JPH0899080A - Packing material for filtering - Google Patents

Abstract

PURPOSE: To obtain a packing material for filtering developing excellent clarifying capacity and ensuring a stable filtering flow rate over a long period of time by laminating a high density nonwoven fabric layer on an activated carbon bed so as to arrange the same in a filtering direction. CONSTITUTION: A high density nonwoven fabric layer 2 is laminated and arranged to the outer periphery of a cylindrical activated carbon bed 1 in a close contact state. The activated carbon bed 1 is constituted of molded fibrous activated carbon and the high density nonwoven fabric layer 2 is obtained by the compression processing of nonwoven fabric produced from a nylon fiber and a polyester fiber. An antibacterial material obtained by bonding a silver ion to synthetic inorg. insoluble matter such as zeolite is uniformley dispersed in the activated carbon bed 1 and the high density nonwoven fabric layer 2 so that the content of silver is 0.05-1.0%. By this constitution, a large quantity of suspended matter can be collected at the interface of the activated carbon bed 1 and the nonwoven fabric layer 2 by the filtering resistance difference between them.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a filler for filtration which is incorporated into a water purifier or the like to remove free chlorine and organic matter in raw water, and specifically, fine granular activated carbon, granular activated carbon, molded fiber activated carbon, etc. And an activated carbon layer consisting of

[0002]

2. Description of the Related Art In recent years, in water purifier technology, in addition to the free chlorine / organic matter removing ability for removing free chlorine and organic matter, a turbidity removing ability for removing suspended matter has been required. . Conventionally, a combination of an activated carbon layer and a hollow fiber membrane is known as a filler for filtration that satisfies such requirements.

[0003]

However, the above-mentioned conventional technique has the following disadvantages due to the use of the hollow fiber membrane although it has the turbidity removing ability.

Since the hollow fiber membrane is a filtration membrane in the microfiltration region, a slight change in water quality causes rapid clogging of the hollow fiber membrane. In addition, the hollow fiber membrane contains not only suspended solids but also raw water. The organic matter that is generated and the bacteria that have abnormally grown due to the organic matter cause clogging, and as a result, the filtration flow rate is reduced in a short period of time. Once the hollow fiber membrane is clogged, even if it is washed, it is not possible to recover the filtration flow rate by eliminating the clogging, and in order to secure the filtration flow rate, replacement is required every time the filtration flow rate decreases. As a result, maintenance costs were high.

Further, since the hollow fiber membrane cannot provide a large filtration flow rate per unit time, it is necessary to increase the membrane area in order to secure the filtration flow rate required by the water purifier or the like, and as a result, it is expensive. In addition to requiring a large amount of hollow fiber membranes, the initial cost is high, and a large space is required for installing the hollow fiber membranes, which may cause an impractical situation when the water purifier is downsized.

[0006] Further, although the hollow fiber membrane makes it possible to filter and capture live bacteria in raw water to obtain aseptic purified water, it is unavoidable that water quality is deteriorated due to off-flavor and off-odor as a by-product of the captured live bacteria.

A first object of the present invention is to provide a filtration filler capable of ensuring a stable filtration flow rate for a long period of time while exhibiting an excellent turbidity removing ability. The purpose of No. 2 is to provide a filler for filtration which can sterilize purified water without causing deterioration of water quality.

[0008]

A feature of the filtration filler according to the first aspect of the present invention is that the high-density nonwoven fabric layer is laminated on the activated carbon layer in the filtration direction.

According to a second aspect of the present invention, the filler for filtration according to the second aspect of the present invention is characterized in that, in the first aspect of the present invention, a silver ion is bonded to a synthetic inorganic insoluble material in each of the activated carbon layer and the high density nonwoven fabric layer. The antibacterial material or the antibacterial material obtained by impregnating a synthetic inorganic insoluble material with a silver compound is uniformly dispersed in an amount such that the silver content in the activated carbon layer and the high density nonwoven fabric layer is 0.05 to 1.0%. It is in.

According to a third aspect of the present invention, the filtering filler according to the third aspect is characterized in that, in the first aspect, the antibacterial material obtained by binding silver ions to the synthetic inorganic insoluble material or the silver compound to the synthetic inorganic insoluble material. The antibacterial material impregnated with is dispersed evenly in the activated carbon layer in an amount that makes the silver content of the activated carbon layer 0.05 to 1.0%, and an antibacterial material or a synthetic inorganic insoluble material bound with silver ions An antibacterial material obtained by impregnating an inorganic insoluble material with a silver compound was used to reduce the silver content of the constituent fibers of the high density nonwoven fabric layer to 0.
It is contained in the constituent fibers of the high-density nonwoven fabric layer in an amount of 05 to 1.0%.

[0011]

The present inventors have found the following facts as a result of repeated experiments and studies. That is, in a filtration filler having a structure in which an activated carbon layer made of molded fiber activated carbon or the like and a high density nonwoven fabric layer having a density of 0.3 g / cc or more are laminated and arranged, the activated carbon layer and the high density nonwoven fabric layer are filtered per unit time. Even if the flow rate is increased, a small difference between the filtration resistance in the activated carbon layer and the filtration resistance in the high-density nonwoven fabric layer captures a large amount of suspended matter at the interface between the activated carbon layer and the high-density nonwoven fabric layer. In addition, it can exhibit the same turbidity removal performance as a hollow fiber membrane, and in the activated carbon layer and the high-density nonwoven fabric layer, if the water quality changes to the extent of tap water, the change in water quality has no effect on the progress of clogging. It is possible to always secure a stable filtration flow rate.

Therefore, according to the first aspect of the present invention, the same turbidity removal performance as that of the hollow fiber membrane can be exhibited, and yet a stable filtration flow rate can be secured for a long period of time, and moreover, filtration per unit time is achieved. Since the flow rate is large, the filtration area required to obtain the required filtration flow rate can be reduced.

In addition, in an antibacterial material in which a silver ion is bound to a synthetic inorganic insoluble material such as zeolite or an antibacterial material in which a silver compound is attached to a synthetic inorganic insoluble material, the live bacteria are killed by contact with live silver bacteria. It is known to develop antibacterial activity.

Therefore, the second invention in which such an antibacterial material is uniformly dispersed in the activated carbon layer and the high-density nonwoven fabric layer, or the antibacterial material is uniformly dispersed in the activated carbon layer, and the constituent fibers of the high-density nonwoven fabric layer are antibacterial. In the case of the third invention in which the material is mixed, the growth of viable bacteria in the activated carbon layer and the high-density nonwoven fabric layer is prevented by appropriately selecting the content ratio of silver in the activated carbon layer and the high-density nonwoven fabric layer. And keep them sterile. In this way, since it is possible to prevent the growth of live bacteria, naturally, there is no generation of live bacteria by-products such as off-flavors and off-flavors that cause water quality deterioration.

As a result of experiments and studies, the present inventors have found that the amount of antibacterial material added to the activated carbon layer and the high-density nonwoven fabric layer is such that the silver content of the activated carbon layer and the high-density nonwoven fabric layer is 0.05.
It was found that an amount of ˜1.0% is optimum from the viewpoint of antibacterial and economic aspects. That is, if it is less than 0.05%, antibacterialization of the activated carbon layer and the high-density nonwoven fabric layer cannot be reliably achieved, and if it is more than 1.0%, no improvement in antibacterial activity is observed. In addition, the elution amount of silver ions is increased.

Therefore, according to the second invention, reliable antibacterial can be economically performed.

Further, as a result of experiments and research, the present inventors have found that the amount of the antibacterial material mixed in the constituent fibers of the high-density nonwoven fabric layer is
It has been found that the amount of the constituent fiber which makes the silver content 0.05 to 1.0% is optimum from the viewpoint of antibacterial activity and economical aspect. Similar to the above, if it is less than 0.05%, the antibacterial property of the activated carbon layer and the high-density nonwoven fabric layer cannot be reliably achieved, and if it is more than 1.0%, the antibacterial activity is improved. I can't.

Therefore, according to the third invention, reliable antibacterial can be economically performed.

[0019]

As a result of the above, according to the first aspect of the present invention, the replacement can be performed by ensuring a stable filtration flow rate for a long period of time while exhibiting the same turbidity performance as the hollow fiber membrane. A long cycle reduces maintenance costs, and a large filtration flow rate per unit time reduces the filtration area required to obtain the required filtration flow rate. It has become possible to provide a packing material for filtration that can be easily incorporated into a water purifier.

Particularly, the second invention according to claim 2 and claim 3
According to the third aspect of the invention described above, in addition, it is possible to provide a filler for filtration that can economically obtain sterile purified water without causing deterioration of water quality.

[0021]

EXAMPLE As shown in FIG. 1, a filtering filler incorporated in a water purifier or the like comprises a cylindrical activated carbon layer 1 and a high-density nonwoven fabric layer 2 laminated and closely arranged on the outer periphery thereof.

The activated carbon layer 1 is made of molded fiber activated carbon and has a density of less than 0.2 g / cc. That is, if the density is 0.2 g / cc or more, similar to the hollow fiber membrane, a slight change in water quality causes rapid clogging, resulting in a reduction in filtration flow rate in a short period of time. Molded fiber activated carbon is produced by adding a binder to fiber activated carbon having a specific surface area of about 1000 to 2000 m ² / g and molding.

The high-density non-woven fabric layer 2 is a non-woven fabric produced by using synthetic fibers such as nylon fibers, polyester fibers and polypropylene fibers as a raw material (constituent fiber) and compression-processed to have a density of 0.3 g / cc or more. Made of non-woven fabric.

The activated carbon layer 1 and the high-density nonwoven fabric layer 2 are made antibacterial by adding an antibacterial material.

Examples of the antibacterial material include an antibacterial material in which a silver ion is bound to a synthetic inorganic insoluble material and an antibacterial material in which a silver compound is attached to a synthetic inorganic insoluble material. The contact between the two kills the viable bacteria. Specific examples of the antibacterial material include those in which silver ions are bound to synthetic or natural zeolite by an ion exchange reaction (hereinafter referred to as silver zeolite) and those in which silver ions are supported and bound to zirconium phosphate. You can

The means for antibacterializing the activated carbon layer 1 is a means for uniformly dispersing the antibacterial material in the activated carbon layer 1, and the addition amount of the antibacterial material necessary for the antibacterial conversion is the silver content of the activated carbon layer 1. The amount is set to 0.05 to 1.0%. Also,
As a specific means for uniformly dispersing the antibacterial material in the activated carbon layer 1, when the molded fiber activated carbon is manufactured, the antibacterial material such as silver zeolite is uniformly dispersed and mixed in the fiber activated carbon as a raw material,
Means for molding this mixture may be mentioned.

On the other hand, as means for making the high density nonwoven fabric layer 2 antibacterial, <1> means for uniformly dispersing the antibacterial material in the high density nonwoven fabric layer 2 and <2> synthetic fiber as a raw material for the high density nonwoven fabric layer Means for producing (constituent fiber) itself as an antibacterial fiber containing an antibacterial material.

The amount of the antibacterial material necessary for antibacterialization by the former <1> means that the silver content of the high density nonwoven fabric layer 2 is 0.0
The amount is 5 to 1.0%, and as a specific means for uniformly dispersing the antibacterial material in the high-density nonwoven fabric layer 2, synthetic fiber (constituent fiber) which is a raw material when manufacturing the high-density nonwoven fabric is used.
An example is a means for uniformly dispersing and mixing an antibacterial material such as silver zeolite, and producing a nonwoven fabric from the mixture.

The amount of the antibacterial material required for antibacterial conversion by the latter <2> means that the silver content of the constituent fibers is 0.05.
The amount is about 1.0%.

The high-density non-woven fabric layer 2 antibacterialized by the former <1> is referred to as an antibacterial-material-dispersed type, and the high-density non-woven fabric layer 2 antibacterialized by the latter <2> is used. It is referred to as containing type.

The filtration filler having the above-mentioned structure is
The high-density non-woven fabric layer 2 and the activated carbon layer 1 and the raw water permeate the raw water in the stated order to filter the raw water.
As shown in FIG. 2, the cartridge container 3 is used in the form of being installed therein. That is, the water purification cartridge 4 that is detachably loaded into the water purifier and the like is composed of the filtering filler and the cartridge container 3.

Explaining the cartridge container 3, the cartridge container 3 has a structure having a cylindrical portion and end plate portions for closing both ends of the cylindrical portion, and the outer peripheral surface of the high density nonwoven fabric layer 2 and the cylindrical portion. The filler for filtration is placed concentrically so as to form the raw water dispersion zone 5 between the inner peripheral surface and the inner peripheral surface of the inner portion, and each end plate portion is provided with the filler for filtration installed therein. By digging into the end surface of the activated carbon layer 1, the space between the raw material dispersion zone 5 and the hollow portion in the filler for filtration forming the filtered water collecting channel 6 passing through the gap between the end surface of the activated carbon layer 1 and the end plate portion. A ring-shaped seal portion 7 is formed to block the passage of water. A raw water inlet 8 for supplying raw water to the raw water dispersion zone 5 is formed in the cylindrical portion, and a filtered water outlet 9 for taking out filtered water from the filtered water collecting passage 6 is formed in one end plate portion. . The raw water inlet 8 and the filtered water outlet 9 are automatically connected to the raw water supply passage and the filtered water take-out passage formed in the main body as the main body such as the water purifier is loaded with the water purification cartridge 4.

The silver contents of the activated carbon layer 1 and the high density nonwoven fabric layer 2 may be the same or different. Then, in the activated carbon layer 1, the adsorption of the organic matter by the activated carbon causes the organic matter to adhere to and deposit on the surface of the activated carbon, and the activated carbon surface is likely to be the optimum environment for the growth of live bacteria. Therefore, the silver content of the activated carbon layer 1 is increased. Preferably.

Next, a water purification experiment conducted by the present inventors will be shown. <Filtration Test> Table 1 shows the specifications of the test body.

[Table 1]

The composition and the like of the activated carbon layer 1 and the high density nonwoven fabric layer 2 in the test body are as described in the examples. The high-density nonwoven fabric layer 2 is of an antibacterial material dispersed type.
Then, a test was conducted as the form of the water purification cartridge 4 described in the above-mentioned embodiment. The test was conducted at a filtration pressure of 1.
It was performed at 0 kg / m ² . Tests were carried out when the turbidity of raw water was 2 ° and 10 °. Then, the filtration flow rate of the filtration filler accompanying the filtration (liter /
Min), that is, the relationship between the total filtration flow rate (liter) and the filtration flow rate (liter / minute), and the relationship between the total filtration flow rate (liter) and the turbidity removal rate (%) were investigated. 3 and 4 show the investigation results when the raw water turbidity was 2 °, and FIGS. 5 and 6 show the investigation results when the raw water turbidity was 10 °. Particularly, when the raw water turbidity is 2 °, the improvement of the turbidity removal rate in FIG. 4 is due to the clogging of the filler due to the turbidity, which causes an increase in pressure loss. Therefore, as can be seen from FIG. 3 shown in contrast, the filtration flow rate is reduced. As a result, the practical filtration flow rate is about 50% of the initial flow rate. The same applies to FIGS. 5 and 6 (when the raw water turbidity is 10 °). The filtration performance when the high-density nonwoven fabric layer 2 is of the antibacterial material dispersed type is considered to be the same as that of the antibacterial material-containing type, that is, the difference in the filtration performance depending on the method of adding the antibacterial material. Therefore, it can be presumed that similar results can be obtained if the specifications are the same even when an antibacterial material-containing type is used as the high-density nonwoven fabric layer 2.

<Antibacterial Test> As the test body, two kinds of the high-density nonwoven fabric layer 2 of antibacterial material dispersion type and antibacterial material containing type were prepared. Table 2 shows the specifications and test results of each test body. Each specimen has a different silver content,
Other specifications are the same as those of the test body 1 shown in Table 1.

[Table 2]

The test was carried out in the form of a water purification cartridge 4. The test was conducted by sampling the filtered water at each cumulative flow rate and using the standard agar medium as the sampling water.
After culturing at 6 ° C. for 48 hours, the number of viable bacteria forming colonies in the medium was counted. ND is not detected.

[Other Embodiments] In the above-mentioned embodiment, a cylindrical packing material is shown, but as shown in FIG. 7, the filtering packing material is a columnar, cubic or rectangular parallelepiped activated carbon layer. Alternatively, the plate-shaped high-density nonwoven fabric layer 2 may be laminated on the sheet 1 in the filtration direction. In the above-mentioned examples, the activated carbon layer 1 is made of molded fiber activated carbon, but the activated carbon layer 1 may be made of fine granular activated carbon or granular activated carbon. Further, it may be molded by mixing fiber activated carbon and fine granular activated carbon, or molded by mixing fiber activated carbon and granular activated carbon.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a cutaway perspective view.

[Figure 2] Vertical sectional view of water purification cartridge

FIG. 3 is a graph showing the relationship between the total filtration flow rate and the filtration flow rate, which are the filtration test results when the raw water turbidity is 2 °.

FIG. 4 is a graph showing the relationship between the total filtration flow rate, which is the filtration test result when the raw water turbidity is 2 °, and the turbidity removal rate.

FIG. 5 is a graph showing the relationship between the total filtration flow rate and the filtration flow rate, which are the filtration test results when the raw water turbidity is 10 °.

FIG. 6 is a graph showing the relationship between the total filtration flow rate, which is the filtration test result when the turbidity of raw water is 10 °, and the turbidity removal rate.

FIG. 7 is a sectional view showing another embodiment.

[Explanation of symbols]

 1 Activated carbon layer 2 High density nonwoven fabric layer

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location C02F 1/50 540 F 560 Z B (72) Inventor Kunisaki Shinichi Shimamoto-cho, Mishima-gun, Osaka Prefecture 1023-1 Yamazaki, Sanritsu Co., Ltd. Technology Development Center, Microbial Center (72) Inventor Mitsunobu Masuda 1-32 Dojimahama, Kita-ku, Osaka City, Osaka Prefecture Takuma Co., Ltd. (72) Inventor, Jun Kawaguchi Osaka City, Osaka Prefecture 1-32 Dojimahama, Kita-ku, Takuma Co., Ltd. (72) Inventor Ken Morimoto 1-3-23, Dojimahama, Kita-ku, Osaka, Osaka

Claims (3)

[Claims] 1. A filtration filler having an activated carbon layer (1), wherein a high density nonwoven fabric layer (2) is laminated on the activated carbon layer (1) in the filtration direction. 2. An antibacterial material in which a silver ion is bound to a synthetic inorganic insoluble material or an antibacterial material in which a silver compound is attached to a synthetic inorganic insoluble material in each of the activated carbon layer (1) and the high density nonwoven fabric layer (2). Activated carbon layer (1) and high-density nonwoven fabric layer (2)
The filler for filtration according to claim 1, wherein the filler is uniformly dispersed in an amount such that the silver content is 0.05 to 1.0%. 3. An antibacterial material obtained by binding a silver ion to a synthetic inorganic insoluble material or an antibacterial material obtained by impregnating a synthetic inorganic insoluble material with a silver compound, wherein the silver content of the activated carbon layer (1) is 0.05 to 1. 0%
An antibacterial material obtained by uniformly dispersing silver ions in a synthetic inorganic insoluble material or an antibacterial material obtained by impregnating a synthetic inorganic insoluble material with a silver compound in a high density nonwoven fabric layer (2). ) The silver content of the constituent fibers is 0.05 to
The filler for filtration according to claim 1, which is contained in the constituent fibers of the high-density nonwoven fabric layer (2) in an amount of 1.0%.