JP2016202033A - Algae cultivation facility and algae cultivation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an algae cultivation facility and an algae cultivation method utilizing the facility in which an installing process does not become complex, a structure is simple, and land can be effectively utilized.SOLUTION: There is provided an algae cultivation facility utilizing rice paddy in which grooves for conveying water into which algae being cultivated are mixed are formed inside a plane surrounded by ridges in a rice paddy.SELECTED DRAWING: Figure 2

Description

The present invention relates to an algae cultivation facility using paddy fields, and more particularly, to an algae cultivation facility that has a simple structure and can effectively use land, without complicated installation processes, and an algae cultivation method using the facility.

  In recent years, algae (particularly microalgae) that can produce biofuels (hydrocarbons and biodiesel) and physiologically active substances such as astaxanthin have attracted attention. It has been studied to cultivate such algae in large quantities and to use the output as energy instead of oil, or to use it for medicines, cosmetics, foods, and the like.

  In the past, various devices and systems for efficiently cultivating (or culturing) such algae have been studied and proposed. For example, Patent Document 1 (Japanese Patent Application Laid-Open No. 08-173139) proposes a microalgae mass culture system for efficiently culturing high-quality microalgae in large quantities. That is, a mass culture system for cultivating microalgae in a large amount while supplying carbon dioxide in a culture solution, wherein a stirrer is disposed in a closed water tank made of a light transmitting material, and the stirrer The air inlet portion of the diffuser pipe constituting the air tank and the air outlet of the water tank are connected by a circulation pipe having a pump interposed therebetween, and carbon dioxide is supplied from the carbon dioxide supply source through a regulating valve in the middle of the circulation pipe. A culture apparatus formed by connecting a supply pipe for supplying the culture medium, and circulating a mixed solution of the culture solution and the microalgae through the culture device and a culture pond for mass culture provided separately from the culture device A pipe is connected in a ring shape, and is switched between a non-connected state in which the mixed solution in the culture pond is not supplied to the culture apparatus and a connected state in which the mixed solution in the culture pond is supplied to the culture apparatus and circulated in the middle of the pipe. Opening / closing means capable of When the open / close means is in the connected state, the culture device is mixed with carbon dioxide in the culture pond and the activity of the microalgae growth function. A large-scale culture system for microalgae, which is characterized in that it is configured to be used for conversion, has been proposed.

  Patent Document 2 (Japanese Patent Application Laid-Open No. 2008-022740) proposes an algae cultivation apparatus that can improve the efficiency of algae cultivation by supplying carbon dioxide to seawater, and can solve problems caused when carbon dioxide is supplied. Has been. That is, a cultivation tank for storing seawater and cultivating algae, a carbon dioxide supply mechanism for supplying carbon dioxide to the seawater in the cultivation tank, and an electrolysis mechanism for electrolyzing the seawater in the cultivation tank Algae cultivation equipment has been proposed.

  On the other hand, in recent years, the aging of the agricultural working population and the increase in abandoned cultivated land have progressed, and there is a need to create a foundation that enhances land productivity and labor productivity. For example, paddy fields can be cited as abandoned cultivated land. If the paddy field is left unattended, weeds grow, and it takes a lot of labor to restore the field. However, problems such as a decline in the water storage function and ecosystem maintenance function inherent in paddy fields, or loss of the landscape arise. However, it takes a lot of cost to restore Fuda, and there are cases where usage is limited from the viewpoint of structural reasons and legal reasons.

Therefore, in the past, methods for producing high value-added products by cultivating algae as described above using such fallow fields have been studied and proposed. That is, Patent Document 3 (Japanese Patent Application Laid-Open No. 2002-125658) proposes a method for utilizing a fallow rice field that can make Futa easy and produce a high value-added product while retaining the function of a paddy field. There has been proposed a method for utilizing a fallow field characterized by culturing microalgae in a fallow field under the condition of a paddy field.

Japanese Patent Laid-Open No. 08-173139 JP 2008-022740 A JP 2002-125658 A

  As described above, an apparatus (or system) for cultivating algae efficiently has been proposed, and a method for culturing algae using a fallow rice field has also been proposed. However, in patent document 1, since it is necessary to comprise a culture apparatus and a culture pond separately, since an installation process becomes complicated and a large land is needed, it is desirable also from a viewpoint of effective use of land. It was not a thing.

  Accordingly, the first object of the present invention is to provide an algae cultivation facility and an algae cultivation method that can simplify the structure and effectively use the land without complicating the installation process.

  Moreover, in patent document 2, the electrolysis mechanism for electrolyzing seawater is required, and when cultivating using a wide area in order to grow a lot of algae, the capital investment accompanying it is required Therefore, there is a possibility that a great cost is required.

  Therefore, in the present invention, in order to cultivate a large amount of algae, a second problem is to provide an algae cultivation facility and algae cultivation method capable of suppressing the cost as much as possible even when cultivating a wide range of land. And

  Furthermore, Patent Document 3 proposes a method for cultivating algae using the paddy field as it is. However, when the paddy field is used in an exposed state, it is cultivated by the influence of wind and rain, hot air in the summer, etc. There was a possibility that the amount of water for the production would vary and affect the growing state of the cultivated algae. Further, in the literature 3, it is also proposed to use a partition plate made of concrete so that water flows back in the area where the periphery of the paddy field is partitioned by walls, but when using concrete, Installation, restoration, and removal work become difficult, and from the viewpoint of the Agricultural Land Law, there is a possibility that there is a limit to firmly fixing the soil surface with concrete.

Therefore, in the present invention, when cultivating algae, it is not affected by wind and rain as much as possible, and is configured so that water for algae cultivation flows appropriately, so that the work can be simplified when installing, repairing and removing. It is a third problem to provide a configured algae cultivation facility and algae cultivation method.

  In order to solve at least one of the above problems, the present invention provides a highly functional algal cultivation facility and an algal cultivation method using the algal cultivation facility by effectively utilizing existing paddy fields. That is, the present invention is an algae cultivation facility using paddy fields, characterized in that a groove for transporting water mixed with algae to be cultivated is formed in a plane surrounded by straw in the paddy field. The algae cultivation facility is provided.

≪Advantages of using paddy fields≫
The paddy field used in the present invention refers to a farmland partitioned for cultivating cereals, is currently used for agricultural production, and is in a non-cultivated state such as fallow or abandoned cultivation that is not used for agricultural production. Widely includes paddy fields. Especially in the algae cultivation facility according to the present invention, it is possible to use a non-cultivated paddy field that is not currently used for agricultural production. Therefore, the existing irrigation channel network can be used, and there is no need to establish a new facility for water supply and drainage.

  In addition, since the farm is being maintained, the horizontality within each section is secured, the surface drainage is good even during rainfall, and the field structure and geology are relatively uniform. Formability is good also in forming the groove in the invention.

  As a result, by using existing paddy fields, it is not necessary to newly establish equipment used for water supply and drainage, or to perform land preparation from scratch, so the period and cost for constructing the algal cultivation facility are greatly increased. Can be reduced.

≪Specific configuration of algae cultivation facility≫
<Algae to grow>
In the present invention, a facility for cultivating algae using the paddy field is provided. Algae here refers to plants that inhabit mainly in water and wetlands and have pigments such as chlorophyll in the body and operate autotrophic. It is a concept that broadly includes unicellular organisms (diatoms, yellow green algae, dinoflagellates, etc.) and seaweeds (red algae, brown algae, green algae, etc.) that are multicellular organisms. The algae can be used for food as it is, or can be used in a wide range of fields, for example, by extracting the components and using them as nutritional components for other plants or as energy alternative to oil.

<Groove formation method>
In order to cultivate the algae, in the algae cultivation facility according to the present invention, a groove for transporting water mixed with the algae to be cultivated is formed in the plane surrounded by the straw in the paddy field. Since the groove only needs to be able to transport water mixed with algae to be cultivated, there is no particular limitation on the shape to be formed. The shape of the groove is, for example, formed so that the cross-sectional shape perpendicular to the length direction is V-shaped, or a curved U-shape, or a flat portion on the bottom surface of the medium and the wall surface is inclined. It can also be formed in a “U” shape. In the algae cultivation facility concerning this invention, it can be made to function as a water channel for algae cultivation by forming the said groove | channel with respect to the surface surrounded by the straw in a paddy field. That is, by utilizing the existing paddy field and making the formed groove function as a water channel, carbon dioxide can be easily taken in and nutrients can be distributed uniformly. Furthermore, the collection work can be facilitated, and algae can be cultivated by using a wide variety of paddy fields, so that a large amount of algae can be cultivated.

  In addition, since horizontality is ensured by using paddy fields, for example, when forming a plurality of such grooves side by side in the horizontal direction or when bending and forming in an "S" shape in the horizontal direction The water head difference for algae cultivation can be reduced. In other words, by using the paddy field to form the groove, it is possible to reduce the water head difference for algae cultivation arranged in the horizontal direction and to suppress the load to supply water as much as possible. The burden on the equipment can be reduced.

  Further, by forming the groove in the plane surrounded by the straw in the paddy field, it becomes possible to reduce the influence of wind and rain from the horizontal direction as much as possible.

<Groove reinforcing method>
In the algal cultivation facility according to the present invention, a groove is formed as described above to function as a water channel for algae cultivation, but the wall surface of the groove is preferably reinforced by a reinforcing member. This is because the wall surface of the groove is reinforced by a reinforcing member, so that the wall surface of the groove can be prevented from collapsing due to wind and rain, etc., and invasion of small animals and insects or penetration of plant roots can be prevented. This is because it can be maintained over a long period of time.

  The reinforcing member can be composed of, for example, a bottom surface forming member that shapes the bottom surface of the medium partitioned from the soil and a slope surface forming member that shapes the side surface of the medium partitioned from the soil. It is desirable that the bottom surface component member has a certain hardness in order to determine the bottom surface. For example, band-shaped members selected from wood, metal, resin, concrete, processed paper, and the like can be combined and formed such that the width of the band-shaped member is in the direction of the height of the bottom surface component. In that case, it can form by combining the said strip | belt-shaped member in a grid | lattice form, or arrange | positioning a strip | belt-shaped member in a wave shape in parallel, and bonding the curved bending part of an adjacent strip | belt-shaped member.

  In addition, the slope-constituting member, like the bottom surface-constituting member, combines the strip-shaped members in a lattice shape, or arranges the strip-shaped members in a wavy shape and arranges them in parallel, and the curved bent portions of the adjacent strip-shaped members are arranged together. A bonded part can be used, but in addition, a flat part formed in a strip shape or a plate shape, and a wall part protruding toward the outside in the thickness direction of the flat part on any surface of the flat part It is possible to use the wall portion configured to form an area portion for storing earth and sand at the time of installation. By using the slope-constituting member, the side surface of the groove is shaped by the slope-constituting member, so that it is possible to eliminate the possibility that the side wall of the groove will collapse due to weathering, rainwater, or the like.

In particular, in a slope component composed of a flat part and a wall part, since it is formed using the flat part, it is possible to prevent the invasion of animals such as rats and snakes or the roots of plants into the groove. it can. Thereby, even if it is a case where a waterproof sheet etc. is stretched and provided in the boundary of the said groove | channel and soil, a possibility that a hole may be made in this waterproof sheet etc. or torn can be eliminated. Furthermore, since a wall portion protruding toward the outer side in the thickness direction of the flat portion is formed on any surface of the flat portion, the slope component member is formed in the region portion formed by the wall portion. By holding the earth and sand of the soil in which the wall is installed, problems such as collapse of the wall surface (slope) can be eliminated.

  Each component of the reinforcing member (that is, the bottom component, the slope component, etc.) can be formed using a hard member such as concrete, but a hard sheet member (for example, hard vinyl chloride) ), Which has suitable pores and is preferably formed so as not to impede the passage of moisture on both sides of the hard sheet. As a result, there is no restriction due to regulations such as the Agricultural Land Law, and there is no significant difference in the moisture content of the soil on both sides of each component of the reinforcing member (ie, bottom component, slope component, etc.). Is less likely to occur, the pressure change in the soil is small, and the position change of each constituent member (that is, the bottom constituent member, the slope constituent member, etc.) of the reinforcing member can be reduced.

  In addition, each constituent member of the reinforcing member to be embedded (that is, the bottom constituent member, the slope constituent member, etc.) has a frictional force acting in the horizontal direction of the cross-sectional shape, so there is no breakage or deformation of the joint or material in each member. Resist the vertical load in the range and maintain the molded shape.

  That is, the bottom surface and the slope of the groove can be effectively shaped by providing the reinforcing member formed as described above on the bottom and the slope of the groove formed by shaping the soil into a concave shape. At the same time, collapse due to weathering or rain can be prevented, and further, problems such as the roots of animals and plants such as moths and snakes can enter the groove, and the waterproof sheet can be broken.

<Use of tube member>
In addition, it is desirable to provide a means for protecting the water for algae cultivation from external damage such as wind and rain, bird and insect dung, etc. in the groove. As a means for protecting the water, for example, a means for protecting the water by covering the upper portion of the groove with a cover member may be used. However, simply covering the groove with the cover member may cause damage or damage to the cover member due to wind and rain from the horizontal direction, and the weight may be increased or the position may be shifted. It is also necessary to prepare a means for preventing this. Therefore, simply covering the cover member from above may cause damage to the member, and there is also concern about the positional accuracy of the installation, so stable algae cultivation may not be expected.
Therefore, in the present invention, it is desirable to provide a tube member for transporting and cultivating water in which the algae are mixed with respect to the groove and to move the water in which the algae are mixed in the tube member. This is because the tube member is provided so that water in which the algae are mixed moves in the tube member, so that there is a risk that the algae cultivated in the groove may be mixed with wind, rain or fungi such as birds and insects. This is because it can be prevented and can be cultivated while maintaining a certain quality. In particular, in the case of algae cultivated in the present invention, the proportion of water for cultivation (water mixed with nutrient solution depending on the application) is important for cultivation, but the concentration of algae due to external wind and rain, etc. If there is a risk of variation, the quality may not be constant. However, by providing the tube member, there is no risk of rain mixing into the water for algae cultivation, and the concentration variation of the algae can be effectively suppressed, so it is necessary to provide a separate device for collecting the rain There is no. In addition, since the tube member can prevent the entry of birds, insects, etc., there is no need to perform a separate removal operation. That is, the cultivation quality of algae can be stabilized with a simple configuration.

  Further, by providing the tube member in the groove, the groove can prevent the tube member from being damaged or damaged by the influence of wind and rain, and the position of the tube member can be stabilized. As a result, it is possible to stabilize the cultivation environment because it is possible to reduce external influences such as wind and rain as much as possible by providing a tube member in the groove and moving the water mixed with algae inside the tube member. It can be made hygienic and desirable. In addition to the above, when the wall surface of the groove is reinforced by the reinforcing member, the position stability of the tube member can be further increased, and a more stable algal cultivation facility can be provided.

  The tube member may be formed to have a strength that can withstand the transportation and cultivation of water mixed with algae. For example, the tube member may be formed by selectively using materials such as resin, glass, metal, wood, and processed paper. I can do it. In particular, when the tube member is made of a transparent vinyl resin material or the like, it can be deformed into any shape without hindering the reception of sunlight. On the other hand, the tube member can be deformed and arranged in any shape, and installation, removal or recovery can be facilitated. As the arrangement method of the tube member, for example, several tube members formed in a straight line are arranged side by side in the horizontal direction, or the tube members are bent and arranged in an “S” shape in the horizontal direction, or in a spiral shape. It is also possible to bend the tube member. As described above, when the tube member is provided and formed so as to be deformable, the adjustment of the light receiving rate and the like is facilitated, so the type of algae that can be cultivated is not limited, and cultivation suitable for algae growth The environment can be easily formed.

≪About algae cultivation method≫
By using the algae cultivation facility formed as described above, it is possible to provide an algae cultivation method capable of cultivating a large quantity of stable algae. In particular, in the algae cultivation method according to the present invention, it is possible to effectively use a wide range of land by cultivating using existing paddy fields, as well as facilities related to paddy fields (equipped field, irrigation channel network, etc. ) Can be used effectively, the time and cost for growing algae can be greatly reduced.

In the algal cultivation method, a groove is formed when the paddy field is used, and the groove is preferably reinforced by a reinforcing member. When a rigid sheet-like member (for example, hard vinyl chloride) is used as the reinforcing member without using a hard member such as concrete, there is no restriction for legal reasons (agricultural land law, etc.). It can be easily introduced, and even when repairing / removing or collecting work, the work itself can be made easy. Therefore, by using the algae cultivation method, the existing paddy fields can be used effectively, so that opportunities for introducing capital, employment, and technology in rural areas are obtained, and a great contribution to regional revitalization can be expected. In particular, when cultivating fuel algae, because it leads to cooperation and coexistence with other industries (energy field, etc.), the cultivated algae can be used not only for food but also for research fields, etc. It will also be possible to lead to widespread use of.

  In the algae cultivation facility and the algae cultivation method according to the present invention, it is not necessary to newly establish facilities for water supply and drainage by using existing paddy fields, or to perform land maintenance from scratch. The construction period and cost can be greatly reduced. That is, in order to cultivate a large amount of algae, it is possible to provide an algae cultivation facility and algae cultivation method that can suppress the cost as much as possible even when cultivating a wide range of land.

  Moreover, in the algae cultivation facility and the algae cultivation method according to the present invention, it is possible to function as a water channel for algae cultivation by forming the groove in the plane surrounded by the straw in the paddy field. In other words, algae can be cultivated by using existing rice fields and the formed grooves function as water channels, so that a large amount of algae can be cultivated.

  In addition, when a tube member, a reinforcement member, etc. are provided with respect to the said groove | channel, it becomes possible to prepare the cultivation environment of algae more. That is, when a tube member is provided in the groove and the water in which the algae is mixed moves in the tube member, the risk of algae cultivated in the groove being exposed to wind and rain can be prevented, and a certain quality can be achieved. Cultivation in the held state is possible. Furthermore, by reinforcing the wall surface of the groove with a reinforcing member, it is possible to prevent the wall surface of the groove from collapsing due to wind and rain, etc. It is possible to maintain it across.

Therefore, because it is possible to prepare an algae cultivation environment with a simple configuration, the algae cultivation facility is configured so that the work can be simplified even when it is repaired and removed without complicating the installation process. And algae cultivation method can be provided.

It is a figure which shows the state of the paddy field utilized in the algae cultivation facility concerning this Embodiment, (A) The plane schematic diagram which shows an agricultural field maintenance state, (B) The principal part longitudinal cross-sectional schematic diagram which shows the area | region which forms a groove | channel. The perspective schematic diagram of the algal cultivation facility concerning this Embodiment. The disassembled perspective view which shows the structure of the water channel concerning this Embodiment. The principal part longitudinal cross-sectional schematic diagram which shows the structure of the waterway concerning this Embodiment. The principal part longitudinal cross-sectional schematic diagram which shows the structure of the water channel concerning other embodiment. It is a figure which shows the bottom face structural member in the reinforcement member concerning this Embodiment, (A) Front view, (B) BB sectional drawing. It is a figure which shows the bottom surface structural member concerning other embodiment, (A) Front view, (B) BB sectional drawing. It is a figure which shows the slope structural member in the reinforcement member concerning this Embodiment, (A) Front view, (B) BB sectional drawing. It is a figure which shows the slope structural member concerning other embodiment, (A) Front view, (B) BB sectional drawing. It is a figure which shows the various arrangement | positioning methods of the tube member with respect to a groove | channel, (A) The principal part longitudinal cross-section schematic which shows the state which bent and provided one tube member in "S" shape with respect to one groove | channel, ( B) Main part longitudinal cross-sectional schematic which shows the state provided so that a tube member might be completely embedded with respect to a groove | channel, (C) The state which formed the groove shallowly and the tube member was exposed so that more than half may be exposed in a height direction. The principal part longitudinal cross-section schematic which shows. It is a figure which shows the arrangement method of the tube member with respect to the groove | channel concerning other embodiment, (A) The top view which shows the tube member formed in the spiral shape, (B) The concave shape which inclined the wall surface of the spiral tube member BB sectional drawing which shows the state arrange | positioned in this groove | channel, (C) BB sectional drawing which shows the state which has arrange | positioned the spiral tube member in the convex groove | channel which inclined the wall surface. It is a figure which shows the arrangement method of the tube member with respect to the groove | channel concerning other embodiment, (A) The perspective view which shows the tube member formed in the raceway type, (B) The tube member formed in the raceway type in the groove | channel The AA sectional view showing the state where it was arranged, (B) The BB sectional view showing the state where the tube member formed in the raceway type was arranged in the groove.

  Hereinafter, an algal cultivation facility according to the present embodiment and an algal cultivation method using the facility will be specifically described with reference to the drawings.

  In FIG. 1, the state of the paddy field 10 utilized in the algae cultivation facility concerning this Embodiment is shown. As shown in FIG. 1 (A), the paddy field 10 is formed with a drainage channel 11, a water supply channel 12, and an entrance 13 for agricultural machinery such as a tractor. A plurality of sections formed with a short-distance distance of 30 m are provided. Since the paddy field 10 uses an existing fallow paddy field, the field maintenance has been completed to a certain extent, and there is no need to newly establish a facility for water supply and drainage. In addition, since the farm is being maintained, horizontality within each section is ensured, surface drainage is good even during rain, and the field structure and geology are relatively uniform, which will be described later. Formability is good also in forming the groove to be formed. As a result, by using the existing paddy field 10, it is not necessary to establish a new facility for water supply and drainage or to start land preparation from scratch, so the period and cost for constructing an algae cultivation facility can be greatly reduced. I can do things.

  In the algal cultivation facility according to the present embodiment, as shown in FIG. 1 (B), the groove forming region 15 is formed by using about 0.3 m of soil formed on the tiller in each section. That is, an algae cultivation facility using paddy fields can be completed by forming a groove using the groove forming region 15 in each section.

  Specifically, as shown in FIG. 2, the algae cultivation facility S is constructed in each section partitioned by the straw 14 in the plane surrounded by the straw in the paddy field 10. That is, in the algae cultivation facility S, a plurality of grooves 20 for transporting water mixed with algae to be cultivated are arranged in a horizontal direction, and the grooves 20 are functioned as a foundation for a water channel for algae cultivation. Algae can be cultivated. In addition, a nutrient solution tank 22 for supplying a nutrient solution and water for cultivating algae to the groove 20, a nutrient solution circulation device 24, and a drainage device 25 with a filtration mechanism are provided and arranged in the horizontal direction. The formed grooves 20 are connected to each other by a connecting pipe 26 for allowing the nutrient solution to flow, and the cultivated algae can be recovered by the recovery tank 23. The nutrient solution tank 22 contains components necessary for the growth of algae, such as nitrogen, phosphoric acid, potassium, and other nutrients in solution, and the nutrient solution circulation for feeding the nutrient solution and water The device 24 supplies water for algae cultivation to the groove 20. In addition, the said nutrient solution tank 22 can be comprised so that attachment or detachment is possible, and it can also bring and use the tank which prepared the solution in another place. Further, in the case where the nutrient solution tank 22 is installed at a place higher than the groove 20, the nutrient solution circulation device 24 is not necessarily required, and the nutrient solution and water in the nutrient solution tank 22 may be poured out depending on the water level. it can. The algae concentration and cultivation period can be arbitrarily set according to the type of algae, but in this embodiment, in order to produce microalgae to produce oil for bio raw materials and fuel, the concentration of algae is set. It adjusted so that it might be set to about 0.20-0.40 (g / L Dry), and the cultivation period was performed in about 7 days-10 days. Then, the cultivated water for algae cultivation is drained by a drainage device 25 having a filtration mechanism, and the algae serving as a target collection is collected by a collection tank 23. The collection tank 23 can be arbitrarily configured. For example, the collection tank 23 can be collected by filtration using a filter, a filtration device, or the like, or can be collected by means such as centrifugation. In addition, a water temperature adjusting device or the like may be provided separately according to the purpose.

  In the algae cultivation facility S, the existing paddy field 10 is used and the formed groove 20 is made to function as a water channel, so that carbon dioxide can be easily taken in and nutrients can be distributed uniformly. Furthermore, the collection work can be facilitated, and algae can be cultivated using the paddy field 10 formed extensively, so that a large amount of algae can be cultivated. In addition, by forming the groove 20 using the paddy field 10, it is possible to reduce the head difference of water for algae cultivation arranged in the horizontal direction and to suppress the load for supplying water as much as possible. In addition to reducing the burden on facilities used for water supply and drainage, it is also possible to reduce the influence of wind and rain from the horizontal direction as much as possible.

  Here, the structure of the waterway concerning this Embodiment is demonstrated, referring FIG.3 and FIG.4. According to the present embodiment, a groove 20 for transporting water mixed with algae to be cultivated is formed in the plane surrounded by the straw in the paddy field 10, and the groove 20 is a base on the water channel. It is functioning as. The groove 20 is provided with a water channel sheet 34 for improving the flow of water, and a tube member 21 is provided thereon, so that the water 40 mixed with algae 41 moves in the tube member 21. ing. The channel sheet 34 may not be used when the tube member 21 is provided as in the present embodiment and the water moves within the tube member 21. In the present embodiment, the tube member 21 is used for further stabilizing the position.

  The tube member 21 is provided for transporting and cultivating the water 40 mixed with the algae 41, and is formed using a transparent vinyl resin material so as to facilitate the collection operation. In the present embodiment, the tube member 21 is provided, and the water 40 mixed with the algae 41 is configured to move in the tube member 21, so that the algae 41 cultivated in the groove 20 is rainy or rainy or birds / insects etc. This can prevent the possibility of contamination of buns, etc., and enables cultivation with a certain quality maintained. That is, by providing the tube member 21, there is no risk of rain or the like being mixed into the water 40 for algae cultivation, and the variation in the concentration of the algae 41 can be effectively suppressed, so that the cultivation quality of algae can be stabilized. It is configured.

  As shown in FIG. 5, the tube member 21 may not be provided, and the water 40 mixed with the algae 41 may be directly conveyed by the water channel sheet 34. By not providing the tube member 21, the cost for the member can be reduced, and the trouble of installing or removing the member can be saved.

  Further, according to the present embodiment, the bottom surface constituting member 31 for shaping the wall surface of the groove 20 on the bottom surface of the medium partitioned from the soil, and the slope constituting member 33 for shaping the side surface of the medium partitioned from the soil. And a reinforcing member 30 including the cover member 33 covering the slope member 33. The reinforcing member 30 is made of hard polyvinyl chloride resin, and by reinforcing the wall surface of the groove 20 with the reinforcing member 30, it is possible to prevent the wall surface of the groove 20 from collapsing due to wind and rain, etc. Or it is set as the structure which can prevent penetration | invasion of the root of a plant and can maintain the formed groove shape over a long period of time.

Here, the reinforcing member 30 will be specifically described with reference to FIGS. First, a mesh-like bottom surface constituting member 31 having a height is laid on the bottom surface of the groove 20 excavated in a concave shape. As shown in FIG. 6, the bottom surface constituting member 31 can have a mesh-like structure composed of ribs having a height of about 2 to 10 cm. Such ribs can be formed using natural resin such as wood, plastic, or metal. In addition, as shown in FIG. 7, the bottom surface component 31 is formed by bending a band-shaped member formed in a band shape using a resin or metal, and connecting adjacent band-shaped members at a curved portion. You can also do things. Even when formed in this way, the height is preferably about 2 to 10 cm. By installing such a bottom surface component 31 on the bottom surface of the groove 20, the bottom surface component member 31 is inserted so as to be buried in a portion that is higher than necessary, while in a portion that is recessed more than necessary, This bottom surface component 31 exists in a bridge shape. Since the bottom surface component 31 is filled with earth and sand, a flat surface can be formed on the basis of the bottom surface component 31.

  Further, as shown in FIG. 8, a slope-constituting member 32 formed by projecting a rib-like wall portion 32b on one surface of the flat portion 32a is formed on the slope (side surface) of the groove 20 dug into a concave shape. Buried. The slope-constituting member 32 can be formed using a resin or metal, and the height of the rib can be approximately 2 to 10 cm. In the embodiment shown in FIG. 8, the rib-like wall portion 32b is extended in the length direction and the width direction of the plane portion 32a, and the two intersect each other to form a rectangular cell 80 in plan view. In addition, as shown in FIG. 9, the rib-like wall portion 32b is inclined in the plane of the plane portion 32a so that the cells 80 formed to intersect each other have a rhombus in plan view. It can also be formed as follows. Furthermore, the wall portion 32b can be formed to project in an annular shape, thereby forming a cell 80 having a circular shape in plan view. The cell 80 constituted by the wall portion 32b formed as described above is filled with earth and sand, and in the state filled with earth and sand, the flat surface portion 32a (on the closed side of the cell 80) of the slope component member 32 is filled. Face) inside the groove 20 and set it on the slope in the groove. By installing in this way, the earth and sand in the cell 11 is integrated with the earth and sand constituting the slope of the groove 20, so that the wall 32b bites in a spike shape with respect to the slope, and the slope is surely secured. Can be held. Further, in the present embodiment, a cover member 33 for preventing the slope component member 32 from being deteriorated is provided. Therefore, even when used for many years, the possibility that the slope will collapse due to wind and rain can be reduced as much as possible, and cultivation can be performed with confidence. In addition, since no hard materials such as concrete are used, there is no restriction due to legal reasons (agricultural land law, etc.), and it can be easily introduced. However, the work itself can be made easy. That is, since the installation / removal work can be facilitated even when returning to the paddy field, the removal and recovery work can be quickly performed even when the paddy field is used for another cultivation.

  FIG. 10 shows various arrangement methods of the tube member 21 with respect to the groove 20. For example, as shown in FIG. 10 (A), one tube member 21 can be bent in an “S” shape with respect to one groove 20. In this way, it is possible to save the labor of forming a number of grooves 20 for one section, and the labor of installing the reinforcing member 30 including the bottom surface component 31 and the slope surface component 32 that accompanies the formation of the groove 20. This leads to a reduction in the number of components and the saving of components, and the time and cost required for installation can be reduced.

  Further, as shown in FIG. 10B, the tube member 21 may be provided so as to be completely buried in the groove 20. By providing the tube member 21 so as to be completely buried in the groove 20, it is possible to effectively prevent the displacement of the tube member 21, so that water mixed with algae in the tube member 21 can oscillate. The possibility of the variation in the concentration of the algae 41 can be effectively reduced.

  Further, as shown in FIG. 10C, the groove 20 may be formed shallowly and the tube member 21 may be provided so as to be exposed more than half in the height direction. By providing the tube member 21 so as to be exposed more than half in the height direction, the light receiving rate of sunlight can be increased, and the growth of the algae 41 can be promoted effectively.

  11 and 12 show a method of arranging the tube member 21 with respect to the groove 20 according to still another embodiment. For example, FIG. 11 shows a state in which the tube member 21 formed in a spiral shape is disposed in a concave or convex groove 20 having an inclined wall surface. The reason why the groove 20 is formed by inclining the wall surface is to adjust the concentration of oxygen (and carbon dioxide) contained in the water in the tube member 21. The algae 41 generates oxygen by photosynthesis, but if the oxygen is contained in a large amount in water, the growth of the algae 41 may be inhibited. In order to prevent this, the tube member 21 may be inclined by inclining the wall surface of the groove 20 as described above, or the oxygen concentration may be adjusted by providing a separate oxygen degassing system. Absent.

  FIG. 12 shows a state in which a tube member 21 formed in a raceway shape is disposed in the groove 20. By forming the tube member 21 in a raceway shape, it is possible to cultivate while circulating water so that the algae 41 and nutrient solution do not settle, so it is possible to promote the growth of the algae 41 effectively. .

  By using the algae cultivation facility S formed as described above, it is possible to provide an algae cultivation method capable of cultivating a large quantity of algae 41 with stable quality. In particular, in the algae cultivation method according to the present embodiment, it is possible to effectively use a wide range of land by cultivating using the existing paddy field 10, and also the facilities (provided field, irrigation) related to the paddy field 10. Since the waterway network, etc. can be used effectively, the period and cost for growing the algae 41 can be greatly reduced.

By using the algal cultivation method, the existing paddy field 10 can be used effectively, and a large amount of algae 41 with stable quality can be cultivated. For example, when fuel algae is cultivated as algae 41, the cultivated fuel algae can be used as energy instead of gas or oil, or the fuel algae can be used as animal feed, such as cattle and pigs. It can also be used for industry. In other words, by cultivating a large amount of algae using the algae cultivation method, it can lead to cooperation and coexistence with other industries (energy field, etc.), so the cultivated algae are not only used for food, but also for research. It can also be used in fields, etc., and can lead to widespread use of algae. As a result, there are opportunities to introduce capital, employment, and technology to the rural areas where paddy fields are owned, which can be expected to contribute greatly to regional revitalization and can be expected to lead to the construction of a new rural system.

S algae cultivation facility
10 Paddy field
11 Drainage channel
12 Water supply channel
13 Boarding entrance
14 畦
15 Groove formation area
16 Tillage
20 groove
21 Tube member
22 Nutrient tank
23 Collection tank
24 Nutrient solution circulation device
25 Drainage device
26 Connecting pipe
30 Reinforcing member
31 Bottom component
32 Slope components
32a Plane section
32b wall
33 Cover member
34 Canal seat
40 water
41 Algae
80 cells

Claims (4)

An algae cultivation facility using paddy fields,
An algae cultivation facility characterized in that a groove for conveying water mixed with algae to be cultivated is formed in a plane surrounded by straw in a paddy field.
The groove is provided with a tube member for transporting and cultivating water mixed with algae,
The algae cultivation facility according to claim 1, wherein water mixed with algae moves in the tube member.
The wall surface of the groove is reinforced by a reinforcing member composed of a bottom structural member that shapes the bottom surface of the medium partitioned from the soil and a slope structural member that shapes the side surface of the medium partitioned from the soil. The algae cultivation facility according to claim 1 or 2, characterized in.
  The algae cultivation method using the algae cultivation facility of any one of Claims 1-3.