JP3396686B2 - Drainage sterilizer and liquid supply system for plant cultivation - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an effluent sterilizing device that makes it possible to use the effluent of a liquid supply liquid supplied to a cultivation bed, and a plant cultivation liquid supply system including the device.

[0002]

2. Description of the Related Art As a liquid supply system capable of utilizing drainage, the one shown in FIG. 3 is known. That is, a tank 100 that is connected to a supply source of each nutrient solution such as raw water or liquid fertilizer, and that can mix the nutrient solutions and supply the liquid supply liquid to a liquid supply unit (not shown) for the cultivation bed 110, Cultivation bed 1
10, a drainage pipe 120 into which the drainage of the liquid for liquid supply that has not been consumed in the cultivation bed 110 flows, a branch pipe 130 connected to the drainage pipe 120 and flowing into the tank 100, First liquid supply pipe 140 and second liquid supply pipe 150 connected to tank 100, tank 10
0 and the cultivation bed 110, the third liquid supply pipe 160, the first and second liquid supply pipes 140, 150
The liquid for liquid supply and the liquid drain that have flowed into the tank 100 via the third liquid supply pipe 160
A pump 170 for supplying 0 to the tank 100 and a front stage of the tank 100, and a drainage sterilizer 190 disposed in the middle of the branch pipe 130 are provided.

According to this liquid supply system, first, the raw water is supplied to the tank 100 from the raw water supply source, and liquid fertilizer tanks 100a and 100b which are the liquid fertilizer supply sources.
The valves 180a and 180b are opened to supply several types of liquid fertilizer, which are mixed in the tank 100 to generate a liquid for liquid supply having a predetermined fertilizer balance (composition) and concentration. Next, the valve 180c is opened, the pump 170 is started, and the liquid for liquid supply is supplied to the cultivation bed 110. In the cultivation bed 110, a predetermined amount of the liquid supply liquid is consumed due to absorption of the liquid supply liquid by the plant, absorption of the liquid supply liquid by the medium, and accompanying evaporation from the plant or the medium, The liquid to be supplied that has not been collected is collected as drainage in the lower part of the cultivation bed 110. At this time, if the valve 180d is opened and the valve 180e is closed, the collected drainage liquid passes through the drainage pipe 120 and the branch pipe 130, and the tank 1
00 collected and stored.

If the amount of drainage stored in the tank 100 is small, raw water is replenished and the liquid level sensor 100c detects the liquid level so that the amount of liquid in the tank 100 does not exceed a predetermined amount. The opening / closing of the valves 180a and 180b is controlled, and the cultivation bed 110 is supplied with liquid at appropriate timing. In addition, when the amount of liquid in the tank 100 has reached a predetermined amount, even if the drainage is collected from the cultivation bed 110,
The liquid amount is adjusted by opening the valve 180e and discharging it without storing it in the tank 100.

[0005]

By the way, the effluent discharged from the cultivation bed 110 contains appropriate germs. For this reason, when using the drainage, as shown in FIG. 3, the drainage sterilizer 190 is provided in the preceding stage of the tank 100.

However, since the drainage flows through the drainage pipe 120 and the branch pipe 130, which are the flow paths, without interruption, sterilization tends to be insufficient. Further, since a considerable amount of drainage flows in proportion to the supplied amount of liquid, a large-sized and high-performance drainage sterilizer is required to sterilize this. In fact, conventionally used drainage sterilizers are large and expensive. In addition, the flow rate of the drainage liquid to be sterilized may be small with the increase or decrease of the liquid supply amount, but it is equipped with a large and high-performance drainage sterilizer so that it can handle a large amount of drainage liquid. In such a case, the device cannot be effectively used when the drainage flow rate is small.

On the other hand, as a comparatively inexpensive and small-sized drainage sterilizer, it is constituted by an ozone generator and an air diffuser for discharging the ozone produced by this device into the drainage. Some sterilize it. However, in such a drainage sterilizer, a sufficient amount of ozone cannot be obtained from the diffuser by discharging a small amount of ozone from the diffuser. Is being discharged into the drainage through. Although ozone has a strong bactericidal action, when it is used in a large amount, it is feared that it may have an adverse effect on the crop and the culture medium environment, and may also have an adverse effect on the human body.
There is also a problem that the cost is high because a large amount of ozone is generated by the ozone generator.

Further, since the amount of drainage flowing into the tank 100 is not constant, the concentration of the liquid supply liquid actually supplied to the cultivation bed 110 is measured by measuring the concentration in the tank 100. In addition, the amount of liquid fertilizer supplied from the liquid fertilizer tanks 100a and 100b is controlled and prepared. Depending on the condition of the crop, the time of liquid supply, etc., it may be desirable to actively increase or decrease the amount of drainage used or the mixing ratio, but in the conventional liquid supply system shown in FIG. As described above, it is difficult to actively control the amount of drainage used or the mixing ratio.

The present invention has been made in view of the above circumstances, and employs a drainage sterilizer that uses inexpensive and small ozone, and sterilizes the drainage more reliably than before with a small amount of ozone. It is an object of the present invention to provide a drainage sterilizer capable of performing the above and a liquid supply system for plant cultivation including the device. It is another object of the present invention to provide a liquid supply system for plant cultivation, which can positively control the amount of waste liquid used or the mixing ratio.

[0010]

In order to solve the above-mentioned problems, the drainage sterilizer of the present invention according to claim 1 is an inflow pipe for introducing the drainage discharged from the cultivation bed and a sterilized drainage. A drainage sterilizer having a sterilization tank additionally provided with an outflow pipe for flowing out to a liquid supply unit, wherein the ozone generator and the ozone generator are connected to the ozone generator through a pipe, and are provided at the bottom of the sterilization tank. And an air diffuser that is placed in the sterilization tank, and sucks ozone discharged from the air diffuser, and further makes the bubbles of the ozone finer by a stirring blade and mixes with the waste liquid that has flowed into the sterilization tank. A submersible pump for discharging from a discharge port, and a liquid containing ozone discharged from the discharge port of the submersible pump, which is connected to the discharge port of the submersible pump and has a narrowed diameter part in the middle, Press at the throttle It allows characterized by comprising a diffusible ozone discharge pipe ozone which has passed through the the narrowed portion to the sterilization bath.

The drainage sterilizer of the present invention according to claim 2 is
The drainage sterilizer according to claim 1, wherein the discharge port of the ozone discharge pipe is provided near the bottom of the sterilization tank so as to open downward.

According to a third aspect of the present invention, there is provided a plant cultivation liquid supply system, wherein a drainage stock tank for storing drainage discharged from a cultivation bed and a sterilization tank for receiving the drainage sent from the drainage stock tank. And a drainage sterilizer for sterilizing the effluent in the sterilization tank, and a liquid supply tank for receiving the sterilized effluent flowing out from the effluent sterilizer, and including the sterilized effluent A liquid supply system for plant cultivation, comprising a liquid supply unit for supplying a liquid to the cultivation bed as a liquid supply liquid, wherein the drainage sterilizer is an ozone generator and a pipe to the ozone generator. Connected to the sterilization tank and an air diffuser provided at the bottom of the sterilization tank, and the ozone discharged from the air diffuser arranged in the sterilization tank is sucked in and the bubbles of the ozone are further fined by a stirring blade. The submersible pump that mixes with the waste liquid that has flowed into the sterilization tank and discharges from the discharge port, and the discharge port of the submersible pump that is connected to the discharge port of the submersible pump and has a narrowed diameter part in the middle It is characterized by comprising an ozone discharge pipe capable of diffusing ozone passing through the throttle into the sterilization tank by pressurizing the liquid containing ozone discharged from the outlet in the throttle. And

A liquid supply system for plant cultivation according to a fourth aspect of the present invention is the liquid supply system for plant cultivation according to the third aspect, wherein the liquid supply system between the liquid supply tank and the drainage sterilizer is already sterilized. Is provided with a supply amount adjusting means capable of arbitrarily adjusting the amount of liquid discharged.

According to a fifth aspect of the present invention, there is provided a plant cultivation liquid supply system according to the third or fourth aspect, wherein the plant cultivation liquid supply system is provided between the cultivation bed and the drainage stock tank. The drainage discharged from the bed can be stored separately according to a predetermined system, and a drainage amount measuring tank for supplying the drainage to the drainage stock tank after the drainage amount is measured is disposed interveningly. It is characterized by

The liquid supply system for plant cultivation of the present invention according to claim 6 is the liquid supply system for plant cultivation according to any one of claims 3 to 5, wherein the liquid supply tank supplies raw water. It is characterized in that it is connected to at least one of a source and a source of unused liquid fertilizer, and that at least one of raw water and unused liquid fertilizer can be mixed with the sterilized drainage.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below in more detail based on the embodiments shown in the drawings. FIG. 1 is a schematic configuration diagram showing a plant cultivation liquid supply system according to an embodiment of the present invention. As shown in this figure, this plant cultivation liquid supply system supplies a cultivation bed 6. A liquid supply unit 1 for generating a liquid for liquid supply, a liquid discharge amount measuring tank 2 forming a liquid discharge storage unit, a liquid stock tank 3, and a liquid drainage sterilizer 4 are provided.

In the liquid supply unit 1, raw water sent from a raw water supply source can flow in, and a suitable liquid fertilizer can flow in from several liquid fertilizer tanks 1b and 1c.
By mixing the raw water and the liquid fertilizer at a predetermined ratio, a liquid for liquid supply having a desired concentration and composition is generated. The liquid supply unit 1 is also configured such that sterilized drainage sent from a drainage sterilizer 4 to be described later can flow into the liquid feed tank 1a, and raw water and / or liquid fertilizer and sterilized drainage are provided. It is possible to mix the liquid with a predetermined ratio, and it is possible to generate a liquid for liquid supply having a desired concentration and composition.

The term "liquid for liquid supply" as used herein means a liquid that is once stored in the liquid supply tank 1a and is actually supplied to the cultivation bed 6, and thus raw water and liquid fertilizer are mixed together. Of course, it may include only raw water or liquid fertilizer in some cases. In addition, a mixture of an unused nutrient solution such as raw water and / or liquid fertilizer with a sterilized drainage solution may be the “liquid for liquid supply”. In addition, raw water supply source and liquid fertilizer tank 1
b and 1c correspond to the unused nutrient solution supply source in this specification.

In the liquid supply tank 1a, a spraying device (not shown) provided above the cultivation bed 6 to be supplied with liquid, or a spraying pipe arranged on or in the medium constituting the cultivation bed 6 ( A liquid supply pipe 1d for supplying a liquid for liquid supply is connected to (not shown). It should be noted that the spraying device and the spraying pipe constitute the “liquid supply section” in the present specification.

The cultivating bed 6 is provided with a drain portion (not shown) at an appropriate position, usually at the bottom, along the longitudinal direction of the cultivating bed 6, and the drain portion collects the drainage at a location where the drainage is collected. One end of the liquid pipe 7 is connected to the other end,
A drainage amount measuring tank 2 that stores the drainage liquid is connected.

The drainage amount measuring tank 2 is a plurality of tanks (first to third tanks 2a to 2c) capable of storing drainage.
The drainage discharged from each of the cultivating beds 6 arranged in a plurality of rows can be separately stored in the rows of the cultivating beds 6 through the drain pipe 7 according to the different systems. ing. The first to third tanks 2a to 2c constituting the drainage amount measuring tank 2 are respectively provided with liquid level sensors 2d to 2d.
2f is provided so that the stored liquid amount (drainage amount) of the drainage stored in each row of the cultivation beds 6 can be measured.

Further, the first to third tanks 2a to 2c are provided with discharge means for discharging the supplied waste liquid as it is when the waste liquid is not reused. In the present embodiment, this draining means is used as the drainage amount measuring tank 2 (2a to 2a).
c) and a drainage stock tank 3 to be described later, a switching valve 8a disposed in the middle of the connecting pipe 8,
One end is connected to the switching valve 8a and the other end is composed of a discharge pipe 8b provided so as to be discharged to an appropriate wastewater treatment site, but it is not limited to this. is there.

Further, in the present embodiment, three tanks are installed as the drainage amount measuring tank 2, and the connecting pipe 8, the switching valve 8a and the like are also provided in each tank, but for each row of the cultivation beds 6, that is, When the drainage amount is not measured for each system, it is sufficient to ensure a capacity commensurate with the drainage amount flowing into the drainage amount measuring tank 2, and the number is not limited to three.

The connecting pipe 8 has a drainage measuring tank 2 (2a).
2 c) is provided with a pump 8c for supplying the drainage stock tank 3 with the drainage stored therein, a check valve 8d for preventing backflow, and further impurities such as sludge contained in the drainage. Is provided with a filter 8e.

As described above, the drainage stock tank 3 is provided with the drainage amount measuring tanks 2 (2a-2) via the connecting pipe 8.
c), and by the liquid level sensors 2d-2f,
When it is detected that the amount of drainage in the drainage measurement tank 2 (2a to 2c) has reached a predetermined amount, the pump 8c operates and drainage flows into the drainage stock tank 3. If the drainage amount for each system is not measured, the drainage stock tank 3 may be configured to directly store the drainage liquid from the cultivation bed 6. One end of an inflow pipe 9 is connected to the drainage stock tank 3, and a drainage sterilizer 4 is connected to the other end of the inflow pipe 9. In addition, a pump 9a is interposed in the inflow pipe 9.

The drainage sterilizer 4 comprises a sterilization tank 4a provided with the above-mentioned inflow pipe 9 and an outflow pipe 10 for flowing the sterilized drainage liquid to the liquid supply unit 1, and this sterilization tank 4a is provided.
In a, the effluent discharged from the cultivation bed 6 via the effluent amount measurement tank 2 and the effluent stock tank 3 is sterilized.

Specifically, this drainage sterilizer 4 is shown in FIG.
As shown in FIG. 5, the sterilization tank 4a, the ozone generator 4b, the air diffuser 4c, the submersible pump 4d, and the ozone discharge pipe 4e are provided. The ozone generated by the ozone generator 4b attached to the sterilization tank 4a is the ozone generated by the ozone generator 4b.
b is connected via a pipe 4f and is discharged from an air diffuser 4c provided at the bottom of the sterilization tank 4a. Submersible pump 4d
Is arranged in the sterilization tank 4a so that ozone discharged from the air diffuser 4c can be sucked. Then, the bubbles of ozone discharged from the air diffusing pipe 4c are further finely divided by the stirring blade 4g, mixed with the waste liquid flowing into the sterilization tank 4a, and discharged from the discharge port 4h.
Discharge from.

An ozone discharge pipe 4e is connected to a discharge port 4h of the submersible pump 4d through a pump connecting pipe 4k. The discharge port 4i of the ozone discharge pipe 4e is provided in the sterilization tank 4
In order for ozone to spread throughout the drainage flowing into a,
It is provided near the bottom of the sterilization tank 4a so as to open downward. This ozone discharge pipe 4e is also used in the sterilization tank 4
In order to promote the diffusion of ozone in a, there is a narrowed narrowed portion 4j in the middle, and a discharge port 4h of the submersible pump 4d.
By pressurizing the liquid containing ozone discharged from the diaphragm 4j, the ozone having passed through the diaphragm 4j is diffused into the sterilization tank 4a.

The waste liquid flowing into the sterilization tank 4a through the inflow pipe 9 is discharged from the discharge port 4i of the ozone discharge pipe 4e as described above, sterilized by the ozone diffused in the sterilization tank 4a, and then discharged. It is supplied to the liquid supply tank 1a of the liquid supply unit 1 through the pipe 10. In the present embodiment, the outflow pipe 10 is provided so as to branch from the pump connection pipe 4k and the ozone discharge pipe 4e as shown in FIG. 2, and the outflow pipe 10, the pump connection pipe 4k and the ozone discharge pipe 4k are provided. A three-way switching valve 5 is arranged at the connection with the pipe 4e.

When sterilizing the drainage, the three-way switching valve 5 closes the outflow pipe 10 side and opens the ozone discharge pipe 4e side. As a result, the liquid containing ozone, which is pumped by the submersible pump 4d, is diffused and discharged from the discharge port 4i of the ozone discharge pipe 4e into the sterilization tank 4a. On the other hand, when receiving a liquid supply signal from a control device (not shown), the outflow pipe 10 side is opened and the ozone discharge pipe 4e side is closed. Then, the sterilized waste liquid in the sterilization tank 4a flows into the outflow pipe 10 by the submersible pump 4d and is supplied to the liquid supply tank 1a of the liquid supply unit 1. Therefore, by controlling the operation of the submersible pump 4d, it is possible to arbitrarily adjust the liquid supply amount of the sterilized drainage liquid to the liquid supply tank 1a. The liquid transfer amount is set by the liquid level sensors 2d to 2 of the drainage amount measuring tank 2 (2a to 2c).
It can be appropriately set depending on the drainage amount from the cultivation bed 6 detected by f, the growth stage of the crop, the composition of the liquid for liquid supply, and the like. Then, the control device controls the operation of the submersible pump 4d based on the set liquid delivery amount.

A timer sets the ozone generation time by the ozone generator 4b and the operation time of the submersible pump 4d, that is, the time required to sterilize the drainage, depending on the amount of drainage to be sterilized and the bacteria to be sterilized. can do.

In the present embodiment, the submersible pump 4d, which is activated by receiving an electric signal from the control device, functions as a supply amount adjusting means capable of arbitrarily adjusting the amount of sterilized waste liquid sent. The supply amount adjusting means is disposed between the liquid supply tank 1a and the drainage sterilizer 4, and adjusts the amount of sterilized drainage supplied to the liquid feed tank 1a based on the set liquid feed amount. Anything can be used as long as it can be obtained. For example, it can be configured by a flow control valve or the like, or can be configured by combining a flow control valve and a pump.

Next, the operation of the liquid supply system for plant cultivation according to the present embodiment will be described. First, in the liquid supply unit 1, the liquid supply liquid that is actually supplied to the cultivation bed 6 is generated. Assuming that there is no return of drainage at the time of first supplying liquid, first, raw water and any liquid fertilizer are supplied from the raw water supply source that is a supply source of unused nutrient solution and the liquid fertilizer tanks 1b and 1c. It is supplied and mixed in the liquid supply tank 1a at a predetermined composition ratio and concentration. In this way, when the liquid supply liquid is generated, the liquid supply liquid is sent out to the liquid supply pipe 1d by the pump 1e, and is supplied to the cultivation bed 6 through a spray device or a spray pipe (not shown) that constitutes the liquid supply unit. In the cultivation bed 6, the supplied liquid for liquid supply is absorbed or evaporated by the cultivated crops and the culture medium, and is consumed by a predetermined amount. Then, the unconsumed liquid for liquid supply is discharged from the cultivation bed 6 as drainage, and is given to the first to third tanks 2a to 2c constituting the drainage amount measurement tank 2 via the drainage pipe 7. It is collected according to the system.

The liquid level sensors 2d-2 indicate that the amount of drainage liquid in the first to third tanks 2a-2c has reached a predetermined amount or more.
When f is detected, the pump 8c is activated to supply the drainage in the first to third tanks 2a to 2c into the drainage stock tank 3 through the connecting pipe 8. In the present embodiment, in order to efficiently perform the sterilization process of the drainage by the one drainage sterilizer 4, the drainage temporarily stored in the plurality of tanks 2a to 2c in this way is treated as one drainage. The stock tank 3 is configured to store them collectively.

In the drainage stock tank 3, the drainages respectively supplied from the first to third tanks 2a to 2c are stored one after another. However, when the stored amount of the drainage stock tank 3 reaches a predetermined amount, the drainage stock tank 3 is further fed from the first to third tanks 2a to 2c so as not to exceed the predetermined amount. The surplus draining liquid that comes in is provided with a switching valve 8 arranged in the middle of the connecting pipe 8.
It is discharged through a discharge means composed of a and a discharge pipe 8b connected thereto. On the other hand, drainage stock tank 3
The internal drainage flows from the drainage stock tank 3 through the inflow pipe 9 into the sterilization tank 4a of the drainage sterilizer 4 until it becomes constant by the pump 9a.

In the drainage sterilizer 4, the ozone generator 4b is used.
Ozone is generated by the
It is discharged from the air diffuser 4c provided at the bottom of the sterilization tank 4a via f. The ozone discharged from the air diffuser 4c is
The water is sucked by the submersible pump 4d and the submersible pump 4
Fine bubbles are formed by the stirring blade 4g provided in d,
It is mixed with the drainage flowing into the sterilization tank 4a and discharged from the discharge port 4h of the submersible pump 4d. In this way, the air diffuser 4c
Since the bubbles of ozone discharged from the device are made into fine bubbles by the stirring blade 4g, the ozone easily comes into contact with the object to be sterilized, and the sterilizing action of ozone can be enhanced.

The liquid containing ozone discharged from the discharge port 4h of the submersible pump 4d is discharged through the pump connection pipe 4k from the discharge port 4i of the ozone discharge pipe 4e into the drainage flowing into the sterilization tank 4a. To be done. At this time, since the discharge port 4i of the ozone discharge pipe 4e is provided so as to open downward near the bottom of the sterilization tank 4a, the liquid containing ozone discharged from the discharge port 4i is stored in the sterilization tank 4a. Cycle with
Ozone in the liquid well spreads over the entire drainage liquid in the sterilization tank 4a. Further, since the ozone discharge pipe 4e has the narrowed diameter narrowed portion 4j, the liquid containing ozone flowing in the ozone discharge pipe 4e is pressurized in the narrowed portion 4j and discharged from the discharge port 4i. Since it is discharged, ozone diffuses into the drainage in the sterilization tank 4a, and the drainage can be efficiently sterilized.

Therefore, according to the drainage sterilizer 4, ozone bubbles discharged from the air diffuser 4c can be made finer by the stirring blades 4g of the submersible pump 4d, and the ozone that has passed through the throttle 4j is sterilized. By providing the ozone discharge pipe 4e capable of diffusing into the tank 4a, the sterilization tank 4
Even if the amount of ozone fed into a is small, the ozone easily comes into contact with the substance to be sterilized and diffuses into the effluent in the sterilization tank 4a to sufficiently sterilize various bacteria in the effluent. can do. In addition, the discharge port 4i is connected to the sterilization tank 4a.
Since the ozone is provided so as to open downward toward the bottom of the container, the ozone can be well distributed to the entire drainage liquid in the sterilization tank 4a, so that the sterilization action by ozone can be further enhanced, and efficient sterilization can be performed. It becomes possible to perform processing.

The drainage sterilized by the drainage sterilizer 4 is temporarily stored in the sterilization tank 4a. Then, by receiving a liquid supply signal from a control device (not shown), the three-way switching valve 5 opens the side of the outflow pipe 10, and the ozone discharge pipe 4e.
Close the side. At the same time, the submersible pump 4d as the supply amount adjusting means is activated, and in the sterilization tank 4a,
The sterilized effluent that has been temporarily stored flows into the outflow pipe 10, and a predetermined amount is supplied to the liquid supply tank 1a of the liquid supply unit 1.

In the liquid supply tank 1a, raw water and an arbitrary liquid fertilizer (unused nutrient solution) are supplied at a predetermined composition ratio and concentration from a raw water supply source which is a source of unused nutrient solution and liquid fertilizer tanks 1b and 1c. Supplied. As a result, the sterilized effluent and the unused nutrient solution are mixed, but according to the present embodiment, the mixed amount of the sterilized effluent can be adjusted depending on the condition of the crop, the feeding time, and the like. In addition, it can be positively controlled by the supply amount adjusting means constituted by the submersible pump 4d controlled by the control device. Therefore, if necessary, it is possible to use a liquid that does not mix sterilized drainage liquid at all as a new liquid feed liquid, or this new liquid feed liquid may be composed entirely of sterilized drainage liquid. it can.

When a new liquid supply liquid is generated in this way, the liquid supply liquid is supplied to the liquid supply pipe 1 by the pump 1e.
It is sent to d and supplied to the cultivation bed 6 through a spraying device and a spraying pipe (not shown). The above-mentioned drainage sterilizer 4
The ozone used for sterilizing the waste liquid has the property of chemically changing to oxygen in a relatively short time of about tens of minutes, and the amount of ozone used is small. Ozone in the sterilized effluent contained in the liquid is almost entirely converted to oxygen before being supplied from the effluent sterilizer 4 to the cultivation bed 6 via the liquid supply unit 1. Therefore, the amount of oxygen in the liquid for supply increases,
It is also effective in supplying the oxygen required for crops.

In the cultivation bed 6, the supplied liquid for liquid supply is absorbed by the cultivated crop or the medium, or
It evaporates and is consumed in a predetermined amount. Then, the unconsumed liquid for liquid supply is again discharged as drainage from the cultivation bed 6, collected in the drainage amount measuring tank 2, and the above-described processing is repeated.

[0043]

According to the drainage sterilizer of the present invention as set forth in claim 1, an ozone generator, and an air diffuser connected to the ozone generator through a pipe and provided at the bottom of the sterilization tank, It is placed in the sterilization tank, sucks the ozone discharged from the air diffuser, and makes the bubbles of the ozone finer by a stirring blade, mixes it with the waste liquid flowing into the sterilization tank, and discharges it from the discharge port. Which is connected to the submersible pump and the discharge port of the submersible pump, has a narrow diameter part in the middle, and pressurizes the liquid containing ozone discharged from the discharge port of the submersible pump in the restriction part. By
The ozone discharge pipe is capable of diffusing ozone that has passed through the narrowed portion into the sterilization tank. Therefore, even if a large amount of ozone is not used as in the conventional case, the bubbles of ozone discharged from the air diffuser pipe by the stirring blades of the submersible pump are made fine so that the ozone can easily come into contact with the substance to be sterilized in the discharged liquid. In addition, since the liquid containing ozone is pressurized by the throttle part of the ozone discharge pipe and discharged from the discharge port, ozone can be diffused into the drainage liquid in the sterilization tank, so a small amount of ozone can be used. The effluent can be sterilized. In addition, the ozone generator generates a small amount of ozone, so that the cost can be reduced.

According to the second aspect of the drainage sterilizer of the present invention, the discharge port of the ozone discharge pipe is provided so as to open downward near the bottom of the sterilization tank. Therefore,
Since the liquid containing ozone can be circulated in the sterilization tank and the ozone can be spread over the entire drainage liquid, the drainage liquid can be more reliably sterilized.

According to the liquid supply system for plant cultivation of the third aspect of the present invention, the drainage stock tank for storing the drainage discharged from the cultivation bed and the drainage sent from the drainage stock tank are received. This sterilized waste liquid has a sterilization tank, has a waste liquid sterilizer for sterilizing waste liquid in the sterilization tank, and a liquid supply tank for receiving sterilized waste liquid flowing out from the waste liquid sterilizer. A liquid supply unit for supplying a liquid containing liquid as a liquid supply liquid to the cultivation bed, and the drainage sterilizer is connected to the ozone generator and a pipe to the ozone generator, An air diffuser provided at the bottom of the sterilization tank, which is arranged in the sterilization tank, sucks ozone discharged from the air diffuser, and makes the bubbles of the ozone finer by a stirring blade, and then flows into the sterilization tank. Ozone discharged from the discharge port of the submersible pump, which is mixed with the drainage liquid and is discharged from the discharge port, and which is connected to the discharge port of the submersible pump and has a narrowed portion having a small diameter in the middle thereof. An ozone discharge pipe capable of diffusing ozone that has passed through the narrowed portion into the sterilization tank by pressurizing a liquid containing the liquid in the narrowed portion. Therefore, since the drainage discharged from the cultivation bed is temporarily stored in the drainage stock tank, the amount of drainage supplied from this drainage stock tank to the drainage sterilizer can be controlled to a certain amount or less. It is not necessary to use a large sterilizer to deal with the case where a large amount of drainage flows, as in the above, but a drainage sterilizer using ozone that is relatively inexpensive and small in proportion to the flow rate is used. be able to. Further, the waste liquid can be surely sterilized with a small amount of ozone without using a large amount of ozone as in the conventional case, and further, a small amount of ozone generated by the ozone generator suffices, thus reducing the cost. It is also possible.

According to the liquid supply system for plant cultivation of the fourth aspect of the present invention, the liquid supply between the liquid supply tank and the drainage sterilizer can be adjusted as desired. A quantity adjusting means is provided. Therefore, it is possible to positively control the amount of drainage used or the mixing ratio with the raw water and / or liquid fertilizer according to the condition of the crop and the like.

According to the liquid supply system for plant cultivation of the fifth aspect of the present invention, the drainage discharged from each bed is separately stored between the cultivation bed and the drainage stock tank by a predetermined system. A drainage amount measuring tank for supplying the drainage liquid to the drainage stock tank after the measurement of the drainage amount is provided. Therefore, in the case where the cultivation beds are installed in multiple rows in the greenhouse, the drainage amount can be measured for each row by installing the drainage measurement tank corresponding to each row, for example. .

According to the liquid supply system for plant cultivation of the sixth aspect of the present invention, the liquid supply tank is connected to at least one of a source of raw water and a source of unused liquid fertilizer,
Since at least one of raw water and unused liquid fertilizer can be mixed with the sterilized effluent, raw water and / or liquid fertilizer and sterilized effluent can be mixed at a predetermined ratio, which is desirable. It is possible to generate a liquid for supply having a concentration and a composition.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a liquid supply system for plant cultivation according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a drainage sterilizer according to an embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a conventional plant cultivation liquid supply system.

[Explanation of symbols]

1 Liquid supply unit 1a Liquid supply tank 1b, 1c Liquid fertilizer tank 2 Drainage volume measurement tank 3 drainage stock tank 4 drainage sterilizer 4a Sterilization tank 4b Ozone generator 4c Air diffuser 4d submersible pump 4e ozone discharge pipe 4g stirring blade 4j throttle 4k pump connection pipe 5 three-way switching valve 6 cultivation beds 7 drainage pipe 8 connecting pipes 9 Inflow pipe 10 Outflow pipe

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI C02F 1/50 531 C02F 1/50 531R 540 540A 550 550C (72) Inventor Makoto Kuroki 262-10 Shiba, Kokubunji-cho, Shimotsuga-gun, Tochigi Prefecture Ceremony Company Seiwa Koganei Plant (72) Inventor Kazuya Ishibashi 262-10 Shiba, Kokubunji-cho, Shimotsuga-gun, Tochigi Prefecture Company Seiwa Koganei Plant (72) Inventor Akira Tomigawa 530 Kawakita, Ureshino-cho, Mie Prefecture Mie Prefecture Science Technology Promotion Center Agricultural Technology Center (72) Inventor Katsutoshi Kuroda 530 Kawakita, Ureshino-cho, Isshi-gun, Mie Prefecture Mie Prefectural Science Technology Promotion Center Agricultural Technology Center (72) Inventor Iso ▲ Masaki Hideshi, Mie Prefecture 530 Kawakita, Ureshinocho Mie Prefectural Science and Technology Promotion Center, Agricultural Technology Center (56) Reference JP-A-5-336856 (J , A) JP Akira 64-47324 (JP, A) JP flat 4-310287 (JP, A) JitsuHiraku flat 3-91755 (JP, U) (58 ) investigated the field (Int.Cl. ^7, DB Name) A01G 31/00 601 B01F 5/02 B01F 5/12 C02F 1/50 531 C02F 1/78

Claims (6)

(57) [Claims] 1. A drainage sterilizer having a sterilization tank provided with an inflow pipe for introducing drainage discharged from a cultivation bed and an outflow pipe for flowing out sterilized drainage to a liquid supply unit, An ozone generator, connected to the ozone generator via a pipe, an air diffuser provided at the bottom of the sterilization tank, and arranged in the sterilization tank, while inhaling ozone discharged from the air diffuser, The ozone bubbles are further fined by a stirring blade, mixed with the waste liquid that has flowed into the sterilization tank, and is discharged from the discharge port, and is connected to the discharge port of the submersible pump and has a diameter of halfway. An ozone discharge tube having a narrow throttle portion and capable of diffusing ozone passing through the throttle portion into a sterilization tank by pressurizing a liquid containing ozone discharged from the discharge port of the submersible pump in the throttle portion. And Drainage sterilizer, characterized by. 2. The drainage sterilizer according to claim 1,
The drainage sterilizer according to claim 1, wherein the discharge port of the ozone discharge pipe is provided near the bottom of the sterilization tank so as to open downward. 3. A drainage stock tank for storing the drainage discharged from the cultivation bed, and a sterilization tank for receiving the drainage sent from the drainage stock tank, wherein the drainage is sterilized. A drainage sterilizer and a feed tank for receiving sterilized drainage flowing out from the drainage sterilizer, and a liquid containing the sterilized drainage supplied to the cultivation bed as a feed liquid. A liquid supply system for plant cultivation comprising a liquid unit, wherein the drainage sterilizer is connected to an ozone generator and a pipe to the ozone generator, and an air diffuser provided at the bottom of the sterilization tank. Disposed in the sterilization tank, the ozone discharged from the air diffuser is sucked in, the bubbles of the ozone are further fined by a stirring blade, and the ozone is mixed with the waste liquid flowing into the sterilization tank, and the discharge port is discharged. Yo A submersible pump for discharging, and a throttle part having a small diameter connected to the discharge port of the submersible pump and having a small diameter in the middle thereof, and a liquid containing ozone discharged from the discharge port of the submersible pump is added in the throttle part. A liquid supply system for plant cultivation, comprising an ozone discharge pipe capable of diffusing ozone that has passed through the narrowed portion into a sterilization tank by applying pressure. 4. The liquid supply system for plant cultivation according to claim 3, wherein a supply amount of the sterilized waste liquid can be arbitrarily adjusted between the liquid supply tank and the waste liquid sterilizer. A liquid supply system for plant cultivation, characterized in that adjustment means is provided. 5. The liquid supply system for plant cultivation according to claim 3 or 4, wherein the drainage discharged from each bed is divided between the cultivation bed and the drainage stock tank by a predetermined system. A liquid supply system for plant cultivation, which is storable, and which is provided with a drainage measuring tank for supplying drainage to the drainage stock tank after measuring the drainage respectively. 6. The liquid supply system for plant cultivation according to claim 3, wherein the liquid supply tank comprises at least one of a source of raw water and a source of unused liquid fertilizer. A liquid supply system for plant cultivation, wherein at least one of raw water and unused liquid fertilizer can be mixed with the drained liquid that has been connected and has been sterilized.