JP2018085938A - Algae-containing liquid concentration method, algae recovery method, algae concentration system and algae recovery system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an algae-containing liquid concentration method, an algae recovery method, an algae concentration system and an algae recovery system capable of easily and efficiently performing concentration and recovery of algae included in an algae-containing liquid such as a culture fluid.SOLUTION: The algae-containing liquid concentration method comprises: a step for filtering a dispersion fluid in which a pre-coat layer 4 is dispersed and laminating and forming a precoat layer on a filtration surface of a spring type filter 3; a step for filtering the algae-containing liquid using a spring type filter 3 whose filtration surface is covered with the pre-coat material 4 and accumulating an algae body on a surface of the pre-coat layer; and a step for making a fluid flow backward to the spring type filter 3, peeling the pre-coat material 4 and the algae body from the filtration surface and recovering the algae body. Further, the pre-coat material 4 having magnetism and whose specific gravity is equal to or more than 2.5 is used, and the pre-coat material is attracted by a magnetic substance, and the filtration surface is covered with the pre-coat material 4.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 algae are concentrated by filtering the culture solution with this spring-type filter, and after concentration, the difference in specific gravity between the alga body and the pre-coated material is utilized. A method for separating a precoat material from a concentrated liquid 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 a filtration surface of a cylindrical spring filter, and a filtration surface using the precoat material. The algae-containing liquid is filtered using a spring-type filter covered with algae, and the algae accumulation process for accumulating algae bodies on the surface of the precoat layer, and the precoat material and the algae are made to flow back through the spring-type filter. An algae body collecting step for removing the body from the filtration surface and collecting the algae bodies, using the precoat material having magnetism and having a specific gravity of 2.5 or more, and in the precoat layer forming step, The filter surface is attracted and covered with the precoat material.

  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 alga bodies by treating the recovered liquid containing the alga bodies, using the precoat material having magnetism and a specific gravity of 2.5 or more, In the alga body separation step, the precoat material is allowed to settle to separate the precoat material and the alga bodies.

  The algae concentration system of the present invention includes a spring filter, a precoat material that is magnetic and has a specific gravity of 2.5 or more, covers a filtration surface of the spring filter, and forms a precoat layer. And a collection unit for collecting the algal bodies filtered by the spring type filter.

  The algae collection system of the present invention includes a spring filter, a precoat material that has magnetism and has a specific gravity of 2.5 or more, covers a filtration surface of the spring filter, and forms a precoat layer. A collection unit that collects the algal bodies filtered by a spring-type filter together with the precoat material, and the precoat material collected by the collection unit and the collected liquid containing the algal bodies are allowed to stand to settle and separate the precoat material. And a separation unit.

  In the method for concentrating algae-containing liquid and the algae concentration system of the present invention, even when a precoat material having magnetism and a large specific gravity of 2.5 or more is used, the precoat material in the dispersion is attracted by the magnetic substance. A precoat layer can be suitably formed on the filtration surface of the spring filter.

  In the algae collection method and algae collection system of the algae-containing liquid of the present invention, by using a precoat material having magnetism and a large specific gravity of 2.5 or more, the precoat material in the collected liquid is quickly settled in the separation part. Can be separated from algal bodies.

  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, a magnetic body 6 such as a magnet is vertically moved in the direction of the central axis O <b> 1 of the spring filter 3 inside the cylindrical spring filter 3. It is provided to be able to advance and retreat. Further, in this embodiment, the floating body 7 is integrally attached to the magnetic body 6, and the magnetic body 6 arranged inside the spring filter 3 by the floating body 7 flows into the container of the recovery unit 2. It is configured to advance and retreat according to the amount (liquid level).

(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 magnetism is used, and the separation unit 5 separates the precoat material 4 and the algal bodies using magnetism, not the specific gravity difference between the algal bodies and the precoat material 4. It is configured. That is, in this embodiment, as shown in FIG. 4, it is comprised so that it may isolate | separate from an alga body by making the magnetic body 8 comprised in the isolation | separation part 5 sorb | suck the magnetic precoat material 4. As shown in FIG.

  The precoat material 4 of the present embodiment is magnetic and has a specific gravity of 2.5 or more. The precoat material 4 having magnetism and having a specific gravity of 2.5 or more is formed, for example, by coating the periphery of a magnetic material with a plastic having a low specific gravity. That is, it can be formed by using iron (specific gravity 7.87) as an inner material having magnetism and polyethylene (specific gravity 0.94) as an outer specific gravity adjusting material.

  In addition to the above, the precoat material 4 may be composed of a magnetic material on the outside and a lightweight material (specific gravity adjusting material) on the inside. Further, the precoat material 4 may be formed in a hollow structure. Furthermore, a lightweight material may be used as a base material, and a magnetic material may be provided on a part of the outside. You may embed an iron core in a lightweight material.

(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 fed into the container of the recovery unit 2 from the bucket unit 1 through the pipe 1a by the pump P1.

  In this way, the dispersion liquid is fed to the recovery unit 2 and the internal pressure of the container of the recovery unit 2 is increased, and the dispersion liquid is filtered by the filtration surface (outer surface) of the cylindrical spring 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 filter 3, and the precoat material 4 is captured and stays on the filtration surface. Thereby, by continuously filtering the dispersion, the precoat material 4 is sequentially deposited on the filtration surface of the spring-type filter 3 to form a precoat layer.

  Here, in the present embodiment, the magnetic body 6 is provided in the spring filter 3 so as to be integrated with the floating body 7 so as to advance and retreat in the vertical direction. For this reason, as shown in FIG. 2, when the dispersion liquid is fed to the collection unit 2, the precoat material 4 in the dispersion liquid is attracted by the magnetic body 6, and the precoat material 4 is applied to the filtration surface of the spring filter 3. It will accumulate. Furthermore, at this time, the amount of liquid dispersion (liquid level) increases and the magnetic body 6 automatically moves up and down.

  Thereby, even when the precoat material 4 having a large specific gravity of 2.5 or more is used, the precoat material 4 in the dispersion is sequentially drawn by the magnetic body 6 and is suitably applied to the entire filtration surface of the spring filter 3 ( (Evenly). That is, the precoat layer can be suitably laminated on the filtration surface.

  In this way, 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, since the precoat material 4 is formed with a large specific gravity of 2.5 or more, the precoat layer can be peeled off from the spring-type filter 3 relatively easily by backwashing, and the algae can be easily removed together with the precoat material 4. It can be recovered by removing it from the filter.

  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, since the precoat material 4 is formed with a large specific gravity of 2.5 or more, the precoat layer and the algae lump can be easily peeled off by backwashing, and the filter surface of the spring filter 3 can be easily clogged. It can be resolved (instantly).

  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, the precoat material 4 of the present embodiment is magnetic and has a specific gravity of 2.5 or more. Further, in the present embodiment, the separation body 5 is provided with a magnetic body 8. For this reason, as shown in FIG. 4, the precoat material 4 with a large specific gravity can be quickly settled by leaving the collection | recovery liquid sent to the separation part 5 still.

  Further, the magnetic body 8 provided in the separation unit 5 is brought into contact with the recovered liquid, and the precoat material 4 is sorbed onto the magnetic body 8 by contacting with the precoat material 4 settled on the bottom of the separation unit 5, It can be separated and collected from algal bodies.

  Further, as shown in FIG. 4, the sorbing surface of the magnetic body 8 is configured to rotate and circulate, so that the precoat material 4 in the recovered liquid is sequentially conveyed out of the container of the separation unit 5 to improve efficiency. Can be recovered automatically.

  Therefore, in the method for concentrating the algae-containing liquid and the algae concentration system 10 according to the present embodiment, even if the precoat material 4 having magnetism and having a large specific gravity of 2.5 or more is used, the dispersion liquid is used by the magnetic body 6. The precoat material 4 inside can be drawn and a precoat layer can be suitably formed on the filtration surface of the spring type filter 3.

  Moreover, in the algae collection method and algae collection system 20 of the algae-containing liquid of the present embodiment, the precoat material 4 having magnetism and a large specific gravity of 2.5 or more is used, so that the separation unit 5 precoats the collected liquid. The material 4 can be quickly settled and separated from the algal bodies.

  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.

  For example, in the present embodiment, description has been made assuming that the magnetic property of the precoat material 4 is used and the precoat material 4 is separated from the algae by the separation unit 5, but the precoat material 4 having a large specific gravity is allowed to settle and the magnetic material 8. You may isolate | separate from an algal body without using.

  In the present embodiment, the spring filter 3 is formed in a cylindrical shape, and the magnetic body 6 is provided inside the spring filter 3 so as to freely move back and forth. However, the precoat material having a large specific gravity on the filtration surface of the spring filter 3 If the precoat layer can be formed by depositing 4, the magnetic body 6 is not necessarily provided so as to be able to advance and retract.

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

Claims (4)

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,
An algae-containing liquid characterized by using the precoat material having magnetism and a specific gravity of 2.5 or more, and attracting with a magnetic material to cover the filtration surface with the precoat material in the precoat layer forming step. Concentration method. 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 magnetism and a specific gravity of 2.5 or more is used, and the precoat material is settled in the algal body separation step to separate the precoat material and the alga bodies. Algae collection method. A spring type filter,
A precoat material having magnetism and having a specific gravity of 2.5 or more, for covering the filtration surface of the spring filter and forming a precoat layer;
An algae concentration system comprising: a recovery unit that recovers algal bodies filtered by the spring filter. A spring type filter,
A precoat material having magnetism and having a specific gravity of 2.5 or more, for covering the filtration surface of the spring filter and forming a precoat layer;
A collection unit for collecting the algal bodies filtered by the spring filter together with the precoat material;
An algae collection system comprising: a separation unit for allowing the precoat material collected by the collection unit and the collection liquid containing the algal bodies to stand and settling and separating the precoat material.

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