JP2543141B2 - Hydroponics culture fluid running water sterilization system - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sterilizing system of a culture solution under flowing water in hydroponics.

In the conventional soil cultivation, the method of adding various effective fungicides to the soil medium is the most common method for sterilizing various pathogenic bacteria of plants that propagate in the soil medium. It is on sale. However, at the time of the release of the fungicide, it is necessary to attach detailed application data for various tests including the effects on humans and animals when eating plants cultivated using the fungicide, and to apply and obtain approval. Generally, it takes a long time to develop, but it has been relatively recent that the cultivation of vegetables and flowers by hydroponic cultivation has become active, and the market size of hydroponic cultivation is still smaller than that of conventional soil cultivation. Therefore, its development has not progressed, and at present, no bactericide for culture solution has been released. Therefore, as an effective sterilization method of the culture solution, heat sterilization or ultraviolet irradiation sterilization of the culture solution is mainly performed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention To sterilize a culture solution by heating, the culture solution that has been heat-sterilized needs to be cooled and used again, which requires a long time for sterilization and is inefficient, and also has a bactericidal effect on thermophilic pathogens. There are drawbacks such as low. Also, ultraviolet sterilization by irradiating the culture solution with ultraviolet rays can obtain a high sterilizing effect in a short time, but among the culture solution tissues by ultraviolet irradiation, nitrogen, phosphate, potassium, magnesium, zinc, manganese, etc. Although the concentrations of most of the elements hardly change, chelated iron in the culture solution is decomposed and precipitated, and the concentration of iron ions in the culture solution decreases. Therefore, iron deficiency (Iron Chl
or erythrocyte), the production of chlorophyll is impaired, and leaf lateralization may occur. Furthermore, currently, no approved germicide has been released, but even if a germicide is licensed and released in the future, the germicide may be essential depending on the frequency and amount of germicide used. It is necessary to pay sufficient attention to the effects on cultivated plants themselves and humans and animals that ate the cultivated plants, which may be caused by residual / accumulation of the toxic substances possessed by the plant, and it is difficult to cultivate truly clean plants.

An object of the present invention is to provide a culture solution running water sterilization system for hydroponic culture that can solve the above problems.

Means for Solving the Problems The present invention, in order to achieve the above objects, a culture solution running water sterilization system for hydroponics that controls the pH of a culture solution containing at least iron ions and sterilizes the culture solution by UV irradiation. It is characterized in that the pH of the culture solution is always in a constant range, preferably 4.0 to 6.0, so that the iron ion concentration of the culture solution is maintained in a range that does not hinder the cultivation of plants. It is a culture solution running water sterilization system for hydroponics.

Operation According to the above configuration, the culture solution for hydroponic culture can be efficiently sterilized in a short time by irradiation of germicidal rays, and chelate iron is decomposed and precipitated by ultraviolet irradiation by appropriately and automatically adjusting the pH of the culture solution. The degree of iron deficiency (Iron Chlorosi
It is possible to cultivate a clean plant that does not cause s), and that does not affect the cultivated plant itself or human livestock that ate the cultivated plant, which may be caused by residual or accumulated toxic substances.

Embodiment An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a hydroponic bed, 2 is an ultraviolet irradiation tank, 3 is an acid solution tank, 4 is an alkaline solution tank, and 5 is
pH sensor, 6 culture medium pH control device, 7 filtration device, 8
Is a culture solution tank. The culture solution stored in the culture solution tank 8 is filtered by the circulation device 9 by the filtration device 7, and then flown into the ultraviolet irradiation tank 2 to obtain 254 nm.
The culture solution is sterilized by irradiation with ultraviolet rays whose main wavelength is
It is sent to the hydroponics bed 1. Further, the pH value of the culture solution flowing through the hydroponic culture bed 1 is determined by the pH sensor 5
When the pH value exceeds 6.0 to 6.0 for a certain period of time, the relay 10 is actuated by the culture medium pH control device 6, and when the pH value is 6.0 or more, the The solution supply pump 11 rotates, and the acid solution tank 3
Acid solution such as sulfuric acid (H ₂ SO ₄ ) from the above hydroponics bed 1
When the pH value of the culture solution fed to the hydroponic culture bed is lowered, and when the pH value becomes 4.0 or less, the alkaline solution supply pump 12 is rotated and the alkaline solution tank 4 moves An alkaline solution such as KOH) or caustic soda (NaOH) is supplied to the hydroponic culture bed, and the pH value of the culture solution flowing through the hydroponic culture bed is always kept in the range of 4.0 to 6.0. .

As shown in FIG. 2, the ultraviolet irradiation tank 2 comprises a running water sterilization tank 2a and a power supply device 2b. A running water inlet 2c is provided on the lower side surface of the running water sterilization tank 2a and a running water outlet is provided on the opposite side surface. 2d is provided. Further, inside the running water sterilization tank 2a, via an inner lid 2e, a single mouth type double tube sterilization lamp 2f and a foaming device 2g incorporating an air pump.
Are arranged. In addition, the double tube germicidal lamp 2f has 254 nm
The sterilizing ray intensity sensor 2h, which is sensitive to the sterilizing ray, is adsorbed and mounted on the suction plate. Further, the double tube germicidal lamp 2f is connected to the power supply device 2b via a socket 2i, and an outer lid 2j is provided as a protective cover for the double tube germicidal lamp 2f and the foaming device 2g, and four side surfaces are provided. It is attached to the running water sterilization tank 2a with the tightening screw 2m from the
2f and foamer 2g maintenance, such as replacement, cleaning, repair, etc., can be performed by removing the tightening screw 2m.
2j can be easily removed and implemented. As for the inner lid 2e, the end surface 4 of the inner lid 2e is also included.
The places are attached to the running water sterilization tank 2a by tightening screws 2n, and by removing the tightening screws 2n, the inner lid 2e can be easily removed to clean the inside of the running water sterilization tank 2a. It is like this.

As shown in FIG. 3, the double tube germicidal lamp 2f has a light emitting tube 3
a, a waterproof outer tube 3b made of UV-transparent glass, a base 3c, and a base 3d, and the double tube germicidal lamp 2f can be easily mounted by a mounting / removing screw 3e provided at the bottom of the base 3d. Can be attached and detached. Further, the base part 3c is of a single base type so that the double tube sterilizing lamp 2f can be easily attached and detached.

As shown in FIG. 4, the power supply device 2 includes blinking switches 4a-1 to 4a-8 of the double tube sterilizing lamp 2f, lighting pilot lamps 4b-1 to 4b-8 indicating whether or not the lamp is lit, and the foaming. A sterilization line strength reduction warning pilot lamp 4d and an earth leakage breaker 4e connected via a relay from the switch 4c of the device 2g and the sterilization line strength sensor 2h are mounted,
When the sterilization line intensity of the double-tube sterilization lamp 2f is reduced to about 70% or less of the initial value, the sterilization line intensity reduction warning pilot lamp 4d is turned on, the sterilization line intensity becomes a predetermined value or less, It warns that the double tube germicidal lamp 2f needs to be replaced with a new one.

As the double-tube sterilization lamp 2f, 8 double-tube sterilization lamps having an ultraviolet output of 1.7 W and a lamp power of 13 W were used, and 35 liters of the culture solution was put in the ultraviolet irradiation tank 2, and tomato blue-green as an indicator bacterium of general bacteria. Pseudomonas solanacearum EFS
mith) and Fusarium oxysporum Schlechtendahl f.sp.cucumerin as an indicator of filamentous fungi
um Owen) at a concentration of 1.0 × 10 ⁴ cells / ml, and after stirring for 10 minutes, UV irradiation with a main wavelength of 254 nm was performed. After UV irradiation, the culture solution was stirred and then the The culture solution was collected from the central part of the irradiation tank 2, and the bactericidal effect against the bacterial wilt of tomato was tested by the dilution plate method, and the bactericidal effect against the cucumber vine fungus was tested by the conidia germination assay. The results are shown in Table 2. From these results, when using 8 double-tube sterilization lamps with an ultraviolet output of 1.7 W and a lamp power of 13 W, when Tomato wilt disease bacteria was taken as an index bacterium of general bacteria, 35 liters of the culture solution within 10 seconds, It can be seen that 35 liters of the culture solution can be sterilized in about 60 seconds in the same manner by taking the cucumber Fusarium wilt as an indicator of filamentous fungi.

In addition, the change in the concentration of iron ions in the culture solution due to ultraviolet irradiation was used as the double-tube sterilization lamp 2f, and 8 double-tube sterilization lamps with an ultraviolet output of 1.7 W and a lamp power of 13 W were used to culture in the ultraviolet irradiation tank 2. Add 35 liters of the solution and irradiate the culture solution with ultraviolet rays, and after each fixed time of 10 minutes, 20 minutes, 30 minutes, 40 minutes, 50 minutes, 60 minutes, collect the culture solution and check the change in iron ion concentration And it becomes like Fig.5. 6 when the pH of the culture is 7.0
After 0 minutes, the iron ion concentration shows a decrease of about 60%,
When the pH value of the culture solution is high, the decrease of iron ion is large, but when the pH value is 5.0, the decrease of iron ion concentration after 60 minutes also remains at about 20% and the pH value is suppressed to around 5. If
Although the iron ion concentration is reduced to some extent, it can be seen that the iron ion concentration is maintained in a range that does not hinder plant cultivation.

Tables 1 and 2 show the bacterial wilt of tomato wilt when using 8 double tube germicidal lamps with the same UV output of 1.7W and lamp power of 13W, and putting 35 liters of culture solution in the UV irradiation tank and irradiating with UV light. And the bactericidal effect against cucumber wilt disease bacteria.

EFFECTS OF THE INVENTION As is clear from the description of the examples, according to the present invention, it is possible to efficiently sterilize a culture solution of hydroponic culture in a short time by irradiation of a germicidal ray, and appropriately and automatically adjust the pH of the culture solution. By doing so, it is possible to suppress the degree of decomposition and precipitation of chelated iron by ultraviolet irradiation to be relatively small,
It is possible to grow clean plants that do not cause iron deficiency (Iron Chlorosis) in cultivated plants, and that does not affect the cultivated plant itself or human livestock that ate the cultivated plant due to residual or accumulated toxic substances. It will be.

[Brief description of drawings]

FIG. 1 is a block diagram of a culture solution running water sterilization system for hydroponics according to an embodiment of the present invention, and FIG. 2 is a configuration diagram of an ultraviolet irradiation tank constituting the culture solution running water sterilization system for hydroponics, and FIG.
The figure shows the structure of the double-tube sterilization lamp installed in the running water sterilization tank that constitutes the UV irradiation tank, Fig. 4 shows the external view of the power supply device that also constitutes the UV irradiation tank, and Fig. 5 shows the UV output of 1.7W. FIG. 8 is a diagram showing the degree of change in iron ion concentration in the culture solution when using eight double-tube sterilization lamps with a lamp power of 13 W, putting 35 liters of the culture solution in the ultraviolet irradiation tank, and irradiating with ultraviolet rays. 1 ... Hydroponics bed, 2 ... UV irradiation tank, 3 ...
… Acid solution tank, 4 …… Alkaline solution tank, 5 …… pH
Sensor, 6 ... Culture liquid pH control device, 7 ... Filtration device,
8 ... Culture solution tank, 2a ... Streaming water sterilization tank, 2b ... Power supply device, 2c ... Streaming water inlet, 2d ... Streaming water outlet, 2f ... Double tube sterilization lamp, 3a ... Arc tube, 3b .... Waterproof outer tube made of UV-transparent glass, 3c ... Mouth, 4a-1 to 4a-9 ...
… Blinking switch, 4b-1 to 4b-9 …… Lighting pilot lamp, 4d …… Disinfection line strength warning warning pilot lamp.

Claims (3)

(57) [Claims] 1. A culture solution running water sterilization system for hydroponic culture, which controls the pH of a culture solution containing at least iron ions and sterilizes the culture solution with running water by ultraviolet irradiation.
Culture liquid running water sterilization of hydroponic culture characterized in that the pH of the culture liquid is always automatically adjusted to a constant range so as to keep the iron ion concentration of the culture liquid in a range that does not hinder plant cultivation. system. 2. The culture solution running water sterilization system for hydroponics according to claim 1, wherein the predetermined range is 4.0 to 6.0. 3. A culture solution running water sterilization system for hydroponic culture, which controls the pH of a culture solution containing at least iron ions and sterilizes the culture solution with running water by UV irradiation.
The pH of the culture solution is always automatically adjusted to a constant range so as to keep the ferric ion concentration of the culture solution in a range that does not hinder the cultivation of plants, and an air outlet is provided inside the ultraviolet irradiation tank. Provided, by blowing air into a sterilizing lamp by blowing air, while stirring the culture solution so that the sterilized culture solution does not stagnate near the sterilization lamp, it is possible to impregnate air into the culture solution. A feature of the culture fluid running water sterilization system for hydroponics.