JP2011000070A - Hydroponics equipment and hydroponics method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide hydroponics equipment and a hydroponics method each directly generating ozone in nutritious liquid to sterilize nutritious liquid.SOLUTION: This hydroponics equipment includes a cultivation bed 1 for arranging plants, a nutritious liquid tank 2 storing nutritious liquid to be supplied to the cultivation bed 1, an ozone sterilizing device 3 generating ozone, and a nutritious liquid sterilizing channel 12 sending nutritious liquid from the nutritious liquid tank 2 to the ozone sterilizing device 3 and returning the nutritious liquid from the ozone sterilizing device 3 to the nutritious liquid tank 2. It is possible to sterilize nutritious liquid by directly generating ozone in nutritious liquid in the ozone sterilizing device 3.

Description

  The present invention relates to a hydroponic equipment and a hydroponic method. More particularly, the present invention relates to a hydroponic cultivation facility and a hydroponic cultivation method for controlling diseases of plants to be cultivated by using ozone for sterilization and sterilization of the nutrient solution itself and the hydroponic cultivation facility.

  Hydroponics is the use of soil by forming a root system in a solid medium or water, giving nutrients necessary for growth through a nutrient solution (culture solution) in which liquid fertilizer and diluted water are mixed in a predetermined ratio. It means a cultivation method for cultivating plants such as crops. Major diseases of plants that occur in hydroponics include bacterial wilt, wilt, and root rot.Many of the pest infestation routes in these diseases are transmitted by seeds, transmitted from the air, It is said to be transmitted by water and nutrient solution, and transmitted from seedling materials, hoses and water pipes. In particular, if pathogenic bacteria are mixed in the nutrient solution in the cultivation bed or nutrient solution tank, it may spread to catastrophic damage, which is one of the factors that hinder the stable production and area expansion of nutrient solution cultivation. ing. Furthermore, since there are currently no registered pesticides, sufficient disinfection has been considered impossible. In addition, as a countermeasure for disease control, a method using ultraviolet irradiation, a method using ultrasonic waves, a method using heat sterilization, and the like have been studied, but none of them has been put to practical use. Under such circumstances, in recent years, methods of disinfection and sterilization using ozone have been studied in place of ultraviolet irradiation methods, ultrasonic methods, heat sterilization methods, and the like. For example, the following methods are mentioned.

  Conventionally, a method of disinfecting a culture solution for hydroponics in which negative ions and ozone-containing gas are injected and mixed in the culture solution to activate the culture solution is known (see, for example, Patent Document 1). In the disinfection method described in Patent Document 1, negative ions and ozone-containing gas are injected and mixed into the culture solution in the culture solution adjustment tank to activate the disinfection of the culture solution, and oxygen enrichment of the culture solution for hydroponics. In order to measure, a part of the culture solution is aerated in the culture solution adjustment tank.

  Moreover, the sterilizer of the nutrient solution cultivation apparatus which circulates a nutrient solution between a nutrient solution tank and a cultivation bed is also known (for example, refer patent document 2). The sterilization apparatus described in Patent Document 2 is a tank that blows ozone gas into a nutrient solution by an injector, and a tank that accelerates the decomposition of undecomposed ozone gas that is blown and dissolved into the nutrient solution that has overflowed from the tank. And a decomposition treatment part (catalyst decomposition and catalyst heater) of undissolved ozone gas is provided on the upper part of the sterilization tank.

  Furthermore, the nutrient solution adjusted using the desalted raw water is supplied to the cultivation bed, and the excess nutrient solution drainage from the cultivation bed is sterilized by a sterilization device composed of a hollow fiber membrane to circulate and use the nutrient solution. A hydroponics method is also known (see, for example, Patent Document 3). In the nutrient solution cultivation method described in Patent Document 3, at night when plant growth is inactive, a solution containing ozone is flowed into a pipe or tank through which the nutrient solution flows to remove the biofilm attached to them. The sterilization is done. In addition, the liquid containing ozone is produced | generated by injecting and mixing ozone gas in the raw water desalted with the mixing pump.

JP 03-236728 A JP 05-336856 A JP 2001-299116 A

  However, in the method for disinfecting a culture solution for hydroponics described in Patent Document 1, ozone gas that has not been dissolved in the culture solution is provided with a cultivation bed via an exhaust gas pipe above the culture solution adjustment tank. Since it is discharged into the air in the cultivation facility, problems such as plant chlorosis (whitening) occur. Moreover, when ozone gas accumulates not only in plants but also in the work environment, there may be cases where effects on workers are recognized. Furthermore, since ozone gas is directly blown and mixed into the culture solution in the culture solution adjustment tank, high-concentration ozone gas comes into contact with the culture solution, and trace components in the culture solution produce oxides. As a result, oxides precipitate. It may be deposited as a product and the composition of the culture solution may change greatly, causing nutritional damage to the plant. In addition, although it is easy to oxidize in order of manganese> iron> calcium in the component of a culture solution, since high concentration ozone gas also oxidizes even calcium which is comparatively hard to oxidize, it is easy to become a nutritional disorder.

  Moreover, also in the sterilization apparatus of the nutrient solution cultivation apparatus described in Patent Document 2, as in the disinfection method described in Patent Document 1, since the ozone gas is directly blown into the nutrient solution and mixed, the nutrient solution composition greatly changes. May cause nutritional problems in plants. Further, since this sterilizer removes undissolved ozone gas from the nutrient solution by injecting air into the nutrient solution, an ozone gas decomposing device is required. In addition, because ozone gas is actively excluded from the nutrient solution, the ozone gas decomposing device is a lifeline for avoiding the danger and ensuring safety of this technology, and it is difficult to manage by ordinary farmers. Furthermore, since no ozone remains in the nutrient solution due to air injection into the nutrient solution, even if the nutrient solution can be sterilized, it is difficult to sterilize the pathogenic bacteria generated in the cultivation bed, and in particular it adheres to the root system of plants. It is difficult to sterilize the pathogenic bacteria and the disease control effect is insufficient.

  Moreover, although the nutrient solution cultivation method described in patent document 3 is not what disinfects nutrient solution directly with ozone gas like the technique described in patent document 1, 2, ozone gas with low solubility is mixed with raw water with a mixing pump. Since it is injected into (RO water), a liquid containing undissolved ozone gas is supplied to the cultivation bed. Therefore, when the liquid containing ozone is sprinkled from the piping in the cultivation bed, undissolved ozone gas is discharged into the air in the cultivation facility, and the plant is damaged by the ozone gas. In addition, it is supposed that a fatal obstacle is given to a plant by ozone gas concentration of 0.3 ppm. In addition, this technology is a complex configuration with many equipment configurations, such as RO membrane equipment for desalination to prevent salt concentration in nutrient solution and hollow fiber membrane equipment for sterilization. Realistic equipment. Furthermore, since the embodiment described in Patent Document 3 is intended for a method using a solid medium, even if the sterilization inside the pipe or tank is possible, it is difficult to sterilize pathogenic bacteria that survive in the solid medium. In order to make it possible to sterilize pathogenic bacteria living in the solid medium, it is necessary to supply a relatively large amount of ozone-containing water, resulting in an increase in damage to plants caused by ozone gas. Moreover, in the nourishing culture using a solid culture medium, the oxide accumulates in the piping that supplies the nourishing solution, which causes the piping or nozzle to be blocked.

  The present invention has been made in view of the above circumstances, and does not require a step of dissolving ozone in water after generating conventional ozone gas, and generates ozone directly in the nutrient solution. It is providing the hydroponic cultivation equipment and hydroponic cultivation method which can be sterilized.

  The present invention relates to a hydroponic equipment and a hydroponic method. And the hydroponic cultivation equipment and the hydroponic cultivation method concerning the present invention have the following some features in order to solve the above-mentioned subject. That is, the hydroponic cultivation equipment and the hydroponic cultivation method of the present invention have the following features alone or in combination as appropriate.

  The hydroponic cultivation facility according to the first invention for achieving the above object includes a cultivation bed in which plants are arranged, a nutrient solution tank for storing a nutrient solution to be supplied to the cultivation bed, an ozone sterilizer, A nutrient solution sterilization path for sending the nutrient solution from the nutrient solution tank to the ozone sterilizer and returning the nutrient solution from the ozone sterilizer to the nutrient solution tank.

  According to this structure, ozone can be directly generated in the nutrient solution. Since the nutrient solution can be instantly sterilized by the ozone, a nutrient solution sterilized with an arbitrary residual dissolved ozone concentration (hereinafter referred to as an electrolytic treatment nutrient solution for convenience) is generated. This electrolytic treatment nutrient solution has an extremely small amount of ozone gas that is volatilized as compared with conventional ozone water generated by blowing ozone gas into water and dissolving it (hereinafter referred to as gas-dissolved ozone water as appropriate). For this reason, plant damage due to ozone gas such as chlorosis (whitening) of plants can be prevented.

  Moreover, in the said nutrient solution cultivation equipment, it is comprised so that an electrolytic treatment nutrient solution may return to a nutrient solution tank. For this reason, unlike the prior art disclosed in Patent Documents 1 and 2, since ozone gas is not generated, excess ozone gas does not contact the nutrient solution, and as a result, the nutrient solution in the nutrient solution sterilization with ozone. The composition does not change significantly.

  Moreover, ozone can be directly produced | generated using the ozone sterilizer in the nutrient solution supplied to a cultivation bed. And since ozone is produced | generated directly from a nutrient solution, sterilization of the pathogenic microbe derived from a nutrient solution can be achieved reliably. That is, since ozone necessary for sterilization can be obtained instantly with a certain reproducibility, a certain sterilization effect can be obtained, and the occurrence of a disease using a nutrient solution as a contamination source can be controlled.

  Moreover, since the electrolytic treatment nutrient solution is supplied from the nutrient solution tank to the cultivation bed, it is possible to suppress an increase in the number of bacteria attached to the plants arranged on the cultivation bed, and to prevent the occurrence of disease.

  In this way, the process of “dissolving ozone in water after generating ozone gas” and the process of “mixing the generated ozone water with the culture solution” directly in the gas-dissolved ozone water as in the past are not required. Therefore, the nutrient solution can be sterilized. In addition, after the nutrient solution in the nutrient solution tank is sterilized by ozone via the ozone sterilizer, the entire nutrient solution used in the entire nutrient solution cultivation facility is sterilized while repeating the process of returning to the nutrient solution tank again. Can be processed.

  The hydroponic cultivation facility according to a second aspect of the present invention is the first aspect, wherein the ozone sterilizer is provided on the anode side channel provided on one of the electrolyte membrane and the electrolyte membrane and on the other side of the electrolyte membrane. A cathode side flow path, generating ozone in the anode side flow path, the nutrient solution sterilization path is configured to send the nutrient solution from the nutrient solution tank to the anode side flow path of the ozone sterilizer, The nutrient solution is returned to the nutrient solution tank from the anode-side flow path.

  According to this structure, the nutrient solution supplied to the cultivation bed can be electrolyzed in the anode-side flow path of the ozone sterilizer to directly generate ozone in the nutrient solution. And since ozone is produced | generated directly from a nutrient solution, sterilization of the pathogenic microbe derived from a nutrient solution can be achieved reliably. That is, the ozone necessary for sterilization can be obtained instantly with a certain reproducibility by the electrolytic reaction in the anode-side flow path of the ozone sterilizer, so that a certain sterilization effect can be obtained and the nutrient solution is used as a contamination source Can control the occurrence of diseases.

  Moreover, since an electric current flows in a nutrient solution by electrolysis in the anode side flow path of an ozone sterilizer, the sterilization effect to the pathogenic microbe etc. in a nutrient solution can be improved with an electric shock.

  Also, when sulfate, nitrate, phosphate, etc. are contained in the nutrient solution, the sulfate, nitrate, phosphate, etc. contained in the nutrient solution are electrolyzed in the anode-side flow path and are nourished. Even if the pH value in the solution is lowered (acidification) and the nutrient solution is stored in the nutrient solution tank, the increase in the number of bacteria can be suppressed and the bactericidal effect can be maintained.

  The nutrient solution cultivating facility according to a third invention is the nutrient solution sterilization path according to the second invention, wherein the nutrient solution sterilization path is fed from the nutrient solution tank to the cultivation bed via the anode-side flow path of the ozone sterilizer. A liquid is supplied, and the nutrient solution is returned from the cultivation bed to the nutrient solution tank.

  According to this structure, since the ozone sterilizer is arrange | positioned before the cultivation bed, it can sterilize before the nutrient solution is supplied to the plant arranged on the cultivation bed. Moreover, since the ozone sterilization apparatus and the cultivation bed are arrange | positioned on the same nutrient solution sterilization path | route, the structure of a nutrient solution cultivation equipment can be made simple.

  A hydroponic cultivation facility according to a fourth invention is characterized in that, in any one of the first to third inventions, an alkali supply means for adding an alkaline substance to the nutrient solution tank is provided.

  When sulfate, nitrate, phosphate, etc. are contained in the nutrient solution, the sulfate, nitrate, phosphate, etc. contained in the nutrient solution are electrolyzed in the anode side flow path, The pH value of becomes lower and acidifies. A certain degree of acidification can suppress the increase in the number of bacteria and is effective in maintaining the bactericidal effect. However, if the pH value in the nutrient solution is too low (extreme acidification), the plant is cultivated with acidity. May cause damage. Therefore, by providing an alkali supply means for adding an alkaline substance to the nutrient solution tank according to the above configuration, an alkaline substance is added to the acidified nutrient solution to neutralize the nutrient solution, thereby avoiding damage caused by plant acids. can do. In addition, potassium hydroxide, sodium hydroxide, etc. are raised to the alkaline substance used here. Even in this case, since the nutrient solution is once acidic, a bactericidal effect due to a decrease in pH value can be expected.

  The nutrient solution cultivation facility according to a fifth aspect of the present invention is the nutrient solution sterilization path according to the second aspect, wherein the nutrient solution sterilization path is routed from the nutrient solution tank in the order of the anode side channel and the cathode side channel of the ozone sterilizer. Then, the nutrient solution is supplied to the cultivation bed, and the nutrient solution is returned from the cultivation bed to the nutrient solution tank.

  According to this configuration, the nutrient solution can be supplied to the cultivation bed in the order of the anode side channel and the cathode side channel. Then, the nutrient solution that has been electrolyzed in the anode-side channel and has a lowered pH value (acidified) can be neutralized by electrolyzing in the cathode-side channel. For this reason, without adding an alkaline substance etc., the pH value in a nutrient solution can be neutralized and the damage by the acid of a plant can be avoided.

  A hydroponic cultivation facility according to a sixth invention is characterized in that, in any one of the second to fifth inventions, an acid cleaning means for cleaning the cathode-side channel with an acid is provided.

  The electrolysis voltage may increase due to impurities attached to the cathode electrode provided in the cathode-side flow path due to the long-time electrolytic treatment in the ozone sterilizer, and the continuous operation of the hydroponic cultivation equipment may not be possible for a long time. . Therefore, by providing acid cleaning means and acid cleaning the cathode side channel, the impurities attached to the cathode electrode are dissolved and removed, and the electrolytic voltage is lowered to enable continuous operation of the hydroponic cultivation equipment for a long time. Can do.

  The nutrient solution cultivation method according to the seventh aspect of the invention is to send the nutrient solution from a nutrient solution tank that stores the nutrient solution supplied to the cultivation bed to the ozone sterilizer, and in the ozone sterilizer, ozone is contained in the nutrient solution by electrolysis. And the nutrient solution is returned from the ozone sterilizer to the nutrient solution tank.

  According to this method, ozone can be directly generated using an ozone sterilizer in the nutrient solution supplied to the cultivation bed. And since ozone is produced | generated directly from a nutrient solution, sterilization of the pathogenic microbe derived from a nutrient solution can be achieved reliably. That is, since ozone necessary for sterilization can be obtained instantly with a certain reproducibility, a certain sterilization effect can be obtained, and the occurrence of a disease using a nutrient solution as a contamination source can be controlled.

  Moreover, since the electrolytic treatment nutrient solution is supplied from the nutrient solution tank to the cultivation bed, it is possible to suppress an increase in the number of bacteria attached to the plants arranged on the cultivation bed, and to prevent the occurrence of disease.

  In this way, the process of “dissolving ozone in water after generating ozone gas” and the process of “mixing the generated ozone water with the culture solution” directly in the gas-dissolved ozone water as in the past are not required. Therefore, the nutrient solution can be sterilized. In addition, after the nutrient solution in the nutrient solution tank is sterilized by ozone via the ozone sterilizer, the entire nutrient solution used in the entire nutrient solution cultivation facility is sterilized while repeating the process of returning to the nutrient solution tank again. Can be processed.

  A hydroponic cultivation method according to an eighth invention is the seventh invention, wherein the ozone sterilizer is provided on the other of the electrolyte membrane and the anode-side flow path provided on one of the electrolyte membrane and the electrolyte membrane. A cathode-side channel, and the nutrient solution is sent from the nutrient solution tank storing the nutrient solution supplied to the cultivation bed to the anode-side channel of the ozone sterilizer, and the anode-side channel is electrolyzed by electrolysis Ozone is generated in the nutrient solution, and the nutrient solution is returned from the anode-side flow path to the nutrient solution tank.

  According to this method, the nutrient solution supplied to the cultivation bed can be electrolyzed in the anode-side flow path of the ozone sterilizer to directly generate ozone in the nutrient solution. And since ozone is produced | generated directly from a nutrient solution, sterilization of the pathogenic microbe derived from a nutrient solution can be achieved reliably. That is, the ozone necessary for sterilization can be obtained instantly with a certain reproducibility by the electrolytic reaction in the anode-side flow path of the ozone sterilizer, so that a certain sterilization effect can be obtained and the nutrient solution is used as a contamination source Can control the occurrence of diseases. In addition, it does not require the process of “dissolving ozone in water after generating ozone gas” or the process of “mixing the generated ozone water with the culture solution” directly with gas-dissolved ozone water, as in the past. Sterilization of nutrient solution becomes possible. The nutrient solution used in the entire nutrient solution cultivating equipment while repeating the process in which the nutrient solution in the nutrient solution tank is electrolytically sterilized via the anode-side flow path of the ozone sterilizer and then returned to the nutrient solution tank again. The whole amount can be sterilized.

  The nutrient solution cultivation method according to a ninth aspect of the present invention is the nutrient solution cultivation method according to the eighth aspect of the present invention, wherein ozone is generated in the nutrient solution by electrolysis and then the nutrient solution is fed from the anode channel to the cultivation bed. A liquid is supplied, and the nutrient solution is returned from the cultivation bed to the nutrient solution tank.

  According to this method, the sterilization treatment can be performed before the nutrient solution is supplied to the plant arranged in the cultivation bed.

  In the nutrient solution cultivation method according to the tenth aspect of the invention, in the anode-side channel in the eighth invention, after ozone is generated in the nutrient solution by electrolysis, the ozone-sterilizing apparatus is configured to perform the ozone sterilization device from the anode-side channel. The nutrient solution is sent to the cathode-side channel, the nutrient solution is supplied from the cathode-side channel to the cultivation bed, and the nutrient solution is returned from the cultivation bed to the nutrient solution tank. .

  According to this method, the nutrient solution can be supplied to the cultivation bed in the order of the anode side channel and the cathode side channel. Then, the nutrient solution that has been electrolyzed in the anode-side channel and has a lowered pH value (acidified) can be neutralized by electrolyzing in the cathode-side channel. For this reason, without using an alkaline substance etc., the pH value in a nutrient solution can be neutralized and the damage by the acid of a plant can be avoided.

  Directly nourish without the need to “dissolve ozone in water after generating ozone gas” or “mix the generated ozone water with the culture solution” with conventional gas-dissolved ozone water Can be sterilized. In addition, after the nutrient solution in the nutrient solution tank is sterilized by ozone via the ozone sterilizer, the entire nutrient solution used in the entire nutrient solution cultivation facility is sterilized while repeating the process of returning to the nutrient solution tank again. Can be processed.

It is a block diagram which shows the hydroponic cultivation equipment which concerns on 1st Embodiment of this invention. It is a graph which shows the number of microbes in the nutrient solution before and behind the electrolysis process in an ozone sterilizer. It is the graph which showed the change of the number of microbes with time passage in a nutrient solution tank, and the change of pH value of a nutrient solution. It is a block diagram which shows the hydroponic cultivation equipment which concerns on 2nd Embodiment of this invention. It is a block diagram which shows the hydroponic cultivation equipment which concerns on 3rd Embodiment of this invention. It is a block diagram which shows the hydroponic cultivation equipment which concerns on 4th Embodiment of this invention. It is a block diagram which shows the hydroponic cultivation equipment which concerns on 5th Embodiment of this invention. It is a block diagram which shows the hydroponic cultivation equipment which concerns on 6th Embodiment of this invention. It is a graph showing the change of the pH value of a nutrient solution and the electrolysis voltage with time progress of the electrolysis process in an ozone sterilizer. It is a block diagram which shows the hydroponic cultivation equipment which concerns on 7th Embodiment of this invention.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. The hydroponic cultivation equipment and the hydroponic cultivation method of the present invention can be applied to any type of hydroponic culture such as solid medium cultivation, submerged hydroponic culture, and NFT type hydroponic cultivation. A cultivation facility and a hydroponic cultivation method.

(First embodiment)
FIG. 1 is a block diagram showing a hydroponic cultivation facility 100 according to the first embodiment of the present invention.

  As shown in FIG. 1, a nutrient solution cultivation facility 100 according to the present embodiment includes a cultivation bed 1 in which plants are arranged, a nutrient solution tank 2 for storing a nutrient solution supplied to the cultivation bed 1, and a predetermined nutrient solution. And an additional fertilizer tank for storing liquid fertilizer to be supplied to the nutrient solution tank 2 for adjusting the concentration of the nutrient solution in the nutrient solution tank 2 (so-called EC adjustment). 4 and a cleaning agent tank 5 (acid cleaning means) for storing citric acid for acid cleaning the cathode-side flow path 35 of the ozone sterilizer 3 to be described later. And these each apparatus is mutually connected by paths, such as piping. The nutrient solution supply / discharge paths 10 and 11 are paths that connect the nutrient solution tank 2 and the cultivation bed 1, respectively. The nutrient solution sterilization path 12 is a path that connects the nutrient solution tank 2 and the ozone sterilizer 3. And the nutrient solution sterilization path | route 12 is comprised so that the anode side flow path 34 of the ozone sterilizer 3 mentioned later may pass. The path 13 is a path that connects the top fertilizer tank 4 and the nutrient solution tank 2. Further, the cleaning path 14 is a path that connects the cleaning agent tank 5 and the ozone sterilizer 3. And the washing | cleaning path | route 14 (acid cleaning means) is comprised so that the cathode side flow path 35 of the ozone sterilizer 3 mentioned later may be passed.

  A supply pump P1 and a check valve 40 are attached to the nutrient solution sterilization path 12 from the upstream side. The check valve 40 is a valve for preventing the backflow of the nutrient solution in the nutrient solution sterilization path 12. Further, a nutrient solution supply pump P2 is connected to upstream ends of the nutrient solution supply / discharge paths 10 and 11, and the nutrient solution supply pump P2 is installed at the bottom of the nutrient solution tank 2. A supply pump P3 and a check valve 41 are attached to the cleaning path 14 from the upstream side. The check valve 41 is a valve for preventing the backflow of citric acid in the cleaning path 14.

  Next, the ozone sterilizer 3 shown in FIG. 1 will be described. As shown in FIG. 1, the ozone sterilizer 3 includes a solid electrolyte membrane 31 (electrolyte membrane), an anode-side channel 34 provided on one side thereof, a cathode-side channel 35 provided on the other side, an anode The cathode 32 is provided with an electrode 32 and a cathode electrode 33, the anode electrode 32 to which a DC voltage is applied is disposed so as to be in contact with the solid electrolyte membrane 31 in the anode-side flow path 34, and the DC voltage is applied. The electrode 33 is disposed in contact with the solid electrolyte membrane 31 in the cathode side flow path 35. The nutrient solution supplied to the anode-side channel 34 is electrolyzed to generate ozone in the anode-side channel 34. Note that citric acid in the cleaning agent tank 5 is supplied to the cathode-side channel 35 via the cleaning path 14, and the cathode electrode 33 disposed in the cathode-side channel 35 is acid cleaned.

  That is, in the ozone sterilization apparatus 3, in the gas-dissolved ozone water generation, a process of “after generating the ozone gas, blowing the ozone gas into the water to dissolve it” or “mixing the generated ozone water with the culture solution” The electrolytic treatment nutrient solution can be generated based on the electrolysis of the water contained in the nutrient solution without the need for the process of “. In the anode side channel 34, oxygen is also generated by electrolysis of the nutrient solution, so that the generated electrolytic treatment nutrient solution has a higher dissolved oxygen concentration than the gas-dissolved ozone water. Moreover, according to the said ozone sterilizer 3, the electrolytic treatment nutrient solution of arbitrary residual melt | dissolution ozone concentration can be obtained in a utilization range with the value of the electrolysis electric current at the time of electrolysis.

  Next, the operation of the hydroponic cultivation facility 100 of the present embodiment (a hydroponic cultivation method using this facility) will be described with reference to FIG.

  When the nutrient solution cultivation facility 100 is operated, first, the nutrient solution is fed from the nutrient solution tank 2 to the anode-side channel 34 of the ozone sterilizer 3 by the supply pump P1 for a predetermined time (for example, 20 minutes: sterilization time). Supply via sterilization path 12. Then, ozone is generated in the nutrient solution by electrolysis in the anode side flow path 34 to generate an electrolytic treatment nutrient solution. It should be noted that after the predetermined time (20 minutes: sterilization time) has elapsed, for a predetermined time (for example, 5 minutes: acid cleaning time), the cathode side channel 35 is supplied to the cleaning agent tank 5 via the cleaning path 14 by the supply pump P3. The water containing the citric acid stored in the inside is supplied, and the inside of the cathode side flow path 35 is acid-washed. This is because the impurities adhering to the cathode electrode 33 are dissolved and removed, the voltage during electrolysis is kept constant, and continuous operation of the hydroponic cultivation equipment for a long time is enabled.

  Then, the electrolytic treatment nutrient solution is returned from the anode side channel 34 to the nutrient solution tank 2 via the nutrient solution sterilization path 12. Further, timely liquid fertilizer is supplied from the top fertilizer tank 4 to the nutrient solution tank 2 via the path 13.

  Then, the nutrient solution containing the electrolytic treatment nutrient solution and the liquid fertilizer in the nutrient solution tank 2 is periodically fed from the nutrient solution tank 2 to the cultivation bed 1 through the nutrient solution supply / discharge path 10 by the nutrient solution supply pump P2. 1 is supplied. By supplying the nutrient solution containing the electrolytic treatment nutrient solution and liquid fertilizer in the nutrient solution tank 2 to the cultivation bed 1, the nutrient components are supplied to the plants arranged in the cultivation bed 1 and the cultivation bed 1 is configured. Equipment materials such as cultivation tanks, beds, and pipes to be sterilized can be sterilized by residual dissolved ozone in the electrolytic treatment nutrient solution. The nutrient solution supply pump P2 is not limited to a so-called submersible pump immersed in the nutrient solution in the nutrient solution tank 2, and may be a water supply pump disposed outside the nutrient solution tank 2. Further, the acid stored in the cleaning agent tank 5 is not limited to citric acid, and may be an organic acid other than citric acid or a neutral salt added to the organic acid.

  The nutrient solution discharged from the cultivation bed 1 without being absorbed by the plant in the cultivation bed 1 returns to the nutrient solution tank 2 via the nutrient solution supply / discharge path 11 and is supplied from the additional fertilizer tank 4 in the nutrient solution tank 2. The liquid fertilizer and the nutrient solution containing the electrolytic treatment nutrient solution supplied from the ozone sterilizer 3 are mixed and used between the nutrient solution tank 2 and the cultivation bed 1. The nutrient solution returned from the cultivation bed 1 to the nutrient solution tank 2 may be contaminated with pathogenic bacteria, but in addition to being directly sterilized by electrolysis in the process of being supplied to the ozone sterilizer 3, ozone Since it is sterilized by the residual dissolved ozone of the electrolytic treatment nutrient solution supplied from the sterilizer 3 to the nutrient solution tank 2, it is possible to prevent contamination by pathogenic bacteria associated with the circulation use of the nutrient solution.

  Thus, the electrolytic treatment nutrient solution produced | generated by the ozone sterilizer 3 is supplied to the cultivation bed 1 via the nutrient solution supply / discharge path | route 10. FIG. The supplied electrolytic treatment nutrient solution also cleans and sterilizes equipment materials such as cultivation tanks, beds, and pipes that make up the cultivation bed 1 and the plant root system, so that the germs that adhere to the cultivation bed 1 and plants can be sterilized. The disease can be suppressed. In other words, by appropriately supplying electrolytic treatment nutrient solution directly to the cultivation bed 1 and sterilizing equipment materials and plants such as beds and pipes, transmission of pathogenic bacteria from water and nutrient solution to plants, seedling raising materials, hoses It is possible to effectively control diseases such as infection of plants with pathogenic bacteria from pipes, etc., and it is possible to prevent the occurrence and spread of diseases. In particular, by periodically supplying the electrolytic treatment nutrient solution to the cultivation bed 1, it is possible to prevent the formation of a biofilm that is a hotbed of pathogenic bacteria. In addition, in the liquid culture method or the NFT solution culture system, the root system of the plant directly touches the nutrient solution. Therefore, the electrolytic treatment nutrient solution is periodically supplied to the cultivation bed 1 for the nutrient solution culture of these methods. If the structure which carries out is employ | adopted, the control effect of the disease (root rot, black root disease etc.) derived from the pathogenic microbe adhering to a root can be heightened more.

  Here, FIG. 2 is a graph showing the number of bacteria in the nutrient solution before and after electrolysis in the ozone sterilizer 3. The left graph in FIG. 2 shows the number of bacteria in the nutrient solution before the electrolysis treatment, and the right graph in FIG. 2 shows the number of bacteria in the nutrient solution (electrolytic treatment nutrient solution) immediately after the electrolysis treatment. Is shown. The vertical axis indicates the number of bacteria (the number of general bacteria) (CFU / mL). The amount of nutrient solution supplied to the ozone sterilizer 3 was 3 liters / min, and the value of the electrolysis current at the time of electrolysis was 40A. FIG. 3 is a graph showing the change in the number of bacteria and the change in pH value of the nutrient solution over time in the nutrient solution tank 2. The horizontal axis is the elapsed time (min) after electrolysis in the ozone sterilizer 3 (treatment time), and the vertical axis is the number of bacteria in the nutrient solution tank 2 (log 10 CFU / mL) and the pH value of the nutrient solution. It is.

As shown in FIG. 2, the initial number of bacteria in the nutrient solution before the electrolysis treatment is 10 ⁴ CFU / mL, but the number of bacteria in the nutrient solution immediately after the electrolysis treatment is less than 10 ¹ CFU / mL. It has decreased to. That is, in a short time when the nutrient solution passes through the ozone sterilizer 3, the number of bacteria in the nutrient solution is rapidly reduced. In addition, as shown in FIG. 3, the initial number of bacteria in the nutrient solution tank 2 before the electrolysis treatment was 10 ⁴ CFU / mL, whereas the number of bacteria in the nutrient solution tank 2 was about 60 minutes. It has decreased to below the detection limit. Further, the pH value of the nutrient solution in the nutrient solution tank 2 before the electrolysis treatment was pH 7, but at about 60, the pH value decreased to pH 3 and was acidified.

  In this way, after the nutrient solution in the nutrient solution tank 2 is sterilized via the ozone sterilizer 3, the nutrients used for the entire nutrient solution cultivation facility 100 are repeated while repeating the process of returning to the nutrient solution tank 2 again. The total amount of the liquid and the entire hydroponic equipment 100 can be sterilized.

  According to 1st Embodiment demonstrated above, the nutrient solution supplied to the cultivation bed 1 can be electrolyzed within the anode side flow path 34 of the ozone sterilizer 3, and ozone can be directly produced | generated in a nutrient solution. And since ozone is produced | generated directly from a nutrient solution, sterilization of the pathogenic microbe derived from a nutrient solution can be achieved reliably. Moreover, since an electric current flows in a nutrient solution by the electrolysis in the anode side flow path 34 of the ozone sterilizer 3, the sterilization effect with respect to the pathogenic microbe etc. in a nutrient solution can be improved with an electric shock. Further, when sulfate, nitrate, phosphate, etc. are contained in the liquid fertilizer in the nutrient solution, sulfate, nitrate, phosphate, etc. contained in the nutrient solution are electrolyzed in the anode side flow path 34. As a result, the pH value in the nutrient solution decreases (acidification), and even if the nutrient solution is stored in the nutrient solution tank 2, an increase in the number of bacteria can be suppressed and the bactericidal effect can be maintained.

(Second Embodiment)
FIG. 4 is a block diagram showing a hydroponic cultivation facility 200 according to the second embodiment of the present invention. In addition, in the following description, the same code | symbol is attached | subjected about the same structural member as the hydroponic cultivation equipment 100 which concerns on the above-mentioned 1st Embodiment, and the description is abbreviate | omitted suitably.

  As shown in FIG. 4, the main difference between the second embodiment and the first embodiment is that in the second embodiment, cultivation is performed from the nutrient solution tank 2 via the anode-side flow path 34 of the ozone sterilizer 3. The nutrient solution is supplied to the bed 1 and the nutrient solution is returned from the cultivation bed 1 to the nutrient solution tank 2. That is, the difference from the first embodiment is that the ozone sterilizer 3 is provided in the nutrient solution supply / discharge path 10 between the nutrient solution tank 2 and the cultivation bed 1.

  Specifically, the nutrient solution supply / discharge route 10 (nutrient solution sterilization route) is a route for supplying the nutrient solution in the nutrient solution tank 2 to the cultivation bed 1 via the ozone sterilizer 3. The nutrient solution supply / discharge route 11 (nutrient solution sterilization route) is a route connecting the cultivation bed 1 and the nutrient solution tank 2. The nutrient solution supply / discharge path 10 is configured to pass through the anode-side flow path 34 of the ozone sterilizer 3. The path 13 is a path that connects the top fertilizer tank 4 and the nutrient solution tank 2. Further, the cleaning path 14 is a path that connects the cleaning agent tank 5 and the ozone sterilizer 3. And the washing | cleaning path | route 14 is comprised so that the cathode side flow path 35 of the ozone sterilizer 3 may be passed.

  According to the nutrient solution cultivation facility 200 of the second embodiment, since the ozone sterilizer 3 is arranged in front of the cultivation bed 1, the nutrient solution is supplied to the plant arranged in the cultivation bed 1. Sterilization with an electrolytic treatment nutrient solution can be performed. Moreover, since the ozone sterilizer 3 and the cultivation bed 1 are arrange | positioned on the same path | route, the structure of the hydroponic cultivation equipment 200 can be made simple.

  In addition, since the ozone sterilizer 3 and the cultivation bed 1 are arrange | positioned on the same path | route in the nutrient solution cultivation equipment 200 which concerns on 2nd Embodiment, the sterilization process of a nutrient solution at the time of supply of the nutrient solution to the cultivation bed 1 There is an advantage that you can. On the other hand, in the nutrient solution cultivation equipment 100 according to the first embodiment, the route passing through the ozone sterilizer 3 does not pass through the cultivation bed 1, so that the nutrient solution in the nutrient solution tank 2 can be individually sterilized. it can. That is, there is an advantage that the nutrient solution can be sterilized for convenience.

(Third embodiment)
FIG. 5 is a block diagram showing a hydroponic cultivation facility 300 according to the third embodiment of the present invention. In addition, in the following description, the same code | symbol is attached | subjected about the same structural member as the hydroponic cultivation equipment 100 which concerns on the above-mentioned 1st Embodiment, and the description is abbreviate | omitted suitably.

  As shown in FIG. 5, the main difference between the third embodiment and the first embodiment is that in the third embodiment, an alkali that stores an alkaline substance such as sodium hydroxide or potassium hydroxide as an alkali supply means is used. A water storage tank 301, an alkaline water supply path 302 for supplying alkaline water to the nutrient solution tank 2, and a pH value measuring device 303 for measuring the pH value of the nutrient solution in the nutrient solution tank 2 are provided.

  When the liquid fertilizer supplied from the top fertilizer tank 4 to the nutrient solution in the nutrient solution tank 2 contains sulfate, nitrate, etc., the sulfate, nitrate, etc. contained in the nutrient solution are in the anode-side channel 34. By electrolysis, the pH value in the nutrient solution is lowered and acidified. A certain degree of acidification can suppress the increase in the number of bacteria and is effective in maintaining the bactericidal effect, but is cultivated in the cultivation bed 1 when the pH value in the nutrient solution is too low (extreme acidification). Plant damage may be caused by acid.

  Then, according to the nutrient solution cultivation equipment 300 of the said 3rd Embodiment, according to the said structure, an alkaline substance is added to the acidified nutrient solution and the nutrient solution is neutralized, and the obstacle by the acid of a plant is avoided. Can do. Here, when the value of the pH value measuring device 303 becomes a predetermined value (for example, less than pH 4), the alkaline substance is added from the alkaline water storage tank 301 to the nutrient solution tank 2. In addition, potassium hydroxide, sodium hydroxide, etc. are raised to the alkaline substance used here. Even in this case, since the nutrient solution is once acidic, a bactericidal effect due to a decrease in pH value can be expected.

(Fourth embodiment)
FIG. 6 is a block diagram showing a hydroponic cultivation facility 400 according to the fourth embodiment of the present invention. In addition, in the following description, the same code | symbol is attached | subjected about the same structural member as the hydroponic cultivation equipment 100 which concerns on the above-mentioned 1st Embodiment, and the description is abbreviate | omitted suitably.

  As shown in FIG. 6, the main difference between the fourth embodiment and the first embodiment is that in the fourth embodiment, the anode side channel 34 and the cathode side channel of the ozone sterilizer 3 from the nutrient solution tank 2 are used. The nutrient solution is supplied to the cultivation bed 1 via the order 35 and the nutrient solution is returned from the cultivation bed 1 to the nutrient solution tank 2. In the present embodiment, the cleaning path 14 and the cleaning agent tank 5 are not provided.

  Specifically, the nutrient solution supply / discharge route 10 (nutrient solution sterilization route) is configured to transfer the nutrient solution in the nutrient solution tank 2 from the nutrient solution tank 2 to the anode side channel 34 and the cathode side channel 35 of the ozone sterilizer 3. This is a route for supplying nutrient solution to the cultivation bed 1 through the order. The nutrient solution supply / discharge route 11 is a route for returning the nutrient solution from the cultivation bed 1 to the nutrient solution tank 2. That is, the nutrient solution supply / discharge path 10 is configured to pass through the cathode side flow path 35 after passing through the anode side flow path 34 of the ozone sterilizer 3. The path 13 is a path that connects the top fertilizer tank 4 and the nutrient solution tank 2.

  According to the nutrient solution cultivation equipment 400 of the fourth embodiment, the nutrient solution can be supplied to the cultivation bed 1 in the order of the anode side channel 34 and the cathode side channel 35. Then, the nutrient solution which has been passed through the anode-side flow path 34 and electrolyzed to lower the pH value (acidification) can be neutralized by being passed through the cathode-side flow path 35 and electrolyzed. it can. For this reason, without adding an alkaline substance etc., the inside of a nutrient solution is neutralized and the disorder | damage | failure by the acid of the plant cultivated on the cultivation bed 1 can be avoided.

(Fifth embodiment)
FIG. 7 is a block diagram showing a hydroponic cultivation facility 500 according to the fifth embodiment of the present invention. In addition, in the following description, the same code | symbol is attached | subjected about the same structural member as the hydroponic cultivation equipment 400 which concerns on the above-mentioned 4th Embodiment, and the description is abbreviate | omitted suitably.

  As shown in FIG. 7, the main difference between the fifth embodiment and the fourth embodiment is that the fifth embodiment includes a second nutrient solution tank 502. That is, the nutrient solution is temporarily stored in the second nutrient solution tank 502 after passing through the anode-side flow path 34 of the ozone sterilizer 3 from the nutrient solution tank 2. For convenience, the nutrient solution stored in the second nutrient solution tank 502 is cultivated from the second nutrient solution tank 502 via the cathode-side flow path 35 of the ozone sterilizer 3 using the pump P5 as necessary. The nutrient solution is supplied to the bed 1 and can be returned from the cultivation bed 1 to the nutrient solution tank 2.

  According to the nutrient solution cultivation equipment 500 of the fifth embodiment, ozone is generated in the nutrient solution in the anode-side flow path 34 of the ozone sterilizer 3 to generate the electrolytic treatment nutrient solution, and then the second nutrient solution tank 502 Once stored. Then, when the cultivation bed 1 needs to be sterilized with the electrolytic treatment nutrient solution, the electrolytic treatment nutrient solution stored in the second nutrient solution tank 502 can be supplied to the cultivation bed 1 as appropriate. Further, the nutrient solution whose pH value has been reduced by electrolysis in the anode-side channel 34 (acidification) can be neutralized by being passed through the cathode-side channel 35 and electrolyzed.

(Sixth embodiment)
FIG. 8 is a block diagram showing a hydroponic cultivation facility 600 according to the sixth embodiment of the present invention. In addition, in the following description, the same code | symbol is attached | subjected about the same component as the hydroponics equipment 500 concerning the above-mentioned 5th Embodiment, and the description is abbreviate | omitted suitably.

  The main difference between the sixth embodiment and the fifth embodiment is that, as shown in FIG. 8, in the sixth embodiment, citric acid and chloride for acid cleaning the cathode side flow path 35 of the ozone sterilizer 3 are used. A cleaning agent tank 601 that stores a mixed solution of sodium, a cleaning path 602 that connects the cleaning agent tank 601 and the cathode-side flow path 35 of the ozone sterilization apparatus 3, and a cathode side flow of the ozone sterilization apparatus 3 in the cleaning path 602 A solenoid valve V2 for controlling the injection of citric acid and sodium chloride supplied to the cleaning agent tank 601 from the path 35, and supplied to the cultivation bed 1 from the cathode side flow path 35 of the ozone sterilizer 3 in the path 504. The electromagnetic valve V1 for controlling the injection of the nutrient solution is provided.

  According to the nutrient solution cultivation facility 600 of the sixth embodiment, ozone is generated in the nutrient solution in the anode-side flow path 34 of the ozone sterilizer 3 and sterilized, and then temporarily stored in the second nutrient solution tank 502. it can. Here, the nutrient solution stored in the second nutrient solution tank 502 is electrolyzed in the anode-side flow path 34 and has a pH value lowered (acidified).

  Then, with the electromagnetic valve V2 closed and the electromagnetic valve V1 opened, the nutrient solution stored in the second nutrient solution tank 502 for convenience is supplied to the cathode-side channel 35 by the pump P5. Then, the nutrient solution having a lowered pH value (acidified) is neutralized by electrolysis in the cathode-side flow path 35. Then, the neutralized nutrient solution can be supplied to the cultivation bed 1.

  At a desired timing, with the solenoid valve V1 closed and the solenoid valve V2 opened, the mixture liquid of citric acid and sodium chloride appropriately stored in the cleaning agent tank 601 is supplied by the supply pump P3 to the cathode-side flow path 35. To supply. That is, a mixed liquid of citric acid and sodium chloride in the cleaning agent tank 601 is supplied to the cathode-side channel 35 via the cleaning path 602, and the cathode electrode 33 disposed in the cathode-side channel 35 is connected to the acid channel. Wash.

  Here, FIG. 9 is a graph showing changes in the pH value of the nutrient solution and the electrolysis voltage with the lapse of time of the electrolysis process in the ozone sterilizer 3. The horizontal axis is the time lapse (min) after electrolysis in the ozone sterilizer 3 (treatment time), and the vertical axis is discharged from the anode side channel 34 and the cathode side channel 35 in the ozone sterilizer 3. PH value of the nutrient solution and electrolytic voltage (V) of the ozone sterilizer 3. The electrolysis current is 20A. Moreover, the supply amount of the nutrient solution supplied to the anode side flow path 34 is 2 liters / min, and the supply amount of the nutrient solution supplied to the cathode side flow path 35 is 1.7 liters / min. Further, as described above, a mixed solution of citric acid and sodium chloride is used for the acid cleaning of the cathode electrode 33 in the cathode side channel 35. Then, the continuous operation time of the electrolysis process in the ozone sterilizer 3 is about 20 minutes, and immediately after that, the acid cleaning of the cathode electrode 33 in the cathode side channel 35 is performed for about 5 minutes, and this process is repeated for 120 minutes. Yes. In FIG. 9, the square plot indicates the pH value of the nutrient solution discharged from the anode-side flow path 34, and the triangular plot indicates the pH value of the nutrient solution discharged from the cathode-side flow path 35, The circle plot shows the electrolysis voltage.

  As shown in FIG. 9, the pH value of the electrolytic treatment nutrient solution discharged from the anode-side flow path 34 and electrolyzed is about 3 acidic. When this nutrient solution is passed through the cathode-side channel 35 and electrolyzed, the pH value of the nutrient solution is neutralized to about 5-6. However, if the above operation is continued for about 20 minutes, the electrolysis voltage rises from 6V to 12V. And it turns out that electrolysis efficiency falls with the raise of this electrolysis voltage, and the neutralization performance of the nutrient solution by the electrolysis in the cathode side flow path 35 falls (refer triangle plot). At this time, when the above operation is temporarily stopped and the cathode electrode 33 of the cathode side channel 35 is acid-washed by passing a mixed solution of citric acid and sodium chloride for about 5 minutes, the electrolysis voltage decreases to the initial 6V. Thus, the neutralization performance of the nutrient solution by electrolysis is restored.

  Thus, the electrolysis voltage increases due to the impurities attached to the cathode electrode 33 provided in the cathode-side flow path 35 with the electrolysis treatment for 20 minutes in the ozone sterilizer 3, and the long-time hydroponic equipment 600 may not be possible. Accordingly, the acid-washing of the cathode-side channel 35 dissolves and removes the impurities attached to the cathode electrode 33, and the electrolytic voltage is lowered to enable continuous operation of the hydroponic cultivation facility 600 for a long time.

(Seventh embodiment)
FIG. 10 is a block diagram showing a hydroponic cultivation facility 700 according to the seventh embodiment of the present invention. In addition, in the following description, the same code | symbol is attached | subjected about the same structural member as the hydroponic cultivation equipment 100 which concerns on the above-mentioned 1st Embodiment, and the description is abbreviate | omitted suitably.

  As shown in FIG. 10, a nutrient solution cultivation facility 700 according to this embodiment includes a cultivation bed 1 in which plants are arranged, a nutrient solution tank 2 for storing a nutrient solution supplied to the cultivation bed 1, and a predetermined nutrient solution. Ozone sterilization apparatus 3 that applies an electric current of an electric current value, electrolytic fertilizer tank 4 that stores liquid fertilizer to be supplied to nutrient solution tank 2, and cleaning that stores citric acid for acid cleaning ozone sterilization apparatus 3 An agent tank 710, an alkaline water storage tank 711 for storing alkaline water, and a water softener 701 for supplying water are provided. And these each apparatus is mutually connected by paths, such as piping.

  The nutrient solution supply / discharge paths 10 and 11 are paths that connect the nutrient solution tank 2 and the cultivation bed 1, respectively. The nutrient solution sterilization path 12 is a path that connects the nutrient solution tank 2 and the ozone sterilizer 3. And the nutrient solution sterilization path | route 12 is comprised so that the anode side flow path 34 of the ozone sterilizer 3 may be passed. The path 13 is a path that connects the top fertilizer tank 4 and the nutrient solution tank 2. The cleaning path 14 is a path that connects the cleaning agent tank 710 and the ozone sterilizer 3. And the washing | cleaning path | route 14 is comprised so that the cathode side flow path 35 of the ozone sterilizer 3 may be passed. The alkaline water supply path 302 is a path that connects the alkaline water storage tank 711 that stores alkaline water such as sodium hydroxide or potassium hydroxide and the nutrient solution tank 2. The path 704 is a path that connects the cathode-side flow path 35 of the ozone sterilizer 3 and the alkaline water reservoir 711. The path 705 is a path that connects the anode-side flow path 34 of the ozone sterilizer 3 and the cultivation bed 1. Furthermore, the path 702 is a path that connects the water softener 701 and the anode-side flow path 34 of the ozone sterilizer 3, and the path 703 connects the water softener 701 and the cathode-side flow path 35 of the ozone sterilizer 3. It is a route.

  A supply pump P1 and a check valve 40 are attached to the nutrient solution sterilization path 12 from the upstream side. The check valve 40 is a valve for preventing the backflow of the nutrient solution in the nutrient solution sterilization path 12. Further, a nutrient solution supply pump P2 is connected to upstream ends of the nutrient solution supply / discharge paths 10 and 11, and the nutrient solution supply pump P2 is installed at the bottom of the nutrient solution tank 2. A supply pump P3 and a check valve 41 are attached to the cleaning path 14 from the upstream side. The check valve 41 is a valve for preventing the backflow of citric acid in the cleaning path 14. A pump P4 is connected to the upstream end of the alkaline water supply path 302, and the pump P4 is installed at the inner bottom of the alkaline water storage tank 711.

  Further, in the path 702, an electromagnetic valve V4 for controlling injection of water supplied from the water softener 701 into the anode-side flow path 34 of the ozone sterilizer 3 is provided. In the path 703, an electromagnetic valve V3 for controlling injection of water supplied from the water softener 701 into the cathode-side flow path 35 of the ozone sterilizer 3 is provided. In the nutrient solution sterilization path 12, an electromagnetic valve V <b> 10 is provided for controlling the injection of the electrolytic treatment nutrient solution generated in the anode side flow path 34 of the ozone sterilizer 3 into the nutrient solution tank 2. In the path 705, an electromagnetic valve V11 for controlling injection of the electrolytic treatment nutrient solution generated in the anode-side flow path 34 of the ozone sterilizer 3 into the cultivation bed 1 is provided. In the cleaning path 14, an electromagnetic valve V <b> 2 for controlling injection of citric acid supplied from the cathode side flow path 35 of the ozone sterilizer 3 to the cleaning agent tank 710 is provided. In the path 704, an electromagnetic valve V1 for controlling injection of water (alkaline water) supplied from the cathode-side flow path 35 of the ozone sterilizer 3 to the alkaline water storage tank 711 is provided.

  According to the above configuration, first, in a state where the supply of the nutrient solution to the anode-side channel 34 by the supply pump P1 is interrupted, the solenoid valve V4 and the solenoid valve V3 are opened and the anode-side channel 34 and the cathode-side channel 35 are opened. Then, water from the water softener 701 is supplied and electrolysis is performed to obtain alkaline water in the cathode side flow path 35. The alkaline water is stored in the alkaline water reservoir 711 with the electromagnetic valve V2 closed and the electromagnetic valve V1 opened. Then, the alkaline water is supplied to the nutrient solution tank 2 through the alkaline water supply path 302 to adjust the pH value of the nutrient solution in the nutrient solution tank 2. At this time, ozone water generated in the anode-side flow path 34 is supplied to the cultivation bed 1 and used for sterilization. When the electromagnetic valve V4 is closed and the nutrient solution is supplied to the anode-side channel 34 and sterilization is performed using the production of the electrolytic treatment nutrient solution by electrolysis, acid cleaning is performed in the cathode-side channel 35. Since it is necessary, the solenoid valve V3 and the solenoid valve V1 are closed and the solenoid valve V2 is opened, so that the water supplied from the water softener 701 is stopped and citric acid in the cleaning agent tank 710 is supplied. Moreover, the nutrient solution containing the electrolytic treatment nutrient solution can be returned to the nutrient solution tank 2 or supplied to the cultivation bed 1 by selecting the opening and closing of the solenoid valve V10 and the solenoid valve V11 for convenience.

  According to the nutrient solution cultivation facility 700 of the seventh embodiment, the alkaline substance used for adjusting the pH value of the nutrient solution stored in the alkaline water tank 711 is generated by electrolysis in the cathode-side channel 35. Alkaline water can be used.

  In the above-described embodiment, the acid used for sterilization, the cleaning liquid containing the acid, citric acid, a mixed liquid of citric acid and sodium, and the like, but instead, succinic acid, fumaric acid, gluconic acid, etc. An organic acid having high solubility of Ca salt, or a neutral salt such as sodium sulfate or potassium nitrate may be employed.

  Although various embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims.

DESCRIPTION OF SYMBOLS 1 Cultivation bed 2 Nutrient solution tank 3 Ozone sterilizer 4 Additional fertilizer tank 5 Cleaning agent tank 10, 11 Nutrient solution supply / discharge route 12 Nutrient solution sterilization route 14 Washing route 34 Anode side channel 35 Cathode side channel 100, 200, 300, 400, 500, 600, 700 Hydroponics equipment

Claims (10)

A cultivation bed in which plants are placed;
A nutrient solution tank for storing a nutrient solution to be supplied to the cultivation bed;
An ozone sterilizer,
A nutrient solution sterilization path for sending the nutrient solution from the nutrient solution tank to the ozone sterilizer and returning the nutrient solution from the ozone sterilizer to the nutrient solution tank;
A hydroponic cultivation facility characterized by comprising: The ozone sterilizer is
An anode side channel provided on one of the electrolyte membrane and the electrolyte membrane, and a cathode side channel provided on the other side of the electrolyte membrane, generating ozone in the anode side channel;
The nutrient solution sterilization path is characterized in that the nutrient solution is sent from the nutrient solution tank to the anode-side flow path of the ozone sterilizer, and the nutrient solution is returned from the anode-side channel to the nutrient solution tank. The hydroponic equipment according to claim 1.   The nutrient solution sterilization path supplies the nutrient solution from the nutrient solution tank to the cultivation bed via the anode-side flow path of the ozone sterilizer, and supplies the nutrient solution from the cultivation bed to the nutrient solution tank. The hydroponic equipment according to claim 2, wherein the hydroponic equipment is returned.   The nutrient solution cultivation equipment according to any one of claims 1 to 3, wherein an alkali supply means for adding an alkaline substance to the nutrient solution tank is provided.   The nutrient solution sterilization path is configured to supply the nutrient solution to the cultivation bed from the nutrient solution tank via the anode-side channel and the cathode-side channel of the ozone sterilizer, and from the cultivation bed, the The nutrient solution cultivation equipment according to claim 2, wherein the nutrient solution is returned to the nutrient solution tank.   The hydroponic cultivation equipment according to any one of claims 2 to 5, further comprising an acid cleaning means for cleaning the cathode side channel with an acid. The nutrient solution is sent from the nutrient solution tank storing the nutrient solution to be supplied to the cultivation bed to the ozone sterilizer,
In the ozone sterilizer, ozone is generated in the nutrient solution by electrolysis,
The nutrient solution cultivation method, wherein the nutrient solution is returned from the ozone sterilizer to the nutrient solution tank. The ozone sterilizer is
An anode side channel provided in one of the electrolyte membrane and the electrolyte membrane and a cathode side channel provided in the other of the electrolyte membrane;
Sending the nutrient solution from the nutrient solution tank storing the nutrient solution supplied to the cultivation bed to the anode-side flow path of the ozone sterilizer,
In the anode channel, ozone is generated in the nutrient solution by electrolysis,
The nutrient solution cultivation method according to claim 7, wherein the nutrient solution is returned from the anode-side channel to the nutrient solution tank. In the anode channel, after ozone is generated in the nutrient solution by electrolysis,
Supplying the nutrient solution from the anode-side channel to the cultivation bed,
The nutrient solution cultivation method according to claim 8, wherein the nutrient solution is returned from the cultivation bed to the nutrient solution tank. In the anode channel, after ozone is generated in the nutrient solution by electrolysis,
Sending the nutrient solution from the anode side channel to the cathode side channel of the ozone sterilizer,
Supplying the nutrient solution to the cultivation bed from the cathode-side channel;
The nutrient solution cultivation method according to claim 8, wherein the nutrient solution is returned from the cultivation bed to the nutrient solution tank.

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