JP3537503B2 - Water purification equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification device.

[0002]

2. Description of the Related Art In recent years,
With the advancement of industrial activities and diversification of lifestyles, various chemical substances have been detected in environmental water. These various chemical substances react with chlorine injected for the purpose of sterilization at a water purification plant to generate trihalomethane, a carcinogenic substance, which has become a major social problem in recent years.

[0003] From the viewpoint of hygiene, it is specified that tap water has a residual chlorine content of 0.1 ppm or more in the supply terminal. Particularly in the summer, there is a problem that a strong scent of smell gives discomfort. Therefore, safe water,
The social demands for delicious water have increased, and activated carbon has been widely used in household water purifiers for removing trihalomethane, chlorine odor and the like in tap water.

[0004] The bacteria in the tap water are not completely killed by the chlorine-based germicide added to the tap water, and a certain amount of bacteria is present in the tap water. The growth of bacteria is suppressed. However, when the residual chlorine content in tap water is adsorbed and removed on activated carbon using a water purifier using activated carbon, the chlorine content remaining in the water purifier is removed when the water flow to the water purifier is once stopped. There is a big problem that bacteria proliferate in the tap water after the spill.

In order to solve such problems, water purifiers using antibacterial activated carbon have been used. Antibacterial activated carbon is obtained by treating activated carbon with a soluble salt such as silver having a bactericidal action, or by vapor-depositing a metal having a bactericidal action on the activated carbon surface. The bactericidal action is exhibited by the elution of the compound.

It is well known that trace amounts of silver ions have antibacterial properties. However, the direct use of water-soluble or poorly water-soluble silver salts in drinking water is not desirable for health reasons, and the U.S. Public Health Service regulates the silver ion concentration in drinking water to 50 ppb or less.

[0007] For this reason, Japanese Patent Publication No. 52-38665 discloses a technique using activated carbon in which a silver nitrate solution is added to support silver, and Japanese Patent Application Laid-Open No. 2-160707 discloses a technique in which silver is supported by sputtering. A technique using activated carbon, and Japanese Patent Application Laid-Open No. 4-12012 describes a technique using a substance in which a bactericidal metal such as silver and activated carbon are physically fixed to the surface of a core substance. The problem is that chlorine in tap water is activated on the surface of activated carbon, and the activated chlorine reacts with silver metal to form silver chloride and increases the amount of eluted silver. There was also a problem that the antibacterial action was lost in a relatively short time due to the rapid release rate of the lipase.

On the other hand, in order to prevent an adverse effect on the human body due to elution of a large amount of metal ions into tap water, a layer of a chelating resin is provided next to a layer of antibacterial activated carbon, and the metal ions eluted from the antibacterial activated carbon are removed. A water purifier that is adsorbed by a chelating resin and removed from tap water has also been proposed (Japanese Utility Model Application Laid-Open No. 60-132897). However, bacteria existing in tap water are not completely killed immediately after metal ions elute from the antibacterial activated carbon.If a layer of chelating resin is provided next to a layer of antibacterial activated carbon, The metal ions eluted from the water are adsorbed and removed by the chelating resin in a very short time, so that sufficient sterilization is not performed. It was hard to say that the growth of bacteria could be prevented.

The present invention has been made in view of the above points,
Provided is a water purification device capable of effectively preventing the growth of bacteria in water retained in a water purifier and solving various problems caused by a large amount of bactericidal metal ions eluted into tap water. The purpose is to do.

[0010]

That is, the water purification apparatus of the present invention adsorbs germicidal metal ions of less than 80% of the saturated adsorption amount.
Bactericidal resin layer of the chelate resin, active carbon layer, flat
Water is discharged from the inlet side through a porous filter with a uniform pore size of 1μ or less.
Side by side .

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a water purifier cartridge as one embodiment of the water purifier of the present invention, 2 denotes a water inlet connected to a water inlet of a water purifier (not shown), and 3 denotes a water outlet of the water purifier. A water outlet to be connected, and this replacement cartridge is configured to be attachable to and detachable from the water purifier by the same known means as a conventional water purifier replacement cartridge.

In a filling space 12 provided on the water inlet 2 side of the cartridge 1, a layer 4 of a bactericidal resin made of a resin carrying a metal and having a bactericidal property, and a layer 5 of activated carbon are provided. On the water outlet 3 side, a pre-filter 6 and a porous filter 7 are provided from the water inlet side to the water outlet side. In the drawing, reference numeral 8 denotes a partition for partitioning the germicidal resin layer 4 and the activated carbon layer 5, 9 denotes a holding plate on the upper surface side of the germicidal resin layer 4, and 10 denotes a support. The partition body 8, the holding plate 9, and the support body 10 are made of a material that allows water to permeate but does not allow germicidal resin or activated carbon to pass therethrough. For example, a nonwoven fabric, a wire mesh, a plastic mesh, or the like may be used alone or in an appropriate combination. Used.

As the resin having a bactericidal property, a resin in which a bactericidal metal ion is adsorbed on a functional group of a chelate resin, a porous resin containing a metal powder, or the like is used. Examples of the resin base of the chelate resin include a styrene-divinylbenzene copolymer, an epoxy resin, a phenol resin, a vinyl chloride resin, an acrylic resin, a vinylidene chloride resin, a urea resin, and the like. It can also be used.

The functional group of the chelating resin is preferably an amino acid group, an iminoacetic acid group, an iminodiacetic acid group, an iminopropionic acid group, an iminodipropionic acid group, etc., and a chelate containing two or more of these functional groups It may be a resin. These chelate resins may be porous.

The metal which binds to the above chelate resin to form a germicidal chelate resin includes zinc, copper, silver, gold, and the like.
Platinum is mentioned. The germicidal chelating resin may be one in which one of these metals is adsorbed or one in which two or more of these metals are adsorbed.

In the present invention, as the bactericidal chelating resin, a resin adsorbing a metal ion of less than 80% of the saturated adsorption amount is used . When a chelate resin to which metal ions of less than 80% of the saturated adsorption amount are adsorbed is used, the concentration of metal ions eluted from tap water into tap water can be easily reduced to a safety standard value or less. Since the amount of metal ions eluted from the germicidal resin also depends on the quality of tap water (the type and concentration of ions present in tap water), metals that elute in tap water even if the water quality is different In order to ensure that the ion concentration can be kept below the safety standard value, it is preferable that the bactericidal chelate resin adsorbs metal ions of less than 40% of the saturated adsorption amount. Also, when the amount of metal adsorption becomes extremely small, the bactericidal effect decreases,
1% of the saturated adsorption amount because the persistence of the bactericidal effect decreases
It is preferable that the above metals are adsorbed, and
% Is more preferable.

[0018]

[0019]

[0020]

[0021]

[0022]

In the present invention, the activated carbon used for the activated carbon layer 5 is not particularly limited, but any commercially available liquid-phase activated carbon can be used regardless of its granularity or powder. The water purification device of the present invention comprises a layer 4 of a bactericidal resin,
With the configuration in which water is passed in the order of the activated carbon layer 5, the amount of metal ions eluted from the bactericidal resin layer 4 of the activated carbon into water is not excessively increased, and the bactericidal action can be exhibited. Serves as a buffer to control that the amount is always eluted in water.

The water that has passed through the germicidal resin layer 4 and the activated carbon layer 5 is pre-filtered by a pre-filter 6, and then passes through a porous filter 7, where the germicidal metal ion Bacterial debris, rust, fine suspended matter, etc., killed by the action of
It is flooded from. The pre-filter 6 is not particularly limited as long as it is a porous body, but it is preferable to use a porous body having an average pore size of 10 to 150 μm.

The porous filter 7 in the present invention, are used the following on either Rataira Hitoshiana径1μ filtration performance of fine material in the water <br/> in that less than 80% of the saturated adsorption amount as a bactericide resin When the chelate resin to which the metal ion is adsorbed is used, if the average pore size of the porous filter is 1 μm or less, the effect of removing fine substances is high, and the effect of removing bacteria is also high. As the porous filter 7, a membrane filter (MF), an ultra filter (UF), or the like is used. Examples of the material of the porous filter 7 include nylon, polypropylene, polyethylene, polysulfone, polyacrylonitrile, polyethersulfone, polytetraethylene, polyvinylidene fluoride, cellulose acetate, polyvinylidene chloride, and chlorinated polyethylene.

In the present invention, it is not always necessary to provide the pre-filter 6, but before passing through the porous filter 7, substances having a size that can be filtered by the pre-filter 6 are removed by pre-filtering with the pre-filter 6. This is preferable because the porous filter 7 is less likely to be easily clogged, and the life of the porous filter 7 is greatly extended.

As shown in FIG. 1, the exchange cartridge 1 has a water inlet 2, a water outlet 3, and a substrate 11 of the water outlet 3 which can be removed by a screw structure 13 or the like. The quality filters 7 are preferably configured to be replaceable, but may be of a disposable type. The replacement cartridge for water purifier is used by being attached to a water purifier attached to a water supply terminal, and exhibits excellent effects in a wide water flow speed range of SV = 120 to 10,000.

In the above-described embodiment, the replacement cartridge mounted on the water purifier has been described. However, the water purifier itself may be configured as described above. In this case, it is preferable that each of the sterilizing resin, the activated carbon, the pre-filter 6 and the porous filter 7 has a replaceable structure, but a simple structure of a disposable water purifier can also be used. INDUSTRIAL APPLICATION This invention can be used as a household water purifier, a commercial water purifier, a cup-type vending machine water purifier, etc.

Hereinafter, the present invention will be described in more detail with reference to specific examples.

Examples 1 to 7 50 ml of a bactericidal resin shown in Table 1 and activated carbon (Takeda granular Shirasagi Wc 28 to 80 mesh) were placed in the filling space (diameter 25 mm) on the water inlet side of the water purifier cartridge having the structure shown in FIG. 10 ml, filled with a sterilizing resin layer having a thickness of 100 mm and a layer of activated carbon having a thickness of 20 mm in order from the water inlet side. . . It was provided with a partition body of mm. As the porous filter, a membrane filter (manufactured by Advantech: MCS-045-E10S: pore size 0.45 μ) was used. This water purifier cartridge was attached to a water purifier, and tap water containing 1 × 10 ⁶ intestinal bacteriophilic bacteria was passed at a water passing speed shown in Table 2 for 20 minutes. One milliliter of water flowing out of the water outlet of the water purifier was sampled, and the viable cell count after culturing on a standard agar medium at 36 ° C. for 24 hours was examined (bacterial culture test). Table 2 shows the results. Table 2 also shows the results of analysis of the metal ion concentration in the effluent from the water purifier by atomic absorption spectrometry.

[0031]

[Table 1]

[0032]

[Table 2]

After the water was passed through the water purifier for 20 minutes, the water was stopped once, kept at room temperature for 12 hours, then water was passed again under the same conditions, and 1 ml of water flowing out of the water purifier immediately after the water flow was resumed. Was sampled and a bacterial culture test was performed in the same manner as described above (bacterial culture test). The results are also shown in Table 2.

COMPARATIVE EXAMPLE 1 The same structure as in each of the above Examples was used except that a chelate resin having the same resin structure as that used in Example 1 and having a saturated amount of silver ion adsorbed was used without using activated carbon. Using the purified water purifier, tap water was passed under the same conditions as in Example 1. One milliliter of water flowing out of the outlet of the water purifier was sampled 10 minutes after passing the water, and subjected to a bacterial culture test using a standard agar medium in the same manner as in the above example. As a result, no general bacteria were detected. However, in the case of this water purifier, the silver ion concentration in the effluent was 60 ppb, exceeding the US tap water standard.

Comparative Example 2 Antibacterial activated carbon surface-treated with silver was used in place of the germicidal resin used in each of the above Examples, and instead of activated carbon, a chelating resin (to adsorb metal ions of the germicidal resin of Example 1) was used. The test was carried out using the same water purifier as in each of the above Examples except that the water purifier was not used. The water purifier was good in the bacterial culture test, and no general bacteria were detected. However, in the bacterial culture test, the number was 2 × 10 ² .

[0036]

[0037]

[0038]

[0039]

As described above, the water purification apparatus of the present invention adsorbs germicidal metal ions of less than 80% of the saturated adsorption amount.
A layer of a bactericidal resin made of a chelated resin, a layer of activated carbon, and a porous filter having an average pore size of 1 μm or less from the water inlet side.
According to the water purification device of the present invention, by sequentially arranging the components on the water discharge side, it is possible to remove fine substances such as residual chlorine content and trihalomethane in tap water and rust, and also remove chlorine content in the water purifier. Even if remaining tap water remains, the germicidal metal ions eluted from the germicidal resin into the tap water effectively prevent the growth of bacteria and may cause unpleasant odor or carcinogenicity. It is possible to obtain purified water free of contamination by substances or bacteria. The water purification device of the present invention is
By using a chelating resin adsorbing a metal of less than 80% of the saturated adsorption amount as a resin having a bactericidal property, a sufficient bactericidal effect is exerted on the amount of bactericidal metal ions eluted in water, and extra sterilization is performed. can sex metal ions to control the <br/> optimum value so as not to flow out. Or bactericidal tree
With use of the chelate resins having adsorbed less than 80% of the metal of the saturation adsorption amount as fat, by using the following pore diameters 1μ as porous filter, it is effectively removed of fine material, even the removal of bacteria Has an effect that can be.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of a water purifier replacement cartridge as one embodiment of the water purifier of the present invention.

[Explanation of symbols]

1 Replacement cartridge for water purifier 4 Layer of germicidal resin 5 Layers of activated carbon 7. Porous filter

Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI C02F 1/50 C02F 1/50 531E 531F 531S 531T 531U 540 540F 550 550B 560 560B 560E (72) Inventor Kazuo Hosoda 4-chome Horikiri, Katsushika-ku, Tokyo No. 1 Miyoshi Oil & Fats Co., Ltd. (72) Inventor Masatoshi Yoshida 4-66-1, Horikiri, Katsushika-ku, Tokyo Miyoshi Oil & Fats Co., Ltd. (72) Inventor Takashi Ogawa 4-66-1, Horikiri, Katsushika-ku, Tokyo No. Miyoshi Oil & Fat Co., Ltd. (72) Kazumi Kitani 4-66-1, Horikiri, Katsushika-ku, Tokyo Miyoshi Oil & Fat Co., Ltd. (72) Sachiko Furukawa 4-66-1, Horikiri, Katsushika-ku, Tokyo Miyo (56) References JP-A-60-118285 (JP, A) JP-A-55-89336 (JP, A) JP-A-6-126278 (JP, A) JP-A-55-62906 (JP JP, A) Japanese Utility Model 3-11497 (JP, U) (58) Field surveyed (Int. . ^7, DB name) C02F 1/28 C02F 1/44 C02F 1/42 C02F 1/50

Claims (1)

(57) [Claims] (1) A bactericidal metal (B) having less than 80% of a saturated adsorption amount.
Bactericidal resin layer of adsorbed chelating resin on active carbon layer, the average pore diameter is less porous filter 1μ water inlet
A water purification apparatus characterized by being sequentially arranged from a side to a water discharge side .