JP2017114536A - Drinking water dispenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drinking water dispenser capable of removing saprophyte, and capable of preventing or reducing occurrence of taste transfer or odor transfer to drinking water which is collected.SOLUTION: A drinking water dispenser 10 of the invention at least comprises: a bottle 11 for supplying drinking water 15; and a body part 12 to which the bottle 11 can be detachably installed, and supplying the drinking water 15 from a water supply port 13. The body part 12 comprises at least one hollow fiber membrane module 18 for filtering the drinking water 15, and the hollow fiber membrane on the hollow fiber membrane module 18 has hydrophilia and is not subjected to graft polymerization.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a drinking water dispenser, and more particularly to a drinking water dispenser that reliably removes germs of collected drinking water and does not cause taste transfer or odor.

  A drinking water dispenser (or drinking water server) is installed with a large-capacity bottle (about 7 to 12 L) filled with drinking water such as mineral water, and the required amount is taken in a cup or the like in a timely manner. Is. In recent years, an increasing number of bottles are being delivered to homes, restaurants, hospitals, various offices, and the like.

  As such a conventional drinking water dispenser, for example, the one shown in FIG. According to the drinking water dispenser shown in the figure, the drinking water supplied from the bottle is cooled by the cooling mechanism provided in the drinking water dispenser and stored in the cold water tank, and is also heated by the heating mechanism to be the hot water tank. The structure is also stored. Thereby, the user can collect both cold water and hot water.

  Since such a drinking water dispenser fills the bottle with drinking water that does not contain residual chlorine, when the bottle is replaced, if germs or the like adhere to the outlet and enter the inside of the dispenser, There is a possibility that various germs may occur. In particular, in the flow path other than warm water such as cooling water or room temperature water in the drinking water dispenser, there is a possibility that germs that have entered from the outside grow.

  In order to solve such a problem, for example, Patent Document 2 below discloses a method of providing a filtering means in a passage upstream of a drinking water outlet. According to this method, since the filtering means removes germs, the drinking water flowing out from the water outlet can be kept clean. Further, as the filtering means, hollow fiber membranes and adsorbents are disclosed, and when the hollow fiber membranes are used, it is said that extremely fine bacteria can be removed. It is said that chlorine, mold odor, and odor attached in the drinking water dispenser can be adsorbed. Further, as the hollow fiber membrane, polyolefin-based hollow fiber membranes such as polyethylene and polypropylene are preferred from the viewpoints of handleability and processing characteristics.

  However, depending on the type of hollow fiber membrane to be used, there is a problem that the taste or smell of drinking water due to the resin derived from the hollow fiber membrane is attached. As described above, it is said that by providing an adsorbent, it is possible to adsorb odors such as residual chlorine, but since this adsorbent is installed upstream of the hollow fiber membrane, it constitutes a hollow fiber membrane. It is difficult to remove taste transfer and smell derived from the resin. Although it is conceivable to install an adsorbent downstream of the hollow fiber membrane, in this case, since the adsorbent becomes a hotbed for the propagation of miscellaneous bacteria, there is a possibility that the miscellaneous bacteria that have entered from the outlet will propagate on the adsorbent. . As a result, there is a problem that germs are detected from the collected drinking water.

  Moreover, in order to remove the taste transfer and smell derived from the resin of the hollow fiber membrane, it is conceivable to continue drinking water flow, but in order to completely remove it, it is necessary to carry out a large amount of water flow. In addition, a method of removing taste transfer and odor by washing before installing the hollow fiber membrane in the drinking water dispenser can be considered, but the pore size of the hollow fiber membrane changes due to the drying treatment after the washing, and the filtration performance May be reduced.

JP 2011-255960 A Republished patent WO2007 / 094364

  The present invention has been made in view of the above-mentioned problems, and its purpose is to remove miscellaneous bacteria and the like and to prevent or reduce the transfer of taste and smell to the sampled drinking water. To provide a dispenser.

The conventional problems are solved by the invention described below.
That is, the drinking water dispenser according to the present invention includes a bottle for supplying drinking water, and a main body part that can detachably install the bottle and discharge the drinking water from a water outlet. At least one hollow fiber membrane module that filters the drinking water before water discharge is provided in the main body, and the hollow fiber membrane in the hollow fiber membrane module has hydrophilicity, and It is not graft-polymerized.

  Graft polymerization is carried out for the purpose of modifying the hollow fiber membrane to be hydrophilic when it is inherently hydrophobic. However, when a hollow fiber membrane module that has been modified by graft polymerization is used as a filtering means for drinking water, it is presumed that the drinking water after filtration has a taste or smell. Therefore, in this invention, as the said structure, it is set as the structure provided with the hollow fiber membrane which has hydrophilic property and is not graft-polymerized in the hollow fiber membrane module as a filtration means of drinking water. Thereby, it is possible to prevent taste transfer and odor from being added while removing or reducing bacteria in drinking water after filtration.

  In the above configuration, the hollow fiber membrane is preferably a polysulfone-based hollow fiber membrane having hydrophilicity. The “polysulfone-based hollow fiber membrane” means a hollow fiber membrane made mainly of a polysulfone-based polymer.

  Further, in the above configuration, the main body is a storage tank that stores the drinking water supplied from the bottle, and stores the drinking water in the upper layer at room temperature, and in the lower layer A storage unit that is cooled and stored, a hot water tank that is located below the storage tank and stores drinking water supplied from the storage tank at a high temperature, and the outlet and the storage tank are connected, and the storage A cooling water supply pipe for flowing the cooled drinking water stored in the tank, the hollow fiber membrane module is provided at an arbitrary position of the cooling water supply pipe, from the storage tank It is preferable that the supplied cooling water is filtered.

  Further, in the above-described configuration, the main body portion is located on the lower side of the other storage tank that stores the drinking water supplied from the bottle at room temperature, and the other storage tank. A cooling water tank that cools and stores the drinking water supplied from, and a hot water tank that is located below the cooling water tank and stores the drinking water supplied from the other storage tank at a high temperature. The yarn membrane module is preferably provided between the other storage tank and the cooling water tank and filters drinking water supplied from the other storage tank.

  Further, in the above-described configuration, the main body portion is located on the lower side of the other storage tank that stores the drinking water supplied from the bottle at room temperature, and the other storage tank. A cooling water tank that cools and stores the drinking water supplied from, a hot water tank that is located below the cooling water tank and stores the drinking water supplied from the other storage tank at a high temperature, and the other storage A supply pipe that supplies normal temperature drinking water stored in a tank to the cooling water layer, and the hollow fiber membrane module is provided at an arbitrary position of the supply pipe, from the other storage tank It is preferable that the normal temperature drinking water to be supplied is filtered.

  Further, in the above configuration, the main body includes a water intake pipe for taking drinking water from the bottle, and the hollow fiber membrane module is provided at an arbitrary position of the water intake pipe, It is preferable that the drinking water taken from the bottle is filtered.

The present invention has the following effects by the means described above.
Since the drinking water dispenser of the present invention includes a hollow fiber membrane module that has hydrophilicity and is not graft-polymerized, it not only removes or reduces the germs of the drinking water sampled, There is an effect that it is possible to prevent taste transfer and smell derived from the graft polymerized resin.

It is a cross-sectional schematic diagram showing the whole structure of the drinking water dispenser which concerns on Embodiment 1 of this invention. It is a cross-sectional schematic diagram showing the whole structure of the hollow fiber membrane module in the said drinking water dispenser. It is a front view showing the whole structure of the said drinking water dispenser. It is a cross-sectional schematic diagram showing the whole structure of the drinking water dispenser which concerns on Embodiment 2 of this invention. It is a cross-sectional schematic diagram showing the whole structure of the drinking water dispenser which concerns on Embodiment 3 of this invention. It is a cross-sectional schematic diagram showing the whole structure of the drinking water dispenser which concerns on Embodiment 4 of this invention. It is a schematic diagram showing the whole structure of the experimental apparatus used by the Example and the comparative example.

(Embodiment 1)
The drinking water dispenser according to the present embodiment will be described below. FIG. 1 is a schematic cross-sectional view illustrating the entire configuration of a drinking water dispenser according to Embodiment 1. FIG. 2 is a schematic cross-sectional view showing the overall configuration of the hollow fiber membrane module in the drinking water dispenser. FIG. 3 is a front view illustrating the overall configuration of the drinking water dispenser.

  As shown in FIG. 1, the drinking water dispenser 10 of the present embodiment includes at least a bottle 11 for supplying drinking water 15 and a main body portion 12 on which the bottle 11 can be detachably installed. It is a configuration.

  The main body 12 includes a water outlet 13 for discharging the drinking water 15, a storage tank 14 for storing drinking water supplied from the bottle 11, a hot water tank 16 provided below the storage tank 14, the water outlet 13 and storage. A cooling water supply pipe 17 connecting the tank 14 and a hollow fiber membrane module 18 provided in the cooling water supply pipe 17 are mainly provided.

  The bottle 11 is attached to the water inlet 19 in the upper part of the main body 12 with the water inlet 36 facing downward. In the central portion of the water inlet 19, a water intake pipe 20 is installed to be inserted into the water inlet 36 of the bottle 11 and take in the drinking water 15. The drinking water 15 taken in by the intake pipe 20 is stored in the storage tank 14. In addition, it does not specifically limit as a constituent material of the bottle 11, For example, PET (polyethylene terephthalate) etc. are mentioned.

  The storage tank 14 stores the drinking water 15 supplied from the bottle 11 by dividing it into normal temperature drinking water and cooling water cooled to a constant temperature. More specifically, a plate-shaped separator 21 is provided inside the storage tank 14, and a normal temperature water layer 14 a for storing drinking water at normal temperature is provided above the separator 21, and below, A cooling water layer 14b for cooling and storing drinking water is provided. A cooling means (not shown) is provided on the outer periphery of the storage tank 14 at a portion corresponding to the lower side of the separator 21, whereby the drinking water stored in the cooling water layer 14 b can be cooled. it can.

  A cooling water supply pipe 17 communicating with the water outlet 13 is connected to the storage tank 14. Since the cooling water supply pipe 17 is connected to the bottom of the storage tank 14, only the cooling water of the cooling water layer 14 b in the storage tank 14 flows through the cooling water supply pipe 17.

  An external communication part 34 with a built-in filter is provided on the ceiling part of the storage tank 14. When normal temperature drinking water or cooling water is taken out from the storage tank 14, or when hot water is taken out from the hot water tank 16, it prevents the pressure in the storage tank 14 from dropping by taking in outside air from the external communication portion 34. can do. As a result, the water level of the drinking water stored in the room temperature water layer 14a can be lowered without difficulty. Further, when the drinking water 15 is supplied from the bottle 11 to the storage tank 14, the pressure inside the storage tank 14 is increased by discharging the air inside the storage tank 14 through the external communication portion 34. Can be suppressed. Thereby, drinking water can be stored in the storage tank 14 without difficulty. Since the external communication portion 34 is provided with the filter, it is possible to prevent germs and the like from entering the storage tank 14.

  The cooling water supply pipe 17 is provided with a hollow fiber membrane module 18. Here, as shown in FIG. 2, the hollow fiber membrane module 18 has a structure in which a filter medium composed of a hollow fiber membrane 22 fixed in a liquid-tight manner by a sealing material 23 is provided inside the main case 26. The hollow fiber membrane 22 is bent on the upstream side (primary side), and both ends thereof are provided so as to be fixed by the sealing material 23 on the downstream side (secondary side).

  Cooling water as raw water flowing from the storage tank 14 through the cooling water supply pipe 17 flows into the hollow fiber membrane module 18 from the cooling water inlet 24, is filtered by the hollow fiber membrane 22, and is filtered from the filtered water outlet 25 as filtered water. Flows out. This makes it possible to remove germs in the cooling water. In addition, when the direction which flows raw | natural water is reverse, ie, the direction from a secondary side to a primary side, a pressure loss will become large too much and it will hardly flow.

  The hollow fiber membrane 22 is porous and has a tubular structure. Further, the hollow fiber membrane 22 is not particularly limited as long as it has hydrophilicity and is not subjected to graft polymerization. Examples of such a hollow fiber membrane 22 include a hollow fiber membrane that is inherently hydrophilic in nature and a hollow fiber membrane imparted with hydrophilicity. Examples of the hollow fiber membrane that is inherently hydrophilic in nature include those made of various materials such as cellulose, polyvinyl alcohol, ethylene / vinyl alcohol copolymer, polyacrylonitrile, and polyamide. . Examples of the hollow fiber membrane provided with hydrophilicity include polyolefin (polyethylene, polypropylene), polyether, polymethyl methacrylate, polysulfone, polytetrafluoroethylene, polyvinylidene fluoride, It consists of various materials such as polycarbonate and polyester, and surface treatment such as coating, ozone, plasma, ultraviolet (UV), electron beam (EB), chemical etching, metal oxide deposition or sputtering treatment. What has been given. Moreover, the thing by the blend etc. to which hydrophilic polymer was added to these various materials are mentioned.

  Examples of the polysulfone-based polymer include polysulfone, polyethersulfone, polyphenylenesulfone, and the like.

  The method for hydrophilizing the polysulfone-based hollow fiber membrane is not particularly limited, and a conventionally known method can be employed. Specifically, for example, a method of imparting hydrophilicity to the polysulfone-based hollow fiber membrane by adding an appropriate amount of a hydrophilic polymer such as polyvinylpyrrolidone can be mentioned.

Effective membrane area is preferably 0.1 m ² or more hollow fiber membrane ^22, and more preferably 0.1 m 2 0.5 m ^2. By setting the effective membrane area to 0.1 m ² or more, it is possible to maintain the filtration performance of germs and the like, and to prevent the filtration life from becoming excessively short. On the other hand, the upper limit of the effective membrane area is not particularly limited because the filtration life increases as the effective membrane area increases. However, if the effective membrane area exceeds 0.5 m ² , the filtration performance is saturated and the improvement of the filtration effect is not expected so much.

  The pore diameter of the hollow fiber membrane 22 is preferably 0.01 μm to 0.45 μm, and more preferably 0.01 μm to 0.1 μm. By setting the hole diameter to 0.01 μm or more, it is possible to suppress clogging and pressure loss, and difficulty in flowing. On the other hand, by setting the pore diameter to 0.45 μm or less, it is possible to remove germs and the like.

  The outer diameter of the hollow fiber membrane 22 is not particularly limited, and can be appropriately set as necessary. Usually, it is 20 micrometers-3000 micrometers. Moreover, the film thickness of the hollow fiber membrane 22 is not specifically limited, It can set suitably as needed. Usually, it is 5 micrometers-1000 micrometers. Further, the filling rate of the hollow fiber membrane 22 into the main case 26 is preferably 30% to 50%. By making the filling rate 30% or more, it is possible to suppress a decrease in filtration performance. On the other hand, when the filling rate is 50% or less, it is possible to prevent the production from becoming difficult in the manufacturing process.

  The sealing material 23 is not particularly limited, and a conventionally known material made of urethane resin, epoxy resin, polyolefin resin or the like can be used.

  The cooling water supply pipe 17 is provided with a pump 27 on the upstream side of the hollow fiber membrane module 18. Thereby, cooling water can be pumped at a flow rate above a certain level. However, the present embodiment is not limited to this aspect, and cooling water can be collected even if the pump 27 is omitted. The pump 27 may be provided on the downstream side of the hollow fiber membrane module 18.

  Furthermore, the cooling water supply pipe 17 is connected to the cold water outlet 13a, so that the hollow fiber membrane module 28 removes or reduces germs and discharges the cooling water in which taste transfer and odor are suppressed. Yes (see FIG. 3).

  The hot water tank 16 is located below the storage tank 14. The hot water tank 16 is provided with a heater (not shown) for heating the stored drinking water, and is stored in a hot water state. Further, the hot water tank 16 is provided with a supply pipe 29 for allowing normal temperature drinking water to be supplied from the normal temperature water layer 14a in the storage tank 14. The inlet opening 29 a of the supply pipe 29 is open to the room temperature water layer 14 a of the storage tank 14. Further, the outlet opening 29 b is opened on the bottom side of the hot water tank 16. Furthermore, the hot water tank 16 is connected to the hot water outlet 13b via the hot water supply pipe 28, thereby allowing warm water to be discharged from the hot water outlet 13b (see FIG. 3).

  In addition, the drinking water dispenser 10 of this Embodiment suppresses that a taste transfer and a smell are attached to the drinking water sampled only by installing the hollow fiber membrane module 18 just before the upstream of the water outlet 13. It is possible to remove or reduce various germs. Therefore, a complicated apparatus configuration can be avoided.

(Embodiment 2)
The drinking water dispenser according to the second embodiment will be described below based on FIG. FIG. 4 is a schematic cross-sectional view illustrating the entire configuration of the drinking water dispenser according to the second embodiment. In addition, about the component which has the same function as the drinking water dispenser of the said Embodiment 1, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIG. 4, the drinking water dispenser 30 according to the present embodiment stores the drinking water at normal temperature and the cooling water separately in separate tanks as compared with the drinking water dispenser 10 according to the first embodiment. The difference is that the hollow fiber membrane module 18 is arranged to communicate with each other. Moreover, the point which provided the exhaust pressure pipe 35 for relieving the pressure fluctuation inside the cooling water tank 33 differs.

  More specifically, the drinking water dispenser 30 includes, in the main body 31, another storage tank 32, a cooling water tank 33 positioned below the other storage tank 32, and a temperature positioned below the cooling water tank 33. A water tank 16 is mainly provided.

  The other storage tank 32 stores the drinking water supplied from the bottle 11 at normal temperature. The cooling water tank 33 cools normal temperature drinking water supplied from the other storage tank 32 via the hollow fiber membrane module 18 and stores it as cooling water. Further, by providing the external communication portion 34 provided on the ceiling portion of the other storage tank 32, it is possible to take in external air via the external communication portion 34. As a result, it is possible to prevent the inside of the bottle 11 from having a negative pressure and the supply amount of the drinking water 15 from the bottle 11 to the other storage tank 32 from being lowered.

  The cooling water stored in the cooling water tank 33 can be filtered by the hollow fiber membrane module 18 to remove or reduce various germs. In addition, as described above, the hollow fiber membrane module 18 includes the hollow fiber membrane 22 that has hydrophilicity and is not graft-polymerized, and therefore prevents the taste and smell from being transferred to the cooling water. can do.

  A cooling water supply pipe 17 for communicating with the water outlet 13 is connected to the bottom of the cooling water tank 33. The cooling water supply pipe 17 is provided with a pump 27, whereby a flow rate of a certain level or more can be secured for the cooling water flowing through the cooling water supply pipe 17. However, the present embodiment is not limited to this mode, and water can be collected without installing the pump 27.

  The exhaust pressure pipe 35 connects the top of the cooling water tank 33 and the top of the storage tank 32. The exhaust pressure pipe 35 reduces the pressure fluctuation when the water pressure inside the cooling water tank 33 rises and the pressure rises. The lower side of the exhaust pipe 35 is filled with cooling water, and the water level of the cooling water is the same as the water level of the storage tank 32 when the internal pressure of the cooling water tank 33 is not particularly high. The upper side of the exhaust pressure pipe 35 is filled with air. And if the drinking water stored in the other storage tank 32 is filtered by the hollow fiber membrane module 18, and the cooling water newly stored in the cooling water tank 33 increases, the internal pressure in the said cooling water tank 33 will rise. . At this time, in the exhaust pressure pipe 35, the water level of the cooling water filled in the lower side rises by the internal pressure increased in the cooling water tank 33, and the upper air is discharged to the air layer 43 of the other storage tank 32. . Furthermore, in the other storage tank 32, air can be discharged to the outside via the external communication portion 34, thereby preventing an increase in pressure in the other storage tank 32. Can do. As a result, the exhaust pipe 35 can relieve pressure fluctuations in the cooling water tank 33.

  In addition, the hot water tank 16 is provided with a supply pipe 29 for allowing normal temperature drinking water to be supplied from another storage tank 32. The supply pipe 29 has an inlet opening 29 a that opens to the other storage tank 32, and an outlet opening 29 b that opens to the bottom side of the hot water tank 16.

(Embodiment 3)
The drinking water dispenser according to the third embodiment will be described below with reference to FIG. FIG. 5 is a schematic cross-sectional view illustrating the entire configuration of the drinking water dispenser according to the third embodiment. In addition, about the component which has the same function as the drinking water dispenser of the said Embodiment 1 and 2, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIG. 5, the drinking water dispenser 40 of the present embodiment is connected to the other storage tank 32 and the cooling water tank 33 by a supply pipe 42 as compared with the drinking water dispenser 30 of the second embodiment. The difference is that the hollow fiber membrane module 18 is provided in the supply pipe 42.

  In the supply pipe 42, an inlet opening 42 a is provided in a water layer portion where normal temperature drinking water is stored in the other storage tank 32. The hollow fiber membrane module 18 can be provided at any position of the supply pipe 42. Thereby, the cooling water stored in the cooling water tank 33 can be filtered in advance by the hollow fiber membrane module 18 to remove or reduce germs. Moreover, since the hollow fiber membrane module 18 is provided with the hollow fiber membrane 22 which has hydrophilicity and is not graft-polymerized as described above, it prevents the taste and smell from being given to drinking water. doing.

  In addition, the cooling water supply pipe 17 is provided with a pump 27, whereby the cooling water can be pumped at a flow rate higher than a certain level. However, the present embodiment is not limited to this mode, and cooling water can be collected without installing the pump 27. Further, the pump 27 may be provided in the supply pipe 42. In this case, the pump 27 may be provided either upstream or downstream of the hollow fiber membrane module 18.

(Embodiment 4)
The drinking water dispenser according to the fourth embodiment will be described below. FIG. 6 is a schematic cross-sectional view illustrating the entire configuration of the drinking water dispenser according to the fourth embodiment. In addition, about the component which has the same function as the drinking water dispenser of the said Embodiment 1-3, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  As shown in FIG. 6, the drinking water dispenser 50 of the present embodiment is different from the drinking water dispenser 10 of the first embodiment in that the hollow fiber membrane module 18 is provided in the water intake pipe 20.

  In the present embodiment, the hollow fiber membrane module 18 can be provided at an arbitrary position of the intake pipe 20. Thereby, the drinking water stored in the normal temperature water layer 14a, the cooling water stored in the cooling water tank 33, and the hot water stored in the hot water tank 16 are filtered in advance by the hollow fiber membrane module 18 to remove or reduce germs. Can be made. Moreover, since the hollow fiber membrane module 18 is provided with the hollow fiber membrane 22 which has hydrophilicity and is not graft-polymerized as described above, it is possible to transfer taste and smell to drinking water. It is preventing.

  In the present embodiment, the case where the hollow fiber membrane module 18 provided in the cooling water supply pipe 17 is provided in the water intake pipe 20 in the drinking water dispenser 10 of the first embodiment has been described. It is not limited to. For example, the present invention can be applied to the drinking water dispenser 30 of the second embodiment and the drinking water dispenser 40 of the third embodiment by providing the hollow fiber membrane module 18 in each water intake pipe 20.

  Hereinafter, preferred embodiments of the present invention will be described in detail by way of example. However, materials and the like described in the following examples do not limit the scope of the present invention only to those unless otherwise limited.

Example 1
In this example, filtration of mineral water (trade name; natural water of AW Water North Alps, manufactured by Air Water Co., Ltd.) filled in the bottle 11 was performed using the experimental apparatus shown in FIG. . That is, a bottle 11 filled with mineral water and a container 51 for receiving filtered water obtained by filtering the bottle 11 were connected by a supply pipe 52, and a hollow fiber membrane module 50 was provided in the supply pipe 52. A pump 27 was also installed upstream of the hollow fiber membrane module 50. Further, as the hollow fiber membrane module 50, a polysulfone-based hollow fiber membrane module (model number: AWPSF01, manufactured by KITZ Micro Filter Co., Ltd.) having the shape, effective membrane area and pore size shown in Table 1 below was used.

  Filtration using the hollow fiber membrane module 50 was performed as follows. That is, normal temperature mineral water (20 to 25 ° C.) stored in the bottle 11 was pumped using the pump 27, filtered through the hollow fiber membrane module 50, and the first 200 ml of filtered water was collected.

  Next, TOC (Total Organic Carbon) concentration analysis was performed on the collected filtrated water, and the organic components eluted from the hollow fiber membrane module 50 were confirmed.

  Specifically, first, 2.125 g of potassium hydrogen phthalate was dissolved in purified water to prepare a 1 L phthalic acid solution, which was used as a total organic carbon standard stock solution (1 ml of this solution contains 1 mg of carbon). Further, the phthalic acid solution as the total organic carbon standard stock solution was further diluted 100 times with purified water, and the obtained phthalic acid solution was used as the total organic carbon standard solution (1 ml of this solution was 0.01 mg of carbon. including).

  Next, the total organic carbon standard solution was taken stepwise into 4 or more volumetric flasks, and purified water was added to each to make a fixed amount. Further, correction corresponding to the calibration curve was performed according to the correction method of the following apparatus.

  A certain amount of filtered water and raw water before filtration was measured with a total organic carbon quantification apparatus (model number: TOC-VCSH, manufactured by Shimadzu Corporation), and the concentration of total organic carbon in the test water was calculated. The results are shown in Table 2 below.

  Moreover, the sensory test was also implemented about the filtered water sampled as mentioned above. The sensory test was conducted to determine whether taste-induced taste and odor derived from the resin of the hollow fiber membrane module 50 are generated in the filtered water.

  That is, 21 males and females in their 20s to 50s were allowed to taste sampled room temperature filtered water to evaluate whether the taste and smell were uncomfortable. The results are shown in Table 3 below.

(Comparative Example 1)
In this comparative example, as the hollow fiber membrane module 50, a polyethylene-based hollow fiber membrane module having the shape, effective membrane area and pore size shown in Table 1 below was used. Moreover, as a constituent material of the hollow fiber membrane, a polyethylene represented by the following chemical formula and made hydrophilic by graft polymerization was employed. Other than that was carried out similarly to the said Example 1, and filtered mineral water with which the bottle 11 was filled.

  Further, in the same manner as in Example 1, TOC concentration analysis and sensory test were also conducted. The results are shown in Tables 2 and 3 below. However, the sensory test was conducted on 20 men and women aged 20 to 50.

(result)
As can be seen from Table 2, the polyethylene-based hollow fiber membrane module of Comparative Example 1 has a TOC concentration of 2.26 mg / L, whereas the polysulfone-based hollow fiber membrane module of Example 1 has a TOC concentration of 0.2. It was 63 mg / L, and it was confirmed that elution of organic components was suppressed.

  As can be seen from Table 3, in the polysulfone-based hollow fiber membrane module of Example 1, the number of panelists who had an uncomfortable taste was 4 out of 21, and in the polyethylene-based hollow fiber membrane module of Comparative Example 1, Nineteen people answered that the taste was uncomfortable. About this result, the result of having performed a significant difference test (Statcel3 software (made by OSM Publishing Co., Ltd., calculated by Fisher's exact method)), p value is p <0.001, Example 1 It can be said that the results of Comparative Example 1 are statistically significant.

  From this, mineral water (filtered water) passed through a polysulfone-based hollow fiber membrane module that has not been subjected to graft treatment has a taste transfer and a smell that is less than mineral water passed through a polyethylene-based hollow fiber membrane module. It was confirmed that there were few organic components estimated to be the source.

10, 30, 40, 50 Drinking water dispenser 11 Bottle 12, 31 Main body part 13 Water outlet 14 Reservoir 14a Normal temperature water layer 14b Cooling water layer 15 Drinking water 16 Hot water tank 17 Cooling water supply pipes 18, 28, 50 Hollow fiber membrane Module 19 Water inlet 20 Intake pipe 21 Separator 22 Hollow fiber membrane 23 Sealing material 24 Cooling water inlet 25 Filtration water outlet 26 Main case 27 Pump 28 Hot water supply pipe 29 Supply pipe 29a Inlet opening 29b Outlet opening 32 Reservoir 33 Cooling water tank 34 External communication part 35 Exhaust pressure pipe 36 Water inlet 42 Supply pipe 42a Inlet opening 43 Air layer 51 Container 52 Supply pipe

Claims (6)

A bottle for supplying drinking water;
The bottle can be detachably installed, and includes at least a main body that discharges the drinking water from a water outlet,
The main body portion is provided with at least one hollow fiber membrane module for filtering the drinking water before water discharge,
The hollow fiber membrane in the said hollow fiber membrane module is a drinking water dispenser which is hydrophilic and is not graft-polymerized.   The drinking water dispenser according to claim 1, wherein the hollow fiber membrane is a polysulfone-based hollow fiber membrane having hydrophilicity. The main body is
A storage tank for storing drinking water supplied from the bottle, storing the drinking water in the upper layer at room temperature, and cooling and storing in the lower layer;
Located below the storage tank, a hot water tank for storing drinking water supplied from the storage tank at a high temperature,
A cooling water supply pipe for connecting the outlet and the storage tank, and flowing the cooled drinking water stored in the storage tank;
The drinking water dispenser according to claim 1 or 2, wherein the hollow fiber membrane module is provided at an arbitrary position of the cooling water supply pipe and filters the cooling water supplied from the storage tank. The main body is
Other storage tanks for storing drinking water supplied from the bottle at room temperature,
A cooling water tank that is located below the other storage tank and cools and stores the drinking water supplied from the other storage tank;
A hot water tank located at a lower side than the cooling water tank and storing the drinking water supplied from the other storage tank at a high temperature;
The drinking water according to claim 1 or 2, wherein the hollow fiber membrane module is provided between the other storage tank and the cooling water tank, and filters the drinking water supplied from the other storage tank. Dispenser. The main body is
Other storage tanks for storing drinking water supplied from the bottle at room temperature,
A cooling water tank that is located below the other storage tank and cools and stores the drinking water supplied from the other storage tank;
Located below the cooling water tank, a hot water tank for storing drinking water supplied from the other storage tank at a high temperature,
A supply pipe for supplying room-temperature drinking water stored in the other storage tank to the cooling water layer;
The drinking water dispenser according to claim 1 or 2, wherein the hollow fiber membrane module is provided at an arbitrary position of the supply pipe and filters normal temperature drinking water supplied from the other storage tank. . The main body is
A water intake pipe for taking drinking water from the bottle;
The drinking water dispenser according to claim 1 or 2, wherein the hollow fiber membrane module is provided at an arbitrary position of the water intake pipe and filters drinking water taken from the bottle.

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