JP5753740B2 - Antibacterial equipment for running water equipment - Google Patents

Description

  The present invention relates to an antibacterial instrument for running water equipment having a water flow path.

  In an air conditioner provided with appliances such as a water tray and a heat exchanger that generates drain in addition to piping, there is an air conditioning drain system that collects condensed water. In addition, there are floor drain systems for collecting pool water in floors of various plants. Such a system in which water exists is in an environment in which various microorganisms are easy to propagate. In addition to these various drain systems, for example, those that are in an environment in which microorganisms are easy to propagate, for example, water channels for hydroponics equipment, cooling towers, drainage channels for various miscellaneous water, etc. There is. In the equipment for hydroponics, various nutrients are added to help grow the plant to be cultivated, so that microorganisms such as bacteria are easily propagated in a cultivation tank or the like. In the present application, such a facility having a water flow path and in an environment in which microorganisms are likely to propagate is hereinafter simply referred to as “running water facility”.

  With regard to the propagation of microorganisms in such running water facilities, as for building facilities, for example, the law concerning the securing of a sanitary environment in buildings (published in 1970). For specific buildings defined in this law, such as stores and stores, the air environment and water supply and drainage sanitation are prescribed to be maintained and managed in accordance with building environmental sanitation standards so that the buildings can be used in a sanitary and comfortable manner. Yes. Medical facilities are not currently included in specific buildings, but in February 2008, the Ministry of Health, Labor and Welfare addressed the local governments to the medical institutions under their jurisdiction to the Building Sanitation Act and the “Maintenance in Buildings” There was an administrative notice that the “Management Manual” would be widely used as a reference for maintenance work. Because medical facilities are basically used by physically challenged people, it is considered necessary to further consider the impact of the facility environment on users' health. Therefore, medical facilities should be maintained in accordance with the Building Sanitation Law. Management may be important in the future.

  For example, focusing on air-conditioning drain systems, air-conditioning drain systems such as heat exchangers for air-conditioning equipment that condenses moisture in the air, drain pans that receive condensed water, and drain pipes generate drain water during the dehumidifying season in summer. Because of this, it becomes a moist environment, and therefore a good breeding environment for microorganisms. Therefore, microbial slime is generated in the drain pan or drain pipe, and the drain pipe may be blocked by causing the drain water to leak.

  Therefore, for example, there is a technique of installing an antibacterial agent in the drain pan in order to prevent health effects caused by microbial contamination of the air-conditioning drain system and a drain water leakage accident due to slime. Antibacterial agents of the type installed in the drain pan are those in which the solid antibacterial agent gradually elutes the antibacterial substance (for example, Patent Document 1), or a solution containing the antibacterial substance is constantly added to the drain pan at a constant flow rate. Some types have a mechanism to be injected. The solid antibacterial agent is used, for example, in a state packaged in containers (for example, Patent Documents 2-3).

JP 2008-151414 A International Publication No. 2007/141978 JP 2008-214131 A JP 2003-292345 A Japanese Patent Publication No. 7-63701 Special Table 2007-505702

  A conventional solid antibacterial agent consists of a solid substance containing a predetermined proportion of an antibacterial substance, and the solid substance itself gradually dissolves together with the antibacterial substance, so that the antibacterial substance is added to the water flowing through the piping of the running water facility. The principle is to elute. Therefore, the solid antibacterial agent becomes smaller and the surface area is reduced as elution progresses. Since the dissolution rate of the solid antibacterial agent depends on the surface area, the conventional solid antibacterial agent has a characteristic that the elution rate of the antibacterial substance decreases as the surface area decreases. Therefore, the conventional solid antibacterial agent has a problem that the elution concentration of the antibacterial substance is attenuated with the passage of time after installation, and the effect does not last for one season. In addition, in order to maintain the dissolution of antibacterial substances during one season, it is conceivable to increase the amount of solid antibacterial agent in anticipation of a decrease in elution concentration. Antibacterial substances are eluted more than necessary during the period, which is uneconomical.

  On the other hand, a solution-type antibacterial agent injector that injects a solution containing an antibacterial substance into a drain pan as needed at a constant flow rate, as long as water is in contact with the tip of the injection hole, regardless of the amount of water. Since the agent solution is injected, when the amount of water is small, the antibacterial agent solution is consumed more than necessary, which is uneconomical.

  The present application has been made in view of such problems, and is intended for a flowing water facility capable of supplying an antibacterial substance to a flow path through which water flows at a concentration having an effect of suppressing the growth of microorganisms for a certain period of time without waste. It aims to provide an antibacterial instrument.

  In order to solve the above problems, the invention disclosed in the present application uses the principle that a permeable membrane elutes a predetermined substance to the outside of the membrane in accordance with the concentration difference between the inside and outside, specifically, the antibacterial substance is solidified. The solid antibacterial agent was encapsulated in a permeable membrane bag that was permeable to the antibacterial substance.

  Specifically, the present invention is an antibacterial instrument for flowing water equipment that is installed in a flow path of flowing water equipment to suppress the growth of microorganisms, and is a solid antibacterial agent that solidifies an antibacterial substance that dissolves when contacted with water. A permeable membrane bag encapsulating the solid antibacterial agent and permeable to the antibacterial substance, wherein the permeable membrane bag is submerged by contact of the water that has penetrated into the bag with the solid antibacterial agent. The antibacterial substance dissolved in the water, so that a predetermined amount of the antibacterial substance according to the amount of water flowing through the place where the antibacterial instrument for the running water facility is installed can pass through the membrane of the permeable membrane bag A permeability coefficient and a surface area determined according to the amount of water and the solubility of the antimicrobial substance.

  When the antibacterial instrument for running water equipment is installed in a flow path (hereinafter simply referred to as “flow path”) through which water flows in the running water equipment, water penetrates into the permeable membrane bag, and the antimicrobial agent contacts the water. Therefore, the antibacterial substance constituting the antibacterial agent dissolves and elutes in water, but the rate at which the antibacterial substance dissolves out of the membrane is smaller than the rate of dissolution out of the membrane, so the inside of the permeable membrane bag The concentration of antibacterial substances in water remains relatively high compared to that outside the membrane. The concentration of the antibacterial substance dissolved in the water inside the permeable membrane bag is maintained at a higher concentration than the water outside the membrane as long as the solid antibacterial agent remains, but the concentration of the antibacterial substance is saturated or When the saturation concentration is approached, the antibacterial substance constituting the antibacterial agent stops dissolving or the dissolution rate becomes small, so that the progress of dissolution more than necessary is suppressed.

And the antimicrobial substance which permeate | transmitted the permeable membrane bag flows into the water which flows through the flow path downstream from the location where the antibacterial instrument for flowing water facilities is installed among the flow paths through which water flows. This permeable membrane bag is an antibacterial substance dissolved in water by the water that has penetrated into the bag coming into contact with the solid antibacterial agent, depending on the amount of water flowing through the place where antibacterial equipment for running water equipment is installed The permeability coefficient and surface area are determined according to the amount of water and the solubility of the antibacterial substance so that a predetermined amount of the antibacterial substance can permeate the membrane of the permeable membrane bag, and the concentration on both sides of the membrane is kept constant. Due to the principle of osmotic pressure, when the concentration of antibacterial substances in the water outside the permeable membrane bag is low, the amount of elution per unit time is large, and the concentration of antibacterial substances in the water outside the permeable membrane bag is high. Sometimes the amount of elution per unit time decreases. Further, when the concentration of the antibacterial substance outside the permeable membrane bag becomes equal to the concentration of the antibacterial substance in the membrane (that is, when the saturation concentration is reached), the permeation of the antibacterial substance automatically stops. Therefore, when the amount of water is less than expected, the concentration of the antibacterial substance in the drain water is increased and the amount of elution is automatically suppressed, so that the solid antibacterial agent is not consumed more than necessary.

  That is, if it is an antibacterial instrument for running water facilities, the elution rate of the antibacterial agent is self-adjusted according to the amount of water, so there is no wasteful consumption of the antibacterial agent and it is necessary and sufficient to have the effect of suppressing the growth of microorganisms. The antibacterial substance can be stably and continuously eluted at a concentration for a certain period. Therefore, it is possible to reliably suppress microbial contamination due to bacteria and fungi that cause slime in the flow path through which water flows more economically and conventionally than before.

  In addition, the antibacterial instrument for the flowing water facility may further include a resin or metal mesh bag that encloses the permeable membrane bag and protects it from the outside. If the antibacterial instrument for the flowing water equipment is configured in this way, the delicate permeable membrane bag is not easily damaged.

  Moreover, the antibacterial instrument for the flowing water facility may further include a weight that suppresses the floating of the antibacterial device for the flowing water facility due to water in the permeable membrane bag. If the antibacterial instrument for the flowing water equipment is configured in this way, it is difficult for the permeation membrane bag to be lifted by the drain water and the desired antibacterial substance does not permeate.

  In addition, the antibacterial instrument for the flowing water facility may further include a fastener provided with a clip at one end of the wire, and holding the antibacterial device for the flowing water facility at a desired position in the flow path of the flowing water facility. Good. If a fastener is provided, it is easy to collect used antibacterial equipment for running water facilities, and it can be kept at a desired position suitable for supplying an antibacterial agent.

  The antibacterial substance can be supplied to the flow path through which water flows at a concentration having an effect of suppressing the growth of microorganisms in the flowing water for a certain period without waste.

It is an external view of an antibacterial tablet. It is an internal structure figure of an antibacterial tablet. It is a graph which shows the measurement result of the silver ion density | concentration (relative value) in a microbe liquid, and the microbe density | concentration after culture | cultivation.

  Hereinafter, embodiments of the present invention will be described. The following embodiment shows one aspect of the present invention, and the technical scope of the present invention is not limited to the following embodiment.

<Embodiment>
FIG. 1 shows the appearance of an antibacterial tablet according to the present embodiment (which is an embodiment of “an antibacterial instrument for running water equipment” in the present application). This antibacterial tablet 1 is intended to suppress microbial contamination such as slime and mold generation in air-conditioning drain systems such as drain pans and drain piping systems of air-conditioning equipment, for example, near the drain outlet of the drain pan. The clip 4 of the wire 3 attached to the tablet body 2 is hooked on the edge of the drain pan so that the tablet body 2 stays. Although the material of the wire 3 and the clip 4 is not particularly specified, for example, it is desirable to use a resin material or a SUS material having excellent corrosion resistance. If it is hooked by the clip 4, the used antibacterial tablet 1 can be easily collected and can be kept at a desired position suitable for the supply of the antibacterial agent. In addition, this antibacterial tablet 1 flows not only in flowing water facilities through which drain water flows, but also, for example, a water channel for hydroponic cultivation in which there are concerns about diseases such as powdery mildew, a channel for cooling towers, and various miscellaneous water. It can be applied to various running water facilities where there is a concern about the growth of microorganisms, such as drainage channels.

  The internal structure of the antibacterial tablet 1 is shown in FIG. As shown in FIG. 2, the antibacterial tablet 1 includes a solid antibacterial agent 5 in which an antibacterial substance is solidified, which is a bag-like permeable membrane (hereinafter referred to as a permeable membrane bag 6) made of a permeable membrane having a predetermined permeability coefficient. It has a sealed structure inside. The antibacterial agent 5 may be either a hardly soluble or slightly soluble silver compound or a hardly soluble or slightly soluble antibacterial organic compound. When the antibacterial tablet 1 is applied to water containing chlorine (chloride ions) such as clean water, there is a possibility that a desired silver ion concentration cannot be obtained. Therefore, about the component of the antibacterial agent 5, it determines suitably according to the property of the water of the location in which the antibacterial agent tablet 1 is installed. On the other hand, in an air-conditioning drain system through which condensate water for air conditioning flows, the condensed water is essentially water vapor in the air, so it contains almost no chloride ions. Even if a silver compound is used, the antibacterial effect can be sustained without generation of silver chloride.

  Examples of the silver compound include silver iodide, silver bromide, silver thiocyanide, silver chloride, silver sulfite, silver carbonate, silver phosphate, silver oxide, silver chromate, silver dichromate, disilver tungstate (I ), Silver chlorite, silver nitrate, silver bromate, and silver sulfate. Examples of the antibacterial organic compound include 4- (2-nitrobutyl) morpholine, 1,3-dimorpholino-2-nitro-2-ethylpropane, 1,2-dibromo-2,4-dicyanobutane, and diiodomethyl- p-tolylsulfone, 2,4,5,6-tetrachloroisophthalonitrile, 4-chlorophenyl-3-iodopropargyl formal, 2- (4-thiocyanomethylthio) benzothiazole, 2-octyl-4-isothiazoline- 3-one, 1,2-benzisothiazolone-3, N-butyl-1,2-benzisothiazolone-3, N- (fluorodichloromethylthio) phthalimide, N, N-dimethyl-N '-(fluorodichloromethylthio ) -N'phenylsulfamide, N-dichlorofluoromethylthio-N ', N'-dimethyl Np-trisulfamide, 4,4 '-(tetramethylenedicarbonylamino) bis (1-decylpyridinium bromide), N, N'-hexamethylenebis (4-carbamoyl-1-decylpyridinium bromide), chlorhexidine Hydrochloride, α-bromocinnamaldehyde, 3-methyl-4-chlorophenol, 4-chloro-3,5-dimethylphenol, methyl p-hydroxybenzoate, ethyl p-hydroxybenzoate, p-hydroxybenzoic acid Propyl, butyl p-hydroxybenzoate, 2- (4-thiazolyl) benzimidazole, methyl 2-benzimidazolylcarbamate, 3,4,4'-trichlorocarbanilide, 4,4'-dichloro-3- (tri Fluoromethyl) carbanilide, 2,4,4'-trichloro-2'- Mud carboxymethyl diphenyl ether - ether, benzoic acid, 10,10'-oxy-bis phenoxazine arsine, and bis (2-pyridylthio-1-oxide) zinc.

Further, the permeable membrane bag 6 is preferably a porous membrane having pores with a diameter of 1 nm to 0.2 μm through which water and metal ions or organic compound molecules can permeate. Examples of such a porous membrane include a microfiltration membrane, an ultrafiltration membrane, a reverse osmosis membrane, and a dialysis membrane that are generally used in the field of water treatment and the like. In addition, the material of these permeable membranes and the form of a fine structure are not ask | required. Thus, for example, regenerated cellulose (copper ammonia / cellulose, deacetated cellulose acetate), cellulose acetate (cellulose diacetate (CDA), cellulose triacetate (CTA)), polyacrylonitrile copolymer, polymethyl methacrylate, ethylene vinyl alcohol copolymer Polymer, aromatic polysulfone, aromatic polyamide, carbonate / ethylene oxide copolymer, cellulose acetate (cellulose / diacetate, cellulose / acetate / polymer alloy), polyvinyl alcohol, ethylene vinyl alcohol copolymer, polymethyl methacrylate, polyethylene, polypropylene Aromatic polysulfone and the like can be applied.

Further, the surface area of the permeable membrane bag 6 and the amount of the antibacterial agent 5 enclosed in the permeable membrane bag 6 are the amount of drain water at the place where the antibacterial agent tablet 1 is installed, the solubility of the substance constituting the antibacterial agent 5, and the permeable membrane bag 6. Depending on the permeation coefficient of the antibacterial agent 5, for example, if the maximum total drain water amount is 6000 L, the surface area of the permeable membrane bag 6 is 0.0005 to 0.035 m ² . The upper limit of the mass is preferably about 50 g from the viewpoint of the space occupied by the antibacterial agent tablet 1.

In the case of the surface area of the permeable membrane bag 6 and 0.0005m ² ~0.035m ^2, if the antimicrobial agent 5 is silver carbonate, 8.68 × the permeability coefficient of the permeable membrane which constitutes the permeable membrane bag 6 10 ^-10 m / s ~
At 8.34 × 10 ⁻⁵ m / s, bacteria do not grow in the drain piping, or the antibacterial agent 5 elutes excessively and consumption does not proceed excessively. For example, when the permeable membrane bag 6 is composed of a permeable membrane having a permeability coefficient of 7.45 × 10 ⁻⁷ m / s, the surface area is 0.0088 m ^2.
When the permeable membrane bag 6 is made of a permeable membrane having a permeability coefficient of 1.24 × 10 ⁻⁷ m / s, the surface area is about 0.0248 m ^2, and it is practical as an antibacterial tablet for air conditioning drains. Can be used.

Further, when the antibacterial agent 5 is silver oxide, the permeation coefficient of the permeable membrane constituting the permeable membrane bag 6 is set to 9.29 × 10 ⁻¹¹ m / s to 1.95 × 10 ⁻⁵ m / s to provide antibacterial activity. When the agent 5 is silver phosphate, the permeation coefficient of the permeable membrane constituting the permeable membrane bag 6 is set to 3.81 × 10 ⁻¹⁰ m / s to 4.31 × 10 ⁻⁵ m / s, and the antibacterial agent 5 Is 2-octyl-4-isothiazolin-3-one, the transmission coefficient of the permeable membrane constituting the permeable membrane bag 6 is 3.97 × 10 ⁻¹⁰ m / s to 8.57 × 10 ⁻⁵ m / s.
Then, bacteria do not grow in the drain piping, or the antibacterial agent 5 does not elute excessively and consumption does not proceed excessively.

When the antibacterial agent 5 is silver oxide, for example, when the permeable membrane bag 6 is composed of a permeable membrane having a permeability coefficient of 7.45 × 10 ⁻⁷ m / s, the surface area is about 0.0018 m ² and the permeability coefficient is 1.24x1
When the permeable membrane bag 6 is composed of a permeable membrane of 0 ⁻⁷ m / s, if the surface area is about 0.0052 m ² , it can be used practically as an antibacterial tablet for air conditioning drains.

  The porous membrane constituting the permeable membrane bag 6 is generally thin and physically fragile. Therefore, as shown in FIG. 2, the antibacterial tablet 1 is made of a relatively strong lattice material such as a resin mesh, a metal mesh, or a punching metal to protect the permeable membrane bag 6. A protective mesh bag 7 protects the permeable membrane bag 6 containing the antibacterial agent 5 from the outside.

  In order to prevent the antibacterial tablet 1 from flowing along with the drain water, the antibacterial tablet 1 can be used with the clip 4 provided on the wire 3 being fastened to the edge of the drain pan. Further, the antibacterial tablet 1 has a plate-like, block-like or spherical piece made of a material having high corrosion resistance and high density (for example, SUS material) as a weight 8 inside the permeable membrane bag 6. The tablet body 2 is prevented from floating and flowing in the drain water.

The weight 8 does not need to be provided inside the permeable membrane bag 6. For example, the weight 8 is provided outside the permeable membrane bag 6 inside the mesh bag 7 or outside the mesh bag 7, so that the tablet body 2 is drained. You may keep it from floating. Further, it is not always necessary to provide a fastener such as the wire 3 or the clip 4, the weight 8, or the like. For example, the tablet body 2 may be fixed with a water-resistant adhesive tape or the like. Moreover, the tablet main body 2 does not need to be a rectangle as shown in FIG. 1 and may be, for example, a square, a round shape, a trapezoid, a triangle, or any other shape.

Drain water is collected from each of 3 units of FCU (Fan Coil Unit) where slime is generated (hereinafter referred to as Group A) and 3 units of FCU where slime is not generated (hereinafter referred to as Group B). The number of bacteria was counted. The results are shown in Table 1 below. The number of bacteria in group A is 1 × 10 ⁶ CFU / mL or more, which is 1000 times or more compared to group B. From the number of bacteria in group B, it is considered desirable to reduce the number of bacteria in the drain water to 1 × 10 ³ CFU / mL or less in order to prevent the generation of slime.

Next, in order to verify the effect of the antibacterial substance, an R2A medium component lacking organic nutrients suitable for the growth of varicella bacteria contained in drain water or the like was added to the drain water of group A to prepare a bacterial solution. Then, the prepared bacterial solution is subdivided into a plurality of types, one prepared by adding silver ions as an antibacterial substance to a predetermined concentration and one containing no silver ions, and culturing each for 8 hours. The number of viable bacteria was measured by a smear culture method for the bacterial solution after culture. The initial number of bacteria is 1 × 10 ⁶ CFU / mL for any bacterial solution.

The measurement results of the silver ion concentration (relative value) in the bacterial solution and the bacterial concentration after culture are shown in FIG. The relative value here means the number of bacteria in the state where slime is generated 1 × 10 ⁶ CFU / mL
When silver ions are applied to the drain water, the concentration of silver ions at which the number of bacteria is 1 × 10 ³ CFU / mL or less is 1. A silver ion concentration (relative value) of 0 is a result of a bacterial solution to which no silver ions are added. Bacterial fluid without added silver ions increases the number of bacteria to 2 × 10 ⁶ CFU
/ ML. On the other hand, in the case of adding silver ions, the number of bacteria decreased as the silver ion concentration increased. From the results of FIG. 3, it is understood that when the silver ion concentration (relative value) is 1 or more, the number of bacteria decreases to 1 × 10 ³ CFU / mL or less. Therefore, it can be seen that if the antibacterial agent can be supplied so that the silver ion concentration (relative value) in the drain water is always 1 or more, generation of slime can be prevented.

Based on the above experimental results, the following antibacterial tablet was prototyped. That is, as a transparent film bag for use in an antimicrobial tablet in the permeable membrane bag surface area 0.0088 m ² the permeability coefficient is comprised of permeable membranes of ^{7.5 × 10- 7 m / s,} SUS ball five 1g In addition, 0.77 g of silver carbonate powder was added and sealed. This was packaged with a protective mesh made of a polyethylene resin mesh having an opening ratio of about 70% to prepare an antibacterial tablet.

This antibacterial tablet is designed to be installed in a drain pan with a total accumulated drain water amount of 5000 L per season, and designed so that the silver ion concentration (relative value) in the drain water is always 1 or more throughout the season. It is. The mass of the silver carbonate powder is about 1.2 times the required amount so that a margin of about 20% can be made. The value of the drain water amount of 5000 L corresponds to the accumulated total drain water amount for one season of # 300 FCU (cooling capacity of about 2.5 kW) in the average outdoor air dehumidification load condition from early summer to early autumn in the Tokyo area.

  The first FCU (# 300, cooling capacity of about 2.5 kW) that does not install an antibacterial agent in the drain pan, and the second FCU (# 300, cooling) that has a conventional solid antibacterial agent that uses silver ions as an antibacterial substance An average outside air dehumidification from early summer to early autumn in the Tokyo area, with a capacity of about 2.5 kW) and a third FCU (# 300, cooling capacity of about 2.5 kW) with the prototype antibacterial tablet installed in a drain pan While supplying outside air adjusted to satisfy the load condition, the vehicle was operated for 10 hours during the daytime on weekdays, stopped at night and on Saturdays and Sundays, and simultaneously operated in parallel for 6 months. All FCUs were operated under the same conditions for two months before the experiment.

  From the time of installing the trial antibacterial tablet and the conventional solid antibacterial agent, the bacterial concentration in the drain water of each FCU was measured at regular intervals. In addition, the total total drain water amount of each FCU was equivalent at about 5200L. The bacterial concentration in the drain water of each FCU is shown in Table 2 below.

As is apparent from Table 2 above, the bacterial concentration of the third FCU in which the antibacterial tablet manufactured as a trial was installed gradually decreased after the installation and eventually became below the lower limit of quantification, and the first antibacterial agent was not installed in the drain pan. Compared with FCU, it maintained a clean level with two to three digits. In addition, the bacterial concentration of the second FCU in which the conventional solid antibacterial agent was installed decreased after the installation and eventually became below the lower limit of quantification, but increased again. From these results, it was confirmed that the growth of bacteria in the drain water was continuously suppressed by the trial antibacterial tablet. Moreover, it turned out that an effect does not last for one season with the conventional solid antibacterial agent.

  Next, Table 3 shows the silver ion concentration (relative value) in the drain water of the third FCU in which the antibacterial tablet is installed and the second FCU in which the conventional solid antibacterial agent is installed.

  As shown in Table 3 above, the silver ion concentration of the third FCU on which the trial antibacterial tablet was installed was stably maintained at 1 (relative value) or more from the initial stage to the final stage. On the other hand, the second FCU in which the conventional solid antibacterial agent was installed had a very high concentration in the initial stage, and then decayed rapidly. After 10 weeks, the concentration became a value close to zero.

  In Table 2, the total value of the numerical values of the silver ion concentration (relative value) of each FCU is shown in the last line. This total value means the total amount of silver ions eluted from each antibacterial agent, that is, an amount proportional to the total consumption of antibacterial substances. Comparing the total value of the two, it can be seen that the trial antibacterial tablet produced has a lower total consumption than the conventional solid antibacterial agent and there is no wasteful consumption of the antibacterial substance.

From the above, the antibacterial tablet according to the above embodiment can stably elute the antibacterial substance stably at a necessary minimum constant concentration that has an inhibitory effect on bacterial growth for one season. I understand that. And it was confirmed that it was economical because wasteful consumption of antibacterial substances was suppressed, and that the growth of microorganisms causing slime of drain water could be continuously suppressed throughout the season.

  A plurality of types of antibacterial tablets were prepared by alternately changing the permeation coefficient and surface area of the permeable membrane bag, the amount of antibacterial agent contained in the permeable membrane bag, and the number of weights. The permeation coefficient and surface area of the permeable membrane bag of each antibacterial tablet, the amount of antibacterial agent and the number of weights are shown in Table 4 below. The weight per weight is 1 g.

  Each antibacterial tablet as shown in Table 4 was installed in the FCU drain pan in the same manner as in Example 1, and the bacterial concentration in the drain water and the silver ion concentration (relative value) of the drain water were measured. In addition, about the bacterial concentration in the drain water of each FCU from the 4th to 8th which installed each antibacterial tablet shown in Table 4, it has shown in Table 2 as stated above.

  The bacterial concentration of each FCU from No. 4 to No. 8 gradually decreases after the antibacterial tablet is installed, and eventually falls below the lower limit of quantification, compared to the first FCU that does not have the antibacterial tablet manufactured as a prototype. A high degree of cleanliness of 2 to 3 digits was maintained. Further, the silver ion concentration (relative value) in the drain water of each of the fourth to eighth FCUs in which the antibacterial tablet prepared as a trial was installed was as shown in Table 3 above. From 1 to the last period, it was stably maintained at 1 (relative value) or more. Furthermore, as shown in the last row of Table 2, the total value of the silver ion concentrations (relative values) of FCUs 4 to 8 is less than that of the conventional solid antibacterial agent and has antibacterial properties. It turns out that there is no wasteful consumption of the substance.

  From the above, the trial antibacterial tablet installed in each FCU from the 4th to the 8th, as well as the trial antibacterial tablet installed in the 3rd FCU, suppresses bacterial growth for one season. It can be seen that the antibacterial substance can be eluted stably and stably at a certain minimum concentration that is effective. And it was confirmed that it was economical because wasteful consumption of antibacterial substances was suppressed, and that the growth of microorganisms causing slime of drain water could be continuously suppressed throughout the season.

Hereinafter, an example in which the concentration of the antibacterial substance in the drain water is always designed to be 2 ppm or more throughout the season when it is installed in a drain pan where the accumulated total drain water amount for one season is 5000 L will be described. In this example, the permeation coefficient and surface area of the permeable membrane bag, the amount of the antibacterial agent, and the number of weights as shown in the “9th FCU” and “10th FCU” columns of Table 4 described above, Antibacterial tablets were prepared in the same manner as in Example 1 and installed in the drain pans of the ninth and tenth FCUs. And about the 9th and 10th FCU and 1st FCU which has not installed the antibacterial agent, the fungi density | concentration in drain water and the silver ion density | concentration (relative value) of drain water were measured. The measurement results are shown in Table 5 below.

As shown in Table 5 above, the fungal concentrations of the 9th and 10th FCUs in which the antibacterial tablet according to the present example that was prototyped was installed gradually decreased after installation and eventually became below the lower limit of quantification, and the above-mentioned prototype Compared with the first FCU which does not have an antibacterial tablet, the cleanliness was maintained by 2 to 3 digits or more. From these results, it was confirmed that the fungal growth in the drain water was suppressed by the antibacterial agent tablet according to the present example.

  Next, Table 6 shows the change with time of the concentration of the antibacterial organic compound in the drain water of the ninth and tenth FCUs in which the antibacterial tablet according to the present embodiment was installed. The concentration was calculated by measuring the dry mass of the tablet every month and dividing the weight loss from the previous month mass by the amount of drain water for one month.

  As shown in Table 6 above, the concentration of the antibacterial organic compound of the ninth FCU on which the antibacterial tablet according to the present example that was prototyped was installed was stably maintained at 2 ppm or more from the initial stage to the final stage. As a result, the antibacterial tablet according to this example, which was experimentally produced, continuously elutes the antibacterial substance at a constant concentration that has an inhibitory effect on the growth of fungi for one season. It was confirmed that the growth of the fungus causing the stagnation was continuously suppressed throughout the season.

1 .... antibacterial tablet, 2 .... tablet body, 3 .... wire, 4 .... clip, 5 .... antibacterial agent, 6 .... permeable membrane bag, 7 .... mesh bag, 8 .... weight

Claims (4)

An antibacterial instrument for running water equipment that is installed in a drain pan that receives drain water from a fan coil unit of an air conditioning equipment and suppresses the growth of microorganisms,
A solid antibacterial agent that solidifies an antibacterial substance that dissolves when in contact with water;
A thin permeable membrane bag encapsulating the solid antibacterial agent and permeable to the antibacterial substance;
A weight that is provided in the permeable membrane bag and suppresses lifting due to water of the antibacterial instrument for running water, and
A clip provided at one end of the wire, and a fastener for fastening the antibacterial instrument for running water equipment to the edge of the drain pan ,
The permeable membrane bag is the antibacterial substance dissolved in water by the water that has penetrated into the bag coming into contact with the solid antibacterial agent, and the water flowing through the place where the antibacterial instrument for the water flow facility is installed A predetermined amount of antibacterial substance according to the amount of water has a permeability coefficient and a surface area determined according to the amount of water and the solubility of the antibacterial substance so that the membrane of the permeable membrane bag can pass through.
Antibacterial equipment for running water equipment. Further comprising a mesh bag made of resin or metal that encloses the permeable membrane bag and protects from the outside,
The antibacterial instrument for flowing water equipment according to claim 1. The permeable membrane bag has a permeability coefficient of 9.29 × 10 ⁻¹¹ m / s to 4.31 × 10 ⁻⁵ m / s.
Composed by permeation,
The antibacterial instrument for flowing water equipment according to claim 1 or 2. The permeable membrane bag is composed of a porous membrane having pores of 1 nm to 0.2 μm,
The antibacterial instrument for flowing water equipment as described in any one of Claim 1 to 3.

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