JP2022172020A - Negative pressure-based culture solution production device, and nutriculture system employing the same - Google Patents

Abstract

To provide a culture solution production device which provides at least one effect selected from facilitating maintenance, enabling reduction in installation cost, and making it possible to facilitate maintenance and management during operation, and a nutriculture system employing the same.SOLUTION: A culture solution production device for producing a culture solution by feeding a culture stock solution to raw water stored in a culture solution storage tank comprises: the culture solution storage tank for storing the culture solution; and a pump for pumping the culture solution stored in the culture solution storage tank. A downstream side of the pump is provided with: a culture solution feeding pipeline for feeding the culture solution to a plant; and a circulating pipeline for returning it to the culture solution storage tank.SELECTED DRAWING: Figure 1

Description

The present invention relates to a culture solution preparation device for preparing a culture solution or the like used for hydroponics by mixing raw water with a culture solution, and a hydroponic cultivation system using the same, particularly for transferring raw water, culture solution, and culture solution. The present invention relates to a culture solution preparation device using a reduced number of pumps and a hydroponics system using the same. The present invention also relates to a solution preparation apparatus for preparing not only the undiluted culture solution but also a solution in which chemicals and other liquid components used in facilities and equipment are mixed in water.

2. Description of the Related Art Conventionally, devices have been provided for mixing various liquid components such as chemicals and nutrients into water used in facilities and equipment. 2. Description of the Related Art For example, apparatuses for mixing chemical solutions into water used in various manufacturing and treatment processes in facilities such as factories, or for mixing various chemical solutions in water in water supply facilities have been provided. Especially in the field of agriculture, in hydroponics, which has become widespread in recent years, a culture solution preparation apparatus is used that mixes various components such as nutrients and chemicals into raw water in order to prepare a culture solution to be supplied to plants.

Regarding a cultivation liquid supply device for such hydroponics, the applicant of the present patent application also proposed a liquid supply device that can accurately manage the concentration of fertilizer components in the nutrient solution in Patent Document 1 (Japanese Patent Application Laid-Open No. 2018-33333). there is In this document 1, a raw water supply unit that supplies raw water, a fertilizer supply unit that supplies fertilizer, and the raw water supplied from the raw water supply unit and the fertilizer supplied from the fertilizer supply unit are mixed and nourished. a liquid mixing unit, a first electrical conductivity measuring unit for measuring the electrical conductivity of the raw water supplied by the raw water supply unit, and a first electrical conductivity measuring unit for measuring the electrical conductivity of the nutrient solution mixed in the mixing unit. 2 based on the electrical conductivity measurement unit, the electrical conductivity of the raw water measured by the first electrical conductivity measurement unit, and the electrical conductivity of the nutrient solution measured by the second electrical conductivity measurement unit, A liquid supply device is proposed that includes a controller that controls the supply of the fertilizer by the fertilizer supply unit.

Further, in Patent Document 2 (Japanese Patent Application Laid-Open No. 63-36720), as a method and apparatus for supplying a culture solution in hydroponics, a culture solution is supplied to a medium at a preset time, and the set time and the proposed a method of feeding a culture solution in hydroponic cultivation in which the illuminance is detected and the culture solution is supplied according to the detected illuminance. In this document, ``the undiluted solution supply pipes 7 and 8 are connected to the circulation tube 10 through a mixer 10a for mixing the undiluted solution of the culture solution and feeding it into the storage tank 1,'' and ``storage When water is fed until the liquid height in the liquid tank 1 reaches a preset level, the water supply pump 11 is stopped and/or the electric valve 11a is closed to stop the water supply, and then the circulation pump 9 is operated. The culture solution in the storage tank 1 is circulated through the circulation pipe 10, and the supplied water and the already remaining culture solution are sufficiently stirred and mixed,” and “the concentration of the stirred culture solution The undiluted solution is supplied until the set concentration is reached, and when the electric conductivity sensor 13 detects that the set concentration has been reached, the electromagnetic valves 5 and 6 are closed to stop the undiluted solution supply. disclosed. "At the set time, the liquid supply pump 15 is activated by a signal from the timer circuit, and the culture liquid stored in the liquid storage tank 1 is pumped through the strainer 17 and the supply pipe 16. supply to medium 2".

JP 2018-33333 A JP-A-63-36720

As described above, the applicant of the present application also proposed a culture solution supply device for hydroponics in Patent Document 1, but the culture solution to be supplied to the plants is fed with fertilizer into the raw water guided by the raw water supply channel. It is mixed and no storage tank for culture solution is used. In this regard, in Patent Document 2, a storage tank is used for storing a culture solution set to a predetermined concentration by mixing the undiluted solution of the culture solution with the raw water.

In the embodiment of Patent Document 1, a water pump that feeds raw water and an injection pump that injects fertilizer into the mixing portion with the raw water are used. A circulation pump for circulating the culture medium and a feed pump for supplying the culture medium from the liquid storage tank to the medium are used.

Here, in the nutrient solution culture apparatus, groundwater or river water is often used as raw water, and even if a strainer or filter is installed, it is impossible to avoid contamination of the raw water with foreign substances such as fine earth and sand. Fine foreign matter may be mixed in pumps for transferring raw water, chemicals (or fertilizers), etc. Therefore, it is advantageous in terms of maintenance to have as few pumps as possible.

In addition, if a large number of pumps are installed, the cost increases accordingly. Therefore, it is desirable to use a small number of pumps in terms of introduction costs. Furthermore, if the number of pumps for transferring raw water, chemicals (or fertilizer), etc. increases, the management for supplying a certain amount of culture solution with a predetermined concentration becomes complicated, so maintenance during operation becomes complicated.

Therefore, in order to solve these problems, the present invention provides a culture medium that can obtain at least any of the following effects: easy maintenance, reduced installation costs, and easy maintenance during operation. An object of the present invention is to provide a liquid preparation device and a hydroponics system using the device.

In addition, in the present invention, it is possible to prepare not only solution cultivation but also a solution in which liquid components such as drugs and various compounding ingredients are mixed in water in equipment and facilities, etc., and preparation of the solution and supply of the solution can be performed in one It is another object to provide a solution preparation apparatus that can be operated by one pump and a solution supply system using the same. Another object of the present invention is to provide a solution preparation device and a solution supply system using the device that can reliably stir and mix liquid components into raw water.

In order to solve at least one of the above problems, the present invention provides a solution preparation apparatus capable of preparing a solution in which a liquid component is mixed in water by using a pump that supplies a solution in which a liquid component is mixed. and a solution supply system using the same.

Such a solution preparation apparatus is a solution preparation apparatus for preparing a solution by supplying a liquid component such as a chemical solution to raw water supplied to facilities or equipment, and includes a solution storage tank for storing a solution mixed with a liquid component. , a pump that feeds the solution in the solution storage tank, and downstream of the pump, a solution supply pipe that supplies the solution to the facility or equipment, and a circulation pipe that returns the solution to the solution storage tank. can be configured

In the above-described solution preparation apparatus, the liquid component can be directly put into the solution storage tank, or can be supplied to the main pipe provided between the pump and the solution storage tank. In addition, the liquid component includes chemicals, paints, and compounding components used in facilities such as factories and water and sewage systems, or equipment and devices, and may also be various components such as liquid fertilizers and liquid pesticides in solution cultivation. .

In order to solve at least one of the above problems, the present invention provides a culture solution preparation apparatus capable of preparing a culture solution by using a pump for supplying the culture solution to crops, and a nutrient solution using the same. Provide a cultivation system.

That is, in the present invention, there is provided a culture medium preparation apparatus for preparing a culture medium by supplying a culture stock solution to raw water stored in a culture medium storage tank, comprising: a culture medium storage tank for storing the culture medium; A pump for feeding the culture solution in the liquid storage tank, and a culture solution supply pipe for supplying the culture solution to the plant and a circulation pipe for returning the culture solution to the culture solution storage tank are provided on the downstream side of the pump. Provided is a culture medium preparation device that is

In such a culture medium preparation apparatus, the undiluted culture liquid can be supplied to the main pipe provided between the pump and the culture medium storage tank in addition to being supplied into the secondary culture medium storage tank.

Further, according to the present invention, there is provided a culture medium preparation apparatus for preparing a culture medium by supplying a culture undiluted solution to raw water stored in a culture medium storage tank, the pump for feeding the culture solution in the culture medium storage tank. and a culture stock solution supply pipe connected to a main pipe provided between the pump and the culture solution storage tank, and a culture solution supply pipe for supplying the culture solution to the plant on the downstream side of the pump. and a circulating pipe for returning to the culture solution storage tank.

In such a culture solution preparation apparatus, by operating the pump, the main pipe existing upstream is made negative pressure, and by connecting the culture undiluted solution supply pipe to the negative pressure region, the main pipe A culture stock solution can be supplied inside.

Therefore, the upstream side of the undiluted culture solution supply pipe is connected to an undiluted culture solution tank in which the undiluted culture solution is stored, and the undiluted culture solution in the undiluted culture solution tank is sucked by a pump that feeds the undiluted culture solution in the storage tank. It can be a culture undiluted solution supplying device.

In addition, on the downstream side of the pump, a switching valve for switching between the culture solution supply pipe and the circulation pipe is provided, or an on-off valve is provided for each of the culture solution supply pipe and the circulation pipe. can also

At least one of the main pipe and the undiluted culture solution supply pipe may be provided with a valve for regulating the flow rate in the pipe. By adjusting the buff part of the main pipe, the flow rate can be adjusted. For example, if the pump is operated with the main pipe closed, only the undiluted culture solution can be selectively fed. It becomes possible. On the other hand, after the concentration of the culture solution in the culture solution storage tank reaches a desired value, if the pump is operated with the undiluted culture solution supply pipe closed, only the culture solution can be fed. becomes possible.

In addition, in the undiluted culture solution supply device according to the present invention, two or more undiluted culture solution tanks may be provided. That is, a culture solution can be prepared from two or more culture stock solutions. At this time, it is desirable that the culture solution supply pipes are connected to the respective culture undiluted solution tanks, and that the culture solution supply pipes are connected to different locations in the main pipe. Depending on the culture undiluted solution to be used, solid matter may be precipitated by mixing both undiluted solutions. Therefore, in order to avoid precipitation of the solid matter, each culture undiluted solution supply pipe is connected to the main pipe at a separate position. preferably connected.

In order to solve at least one of the above problems, the present invention provides a hydroponics system that supplies a culture solution produced by using the undiluted culture solution supply device according to the present invention. That is, a hydroponic cultivation system for supplying a culture solution to a plant in hydroponic cultivation, comprising: a culture solution preparation unit for preparing the culture solution in a culture solution storage tank; Provided is a hydroponic cultivation system comprising a liquid supply unit for supplying a liquid to a plant, wherein the undiluted culture solution supply device according to the present invention is used as the undiluted culture solution supply unit.

In such a hydroponics system, it is desirable to use a pump for feeding the culture solution in the culture solution storage tank to the plant as the pump for feeding the culture solution in the culture solution preparation unit that prepares the culture solution.

The undiluted culture solution supply device according to the present invention comprises a culture solution storage tank that stores a culture solution and a pump that feeds the culture solution in the culture solution storage tank. Since the culture solution supply pipe for supplying the culture solution and the circulation pipe for returning the culture solution to the culture solution storage tank are provided, the pump absorbs the culture solution in the culture solution storage tank and passes it through the circulation pipe. Agitation of the culture solution can be promoted by returning it to the culture solution storage tank. That is, it is possible to provide a culture solution preparation device and a hydroponics system using the same, which can perform agitation of the culture solution and supply of the culture solution to the plant by one pump.

In addition, the undiluted culture solution supply device according to the present invention includes a pump for feeding a culture solution in a culture solution storage tank, and an undiluted culture solution connected to a main pipe provided between the pump and the culture solution storage tank. A culture solution supply pipe for supplying culture solution to plants and a circulation pipe for returning culture solution to the culture solution storage tank are provided downstream of the pump. A common pump can be used to prepare the culture solution in and supply the culture solution to the culture solution storage tank.

Then, the upstream side of the undiluted culture solution supply pipe is connected to a undiluted culture solution tank in which the undiluted culture solution is stored, and the undiluted culture solution in the undiluted culture solution tank is sucked by a pump that feeds the undiluted culture solution in the storage tank. By doing so, even if the undiluted culture solution tank is installed at a low position, the undiluted culture solution inside can be sucked up by a single pump to prepare the culture solution, and a constant amount of culture solution can be produced regardless of the amount of liquid in the undiluted culture solution tank. A culture solution preparation device capable of supplying a stock solution without providing a separate pump and a hydroponics system using the same can be provided.

Therefore, the undiluted culture solution supply device according to the present invention and the hydroponics system using the same are easy to maintain, can reduce installation costs, and facilitate maintenance during operation. It is possible to provide a culture solution preparation device that can obtain any effect and a hydroponics system using the same.

Especially when the main pipe is provided with a valve that regulates the flow rate in the pipe, by closing the valve, only the undiluted culture solution supplied from the undiluted culture solution supply pipe can be supplied to the culture solution storage tank through the circulation pipe. can be done. In addition, when a culture undiluted solution supply pipe is provided with a valve for regulating the flow rate in the pipe, by closing the valve, the culture solution in the culture solution storage tank can be supplied to the plant at the same concentration. It can be a hydroponics system using.

When two or more culture solution tanks are provided and the culture solution supply pipes are connected to the respective culture solution tanks, by connecting the culture solution supply pipes to different locations in the main pipe, two types of culture solution can be obtained. It is possible to provide a culture solution preparation device capable of avoiding deposition of solids due to mixing of the nutrient solution with the undiluted solution, and a nutrient solution cultivation system using the same.

FIG. 1 is a circuit diagram showing a hydroponic cultivation system when preparing a culture solution in the hydroponic cultivation system according to the first embodiment; FIG. 2 is a circuit diagram showing the hydroponic cultivation system when the culture solution is supplied in the hydroponic cultivation system according to the first embodiment; FIG. 11 is a circuit diagram showing a hydroponic cultivation system when preparing a culture solution in the hydroponic cultivation system according to the second embodiment;

Hereinafter, a solution preparation apparatus using negative pressure and a solution supply system using the same according to the present embodiment will be specifically described with reference to the drawings. In particular, this embodiment shows an example of use for preparing a culture solution in hydroponic culture, and the hydroponic culture system uses the undiluted culture solution supply device according to the present invention as a culture solution preparation unit. .

FIG. 1 is a circuit diagram showing a hydroponics system formed by using the undiluted culture solution supply device according to the first embodiment, and shows the operating state during preparation of the culture solution. The hydroponic cultivation system 10 is used for hydroponic cultivation of agricultural plants, and prepares a culture solution 15 by mixing raw water w stored in a culture solution storage tank 20 with undiluted culture solutions fa and fb. Then, this culture solution 15 is supplied to the medium of the cultivation bed.

Particularly, in the culture solution preparation unit according to this embodiment, the main pipe 25 for feeding the culture solution 15 (or raw water) in the culture solution storage tank 20 is provided between the pump 30 and the culture solution storage tank 20. The undiluted culture solution is supplied by a undiluted culture solution supply pipe 50 connected to the main pipe 25 . The culture solution 15 in the culture solution storage tank 20 is prepared by supplying the culture solution fa and fb guided by the culture solution supply pipe 50 into the raw water transferred through the main pipe 25 by the pump 30, and then using the culture solution for circulation. It can be carried out by refluxing the culture solution storage tank 20 through the pipe 16 .

That is, raw water w, such as well water or tap water, is guided to the culture medium storage tank 20 by a raw water supply path 27 composed of a pipe, and is stored by a float switch 22 in a predetermined amount. The raw water supply path 27 is provided with a water supply valve 28 consisting of a ball valve, a strainer 29 for removing foreign substances mixed in the raw water w, and a water supply electromagnetic valve 21 in this order from the upstream side. The culture fluid storage tank 20 is provided with a level switch 23 for detecting the water level of the raw water w, and is connected to a drain valve 24 for draining the raw water w in the culture fluid storage tank 20 . To this culture medium storage tank 20, a main pipe 25 is connected for transferring the raw water w for preparing the culture medium 15 and the culture medium 15 after adjusting the concentration and the like. The main pipe 25 is provided with a ball valve 26 for turning on/off the supply of liquid from the culture medium storage tank 20, and the culture stock solution in the culture stock solution tank containing the culture stock solution is guided to the downstream side thereof. A culture undiluted solution supply pipe 50 is connected. In particular, since the culture solution 15 is adjusted using two types of undiluted culture solutions fa and fb in this embodiment, the undiluted culture solution tanks 44 (44a and 44b) and the undiluted culture solution supply pipes 50 (50a and 50b) have two of each. Each undiluted culture solution supply pipe 50 is provided at different positions in the main pipe 25 in the flow direction (that is, upstream and downstream). By differentiating the connecting positions of the culture undiluted solution supply pipes 50 in this way, it is possible to avoid deposition of solids due to mixing of the undiluted solutions.

A pump 30 for feeding the liquid in the main pipe 25 is provided downstream of the connecting portion of the undiluted culture solution supply pipe 50 . By operating the pump 30, the raw water in the culture medium storage tank 20 is guided through the main pipe 25, and the inside of the main pipe 25 becomes negative pressure (approximately -0.02 Mpa). As a result, the undiluted culture solutions fa and fb in the undiluted culture solution tanks 44 (44a and 44b) are sucked through the undiluted culture solution supply pipes 50 (50a and 50b) and mixed with the raw water guided through the main pipe 25. Become. The raw water (or the culture solution 15) mixed with the undiluted culture solution passes through the pump 30, passes through the circulation pipe 16 provided downstream of the pump 30, and is returned to the culture solution storage tank 20. be. At this time, since the raw water mixed with the undiluted culture solution is sufficiently stirred while passing through the pump 30 and the circulation pipe 16, it can be returned to the culture solution storage tank 20 as the culture solution 15 having a uniform concentration. .

By repeating the mixing of the undiluted culture solution into the raw water and the circulation of the culture solution to the culture solution storage tank 20 by the pump 30 and the circulation pipe 16 as described above, the concentration of the culture solution 15 in the culture solution storage tank 20 is kept at a predetermined level. can be the value of After the culture solution concentration becomes constant, the culture solution 15 in the culture solution storage tank 20 can be used to supply plants.

FIG. 2 is a circuit diagram showing a hydroponic cultivation system formed using the undiluted culture solution supply device according to the first embodiment, and shows a circuit diagram for supplying the culture solution 15 having a predetermined concentration prepared as described above to plants. operating state.

As shown in FIG. 2, when the culture solution 15 is supplied, the solenoid valves 51a and 51b provided in the culture undiluted solution supply pipe 50 are closed, and the circulation solenoid valve 17 provided in the circulation pipe 16 is closed to operate the pump. 30 is activated. As a result, the culture solution 15 in the culture solution storage tank 20 passes through the main pipe 25, the pump 30, the culture solution supply pipe 18, and is guided to a cultivation bed (not shown) in which plants are grown. The culture solution supply pipe 18 includes a filter 60 for filtering the culture solution 15, a liquid supply electromagnetic valve 65 for opening and closing the culture solution supply pipe 18, and a filter for taking out the supplied culture solution 15. A sample valve 63 is provided.

The hydroponics system 10 according to the present embodiment is provided with a control unit for controlling the concentration, flow rate, etc., when the culture solution 15 is prepared and when the culture solution 15 is supplied. The control section 31 includes an EC (electrical conductivity) adjustment section 32 , a constant pressure control section 33 and a timer control section 33 .

The EC (electrical conductivity) adjustment unit 32 controls the supply of raw water and undiluted culture solutions fa and fb so that the concentration of fertilizer components in the supplied nutrient solution reaches a predetermined target concentration of fertilizer components. That is, the undiluted culture solution supply valve can be controlled based on the value of the level switch 23 and the value (electrical conductivity value) in the electrical conductivity measuring section 41 provided downstream of the pump 30 . Incidentally, the electric conductivity measuring unit 41 may be provided in the culture medium storage tank 20 to measure the electric conductivity value of the culture medium in the tank. However, when the electric conductivity measuring unit 41 is provided downstream of the pump 30, the value immediately after the undiluted culture solution is mixed can be measured, so the concentration of the culture solution can be adjusted quickly and accurately. can be done.

The constant pressure control section can also control the operation of the pump 30 based on the value of the pressure sensor 42 provided downstream of the pump 30 . The pressure sensor 42 is desirably provided upstream of the branched portion of the circulation pipe 16 and the culture medium supply pipe 18 . In the timer control unit, the internal timer controls the opening/closing timing (hour, day, etc.) of the water supply solenoid valve 21, the circulation solenoid valve 17 provided on the circulation pipe 16, and the liquid supply solenoid valve 65 provided on the culture solution supply pipe 18. ) and opening/closing time can be controlled.

Next, referring to FIG. 3, a hydroponics system 10 formed using the undiluted culture solution supply device according to the second embodiment will be described. In particular, FIG. 3 is a circuit diagram showing the operating state when the culture medium 15 is prepared. The hydroponic cultivation system 10 according to this embodiment is configured to directly supply the undiluted culture solution into the culture solution storage tank 20 . That is, the undiluted culture solution supply pipes 50 (50a, 50b) connected to the two undiluted culture solution tanks 44 (44a, 44b) are guided into the culture solution storage tank 20, respectively. Such undiluted culture solutions fa and fb can be supplied by utilizing the height difference between the undiluted culture solution tanks 44 (44a and 44b) and the culture solution storage tank 20. In addition, the culture solution storage tank 20 can be made to have a sealed structure. , by lowering its internal pressure.

The culture solution supply pipe 18 and the circulation pipe 16 are provided on the downstream side of the pump 30 for feeding the main pipe 25 connected to the culture solution storage tank 20, and the circulation pipe 16 is the culture solution. It is connected to the storage tank 20 .

In the hydroponics system configured as described above, when a predetermined amount of raw water is supplied to the culture medium storage tank 20, the corresponding undiluted culture liquid is supplied from the undiluted culture liquid supply pipe 50 into the tank. In this state, it is conceivable that the undiluted culture solution and the undiluted water are not sufficiently mixed in the tank. Therefore, the pump 30 is operated to take out the culture solution 15 in the culture solution storage tank 20 from the main pipe 25, and after sufficiently stirring it with the pump 30 and the circulation pipe 16, it is poured into the culture solution storage tank 20 again. Reflux. As a result, the culture solution 15 in the culture solution storage tank 20 is sufficiently agitated, and the culture solution 15 with a uniform concentration can be supplied to the plants.

Therefore, in the hydroponic cultivation system according to this embodiment, it is possible to agitate the culture solution 15 and supply the culture solution 15 with one pump 30, which not only reduces manufacturing costs but also reduces maintenance work. can be made easier.

The culture undiluted solution supply device for hydroponic cultivation and the hydroponic cultivation system using the same according to the present invention can be used in solution culture facilities, as well as in other facilities such as factories and water supply facilities without being limited to solution culture. , can be used to mix chemical solutions, etc. into the supply raw water.

10 Hydroponics system 15 Culture solution 16 Circulation pipe 17 Circulation solenoid valve 18 Culture solution supply pipe 20 Culture solution storage tank 25 Main pipe 27 Raw water supply channel 30 Pump 31 Control unit 44 Culture solution tank 50 Culture solution supply pipe

Claims (7)

A culture solution preparation device for preparing a culture solution by supplying a culture stock solution to raw water stored in a culture solution storage tank,
It consists of a culture solution storage tank for storing the culture solution and a pump for feeding the culture solution in the culture solution storage tank, and downstream of the pump, a culture solution supply pipe for supplying the culture solution to the plant, and a circulation pipe for returning to the culture solution storage tank.
A culture solution preparation device for preparing a culture solution by supplying a culture stock solution to raw water stored in a culture solution storage tank,
A pump for feeding the culture solution in the culture solution storage tank, and a culture undiluted solution supply pipe connected to a main pipe provided between the pump and the culture solution storage tank,
A culture solution preparation apparatus, wherein a culture solution supply pipe for supplying a culture solution to a plant and a circulation pipe for returning the culture solution to the culture solution storage tank are provided on the downstream side of the pump.
3. The apparatus for preparing culture solution according to claim 2, wherein at least one of the main pipe and the undiluted culture solution supply pipe is provided with a valve for regulating the flow rate in the pipe.
The upstream side of the undiluted culture solution supply pipe is connected to a undiluted culture solution tank in which the undiluted culture solution is stored. 4. The culture fluid preparation device according to claim 2 or 3, which is aspirated.
2. The culture solution supply pipe is connected to each of the culture solution tanks, and the culture solution supply pipes are connected to different locations in the main pipe. 5. The culture medium preparation device according to 4.
A hydroponics system for supplying a culture solution to a plant in hydroponics,
a culture solution preparation unit for preparing the culture solution in the culture solution storage tank;
It consists of a liquid supply unit that supplies the culture solution in the prepared culture solution storage tank to the plant,
A hydroponics system, wherein the undiluted culture solution supply device according to any one of claims 1 to 5 is used as the undiluted culture solution supply unit.
A solution preparation device for preparing a solution by supplying a liquid component such as a chemical solution to raw water supplied to a facility or equipment,
It consists of a solution storage tank that stores a solution mixed with a liquid component and a pump that feeds the solution in the solution storage tank,
A solution preparation apparatus, characterized in that a solution supply pipe for supplying a solution to a facility or equipment and a circulation pipe for returning the solution to the solution storage tank are provided on the downstream side of the pump.

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