JPH0663545A - Water purifier - Google Patents

Abstract

PURPOSE:To more safely use city water by eliminating effectively lead by providing furthermore a suction filtering layer for a lead component substance in raw water, in a filtering mechanism, in that which is provided with a filtering mechanism formed by combining an absorbing material and a porous hollow thread film. CONSTITUTION:This water purifier used by being connected to a faucet of city water is constituted by containing a module 2 formed by providing an activated charcoal layer 3, a suction filtering layer 7, and a hollow fiber membrane layer 4 in a laminated state in a main body vessel 1. In such a state, with respect to raw water injected from a raw water injection port 5, first of all, residual chlorine, other offensive smell component, and an organic substance in city water are eliminated in the activated charcoal layer 3, and thereafter, by the absorption filtering layer 7 consisting of an ion exchange resin, etc., a lead component substance which is dissolved in city water or exists as suspension is adsorbed and eliminated. Also, in the hollow fiber membrane layer 4, fine floating dust, a colloidal component, and moreover, bacteria, etc., which cannot be eliminated easily by only chlorine sterilization are eliminated, and thereafter, city water is discharged as purified water from a discharge port 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water purifier used mainly by connecting to a tap water tap, and more specifically, a filtration mechanism capable of adsorbing and removing lead component substances dissolved or suspended in tap water or the like. It relates to a water purifier having.

[0002]

2. Description of the Related Art A water purifier has a function of removing residual chlorine, other odorous components, organic substances, etc. in tap water by using conventional activated carbon alone. It also has a function of removing bacteria that are difficult to remove only with activated charcoal and can provide safe and delicious water, and it is being widely used mainly for the faucet direct connection type.

Further, in order to more effectively remove the germs such as bacteria which are difficult to remove only by the functions of these water purifiers and to improve the sterilization effect, a sterilizing agent such as silver is added to the filtration mechanism such as activated carbon used in the water purifiers. Various methods have been proposed and tried, such as mixing or adding, ultraviolet irradiation and ozone treatment.

[0004]

However, although these treatments are effective in removing microorganisms and chlorine-containing substances,
It is not suitable for removing heavy metal components that are dissolved in water. In particular, tap water, which is the center of drinking water, has been used as a pipe material (although it is no longer used recently) until now, and lead pipes are inevitable to elute into tap water during use. Although it meets the acceptance criteria of the Ministry of Health and Welfare, which is set based on the degree of toxicity of, the fine particles of lead ingested from tap water are easily absorbed by the intestinal tract and are accumulated in blood and bone. There are problems from the point of view of safe water.

Among such lead-containing substances, fine particles suspended in water have a micro-laminated structure which is obtained by stretching a polyolefin-based highly oriented crystalline hollow fiber and is connected to the peripheral wall portion. It has been confirmed that it can be removed to some extent by using a porous hollow fiber membrane composed of a large number of strip-shaped micropores, and if it is dissolved in water, it may be removed a little by activated carbon. It is known, but it is hard to say that it is enough in any case.

[0006] It is an object of the present invention to provide a water purifier having a function of removing lead components dissolved in tap water and the like, in addition to the function of purifying that the water purifier basically has.

[0007]

Means for Solving the Problems The subject matter of the present invention is to provide a water purifier having a filtration mechanism in which an adsorbent and a porous hollow fiber membrane are combined, which is dissolved or suspended in raw water as the filtration mechanism. The water purifier is characterized by being provided with an adsorption filtration layer for existing lead component substances.

As the hollow fiber membrane used in the filtration mechanism of the water purifier of the present invention, a precision filtration membrane or an ultrafiltration membrane having a bacterial removal performance is used, and it is a polyolefin type, a polysulfone type polyester type or a polyamide type. It is possible to use any of these. From the viewpoint that the hollow fiber membrane itself has a lead removing function, a polyolefin-based hollow fiber membrane composed of a large number of strip-shaped fine pores having a micro laminated structure connected to each other on the peripheral wall portion as described above is preferable. .

As the adsorbent used in the adsorption filtration layer of the lead component material, ion exchange resin, iron oxide hydroxide, chelate polymer-treated nonionic adsorbent, polymaleic anhydride modified polystyrene resin, poly (acrylamide oxime) )
It is possible to use an adsorbent such as a resin or an amide oxime-treated product of a PAN fiber, and this adsorbent can be used as it is or by being supported on another substance.

These adsorbents may be provided in the filtration mechanism as a single independent layer, or may be used together with the activated carbon layer in a state of being mixed with the activated carbon. It is also possible to use it as a mixture with the potting resin for the hollow fiber membrane.

[0011]

[Operation] When raw water such as tap water passes through the adsorption filter layer, it is dissolved or suspended in tap water or the like by the adsorbent of the lead component substance present in the adsorption filter layer also provided as a filtration mechanism of the water purifier. It selectively adsorbs and removes lead-containing substances.

[0012]

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical cross-sectional view showing an example of the water purifier of the present invention, where 1 is a main container, 2 is a module housed in the main container, 3 is an activated carbon layer, 4 is a hollow fiber membrane, and 5 is raw water injection. entrance,
Reference numeral 6 indicates a purified water discharge port, and reference numeral 7 indicates an adsorption filter layer of a lead component substance.

In FIG. 1, the raw water injected from the raw water inlet 5 passes through the activated carbon layer 3 to remove residual chlorine, other odorous components, organic substances, etc. in tap water, and then the activated carbon layer 3 and the hollow fiber membrane layer. 4, the lead component is selectively adsorbed and removed to reach the next hollow fiber membrane layer 4, and the hollow fiber membrane layer 4 allows fine suspended dust and colloidal components to be removed. In addition, bacteria that are difficult to remove only by chlorine sterilization are removed.

In FIG. 1, the adsorption filtration layer 7 is provided between the activated carbon layer 3 and the hollow fiber membrane layer 4, but the adsorption filtration layer 7 is located upstream of the hollow fiber membrane layer 4. It may be provided, for example, immediately before the activated carbon layer 3. Further, as described above, the adsorption filtration layer 7 is
It may be provided in the filtration mechanism as a single independent layer, or may be used in combination with the activated carbon layer in a state of being mixed with the activated carbon. Further, it may be mixed with the potting resin for the hollow fiber membrane.

As a more specific example of the present invention, a filtration mechanism (A) comprising a combination of a polyethylene porous hollow fiber membrane and activated carbon, and a filtration mechanism (B) of the present invention as shown in FIG. The raw water was filtered by a water purifier having the above-mentioned method to carry out a lead removal test in the raw water. The results were as follows.

[0016]

[Table 1]

As the water purifier, cleansui (a water purifier manufactured by Mitsubishi Rayon Co. using a polyethylene porous hollow fiber membrane)
Was used by directly connecting it to the tap water tap at home.

[0018]

The water purifier of the present invention has a lead removal function as a filtration mechanism, and enables extremely efficient removal of lead, which cannot be achieved by conventional water purifiers composed of activated carbon and hollow fiber membranes. By using the water purifier of the present invention, tap water can be made safer.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a water purifier of the present invention.

[Explanation of symbols]

 1 Main Container 2 Module 3 Activated Carbon Layer 4 Hollow Fiber Membrane 5 Raw Water Injection Port 6 Clean Water Discharge Port 7 Adsorption Filter Layer

Claims (1)

[Claims] 1. A water purifier having a filtration mechanism in which an adsorbent and a porous hollow fiber membrane are combined, and as a filtration mechanism, an adsorption filtration layer of a lead component substance existing in a state of being dissolved or suspended in raw water. A water purifier characterized by being provided with