Seaweed farming system by using plasma

Abstract

The seaweed farming system of the present invention comprises a tank for receiving a fluid and seaweed floating inside the fluid, a filter unit received inside the tank for passing the fluid and filtering the seaweed, and a circulation unit configured to allow the fluid that has passed through the filter unit to circulate. The circulation unit may include a sterilization tank into which the fluid is introduced, a venturi tube connected to the sterilization tank and supplying ozone to the fluid, a plasma reactor connected to the venturi tube, and a circulation pump formed to allow the fluid to be reintroduced into the tank. The seaweed farming system of the present invention is designed to use seawater (fluid) sterilized using plasma for seaweed farming, and is designed to reuse seawater in a tank (farming tank) containing nutrients by circulating it, making it economical.

Description

Technology Field

[0001] The present invention relates to a seaweed farming system using plasma, and more specifically, to a seaweed farming system designed to use seawater sterilized by plasma for seaweed farming, which can improve the quality and productivity of the seaweed. Background Technology

[0002] Gim is a purple-haired seaweed that inhabits the sea and grows naturally attached to substrates such as stones or shellfish. Therefore, natural reproduction alone cannot meet the demand for gim, so it is harvested through artificial cultivation.

[0003] Gim (seaweed) farming is primarily carried out in seas of suitable depth not far from inland bays. Depending on factors such as the degree of exposure of the seaweed and the installation method of the nets, farming methods are classified into exposed floating, non-exposed floating, and stake types. In the exposed floating method, buoys are attached to the nets to expose them to the atmosphere for a certain period each day. This helps remove unwanted algae and prevent disease, and reduces the frequency of acid treatment; however, it has the disadvantage of requiring daily time and labor to turn over the nets. The non-exposed floating method involves cultivating nets floating on the water surface. Since there is no stress from exposure, growth is rapid and yields are high. However, because there is absolutely no artificial or natural exposure, disease infection and the proliferation of unwanted algae become easier, requiring frequent acid treatment. The stake method is carried out in mudflats with tidal differences; stakes are driven into the mudflats, and nets are suspended between them. This method utilizes the principle that seaweed is exposed to the air during low tide; while it reduces the cost and time of acid treatment, it has the disadvantage of lower production yield.

[0004] Seaweed farming is preceded by a seeding process in which spores are attached to the seaweed nets. Seeding is carried out on land or at sea, and the seeded nets are stored in freezing nets until cultivation begins. Additionally, acid treatment is required during the farming process to remove unwanted algae and prevent diseases. This treatment utilizes an organic acid with a 9.5% inorganic acid content; it is performed by filling specially designed boats with the acid and passing the seaweed nets through tanks containing the acid. Acid treatment is conducted immediately at sea and is performed approximately once every 10 days. The seaweed farming period typically lasts for about six months, from November to April. The harvesting of fresh seaweed is carried out immediately at sea using specially designed harvesting vessels. Harvesting takes place approximately every 25 to 30 days, and this frequency can be adjusted according to the growth rate. The end date of cultivation is determined by changes in the marine environment; the farming period may be shortened due to factors such as water temperature, or the process may be terminated prematurely due to natural disasters. Once cultivation ends, the installed seaweed nets, support lines, anchors, etc., are removed from the sea.

[0005] Seaweed farming conducted at sea is closely linked to the marine environment, leading to various complex problems. Since seaweed farms are exposed to unwanted algae and numerous infections in the ocean, timely acid treatment must be carried out. If departures are delayed due to poor sea weather, unwanted algae can cover the nets, hindering growth, or the thallus may detach from the nets due to disease infection. Furthermore, if disease infection is not suppressed and currents become active due to wind, the disease can spread throughout the entire farm, significantly impacting production yield. Organic acid treatment agents used for acid treatment are significantly less costly, time-consuming, and efficient compared to inorganic acids. Consequently, the illegal use of inorganic acids is frequent, and recently, the use of various illegal agents such as bleach, pesticides, and sulfuric acid has been confirmed. Additionally, during winter sea weather—specifically when waves are high—strong currents cause damage to facilities such as seaweed nets, leading to potential loss.

[0006] On the other hand, there is a limitation in that cultivation is only possible during the winter, as the optimal growth temperature for laver is 10 to 15°C. After April, when water temperatures rise, the color of the laver changes or growth slows, and production volume drops sharply due to diseases such as fungal spores. Furthermore, the seedlings supplied during cultivation are frequently not of a single variety; typically, two to three varieties are mixed appropriately to prepare for the possibility of cultivation failure due to various external factors after cultivating a single variety. Under these realities of laver cultivation, there is a possibility of economic loss due to royalty payments when using foreign varieties in accordance with UPOV (Union for the Protection of New Varieties of Plants).

[0007] Although seaweed farming utilizes specially designed fishing vessels, it requires a large workforce as most operations take place at sea; furthermore, there is a risk of human casualties from accidents involving nets or ropes during manual labor. In particular, the farming process involves numerous steps, from seeding to installing seaweed nets in the farm, which consumes significant manpower and time, resulting in a disadvantage of low labor productivity. Additionally, accidents frequently occur during the acid treatment process, and the economic losses are substantial due to the costs of the acid, labor, time, and equipment involved.

[0008] To overcome the disadvantages of such marine aquaculture and to address the decline in seaweed yields caused by changes in the marine environment, new land-based aquaculture is required. Additionally, an indoor aquaculture system is needed that can increase yields and develop new varieties by appropriately controlling the seaweed growth environment. Previously, a factory-type aquaculture facility was proposed for use in fish farming (Registered Patent 10-1604699). This facility, which arranges aquaculture tanks within a structure consisting of insulated side walls and an insulated roof and supplies feed to each tank or lifts farmed fish using a large crane, is suitable for fish farming but has technical limitations when utilized as an indoor aquaculture facility to control the growth conditions of seaweed.

[0009] In addition, a land-based seaweed farm using a net-shaped seaweed net has been proposed (Published Patent 10-2018-0007358), but since the process of repeatedly immersing the seaweed net in a reservoir is required similar to conventional exposed-type offshore farming, continuous power is required to drive the device, and in order to increase the seaweed harvest yield, the size of the seaweed net and the size of the reservoir must inevitably be increased, which has the disadvantage of requiring enormous facility costs to implement a large-scale farm.

[0010] An indoor seaweed cultivation system, disclosed in another form of registered patent No. 10-2084308, has been proposed. This technology is equipped with a large tank, a light irradiation unit, and a stirring device to enable indoor cultivation; however, there were problems with the large scale of the overall cultivation facility and the difficulty of controlling the cultivation environment in individual tanks.

[0011] Therefore, there is a need to develop a new economical seaweed farming system that prevents the decline in productivity of seaweed caused by various diseases (red seaweed, sphagnum moss, yellow spot disease, etc.) and allows for easy control of the growth conditions of seaweed. The problem to be solved

[0012] Accordingly, the technical problem of the present invention is conceived from this point, and the objective of the present invention is to provide an economical seaweed farming system designed to use seawater sterilized using plasma for seaweed farming, and to circulate and reuse the seawater in a tank (farming tank) containing nutrients. means of solving the problem

[0013] According to one embodiment for realizing the purpose of the present invention described above, a seaweed farming system is provided, comprising: a tank for receiving a fluid and seaweed floating inside the fluid; a filter unit received inside the tank for passing the fluid and filtering the seaweed; and a circulation unit configured to allow the fluid that has passed through the filter unit to circulate, wherein the circulation unit comprises: a sterilization tank into which the fluid is introduced; a venturi tube connected to the sterilization tank and supplying ozone to the fluid; a plasma reactor connected to the venturi tube; and a circulation pump formed to allow the fluid to be reintroduced into the tank.

[0014] The above plasma reactor may include a cylindrical quartz tube with one end open; an iron wire inserted into the quartz tube through the opening; and a copper thin film covering at least a portion of the outer wall of the quartz tube.

[0015] The above-mentioned venturi tube may be connected to the plasma reactor through: a cylindrical ozone supply hose having a hollow formed at the other end opposite to the one end of the plasma reactor; and an ozone supply unit connected to the ozone supply hose and connected to the inside of the venturi tube.

[0016] The ozone supply unit may be a T-shaped branch pipe, composed of a vertical pipe extending in the same direction as the length of the venturi pipe and a horizontal pipe extending in a direction perpendicular to said direction, wherein the horizontal pipe is connected to the ozone supply hose and the vertical pipe is connected to the venturi pipe.

[0017] The above-mentioned venturi tube may include a fluid inlet through which the fluid flows in and a fluid outlet through which the fluid flows out.

[0018] The above-mentioned venturi tube may include: a concave portion located near the center of the venturi tube, in which the inner diameter decreases as it moves from the fluid inlet toward the center; and a convex portion having a convex shape in which the inner diameter gradually increases and then gradually decreases as it moves from near the center of the venturi tube toward the fluid outlet.

[0019] The inner diameter of one end of the above vertical tube on the fluid inlet side may be larger than the inner diameter of the above Venturi tube.

[0020] The inner diameter of one end of the above vertical tube on the fluid outlet side may be smaller than the inner diameter of the above Venturi tube. Effects of the invention

[0021] According to embodiments of the present invention, the seaweed farming system of the present invention is designed to use seawater sterilized using plasma for seaweed farming, and is designed to recirculate and reuse seawater in a tank (farming tank) containing nutrients, thereby being economical.

[0022] However, the effects of the present invention are not limited to the above effects and may be extended in various ways without departing from the spirit and scope of the present invention. Brief explanation of the drawing

[0023] FIG. 1 is a schematic diagram of a seaweed farming system according to one embodiment of the present invention. FIG. 2 is a schematic diagram of a seaweed farming system according to one embodiment of the present invention. Figure 3 shows the Venturi tube and plasma reactor of the present invention in more detail. Figure 4 (a) is a photograph of a sterilization tank of a seaweed farming system according to one embodiment of the present invention, and (b) is a photograph of a plasma reactor. Figures 5 to 7 are the results of photographing a plate after culturing seawater collected from a seaweed farming system according to one embodiment and a comparative example of the present invention. Figure 8 shows the change in the number of general bacteria according to the sterilization time of seawater collected from a seaweed farming system according to one embodiment and a comparative example of the present invention. Figure 9 shows the change in TRO according to the sterilization time of seawater collected from a seaweed farming system according to one embodiment and a comparative example of the present invention. Figure 10 shows the results of measuring the number of viable bacteria in seawater collected from a seaweed farming system according to one embodiment and a comparative example of the present invention at the National Institute of Fisheries Science. Specific details for implementing the invention

[0024] Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the drawings.

[0025] The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0027] FIGS. 1 and 2 are schematic diagrams of a seaweed farming system according to one embodiment of the present invention, and FIG. 3 shows the Venturi tube and plasma reactor of the present invention in more detail.

[0029] Hereinafter, a seaweed farming system according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

[0031] The above seaweed farming system may include a tank (100) for receiving a fluid and seaweed floating inside the fluid; a filter unit (200) received inside the tank (100) for passing the fluid and filtering the seaweed; and a circulation unit (300) configured to allow the fluid that has passed through the filter unit (200) to circulate.

[0032] The above-mentioned tank (100) is a place for cultivating seaweed by floating it in a fluid, the fluid being seawater, preferably supplied with nutrients, and the temperature being maintained at 10 to 16°C. The fluid may be cooled by a temperature maintenance device (not shown) so that the temperature is maintained at a low temperature.

[0033] Even after the above-mentioned nutrients are supplied to the fluid (seawater) for seaweed cultivation, a large amount of the nutrients remain in the fluid. If the fluid is used only once for seaweed cultivation and then discarded, a large amount of nutrients is lost. Therefore, it is desirable to circulate and reuse the fluid used for seaweed cultivation.

[0034] In addition, the fluid (seawater) flowing into the tank (100) for use in seaweed farming must be cooled to a temperature of 10 to 16°C before being introduced, which consumes a lot of energy. Therefore, if the fluid, which is already maintained at a low temperature, is circulated and reused, a lot of energy can be saved.

[0035] The above tank (100) can accommodate a fluid and seaweed floating inside the fluid, and the seaweed can float in multiple directions in the above tank (100). The above tank (100) can be formed in a long cylindrical shape, with the direction perpendicular to the ground being long in the longitudinal direction.

[0036] The above fluid refers to a fluid containing at least one of seawater and freshwater, and can create an environment where the laver can be cultivated. In this embodiment, the organism floating inside the fluid is described as the laver, but it is not limited to any organism that can be cultivated while floating inside the fluid.

[0037] The filter section (200) is intended to prevent the cultivated seaweed from being mixed with the fluid and lost, and may be in the form of a plurality of holes. The fluid passes through the holes and flows into the circulation section (300).

[0038] The size of the above hole may be 1.5 mm to 2.5 mm.

[0039] Although not shown in the drawing, the filter unit (200) may further include a fluid injection unit. The fluid injection unit may spray fluid to prevent steam from adhering to the filter unit (200). The fluid injection unit may receive fluid to be sprayed from a sterilization tank (310) to be described later.

[0040] The above fluid injection unit is positioned adjacent to the filter unit (200) and can inject fluid in a direction perpendicular to or parallel to the longitudinal direction of the water tank (100). At this time, the fluid injection unit may inject toward the lower surface of the filter unit (200), and is not limited thereto as long as it serves to prevent steam from adhering to the filter unit (200).

[0041] The above fluid injection unit may be formed in an L-shape, and one end of the fluid injection unit may be connected to the sterilization tank together with a pump and extended along the opposite direction of the length direction (direction perpendicular to the ground) of the water tank (100), and the other end of the fluid injection unit may be formed to be extended along the direction perpendicular to the length direction (direction parallel to the ground) when separated by a certain distance from the filter unit (200).

[0042] The above circulation unit (300) may include: a sterilization tank (310) into which the fluid is introduced; a venturi tube (330) connected to the sterilization tank (310) and supplying ozone to the fluid; a plasma reactor (340) connected to the venturi tube (330); and a circulation pump (320) formed to allow the fluid to be reintroduced into the interior of the water tank (100).

[0043] The fluid from the water tank (100) can be introduced into the sterilization tank (310) through the filter section (200).

[0044] The fluid introduced into the sterilization tank (310) can be transferred to the venturi tube (330) through the circulation pump (320). A gas containing ozone supplied from the plasma reactor (340) is supplied to the fluid transferred to the venturi tube (330) to sterilize it, and the sterilized fluid can be returned to the sterilization tank (310) or supplied directly to the water tank (100). In other words, if only one of the circulation pumps (320) connected to the venturi tube (330) is used, the sterilization tank (310) and the water tank (100) may be directly connected. Alternatively, water can be recirculated from the sterilization tank (310) to the water tank (100) using the circulation pump (320). In the case where multiple tanks are used instead of a single tank as in Fig. 2, it may be preferable to have an additional circulation pump (320) that recirculates fluid from the sterilization tank (310) to the tank (100) in addition to the circulation pump (320) connected to the venturi tube (330).

[0045] As the fluid is recirculated by the above circulation pump (320), a water flow is naturally generated, allowing the seaweed to continuously come into contact with air in multiple directions, thereby increasing the seaweed cultivation rate.

[0046] Although not illustrated in the drawings, the seaweed farming system of the present invention may further include a water flow generating unit for each tank (100). The water flow generating unit generates a water flow within the tank (100) to increase the seaweed farming rate.

[0047] The above-mentioned water flow generating unit may be configured to generate water flow in a spiral direction and may be configured to be tilted 40-50 degrees from the longitudinal direction of the water tank (100). The water flow is generated in a spiral direction due to the tilted angle.

[0048] The above-mentioned water flow generating unit may preferably be provided in multiple numbers, and the water flow generating unit may be provided in multiple numbers to generate water flow in various directions, thereby configuring the air to float in multiple directions within the fluid. When the air comes into contact with the air contained in the fluid from multiple directions, the cultivation rate may be improved.

[0049] The ozone-containing gas supplied from the plasma reactor (340) may contain not only ozone but also carbon dioxide contained in the air. Since the carbon dioxide is necessary for photosynthesis for seaweed growth and is included in the gas supplied from the plasma reactor (340), there is no need to supply separate carbon dioxide to the water tank (100).

[0050] The above plasma reactor (340) may include a cylindrical quartz tube (341) with one end open; an iron wire (343) inserted into the quartz tube through the opening; and a copper film (342) covering at least a portion of the outer wall of the quartz tube.

[0051] The above iron wire (343) is used as a high-voltage electrode and the above copper thin film (342) is used as a ground electrode, and a high voltage is applied to the two electrodes to generate plasma and ozone.

[0052] The above plasma reactor (340) is connected to the above Venturi tube (330) without applying separate power, so air is introduced through the opening of the above quartz tube (341) due to the pressure difference.

[0053] Therefore, the ozone and the air can be supplied together to the venturi tube (330).

[0054] The above-mentioned venturi tube (330) can be connected to the plasma reactor (340) through: a cylindrical ozone supply hose (344) having a hollow formed at the other end opposite to the one end (the end where the opening is formed) of the plasma reactor (340); and an ozone supply unit (345) connected to the ozone supply hose (344) and connected to the inside of the venturi tube (330).

[0055] The ozone supply unit (345) may be a T-shaped branch pipe, and may be composed of a vertical pipe (345a) extending in the same direction as the length of the venturi pipe and a horizontal pipe (345b) extending in a direction perpendicular to the direction.

[0056] The horizontal pipe (345b) may be connected to the ozone supply hose (344), and the vertical pipe (345a) may be connected to the venturi pipe (330).

[0057] The above-mentioned venturi tube (330) may include a fluid inlet (331) into which the fluid flows and a fluid outlet (334) into which the fluid flows out.

[0058] The above-mentioned venturi tube (330) may include: a concave portion (332) located near the center of the venturi tube (330) and having an inner diameter that decreases as it moves from the fluid inlet (331) toward the center; and a convex portion (333) having a convex shape in which the inner diameter gradually increases and then gradually decreases as it moves from near the center of the venturi tube (330) toward the fluid outlet (334).

[0059] The inner diameter of the end portion of the vertical pipe (345a) of the ozone supply unit (345) on the side of the fluid inlet (331) may be larger than the inner diameter of the venturi tube (330). In this case, the inner wall of the vertical pipe (345a) may correspond to the outer wall of the concave portion (332).

[0060] The inner diameter of the end portion of the vertical tube (345a) toward the fluid outlet (334) may be smaller than the inner diameter of the venturi tube (330). In this case, the outer wall of the vertical tube (345a) may correspond to the inner wall of the venturi tube (330), and the end portion of the vertical tube (345a) toward the fluid outlet (334) and the end portion of the convex portion (333) may come into contact with each other.

[0061] Due to the shape of the concave portion (332) and convex portion (333) of the above-mentioned Venturi tube (330) and the vertical tube (345a) of the above-mentioned ozone supply unit (345), low pressure can be formed downstream of the fluid inlet (331) where the fluid flows in, and high pressure can be formed upstream of the fluid outlet (334) where the fluid flows out. As a result, as described above, the gas containing ozone generated in the above-mentioned plasma reactor (340) is completely mixed with the fluid and transferred to the above-mentioned sterilization tank (310).

[0062] This pressure difference can also help generate water flow in the above-mentioned tank (100), and by generating water flow along with the air necessary for the growth of seaweed, the seaweed cultivation rate can be increased.

[0063] The number of the above-mentioned water tanks (100) is not limited, but it is preferable to connect them to the sterilization tank (310) only to the extent that the disease-inhibiting effect of the sterilized fluid is not reduced.

[0064] Although not shown in the drawing, the above seaweed farming system may include a discharge section.

[0065] The above seaweed farming system can discharge the seaweed and the fluid contained within the tank (100) through the discharge section. The seaweed and the fluid can pass through a hole formed in the lower part of the tank (100), pass through a discharge path, and be collected in a harvesting tank (not shown). Therefore, the seaweed farming system can also facilitate the harvesting of seaweed.

[0066] The above discharge section may include a discharge valve (not shown) configured to enable ON / OFF operation for discharging the fluid into the harvesting tank. The discharge valve may be positioned at the bottom of the tank (100).

[0068] Hereinafter, the method of operating the seaweed farming system of the present invention will be described in detail.

[0069] The fluid is transferred from the above-mentioned fluid and the above-mentioned fluid-floating seaweed tank (100) through the above-mentioned filter unit (200) that filters the seaweed, to the above-mentioned sterilization tank (310).

[0070] The fluid transferred to the above sterilization tank (310) is transferred to the above Venturi tube (330) by the above circulation pump (320).

[0071] The above-mentioned venturi tube (330) is formed such that the fluid inlet (331) where the fluid enters has a lower pressure than the fluid outlet (334) where the fluid exits from the venturi tube (330), so that the fluid can be transferred through the venturi tube (330) and through the fluid outlet (334) to the sterilization tank (310).

[0072] At this time, air containing ozone is supplied from a plasma reactor (340) connected to the venturi tube (330) so that the fluid can be sterilized to prevent disease in the seaweed.

[0073] The reason for connecting and using the above-mentioned venturi tube (330) and the above-mentioned plasma reactor (340) is to induce complete mixing of the ozone-containing plasma gas and the fluid (seawater) in the above-mentioned venturi (330).

[0074] In addition, when the Venturi tube (330) and the plasma reactor (340) are connected, no additional power (pump) is required to transport the plasma gas containing ozone from the plasma reactor (340) to the plasma reactor (340) due to the pressure difference. Therefore, the system is simpler and requires less power.

[0075] The fluid transferred to the sterilization tank is recirculated back to the water tank (100), so that the fluid containing nutrients and at a low temperature is not lost, making it possible to produce excellent seaweed farming economically.

[0077] [Example]

[0079] Example: Manufacture of a seaweed farming system

[0080] A portion of the seaweed farming system of the present invention was implemented on a laboratory scale. It consisted of a sterilization tank, a circulation pump, an ejector (Venturi tube), and a plasma reactor. Power was supplied at 150V via a slider (TF-075, Daekwang Slidedax, Korea) to the high-voltage generator (Neon Transformer, DKNE-18, DK Electric, Korea) connected to the plasma reactor. The sterilization tank was constructed using a cylindrical acrylic tube (thickness 5 mm) with a diameter of 150 mm and a height of 1,000 mm. Seawater inside the sterilization tank was directed by the circulation pump (R220-300, KOTEC, Korea) to pass through the ejector (0287 N-PVDF, Mazzel, USA) and re-enter the sterilization tank. At this time, the flow rate of seawater supplied to the ejector was 2.3 L / min. The ejector was connected to the circulation pump to allow the seawater in the sterilization tank to pass through the ejector, thereby mixing the ozone generated in the plasma reactor with the seawater. Ozone was supplied to the sterilization tank twice a day (9:00 AM and 5:00 PM) for 6 minutes, with an ozone concentration of 200 ppm and a flow rate of 0.7 L / min. In addition, air was supplied through a diffuser connected to an air blower to continuously circulate the seawater in the sterilization tank. The supplied air was 0.5 L / min. The manufactured example is shown in Fig. 4. Fig. 4 (a) is a photograph of the sterilization tank and (b) is a photograph of the plasma reactor.

[0082] Comparative Example: Manufacture of a seaweed farming system without ozone supply

[0083] A seaweed farming system was manufactured with the same configuration as the example, except that ozone was not supplied through a plasma reactor.

[0085] [Test Example]

[0087] Test Example 1: Confirmation of sterilization effect of ozone according to sterilization time

[0088] Seawater collected in the examples and comparative examples was plated onto TSA (Tryptic Soy Agar, KisanBio, Korea) medium plates supplemented with 1% NaCl and incubated at 35°C for 24 hours. After incubation, the plates were photographed and are shown in Figures 5 to 7. For sample collection, 0.1 mL was taken 1 hour after ozone injection and plated onto the TSA medium plates. Changes in the total bacterial count according to sterilization time are shown in Figure 8.

[0089] Referring to FIGS. 5 to 8, the seaweed farming system according to the embodiment showed that the number of general bacteria disappeared at a much faster rate compared to the comparative example, confirming the sterilization effect of ozone.

[0091] Test Example 2: Change in TRO according to sterilization time

[0092] Figure 9 shows the change in TRO according to sterilization time. Ozone was injected twice daily, at 9:00 AM and 5:00 PM, at 200 ppm for 6 minutes.

[0093] Referring to Figure 9, it was found that TRO increased immediately after ozone was injected and decreased when ozone was not injected.

[0094] This is believed to be because TRO is reduced by degassing or decomposition of organic matter by the continuous supply of air or organic matter in the water.

[0096] Test Example 3: Measurement of viable cell count

[0097] Figure 10 shows the results of measuring the viable cell count at the National Institute of Fisheries Science for samples (samples collected according to the example and comparative example) 14 days after the start of sterilization in Test Example 1. The samples were placed in a 1L sterile bag, refrigerated, and sent to the National Institute of Fisheries Science (located in Gijang-gun, Busan Metropolitan City) for analysis.

[0098] As shown in Fig. 10, the number of viable cells in the experimental group (Example) sterilized for 14 days was 0 CFU / mL, and the number of viable cells in the control group (Comparative Example) was 180 CFU / mL. Therefore, it was confirmed that the sterilization efficiency of the seaweed farming system combined with the plasma reactor of the present invention achieved 99.99% or higher.

[0100] Although the invention has been described with reference to the above embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as described in the following claims. Explanation of the symbols

[0101] 100: Water tank 200: Filter section 300: Circulation section 310: Sterilization tank 320: Circulation pump 330: Venturi tube 331: Fluid inlet 332: Recess 333: Convex part 334: Fluid outlet 340: Plasma reactor 341: Quartz tube 342: Copper film 343: Iron wire 344: Ozone supply hose 345: Ozone supply unit 345a: Vertical pipe 345b: Horizontal pipe

Claims

Claim 1 A tank for receiving a fluid and seaweed floating inside the fluid; a filter unit received inside the tank for passing the fluid and filtering the seaweed; and a circulation unit configured to allow the fluid that has passed through the filter unit to circulate, wherein the circulation unit comprises: a sterilization tank into which the fluid is introduced; a venturi tube connected to the sterilization tank and supplying ozone to the fluid; a plasma reactor connected to the venturi tube; and a circulation pump formed to allow the fluid to be reintroduced into the tank; wherein the venturi tube is a cylindrical ozone supply hose having a hollow formed at the other end opposite to one end of the plasma reactor; A seaweed farming system in which a fluid transferred to the Venturi tube via the ozone supply unit, which is connected to the ozone supply hose and connected to the inside of the Venturi tube, is connected to the plasma reactor, wherein the ozone supply unit is a T-shaped branch pipe and is composed of a vertical pipe extending in the same direction as the length of the Venturi tube and a horizontal pipe extending in a direction perpendicular to said direction, wherein the horizontal pipe is connected to the ozone supply hose and the vertical pipe is connected to the Venturi tube, and the fluid is sterilized as a gas containing ozone supplied from the plasma reactor is supplied. Claim 2 A seaweed farming system according to claim 1, wherein the plasma reactor comprises: a cylindrical quartz tube with one end open; an iron wire inserted into the quartz tube through the opening; and a copper film covering at least a portion of the outer wall of the quartz tube. Claim 3 delete Claim 4 delete Claim 5 A seaweed farming system according to claim 1, characterized in that the venturi tube includes a fluid inlet through which the fluid flows in and a fluid outlet through which the fluid flows out. Claim 6 A seaweed farming system according to claim 5, wherein the venturi tube comprises: a concave portion located near the center of the venturi tube, wherein the inner diameter decreases as it moves from the fluid inlet toward the center; and a convex portion having a convex shape, wherein the inner diameter gradually increases and then gradually decreases as it moves from near the center of the venturi tube toward the fluid outlet. Claim 7 A seaweed farming system according to claim 6, characterized in that the inner diameter of one end of the vertical pipe on the fluid inlet side is larger than the inner diameter of the venturi tube. Claim 8 A seaweed farming system according to claim 7, characterized in that the inner diameter of one end of the vertical pipe on the fluid outlet side is smaller than the inner diameter of the venturi tube.

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