JP2016178917A - Purification method of closed circulation type land farm - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a breeding/cultivating method of a cultivation marine animal which improves growth or reduces prevalence and mortality of a cultivation marine animal such as a shrimp without destructing an ambient environment and achieves an excellent body quality of a quality shrimp, etc, in a closed circulation type land farm.SOLUTION: A nanofiber sheet 15 having an antibacterial function is spread on a ground surface 19 of a cultivation pond 18 in a closed circulation type land farm, a super water repellent nanofiber sheet 17 is spread on the nanofiber sheet, and slag 20 is further stacked on the super water repellent nanofiber sheet, and thereby the cultivation pond 18 is formed. Cultivation water is poured into the cultivation pond and a cultivation marine animal such as a shrimp is cultivated therein.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for purifying a closed circulation land farm that cultivates cultured seafood such as shrimps.

  Conventionally, in closed-circulation land farms such as shrimps, sludge bottom mud containing a large amount of organic matter accumulates on the sea floor due to the excessive supply of carcass, residual food, and feed of cultured seafood such as shrimps. This has caused problems such as poor growth of shrimp and other cultured seafood, increased morbidity and mortality, and decreased production. As countermeasures, methods such as pumping sludge from the seabed, spraying sand on the top of the seabed sludge, and blowing a method of blowing air into anoxic water areas are being implemented. There were many problems such as energy consumption. In addition, concrete blocks with cement, coal ash, and aggregate solidified are laid down on the sea floor, but there are concerns that it is difficult to replace concrete blocks and the same farm cannot be used with the life of the concrete blocks. there were.

  In this way, in the conventional closed-circulation land farms such as shrimp, there is still no satisfactory growth method, and a large amount of organic matter deposited on the seabed is anaerobic decomposition process in the summer high water temperature period. Because of this, harmful hydrogen sulfide is generated, so the ocean floor is polluted with a large amount of organic sludge that cannot be inhabited by organisms, which adversely affects the growth of shrimp in farms.

  In particular, in a closed circulation type land farm, feeding shrimp or the like causes an increase in dissolved substances in seawater, loads organic matter on the seabed, and adversely affects water quality and low quality.

  Therefore, a purification method for improving the water quality and bottom quality of the closed water area is eagerly desired.

  Therefore, the present invention is intended to solve these problems, and the first object of the present invention is to promote growth of precultured seafood such as shrimps or to reduce the prevalence and mortality. .

  The second object of the present invention is to improve the quality of cultured seafood such as shrimps.

  The third object of the present invention is the breeding and aquaculture of shrimp and other cultured seafood that do not destroy the environment surrounding the closed circulation type land farm and can reduce the operating cost of the related equipment. Is made possible.

  The first solution of the present invention is to spread a nanofiber sheet having an antibacterial function on the ground surface of a closed circulation type land farm, spread a super water-repellent nanofiber sheet thereon, and further The slag is piled up, and the aquaculture water is poured into the aquaculture site to allow breeding or aquaculture of cultured seafood such as shrimps.

  The second solution is that a nanofiber sheet having an antibacterial function is formed from a molten polymer of polypropylene or polyethylene mixed with scallop powder as an antibacterial agent.

  A third solution is that the super water-repellent nanofiber sheet is formed from a molten polymer of a thermoplastic polymer PET bottle such as polypropylene, polyethylene, or polyester.

  The fourth solution consists of a nanofiber sheet having an antibacterial function and a super-water-repellent nanofiber sheet, a jet nozzle that discharges molten polymer, and an air nozzle that blows high-speed and high-temperature air. It was produced from a nanofiber generating means in which a molten polymer discharged with air was drawn into nanofibers.

  The fourth solution is to use iron slag generated from a blast furnace or converter.

  Here, the nanofiber sheet having an antibacterial function is composed of an ejection nozzle that ejects a molten polymer and an air nozzle that generates high-speed and high-temperature air that is used to stretch the molten polymer that is ejected from the ejection nozzle. Using the nanofiber generating means that expands the volume by heating to high temperature and creates high-speed high-temperature air, and stretches the molten polymer on this high-speed high-temperature air flow to generate nanofibers, A nanofiber having a fiber diameter of 10 nm to 1 μm is generated from a molten polymer mixed with an antibacterial agent, and is formed by laminating thin layers.

  Antibacterial agents are used either alone or in combination with natural antibacterial agents such as scallop powder or inorganic metals such as silver zeolite

  And the nanofiber sheet having an antibacterial function spread on the ground surface of the culture pond is impregnated with an antibacterial agent and has a very large specific surface area, thereby generating a strong antibacterial effect. This makes it possible to prevent food and carcass rot bacteria remaining in the rotted sand layer on the ground surface of the culture pond from entering. Therefore, the nanofiber sheet having an antibacterial function can be used to cut off the rotted sand layer and to purify the closed circulation land farm.

Furthermore, the characteristics of the nanofibers produced by the nanofiber generating means used in the present invention are larger than those of the electrospinning method. When it is prepared by an electrospinning method, a nanofiber film is planarly formed when the fiber diameter is close to 100 nm. Compared to this, the nanofibers used in the present invention are bulky and layered to form a shape. Therefore, it has the following advantages.
1. Because it is bulky and layered, it has a long antibacterial life.
2. Antibacterial efficiency is high because it is bulky and layered.
3. Because it is bulky and layered, it has a large amount of antibacterial adsorption.
This is because the nanofiber generating means used in the present invention that does not use a high voltage does not capture bacteria in the gap between the nanofiber sheets due to factors such as increased intermolecular force when the fiber diameter is 400 nm or less. Comes with a feature that is adsorbed. This makes it possible to produce a nanofiber sheet having an antibacterial function that is highly efficient, has a long lifetime, and has a large amount of bacteria adsorbed.
Up to now, even when trying to use nanofibers, if the fiber diameter is 400 nm or less, it was not effective. However, by using the nanofiber generating means used in the present invention, nanofibers with a thinner fiber diameter can be obtained. Even if a bulky nanofiber sheet can be formed, finer bacteria can be adsorbed.

  Examples of the material of the nanofiber sheet having an antibacterial function include polyester, polyamide, polyolefin, polyurethane (PU), and the like. Examples of the polyester include polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polybutylene terephthalate (PBT), and polylactic acid (PLA). Examples of the polyamide include nylon 6 (N6), nylon 66 (N66), nylon 11 (N11), and the like. Examples of the polyolefin include polyethylene (PE), polypropylene (PP), and polystyrene (PS).

  The super water-repellent nanofiber sheet is formed by laminating a thin layer from a nanofiber of 10 nm to 1 μm from a molten polymer using the nanofiber generating means used in the nanofiber sheet having an antibacterial function. The thickness of the super-water-repellent nanofiber sheet is from a thin super-water-repellent nanofiber sheet to a thick mat-shaped super-water-repellent nanofiber sheet.

  Depending on the breeding or aquaculture conditions, an appropriate thickness of super-water-repellent nanofiber sheet or thin super-water-repellent nanofiber sheet and thick super-water-repellent nanofiber is placed on the nanofiber sheet with antibacterial function spread on the ground surface of the culture pond. Fiber sheets are combined and spread.

  The super-water-repellent nanofiber sheet spread on the nanofiber sheet with antibacterial function has the function of high air permeability with a large specific surface area, uniform and small air holes, and a dense high density capture function Therefore, it is possible to send air to the boundary with the slag laminated on the super water-repellent nanofiber sheet and solve the poor oxygen water area at the bottom, and adsorb a large amount of pollutants in the bottom and water Therefore, it is possible to appropriately maintain the growth environment of cultured seafood such as shrimps.

  As the material of the super water-repellent nanofiber sheet, a thermoplastic polymer PET bottle such as polypropylene, polyethylene or polyester is used as it is. In particular, plastic bottles in Iraq, Afghanistan, Saudi Arabia, and other countries use PET bottles for the supply of drinking water, which is a major problem in the treatment of industrial waste. By using it, it leads to reduction of industrial waste and can greatly contribute to environmental conservation.

  The slag laminated on the super water-repellent nanofiber sheet is preferably a steel slag having a large production amount. This steel slag is generated in Japan alone at 30 million tons / year in blast furnaces and 10 million / year in converters. Slag is treated as industrial waste, and processing costs are high. For this reason, effective use of slag has been sought for a long time. Therefore, the present inventor has paid attention to this slag and obtained various trials and errors and succeeded in using it in the present invention.

  And by using this slag, when used for aquaculture of organisms that have the habit of getting into the bottom of the water like shrimp, the shrimp's soft shell will not be damaged when it comes into contact, and will adversely affect shrimp aquaculture There is nothing. Furthermore, when shrimp crawls into the bottom of the slag, the shrimp shell is dyed blacker and the effect of increasing the commercial value of shrimp is exhibited.

  Furthermore, since the slag contains a calcium compound, the environment of the water area is purified by the action of the calcium compound, which is useful for the growth of shrimp.

(1) It is possible to efficiently carry out treatments such as environmental purification and detoxification of polluted materials including harmful materials at farms for cultured seafood such as shrimps.
(2) Since slag can create a state closer to the living environment such as shrimp, it is well cultivated.
(3) It can maintain the shrimp growth environment appropriately by purifying carcasses, excrement, etc. accumulated in the water or bottom of aquaculture farms such as shrimps.
(4) It is possible to promote the reduction of the prevalence and mortality of farmed fishery products such as shrimps.

Schematic which shows the nanofiber generation | occurrence | production means which produces | generates the nanofiber sheet which has an antibacterial function, and a super-water-repellent nanofiber sheet. The block diagram of the culture land of this invention which cultures cultured seafood, such as shrimp.

  A nanofiber generating means for generating a nanofiber sheet having antibacterial functions such as shrimp and a super water-repellent nanofiber sheet constituting the present invention will be described with reference to FIG.

Reference numeral 1 denotes a nanofiber generating means, and the nanofiber generating means 1 is used for extending a molten polymer discharged from the injected nozzle 2 and an injection nozzle 2 for discharging a polypropylene or polyethylene molten polymer mixed with scallop powder as an antibacterial agent. And an air nozzle 3 for generating high-speed and high-temperature air. Reference numeral 4 denotes a guide box for preventing the nanofibers 5 generated by the nanofiber generating means 1 from diffusing. Reference numeral 6 denotes a suction box for sucking the nanofiber 5 mixed with the antibacterial agent produced by the nanofiber generating means 1. A fan 7 is attached in the suction box 6. Reference numeral 8 denotes a base material supply roll in which a base material sheet 9 made of a nonwoven fabric or the like is wound and supported rotatably. Reference numeral 10 denotes a feeding roll for the base sheet 9. Cutouts 11 and 12 are formed on opposite sides of the guide box 4 on the suction box 6 side, and the base sheet 9 is formed so as to pass through the cutouts 11 and 12. Further, an opening 13 is formed in the guide box 4, and the nanofiber 5 mixed with the antibacterial agent that has been riding on the flow of high-speed and high-temperature air by driving the fan 7 in the suction box 6 is formed through the opening 13. The base sheet 9 is continuously laminated. The laminated base sheet 9 is wound up by a nanofiber winding roll 16 as a nanofiber sheet 15 integrated with the nanofiber 5 mixed with an antibacterial agent by a thermocompression roller 14 and having an antibacterial function.
Further, when a molten polymer of a thermoplastic polymer PET bottle such as polypropylene, polyethylene, or polyester is used, a super water-repellent nanofiber sheet 17 is generated.

  Next, a closed circulation type land farm such as shrimp of the present invention will be described with reference to FIG.

  Reference numeral 18 denotes an aquaculture pond. A ground surface 19 at the bottom of the aquaculture pond 18 is covered with a nanofiber sheet 15 having an antibacterial function. Further, a super water-repellent nanofiber sheet 17 is spread on the nanofiber sheet 15 having an antibacterial function. The super water-repellent nanofiber sheet 17 is composed of a thick super-water-repellent nanofiber sheet 17A and a thin super-water-repellent nanofiber sheet 17B. Further, a slag layer 20 is laid on the thin water-repellent nanofiber sheet 17B, and the aquaculture water is stored on the slag layer 20. The aquaculture water has soaked up to the slag layer 20.

  Shrimp fry or adult fish are released into the aquaculture pond 18 having such a structure for aquaculture.

  Shrimp live in the bottom of the aquaculture water, that is, on the surface of the slag layer 20 or in the water, or in some cases, dig into the slag layer 20. Then, the shrimp penetrates into the slag layer 20 so that the black fine powder of the slag adheres to the shell of the shrimp and dyes the shrimp in a black color, thereby increasing the commercial value of the shrimp.

    On the other hand, during shrimp farming, shrimp excrement, feed residue, etc. accumulate in water or in the slag layer 20. Here, since the slag contains a calcium compound, the contaminants generated in the culture pond 16 by the action of the calcium compound are decomposed into a gas such as carbon dioxide, or decomposed or exchanged into other harmless substances. Or

  Next, since the super-water-repellent nanofiber sheet 17 is spread under the slag layer 20, the super-water-repellent nanofiber sheet 17 having a high air permeability function including a large specific surface area, a uniform, and small air holes is used. It becomes possible to send air to the boundary with the slag and solve the poor oxygen water area at the bottom. Furthermore, because it adsorbs a large amount of pollutants in the bottom of the water and water, it is possible to appropriately maintain the growth environment of cultured seafood such as shrimps.

  Furthermore, since the nanofiber sheet 15 having a very large specific surface area and having a strong antibacterial function of scallop powder is disposed under the super water-repellent nanofiber sheet 17, it remains on the ground surface 17 at the bottom of the culture pond 18. It is possible to prevent the invading food and carcass spoilage. Therefore, the nanofiber sheet having the antibacterial function can be used to cut off the septic layer and to purify the closed circulation type land farm.

  Note that the present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the components without departing from the scope of the invention in the implementation stage, and a plurality of components disclosed in the embodiments. Various modifications can be made by an appropriate combination of the above.

  The purification method of the present invention in a closed circulation type land farm uses the characteristics of nanofiber sheets made of nanofibers with a small fiber diameter and industrial waste by using slag, which is a big problem particularly in the treatment of industrial waste. The present invention is extremely useful in the industry because it contributes to the reduction of goods and can greatly contribute to environmental conservation.

DESCRIPTION OF SYMBOLS 1 ... Nanofiber generation means 2 ... Jet nozzle 3 ... Air nozzle 4 ... Guide box 5 ... Nanofiber 6 ... Suction box 7 ... Fan 8 ... Substrate supply Roll 9 ... Base sheet 10 ... Feeding roll 11,12 ... Notch 13 ... Opening part 14 ... Thermo-compression roller 15 ... Nanofiber sheet 16 having antibacterial function 16 ... Nanofiber winding roll 17 ... Super water-repellent nanofiber sheet 17A ... Thick layer super water-repellent nanofiber sheet 17B ... Thin layer super water-repellent nanofiber sheet 18 ... Culture pond 19・ Ground surface 20 ... Slag layer

Claims (5)

  Spread the nanofiber sheet with antibacterial function on the ground surface, spread the super water-repellent nanofiber sheet on it, and inject the aquaculture water into the aquaculture pond formed by stacking slag on it, and culture of shrimp etc. A method for purifying a closed circulation type onshore farm characterized by culturing seafood.   The nanofiber sheet with antibacterial function consists of a jet nozzle that discharges molten polymer such as polyester, polypropylene, or polyethylene mixed with scallop powder as an antibacterial agent, and an air nozzle that blows high-speed high-temperature air, and blows out from the air nozzle The method for purifying a closed circulation type land farm according to claim 1, characterized in that the polymer is generated by a nanofiber generating means that draws a melted polymer discharged with high-speed and high-temperature air into nanofibers.   The super water-repellent nanofiber sheet is composed of a jet nozzle that discharges molten polymer from thermoplastic polymer PET bottles such as polypropylene, polyethylene, and polyester, and an air nozzle that blows high-speed and high-temperature air. 2. The method for purifying a closed circulation type land farm according to claim 1, wherein the melted polymer discharged with air is produced by a nanofiber generating means which is drawn into nanofibers.   The super-water-repellent nanofiber sheet is composed of a thin sheet and a thick sheet. The method for purifying a closed circulation type land farm according to claim 3.   The method for purifying a closed circulation type land farm according to claim 1, wherein the slag is iron slag generated from a blast furnace or a converter.

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