JPH1085590A - Water purifying filter structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a filter structure sanitarily for a long period of time and control proliferation of various bacteria in water by laminating a porous material layer composed of zeolite carrying antibacterial metallic ions and a binder and another porous material layer composed of active carbon carrying antibacterial metallic ions. SOLUTION: A porous material A is composed of a textile containing zeolite on which antibacterial metallic ions are carried in a binder, and a number of hollows are formed on the surface and also inside of the textile. A porous material B is composed of active carbon carrying antibacterial metallic ions. As the antibacterial metallic ions, silver, zinc, copper, cobalt or the like is used. A filter structure is filled with seven layers of the laminated state, namely layers of a first antibacterial polyester non-woven filter 10, a second antibacterial polyester non-woven filter 11, a porous material A, a third antibacterial polyester non-woven filter 12, a porous material B, a fourth antibacterial polyester non-woven filter 13 and a fifth antibacterial polyester non-woven filter 14 laminated in the above-referred order from the top downward in a filter cylinder 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purification filter structure used for a water purifier or the like.

[0002]

2. Description of the Related Art In recent years, in urban areas, a large amount of chemicals is used for water purification because rivers that serve as water sources for water supply are significantly contaminated by water. Moreover, in order to supply purified water to a household faucet in a sterilized state, addition of chlorine or the like is required. For this reason, in each household, a simple water purifier of a type attached to a water tap has been spreading for the purpose of removing odor and trihalomethane by a chemical treatment.

[0003] However, the fine impurities dissolved in the purified water cannot be almost removed by the simple water purifier as described above, and they are directly used for drinking and ingested into the body. In Japan, there is no problem because the water is soft and of good quality.However, in Europe, the United States and neighboring countries in Asia, the quality of water is poor. Reverse osmosis water purifiers that can be used are widely used.

FIG. 4 shows an example of the above reverse osmosis membrane water purifier.
In the figure, 1 is a filter tube incorporating a bag made of felt such as polyester fiber, 2 is a filter tube filled with granular activated carbon, 3 is a filter tube incorporating a reverse osmosis membrane, and 4 is a water storage tank. The pipe 5 is connected to a drain (not shown). According to this reverse osmosis membrane water purifier, the water taken in from the tap of the tap is passed through the first filter tube 1 → the activated carbon filter tube 2 → the reverse osmosis membrane filter tube 3 in order to remove even fine impurities. To obtain water close to pure water.

[0005]

However, since the reverse osmosis membrane water purifier has a small amount of water flow and it is difficult to immediately extract a desired amount of water, the filtered water is gradually accumulated in the water storage tank 4. It is supposed to be. Therefore, the filtered water tends to stay in the water storage tank 4 for a long time. However, since the filtered water has no sterilizing ability due to removal of a sterilizing agent or the like, there is a problem that it becomes a hotbed where germs can be propagated with time, and is rather unsanitary.

The present invention has been made in view of such circumstances, and can be used hygienically for a long period of time.
The present invention relates to a water purification filter structure capable of suppressing the propagation of various bacteria in water.

[0007]

In order to achieve the above object, a water purification filter structure of the present invention comprises a first layer mainly composed of a porous material (A) described below, and a porous material described below. The second layer mainly composed of (B) is stacked directly or via another layer. (A) A porous material comprising a binder and a zeolite carrying an antibacterial metal ion. (B) A porous material made of activated carbon carrying antibacterial metal ions.

[0008] In the present invention, the term "consistantly" is intended to include the case where it is composed solely.

[0009]

Next, an embodiment of the present invention will be described.

[0010] The water purification filter structure of the present invention comprises a porous material A comprising zeolite carrying antibacterial metal ions and a binder, and a porous material B comprising activated carbon carrying antibacterial metal ions. It is a combination.

The porous material A is made of a cloth containing zeolite carrying an antibacterial metal ion in a binder, and has many random cavities formed on the surface and inside thereof. The shape is usually an aggregate of substantially spherical or granular particles. However, there is no problem even if the above particles are bound in a state of being partially in contact with each other and formed into a lump (a columnar shape, a prismatic shape, or the like) that can be loaded into the cylinder of the water purifier.

As the binder used for the porous material A, clay, synthetic resin, fiber and the like can be used. These may be used alone or in combination of two or more. As the above clay, kaolin, bentonite, acid clay,
Activated clay and the like, and examples of the synthetic resin include polyester, polyamide, cellulose, polyethylene, polypropylene, acrylic resin, acrylonitrile-butadiene-styrene copolymer (ABS resin), and the like. Examples of the fiber include those made of the same components as the synthetic resin.

The antibacterial metal ions include:
Silver, zinc, copper, cobalt, etc., alone or 2
Used in combination of more than one species. Among them, silver or zinc is preferred.

As the above-mentioned zeolite, either natural or synthetic products can be used. For example, as natural zeolites, analsin, chabazite, erionite, mordenite and the like are preferable, and as synthetic zeolites, A-type zeolite, X-type zeolite, Y-type zeolite.
Zeolite, high silica zeolite and the like are preferred.
Particularly preferred are the synthetic zeolites A-type zeolite, X-type zeolite, Y-type zeolite, high silica zeolite and natural mordenite.

The porous material A can be obtained by using the above materials, for example, as follows. That is, first, the zeolite supporting the antibacterial metal ion and the clay are combined with water, then formed into granules, and then fired at a temperature of 600 ° C. or lower, whereby the porous material A can be obtained.
Further, zeolite and clay are combined with water, formed into granules, fired at a high temperature, and then an antibacterial metal is carried on the zeolite by an antibacterial metal ion exchange reaction. This also allows the porous material A to be obtained. Further, the porous material A can be obtained by melting the zeolite supporting the antibacterial metal ion and the synthetic resin, spinning out from a nozzle, cutting into a predetermined length, and cutting into a chip shape. Alternatively, in these methods, it is possible to obtain a massive porous material A shaped into a mold by filling and sintering in a mold in a state in which the granules are in contact with each other to some extent, instead of firing in a granular state. .

The particle size of the porous material A thus obtained (when the porous material A is a lump, the particle diameter of each particle before being formed into a lump) is 0.1 to 7 It is preferably set to 0.0 mm, and most preferably set to 0.5 to 3.0 mm. That is, if it is less than 0.1 mm, the particles are too fine and the amount of water passing is extremely small, which is not practical. Conversely, if it exceeds 7 mm, the particles are too coarse and the total contact area with water becomes small, and the antibacterial effect is exhibited. Because it is hard to be done.

As a commercially available product of the porous material A (granular product), there is Bacte Killer KBB103 manufactured by Kanebo.
(Particle size: 1.5-3.5 mm), Bakutekira MBD
E-5013 (particle size: 2.5 to 3.5 mm), Bactequiller cellulose beads (particle size: 2.0 to 3.0 mm) and the like.

On the other hand, in the present invention, the porous material B used together with the porous material A is a conventionally known activated carbon carrying antibacterial metal ions, and its shape is substantially spherical or granular, or It is an aggregate of fibrous particles.
However, similarly to the case of the porous material A, the particles are bound in a state where they are partially in contact with each other, and formed into a lump (a columnar shape, a prismatic shape, or the like) that can be loaded into the cylinder of the water purifier. There is no problem.

Activated carbon used for the porous material B includes:
Coconut shell activated carbon, coal activated carbon, activated carbon fiber, etc., which have been widely used in the past, can be mentioned.

The antibacterial metal ions to be carried on the activated carbon are silver, copper,
Zinc, cobalt and the like can be mentioned, and they are used alone or in combination of two or more.

The porous material B is washed by immersing the activated carbon in an aqueous solution containing an antibacterial metal ion (for example, when silver ions are supported, use an aqueous solution of silver nitrate).
It is easily obtained by drying.

The particle size of the porous material B (when the porous material B is a lump, the particle diameter of each particle before being formed into a lump)
Is preferably set to 0.1 to 3.0 mm,
It is particularly preferable to set the thickness to 0.2 to 0.5 mm. That is, the filter structure for water purification of the present invention is preferably used in combination with a reverse osmosis membrane water purification apparatus, and the reverse osmosis membrane water purification apparatus has a very high probability of dissolving impurities eluted in purified water. It is characterized by maintaining water quality with TDS value (Total Dissolved Solids) of 10 ppm or less. In order to maintain the water quality, it is preferable to set the particle size of the porous material B within the above range.

As a commercially available product of the porous material B (granular product), there is Kuraray Coal T-
S GW (10-32 mesh [particle size 1700-500
μm], 20-42 mesh [particle size 850-350μ
m], 32-60 mesh [particle size 500-250μ
m]).

The filter structure for water purification of the present invention is obtained by using the porous materials A and B in combination.
Exhibits excellent antibacterial action. That is, the porous material A
Since it contains an antibacterial zeolite, it exhibits excellent antibacterial properties and can greatly suppress the growth of various bacteria in purified water. Moreover, the porous material B adsorbs fine particles eluted from the porous material A due to excellent adsorption performance,
It also absorbs trace components of odor and taste. Furthermore, the antibacterial metal ions carried on the porous material B greatly suppress the inhabitation of various bacteria. Therefore, by passing through both layers, excellent antibacterial action is given to water, and the effect can be stably maintained for a long period of time.
In addition, since the antibacterial metal ions gradually elute from the porous material A and the porous material B by passing through the water purification filter structure, the water has antibacterial properties. For this reason, if the water purification filter structure is connected to the downstream side of the reverse osmosis membrane water purifier, and through this, water is stored in the water storage tank, the water storage tank, which has been a problem in the past, Recontamination of water is suppressed, and water can be kept sanitary.

In the filter structure for water purification according to the present invention, the porous material B layer is provided downstream of the porous material A layer because the porous material B layer has excellent adsorption ability. Is preferred. Then, for the layer of the porous material A and the layer of the porous material B, other appropriate filter materials can be used in combination. However, in order not to impair the effects of the porous material A and the porous material B, the ratio of the use of the porous material A and the porous material B is
The volume ratio is preferably set to 20% or less.

Examples of the filter material which can be used in combination with the porous material A and the porous material B include ordinary activated carbon, cellulose beads, granular zeolite, etc., which do not carry antibacterial metal ions.

The porous material A layer and the porous material B
May be directly laminated, or in between, may be laminated via various nonwoven fabric filters, activated carbon particle layers, or the like. Further, the particles of the porous material A and the particles of the porous material B may be directly mixed and used as a one-layer filter. The filter structure for water purification can be used not only in a water purifier, but also in, for example, a column for liquid treatment, or can be used by being provided in the middle of a water supply pipe.

Next, an example of the water purification filter structure of the present invention is shown in FIG. In the drawing, reference numeral 6 denotes a filter tube, into which water is introduced from an upper water inlet 7, flows down an internal filter structure, and is taken out from a lower water outlet 8.

The above filter structure includes, in order from the top, a first antibacterial polyester nonwoven fabric filter 10, a second antibacterial polyester nonwoven fabric filter 11, a porous material A, a third antibacterial polyester nonwoven fabric filter 12, a porous material B, Seven layers of the fourth antibacterial polyester nonwoven fabric filter 13 and the fifth antibacterial polyester nonwoven fabric filter 14 are filled in a laminated state.

The antibacterial polyester nonwoven fabric filters 10 to 14 used at the upper and lower ends of the filter structure for water purification and at the boundary between the porous materials A and B contained zeolite having antibacterial metal ions supported inside the fibers. It is made circular by using fibers, and also has a high antibacterial action against various germs, and has an effect that it is difficult for various germs to propagate in the filter tube 6 in a state where water does not flow for a long time.

As shown in FIGS. 2 and 3, for example, as shown in FIG.
A conventional reverse osmosis membrane water purifier (see FIG. 4) is installed downstream of the reverse osmosis membrane filtration tube 3 to further purify water that has passed through the reverse osmosis membrane filtration tube 3 and supply it to the water storage tank 4. Fulfill.
In FIG. 2, reference numeral 15 denotes an intake port.

Next, examples will be described together with comparative examples.

[0033]

Example 1 As porous material A, Bacte Killer KBB
103 (manufactured by Kanebo Co., Ltd.), as a porous material B, silver activated coconut shell granular activated carbon was used, and a filter structure for water purification having a configuration shown in FIG. 1 (cross-sectional area of layer: 13.9 cm ² , porous material A: porous material) A packing volume ratio of the material B of 70:30) was prepared, and was incorporated in a reverse osmosis membrane water purifier in the same manner as described above. Then, when it was subjected to purification of tap water having a flow rate of 2.5 liters / hour, it was found that an excellent purification effect was exhibited as shown in Tables 1 and 2 below.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

Examples 2 to 11 As shown in the following Tables 3 to 6, the type of the porous material A and the porous material B or the filling volume ratio thereof was changed and the reverse osmosis membrane water purifier was the same as in Example 1. Incorporated in. Then, the water is actually purified under the same conditions as described above, and the water quality (number of germs and TDS) in the water storage tank 4 is initially measured, one month after use, and six months after use.
Value) was measured. The results are shown in Tables 3 to 6 below. In addition, the said germ count showed the total germ count measured using the bio-checker TTC made by Sanai Oil Co., Ltd. The TDS value was measured using a known TDS meter.

[0037]

[Table 3]

[0038]

[Table 4]

[0039]

[Table 5]

[0040]

[Table 6]

[0041]

Embodiment 12 As the layer of the porous material A, a porous material A formed into a cylindrical shape (porosity 40%) was used. Otherwise, it was incorporated in a reverse osmosis membrane water purifier in the same manner as in Example 1.

[0042]

Embodiment 13 As the layer of the porous material B, a porous material B formed into a columnar shape (porosity 70%) was used. Otherwise, it was incorporated in a reverse osmosis membrane water purifier in the same manner as in Example 1.

[0043]

Example 14 In the porous material A layer, granular zeolite was mixed with the porous material A at a volume ratio of 10%. Otherwise, it was incorporated in a reverse osmosis membrane water purifier in the same manner as in Example 1.

[0044]

Embodiment 15 In the layer of the porous material B, coconut shell granular activated carbon was mixed with the porous material B at a volume ratio of 10%. Otherwise, it was incorporated in a reverse osmosis membrane water purifier in the same manner as in Example 1.

[0045]

Embodiment 16 Porous material A and porous material B in filter cylinder 6
Was reversed so that the porous material B layer was on the upstream side and the porous material A layer was on the downstream side. Otherwise, it was incorporated into a reverse osmosis membrane water purifier in the same manner as in Example 1 above.

With respect to Examples 12 to 16, the purifying ability was measured in the same manner as described above. The results are shown in Tables 7 and 8 below.

[0047]

[Table 7]

[0048]

[Table 8]

[0049]

Comparative Example 1 The reverse osmosis membrane water purifier shown in FIG. 4 was used, and water was taken out of the reverse osmosis membrane filtration tube 3 directly into the water storage tank 4.

[0050]

Comparative Examples 2 to 4 The following Tables 9 and 1
The filter material shown in Fig. 0 was filled, and the filter material was incorporated in a reverse osmosis membrane water purifier similar to that in Example 1.

The purification ability of Comparative Examples 1 to 4 was specified in the same manner as described above. The results are shown in Tables 9 and 10 below.

[0052]

[Table 9]

[0053]

[Table 10]

From the above results, it can be seen that the product of the example has excellent sterilizing and antibacterial functions as compared with the product of the comparative example and can stably supply water of good water quality for a long period of time.

[0055]

As described above, the filter structure for water purification of the present invention comprises a special porous material A made of zeolite carrying antibacterial metal ions and activated carbon carrying antibacterial metal ions. Since it is combined with the special porous material B, it is possible to greatly suppress the propagation of various bacteria in the water purifier. Moreover, since the antibacterial metal ions contained in the porous materials A and B gradually elute into the passing water to impart antibacterial properties, the water stays on the downstream side, for example, in a water storage tank for a long time. Even in such a case, there is an effect that the quality of the water is well maintained. Therefore, an excellent effect can be obtained by using in combination with a reverse osmosis membrane water purifier, which has conventionally been a problem that various bacteria easily propagate.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a filling structure of a water purification filter structure according to the present invention.

FIG. 2 is a side view of an apparatus in which the filter structure for water purification is incorporated in a reverse osmosis membrane water purifier.

FIG. 3 is a view taken along the line AA 'in FIG.

FIG. 4 is a configuration diagram illustrating an example of a reverse osmosis membrane water purifier.

[Explanation of symbols]

 A, B Porous material

Claims (9)

[Claims] 1. A first material mainly composed of a porous material (A) described below.
And a second layer mainly composed of the following porous material (B) are laminated directly or via another layer. (A) A porous material comprising a binder and a zeolite carrying an antibacterial metal ion. (B) A porous material made of activated carbon carrying antibacterial metal ions. 2. The water purification filter according to claim 1, wherein a volume ratio of the first layer and the second layer is set to be (first layer / second layer) 9/1 to 2/8. Structure. 3. The liquid supply apparatus according to claim 1, wherein the first layer is provided on an upstream side of the liquid passage, and the second layer is provided on a liquid passage downstream of the first layer. The filter structure for water purification according to the above. 4. The water purifying filter structure according to claim 1, wherein the water purifying filter structure is used for purifying a liquid that has passed through the reverse osmosis membrane filter structure. 5. The binder in the porous material (A),
The filter structure for water purification according to any one of claims 1 to 4, wherein the filter structure is at least one binder selected from the group consisting of clay, synthetic resin, and fiber. 6. The method according to claim 1, wherein the clay is kaolin, bentonite,
The filter structure for water purification according to claim 5, which is at least one clay selected from the group consisting of acid clay and activated clay. 7. The water purification method according to claim 5, wherein the synthetic resin is at least one synthetic resin selected from the group consisting of polyester, polyamide, cellulose, polyethylene, polypropylene, acrylic resin, and acrylonitrile-butadiene-styrene copolymer resin. Filter structure. 8. The water purifying water according to claim 5, wherein said fiber is at least one fiber selected from the group consisting of polyester, polyamide, cellulose, polyethylene, polypropylene, acrylic resin and acrylonitrile-butadiene-styrene copolymer resin. Filter structure. 9. The filter structure for water purification according to claim 1, wherein the antibacterial metal is at least one metal selected from the group consisting of silver, copper, zinc and cobalt.