JP2017063785A - Granules for gathering aquatic organisms and cleaning system for area of water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide granules for gathering aquatic organisms which can gather aquatic organisms and a system that can clean an area of water by efficiently treating excreta (pseudofeces) from bivalves.SOLUTION: The granules for gathering aquatic organisms 1 comprise: a core body 2 obtained by impregnating porous granules with a component for collecting aquatic organisms; and a coating layer 3 formed on the surface of the core body 2 and composed of a hydraulic composition. The cleaning system for an area of water comprises bivalves arranged in the granules for gathering aquatic organisms 1 and the vicinity of the granules for gathering aquatic organisms 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an aquatic organism collecting particle and a water purification system.

In recent years, in the coastal waters of Japan, the number of seaweed beds and tidal flats has been decreasing due to the occurrence of firewood burning and land reclamation due to coastal development. Seaweed beds have the function of absorbing phosphorus, nitrogen and other substances that cause eutrophication, and tidal flats have the function of buffering the inflow of nutrients from the land. However, due to the decrease in seaweed beds and tidal flats, eutrophication in the sea has progressed, so-called red tides have occurred due to abnormal growth of plankton, and there is a problem of adversely affecting fisheries and aquaculture.
As one of the measures for solving these problems, a method of purifying the water area (water quality) using bivalves such as oysters and clams has been studied. The bivalve is composed of phytoplankton that grows with nutrients such as phosphorus and nitrogen in water, zooplankton that grows using the phytoplankton as feed, and nutritional components such as 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. For example, Patent Document 1 discloses a suspended organic substance that is suspended by hanging a string-like material having a large number of dispersed yarns in seawater or fresh water, and selectively attaching a large amount of bivalve that adheres to foot threads to the dispersed yarn. A method for purifying seawater or fresh water is described, characterized in that it is fed and grown and recovered on land.

  On the other hand, in the aquaculture field, a method for preventing oysters from being killed by organic substances such as pollutants and toxic gases generated from fish and shellfish excrement in the oyster drooping culture has been studied. For example, Patent Literature 2 is characterized in that, in a culture method in which oyster seeded larvae are suspended, seawater is purified and a bamboo charcoal mat is laid on the cultured oysters as a means for reducing the death of the cultured oysters. The aquaculture method is described.

Japanese Patent No. 3013314 JP 2004-105081 A

The bivalve does not digest and absorb all the nutritional components that it eats, and the nutrients that it consumes more than necessary are discharged in the form of solids called “fake feces” by mucus. The discharged pseudofeces fall on the seabed, and then serve as feed for aquatic organisms (for example, crustaceans such as crabs, small animals such as small fish, and benthic organisms such as sandworms).
In the method described in Patent Document 1, when fake feces are discharged excessively, nutrient components accumulate in the sea (particularly the seabed), resulting in eutrophication, which degrades the environment in the sea (particularly the seabed). Is concerned. Further, in the method described in Patent Document 2, labor for laying the bamboo charcoal mat is required, the position of the bamboo charcoal mat is shifted or slack due to the influence of waves and ocean currents, When suspended matter or sand accumulates on top, there is a problem that excrement (pseudofeces) cannot be adsorbed efficiently and its effect is reduced.
Accordingly, an object of the present invention is to provide a system capable of efficiently treating the agglomerates that can collect aquatic organisms and excrement (fake feces) from bivalves and purifying the water area. It is to be.

As a result of intensive studies to solve the above problems, the present inventors have obtained a core body obtained by impregnating porous granules with a component for collecting aquatic organisms, and the surface of the core body It was found that the aquatic organism collecting granules comprising a coating layer made of a hydraulic composition formed in the above can achieve the object of the present invention, and the present invention has been completed.
That is, the present invention provides the following [1] to [10].
[1] A core body formed by impregnating porous granules with components for collecting aquatic organisms, and a coating layer made of a hydraulic composition formed on the surface of the core body. A characteristic aquatic organism collection particle.
[2] The aquatic organism collecting granule according to [1], wherein the component for collecting the aquatic organism is an amino acid, a peptide, or a protein.
[3] The granule for collecting aquatic organisms according to [1] or [2], wherein the core body has a particle size of 50 mm or less and the coating layer has a thickness of 0.1 to 10 mm.

[4] Water body purification comprising the aquatic organism collecting granules according to any one of [1] to [3], and a bivalve arranged in the vicinity of the aquatic organism collecting granules. system.
[5] The water purification system according to [4], wherein the bivalve is disposed in water by a drooping means.
[6] The water purification system according to [5], wherein the drooping means includes a drooping support and a cement-based adhesive for fixing the bivalve to the drooping support.
[7] The water purification system according to [4], wherein the bivalve is disposed on the bottom of the water.
[8] The water purification system according to any one of [4] to [7], wherein the bivalve is a scallop, oyster, mussel, pearl oyster, clam, swordfish, clam or cypress.
[9] A cement composition comprising the aquatic organism collecting granules according to any one of [1] to [3], cement, and water.
[10] A hardened cementitious body, wherein at least the surface forming portion is made of the cement composition according to [9].

According to the particles for collecting aquatic organisms of the present invention, aquatic organisms can be collected.
Moreover, according to the water area purification system of the present invention, by collecting aquatic organisms, the excrement (fake feces) from the bivalve is efficiently processed, the water area is purified, and the eutrophication of the water area is suppressed. be able to.

It is sectional drawing which shows typically the state which cut | disconnected the granule for aquatic organism collection of this invention by the cut surface which passes along the center of this granule. It is a figure which shows an example of the water purification system of this invention containing the granule for aquatic organism collection, and the bivalve arranged in the sea by the drooping means. It is a figure which shows the other example of the water area purification system of this invention containing the granule for aquatic organism collection, and the bivalve arrange | positioned on the seabed.

Hereinafter, the granule for collecting aquatic organisms of the present invention will be described in detail with reference to FIG.
The aquatic organism collecting granule 1 of the present invention comprises a core body 2 obtained by impregnating porous granules with a component for collecting aquatic organisms (hereinafter also referred to as “collecting component”), and It includes a coating layer 3 made of a hydraulic composition and formed on the surface of the core body.
The collecting component refers to a component that can collect aquatic organisms. Specifically, 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 Peptides or proteins containing the amino acid as a constituent component.
The collecting component may be used alone or in combination of two or more.
In the present invention, for example, boiled juice or the like can be used as containing two or more collected components.

The porous particles only need to be made of a material that can be impregnated with a collecting component, and both inorganic materials and organic materials can be used.
In the present invention, by using porous particles, the impregnable amount of the collecting component can be increased and the time required for impregnation can be shortened.
Examples of inorganic materials include shale, pumice, volcanic zeolite, diatomaceous earth, shirasu, vermiculite, calcium carbonate-containing substances (limestone, shells, eggshells, etc.), and burned products thereof; Pulverized and crushed products of calcium silicate compounds; pulverized and crushed products of calcium silicate compounds foamed with aluminum powder; baked products obtained by pulverizing pearlite and obsidian and then firing them; bricks, ceramics, etc. Examples include crushed materials.
Examples of the organic material include foamed synthetic resins such as polyurethane, polyethylene, polystyrene, polyvinyl chloride, and polyvinyl alcohol; natural and artificial rubbers; crushed materials of wooden materials, and the like.
The kind of wood in the wood material is not particularly limited. Moreover, sawdust generated at the time of cutting wood, cut off material generated at the time of plywood production, construction waste material, crushed material such as wood generated by thinning, etc. can be used as the wood material.

  The porous particles may be used without adjusting the particle size (particle size when the particles are spherical, or longitudinal dimension when the particles are rod-shaped), and the particle size falls within a specific range depending on the purpose. You may adjust and use as follows. The particle size varies depending on the shape of the granule, but is preferably 50 mm or less, more preferably 30 mm or less, from the viewpoint of sufficiently immersing the collected component into the granule during impregnation. In addition, 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 molding described later.

By impregnating the porous particle with the collection component, the collection component is impregnated from the plurality of pores of the porous particle, and the core body 2 having the collection component inside can be obtained.
Examples of the method of impregnating the porous particles with the collection component include, for example, a method of immersing the particles in a liquid material containing the collection component and water for a certain period of time, and using a mixer for the liquid material and the particles. And kneading. Especially, the method of kneading using a mixer is preferable from the viewpoint of sufficiently immersing the liquid material in a short time.
The mixer is not particularly limited, and a mixer that is generally used in mixing the granules (for example, a mixer used for kneading mortar or concrete) may be used.
Specific examples include a vertical mixer, a horizontal mixer, a nauter mixer, a tilting cylinder mixer, a forced mixer, and a biaxial mixer. Examples of the vertical mixer include “Hobart mixer” manufactured by Hobart, “Henschel mixer” manufactured by Henschel, and the like. As the horizontal mixer, for example, “Redige Mixer” manufactured by Redige Corporation can be used.
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 be impregnated.

The liquid substance containing the collection component and water is an aqueous solution or suspension obtained by mixing the above-described collection component and water by appropriately adjusting the blending ratio according to the application. As the liquid, it is also possible to use boiled juice discharged in the food processing industry or the fishery processing industry.
In addition, the liquid material includes, as other components, main components of inorganic fertilizer such as nitrogen, phosphorus, potassium, magnesium, silicon, sulfur, iron, copper, zinc, nickel, manganese, cobalt, molybdenum, The trace amount component of inorganic fertilizer, etc. may be contained in an amount within a range not affecting 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 of easy molding of the granule after impregnation and the core body 2 after molding does not collapse, Preferably it is 10-400 mass parts with respect to 100 mass parts, More preferably, it is 50-300 mass parts.

The granules impregnated with the collected components may be used as they are as the core body 2 in the present invention, but from the viewpoint of obtaining the aquatic organism collected granules 1 sufficiently impregnated with the collected components, the collected components are impregnated. It is preferable to use as the core body 2 a molded product (molded granulated product) formed by molding a granular body.
Various granulation methods such as rolling granulation, stirring granulation, compression granulation, and extrusion granulation can be used as a method for producing the molded product (molded granulated product). Moreover, a pan pelletizer, a mixer, a disk pelleter, etc. can be used as an apparatus used for granulation.
Moreover, when performing shaping | molding, you may add a binder as needed.
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 collected components impregnated in the core body can be increased. If the particle size is 50 mm or less, molding becomes easy.

The hydraulic composition forming the coating layer 3 is preferably an inorganic material, and examples thereof include cement and gypsum. Examples of the cement include ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, low heat Portland cement, and other varieties of Portland cement, blast furnace cement, fly ash cement, slag cement, eco cement, and alumina cement. Etc.
Of these, ordinary portland cement and early-strength portland cement are preferred from the viewpoint of versatility.
These may be used alone or in combination of two or more.

If necessary, admixtures such as fine limestone powder, silica fume, fly ash, blast furnace slag, calcium aluminate, dolomite; fibers made of vinylon, polyethylene, polystyrene, polypropylene, carbon, glass, iron, etc .; porous as described above Inorganic and organic materials used for the quality particles may be used as the material for the coating layer 3.
Further, fine aggregates generally used in concrete or mortar may be used within a range that does not affect the properties of the coating.

In addition, the hydraulic composition includes a curing accelerator, a setting retarder, a shrinkage reducing agent, an AE agent, a water reducing agent, a high curing agent, which are generally used for cement or concrete as a material for adjusting the curing property. You may use additives, such as a performance water reducing agent, a fluidizing agent, a thickener, an antifoamer, in the range which does not affect the property of coating | cover.
These may be used alone or in combination of two or more.
Further, the hydraulic composition includes water. Water is usually mixed with a material other than water just before the core body 2 is coated with the hydraulic composition, and becomes a constituent material of the hydraulic composition.

By covering the core body 2 with a 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 a hydraulic composition, (i) a method in which the core body 2 is put into a coating apparatus, and the hydraulic composition is put in and coated while rotating the apparatus;
(Ii) A method in which a core composition 2 is charged into a coating apparatus and a hydraulic composition (a slurry obtained by kneading water and a material other than water) is charged into the coating apparatus in advance while rotating the apparatus, (iii) ) Examples include a method in which a material other than water constituting the hydraulic composition is charged into a coating apparatus, the core body 2 is charged while the apparatus is rotated, and water is further charged.
Among these, the method (i) is preferable from the viewpoint of workability.
Examples of the coating apparatus include a pan coating apparatus and a rolling coating apparatus. Among these, a pan coating apparatus 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. If the thickness is within the above numerical range, the amount of the collected component eluted from the aquatic organism collecting particles can be adjusted to an appropriate amount.
The core body 2 is covered with a hydraulic composition, and then the hydraulic composition is sufficiently cured, whereby 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 even more 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 covered 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 particles 1 is preferably 0.2 to 60 mm, more preferably 5 to 40 mm, and particularly preferably 10 to 30 mm. If the particle size is 0.2 mm or more, the amount of collected components contained in the aquatic organism collecting particles can be increased. If this particle size is 60 mm or less, the elution amount of the collected component from the aquatic organism collecting particles can be adjusted to an appropriate amount.

By allowing the particles for collecting aquatic organisms of the present invention to stand in water (for example, in the sea), the collected components are eluted and diffused from the particles, and aquatic organisms can be collected.
The aquatic organism collection granules may be used alone, but a cementitious hardened body (mortar, concrete) obtained by curing a cement composition containing aquatic organism collection granules, cement, and water is used in water. You may use it with the form left still (for example, in the sea).
As cement, the thing similar to the cement used for the hydraulic composition which forms the coating layer 3 mentioned above can be used.
In the above cement composition, the aquatic organism collecting granules can be used as an alternative to aggregates. When used as a substitute for aggregate, the blending ratio is preferably 5 to 30% by volume, more preferably 10 to 25% in the total volume of aggregate (including aquatic organism collecting granules as a substitute). % By volume.
From the viewpoint of more efficiently eluting the collected components, the hardened cementitious material is preferably composed of a cement composition containing at least a surface-forming particle, cement, and water.

The water area purification system of the present invention includes the above-mentioned aquatic organism collecting granules and a bivalve arranged in the vicinity of the granules.
The aquatic organism collecting granule of the present invention or the cementitious hardened body containing the granule is submerged in water (for example, in the sea) or the like in a single form or in a form containing a water-permeable portion. By allowing to stand, the collected components are eluted and diffused from the granules. The elution and diffusion of collected components collects aquatic organisms (for example, crustaceans such as crabs, small animals such as small fish, and benthic organisms such as sea bream) that ingest excrement (fake feces) from bivalves. Can do. The collected aquatic organisms can purify the water area by ingesting excrement (fake feces) from bivalves arranged in the vicinity of the aquatic organism collecting particles.
The area in the vicinity of the aquatic organism collecting particles 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 particles. By arranging the bivalves within a radius of 15 m of the aquatic organism collecting particles, the collected aquatic organisms can efficiently ingest excrement (fake feces) from the bivalves.
Examples of the bivalves include scallops, oysters, clams, blue mussels, clams, swordfish, pearl oysters, and cypress shells.
Moreover, since the collected component also serves as a nutrient source for algae and the like, it is possible to form a seaweed bed.

  The container having a water-permeable portion is not particularly limited as long as the aquatic organism collecting particles contained in the container do not pass through and the collected components pass through. For example, cellulose fibers, polyamide synthetic fibers Organic fibers such as vinylon fiber, polyester fiber, polyolefin fiber, rayon fiber, aramid fiber, polypropylene fiber, polyethylene fiber; inorganic fiber such as glass fiber, ceramic fiber, silica fiber, alumina fiber, rock wool, slag wool; etc. Examples include bags made of woven or non-woven fabrics using fibers; containers holding storage spaces formed from raw materials composed of a mixture of hydraulic compositions such as iron, plastic, wood, stone, ceramics, and cement. . The part having water permeability may be a part of the container or may have water permeability as a whole.

Hereinafter, a water purification system using the aquatic organism collecting particles of the present invention will be described with reference to 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 an aquatic purification system 11 including aquatic organism collecting granules 12 and bivalves 14 arranged in the sea 17 by drooping means.
The drooping means includes a drooping support 18 for growing the bivalve shell 14 attached thereto, and a holding body 19 for fixing the drooping support 18 in the sea.
The suspension support 18 only needs to be able to hang a bivalve into the sea. For example, a bare suspension support that suspends a seedling device with a bivalve anchored as it is; Suspension support body; Suspension support body for hanging ears by drilling holes in bivalves and hanging them together on the age pin installed on the suspension rope or through a pair of tees through the hole; For nets with pockets A support for drooping in which a bivalve is put and fixed; a support for drooping in which a bivalve is fixed to a rope with a cement adhesive, and the like.
Among them, the drooping means for fixing the bivalve shell 14 to the support 18 for hanging (for example, a rope) with cement adhesive can secure a space for the bivalve growth by adjusting the interval of the bivalve to be fixed. It is preferable because it can ingest more nutrient components.

Examples of the cement-based adhesive include a slurry of a hydraulic composition mainly composed of cement. Examples of the cement used in the hydraulic composition include various Portland cements, blast furnace cements, fly ash cements, slag cements, eco cements, and alumina cements defined in JIS. Among these, from the viewpoint of workability and strength development, early-strength Portland cement or ordinary Portland cement is preferable.
These cements can be used alone, but if necessary, 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 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 hydraulic 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. May be.
The content of materials 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 it can fix the hanging support 18 in water. For example, a cage, a long line, a buoy and the like used in general hanging culture are used. Can be mentioned.
As the bivalve 14, scallops, oysters, mussels, pearl oysters or cypress shells are suitable.

The aquatic organism collecting granules 12 are disposed on the seabed 16 below the drooping means. The bivalve excrement (fake feces) 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 organisms 13 can be collected by elution and diffusion of the collected components into the seawater 17 from the aquatic organism collecting particles 12. The collected aquatic organisms 13 feed on the bivalve excrement (fake feces) 15 accumulated around the aquatic organism collecting granules 12, whereby the seawater 17 can be purified.

FIG. 3 is a diagram showing a water purification system 21 including aquatic organism collecting granules 22 and bivalves 24 and 28 disposed on the seabed 26.
As the bivalves 24 and 28, scallops, oysters, clams, swordfish, clams or scallops are suitable.
The aquatic organisms 23 can be collected by elution and diffusion of the collected components into the seawater 27 from the aquatic organism collecting particles 22. The collected aquatic organisms 23 feed on the bivalve excrement (fake feces) 25 deposited around the aquatic organism collecting granules 22, whereby the seawater 27 can be purified.
The following effects (1) to (2) can be obtained by installing the aquatic organism collecting particles 22 and the bivalves 24 and 28 in this way.
(1) Water area purification can be carried out even in a shallow sea area where a support for drooping cannot be installed.
(2) Nutritional components such as bivalve excrement (fake feces) 25 deposited on the sea floor 26 can be treated.

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.
[Example 1]
A pulverized product generated at the time of cutting wood in a wood processing factory was sieved with a 3 mm sieve to obtain porous granules. 1 kg of the obtained granules and 3 kg of Soluble, which is a soluble protein aqueous solution generated in a fish meal plant as a component for collecting aquatic organisms, are mixed for 2 minutes using a Hobart mixer to collect aquatic organisms in the granules. Ingredients for impregnation were impregnated.
The impregnated granule is 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 obtain a particle size (grain A core body (molded granulated product) having a diameter of 5 to 10 mm was obtained.

The core body is placed in the above-described pan pelletizer, and is rotated while appropriately adding ordinary Portland cement (manufactured by Taiheiyo Cement Co., Ltd.) and coated to obtain aquatic organism collecting granules having a particle size of 15 to 20 mm. Prepared.
In addition, the compounding quantity of normal Portland cement with respect to 100 mass parts of core bodies was 800 mass parts, and the compounding quantity of water was about 200 mass parts.
In addition, 10 aquatic organism collecting granules were cut along a plane passing through the center thereof, and the thickness of the coating layer was measured. The average thickness was 4.1 mm.
5 kg of the obtained aquatic organism trapping granules were provided with a oyster culturing pod (support for suspending (8 m in length) in which oysters were fixed to a rope with a cement adhesive), and the suspending support was It was sprayed on the sea bottom (water depth of about 12 m) below the holding body fixed to the surface of the aquatic organisms, and after one month, the aquatic organisms around the aquatic organism collecting particles were observed.
Table 1 shows the organisms confirmed after spraying the aquatic organism collection particles, and Table 2 shows the observed number of organisms among the confirmed organisms.
Of the types of organisms classified into the confirmed arthropoda, the organisms that were observed mainly (the number of individuals was large) were Leptochelia genus, red crabs, Gammaropsis genus, and Sawagi teppo webi.
In addition, among the types of organisms classified as annelids, the organisms that were observed mainly (the number of individuals was large) were Himegokai, Otohimegokai, and Gokai.

[Comparative Example 1]
A granule (particle size: 15 to 20 mm) formed by granulating only the hydraulic composition forming the coating layer without using the core body is prepared, and the granule is used instead of the aquatic organism collecting granule. In the same manner as in Example 1 except for using the aquatic organisms, the aquatic life around the granules was observed.
Table 1 shows the organisms confirmed after spraying the granules, and Table 2 shows the number of organisms observed mainly among the organisms confirmed.
Of the types of organisms classified into the confirmed arthropoda, the organisms that were observed mainly (the number of individuals was large) were Leptochelia genus, red crabs, Gammaropsis genus, and Sawagi teppo webi.
In addition, among the types of organisms classified as annelids, the organisms that were observed mainly (the number of individuals was large) were Otohimegokai and Gokaiidae.

From Table 1 and Table 2, by spraying the aquatic organism collecting particles of the present invention (Example 1), it is possible to collect aquatic organisms such as arthropods and annelids around it, and as a result, It turns out that the excrement (fake feces) from a bivalve (oyster) can be processed efficiently.
On the other hand, when spraying granules (Comparative Example 1) formed by granulating only the hydraulic composition, the number of individuals such as arthropods and annelids collected in the vicinity is small compared to the Examples. I understand.

DESCRIPTION OF SYMBOLS 1 Granule for aquatic organism collection 2 Core body 3 Enveloping layer 11,21 Water purification system 12,22 Granule for aquatic organism collection 13,23 Aquatic organism 14,24 Bivalve (oyster)
15, 25 Bivalve excrement (fake feces)
16, 26 Seabed 17, 27 Seawater 18 Support for drooping 19 Holding body 28 Bivalve (clam)

Claims (10)

  A core body formed by impregnating porous particles with components for collecting aquatic organisms, and a coating layer formed on the surface of the core body and made of a hydraulic composition, Granules for collecting aquatic organisms.   The granule for collecting aquatic organisms according to claim 1, wherein the component for collecting the aquatic organisms is an amino acid, a peptide, or a protein.   3. The aquatic organism collecting granule according to claim 1, wherein the core body has a particle size of 50 mm or less, and the coating layer has a thickness of 0.1 to 10 mm.   An aquatic purification system comprising: the aquatic organism collecting granules according to any one of claims 1 to 3; and a bivalve arranged in the vicinity of the aquatic organism collecting granules.   The water purification system according to claim 4, wherein the bivalve is disposed in water by drooping means.   The water area purification system according to claim 5, wherein the drooping means includes a drooping support and a cement-based adhesive for fixing the bivalve to the drooping support.   The water purification system according to claim 4, wherein the bivalve is disposed on the bottom of the water.   The water area purification system according to any one of claims 4 to 7, wherein the bivalve is a scallop, oyster, mussel, pearl oyster, clam, swordfish, clam or cypress.   A cement composition comprising the aquatic organism collecting granules according to any one of claims 1 to 3, cement, and water. A cementitious hardened body, wherein at least the surface-forming portion comprises the cement composition according to claim 9.

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