WO2024123120A1 - Desalination aquaculture facility and desalination method for desalination aquaculture facility - Google Patents

Abstract

A desalination aquaculture facility comprises: a desalination apparatus which filters and desalinates brackish water to provide filtered fresh water; a first circulation filtration apparatus which re-filters the filtered fresh water provided from the desalination apparatus; and a second circulation filtration apparatus which receives non-desalinated, concentrated brackish water from the desalination apparatus and re-filters the received concentrated brackish water. The desalination apparatus comprises: a brackish water supply unit for supplying brackish water; a brackish water filtration unit which filters out foreign substances from the brackish water supplied from the brackish water supply unit; and a desalination unit which desalinates the filtered brackish water filtered in the brackish water filtration unit, supplies the desalinated filtered fresh water to the first circulation filtration apparatus, and supplies the non-desalinated, concentrated brackish water to the second circulation filtration apparatus.

Description

Desalination aquaculture facility and desalination treatment method of desalination aquaculture facility

The present invention relates to a desalination aquaculture facility and a desalination treatment method for a desalination aquaculture facility.

In general, migratory fish species refer to fish that migrate for spawning and wintering. Recently, as the consumption of migratory fish species (eg, salmon) has become more active, migratory farming of migratory fish species has been greatly developed.

For migratory fish farming, different aquaculture water is required for each growth stage of the migratory fish species. For example, seedlings and juveniles of migratory fish species require fresh water, and adult fish require brackish water.

However, depending on the location of the fish farm for migratory aquaculture, it is not easy to secure fresh and brackish water of good quality, making it difficult to proceed with the aquaculture project for migratory fish species. For example, aquaculture water used for cultivating migratory fish species can be divided into fresh water, brackish water, and sea water. Although there are differences depending on the region, brackish water is mostly distributed in coastal areas, making it difficult to secure fresh water of good quality.

Accordingly, it is possible to construct a fish farm that can secure fresh water of good quality regardless of regional characteristics, and technology is required to minimize pollution of the surrounding environment caused by effluent from the farm by maximizing the use of effluent discharged from the farm. there is.

Embodiments of the present invention were invented with the above background in mind, and are intended to provide a desalination aquaculture facility that can secure fresh water of good quality and a desalination treatment method for the desalination aquaculture facility.

In addition, embodiments of the present invention seek to provide a desalination aquaculture facility and a desalination treatment method for the desalination aquaculture facility that can minimize pollution of the surrounding environment due to effluent discharged from the fish farm.

A desalination aquaculture facility according to the first aspect of the present invention includes a desalination device for filtering and desalinating brackish water to provide filtered fresh water; a first circulation filtration device for re-filtering the filtered fresh water provided from the desalination device; and a second circulation filtration device that receives concentrated brackish water discharged from the desalination device without being desalinated and re-filters the received concentrated brackish water, wherein the desalination device includes: a brackish water supply unit for supplying the brackish water; a brackish water filtering unit that filters foreign substances from the brackish water supplied from the brackish water supply unit; and a desalination treatment unit that desalinates the filtered brackish water filtered in the brackish water filtration unit, supplies the desalinated filtered fresh water to the first circulation filtration device, and supplies the non-desalinated concentrated brackish water to the second circulation filtration device. Includes.

In addition, the desalination device may further include a hydroponic cultivation device that receives backwash water that has not been filtered in the brackish water filtration unit from the desalination device and uses the provided backwash water for hydroponic cultivation of plants.

In addition, the desalination device may further include a brackish water sterilization unit that receives the filtered brackish water from the brackish water filtration unit, sterilizes it, and supplies the sterilized brackish water to the desalination treatment unit.

In addition, the desalination device may further include a flow rate control unit that provides the salt to the second circulation filtration device when the salt concentration including the concentrated brackish water and the sterilized brackish water is lower than a preset reference salt concentration range. there is.

In addition, the flow rate control unit includes a salt injection tank containing mixed water containing salt; a salt tank control valve for controlling the flow rate of the mixed water supplied to the second circulation filtration device; a salinity meter for measuring the salt concentration of the concentrated brackish water and the sterilized brackish water; And it may include a controller that adjusts the salt tank control valve so that the salt concentration satisfies a preset standard salt concentration range.

In addition, the first circulation filtration device includes a first tank portion that receives and stores the filtered fresh water from the desalination device; a first filter unit that receives the filtered fresh water from the first tank unit and biologically filters the filtered fresh water; a first sterilizing unit that receives the filtered fresh water from the first filter unit and sterilizes it; And it may include a first degassing unit for degassing the filtered fresh water sterilized in the first sterilizing unit.

In addition, the first circulation filtration device includes a first oxygen unit supplying oxygen to the filtered fresh water provided from the first degassing unit; a first water tank that receives the filtered fresh water from the first oxygen unit and stores the filtered fresh water as circulating water; and a first filtering unit that filters foreign substances of a predetermined size or larger from the circulating water provided from the first water tank, wherein the circulating water in which the foreign substances have been filtered, together with the filtered fresh water discharged from the first tank unit, It may be re-supplied to the first filter unit and circulated.

In addition, the second circulation filtration device includes a second tank portion that receives and stores the concentrated brackish water from the desalination device; a second filter unit that receives the concentrated brackish water from the second tank unit and biologically filters the concentrated brackish water; a second sterilizing unit that receives the concentrated brackish water from the second filter unit and sterilizes it; And it may include a second degassing unit for degassing the concentrated brackish water sterilized in the second sterilizing unit.

In addition, the second circulation filtration device includes a second oxygen unit supplying oxygen to the concentrated brackish water provided from the second degassing unit; a second water tank that receives the concentrated brackish water from the second oxygen unit and stores the concentrated brackish water as circulating water; and a second filtering unit that filters foreign substances of a predetermined size or larger from the circulating water provided from the second water tank, wherein the circulating water in which the foreign substances have been filtered, together with the concentrated brackish water discharged from the second tank unit, It may be re-supplied to the second filter unit and circulated.

In addition, the second circulation filtration device includes a denitrification unit that denitrifies circulating water that requires denitrification among the circulating water discharged from the second filter unit; And it may further include a dephosphorization unit for dephosphorizing circulating water that requires dephosphorization among the circulating water discharged from the second filter unit.

The desalination treatment method according to the second aspect of the present invention is a desalination treatment method in a desalination aquaculture facility in which brackish water is filtered and desalinated to provide filtered fresh water, comprising: a brackish water supply step of supplying brackish water; A brackish water filtration step of filtering out foreign substances from the supplied brackish water; A brackish water desalination step in which the filtered brackish water from which foreign substances have been filtered is desalinated; And a culture water supply step of re-filtering the desalinated filtered fresh water and supplying it to the fresh water farm, and supplying non-desalinated concentrated brackish water to the brackish water farm.

In addition, the desalination treatment method may further include a water sterilization step of sterilizing the filtered brackish water before desalination treatment of the filtered brackish water.

Additionally, in the brackish water filtration step, backwash water in which foreign substances have not been filtered from the brackish water can be supplied to a hydroponic cultivation area and used for hydroponic cultivation of plants.

In addition, in the aquaculture water supply step, a portion of the filtered fresh water re-filtered from the freshwater aquaculture farm may be supplied to the hydroponic cultivation field in order to control the salinity concentration of the hydroponic cultivation field.

According to embodiments of the present invention, by filtering, sterilizing and desalinating abundant brackish water in coastal areas, fresh water of good quality can be secured, aquaculture water suitable for the growth stage of migratory fish species can be smoothly provided, and regional Regardless of the characteristics, construction of fish farms can be promoted.

In addition, according to embodiments of the present invention, by filtering and sterilizing the discharge water from the fish farm while circulating it, discharge water from the fish farm can be reduced and pollution to the surrounding environment of the fish farm can be minimized.

Additionally, according to embodiments of the present invention, unfiltered backwash water from the brackish water filtration unit of a desalination aquaculture facility can be used for hydroponic cultivation of plants.

In addition, according to embodiments of the present invention, by appropriately controlling the flow rate of sterilized brackish water discharged from the brackish water sterilization unit of the desalination aquaculture facility and the flow rate of concentrated brackish water discharged from the desalination treatment unit, aquaculture suitable for each stage of growth of migratory fish species Water can be provided to the fish farm.

Figure 1 is a configuration diagram showing the schematic configuration of a desalination aquaculture facility according to an embodiment of the present invention.

Figure 2 is a configuration diagram showing the specific configuration of a desalination aquaculture facility according to an embodiment of the present invention.

Figure 3 is a state diagram showing an application example of a desalination aquaculture facility according to an embodiment of the present invention.

Figure 4 is a flowchart explaining an actual example of a desalination aquaculture facility according to salinity, according to an embodiment of the present invention.

Figure 5 is a graph showing the flow rate of sterilized brackish water and concentrated brackish water according to the flow rate of the brackish water filtration unit, according to an embodiment of the present invention.

Figure 6 is a block diagram showing a desalination treatment method of a desalination aquaculture facility according to an embodiment of the present invention.

Hereinafter, specific embodiments for implementing the technical idea of the present invention will be described in detail with reference to the drawings.

In addition, when describing the present invention, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description will be omitted.

Additionally, when it is mentioned that a component is 'delivered', 'provided', or 'supplied' to another component, it is understood that it may be delivered, provided, or supplied directly to the other component, but that other components may exist in the middle. It should be.

The terms used in this specification are merely used to describe specific embodiments and are not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

Additionally, terms including ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by these terms. These terms are used only to distinguish one component from another.

As used in the specification, the meaning of "comprising" is to specify a specific characteristic, area, integer, step, operation, element, and/or component, and to specify another specific property, area, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of .

In addition, it should be noted in advance that expressions such as upper and lower sides in this specification are explained based on the drawings, and may be expressed differently if the direction of the object in question changes.

Hereinafter, the specific configuration of a desalination aquaculture facility according to an embodiment of the present invention will be described with reference to the drawings.

Referring to Figures 1 to 3, the desalination aquaculture facility (1) according to an embodiment of the present invention can secure fresh water of good quality and minimize pollution of the surrounding environment due to effluent discharged from the fish farm. there is. This desalination aquaculture facility may include a desalination device 10, a first circulation filtration device 20, a second circulation filtration device 30, and a hydroponic cultivation device 40.

The desalination device 10 can provide good fresh water by filtering, sterilizing, and desalinating brackish water. Brackish water can be understood as water where salt water and fresh water are mixed and the amount of salt is less than that of sea water. In this example, the salinity concentration of seawater is described as 30 ppt or more, the salinity concentration of brackish water is 0.5 to 17 ppt, and the salinity concentration of fresh water is 0.5 ppt or less. However, the salinity concentration varies somewhat depending on the region, season, and amount of precipitation. It can be.

The desalination device 10 may include a brackish water supply unit 100, a brackish water filtration unit 200, a brackish water sterilization unit 300, a flow rate control unit 400, and a desalination treatment unit 500. The brackish water supply unit 100 can receive brackish water from the outside and store it. As an example, the brackish water supply unit 100 may be in the form of a tank with a certain volume that can accommodate brackish water. The brackish water supply unit 100 can receive brackish water with a salinity of 5 to 10 ppt from the outside, and the flow rate of the brackish water can be 5,100 tons/day. The brackish water supply unit 100 may supply brackish water received from outside to the brackish water filtering unit 200 .

In this embodiment, the flow rate of brackish water supplied to the desalination device 10 through the brackish water supply unit 100 has been described as 5,100 tons/day, but is not limited thereto, and the brackish water supply unit 100 The flow rate of brackish water supplied to the desalination device 10 may vary depending on the facility size, facility conditions, surrounding environment, etc.

The brackish water filtering unit 200 may filter foreign substances from brackish water supplied from the brackish water supply unit 100. The brackish water filtering unit 200 may be one or more of an MF filter (Microfiltration filter) and an UF filter (Ultrafiltration Membrane) that can filter foreign substances (including organic substances) of a predetermined size or larger. The MF filter may be a precision fine filter that filters micro-scale particles using a fine filtration membrane. Substances to be removed by the MF filter include colloidal particles, suspensions, algae, or bacteria. A UF filter may be a fine filter that filters out harmful substances such as viruses and bacteria using a microfiltration membrane. UF filters can be used multiple times by washing.

The brackish water filtered in the brackish water filtering unit 200, that is, the filtered brackish water, may be provided to the brackish water sterilizing unit 300. Foreign substances remaining in the brackish water filtering unit 200 because they are not filtered in the brackish water filtering unit 200 may be supplied to the hydroponic cultivation device 40 along with the backwashing water during the backwashing process for the brackish water filtering unit 200. . In this embodiment, when the flow rate of brackish water supplied from the brackish water supply unit 100 is 5,100 tons/day, the flow rate of filtered brackish water provided from the brackish water filtering unit 200 to the brackish water sterilizing unit 300 may be 5,000 tons/day, and the flow rate of backwash water provided from the brackish water filtration unit 200 to the hydroponic cultivation device 40 may be 100 tons/day.

The brackish water sterilizing unit 300 may receive filtered brackish water filtered by the brackish water filtration unit 200 and sterilize it. The brackish water sterilizing unit 300 can kill microorganisms contained in filtered brackish water by applying physical/chemical stimulation to the microorganisms. As an example, the raw water sterilizing unit 300 may be a sterilizing device using ultraviolet rays (UV) or ozone. The brackish water sterilization unit 300 may supply sterilized filtered brackish water, that is, sterilized brackish water, to the desalination treatment unit 500.

The brackish water sterilization unit 300 may also supply sterilized brackish water to the second circulation filtration device 30 in order to control the salinity of the brackish water in the second circulation filtration device 30 . In this embodiment, when the flow rate of brackish water supplied from the brackish water supply unit 100 is 5,100 tons/day, the flow rate of sterilized brackish water discharged from the brackish water sterilizing unit 300 is 1,333 tons/day. It can be a day.

The flow rate control unit 400 may include a flow meter 410, a salt tank control valve 420, a salinity meter 433, a salt injection tank 440, and a controller 450. The flow meter 410 can measure the flow rate of mixed water moving from the salt injection tank 440 to the second circulation filtration device 30. Flow information measured by the flow meter 410 may be transmitted to the controller 450.

The salt tank control valve 420 can control the flow rate of mixed water supplied from the salt injection tank 440 to the second circulation filtration device 30. The salt tank control valve 420 may be a valve that selectively opens and closes the flow path of the mixed water discharged from the salt injection tank 440. The salt tank control valve 420 can control the flow rate passing through the pipe by adjusting the volume (disk orbit) of the valve through an actuator. The operation of the salt tank control valve 420 can be controlled by the controller 450.

The salinity meter 433 can measure the salt concentration of concentrated brackish water and sterilized brackish water. Information on the salt concentration of concentrated brackish water and sterilized brackish water measured by the salinity meter 433 may be applied to the controller 450. This salinity meter 433 is installed in the second circulation filtration device 30 and can measure the salt concentration of the mixed water containing concentrated brackish water and sterilized brackish water. Meanwhile, as another example, the salinity meter 433 may measure the salt concentration of the concentrated brackish water of the desalination treatment unit 500 and the sterilized brackish water of the brackish water sterilization unit 300. In this case, the controller 450 can predict in advance the salt concentration of the mixed water when the concentrated brackish water and the sterilized brackish water are mixed with each other, based on the salt concentration of each concentrated brackish water and sterilized brackish water measured through the salinity meter 433. there is.

The salt injection tank 440 may be a salt injection tank containing mixed water that can provide salt to the second circulation filtration device 30. When the salt concentration of the mixed water in the second circulation filtration device 30 is lower than the preset reference salt concentration, mixed water containing salt may be provided to the second circulation filtration device 30. The operation of the salt injection tank 440 can be controlled by the controller 450.

The controller 450 can control the operation of the flow meter 410, the salt tank control valve 420, and the salt injection tank 440. The controller 450 controls the flow meter 410, the salt tank control valve 420, and the salt injection tank 440 to maintain the salt concentration of the mixed water within a preset standard salt concentration range. The controller 450 may be implemented by an arithmetic device including a microprocessor, memory, etc., and since the implementation method is obvious to those skilled in the art, further detailed description will be omitted.

The desalination treatment unit 500 may receive sterilized brackish water filtered from the brackish water filtration unit 200 and perform desalination treatment. The desalination treatment unit 500 may be a brackish water reverse osmosis (BWRO) treatment device capable of desalinating brackish water. The desalination treatment unit 500 may supply desalinated sterilized brackish water, that is, filtered fresh water, to the first circulation filtration device 20 . In this embodiment, when the flow rate of brackish water supplied from the brackish water sterilization unit 300 is 3,667 tons/day, the flow rate of filtered fresh water discharged from the desalination treatment unit 500 is 1,000 tons/day. It may be a day, and the salinity concentration of fresh water desalinated through the desalination treatment unit 500 may be 0.1 ppt.

In addition, the desalination treatment unit 500 may supply the remaining sterilized brackish water, that is, concentrated brackish water, which has an increased salt concentration due to not being desalinated, to the second circulation filtration device 30. In this embodiment, when the flow rate of brackish water supplied from the brackish water sterilization unit 300 is 3,667 tons/day, the concentrated brackish water provided from the desalination treatment unit 500 to the second circulation filtration device 30 The flow rate may be 333 tons/day, and the salt concentration of the concentrated brackish water may be 20 to 40 ppt.

The first circulation filtration device 20 can re-filter and circulate the filtered fresh water provided from the desalination device 10 and supply it to the freshwater fish farm. The first circulation filtration device 20 can circulate seedling/fry culture water that can be cultured in fresh water. This first circulation filtration device 20 includes a first tank unit 21, a first filter unit 22, a first sterilization unit 23, a first degassing unit 24, a first oxygen unit 25, It may include a first water tank 26 and a first filtration unit 27.

The first tank unit 21 can receive filtered fresh water from the desalination device 10 and store it. The filtered fresh water stored in the first tank unit 21 may be moved to the first filter unit 22. The first filter unit 22 can biologically filter the fresh water filtered in the fresh water tank or the first filter unit 27. The first filter unit 22 may be a filter that can remove various toxic substances or odorous substances using enzymes or microorganisms. The filtered fresh water filtered through the first filter unit 22 may be moved to the first sterilization unit 23. Poisonous substances or odorous substances that are not filtered in the first filter unit 22 may be discharged to the outside as sludge and then moved to a separate purification facility.

The first sterilizing unit 23 can receive filtered fresh water from the first filter unit 22 and sterilize it. This first sterilization unit 23 may be a sterilization device that kills microorganisms in filtered fresh water by applying physical/chemical stimulation to them. The filtered fresh water sterilized through the first sterilization unit 23 may be moved to the first degassing unit 24.

The first degassing unit 24 may deaerate carbon dioxide from the filtered fresh water sterilized in the first sterilizing unit 23. The first degassing unit 24 may be a degassing device capable of removing gas components such as carbon, carbon dioxide gas, and ammonia dissolved in filtered fresh water. Filtered fresh water from which carbon dioxide has been degassed through the first degassing unit 24 may be moved to the first oxygen unit 25.

The first oxygen unit 25 may supply oxygen to the filtered fresh water provided from the first degassing unit 24. The first oxygen unit 25 supplies high-purity oxygen to the filtered freshwater to increase the amount of dissolved oxygen in the filtered freshwater, thereby reducing the toxicity of ammonia in the filtered freshwater and helping the proliferation of aerobic components to contain harmful substances. can be removed. Filtered fresh water supplied with oxygen through the first oxygen unit 25 may be moved to the first water tank 26. The first water tank 26 can move the filtered fresh water supplied from the first oxygen unit 25 to the first filtration unit 27.

The first filter 27 may filter foreign substances larger than a predetermined size (for example, 40 μm or larger) from the filtered fresh water provided from the first water tank 26. As an example, the first filter 27 may be a mechanical filter capable of filtering feed or excrement contained in circulating filtered fresh water. The filtered fresh water filtered through the first filter unit 27 may be moved back to the first filter unit 22 and circulated.

In this way, the filtered fresh water in the first circulation filtration device 20 is supplied to the first filter unit 22, the first sterilization unit 23, the first degassing unit 24, the first water tank 26, and the first filtration unit. As filtration and sterilization are repeated while circulating through the unit 27, discharge water from the fish farm can be reduced and contamination of the surrounding environment of the fish farm can be minimized.

The second circulation filtration device 30 can re-filter and circulate the filtered brackish water provided from the desalination device 10 and supply it to the brackish water fish farm. The second circulation filtration device 30 can circulate adult fish culture water that can be cultured in brackish water. This second circulation filtration device 30 includes a second tank unit 31, a second filter unit 32, a second sterilization unit 33, a second degassing unit 34, a second oxygen unit 35, It may include a second water tank 36, a second filtration unit 37, a denitrification unit 38, and a dephosphorization unit 39.

The second tank unit 31 can receive filtered brackish water from the desalination device 10 and store it. The filtered water stored in the second tank unit 31 may be moved to the second filter unit 32. The second filter unit 32 can biologically filter the filtered brackish water filtered in the fresh water tank or the second filter unit 37. The second filter unit 32 may be a filter that can remove various toxic substances or odorous substances using enzymes or microorganisms. The filtered water filtered through the second filter unit 32 may be moved to the second sterilizing unit 33. Poisonous substances or odorous substances that are not filtered in the second filter unit 32 may be discharged to the outside as sludge and then moved to a separate purification facility.

The second sterilizing unit 33 can receive filtered water from the second filter unit 32 and sterilize it. This second sterilizing unit 33 may be a sterilizing device that can remove microorganisms in the filtered water by applying physical/chemical stimulation to the microorganisms. The filtered water sterilized through the second sterilizing unit 33 may be moved to the second degassing unit 34.

The second degassing unit 34 may deaerate carbon dioxide from the filtered water sterilized in the second sterilizing unit 33. The second degassing unit 34 may be a degassing device capable of removing gas components such as carbon, carbon dioxide gas, and ammonia dissolved in the filtered water. Filtered brackish water from which carbon dioxide has been degassed through the second degassing unit 34 may be moved to the second oxygen unit 35.

The second oxygen unit 35 may supply oxygen to the filtered brackish water provided from the second degassing unit 34. The second oxygen unit 35 supplies high-purity oxygen to the filtration brackish water to increase the amount of dissolved oxygen in the filtration brackish water, thereby reducing the toxicity of ammonia in the filtration brackish water and helping the proliferation of exhaled air components to contain harmful substances. can be removed. The filtered brackish water that has received oxygen through the second oxygen unit 35 may be moved to the second water tank 36. The second water tank 36 can move the filtered brackish water supplied from the second oxygen unit 35 to the second filtration unit 37.

The second filter 37 may filter foreign substances larger than a predetermined size (for example, 40 μm or larger) from the filtered water provided from the second water tank 36. As an example, the second filter 37 may be a mechanical filter capable of filtering feed or excrement contained in the circulating filter water. The filtered brackish water filtered through the second filter unit 37 may be moved back to the second filter unit 32 and circulated.

If denitrification and dephosphorus are required in the filtered water discharged from the second filter unit 32, the filtered water can be separated and subjected to denitrification and dephosphorus treatment. The denitrification unit 38 can decompose nitrogen in the filtered brackish water by reducing nitrate. For example, the denitrification unit 38 can change the organic nitrogen compounds contained in the filtered brackish water into nitrous acid and then nitric acid through nitrification, and convert them into nitrogen gas through anaerobic action to proceed with denitrification.

The dephosphorization unit 39 can remove phosphorus from the filtered brackish water. For example, the phosphorus removal unit 39 may remove phosphorus from filtered brackish water by a chemical method using chemical agents, or remove phosphorus from filtered brackish water by a biological method using microorganisms. The sludge discharged from the denitrification unit 38 and the dephosphorization unit 39 may be discharged to the outside and moved to a separate purification facility.

The hydroponic cultivation device 40 may receive unfiltered backwash water from the brackish water filtration unit 200 of the desalination device 10. The hydroponic cultivation device 40 can use the backwash water of the brackish water filter 200 provided from the desalination device 10 for hydroponic cultivation of plants. As an example, the hydroponic cultivation device 40 may include aquaponics that can cultivate plants hydroponically using organic matter generated while cultivating fish.

The hydroponic cultivation device 40 may receive fresh water from the first circulation filtration device 20. In this case, the hydroponic cultivation device 40 can adjust the salt concentration required for hydroponic cultivation by adjusting the mixing ratio of the backwash water provided from the desalination device 10 and the fresh water from the first circulation filtration device 20. In this embodiment, the flow rate of backwash water with a salinity concentration of 5 to 10 ppt provided from the brackish water filtration unit 200 of the desalination device 10 to the hydroponic cultivation device 40 is 100 tons/day, When the flow rate of fresh water with a salt concentration of 0.1 ppt provided from the first circulation filtration device 20 to the hydroponic cultivation device 40 is 440 tons/day, the mixed water in the hydroponic cultivation device 40 The flow rate is 440 tons/day, and the salt concentration of the mixed water can be maintained at 1 ppt.

[Example]

Referring to Figure 4, first, the salinity of adult fish farming water is measured. As a result of salinity measurement, if the initial salinity value of the aquaculture water is 12 ppt (+/- 0.5 ppt), the current operation status is maintained. At this time, operation of the salt tank control valve of the salt control tank is unnecessary. If the initial value of the salinity of the aquaculture water is less than 11.5 ppt, the opening/closing rate of the salt tank control valve of the salinity control tank is increased to an initial rate of, for example, 1%, and the salt dosing system operates. Thus, the salinity increases by, for example, 1 ppt/hr. If the initial value of the salinity of the aquaculture water is greater than 12.5 ppt, the opening/closing rate of the salinity tank control valve of the salinity control tank is reduced to an initial rate of, for example, 1%. The delay time can be set to 5 minutes.

When an emergency situation occurs in which the opening or closing of the flow control valve is not detected, an alarm may be generated. In addition, if the initial value of the salinity of the aquaculture water is greater than 14.0 ppt, the filtered water (or tap water) is transferred to the desalination treatment unit 500, which is a BWRO (Brackish Water Reverse Osmosis) treatment device, at an initial rate of, for example, 1 ppt/hr. supply, and measurement of aquaculture water salinity can be performed again. The delay time can be set to 5 minutes. Thereafter, the flow rate of concentrated water or brackish water may be repeatedly adjusted according to the salinity of the aquaculture water described above.

Meanwhile, a comparison table comparing the flow rates of sterilized brackish water and concentrated brackish water according to the flow rate of the brackish water filtration unit according to this embodiment is shown in Table 1 below. Based on Table 1, a graph comparing the flow rates of sterilizing water and concentrating water according to an embodiment of the present invention is shown in FIG. 5.

nine
minute 100 200 300 400 500 Brackish water supply department
(ton/day) Brackish water filtration unit
(ton/day) backwash water
(ton/day) Sterilizing water
(ton/day) Sterilizing water
(ton/day) concentrated brackish water
(ton/day) Filtered fresh water
(ton/day) One 638 625 13 625 458 42 125 2 1275 1250 25 1250 917 83 250 3 1913 1875 38 1875 1375 125 375 4 2550 2500 50 2500 1834 167 500 5 3188 3125 63 3125 2292 208 625 6 3825 3750 75 3750 2750 250 750 7 4463 4375 88 4375 3209 291 875 8 5100 5000 100 5000 3667 333 1000

Referring to Figure 6, the desalination treatment method (2) of the desalination aquaculture facility according to an embodiment of the present invention includes a brackish water supply step (S100), a brackish water filtration step (S200), a brackish water sterilization step (S300), and a brackish water desalination step. (S400) and a cultured water supply step (S500). In the brackish water supply step (S100), brackish water may be supplied through the brackish water supply unit 100 of the desalination device 10. Brackish water is water where seawater and freshwater are mixed and the amount of salt is less than that of seawater. In this embodiment, the salt concentration of brackish water may be 0.5 to 17 ppt. In the brackish water filtration step (S200), the desalination device (10) Foreign substances can be filtered from supplied brackish water. Filtering of brackish water may be performed in the brackish water filtration unit 200 of the desalination device 10. The brackish water filtering unit 200 can filter foreign substances (including organic substances) larger than a predetermined size.

In the brackish water filtration step (S200), backwash water in which foreign substances have not been filtered from brackish water can be supplied to the hydroponic cultivation field of the hydroponic cultivation device 40. In the hydroponic cultivation device 40, hydroponic cultivation of plants can be performed using backwash water.

In the brackish water sterilization step (S300), the filtered brackish water can be sterilized before desalinating the filtered brackish water. Sterilization of filtered brackish water may be performed in the brackish water sterilization unit 300 of the desalination device 10. The brackish water sterilizing unit 300 can kill microorganisms contained in filtered brackish water by applying physical/chemical stimulation to the microorganisms.

In the brackish water desalination step (S400), when the filtered brackish water is sterilized in the brackish water sterilization unit 300 of the desalination device 10, the sterilized brackish water can be desalinated. Desalination treatment for sterilized brackish water may be performed in the desalination treatment unit 500 of the desalination device 10. In the desalination treatment unit 500, a brackish water reverse osmosis (BWRO) process that can desalinate brackish water may be performed.

In the aquaculture water supply step (S500), the desalinated filtered fresh water can be re-filtered and supplied to the fresh water farm of the first circulation filtration device (20), and the concentrated brackish water that has not been desalinated can be supplied to the second circulation filtration device (30). It can be supplied to brackish water fish farms.

In the aquaculture water supply step (S500), in order to control the salinity concentration of the hydroponic cultivation field of the hydroponic cultivation device 40, a portion of the filtered fresh water refiltered from the freshwater aquaculture farm of the first circulation filtration device 20 is used in the hydroponic cultivation device 40. ) can be supplied to hydroponic cultivation areas.

As described above, the present invention can secure fresh water of good quality by filtering, sterilizing and desalinating abundant brackish water in coastal areas, smoothly providing aquaculture water suitable for the growth stage of migratory fish species, and regional characteristics. Regardless, it is possible to promote the construction of a fish farm, and there are excellent advantages such as reducing the discharge water from the farm and minimizing pollution to the surrounding environment of the farm by filtering and sterilizing the discharge water from the farm while circulating it.

Although embodiments of the present invention have been described above as specific embodiments, this is merely an example, and the present invention is not limited thereto, and should be construed as having the widest scope following the technical idea disclosed in this specification. A person skilled in the art may implement a pattern of a shape not specified by combining/substituting the disclosed embodiments, but this also does not depart from the scope of the present invention. In addition, a person skilled in the art can easily change or modify the embodiments disclosed based on the present specification, and it is clear that such changes or modifications also fall within the scope of the present invention.

Claims (14)

A desalination device that filters and desalinates brackish water to provide filtered fresh water; a first circulation filtration device for re-filtering the filtered fresh water provided from the desalination device; and A second circulation filtration device that receives concentrated brackish water discharged from the desalination device without being desalinated and re-filters the received concentrated brackish water, The desalination device is a brackish water supply unit for supplying the brackish water; a brackish water filtering unit that filters foreign substances from the brackish water supplied from the brackish water supply unit; and A desalination treatment unit that desalinates the filtered brackish water filtered in the brackish water filtration unit, supplies the desalinated filtered fresh water to the first circulation filtration device, and supplies the non-desalinated concentrated brackish water to the second circulation filtration device. doing, Desalination aquaculture facility. According to claim 1, Further comprising a hydroponic cultivation device that receives backwash water that has not been filtered in the brackish water filtration unit from the desalination device and uses the provided backwash water for hydroponic cultivation of plants, Desalination aquaculture facility. According to claim 1, The desalination device is Further comprising a brackish water sterilization unit that receives and sterilizes the filtered brackish water filtered by the brackish water filtration unit and supplies the sterilized brackish water to the desalination treatment unit, Desalination aquaculture facility. According to claim 3, The desalination device is When the salt concentration including the concentrated brackish water and the sterilized brackish water is lower than a preset reference salt concentration range, it further comprises a flow rate control unit that provides and delivers the salt to the second circulation filtration device, Desalination aquaculture facility. According to claim 4, The flow control unit A salt injection tank containing mixed water containing salt; a salt tank control valve for controlling the flow rate of the mixed water supplied to the second circulation filtration device; a salinity meter for measuring the salt concentration of the concentrated brackish water and the sterilized brackish water; and Comprising a controller that adjusts the salt tank control valve so that the salt concentration satisfies a preset standard salt concentration range, Desalination aquaculture facility. According to claim 1, The first circulation filtration device is a first tank unit that receives and stores the filtered fresh water from the desalination device; a first filter unit that receives the filtered fresh water from the first tank unit and biologically filters the filtered fresh water; a first sterilizing unit that receives the filtered fresh water from the first filter unit and sterilizes it; and Comprising a first degassing unit for degassing the filtered fresh water sterilized in the first sterilizing unit, Desalination aquaculture facility. According to claim 6, The first circulation filtration device is a first oxygen unit supplying oxygen to the filtered fresh water provided from the first degassing unit; a first water tank that receives the filtered fresh water from the first oxygen unit and stores the filtered fresh water as circulating water; and It further includes a first filtering unit that filters foreign substances of a predetermined size or larger from the circulating water provided from the first water tank, The circulating water from which the foreign substances have been filtered is, Together with the filtered fresh water discharged from the first tank unit, it is re-supplied and circulated in the first filter unit, Desalination aquaculture facility. According to claim 1, The second circulation filtration device is a second tank unit that receives and stores the concentrated brackish water from the desalination device; a second filter unit that receives the concentrated brackish water from the second tank unit and biologically filters the concentrated brackish water; a second sterilizing unit that receives the concentrated brackish water from the second filter unit and sterilizes it; and Comprising a second degassing unit for degassing the concentrated brackish water sterilized in the second sterilizing unit, Desalination aquaculture facility. According to claim 8, The second circulation filtration device is a second oxygen unit supplying oxygen to the concentrated brackish water provided from the second degassing unit; a second water tank that receives the concentrated brackish water from the second oxygen unit and stores the concentrated brackish water as circulating water; and It further includes a second filtering unit that filters foreign substances of a predetermined size or larger from the circulating water provided from the second water tank, The circulating water from which the foreign substances have been filtered is, Together with the concentrated brackish water discharged from the second tank unit, it is re-supplied to the second filter unit and circulated. Desalination aquaculture facility. According to claim 8, The second circulation filtration device is a denitrification unit that denitrifies circulating water that requires denitrification among the circulating water discharged from the second filter unit; and Further comprising a dephosphorization unit for dephosphorizing circulating water requiring dephosphorization among the circulating water discharged from the second filter unit, Desalination aquaculture facility. In the desalination treatment method of a desalination aquaculture facility that filters and desalinates brackish water to provide filtered fresh water, A brackish water supply step of supplying brackish water; A brackish water filtration step of filtering out foreign substances from the supplied brackish water; A brackish water desalination step in which the filtered brackish water from which foreign substances have been filtered is desalinated; and Comprising a culture water supply step of re-filtering the desalinated filtered fresh water and supplying it to the fresh water farm, and supplying non-desalinated concentrated brackish water to the brackish water farm. Desalination treatment method for desalination aquaculture facilities. According to claim 11, Further comprising a brackish water sterilization step of sterilizing the filtered brackish water before desalinating the filtered brackish water, Desalination treatment method for desalination aquaculture facilities. According to claim 11, The brackish water filtration step is Backwash water in which foreign substances have not been filtered from the brackish water is supplied to a hydroponic cultivation area and used for hydroponic cultivation of plants, Desalination treatment method for desalination aquaculture facilities. According to claim 13, The aquaculture water supply step is In order to control the salinity concentration of the hydroponic cultivation area, a portion of the filtered fresh water re-filtered from the freshwater fish farm is supplied to the hydroponic cultivation area, Desalination treatment method for desalination aquaculture facilities.

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