JP2018042470A - Condensation method of algae-containing liquid, algae recovery method, algae concentration system, and algae recovery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide algae-containing liquid concentration methods, algae recovery methods, algae concentration systems, and algae recovery systems which enable more easy and efficient algae concentration or recovery, the algae being comprised in an algae-containing liquid, such as a culture medium.SOLUTION: A method comprises filtrating a dispersion in which a precoat material 4 is dispersed to laminate a precoated layer on a filtration area of a spring type filter 3, filtrating an algae-containing liquid using the spring type filter 3 whose filtration area is covered with the precoat material 4 to accumulate an algae body on the surface of the precoated layer, and peeling the precoat material 4 and algae off the filtration area by flowing a fluid backwards in the spring type filter 3 to recover an algae body. In addition, using the precoat material 4 whose specific gravity is smaller than 1, a precoated layer is laminated on the filtering area, while inhibiting surfacing of the precoat material 4 in the dispersion and while guiding the precoat material 4 toward the filtration area, by a guiding means for suppressing surfacing of a precoat material, the guiding means being provided so as to be able to advance and retract in the vertical direction.SELECTED DRAWING: Figure 5

Description

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

  In recent years, algae has attracted attention as a biomass fuel, food material, and the like, and algae culture in a large-scale plant is actively performed. On the other hand, when performing algae culture, it is necessary to collect algae from the culture solution. As a method for collecting the algae, centrifugation, a method of sedimenting 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 to practical use.

  However, the method of treating with a centrifuge requires a lot of time and labor to process a large amount of culture solution, and the method of adding a flocculant to treat the collected algae contains the flocculant. As a result, there has been a problem that the use is restricted, such as it becomes difficult to apply algae to food use.

  Further, the method of treating with a porous filter also has a problem that it takes a lot of time and labor to remove the algal bodies clogged in the porous filter (filter washing).

  On the other hand, using a spring-type filter with a pre-coated material pre-coated on the filtration surface, the culture solution is filtered with this spring-type filter to concentrate the algae, and the concentrated solution using the specific gravity difference between the algal bodies and the pre-coated material A technique for separating a precoat material from the inside and collecting algae has been proposed (see Patent Document 3 and Patent Document 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 methods such as labor of separation treatment, limitation of use, maintenance, etc., and it is possible to efficiently concentrate / recover algae become.

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

  Here, many algae have a very small shape (particle diameter), and it is necessary to use a precoat material having a small particle diameter in order to reliably capture and remove such algae with a filter. However, when a fine precoat material is used, when separating the precoat material and the algal bodies in the concentrated liquid, the precoat material does not settle quickly, and it takes a lot of time for separation (cannot be easily separated).

  In view of the above circumstances, the present invention provides an algae-containing liquid concentration method, algae recovery method, and algae that can more easily and efficiently concentrate and recover algae contained in an algae-containing liquid such as a culture solution. An object is to provide a concentration system and an algal recovery system.

  In order to achieve the above object, the present invention provides the following means.

  The method for concentrating algae-containing liquid of the present invention includes a precoat layer forming step of filtering a dispersion in which a precoat material is dispersed and forming a precoat layer on the filter surface of a spring-type filter, and the precoat material covers the filtration surface. The algae-containing liquid is filtered using a spring-type filter, and algae bodies are accumulated on the surface of the precoat layer, and the precoat material and the algae bodies are separated from the spring-type filter by flowing a fluid backward. A pre-coating material floating step that is peeled off from the filtration surface and uses the pre-coating material having a specific gravity of less than 1 to prevent the floating of the pre-coating material provided in the pre-coating layer forming step. The precoating material is guided to the filtration surface while guiding the precoating material toward the filtration surface while suppressing the floating of the precoat material in the dispersion by the guiding means. Characterized in that the coat layer to be stacked form.

  The algae recovery method of the present invention uses a spring-type filter whose filtration surface is covered with a precoat material, filters the algae-containing liquid with the spring-type filter, and accumulates alga bodies on the surface of the precoat material. A fluid flow back to the spring filter to peel off the precoat material and the alga bodies from the filtration surface and recover the alga bodies, and the precoat material obtained in the alga body recovery step And an algal body separation step of separating the precoat material and the algal bodies by treating the recovered liquid containing the algal bodies, using the precoat material having a specific gravity of less than 1, in the algal body separation step, The precoat material floating on the liquid surface of the collected liquid is removed, and the precoat material and the algal bodies are separated.

  The algae concentration system of the present invention includes a spring filter, a precoat material for forming a precoat layer so as to cover the filtration surface of the spring filter, and a collection unit for collecting algal bodies filtered by the spring filter. And the precoat material is formed with a specific gravity smaller than 1, and is provided in the recovery portion so as to be able to advance and retreat in the vertical direction, while suppressing the floating of the precoat material in the liquid containing the precoat material. The present invention is characterized in that a precoat material levitation suppression guiding means for guiding the precoat material to the filtration surface is provided.

  In the algae concentration system of the present invention, the precoat material levitation suppression guiding means may be provided so as to advance and retreat according to the liquid level of the liquid containing the precoat material sent into the recovery unit. desirable.

  The algae recovery system of the present invention recovers a spring-type filter, a pre-coat material for forming a pre-coat layer so as to cover the filtration surface of the spring-type filter, and an algal body filtered by the spring-type filter together with the pre-coat material. And a separation unit for separating the precoat material and the algal bodies of the collected liquid collected by the collection unit, and the precoat material is formed with a specific gravity smaller than 1, and the separation unit And a precoat material removing / recovering means for removing the precoat material that has floated and gathered on the liquid surface of the recovered liquid from the recovered liquid.

  In the algae recovery system of the present invention, the precoat material removal recovery means is inserted and arranged in the recovery liquid from the liquid surface and is movably provided in the lateral direction, and floats on the liquid surface of the recovery liquid. It is desirable to provide a precoat material extruding section that pushes the collected precoat materials in the lateral direction and discharges them outside the separation section.

  In the method for concentrating algae-containing liquid and the algae concentration system of the present invention, even when a precoat material having a specific gravity of less than 1 is used, the precoat material is applied to the filtration surface while preventing the precoat material from rising in the dispersion. The precoat layer can be suitably laminated on the filtration surface by filtering the dispersion with a spring-type filter while moving the precoat material levitation suppression guiding means for guiding the up and down direction.

  In the algae collection method and algae collection system of the algae-containing liquid of the present invention, by using a precoat material having a specific gravity of less than 1 (as described above, a precoat material having a specific gravity of less than 1 is used. (Because the precoat layer can be suitably formed on the filtration surface), when separating the precoat material and the algal bodies in the recovered liquid, the precoat material that floats on the liquid surface of the recovered liquid automatically is removed. The precoat material and the algal bodies can be separated by operation.

  Therefore, according to the algae-containing liquid concentration method, algae collection method, algae concentration system, and algae collection system of the present invention, a large amount of culture solution (alga-containing solution) 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 concentration 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 collection | recovery system which concerns on one Embodiment of this invention. It is a figure which shows an example of the algae collection system (algae collection method) which concerns on one Embodiment of this invention. It is a figure which shows the method of concentrating the algae containing liquid using the algae concentration system which concerns on one Embodiment of this invention, and algae collection system, and the method of collect | recovering algae.

  Hereinafter, an algae-containing liquid concentration method, algae recovery method, algae concentration system, and algae recovery system 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 system for concentrating and recovering cultured algae using a spring-type filter, for example, when culturing algae used as a material for biomass fuel or food in a large-scale plant. is there.

(Algae concentration system)
First, the algal concentration system of this embodiment will be described.

  As shown in FIG. 1, the algal concentration system 10 of the present embodiment includes a bucket unit 1 having a container for storing algae culture liquid (algae-containing liquid) to be filtered, and a cylindrical spring type that is a filtering means. A filter 3, a collection unit 2 having a container in which the spring filter 3 is disposed, a pump P 1 connected to each container of the bucket unit 1 and the collection unit 2, and one end of the spring filter 3 The compressor P2 is connected, and piping and valves that connect the respective parts are provided.

  Here, in the example of the algae concentration system 10 shown in FIG. 1, the liquid flows from the container of the bucket unit 1 into 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 recovery unit 2 The liquid is configured to pass through the filtration surface of the spring-type filter 3 and pass through the inner space to be filtered. Further, the filtrate is configured to be discharged from one end of the spring type filter 3 to the outside through the pipe 3a and to supply air to the inner space of the spring type filter 3 through the pipe 3b by driving the compressor P2. ing.

  The container of the collection unit 2 is configured to accommodate and hold the algal bodies when the algal bodies filtered by the filtration surface (outer peripheral surface) of the spring-type filter 3 are peeled off from the filtration surface and dropped. 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. Connected to the bottom of the container of the recovery unit 2 is a valve and a pipe 2a for carrying out the liquid (fluid) in the container to the outside.

  As the spring filter 3, for example, a wire having a substantially circular or polygonal cross section as disclosed in Japanese Patent No. 3124901 is wound in a coil shape, and the adjacent outer peripheral surfaces of the wires are formed in an arc shape, and adjacent to each other. One in which minute gaps are formed between the wire rods to be used. The size of the minute gap, that is, the size of the filter eye is appropriately set according to the size of the algal bodies to be filtered.

  Furthermore, in the algae concentration system 10 of the present embodiment, as shown in FIG. 2, the algal concentration system 10 is supported by a cylindrical spring filter 3 and is provided so as to be able to advance and retract in the vertical direction of the central axis O1 of the spring filter 3. A precoat material levitation suppression guidance means (precoat material levitation suppression guidance member) 6 is provided.

  The precoat material levitation suppression guiding means 6 of this embodiment includes a center hole 6a through which the cylindrical spring filter 3 is inserted, and is supported by the spring filter 3 through the center hole 6a so as to be able to advance and retract in the vertical direction. Yes. The precoat material levitation suppression guiding means 6 is a substantially annular levitation suppression guidance projecting radially outward from the outer surface of the spring-type filter 3 around the central axis O1 while being supported so as to be movable back and forth in the vertical direction. A main body 6b is provided.

  In the present embodiment, the levitation suppression guiding main body 6b (at least a part of the levitation suppression guiding main body 6b) is formed so as to gradually incline downward from the outer surface of the spring filter 3 toward the outside. Further, the precoat material levitation deterring guiding means 6 is formed so that the entire outer peripheral end at the front end in the protruding direction of the levitation deterring guiding main body 6b is close to the inner surface of the container of the collecting unit 2, and together with the spring filter 3, the collecting unit 2 It is configured to advance and retract in the vertical direction while being guided by the inner surface of the container.

  Furthermore, the precoat material levitation deterring guiding means 6 of the present embodiment is formed with a specific gravity smaller than 1, or is formed so that the entire specific gravity is smaller than 1 with a floating body integrated therein, and the inside of the container of the recovery unit 2 In accordance with the amount (liquid level) of the liquid flowing into the liquid, that is, it is configured to advance and retreat by buoyancy from the liquid.

(Algae collection system)
Next, the algal collection system of this embodiment will be described.

  As shown in FIG. 3, the algal collection system 20 of the present embodiment includes a separation unit 5 for separating the precoat material 4 from the collected liquid concentrated in the collection unit 2 in addition to the same configuration as the algae concentration system 10. Configured.

  Specifically, the algae collection system 20 of the present embodiment includes, for example, a spring-type filter 3 in which a filtration surface is covered with a precoat material 4 and a precoat layer is laminated on the filtration surface, and algae filtered with the spring-type filter 3. The recovery part 2 which collects a body and the precoat material 4, and the isolation | separation part 5 which isolate | separates the collect | recovered precoat material 4 and an algal body are comprised. The separation unit 5 is connected to the recovery unit 2 and includes a container that receives and holds the recovered liquid from the recovery unit 2.

  Here, as a thickness of the precoat layer (layer of the precoat material 4) which covers the filtration surface of the spring type filter 3, about 1-5 mm is preferable, for example. By having a thickness of 1 mm or more, it is possible to sufficiently obtain effects such as prevention of filtration leakage (passing through the filtration surface) of algal bodies and prevention / delay of clogging of the filtration surface due to provision of the precoat layer. . Moreover, it can suppress that the suction force required for filtration increases too much because it is 5 mm or less.

  In the present embodiment, the precoat material 4 having a specific gravity smaller than 1 is used, and the precoat material 4 floating on the liquid surface of the collected liquid is collected by the separation unit 5 to separate the precoat material 4 and the algal bodies. It is configured. That is, in this embodiment, as shown in FIG. 4, the precoat material removal / recovery in which the precoat material 4 floating on the liquid surface of the recovered liquid sent to the separation unit 5 is sequentially discharged out of the container of the separation unit 5 and collected. Means 7 are provided.

  Further, the precoat material removal / recovery means 7 of the present embodiment is provided so as to be inserted into the recovered liquid from the liquid surface and movable in the lateral direction, and collects the precoat material 4 that has floated and collected on the liquid surface of the recovered liquid. It is configured to include a precoat material extruding portion 7 a that is pushed in the lateral direction and discharged out of the container of the separating portion 5.

(Concentration method of algae-containing liquid / algae recovery method)
Next, the method for concentrating the algae-containing liquid and the method for collecting algae according to this 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 applied to the filtration surface of the spring filter 3. The pre-coating layer forming step (FIG. 5A, FIG. 5B) and the spring-type filter 3 whose filtering surface is covered with the pre-coating material 4 are used to filter the algae-containing liquid, Algae accumulation step for accumulating alga bodies on the surface (FIG. 5 (c)), fluid is caused to flow backward through the spring-type filter 3, the precoat material 4 and the alga bodies are peeled off from the filtration surface, and the alga bodies are collected (algae-containing) The algal body collecting step (FIG. 5 (d), FIG. 5 (e)) 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 containing the precoat material 4 dispersed therein is introduced into the container of the bucket unit 1. Next, the dispersion liquid is sent from the bucket part 1 to the bottom side in the container of the recovery part 2 through the pipe 1a by the pump P1.

  When the dispersion liquid is fed to the bottom of the recovery unit 2 in this way, as shown in FIG. 2, the dispersion liquid accumulates in the recovery unit 2 and the precoat material levitation deterring guiding means 6 is the central axis O1 of the spring filter 3. Move upward along the direction. In addition, the precoat material 4 that is about to float in the recovered liquid is suppressed by the floating deterrence guiding main body 6b and automatically gathers directly under the levitating deterrence guiding main body 6b.

 Further, in the present embodiment, since the levitating suppression guiding main body portion 6b is formed so as to be gradually inclined downward toward the outside from the filtration surface of the spring type filter 3, the precoat gathered immediately below the levitating suppression guiding main body portion 6b. The material 4 is automatically guided to the filtration surface side of the spring type filter 3 by its specific gravity (buoyancy).

 As a result, when the dispersion liquid is sequentially fed to the bottom of the recovery section 2, the precoat material levitation deterring guiding means 6 sequentially moves upward in accordance with the liquid amount (liquid level) of the dispersion liquid, together with the spring filter. Thus, the precoat material 4 is guided so as to come into contact with the filtration surface 3 in the order from the bottom upward.

 Then, the dispersion liquid is fed from the bottom of the collection unit 2, thereby increasing the internal pressure of the container of the collection unit 2, and the dispersion liquid is filtered by the filtration surface (outside surface) of the cylindrical spring filter 3. . In this way, the liquid component of the dispersion liquid is filtered into the inner space of the filtration surface of the spring filter 3, and as shown in FIG. 5B, the precoat material guided by the precoat material levitation deterring guiding means 6 4 stays captured from the bottom to the top of the filtration surface.

 As a result, the precoat material 4 is automatically and sequentially deposited on the filtration surface of the spring-type filter 3 simply by feeding the dispersion liquid to the recovery unit 2, and the precoat layer is suitably (uniformly) formed.

  At the stage where the precoat layer is formed on the filtration surface of the spring-type filter 3, an algae culture solution containing algae is introduced into the container of the bucket unit 1 as shown in FIG. Then, the algae culture solution is fed from the bucket unit 1 into the container of the recovery unit 2 through the pipe 1a by driving the pump P1.

  By this liquid feeding, the internal pressure of the container of the collection unit 2 is increased, and the algae culture solution that contacts the filtration surface (outer surface) of the cylindrical spring filter 3 is filtered. At this time, the liquid component is sucked into the inner space, and a relatively large solid component such as algae does not pass through the fine gap on the surface of the precoat layer formed on the filtration surface of the spring filter 3. , Stay on the surface of this precoat layer.

  As a result, as shown in FIG. 5 (d), the algae culture solution is continuously filtered, and algae accumulate on the filtration surface (the 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), supply of the algae culture solution from the bucket unit 1 is stopped, and air is sent to the inner space of the spring-type filter 3 by the compressor P2. A small amount of air is allowed to flow backward to the filtration surface (flow in the direction opposite to the filtration direction). This air can be replaced with other fluids, and may be a liquid such as water.

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

  As a result, the algae culture solution is concentrated, and when the recovered solution containing the recovered algae is carried out from the carry-out valve of the collecting unit 2 to the outside through the pipe 2a, a concentrated solution of algae can be obtained. In addition, according to the algae concentration method of the present embodiment, the recovery unit 2 collects 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. 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 part by volume).

  Moreover, although it has been troublesome to clean and eliminate the clogging of the conventional porous filter, according to the algae concentration method of the present embodiment, the filtration surface of the spring filter 3 is temporarily clogged. However, clogging of the filtration surface of the spring-type filter 3 can be easily (instantly) eliminated by peeling off the precoat layer and the algae mass by backwashing.

  Next, the algal collection method of this embodiment will be described.

  In the algae recovery method of the present embodiment, as shown in FIGS. 5C to 5F, the algae-containing liquid is filtered using a spring-type filter 3 whose filtration surface is covered with the precoat material 4, and the precoat is applied. The algal body accumulation step (FIG. 5 (c)) for accumulating algal bodies on the surface of the layer, and the pre-coat material 4 and the algal bodies are peeled off from the filtration surface by causing the fluid to flow backward through the spring-type filter 3, and the pre-coat material 4 and the algal bodies (Concentrate the algae-containing liquid) algae body recovery step (FIG. 5 (d), FIG. 5 (e)), and processing the recovered liquid containing the precoat material 4 and alga bodies obtained in the algae body recovery step Then, an algal body separation step (FIG. 5 (f)) for separating the precoat material 4 and the algal bodies is performed.

  That is, in the algae collection method of this embodiment, the pre-coating material 4 is separated and removed from the collected solution obtained by the algae concentration method to obtain a concentrated alga body (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 FIG. 5 (c) to FIG. 5 (f), the separation liquid containing the algae and the precoat material 4 obtained in the same manner as the algae concentration method described above is separated from the carry-out valve of the collection unit 2 through the pipe 2a. Unload to 5 containers.

  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 the separation of the alga bodies and the precoat material by sedimentation. That is, the smaller the particle size of the precoat material, the more time is required for the recovery of the alga bodies, and this separation process is one factor that causes a decrease in efficiency.

  On the other hand, since the precoat material 4 of the present embodiment is formed with a specific gravity smaller than 1, as shown in FIG. 4, the recovered liquid is sent to the separation unit 5 and the precoat material 4 is lifted up to automatically To separate. Further, the precoat material 4 floating on the liquid surface of the recovered liquid can be sequentially guided to a predetermined place and recovered by the precoat material removal and recovery means 7.

  At this time, in this embodiment, the precoat material extruding portion 7a inserted and arranged in the recovered liquid from the liquid surface moves in the horizontal direction, so that the precoat material 4 that floats and collects on the liquid surface of the recovered liquid is in the horizontal direction. And are sequentially discharged out of the container of the separation unit 5.

  Therefore, in the method for concentrating the algae-containing liquid and the algae concentration system 10 of this embodiment, even when the precoat material 4 having a specific gravity smaller than 1 is used, the floating of the precoat material 4 in the dispersion is suppressed. While the precoat material levitation deterring guiding means 6 for guiding the precoat material 4 to the filtration surface is moved in the vertical direction, the dispersion liquid is filtered by the spring type filter 3 so that the precoat layer is suitably laminated on the filtration surface. it can.

  Moreover, in the algae collection method and algae collection system 20 of the algae containing liquid of this embodiment, by using the precoat material 4 having a specific gravity smaller than 1, that is, using the precoat material 4 having a specific gravity smaller than 1, the spring Since the precoat layer can be suitably formed on the filtration surface of the filter 3, the precoat material 4 that automatically floats and collects on the liquid surface of the collected liquid when separating the precoat material 4 and the algal bodies in the collected liquid. It becomes possible to separate the precoat material 4 and the algal bodies by a simple operation of removing the.

  Therefore, according to the algae-containing liquid concentration method, algae recovery method, algae concentration system 10, and algae recovery system 20 of this embodiment, a large amount of culture liquid (alga-containing liquid) can be processed more simply and efficiently than before. Thus, the algal bodies can be concentrated / collected (produced).

  As mentioned above, although one embodiment of the concentration method of the algae containing liquid concerning the present invention, algae collection method, algae concentration system, and algae collection system was explained, the present invention is not limited to the above-mentioned one embodiment, Changes can be made as appropriate without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Bucket part 2 Collection | recovery part 3 Spring type filter 4 Precoat material 5 Separation part 6 Precoat material floating suppression guidance means 6a Center hole 6b Levitation suppression guidance main-body part 7 Precoat material removal collection means 7a Precoat material extrusion part 10 Algae concentration system 20 Algae collection System O1 Spring shaft central axis

Claims (6)

A precoat layer forming step of filtering the dispersion in which the precoat material is dispersed and laminating a precoat layer on the filtration surface of the spring-type filter;
Filtering the algae-containing liquid using a spring-type filter whose filtration surface is covered with the precoat material, and collecting algae on the surface of the precoat layer,
A flow of fluid to the spring-type filter to peel off the precoat material and the algal bodies from the filtration surface, and an algal body recovery step for recovering the algal bodies,
Using the precoat material having a specific gravity of less than 1, and in the precoat layer forming step, the precoat material levitation deterring guiding means provided so as to be able to advance and retreat in the vertical direction while suppressing the levitation of the precoat material in the dispersion. The method for concentrating algae-containing liquid, wherein the precoat layer is formed on the filtration surface while the precoat material is guided toward the filtration surface. Using a spring-type filter whose filtration surface is covered with a precoat material, filtering the algae-containing liquid with the spring-type filter, and collecting the alga bodies on the surface of the precoat material,
An algal body recovery step of causing the fluid to flow backward through the spring filter to peel off the precoat material and the algal bodies from the filtration surface, and recovering the algal bodies;
An algal body separation step of separating the precoat material and the algal bodies by treating the precoat material obtained in the algal body recovery step and the recovery liquid containing the algal bodies;
The precoat material having a specific gravity of less than 1 is used, the precoat material floating on the liquid surface of the recovered liquid is removed in the algal body separation step, and the precoat material and the alga bodies are separated. Algae recovery method. A spring type filter,
A precoat material for covering the filtration surface of the spring filter to form a precoat layer;
A recovery unit for recovering the algal bodies filtered by the spring filter,
The precoat material is formed with a specific gravity smaller than 1, and is provided in the recovery portion so as to be movable up and down in the vertical direction, while preventing the precoat material in the liquid containing the precoat material from floating on the filtration surface. An algae concentration system comprising a precoat material levitation suppression guiding means for guiding the precoat material. The algae concentration system according to claim 3,
The algae concentration system, wherein the precoat material levitation suppression guiding means is provided so as to advance and retreat in accordance with a liquid level of the liquid containing the precoat material sent into the recovery unit. A spring type filter,
A precoat material for covering the filtration surface of the spring filter to form a precoat layer;
A collection unit for collecting the algal bodies filtered by the spring filter together with the precoat material;
A separation unit that separates the precoat material and the algal bodies of the collected liquid collected by the collection unit,
The precoat material is formed with a specific gravity smaller than 1, and the separation unit is provided with a precoat material removal / recovery means for removing the precoat material that has floated and collected on the liquid surface of the recovery liquid from the recovery liquid. An algae collection system characterized by that. In the algae recovery system according to claim 5,
The precoat material removing and collecting means is inserted and arranged in the recovered liquid from the liquid surface and is provided so as to be movable in the horizontal direction, and the precoat material that has floated and gathered on the liquid surface of the recovered liquid in the horizontal direction. An algae collection system comprising a precoat material extruding unit that is pushed and discharged out of the separation unit.

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