Sterilization and reuse system for plant culture solution using microbubbles, and method therefor

Abstract

The present invention relates to a circulation-type plant cultivation system for reusing nutrient solutions, such as in plant factories and smart farms, in which drainage generated during crop cultivation is recovered, sterilized using microbubbles, and reused.

Description

A system and method for sterilizing and reusing plant culture fluid using microbubbles

[0001] The present invention relates to a cultivation system that recovers wastewater generated during the crop cultivation process, sterilizes the wastewater using microbubbles, and reuses it in a circulating plant cultivation system that reuses nutrient solutions, such as plant factories and smart farms.

[0002]

[0003] A smart farm is an intelligent farm created by integrating information and communication technology (ICT) into agriculture. Smart farms utilize ICT (Information and Communications Technologies) to measure and analyze temperature, humidity, sunlight, carbon dioxide, and soil conditions within crop cultivation facilities. Based on these analysis results, they operate control devices to adjust crop conditions accordingly. Remote management is also possible via mobile devices such as smartphones. Smart farms can create high added value, such as productivity, efficiency, and quality improvements across the entire agricultural production, distribution, and consumption process. Since they refer to agricultural methods that utilize ICT, the concept can be applied to fields, greenhouses, and plant factories.

[0004] Typically, plant factories utilizing smart farm technology employ hydroponics, a method utilizing nutrient solutions. Hydroponics refers to a soil-free cultivation method that supplies a nutrient solution formulated with the appropriate proportions of essential elements for crop growth. This method can be implemented in areas where sufficient land is unavailable or soil contamination makes cultivation difficult. Unlike soil-based cultivation, hydroponics allows for precise and uniform environmental control, resulting in high productivity and high-quality crops. This has led to its widespread adoption. Currently, hydroponics is used not only for general crops but also for large-scale crops such as floriculture and fruit trees.

[0005] In this type of hydroponic cultivation, the nutrients supplied to the crops are not all absorbed by the plants, and drainage inevitably occurs.

[0006] The drainage liquid discharged after being used for crop growth has problems such as the ion concentration (electrical conductivity, EC) and pH value of the nutrient solution being in a concentration range that is not suitable for crop growth, or containing harmful elements such as germs and bacteria. Therefore, it is not desirable to use it as is, and much research is being conducted on sterilization and reprocessing of the drainage liquid to recycle it.

[0007]

[0008] The present invention was developed to improve the above-mentioned problems, and the purpose of the present invention is to provide a drainage sterilization and reuse system that stores drainage provided for reprocessing after being used for plant cultivation, and treats the drainage with microbubbles to sterilize harmful substances such as mold and bacteria in the drainage, and reuses the drainage.

[0009] Another object of the present invention is to provide a drainage sterilization and reuse system that can minimize the manpower and cost required for nutrient solution management through effective monitoring by providing the above-mentioned system, and can reduce irrigation and fertilizer costs and improve crop yield and quality through recycling of nutrient solution.

[0010] The purposes of the present invention are not limited to the purposes mentioned above, and other purposes and advantages of the present invention that are not mentioned can be understood through the following description.

[0011]

[0012] In order to solve the technical problem described above, the drainage sterilization and reuse system according to the present invention is a device for storing drainage provided for reprocessing after being used for cultivating plants from a cultivation facility, and treating the drainage with microbubbles to reduce harmful substances such as mold and bacteria in the drainage.

[0013] The drainage sterilization and reuse system according to the present invention is characterized by including a storage tank for storing drainage, a microbubble generation unit, a reaction tank, a filter, and a storage tank.

[0014] The storage tank stores the drainage provided from the cultivation facility, the microbubble generation unit generates bubbles with a diameter of 50 micrometers or less, and the reaction tank receives the drainage stored in the storage tank, and the drainage is sterilized by microbubbles generated in the microbubble generation unit.

[0015] The storage tank receives and stores the treated liquid from the reactor after it has been microbubble-treated. Since the treated liquid is a nutrient solution that has been sterilized by microbubbles, the number of mold and / or bacteria present in the drainage liquid can be significantly reduced.

[0016] A drainage sterilization and reuse system according to one embodiment of the present invention is characterized by further including a pump, a water level sensor, a valve, a control unit, and a drainage concentration measurement sensor.

[0017] A pump may be provided between any two of the storage tank, the microbubble generation unit, the reaction tank, and the storage tank to move the drainage before and after treatment. In one embodiment of the present invention, the pump may include a first pump provided between the storage tank and the reaction tank. In another embodiment of the present invention, the pump may include a second pump provided between the reaction tank and the storage tank. In another embodiment of the present invention, when the salt concentration of the drainage flowing in from the cultivation facility is high, a third pump may be included to discharge the drainage directly to the outside without passing through the storage tank.

[0018] The water level sensor can measure the water level of a component included in a drainage sterilization and reuse system, such as a storage tank, a reaction tank, and a storage tank, where liquid is stored, and can generate data from the measured value.

[0019] In one embodiment of the present invention, the water level sensor may be selected and used appropriately from among a float level switch method or a method using ultrasonic waves or a light source.

[0020] A valve is provided between any two of the storage tank, the microbubble generation unit, the reaction tank, and the storage tank, and can be opened or closed to control the movement of liquid. The valve may include a first valve for drainage liquid provided for reprocessing after being used in plant cultivation, which discharges the drainage liquid directly to the outside without reprocessing if the concentration of the drainage liquid exceeds a set value, and selectively sends the drainage liquid to the storage tank only if the concentration of the drainage liquid is within a set range.

[0021] Additionally, in one embodiment of the present invention, the valve may include a second valve provided between the storage tank and the reaction tank.

[0022] Additionally, in one embodiment of the present invention, the valve may include a third valve provided between the reaction tank and the storage tank.

[0023] In one embodiment of the present invention, the first valve is intended to discharge the drainage liquid flowing into the cultivation facility to the outside or transfer it to a storage tank, so a three-way valve may be adopted.

[0024] In one embodiment of the present invention, the concentration value of the drainage liquid flowing from the cultivation facility may refer to the salt concentration of the drainage liquid.

[0025] According to one embodiment of the present invention, in order to prevent salt accumulation in advance, the present invention is characterized by including a sensor for measuring the concentration of drainage liquid used for cultivation and collected for reprocessing.

[0026]

[0027] *The drainage concentration measurement sensor may be a sensor for measuring the concentration of inorganic elements contained in nutrient solutions such as drainage.

[0028] Additionally, the drainage concentration measurement sensor may include an EC sensor for measuring the electrical conductivity of drainage used in cultivation and collected for reprocessing.

[0029] According to another embodiment of the present invention, a selective ion electrode and / or an EC sensor for measuring the concentration of the drainage may be installed not only in the storage tank but also in the reaction tank and the storage tank and / or in the discharge path from the storage tank to measure the salt concentration of the drainage before / after treatment.

[0030] The control unit controls each component included in the drainage sterilization and reuse system. For example, the control unit can control a storage tank, a microbubble generator, a reactor, a storage tank, a pump, a water level sensor, a valve, and a drainage concentration measurement sensor.

[0031] The drainage sterilization and reuse system according to the present invention is characterized by including a filter, a mixing valve, a sterilizing water supply unit, a hydroxyl radical amplifier, and a cell counter.

[0032] A filter can be installed between the storage tank and the reaction tank and / or between the reaction tank and the storage tank to filter the liquid passing through the filter.

[0033] A drainage sterilization and reuse system according to one embodiment of the present invention is equipped with a mixing valve for mixing the treated liquid after sterilization and raw water.

[0034] In the above mixing valve, the amount and ion concentration of the treated solution after sterilization are taken into consideration, and then mixed with the raw water. Ultimately, the solution is transferred to a nutrient solution tank to adjust it to the preset amount and ion concentration required for plant cultivation. After the nutrient solution is replenished in the nutrient solution tank, it is sent to a cultivation facility and used for plant cultivation.

[0035] A drainage sterilization and reuse system according to one embodiment of the present invention is characterized by arranging a sterilizing water supply unit at the front end of a storage tank.

[0036] By supplying additional sterilizing water to the drainage liquid just before it is introduced into the storage tank after being sterilized by microbubbles, it is possible to kill germs and bacteria that were not killed by the sterilization by microbubbles.

[0037] The sterilizing water supplied from the sterilizing water supply unit is configured to supply hydrogen peroxide and fuwasan, which is hydrogen peroxide combined with nano-sized silver.

[0038] Whether or not additional sterilization of the treatment solution according to the supply of hydrogen peroxide, fuwasan, etc. according to the present invention can be determined based on the number of bacteria within the treatment solution measured using a cell counter described later.

[0039] A drainage sterilization and reuse system according to one embodiment of the present invention is characterized in that a hydroxyl radical amplifier is placed in a pipe connecting a microbubble generation unit and a reaction tank.

[0040] A drainage sterilization and reuse system according to one embodiment of the present invention includes a cell counter.

[0041] A cell counter according to the present invention is installed in a reaction tank and measures the number of cells present in the treated liquid after the sterilization process using microbubbles has been completed, thereby determining whether additional sterilization is necessary.

[0042]

[0043] As described above, the drainage sterilization and reuse system according to the present invention removes harmful substances such as mold and bacteria contained in drainage provided from a horticultural cultivation facility, thereby increasing cultivation efficiency and enabling the production of high-quality agricultural products. In addition, it can reduce the labor required for cultivation and the time required for management.

[0044]

[0045] FIG. 1 and FIG. 2 are drawings showing a microbubble-using drainage sterilization and reuse system according to one embodiment of the present invention.

[0046] Figure 3 is a flowchart showing the operation method of the drainage sterilization and reuse system of the present invention.

[0047] Figure 4 is a flowchart illustrating a step of supplying additional sterilizing water in Figure 3.

[0048]

[0049] To clarify the technical idea of ​​the present disclosure, embodiments of the present disclosure will be described in detail with reference to the attached drawings. In describing the present disclosure, if a detailed description of a related known function or component is determined to unnecessarily obscure the gist of the present disclosure, the detailed description will be omitted. Components having substantially the same functional configuration among the drawings are given the same reference numbers and symbols as possible even if they are shown in different drawings. For convenience of explanation, devices and methods are described together when necessary. Each operation of the present disclosure does not necessarily have to be performed in the described order and may be performed in parallel, selectively, or individually.

[0050] The terms used in the embodiments of this disclosure have been selected from widely used, current terms, taking into account the functions of the present disclosure. However, these terms may vary depending on the intentions of those skilled in the art, precedents, the emergence of new technologies, etc. Furthermore, in certain cases, the applicant may arbitrarily select terms, and in such cases, their meanings will be described in detail in the description of the relevant embodiments. Therefore, the terms used in this specification should not be defined simply as names of terms, but rather based on their meanings and the overall content of the present disclosure.

[0051] Throughout this disclosure, singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms such as "comprise" or "have" should be understood to indicate the presence of a feature, number, step, operation, component, part, or combination thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof. In other words, when it is said throughout this disclosure that a part "comprises" a certain component, unless specifically stated otherwise, this does not mean that other components may be included, but rather that other components may be excluded.

[0052] Expressions such as "at least one" modify the entire list of elements, not individual elements of the list. For example, "at least one of A, B, and C" and "at least one of A, B, or C" refer to only A, only B, only C, both A and B, both B and C, both A and C, all of A, B, and C, or any combination thereof.

[0053] In addition, terms such as “..unit”, “..module”, etc. described in the present disclosure mean a unit that processes at least one function or operation, which may be implemented as hardware or software, or a combination of hardware and software.

[0054] Throughout this disclosure, when a part is said to be "connected" to another part, this includes not only cases where the parts are "directly connected," but also cases where the parts are "electrically connected" with other elements intervening. Furthermore, when a part is said to "include" a component, this does not exclude other components, but rather includes other components, unless otherwise specifically stated.

[0055] The expression "configured to" as used throughout this disclosure can be used interchangeably with, for example, "suitable for," "having the capacity to," "designed to," "adapted to," "made to," or "capable of." The term "configured to" does not necessarily mean something is "specifically designed to" in hardware. Instead, in some contexts, the expression "a system configured to" can mean that the system is "capable of" in conjunction with other devices or components. For example, the phrase "a processor configured to perform A, B, and C" can mean a dedicated processor for performing the operations (e.g., an embedded processor), or a general-purpose processor (e.g., a CPU or application processor) that can perform the operations by executing one or more software programs stored in memory.

[0056]

[0057] Referring to FIGS. 1 to 3, the drainage sterilization and reuse system according to the present invention is a device for storing drainage provided for reprocessing after being used for plant cultivation from a cultivation facility (10), and treating the drainage with microbubbles to reduce harmful substances such as mold and bacteria in the drainage.

[0058] The drainage sterilization and reuse system according to the present invention includes a storage tank (100) for storing drainage, a reaction tank (200), a microbubble generation unit (300), a filter (30), and a storage tank (400).

[0059] The storage tank (100) stores the drainage provided from the cultivation facility (10).

[0060] The microbubble generating unit (300) generates bubbles having a diameter of 50 micrometers or less, and can generate various microbubbles using a rotating nozzle method, an airer method, a rotating stirring method, a gas and liquid mixing pump method, a pressurized dissolution method, an aeration method, a shear method, a shear swirl method, a depressurization method, or a cavitation method.

[0061] The reaction tank (200) receives the drainage liquid stored in the storage tank (100) and is a place where the drainage liquid is sterilized by microbubbles generated in the microbubble generation unit (300).

[0062] Microbubbles generated in the microbubble generating unit (300) are supplied to the reaction tank (200) through the lower part of the reaction tank (200), so that the drainage liquid of the reaction tank (200) contains microbubbles. The microbubbles slowly rise within the drainage liquid and destroy harmful substances such as bacteria and mold present within the drainage liquid, so that a sterilizing effect by the microbubbles occurs within the reaction tank (200).

[0063] Meanwhile, the nutrient solution that has been sterilized by microbubbles in the reaction tank (200) of the present invention is called a 'treated solution' and can be distinguished from the 'drainage solution' before treatment by microbubbles.

[0064] The effectiveness of sterilization treatment using microbubbles within the reaction tank (200) varies depending on the amount of drainage to be treated and the treatment time. As a result of repeated experiments using the device of the present invention, it was confirmed that the fungus of the genus Fusarium (Fusarium sp.) was killed after the reaction was continued for about 4 hours based on 1 ton of drainage. The reaction tank of the present invention can control the operation time of the reaction tank (200) by considering the concentration of the drainage measured by the sensor described below.

[0065] The storage tank (400) receives and stores the treated liquid from the reaction tank (200) that has undergone microbubble treatment. Since the treated liquid is a nutrient solution that has been sterilized by microbubbles, the number of molds and / or bacteria present in the drainage liquid may be significantly lower in the treated liquid.

[0066] FIG. 2 is a drawing showing a drainage sterilization and reuse system further including a pump (50), a valve (40), a water level sensor (60), a control unit (700), and a drainage concentration measurement sensor (21) according to one embodiment of the present invention.

[0067] Referring to FIG. 2, a drainage sterilization and reuse system according to one embodiment of the present invention further includes a pump (50), a water level sensor (60), a valve (40), a control unit (700), and a drainage concentration measurement sensor (21).

[0068] A pump (50) may be provided between any two of the storage tank (100), the microbubble generation unit (300), the reaction tank (200), and the storage tank (400) to move the drainage liquid or the treatment liquid. In one embodiment of the present invention, the pump (50) may include a first pump (51) provided between the storage tank (100) and the reaction tank (200). In addition, in one embodiment of the present invention, the pump (50) may include a second pump (52) provided between the reaction tank (200) and the storage tank (400). In addition, in one embodiment of the present invention, when the salt concentration of the drainage liquid flowing in from the cultivation facility (10) is high, a third pump (53) may be included to discharge the drainage liquid directly to the outside without passing through the storage tank (100).

[0069] The water level sensor (60, 61, 62, 63) can measure the water level of a place where liquid is stored, such as a storage tank (100), a reaction tank (62), and a storage tank (400), among the components included in the drainage sterilization and reuse system, and can generate data from the measured value.

[0070] In one embodiment of the present invention, the water level sensor may be selected and used appropriately from among a float level switch method or a method using ultrasonic waves or a light source.

[0071] Valves (42, 43) are provided between any two of the storage tank (100), the microbubble generation unit (300), the reaction tank (200), and the storage tank (400), and can be opened or closed to control the movement of liquid. The valve (41) may include a first valve (41) for directly discharging to the outside without reprocessing the drainage liquid provided for reprocessing after being used in the cultivation of plants when the concentration of the drainage liquid exceeds a set value, and selectively sending the drainage liquid to the storage tank (100) only when the concentration of the drainage liquid is within a set range.

[0072] Additionally, in one embodiment of the present invention, the valve may include a second valve provided between the storage tank and the reaction tank.

[0073] Additionally, in one embodiment of the present invention, the valve may include a third valve provided between the reaction tank and the storage tank.

[0074] In one embodiment of the present invention, the first valve (41) is intended to discharge the drainage liquid flowing in from the cultivation facility to the outside or transfer it to a storage tank, so a three-way valve may be adopted.

[0075] In one embodiment of the present invention, the concentration value of the drainage liquid flowing from the cultivation facility may refer to the salt concentration of the drainage liquid.

[0076] According to one embodiment of the present invention, in order to prevent salt accumulation in advance, the present invention is characterized by including a sensor for measuring the concentration of drainage liquid used for cultivation and collected for reprocessing.

[0077]

[0078] *The drainage concentration measurement sensor (21, 22) is a sensor for measuring the concentration of inorganic elements contained in nutrient solutions such as drainage.

[0079] Additionally, the drainage concentration measuring sensor (21, 22) may include an EC sensor for measuring the electrical conductivity of drainage used in cultivation and collected for reprocessing.

[0080] The combination of acids and bases in the soil (or nutrient solution in hydroponics) used by plants for growth is called a salt. It typically refers to a compound in which the acid's hydrogen ion is replaced by the base's cation through the neutralization of the acid and base. These salts accumulate in excess in nutrient solutions or soils when pesticides and chemical fertilizers are applied excessively over a long period of time. This process is called salt accumulation.

[0081] When salts accumulate, not only does it reduce the vitality of the roots of crops, but also the capillary phenomenon (reverse osmosis) caused by the water in the nutrient solution inhibits the absorption of water by the plant roots, causing physiological problems in nutrient absorption and metabolism, which ultimately prevents the plant from growing properly.

[0082] According to one embodiment of the present invention, a selective ion electrode may be installed to measure in real time the concentration of elemental ions in drainage fluid collected for cultivation and reprocessing in order to prevent salt accumulation in advance.

[0083] Specifically, it may include a selective ion electrode for measuring Ca2+, Mg2+, Na+, K+, Cl-, NO3-, HCO3-, CO3.

[0084] Meanwhile, the salt concentration is known to be proportional to the electrical conductivity (EC) of the nutrient solution. Electrical conductivity is a numerical measure of how well electric current flows within a substance, and is used as an indicator of the salt concentration within the nutrient solution.

[0085] Plant growth disorders are primarily caused by impaired root nutrient and water uptake due to increased osmotic pressure in the nutrient solution. This can be inferred by measuring electrical conductivity. Higher electrical conductivity indicates higher salt concentration and a greater likelihood of causing plant damage.

[0086] Therefore, according to one embodiment of the present invention, an EC sensor may be installed to measure the electrical conductivity of drainage liquid collected for cultivation and reprocessing in order to prevent salt accumulation in advance.

[0087] According to another embodiment of the present invention, a selective ion electrode and / or an EC sensor for measuring the concentration of the drainage may be installed not only in the storage tank but also in the reaction tank and the storage tank and / or in the discharge path from the storage tank to measure the salt concentration of the drainage before / after treatment.

[0088] Meanwhile, although it is possible to measure the concentration of the above-mentioned inorganic elements used in the cultivation of crops with a fairly accurate value when the ion concentration is obtained by ion exchange chromatography, it is impossible to measure in real time due to the preprocessing of the detection target solution sample and the injection of reagents required for the analysis of the sample, and since such a device is expensive and cannot be equipped to individual farms, the present invention provides a correction table for correcting the difference in concentration values ​​by comparing the ion concentration measured by ion exchange chromatography according to the pH, electrical conductivity and temperature values ​​of the medium, which is the growth environment, with the ion concentration value and electrical conductivity measured using an ion-selective electrode according to the culture cycle in advance, and by utilizing this correction table, it is possible to measure the salt concentration of the drained liquid in real time more accurately and quickly.

[0089] The control unit (700) controls each component included in the drainage sterilization and reuse system. For example, the control unit (700) can control a storage tank (100), a microbubble generator (300), a reaction tank (200), a storage tank (400), pumps (51, 52, 53), water level sensors (61, 62, 63), valves (41, 42, 43, 44), and a drainage concentration measurement sensor (21, 22).

[0090] A drainage sterilization and reuse system according to an embodiment of the present invention includes a pump (51, 52, 53), a water level sensor (61, 62, 63), a drainage concentration measuring sensor (21, 22), a valve (41, 42, 43, 44), and a control unit (700), and can be automated under the control of the control unit (700), thereby reducing the time required for system management. In addition, the pump (51, 52, 53) and the valve (41, 42, 43, 44) are controlled based on data provided from sensors including the water level sensor (61, 62, 63), the drainage concentration measuring sensor (21, 22), etc., so that the system can be controlled to operate in a desirable order, and appropriate responses can be taken even if a problem occurs during system operation.

[0091] The drainage sterilization and reuse system according to the present invention includes a filter (31, 32), a mixing valve (44), a sterilizing water supply unit (500), a hydroxyl radical amplifier (800), and a cell counter (71) (Fig. 2).

[0092] The filter (31, 32) is installed between the storage tank (100) and the reaction tank (200) and / or between the reaction tank (200) and the storage tank (400) to filter the liquid passing through the filter (31, 32).

[0093] A drainage sterilization and reuse system according to one embodiment of the present invention is equipped with a mixing valve (44) for mixing the treated liquid after sterilization and the raw water.

[0094] In the above mixing valve (44), the amount of the treated solution that has completed the sterilization process and its ion concentration (salt concentration) are taken into consideration, and then mixed with the raw water. Then, in order to adjust it to the preset amount and ion concentration required for plant cultivation, it is transferred to the nutrient solution device (600), and after the nutrient solution is replenished in the nutrient solution device (600), it is sent to the cultivation facility (10) and used for plant cultivation.

[0095] A drainage sterilization and reuse system according to one embodiment of the present invention is characterized by arranging a sterilizing water supply unit (500) at the front end of a storage tank (400).

[0096] By additionally supplying sterilizing water to the treatment liquid just before it is introduced into the storage tank (400) after sterilization by microbubbles, germs and bacteria that were not killed by the sterilization by microbubbles can be killed.

[0097] The sterilizing water supplied from the sterilizing water supply unit (500) is configured to supply hydrogen peroxide and fuwasan, which is hydrogen peroxide combined with nano-sized silver.

[0098] Whether or not additional sterilization of the treatment solution according to the supply of hydrogen peroxide, fuwasan, etc. according to the present invention can be determined based on the number of bacteria within the treatment solution measured by a cell counter (71) described later.

[0099] A drainage sterilization and reuse system according to one embodiment of the present invention is characterized in that a hydroxyl radical amplifier (800) is placed in a pipe connecting a microbubble generation unit (300) and a reaction tank (200).

[0100] The hydroxyl radical amplifier (800) adopted in the present invention generates hydroxyl radicals with a strong sterilizing function in the process in which water molecule ions are decomposed into hydrogen ions and oxygen ions.

[0101] A drainage sterilization and reuse system according to one embodiment of the present invention includes a cell counter (71).

[0102] A cell counter (71) according to the present invention is installed in a reaction tank (200) and measures the number of cells present in the treated liquid after the sterilization process using microbubbles has been completed, thereby determining whether additional sterilization is necessary.

[0103] The cell counter (71) according to the present invention is characterized in that it is a cell counter that utilizes an optical method or an electrical impedance measurement principle.

[0104] In addition, the cell counter (71) according to the present invention may be installed inside the reaction tank (200), but its installation location is not particularly limited as long as it is capable of counting cells present in the reaction tank (200). For example, it may be installed during the process of the treatment solution moving from the reaction tank (200) to the storage tank (400) to count the number of cells.

[0105] Figure 3 is a flowchart showing the operation method of a drainage sterilization and reuse system according to one embodiment of the present invention.

[0106] Referring to FIG. 3, the drainage sterilization and reuse system according to one embodiment of the present invention first measures the salt concentration to determine whether the drainage used for cultivation from a cultivation facility and then reprocessed (sterilized) is suitable for reprocessing (S100), and if the salt concentration of the drainage is higher than a set value, the drainage is completely discharged to the outside through a third pump, and if the salt concentration of the drainage is lower than the set value, the drainage is provided to a storage tank for reprocessing (S200).

[0107] The drainage is provided to a storage tank, and when the drainage reaches a certain level in the storage tank, it is transferred to a reaction tank for microbubble treatment (S300).

[0108] Microbubbles generated in the microbubble generation unit are supplied to the drainage transferred to the reactor through step S300, and sterilization treatment using microbubbles is performed (S400).

[0109] The drainage liquid sterilized through the S400 step is called the treated liquid, and this treated liquid is supplied to a storage tank for reuse in the cultivation facility (S500).

[0110] Finally, the treatment solution supplied to the storage tank is mixed with the raw water by considering the amount of the treatment solution that has completed the sterilization process at the mixing valve and its ion concentration (salt concentration) (S600), and then transferred to the nutrient solution tank to adjust it to the preset amount and ion concentration required for plant cultivation. After the nutrient solution is replenished in the nutrient solution tank, it is sent to the cultivation facility and used for plant cultivation.

[0111] Figure 4 is a flow chart for counting the number of bacteria in a treatment solution sterilized through step S400 and explaining an additional sterilization process of the treatment solution based on the results.

[0112] In step S400, the number of bacteria in the sterilized treatment liquid is counted (S410), and if the number of bacteria exceeds the preset number, the sterilizing water supply device placed in the pipe between the reaction tank and the storage tank is operated (S420), so that the sterilizing water is mixed with the treatment liquid supplied from the reaction tank to the storage tank to perform additional sterilization. In addition, if the number of bacteria is less than the preset number, step S420 can be omitted.

[0113] The above sterilizing solution may use hydrogen peroxide and / or fuwasan.

Claims

1. A storage tank that stores drainage liquid provided from cultivation facilities for reprocessing of nutrient solution used in cultivation; A microbubble generating unit that generates microbubbles for primary sterilization of the above-mentioned drainage fluid; A reaction tank that receives the drainage liquid stored in the storage tank and performs a sterilization operation of the drainage liquid by microbubbles generated in the microbubble generation unit; In a drainage sterilization and reuse system including a storage tank for receiving and storing the treated liquid that has undergone microbubble treatment in the above reaction tank, A pump provided between any two of the storage tank, the microbubble generation unit, the reaction tank and the storage tank to move the drainage or treatment liquid; and A water level sensor for measuring the liquid level in at least one of the above storage tank, reaction tank, and storage tank; and A valve provided between any two of the above storage tank, microbubble generation unit, reaction tank and storage tank, and opened or closed to control the movement of liquid; and A drainage sterilization and reuse system characterized by having a drainage concentration measuring sensor that measures the concentration of drainage used for cultivation and for reprocessing.

2. In paragraph 1, The above drainage concentration measuring sensor is placed at the front end of the storage tank, A drainage sterilization and reuse system characterized in that, when the measured value of the drainage concentration measuring sensor exceeds a set value, the drainage is discharged directly to the outside without reprocessing.

3. In paragraph 2, A drainage sterilization and reuse system characterized in that the above drainage concentration measuring sensor is an ion electrode or an electrical conductivity sensor.

4. In paragraph 1, A drainage sterilization and reuse system characterized in that a sterilizing water supply unit is provided to additionally supply sterilizing water to drainage immediately before it is introduced into the storage tank after being sterilized by microbubbles.

5. In paragraph 1 A drainage sterilization and reuse system characterized in that a hydroxyl radical amplifier is placed in a pipe connecting a microbubble generation unit and the above-mentioned reaction tank.

6. In paragraph 1 A drainage sterilization and reuse system characterized in that a mixing valve for mixing the sterilized treatment liquid and raw water is placed at the rear end of the above storage tank.

7. Step (S100) of measuring the salt concentration to determine whether the drainage used for cultivation from the cultivation facility is suitable for reprocessing; A step (S200) of providing the drainage to a storage tank for reprocessing when the salt concentration of the drainage is less than a set value; A step (S300) in which drainage is provided to the above storage tank, and when the drainage is collected in the storage tank at a certain level, it is transferred to a reaction tank for microbubble treatment; A step (S400) of supplying microbubbles generated in a microbubble generation unit to the drainage liquid transferred to the reaction tank through the above step S300 to perform sterilization treatment using microbubbles, and a step (S500) of supplying the treated liquid sterilized through the above step S400 to a storage tank; A method for sterilizing and reusing drainage water, characterized by including a step (S600) of mixing the treatment solution supplied to the storage tank with raw water in a mixing valve.

8. In paragraph 7, A method for sterilizing and reusing drainage, characterized in that when the salt concentration of the drainage measured at step S100 exceeds a set value, the drainage is discharged to the outside without being reprocessed.

9. In paragraph 7, A method for sterilizing and reusing drainage fluid, characterized in that it further includes a sterilizing water supply step (S420) for additionally supplying sterilizing water to the treatment solution between the S400 and S500 steps.

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