JP6802016B2 - Granules for aquatic organism collection and water purification system - Google Patents

Description

The present invention relates to granules for aquatic organism collection and a water purification system.

In recent years, seagrass beds and tidal flats have been decreasing in the coastal waters of Japan due to the occurrence of shore burning and reclamation due to coastal development. Seagrass beds have the function of absorbing phosphorus and nitrogen, which are the causative substances of eutrophication, and tidal flats have the function of buffering the inflow of nutrient salts from the land area. However, due to the decrease in seagrass beds and tidal flats, eutrophication in the sea progresses, and so-called red tide occurs due to overgrowth of plankton, which has a problem of adversely affecting fisheries and aquaculture.
As one of the measures to solve these problems, a method of purifying the water area (water quality) using bivalves such as oysters and clams is being studied. Bunka is a nutritional component such as phytoplankton that grows on nutrients such as phosphorus and nitrogen in water, zooplankton that grows on the phytoplankton as food, and the remains and excrement of these plankton (hereinafter, simply ". As a result, it is possible to purify the water area by absorbing phosphorus, nitrogen, etc. in the water because it eats "nutrient components"). For example, in Patent Document 1, a string-like substance having a large number of dispersed threads is hung in seawater or fresh water, and a large amount of byssus-adherent bivalves are selectively attached to the dispersed threads to float a suspended organic substance. A method for purifying seawater or freshwater is described, which comprises feeding, growing and recovering on land.

On the other hand, in the field of aquaculture, in aquaculture of oysters, a method for preventing oysters from being killed by organic substances such as pollutants and toxic gas generated from excrement of seafood is being studied. For example, Patent Document 2 is characterized in that a bamboo charcoal mat is laid on a farming raft as a means for purifying seawater and reducing the death of farmed oysters in a farming method for making oyster seeded juveniles a hanging type. The aquaculture method is described.

Japanese Patent No. 3013314 Japanese Unexamined Patent Publication No. 2004-105081

Bivalves do not digest and absorb all the nutrients they eat, and the nutrients they eat more than necessary are discharged into solids called "fake feces" by mucus. After falling to the seabed, the discharged fake feces become food for aquatic organisms (for example, crustaceans such as crabs, small animals such as small fish, and benthic organisms such as worms).
In the method described in Patent Document 1, when fake feces are excessively discharged, nutrients are accumulated in the sea (particularly the seabed) and eutrophication occurs, which deteriorates the environment in the sea (particularly the seabed). Is a concern. In addition, the method described in Patent Document 2 requires labor for laying the bamboo charcoal mat, the position of the bamboo charcoal mat shifts or sags due to the influence of waves and sea currents, and the bamboo charcoal mat When suspended solids or sand are deposited on the top, there is a problem that excrement (pseudo-feces) cannot be efficiently adsorbed and the effect is reduced.
Therefore, an object of the present invention is to provide a system capable of efficiently treating granules capable of collecting aquatic organisms and excrement (pseudofeces) from bivalves and purifying the water area. It is to be.

As a result of diligent studies to solve the above problems, the present inventors have impregnated a porous particle with a component for collecting aquatic organisms, and the surface of the core body. The present invention was completed by finding that the object of the present invention can be achieved by the aquatic organism collecting granules formed in 1 and containing a coating layer made of a water-hard composition.
That is, the present invention provides the following [1] to [10].
[1] Includes a core body formed by impregnating porous granules with a component for collecting aquatic organisms, and a coating layer made of a water-hard composition formed on the surface of the core body. Characteristic aquatic organism collection granules.
[2] The aquatic organism collection granule according to the above [1], wherein the component for collecting the aquatic organism is an amino acid, a peptide, or a protein.
[3] The aquatic organism collecting granule according to the above [1] or [2], wherein the core body has a particle size of 50 mm or less and the coating layer thickness is 0.1 to 10 mm.

[4] Water area purification comprising the aquatic organism collecting granules according to any one of [1] to [3] and bivalves arranged in a region in the vicinity of the aquatic organism collecting granules. system.
[5] The water area purification system according to the above [4], wherein the bivalve molluscs are arranged in water by a hanging means.
[6] The water body purification system according to the above [5], wherein the hanging means includes a hanging support and a cement-based adhesive for fixing the bivalve shell to the hanging support.
[7] The water area purification system according to the above [4], wherein the bivalve molluscs are arranged on the bottom of the water.
[8] The water purification system according to any one of [4] to [7] above, wherein the bivalve is a scallop, an oyster, a mussel, a pearl oyster, a clam, a clam, a clam or a mussel.
[9] A cement composition containing the aquatic organism collecting granules, cement, and water according to any one of [1] to [3] above.
[10] A hardened cementum in which at least the surface-forming portion comprises the cement composition according to the above [9].

According to the aquatic organism collecting granules of the present invention, aquatic organisms can be collected.
In addition, according to the water purification system of the present invention, by collecting aquatic organisms, excrement (fake feces) from bivalves is efficiently treated to purify the water area and suppress eutrophication of the water area. be able to.

It is sectional drawing which shows typically the state which the granule for aquatic organism collection of this invention was cut by the cut plane passing through the center of the granule. It is a figure which shows an example of the water area purification system of this invention which contains the granules for aquatic organism collection, and the bivalve which is arranged in the sea by the hanging means. It is a figure which shows another example of the water area purification system of this invention which contains the granules for aquatic organism collection and the bivalve which is arranged on the seabed.

Hereinafter, the aquatic organism collecting granules of the present invention will be described in detail with reference to FIG.
The aquatic organism collecting granule 1 of the present invention is a core body 2 formed by impregnating a porous granule with a component for collecting aquatic organisms (hereinafter, also referred to as “collection component”), and the said. It contains a coating layer 3 made of a water-hard composition formed on the surface of a core body.
The collection component refers to a component capable of collecting aquatic organisms. Amino acids such as alanine, arginine, aspartic acid, cysteine, glutamic acid, glycine, histidine, isoleucine, leucine, lysine, methionine, phenylalanine, proline, serine, threonine, tyrosine, valine, tryptophan, ornithine, and these Examples thereof include peptides and proteins containing the amino acids of the above as constituents.
As the collection component, one type may be used alone, or two or more types may be used in combination.
In the present invention, for example, broth or the like can be used as a substance containing two or more kinds of collection components.

The porous granules may be made of a material that can be impregnated with the collection component, and either an inorganic material or an organic material can be used.
In the present invention, by using the porous granules, the impregnable amount of the collection component can be increased and the time required for impregnation can be shortened.
Inorganic materials include, for example, shale, pumice, volcanic zeolite, diatomaceous earth, silas, vermiculite, calcium carbonate-containing substances (limestone, shells, chicken egg shells, etc.) and their calcined products; Kay hydrothermally synthesized by autoclave. Crushed and crushed products of calcium silicate compounds; Crushed and crushed products of calcium silicate compounds foamed with aluminum powder; Fired products obtained by crushing pearlite and vermiculite and then firing and foaming; Brick, ceramics, etc. Examples include crushed substances.
Examples of the organic material include foamed synthetic resins such as polyurethane, polyethylene, polystyrene, polyvinyl chloride, and polyvinyl alcohol; natural and artificial rubbers, and crushed wood materials.
The type of wood in the above wood-based materials is not particularly limited. Further, as the wood-based material, sawdust generated during cutting of wood, scraps generated during plywood production, construction waste, crushed materials such as wood generated during thinning, and the like can be used.

The porous granules may be used without adjusting the particle size (particle size when the particles are spherical, longitudinal dimensions when the particles are rod-shaped), and the particle size is within a specific range depending on the purpose. You may adjust and use it as follows. The particle size varies depending on the shape of the granules, but is preferably 50 mm or less, more preferably 30 mm or less, from the viewpoint of sufficiently immersing the collection component into the inside of the granules when impregnating. Further, the particle size is preferably 20 mm or less, more preferably 10 mm or less, and particularly preferably 5 mm or less from the viewpoint of ease of molding when performing molding described later.

By impregnating the porous granules with the collection component, it is possible to obtain a core body 2 in which the collection component is impregnated from a plurality of pores of the porous granule and the collection component is contained therein.
As a method of impregnating the porous particles with the collection component, for example, a method of immersing the particles in a liquid material containing the collection component and water for a certain period of time, or a method of immersing the liquid material and the particles in a mixer is used. There is a method of kneading. Above all, a method of kneading using a mixer is preferable from the viewpoint of sufficiently immersing the liquid substance in a short time.
The above mixer is not particularly limited, and a mixer generally used in mixing granules (for example, a mixer used for kneading mortar or concrete) may be used.
Specific examples thereof include a vertical mixer, a horizontal mixer, a nouter mixer, a tilting mixer, a forced mixer, and a biaxial mixer. Examples of the vertical mixer include a "Hobert mixer" manufactured by Hobart and a "Henschel mixer" manufactured by Henschel. Examples of the horizontal mixer include a "Radige mixer" manufactured by Ladyge.
Alternatively, the granules and the liquid material may be put into a container such as a pail can and kneaded using a hand mixer or the like to impregnate the particles.

The liquid substance containing the collection component and water is an aqueous solution or suspension obtained by mixing the above-mentioned collection component and water in an appropriate mixing ratio according to the intended use. As the liquid material, it is also possible to use broth or the like discharged in the food processing industry or the fishery processing industry.
In addition, other components such as nitrogen, phosphorus, potassium, magnesium, silicon, sulfur, etc., and iron, copper, zinc, nickel, manganese, cobalt, molybdenum, etc. Trace components of inorganic fertilizer and the like may be contained in an amount within a range that does not affect the collection of aquatic organisms.

The blending amount of the liquid material varies depending on the solid content concentration of the liquid material, but from the viewpoint that it is easy to mold the granules after impregnation and the core body 2 after molding does not collapse, the granules It is preferably 10 to 400 parts by mass, more preferably 50 to 300 parts by mass with respect to 100 parts by mass.

The granules impregnated with the collection component may be used as they are as the core body 2 in the present invention, but from the viewpoint of obtaining the aquatic organism collection granules 1 sufficiently impregnated with the collection component, the granules are impregnated with the collection component. It is preferable to use a molded product (molded granulated product) obtained by molding the grain body as the core body 2.
As a method for producing the molded product (molded granulated product), various granulation methods such as rolling granulation, stirring granulation, compression granulation, and extrusion granulation can be used. Further, as an apparatus used for granulation, a pan pelletizer, a mixer, a disc pelleter or the like can be used.
In addition, a binder may be added as needed during molding.
The particle size of the core body 2 is preferably 0.1 to 50 mm, more preferably 0.5 to 20 mm, and particularly preferably 1 to 15 mm. When the particle size is 0.1 mm or more, the amount of the collection component impregnated in the core body can be increased. When the particle size is 50 mm or less, molding becomes easy.

As the hydraulic composition forming the coating layer 3, an inorganic material is preferable, and examples thereof include cement and gypsum. The above cements include various Portland cements specified in JIS such as ordinary Portland cement, early-strength Portland cement, moderate heat Portland cement, and low heat Portland cement, blast furnace cement, fly ash cement, slag cement, eco-cement, and alumina cement. And so on.
Among them, ordinary Portland cement and early-strength Portland cement are preferable from the viewpoint of versatility.
These may be used individually by 1 type or in combination of 2 or more type.

If necessary, admixtures such as limestone fine powder, silica fume, fly ash, blast furnace slag, calcium aluminate, and dolomite; fibers made of vinylon, polyethylene, polystyrene, polypropylene, carbon, glass, iron, etc.; Inorganic or organic materials used for quality granules may be used as the material for the coating layer 3.
Further, fine aggregates generally used for concrete and mortar may be used as long as they do not affect the properties of the coating.

Further, in the hydraulic composition, a curing accelerator, a setting retarder, a shrinkage reducing agent, an AE agent, a water reducing agent, and a high amount, which are generally used for cement or concrete as a material for adjusting the curing property. Performance Additives such as water reducing agents, fluidizing agents, thickeners and defoaming agents may be used within a range that does not affect the properties of the coating.
These may be used individually by 1 type or in combination of 2 or more type.
Further, the hydraulic composition contains water. Water is usually mixed with a material other than water immediately before the core body 2 is coated with the hydraulic composition to form a constituent material of the hydraulic composition.

By coating the core body 2 with the hydraulic composition, the aquatic organism collecting granules 1 of the present invention can be obtained.
As a method of coating the core body 2 with the hydraulic composition, (i) a method of charging the core body 2 into a coating device and charging the hydraulic composition while rotating the device.
(Ii) A method in which the core body 2 is charged into a coating device, and the water-hard composition (slurry made by kneading a material other than water and water) is charged into the coating device in advance while rotating the device, (iii). ) A method in which a material other than water constituting the water-hard composition is charged into a coating device, the core body 2 is charged while rotating the device, and water is further charged.
Above all, the method (i) is preferable from the viewpoint of ease of work.
Examples of the coating device include a pan coating device, a rolling coating device, and the like. Above all, a pan coating device is preferable from the viewpoint of work efficiency.
The thickness of the coating layer 3 made of the hydraulic composition is preferably 0.1 to 10 mm, more preferably 0.5 to 7 mm, and particularly preferably 1 to 5 mm. When the thickness is within the above numerical range, the amount of elution of the collection component from the aquatic organism collection granules can be set to an appropriate amount.
By coating the core body 2 with a hydraulic composition and then sufficiently curing the hydraulic composition, the aquatic organism collecting granules 1 of the present invention can be obtained.

The amount of the hydraulic composition used for forming the coating layer 3 is preferably 100 to 1200 parts by mass, more preferably 300 to 1100 parts by mass, and further preferably 600 to 1000 parts by mass with respect to 100 parts by mass of the core body. Parts, more preferably 700 to 950 parts by mass, particularly preferably 800 to 900 parts by mass. When the amount is 100 parts by mass or more, the core body 2 can be sufficiently coated with the hydraulic composition. When the amount is 1200 parts by mass or less, the coating layer 3 can be easily formed.
The particle size of the aquatic organism collecting granules 1 is preferably 0.2 to 60 mm, more preferably 5 to 40 mm, and particularly preferably 10 to 30 mm. When the particle size is 0.2 mm or more, the amount of the collection component contained in the aquatic organism collection granules can be increased. When the particle size is 60 mm or less, the amount of elution of the collection component from the aquatic organism collection granules can be adjusted to an appropriate amount.

By allowing the aquatic organism collecting granules of the present invention to stand in water (for example, in the sea), the collecting components are eluted and diffused from the granules, and the aquatic organisms can be collected.
The aquatic organism collection granules may be used alone, but a cementic hardened material (mortar, concrete) obtained by curing a cement composition containing aquatic organism collection granules, cement, and water is used in water. It may be used in a form of standing still (for example, in the sea).
As the cement, the same cement as that used for the hydraulic composition forming the coating layer 3 described above can be used.
In the above cement composition, the aquatic organism collecting granules can be used as a substitute for the aggregate. When used as a substitute for aggregate, the blending ratio is preferably 5 to 30% by volume, more preferably 10 to 25, based on the total volume of aggregate (including the substitute granules for aquatic organism collection). Volume%.
From the viewpoint of more efficiently eluting the collected components, the hardened cementum preferably has at least a surface-forming portion composed of aquatic organism collecting granules, cement, and a cement composition containing water.

The water area purification system of the present invention includes the above-mentioned granules for collecting aquatic organisms and bivalves arranged in the vicinity of the granules.
The aquatic organism collecting granules of the present invention or the cementum cured product containing the granules is placed in water (for example, in the sea) in a single form or in a container having a water-permeable portion. By allowing it to stand, the collection component is eluted and diffused from the granules. The eluted and diffused collection components are to collect aquatic organisms (for example, crustaceans such as crabs, small animals such as small fish, and benthic organisms such as worms) that ingest excrement (fake feces) from birch shells. Can be done. The collected aquatic organisms can purify the water area by ingesting excrement (pseudo-feces) from bivalves arranged in the vicinity of the aquatic organism collection granules.
The area in the vicinity of the aquatic organism collecting granules is preferably within a radius of 15 m, more preferably within 10 m, still more preferably within 5 m, and particularly preferably within 2 m from the aquatic organism collecting granules. By arranging the bivalves within a radius of 15 m of the aquatic organism collecting granules, the collected aquatic organisms can efficiently ingest the excrement (pseudo-feces) from the bivalves.
Examples of bivalves include scallops, oysters, clams, mussels, clams, freshwater clams, pearl oysters, and mussels.
In addition, since the collection component also serves as a nutrient source for algae and the like, it is possible to form a seaweed bed.

The container provided with the water-permeable portion is not particularly limited as long as it does not allow the aquatic organism collection granules contained in the container to pass through and allows the collection component to pass through. For example, cellulose fiber or polyamide synthetic fiber. , Vinylon fiber, polyester fiber, polyolefin fiber, rayon fiber, aramid fiber, polypropylene fiber, polyethylene fiber and other organic fibers; glass fiber, ceramic fiber, silica fiber, alumina fiber, rock wool, slag wool and other inorganic fibers; etc. A bag made of woven cloth or non-woven fabric using fibers; a container having a storage space formed from a composition obtained by mixing a water-hard composition such as iron, plastic, wood, stone, ceramics, and cement as a raw material can be mentioned. .. The water-permeable portion may be a part of the container or may have water permeability as a whole.

Hereinafter, the water area purification system using the aquatic organism collecting granules of the present invention will be described with reference to FIGS. 2 to 3.
Although FIGS. 2 to 3 show a water purification system in seawater, the system can be installed in fresh water (for example, water of lakes, rivers, etc.) or brackish water.
FIG. 2 is a diagram showing a water area purification system 11 including granules 12 for collecting aquatic organisms and bivalves 14 arranged in the sea 17 by hanging means.
The hanging means includes a hanging support 18 for attaching and growing the bivalve molluscs 14, and a holding body 19 for fixing the hanging support 18 in the sea.
The hanging support 18 only needs to be able to hang the bivalve in the sea. For example, the hanging support for hanging the bivalve as it is, which hangs the seedling collector in which the bivalve is fixed; the basket hanging by putting the bivalve in the aquaculture basket. Support for hanging of ears; Support for hanging of ear hanging by making a hole in a bivalve and hanging it directly through the age pin installed on the hanging rope or by passing Tegs through the hole; For a net with a pocket A hanging support for inserting and fixing a bivalve; a hanging support in which a bivalve is fixed to a rope with a cement-based adhesive can be mentioned.
Among them, the hanging means for fixing the bivalve 14 to the hanging support 18 (for example, a rope) with a cement-based adhesive can secure a space for the bivalve to grow by adjusting the interval between the fixed bivalves, so that the bivalve is in the sea. It is suitable because it can ingest more of the nutritional components of.

Examples of the cement-based adhesive include a slurry of a hydraulic composition containing cement as a main component. Examples of cement used in the water-hardening composition include various Portland cements, blast furnace cements, fly ash cements, slag cements, eco-cements, and alumina cements specified in JIS. Among them, early-strength Portland cement or ordinary Portland cement is preferable from the viewpoint of workability and strength development.
These cements can be used alone, but if desired, aggregates, gypsum, limestone fine powder, dolomite, slag, silica fume, calcium aluminate commonly used in the production of mortar or concrete. It is also possible to mix and use admixtures such as.
The content of cement in the hydraulic composition is preferably 20 to 90% by mass, more preferably 35 to 80% by mass.
In addition, the water-hard composition contains materials other than cement, such as carbonates, sulfates, nitrites, nitrates, chlorides, and hydroxides of alkali metals and alkaline earth metals in order to adjust the curability. You may.
The content of the material other than cement in the hydraulic composition is preferably 0.1 to 10% by mass, more preferably 1 to 7% by mass.
The content of water in the hydraulic composition is preferably 10 to 50% by mass, more preferably 20 to 45% by mass, and more preferably 25 to 40% by mass.

The holding body 19 is not particularly limited as long as the hanging support 18 can be fixed in water, and for example, a raft, a longline, a buoy, etc. used in general hanging-type aquaculture can be used. Can be mentioned.
As the bivalve 14, scallops, oysters, mussels, pearl oysters or blackberry oysters are suitable.

Granular materials 12 for collecting aquatic organisms are arranged on the seabed 16 below the hanging means. The bivalve excrement (pseudofeces) 15 discharged into the sea from the bivalve 14 fixed to the hanging support 18 is deposited around the aquatic organism collecting granules 12.
The aquatic organism 13 can be collected by eluting and diffusing the collection component from the aquatic organism collection granule 12 into the seawater 17. The collected aquatic organisms 13 can purify the seawater 17 by feeding on the bivalve excrement (pseudo-feces) 15 deposited around the aquatic organism collection granules 12.

FIG. 3 is a diagram showing a water area purification system 21 including aquatic organism collecting granules 22 and bivalves 24 and 28 arranged on the seabed 26.
As the bivalves 24 and 28, scallops, oysters, clams, freshwater clams, clams or blackberry mussels are suitable.
The aquatic organism 23 can be collected by eluting and diffusing the collection component from the aquatic organism collection granule 22 into the seawater 27. The collected aquatic organisms 23 can purify the seawater 27 by feeding on the bivalve excrement (pseudo-feces) 25 deposited around the aquatic organism collection granules 22.
By arranging the aquatic organism collecting granules 22 and the bivalves 24 and 28 in this way, the following effects (1) and (2) can be obtained.
(1) Water purification can be carried out even in shallow sea areas where a hanging support cannot be installed.
(2) It is possible to treat nutritional components such as bivalve excrement (pseudo-feces) 25 deposited on the seabed 26.

Hereinafter, the present invention will be specifically described with reference to Examples, but the present invention is not limited to these Examples.
[Example 1]
The crushed material generated during wood cutting in a wood processing factory was sieved with a 3 mm sieve to obtain porous particles. 1 kg of the obtained granules and 3 kg of sorble, which is a soluble protein aqueous solution generated at a fish meal factory as a component for collecting aquatic organisms, are mixed for 2 minutes using a hovert mixer to collect aquatic organisms in the granules. Impregnated with ingredients for
The impregnated granules are granulated using a pan pelletizer having a diameter of 1 m, and then the obtained molded product (molded granulated product) is naturally dried for one day and then sieved to a particle size (grains). A core body (molded granule) having a diameter) of 5 to 10 mm was obtained.

The core body is placed in the above-mentioned pan pelletizer and coated by rotating it while adding ordinary Portland cement (manufactured by Pacific Cement Co., Ltd.) and water as appropriate to obtain granules for aquatic organism collection having a particle size of 15 to 20 mm. Prepared.
The amount of ordinary Portland cement blended with respect to 100 parts by mass of the core body was 800 parts by mass, and the blending amount of water was approximately 200 parts by mass.
Further, 10 granules for collecting aquatic organisms were cut at a plane passing through the center thereof, and the thickness of the coating layer was measured and found to be 4.1 mm on average.
5 kg of the obtained aquatic organism collecting granules are used to have an oyster farming stake (a hanging support (length 8 m) in which oysters are fixed to a rope with a cement-based adhesive, and the hanging support is placed in the sea. It was sprayed on the seabed (water depth of about 12 m) below the cage (fixed to the cage), and after 1 month, the habitat of aquatic organisms around the aquatic organism collection granules was observed.
Table 1 shows the organisms confirmed after spraying the aquatic organisms for collection, and Table 2 shows the number of mainly observed organisms among the confirmed organisms.
Among the confirmed species of organisms classified in the phylum Arthropod, the mainly observed (large number of individuals) organisms were the genus Leptochelia, the genus Benitsuke crab, the genus Gammalopsis, and the genus Alpheus brevicii.
Among the species of organisms classified in the annelid phylum, the mainly observed (large number of individuals) organisms were Nereidae, Otohimegokai, and Nereidae.

[Comparative Example 1]
Granules (particle size: 15 to 20 mm) formed by granulating only the water-hard composition forming the coating layer without using the core body are prepared, and the granules are used instead of the granules for aquatic organism collection. The habitat of aquatic organisms around the granules was observed in the same manner as in Example 1 except that.
Table 1 shows the organisms confirmed after spraying the granules, and Table 2 shows the number of mainly observed organisms among the confirmed organisms.
Among the confirmed species of organisms classified in the phylum Arthropod, the mainly observed (large number of individuals) organisms were the genus Leptochelia, the genus Benitsuke crab, the genus Gammalopsis, and the genus Alpheus brevicii.
Among the species of organisms classified in the annelid phylum, the mainly observed (large number of individuals) organisms were Nereidae and Nereidae.

From Tables 1 and 2, by spraying the aquatic organism collecting granules (Example 1) of the present invention, aquatic organisms such as arthropods and annelids can be collected around them, and as a result, It can be seen that excrement (fake feces) from bivalves (oysters) can be efficiently processed.
On the other hand, when the granules (Comparative Example 1) obtained by granulating only the hydraulic composition are sprayed, the number of arthropods, annelids, etc. gathered around the granules is smaller than that of the examples. I understand.

1 Aquatic organism collection granules 2 Core body 3 Coating layer 11,21 Water purification system 12,22 Aquatic organism collection granules 13,23 Aquatic organisms 14,24 Bivalves (oysters)
15,25 Bivalve excrement (fake feces)
16,26 Seabed 17,27 Seawater 18 Suspension support 19 Reservoir 28 Bivalve (clams)

Claims (3)

After impregnating a plurality of porous granules with a component for collecting aquatic organisms and then molding the plurality of the above-mentioned granules to obtain a core body which is a molded granule having a particle size of 50 mm or less. An aquatic organism collection granule, which comprises forming a coating layer having a thickness of 0.1 to 10 mm and having a water-hard composition on the surface of the core body to obtain an aquatic organism collection granule. Manufacturing method . The method for producing aquatic organism collecting granules according to claim 1, wherein the component for collecting the aquatic organism is an amino acid, a peptide, or a protein. The invention according to claim 1 or 2, wherein the granular material of the porous body is 5 mm or less, the particle size of the core body is 1 to 20 mm, and the particle size of the aquatic organism collecting granule is 5 to 30 mm. A method for producing granules for aquatic organism collection.

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