from the culture solution, and as a method for recovering the algae, a method of centrifuging and precipitating the algae using a flocculant (see, for example, Patent Document 1). A method of filtering using a porous filter (see, for example, Patent Document 2) has been proposed and put into practical use.

However, the method of processing with a centrifuge requires a great deal of time and labor to process a large amount of culture solution, and the method of adding and processing a flocculant causes the collected algae to contain the flocculant. As a result, there is a problem that the use of algae is limited, such as difficulty in applying the algae to food use.

Further, even in the method of treating using a porous filter, there is a problem that it takes a lot of time and labor to remove the algae that are clogged in the porous filter (cleaning the filter).

On the other hand, a spring type filter in which a precoat material is precoated on the filtration surface is used, and the algae are concentrated by filtering the culture solution with this spring type filter, and after the concentration, the difference in specific gravity between the algae and the precoat material is used. That is, a method has been proposed in which the precoat material is separated from the concentrate and the algae are recovered by utilizing the fact that the specific gravity of the precoat material is larger than 1 and larger than that of the algae (Patent Documents 3 and 3). 4).

According to the treatment method using this spring type filter and precoat material, it is possible to solve the problems of the above-mentioned conventional method such as labor of separation processing, limitation of use, maintenance, etc., and it is possible to efficiently concentrate / recover algae. become.

International Publication No. 2013/024816 Japanese Unexamined Patent Publication No. 2014-150768 JP-A-2010-207790 JP-A-2002-126413

Here, many algae have a very small shape (particle size), and it is necessary to use a precoat material having a small particle size in order to reliably capture and remove such algae with a filter. However, when a fine-grained precoat material is used, the precoat material does not settle quickly when separating the algae from the precoat material in the concentrate, and it takes a long time to settle and separate the precoat material (it is quite difficult to separate). Can not).

On the other hand, it is also conceivable to shorten the time required for sedimentation and separation of the precoat material by using a precoat material having a larger specific gravity.

However, when a precoat material having a large specific gravity is used, the precoat material is a dispersion liquid when the dispersion liquid in which the precoat material is dispersed is filtered by a spring type filter and the precoat material is precoated on the filtered surface to form a precoat layer. It becomes difficult to evenly disperse the precoat material in the dispersion liquid because it is more in the lower part and less in the upper part. As a result, when the precoat material is precoated on the filtration surface of the spring type filter, a thick precoat layer is formed on the lower filtration surface, the precoat layer on the filtration surface above the lower filtration surface becomes thinner, and the filtration surface becomes thinner. The precoat layer is formed in a non-uniform state.

Then, if the algae concentration operation is performed using a spring type filter in which the state of the precoat layer is non-uniform above and below the filtration surface, the culture solution cannot be efficiently and suitably filtered. It ends up.

In view of the above circumstances, according to the present invention, the precoat material can be suitably (evenly) precoated on the filtration surface of the spring type filter, and the precoat material is prepared after concentrating the algae-containing liquid such as the culture solution with the spring type filter. It is an object of the present invention to provide an algae-containing liquid concentration method, an algae recovery method, an algae concentration system, and an algae recovery system that enable efficient recovery.

To achieve the above object, the present invention provides the following means.

The method for concentrating the algae-containing liquid of the present invention includes a precoat layer forming step of filtering a dispersion liquid in which a precoat material is dispersed and laminating a precoat layer on the filtration surface of a tubular spring filter, and a filtration surface using the precoat material. The algae-containing liquid is filtered using a spring-type filter covered with, and the algae accumulation step of accumulating the algae on the surface of the precoat layer, and the fluid is made to flow back through the spring-type filter to cause the precoat material and the algae The precoat material is provided with a step of recovering the algae by peeling the body from the filtration surface and recovering the algae, and the magnetic material provided inside the spring filter in the step of forming the precoat layer is used. A floating body is integrally attached to the magnetic material by attracting the precoat material in the dispersion liquid, and the magnetic material advances and retreats according to the amount of the fluid so that the precoat layer is laminated on the filtration surface. It is characterized by the fact that it was set to.

The algae recovery method of the present invention uses a tubular spring-type filter whose filtration surface is covered with a precoat material, filters the algae-containing liquid with the spring-type filter, and accumulates algae on the surface of the precoat material. Obtained in the body accumulation step, the algae recovery step of collecting the algae by causing the fluid to flow back through the spring filter to peel off the precoat material and the algae from the filtration surface, and the algae recovery step. The precoat material is provided with an algae separation step of treating the recovery liquid containing the precoat material and the algae to separate the precoat material and the algae, and the magnetic precoat material is used, and the algae separation step is performed. A magnetic material is brought into contact with the recovery liquid to collect the precoat material in the recovery liquid with the magnetic material so as to separate the precoat material and the algae body , and a floating body is formed inside the spring type filter. It is characterized in that a magnetic material attached integrally is arranged .

The algae concentration system of the present invention collects a tubular spring filter, a precoat material for covering the filtration surface of the spring filter to form a precoat layer, and algae filtered by the spring filter. The precoat material has a magnetic material and is provided with a magnetic material arranged inside the spring-type filter, and the magnetic material is arranged inside the spring-type filter to form a floating body. It is characterized by being integrally attached .

Further, in the algae concentration system of the present invention, it is desirable that the magnetic material is provided so as to be able to advance and retreat in the central axis direction of the spring type filter.

The algae recovery system of the present invention comprises a tubular spring filter, a precoat material for covering the filtration surface of the spring filter to form a precoat layer, and the algae filtered by the spring filter. A recovery unit for collecting the material and a separation unit for separating the collected precoat material and the algae are provided, and the precoat material has magnetism, and the precoat material is collected in the separation unit. A magnetic body for separating from the algae body is provided, and the magnetic body is disposed inside the spring type filter, and the floating body is integrally attached .

In the method for concentrating the algae-containing liquid and the algae concentrating system of the present invention, the precoat material in the dispersion liquid is provided by providing a magnetic precoat material and a magnetic material arranged inside a tubular spring-type filter. It can be attracted by a magnetic material to form a precoat layer suitable for the filtration surface of the spring type filter.

In the algae recovery method and the algae recovery system of the algae-containing liquid of the present invention, the precoat material in the recovery liquid sent to the separation part is provided by providing the magnetic precoat material and the magnetic material provided in the separation part. Can be sequestered with a magnetic material and separated from the algae body.

Therefore, according to the algae-containing liquid concentration method, the algae recovery method, the algae concentration system, and the algae recovery system of the present invention, a large amount of culture solution (algae-containing liquid) can be treated more easily and efficiently than before. It becomes possible to concentrate / recover (produce) the body.

It is a figure which shows an example of the algae enrichment system which concerns on one Embodiment of this invention. It is a figure which shows an example of the algae concentration system (algae concentration method) which concerns on one Embodiment of this invention. It is a figure which shows an example of the algae recovery system which concerns on one Embodiment of this invention. It is a figure which shows an example of the algae recovery system (algae recovery method) which concerns on one Embodiment of this invention. It is a figure which shows the algae concentration system which concerns on one Embodiment of this invention, the method of concentrating algae-containing liquid using the algae recovery system, and the method of recovering algae.

Hereinafter, a method for concentrating an algae-containing liquid, a method for recovering algae, a method for concentrating algae, and a system for recovering algae according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.

The present embodiment relates to a method and a system for culturing algae used as biomass fuel, food material, etc. in a large-scale plant by concentrating and recovering the cultivated algae using a spring filter. is there.

(Algae concentration system)
First, the algae concentration system of the present embodiment will be described.

As shown in FIG. 1, the algae concentration system 10 of the present embodiment has a bucket portion 1 having a container for storing the algae culture solution (algae-containing solution) to be filtered, and a cylindrical spring type which is a filtering means. At one end of the filter 3, the collection unit 2 having a container in which the spring type filter 3 is arranged, the pump P1 connected to each container of the bucket unit 1 and the collection unit 2, and the spring type filter 3. It is configured to include a connected compressor P2 and pipes and valves connecting each part.

Here, in the example of the algae concentration system 10 shown in FIG. 1, the liquid flows from the container of the bucket portion 1 to the container of the recovery unit 2 through the pipe 1a by driving the pump P1, and the internal pressure of the container of the collection unit 2 is reached. This liquid is configured to pass through the filtration surface of the spring type filter 3 and flow to the inner space to be filtered. Further, the filtrate is discharged to the outside from one end of the spring filter 3 through the pipe 3a, and air can be supplied to the inner space of the spring filter 3 through the pipe 3b by driving the compressor P2. ing.

The container of the recovery unit 2 is configured to accommodate and hold the algae filtered on the filtration surface (outer peripheral surface) of the spring filter 3 when the algae are peeled off from the filtration surface and fall. Further, the container of the collection unit 2 of the present embodiment is formed with a smaller volume than the container of the bucket unit 1. A valve and a pipe 2a for carrying out the liquid (fluid) in the container to the outside are connected to the bottom of the container of the collection unit 2.

As the spring type filter 3, for example, a wire rod having a substantially circular or polygonal cross section as disclosed in Japanese Patent No. 312491 is wound in a coil shape, and the outer peripheral surfaces adjacent to each other are formed into an arc shape and adjacent to each other. Examples thereof include those in which minute gaps are formed between the wires to be formed. The size of the minute gaps, that is, the size of the eyes of the filter is appropriately set according to the size of the algae to be filtered.

Further, in the algae concentration system 10 of the present embodiment, as shown in FIG. 2, a magnetic material 6 such as a magnet is placed inside the cylindrical spring type filter 3 in the vertical direction in the central axis O1 direction of the spring type filter 3. It is provided so that you can move forward and backward. Further, in the present embodiment, the floating body 7 is integrally attached to the magnetic body 6, and the magnetic body 6 arranged inside the spring type filter 3 by the floating body 7 is a liquid that has flowed into the container of the recovery unit 2. It is configured to move forward and backward according to the amount (liquid level).

(Algae recovery system)
Next, the algae recovery system of the present embodiment will be described.

As shown in FIG. 3, the algae recovery system 20 of the present embodiment includes a separation unit 5 for separating the precoat material 4 from the recovery liquid concentrated by the recovery unit 2 in addition to the same configuration as the algae concentration system 10. It is composed of.

Specifically, in the algae recovery system 20 of the present embodiment, for example, a spring type filter 3 in which the filtration surface is covered with a precoat material 4 and a precoat layer is laminated on the filtration surface, and algae filtered by the spring type filter 3 It is configured to include a recovery unit 2 for collecting the body and the precoat material 4, and a separation unit 5 for separating the collected precoat material 4 and the algae. The separation unit 5 is connected to the collection unit 2 and includes a container that receives and holds the collection liquid from the collection unit 2.

Here, the thickness of the precoat layer (layer of the precoat material 4) covering the filtration surface of the spring type filter 3 is preferably about 1 to 5 mm, for example. With a thickness of 1 mm or more, it is possible to sufficiently obtain effects such as prevention of filtration leakage (passage of the filtration surface) of algae and prevention / delay of clogging of the filtration surface due to the provision of the precoat layer. .. Further, when the thickness is 5 mm or less, it is possible to suppress an excessive increase in the suction force required for filtration.

Further, in the present embodiment, the precoat material 4 having magnetism is used, and the separation portion 5 separates the precoat material 4 and the algae by using magnetism instead of the difference in specific gravity between the algae and the precoat material 4. It is configured. That is, in the present embodiment, as shown in FIG. 4, the magnetic body 8 provided in the separation portion 5 is configured to be separated from the algae body by accommodating the magnetic precoat material 4.

The precoat material 4 of the present embodiment has magnetism and is formed so that its specific gravity is 1.5 to 3.5, more preferably 2.0 to 2.5. As described above, the precoat material 4 having magnetism and having a specific gravity of 1.5 to 3.5 is formed, for example, by coating the periphery of the magnetic material with a plastic having a small specific gravity. That is, it can be formed by using iron (specific gravity 7.87) as a magnetic inner material and polyethylene (specific gravity 0.94) as an outer specific gravity adjusting material. Further, for example, if the particle size of iron of the inner magnetic material is about 22 μm and the coating thickness of polyethylene is 16 μm, the precoat material 4 having a desired particle size and specific gravity can be surely formed. Since there is no problem even if the specific gravity is further reduced, the particle size of iron may be smaller than 22 μm, and the coating thickness of polyethylene may be 16 μm or more, which makes it easier to manufacture the precoat material.

In addition to the above, as a means for adjusting the specific gravity of the magnetic precoat material 4 to 1.5 to 3.5, a magnetic material may be used on the outside and a lightweight material (specific gravity adjusting material) may be used on the inside. Further, the precoat material 4 may be formed with a hollow structure. Further, a lightweight material may be used as a base material, and a magnetic material may be provided on a part of the outer side thereof. It may be formed by embedding an iron core in a lightweight material.

The precoat material 4 according to the present invention does not necessarily have to have a specific gravity of 1.5 to 3.5, and even if the specific gravity is smaller or larger than this range, as will be described later. With the magnetic materials 6 and 8, it is possible to preferably form a precoat layer and preferably separate and recover the precoat material 4.

(Algae-containing liquid concentration method / Algae recovery method)
Next, a method for concentrating the algae-containing liquid and a method for recovering the algae of the present embodiment will be described.

In the method for concentrating the algae-containing liquid of the present embodiment, as shown in FIGS. 5A to 5E, the dispersion liquid in which the precoat material 4 is dispersed is filtered, and the precoat layer is formed on the filtration surface of the spring type filter 3. The algae-containing liquid is filtered using the precoat layer forming step (FIGS. 5 (a) and 5 (b)) in which the algae-containing liquid is laminated and the spring type filter 3 whose filtration surface is covered with the precoat material 4 is used to filter the precoat layer. The algae accumulation step (FIG. 5 (c)) in which the algae are accumulated on the surface, and the precoat material 4 and the algae are peeled off from the filtration surface by backflowing the fluid through the spring filter 3 (containing algae). The algae recovery step (FIG. 5 (d), FIG. 5 (e)) for concentrating the liquid is carried out.

As a specific example of this concentration method, a case where the algae concentration system 10 is used will be described below with reference to FIGS. 5 (a) to 5 (d) and FIG.

As shown in FIG. 5A, first, a dispersion liquid containing the precoat material 4 dispersedly introduced is introduced into the container of the bucket portion 1. Next, the pump P1 sends the dispersion liquid from the bucket portion 1 into the container of the recovery portion 2 via the pipe 1a.

In this way, the dispersion liquid is sent to the recovery unit 2, the internal pressure of the container of the recovery unit 2 increases, and the dispersion liquid is filtered on the filtration surface (outer surface) of the cylindrical spring-type filter 3. At this time, as shown in FIG. 5B, the liquid component of the dispersion liquid is filtered into the inner space on the filtration surface of the spring type filter 3, and the precoat material 4 is captured and stays on the filtration surface. As a result, by continuously filtering the dispersion liquid, the precoat material 4 is sequentially deposited on the filtration surface of the spring type filter 3, and a precoat layer is formed.

Here, in the present embodiment, the magnetic body 6 is provided inside the spring type filter 3 so as to be integrated with the floating body 7 so as to be able to move forward and backward in the vertical direction. Therefore, as shown in FIG. 2, when the dispersion liquid is sent to the recovery unit 2, the precoat material 4 in the dispersion liquid is attracted by the magnetic material 6, and the precoat material 4 is attached to the filtration surface of the spring type filter 3. Accumulate. Further, at this time, as the amount (liquid level) of the dispersion liquid increases, the magnetic material 6 automatically rises and moves.
As a result, the precoat material 4 is suitably (uniformly) deposited on the entire filtration surface of the spring type filter 3, and the precoat layer can be suitably laminated and formed on the filtration surface.

At the stage where the precoat layer is laminated on the filtration surface of the spring type filter 3 in this way, as shown in FIG. 5C, the algae culture solution containing algae is introduced into the container of the bucket portion 1. Then, by driving the pump P1, the algae culture solution is sent from the bucket section 1 to the container of the recovery section 2 via the pipe 1a.

By this liquid feeding, the internal pressure of the container of the recovery unit 2 rises, and the algae culture solution in contact with the filtration surface (outer surface) of the cylindrical spring type filter 3 is filtered. Further, at this time, the liquid component is sucked into the inner space, and the relatively large solid component such as algae does not pass through the fine gaps on the surface of the precoat layer laminated and formed on the filtration surface of the spring type filter 3. , Stay on the surface of this precoat layer.

As a result, as shown in FIG. 5D, the algae culture solution is continuously filtered, and the algae are accumulated on the filtration surface (surface of the precoat layer) of the spring type filter 3.

After filtering an appropriate amount of the algae culture solution, as shown in FIG. 5 (e), the supply of the algae culture solution is stopped from the bucket portion 1, and air is sent to the inner space of the spring type filter 3 by the compressor P2. A small amount of air flows back toward the filtration surface (flows in the direction opposite to the filtration direction). This air can be replaced by other fluids and may be a liquid such as water.

Due to this backflow (backwashing), the precoat layer (precoat material 4) laminated on the filtration surface of the spring type filter 3 and the algae (algae) lumps accumulated on the surface of the precoat layer are peeled off from the spring type filter 3. It is collected in the container of the collection unit 2. At this time, the precoat layer can be relatively easily peeled off from the spring type filter 3 by backwashing, and the algae can be easily peeled off from the filter together with the precoat material 4 and recovered.

As a result, the algae culture solution is concentrated, and if the recovered solution containing the recovered algae is carried out from the carry-out valve of the recovery unit 2 via the pipe 2a, the algae concentrate can be obtained. According to the algae concentration method of the present embodiment described above, the total volume (for example, 20 parts by volume) of the algae-containing liquid supplied from the bucket unit 1 and filtered by the spring filter 3 is collected by the collection unit 2. The algae-containing liquid can be concentrated at a magnification (20 times in this example) divided by the volume of the liquid (for example, 1 volume part).

Further, it was troublesome to clean and clear the clogging of the conventional porous filter, but according to the algae concentration method of the present embodiment, the filtration surface of the spring type filter 3 is temporarily clogged. However, by peeling off the precoat layer and the algae mass by backwashing, clogging of the filtration surface of the spring type filter 3 can be easily (instantly) cleared.

Next, the algae recovery method of the present embodiment will be described.

In the algae recovery method of the present embodiment, as shown in FIGS. 5 (c) to 5 (f), the algae-containing liquid is filtered using the spring type filter 3 whose filtration surface is covered with the precoat material 4, and the algae-containing liquid is precoated. The algae accumulation step (FIG. 5C) in which the algae are accumulated on the surface of the layer, and the precoat material 4 and the algae are peeled off from the filtration surface by backflowing the fluid through the spring filter 3, and the precoat material 4 and the algae The algae recovery step (FIGS. 5 (d) and 5 (e)) for recovering (concentrating the algae-containing liquid) and the recovery liquid containing the precoat material 4 and the algae obtained in the algae recovery step are processed. Then, the algae separation step (FIG. 5 (f)) for separating the precoat material 4 and the algae is carried out.

That is, in the algae recovery method of the present embodiment, the precoat material 4 is separated and removed from the recovery liquid obtained by the above-mentioned algae concentration method to obtain a concentrated algae (algae).

As a specific example of this recovery method, a case where the algae recovery system 20 is used will be described with reference to FIGS. 5 (c) to 5 (f) and FIG.

As shown in FIGS. 5 (c) to 5 (f), the recovery liquid containing the algae and the precoat material 4 obtained in the same manner as the above-mentioned algae concentration method is separated from the carry-out valve of the recovery section 2 through the pipe 2a. Carry out to the container of 5.

Here, when a conventional precoat material (for example, a precoat material having a particle size of 38 μm and a true specific gravity of 2.3) is used, it takes about 1 hour for sedimentation separation to separate the algae and the precoat material. That is, the smaller the particle size of the precoat material, the longer it takes to recover the algae, and this separation treatment is one of the factors that cause a decrease in efficiency.

On the other hand, the precoat material 4 of the present embodiment has magnetism, and the separating portion 5 is provided with the magnetic body 8. Therefore, as shown in FIG. 4, the precoat material 4 is brought into contact with the recovery liquid by bringing the magnetic body 8 provided in the separation portion 5 into contact with the recovery liquid, and the precoat material 4 is separated from the algae body and recovered. Can be done. Further, as shown in FIG. 4, by configuring the magnetic body 8 so as to rotate and circulate, the precoat material 4 in the recovered liquid is sequentially conveyed to the outside of the container of the separation unit 5 for efficiency. Can be recovered.

Therefore, in the method for concentrating the algae-containing liquid and the algae concentrating system 10 of the present embodiment, the magnetic precoat material 4 and the magnetic material 6 arranged inside the tubular spring-type filter 3 are provided. The precoat material 4 in the dispersion liquid can be attracted by the magnetic material 6 to form a suitable (evenly) precoat layer on the filtration surface of the spring type filter 3.

Further, in the algae recovery method and the algae recovery system 20 of the algae-containing liquid of the present embodiment, the recovery sent to the separation section 5 is provided by providing the magnetic precoat material 4 and the magnetic body 8 of the separation section 5. The precoat material 4 in the liquid can be deposited with the magnetic material 8 and separated from the algae.

Therefore, according to the algae-containing liquid concentration method, the algae recovery method, the algae concentration system 10, and the algae recovery system 20 of the present embodiment, a large amount of culture liquid (algae-containing liquid) can be treated more easily and efficiently than before. This makes it possible to concentrate / recover (produce) algae.

Although one embodiment of the algae-containing liquid concentration method, the algae recovery method, the algae concentration system, and the algae recovery system according to the present invention has been described above, the present invention is not limited to the above-mentioned one embodiment. It can be changed as appropriate without departing from the purpose.

For example, in the present embodiment, the magnetic precoat material 4 is used to separate the precoat material 4 from the algae in the separation portion 5, but in addition to using the magnetism of the precoat material 4, the precoat material 4 is separated. The precoat material 4 may be separated from the algae by utilizing the difference in specific gravity between the material 4 and the algae. That is, a method of collecting the precoat material 4 with the magnetic material 5a and a method of sedimenting and collecting the precoat material 4 may be used in combination.

1 Bucket part 2 Recovery part 3 Spring type filter 4 Precoat material 5 Separation part 6 Magnetic material 7 Floating body 8 Magnetic material 10 Algae concentration system 20 Algae recovery system O1 Central axis of spring type filter

Claims (5)

A precoat layer forming step of filtering a dispersion liquid in which a precoat material is dispersed and laminating and forming a precoat layer on the filtration surface of a tubular spring filter.
The algae accumulation step of filtering the algae-containing liquid using a spring-type filter whose filtration surface is covered with the precoat material and accumulating the algae on the surface of the precoat layer.
The spring-type filter is provided with an algae recovery step in which a fluid is allowed to flow back to remove the precoat material and the algae from the filtration surface, and the algae are recovered.
Using the magnetic precoat material, the precoat material in the dispersion is attracted by the magnetic material provided inside the spring type filter in the precoat layer forming step, and the floating body is integrally attached to the magnetic material . A method for concentrating an algae-containing liquid, wherein the precoat layer is laminated on the filtration surface by advancing and retreating the magnetic material according to the amount of the fluid . Using a tubular spring-type filter whose filtration surface is covered with a precoat material, the algae-containing liquid is filtered by the spring-type filter, and the algae accumulation step of accumulating the algae on the surface of the precoat material.
The algae recovery step of regurgitating the fluid through the spring filter to peel off the precoat material and the algae from the filtration surface and recovering the algae.
It is provided with an algae separation step of treating the precoat material obtained in the algae recovery step and a recovery liquid containing the algae to separate the precoat material and the algae.
Using the magnetic precoat material, the magnetic material is brought into contact with the recovery liquid in the algae separation step, the precoat material in the recovery liquid is sorbed by the magnetic material, and the precoat material and the algae are combined. so as to separate,
A method for recovering algae, which comprises disposing a magnetic material to which a floating body is integrally attached inside the spring-type filter . With a tubular spring filter,
A precoat material for covering the filtration surface of the spring filter to form a precoat layer, and
It is equipped with a collection unit that collects algae filtered by the spring filter, and also has a collection unit.
The precoat material has magnetism and includes a magnetic material arranged inside the spring type filter .
An algae concentration system in which the magnetic material is disposed inside the spring-type filter and a floating body is integrally attached . In the algae concentration system according to claim 3.
An algae concentration system characterized in that the magnetic material is provided so as to be able to advance and retreat in the direction of the central axis of the spring type filter. With a tubular spring filter,
A precoat material for covering the filtration surface of the spring filter to form a precoat layer, and
A collection unit that collects the algae filtered by the spring filter together with the precoat material,
In addition to being provided with a separating portion for separating the recovered precoat material and the algae,
The precoat material has magnetism, and the separation portion is provided with a magnetic material for accommodating the precoat material and separating it from the algae .
An algae recovery system in which the magnetic material is arranged inside the spring-type filter and a floating body is integrally attached .

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