JP2009148740A - Sterilization/algaecide pipe body and sterilization/algaecide piping system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sterilization/algaecide pipe body and a sterilization/algaecide piping system safely and surely performing sterilization/algaecide of bacteria, microorganisms or algae only by connecting pipes and applying current, and easily stripping and removing attached sediment in the pipe body. <P>SOLUTION: The sterilization/algaecide pipe body is composed of a pipe body of an appropriate material, a caliber and a thickness, and by screwing or fitting the pipe body to a flange base part end edge of a connection flange consisting of an insulation material and formed with a flange part on one side thereof and a flange base part on the other side, and by mounting and disposing an insulation ring and a copper ion or silver ion elution electrode thereinside. The sterilization/algaecide piping system is formed by connecting the connection flanges of the sterilization/algaecide pipe bodies with each other and DC current is applied to the copper ion or silver ion elution electrode. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  INDUSTRIAL APPLICABILITY The present invention provides a sterilized algaecidal piping body and a sterilized algae that can prevent clogging of the circulation path and the occurrence of diseases due to the propagation of bacteria, microorganisms, algae, etc. in water and nutrient solution circulation paths such as pools, warm bath facilities, or hydroponics It relates to a piping system.

In recent years, the use of sports clubs and hot bath facilities has increased in abundance due to the combination of leisure time and health orientation.
Furthermore, in the agricultural field on the other side, so-called hydroponics that grows leafy vegetables and fruit vegetables with forcing, high quality, and high profitability has been actively introduced by providing cultivation management such as lighting, heat retention and fertilization. .

  By the way, swimming pools and bathing facilities in sports clubs use a huge amount of water, and always replenish water according to the usage situation. On the other hand, the used water is at most the secretions and skin fragments of users. In addition, since it is only slightly contaminated by hair or urine, various bacteria, etc., when the used water is drained, the cost associated with a huge amount of water is forced.

For this reason, in the pools and hot bath facilities, etc., a circulation path is formed that overflows the water used and is refilled after filtration and sterilization through the recovery tank, or drained from the bottom of the pool and warm bath facilities and filtered and sterilized again. Has been.
Furthermore, in hydroponic cultivation, the nutrient solution adjusted for the required nutrients is distributed to the seedlings in contact or dripped onto the seedlings, resulting in a large amount of discharged nutrient solution that is not absorbed by the seedlings. . Accordingly, a circulation path is formed for collecting the discharged nutrient solution, adjusting the nutrients, and reusing it.

  However, the water circulated in the circulation path of pools and bathing facilities is not only rich in nutrients such as user's secretions and skin fragments, but also contains bacteria, microorganisms and algae, and the water temperature is also compared. Because of its high temperature, it has favorable breeding conditions for these bacteria, microorganisms, and algae. Especially, for Legionella that prefers high temperatures, abnormal breeding is often caused, and the Legionella in the open system in the circulation path. Accidents are incurred in which a large number of morbidity and death occur as a result of being scattered in a mist and sucked by the user.

  Furthermore, in hydroponic cultivation, the nutrient solution itself contains a sufficient amount of nutrients, and the nutrient solution is brought into contact with the grown seedlings or dropped in an open system, so that algae grows particularly vigorously. The situation is that a great deal of time and money is required to clean the circuit.

  For this reason, in order to sterilize bacteria, microorganisms or algae mixed in the circulating water of pools and warm bath facilities, sodium hypozincate, highly bleached powder or chlorinated isocyanuric acid has been mixed in the required concentration ratio. Although the so-called chlorination treatment that makes sterilization algae has been made, there is a risk that in the chlorination means, if the pH value of the circulating water is low, there is a risk of generating harmful chlorine gas. The pH value fluctuates significantly depending on the number of persons, and as the pH value increases, the bactericidal and algicidal properties are lost in a geometric series, and the number of users is relatively small and the chlorination concentration is relatively high. The problem that causes inflammation of the user's mucous membrane and skin is also inherent.

  Furthermore, in chlorination, circulating circulatory water pipes contain trihalomethane produced by reaction with humic substances secreted by users, and the bactericidal and algicidal properties are reduced by reaction with ammonia, iron, manganese, etc. Along with the adhesion and deposition of inorganic substances, these bacteria, microorganisms, algae and other propagation materials and organic matter such as dead bodies are deposited and deposited, so-called biofilms. Since sterilization becomes virtually impossible, at present, the work for peeling and purifying these deposited deposits in the circulation pipe is frequently required, and the time and cost are enormous.

  In order to deal with such problems in chlorination, the inventor uses a copper ion oligodynamic action that exhibits stable bactericidal and algicidal properties even when the pH value of the circulating water fluctuates and does not cause the risk of generating harmful trihalomethanes. As a result, water sterilization equipment for sterilization and algae in the water circulation path has already been developed, and a large amount of water has been adopted in aquatic facilities nationwide.

However, such a water sterilization apparatus causes a direct current to flow between a pair of copper ion elution electrodes arranged opposite to each other to substantially elute 0.3 mg / l of copper ions into untreated water. Therefore, it is not only limited to use in the so-called vertical direction, where the circulating water can be in contact with the copper ion eluting electrode at all times, but also exhibits stable and superior bactericidal and algicidal properties compared to the temporary chlorine treatment. However, since inorganic deposits and organic deposits adhere and deposit in the circulation pipe as they are used, it is necessary to remove and purify these adhered deposits. The internal structure is narrower and more complex than the pipe, and it is difficult to insert the cleaning nozzle and hose with high-pressure cleaning water, so that it cannot be removed and cleaned. Copper water corresponding to the amount of water Depending on the amount of circulating water, the water sterilization apparatus becomes large and extremely expensive depending on the amount of circulating water. is there.
Japanese Patent Publication No. 3-1077 Japanese Patent Publication No. 60-301697

  As a result of repeated researches in view of such problems, the inventors have made copper ions or silver ions to a required concentration simply by interposing a connecting flange made of an insulating material without changing the circulation pipe forming the water circulation path. The present inventors have found out that sterilization can be performed by elution, and removal and purification of deposited deposits can be conveniently performed.

  In the present invention, by simply connecting and energizing each other, the required concentration of copper or silver ions is eluted in the circulating water to ensure sterilization and sterilization, and the deposits in the tube can be easily removed and purified. An object of the present invention is to provide a sterilized algae-pipe body and a sterilized algae-pipe system.

  Means for solving the above-mentioned problem is that a tube body made of an appropriate material, a caliber and a wall thickness, and a circular flat flat portion on one side thereof made of an insulating material, has a passage equal to the inner diameter of the tube body. A connecting hole is formed in the vicinity of the water mouth and the outer edge, and a threaded portion is formed on the flange base portion formed on the other side so that the end edge of the tube can be screwed together. An insulating ring made of an insulating material having a required width equal to the outer diameter and inner diameter of the tube is mounted and disposed therein, and further, a copper ion made of copper or silver material having a required width equal to the outer diameter and inner diameter of the tube body Alternatively, a silver ion eluting electrode is mounted and arranged, and in order to apply a direct current to an appropriate portion of the copper ion or silver ion eluting electrode, a connecting flange to which an energizing bolt is screwed and fixed from the outer surface of the flange base is formed. Connected to the end of the tube Di is screwed or fitted with microbicidal and algicidal pipe body is formed.

  A water leakage prevention packing is interposed between the flange portions of the sterilizing and algae piping body, and the pipe is connected with the same shape and length as the required water circulation path. Apply the required direct current to the energizing bolt of the algae piping, or convert the polarity appropriately and apply it to elute the required concentration of copper ions or silver ions in the circulating water to kill bacteria, microorganisms or algae. It exists in the sterilization algaecidal piping system that forms algae.

  In addition, when connecting the pipe body and the connecting flange, the pipe body and the sterilizing and algae pipe system to be connected after being fitted and fixed in the fitting portion formed in the flange base, and adjacent to the application of DC current Instead of energization between the ring-shaped elution electrodes that are mounted and arranged, the sterilization and algaecidal piping system and the sterilization and algaecidal piping system in which the plate-shaped elution electrodes are arranged oppositely and oppositely energized exist.

  The present invention uses such means, and the pipe used for a water or nutrient solution circulation path such as a pool, a warm bath facility, or hydroponics is made of a synthetic resin material, an iron material, or a non-ferrous metal material, and has a caliber or thickness. Can be used without any restriction, etc., and the connecting flange for the connecting pipe is integrally formed by using insulating material, especially polyacetal resin, polycarbonate resin, polyamide resin, polyamino resin, polyphenol resin, polyvinyl chloride resin, etc. It is extremely light and inexpensive, and these materials are excellent in water resistance, acid resistance, alkali resistance and corrosion resistance, and can be used safely for a long time.

Since the end of the flange base portion of the connecting flange is formed with a threaded portion or a fitting portion to be fitted in accordance with the diameter of the tube to be used, the end of the tube having a required length is provided. It can be simply and firmly connected.
In addition, an insulating ring made of an insulating material having a required width equal to the outer diameter and inner diameter of the pipe body is mounted and disposed inside the flange base to which the pipe body is screwed or fitted. Is the same as the outer diameter and inner diameter of the tube and has the required width, and the copper ion or silver ion eluting electrode made of copper or silver material, specifically, the appropriate position of the ring eluting electrode or plate eluting electrode is positioned on the outer surface of the flange base. Since it is screwed and fixed by an electric bolt, the tube is made of a conductive tube such as a ferrous tube or a non-ferrous metal tube even when a direct current is applied to the ring-shaped elution electrode or plate-shaped elution electrode. Even if it is used, the risk of electric leakage is prevented.

  Thus, the sterilizing and algaecidal piping body formed by connecting the connecting flange and the pipe body, the water leakage preventing packing interposed between the flange parts, the connection hole formed in the flange part and the connecting bolt and By tightening and screwing with the nut, the sterilizing and algaecidal piping bodies are connected and formed with the desired shape and length of the water circulation path.

In addition, by applying the required direct current from the energizing bolt to the ring-shaped elution pole or plate-shaped elution pole mounted and arranged in the flange base of the connection flange, the ring shape in each connection flange corresponds to the energization current. Dispersed and stable copper ions or silver ions are eluted from the eluting electrode or the plate-shaped eluting electrode, and reliable sterilization is performed.
In the present invention, since the insulating ring, the ring-shaped elution pole, the water passage opening of the flange portion and the like are formed to be equal to the outer diameter and inner diameter of the pipe body to be piped, It has many excellent features, such as being able to work without hindering the cleaning means.

  A tube made of an appropriate material, caliber and thickness, made of an insulating material, one side of which is circular and flat, has a water passage at the center equal to the inner diameter of the tube, and a connection hole is formed near the outer shape. The flange portion and the flange base portion on the other side are formed with a threaded portion to be screwed to the tube body, and the inside thereof has a required width equal to the outer diameter and inner diameter of the tube body. An insulating ring made of an insulating material is mounted and arranged, and an annular elution pole made of a copper material with a required width equal to the outer diameter and inner diameter of the tube body is disposed inside the ring. The pipe body is connected to the connecting flange that is screwed and fixed by the pipe to form a sterilized algae pipe body, and the flange parts of the sterilized algae pipe body are connected to each other through a water leakage prevention packing. The desired water circulation Algicidal piping system is formed, Shimuru configuration Thus even by applying a predetermined DC current from the current supply bolts elute copper ions required concentration.

  In the following, the embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory view of a sterilizing algae piping body 1, and FIG. 2 is a sectional explanatory view of a connecting flange 1B constituting the sterilization algae piping body 1. The pipe body 1A used for the sterilizing algaecidal pipe body 1 is not particularly limited as long as it retains water resistance, pressure resistance and strength that can be used for practical use. Non-ferrous pipes such as stainless steel pipes, aluminum pipes and copper pipes, polyvinyl chloride resins, polyester resins, polyethylene and polypropylene synthetic resin pipes, etc. can be used, and the diameter and thickness of these pipes 1A are appropriately determined depending on the specific use conditions. To be determined.

  On the other hand, as shown in FIG. 2, the connecting flange 1B constituting the sterilizing algae-pipe 1 is sterilized with a required shape and length by connecting the pipes 1A for circulating a large amount of circulating water and nutrient solution. It is necessary to use a strong insulating material in order to apply a direct current to the copper ion or silver ion eluting electrode 11E made of copper or silver material formed and disposed in the algaecidal piping system 2 and energize it. Specific examples of the material include polyacetal resin, polycarbonate resin, polyamide resin, polyamino resin, polyphenol resin, and polyvinyl chloride resin.

  As shown in FIG. 2, the connecting flange 1B constituting the sterilizing and algae-pipe 1 connects the pipes 1A for circulating a large amount of circulating water and nutrient solution, and sterilizes them in the required shape and length. A material that is tough and has excellent insulating properties because a direct current is applied to a copper ion or silver ion eluate 11E made of copper or a silver material formed in the algaecidal piping system 2 and energized. Specific materials used include polyacetal resin, polycarbonate resin, polyamide resin, polyamino resin, polyphenol resin, and polyvinyl chloride resin.

  The connecting flange 1B has a circular and flat flange portion 10B on one side, and has a diameter equal to the inner diameter of the tubular body 1A so that circulating water or nutrient solution can freely flow in the center. A water passage 10C is formed, and an appropriate number of connecting holes 10D for connecting the sterilized algaecidal piping bodies 1 to each other to form the sterilizing algaecidal piping system 2 at appropriate positions near the outer edge of the flange portion 10B. Is formed.

  Further, on the other side of the connecting flange 1B, a flange base portion 11B is provided with a required partial diameter and length, and an end edge of the tubular body 1A is screwed to an end edge of the flange base portion 11B. In order to attach and connect, the screwing part 11C matched with the outer diameter of the tube 1A is formed. In such a case, as a matter of course, a screwing groove 10A that can be screwed to the screwing portion 11C is also formed at the edge of the tube 1A.

An insulating ring 11D made of an insulating material is attached to the inside of the threaded portion 11C formed in the flange base portion 11B with a required width equal to the outer diameter and inner diameter of the tube body 1A to be screwed. Has been placed.
This insulating ring 11D is used when the DC body 1A is applied to a copper ion or silver ion elution electrode 11E made of copper or a silver material that is mounted and disposed further inside the insulating ring 11D. In order to prevent leakage in the case of a conductive tube such as a metal tube, the material of the insulating ring 11D is not particularly limited and can be used as long as it is insulating and sufficiently strong. In general, this can be dealt with by a material equivalent to the forming material of the connecting flange 1B.

Further inside the insulating ring 11D is a copper ion or silver ion elution electrode 11E made of copper or silver material having a required width equal to the outer diameter and inner diameter of the tube 1A, and more specifically, ring elution. The pole 12E is mounted and arranged.
This copper ion or silver ion eluting electrode 11E elutes copper ions or silver ions having a required concentration of bactericidal and algicidal properties in circulating circulating water or nutrient solution. Alternatively, the elution amount of silver ions is determined by the amount of energization current in circulating circulating water or nutrient solution, and therefore it is necessary to apply a required direct current to the copper ion or silver ion elution electrode 11E.

  For this reason, the ring-shaped elution pole 12E mounted and arranged in the flange base portion 11B is screwed and fixed from the outer surface of the flange base portion 11B by the energizing bolt 11F. Since this energizing bolt 11F is desired to have a good electrical conductivity, silver, copper, brass, nickel, aluminum or the like is used as a material.

  By the way, it should be noted that when the copper ion or silver ion eluting electrode 11E is mounted, a required direct current is applied to the copper ion or silver ion eluting electrode 11E, and one copper ion or silver ion eluting electrode 11E is applied. The circulated water or nutrient solution that is more circulated is energized as an energizing medium, and copper ions or silver ions corresponding to the energizing current amount are eluted to kill the sterilized algae. The copper ion or silver ion eluting electrode 11E is energized between the shortest distances.

  Therefore, when the sterilization and algaecidal piping 1 is energized, as shown in FIG. 3, the DC current applied to the copper ion and silver ion elution electrode 11E of one connection flange 1B is the same as the copper ion or the other connection flange 1B. Although the silver ion eluting electrode 11E is energized as a counter electrode, when the tube 1A to be used is made of a conductive material such as an iron tube or a non-ferrous metal tube, the tube 1A to be screwed or fitted and connected. When the distance to is close, current may not be sufficiently supplied to the counter electrode. For this purpose, the distance from the edge of the conductive tube 1A connected to the copper ion or silver ion eluting electrode 11E mounted on the connecting flange 1B is kept larger than the distance from the counter electrode. Adjustment should be made with the insulating ring 11D.

  The sterilized algaecidal piping body 1 of the present invention is used as a sterilizing algaecidal piping system 2 by appropriately connecting the number to a water circulation path such as a pool or a warm bath facility or a nutrient solution circulation path in hydroponics. From the copper ion or silver ion eluate 11E mounted and arranged in the flange bases 11B of the connecting flanges 1B connected to each other, the copper ions or silver ions are surely eluted in the circulating water or the circulating nutrient solution. Sterilization is done.

On the other hand, when the circulating water channel or the circulating nutrient solution is remarkably short, in order to efficiently elute copper ions or silver ions for sterilization and algae in the circulating water or circulating nutrient solution, the circulating circulation It is convenient to energize the water or the circulating nutrient solution, that is, to place the copper ion or silver ion eluting electrode 11E facing each other.
Therefore, as a countermeasure, the outer surface and the inner surface of the insulating ring 11D mounted and disposed in the flange base 11B are equal to the curvature of the outer diameter and inner diameter of the tube body 1 as shown in FIG. In addition, the eluting electrode 11E having a length of copper ions or silver ions, more specifically, the plate eluting electrodes 12F and 12F are opposed to each other, and the respective appropriate positions are energized bolts 11F for energizing the flange base portions 11B. The thing of the structure fixed by screwing from the outer surface of this is proposed.

  When the plate-shaped elution poles 12F and 12F are mounted and arranged, the water inlet 10C formed at the inner diameter of the tubular body 1A through which the circulating water or nutrient solution flows, the inner diameter of the insulating ring 11D, or the center of the flange portion 10B. As a result of being mounted and arranged facing each other in a flow passage having the same diameter, there is a risk that concave grooves 12G and 12G are generated and inorganic deposits and organic deposits are accumulated in the concave grooves 12G and 12G. . Therefore, as a countermeasure against this, as shown in FIG. 5, on one side of the insulating ring 11D having a sufficient width, the engagement edge 12D which can be engaged with the recessed grooves 12G and 12G and can keep the inside of the flow passage at substantially the same diameter. It is desirable to use an insulating ring 11D having

Thus, the sterilizing and algaecidal piping body 1 with the connecting flange 1B connected to the end of the tubular body 1A having an appropriate material and a caliber and thickness is a water circulation path in a pool or a bathing facility or a nutrient solution circulation in hydroponics. According to the structure and length of the road, as shown in FIG. 6, the flange portions 10 </ b> B of the mutual connection flanges 1 </ b> B are joined, and the connection bolt nuts 10 </ b> E are connected to the connection holes 10 </ b> D formed in the flange portions 10 </ b> B. The sterilization and algaecidal piping system 2 is formed by being threaded and tightened.
In order to prevent water leakage from the joint portions of the flange portions 10B and 10B at the time of such a pipe connection, a normal water leakage prevention packing 2A is interposed, and the water leakage prevention packing 2A has no particular restrictions. Generally, synthetic rubber materials such as chloroprene rubber, butadiene rubber, acrylic rubber, or silicon rubber are used.

FIG. 7 is an explanatory view of the sterilized algaecidal piping system 2 of the connected hot bath facility, and the sterilizing algaecidal piping system 2 elutes copper ions or silver ions having a required concentration in circulating water. Therefore, a direct current is applied. This direct current application is intended to kill bacteria such as bacteria in circulating water and nutrient solution, especially Legionella bacteria and microorganisms, and algae with a strong fertility. Must be eluted with a copper ion or silver ion concentration of at least 0.3 mg / l. On the other hand, if excessive direct current is applied and energized, electrolysis of the circulating water or nutrient solution is caused to cause acidic water. There is a risk that water will be denatured due to hydration or alkali hydration, and the amount of dissolved oxygen will be extremely reduced.
For this purpose, a direct current is applied so that the energization amount between the copper ion or silver ion elution electrodes 11E and 11E is energized at a current density of 1.0 mA / cm ² or less at the maximum.

  The DC current is applied by applying a current supply bolt 11F formed by screwing and fixing a copper ion or silver ion elution electrode 11E mounted and disposed in the flange base portion 11B of each connecting flange 1B with a conductive wire 20B from an appropriate DC power supply device 2B. The DC power supply device 2B has no particular restrictions, and the DC power supply 2B is stepped down to a voltage of about 50 to 60 V or less, which is safe for handling a general AC power supply by a step-down transformer, and then DC is supplied via a rectifier. It is composed of a resistor and an ammeter that limit the energization of excess current and no current, and a polarity conversion switch that can convert the applied polarity at an appropriate time. In such a case, when a direct current is applied to the copper or silver ion elution electrodes 11E and 11E with the same polarity and the current is applied, a part of the copper ions or silver ions eluted from the anode (+) is converted into the cathode (−). ), And further, the adhesion of the scale to the anode is promoted to reduce the electrical conductivity over time, and to cope with the decrease in the bactericidal and algicidal efficiency of the eluted copper ions or silver ions.

  Furthermore, when applying a direct current, the application differs depending on the specific shape of the copper ion or silver ion eluting electrode 11E mounted and disposed in the flange base portion 11B of the connecting flange 1B and the mounting arrangement state, as shown in FIG. When the ring-shaped elution pole 12E is used, in order to energize between the ring-shaped elution poles 12E and 12E of the connecting flange 1B, it may be applied so that one is an anode and the other is a cathode. On the other hand, when the plate-shaped elution poles 12F and 12F are used, it is necessary to energize between the plate-shaped elution poles 12F and 12F that are mounted to face each other, and depending on the diameter of the tube 1A used, the distance between the counter electrodes may also be increased. growing. Therefore, in such a case, as shown in FIG. 8B, the plate-shaped elution poles 12F and 12F on one side of the connecting flange 1B are connected in parallel as an anode, and the other counter-plate elution poles 12F and 12F are used as a cathode. It should be noted that they are applied in parallel.

  INDUSTRIAL APPLICABILITY In the water circulation path of industrial cooling water, agricultural water, waterscape facilities, and the like, the present invention exhibits an excellent bactericidal and algicidal effect, and can maintain and manage the water circulation path very simply and inexpensively.

  It is explanatory drawing of a sterilization algae piping body.   It is a section explanatory view of a connection flange.   It is a mounting arrangement explanatory view of a copper ion or silver ion elution pole.   It is a mounting arrangement explanatory view of a plate elution pole.   It is explanatory drawing of the insulating ring in which the concave groove was formed.   It is explanatory drawing of a connecting pipe part.   It is explanatory drawing of the sterilization algae piping system in a warm bath facility.   It is explanatory drawing of the application method of a direct current.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sterilization algae piping body 1A Pipe body 1B Connection flange 10A Screwing groove 10B Flange part 10C Water flow port 10D Connection hole 10E Connection bolt nut 11B Flange base part 11C Screwing part 11D Insulation ring 11E Copper ion or silver ion elution pole 11F Conduction bolt 12D Engagement edge 12E Annular elution pole 12F Plate elution pole 12G Concave groove 2 Sterilization and algae piping system 2A Water leakage prevention packing 2B DC power supply device 20B Conductive wire

Claims (3)

  A tube made of an appropriate material, caliber and thickness, and made of an insulating material, and at one side of the tube, a circular flat flat flange part, a water flow port equal to the inner diameter of the tube, and an appropriate position near its outer edge Is formed with a connecting hole, and at the end of the flange base formed on the other side is formed with a threaded portion or a fitting portion for connecting the tube body, and the inside is made of an insulating material. An insulating ring having a required width equal to the outer diameter and inner diameter of the pipe body is mounted and disposed therein, and further, a copper material made of a copper material or a silver material having a required width equal to the outer diameter and inner diameter of the pipe body is provided therein. The appropriate position of the ion or silver ion elution pole consists of a connecting flange that is screwed and fixed with a current-carrying bolt from the outer surface of the flange base, and the connecting flange is screwed or fitted to the edge of the tube Bactericidal kill consisting of a structured The pipe body.   Copper or silver ion eluting electrode is a plate-shaped eluting electrode with the required width and length equal to the curvature of the outer diameter and inner diameter of the tube, and is fixed by screwing with an electric bolt from the outer surface of the flange base. 2. The sterilization according to claim 1, wherein an insulating ring is used which is mounted oppositely and formed with an engagement edge capable of engaging in a recessed groove associated with the opposing mounting arrangement of the plate-shaped elution pole. Algae plumbing body. The connecting flanges of the sterilizing and algae-plumbing bodies according to claim 1 or 2 are connected to each other through a water leakage prevention packing to form a circulation path for water or nutrient solution, and a direct current is supplied from a DC power source to a copper ion Alternatively, apply a current density of 1.0 mA / cm ² or less to the elution electrode of silver ions, and elute copper ions or silver ions at a concentration of 0.3 mg / l or more in circulating water or circulating nutrient solution to Eggplant, sterilized algaecidal piping system.

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