JPS6315036B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to an improved structure of a water purifier, and more particularly to an improved structure of a purification processing section main body of a water purifier that purifies chlorine-sterilized water. (Prior Art) The filtration layer of conventional water purifiers for purifying tap water was often made of activated carbon alone. In this water purifier, residual chlorine in tap water is completely removed by the activated carbon, so when the water purifier is stopped for a long time (closed), the water inside the device, which has no sterilizing effect, remains in the activated carbon filtration layer. Bacteria grow within the filter layer, making the water discharged within the first few minutes of use of the water purifier unsuitable for drinking. To solve this problem, attempts have been made to purify tap water by using silver-loaded activated carbon in water purifiers, but the growth of bacteria in the water that comes in contact with the silver activated carbon is inhibited. However, since the water from drains does not come into contact with the silver activated carbon, it is contaminated from the air and contains bacteria, resulting in the problem that bacteria can be detected in the water immediately after the tap is opened. Increasing the silver content of silver activated carbon increases the bactericidal effect, but there is a problem in that a large amount of silver is eluted into the filtered water. In addition, groundwater and underground water from rivers are used as raw water for drinking water, but some of these raw waters contain heavy metals due to environmental pollution, and this heavy metal-contaminated raw water is treated with chlorine. Even after sterilization, there were problems that made the water undesirable for drinking. (Problems to be Solved by the Invention) The present invention is an attempt to solve the above-mentioned conventional problems, and provides water that is sufficiently purified for use as drinking water by removing chlorine and heavy metals. To provide a silver activated carbon filtration type water purifier which does not cause the growth of bacteria when the tap is closed for a long time and provides drinking water free from bacteria at the initial stage of opening after the tap is closed for a long time. (Means for Solving the Problems) Therefore, the means of the present invention for solving the above problems are as follows. That is, in the present invention, in the main body of the water purifier in which chlorine-sterilized water supplied from one side of the case passes through a filtration layer in the case and is discharged from the outlet of the other side of the case, the filtration layer contains approximately silver. It consists of a layer of activated carbon carrying 0.05 to 1.0% by weight of silver and a layer of a heavy metal adsorbent that adsorbs heavy metals, and a water-retaining member that is permeable to water and has water-retaining properties on the outer periphery or inside of both layers. is approximately equal to the length of both layers in the water flow direction, and the amount of water flowing through both layers is extremely small. The chlorine-sterilized water refers to water that has been subjected to chlorine-based sterilization treatment and made available for drinking, such as ordinary tap water, rivers, lakes, wells, underground water, and underground river water. The filtration layer consists of a main layer of silver activated carbon (hereinafter referred to as the main layer),
Heavy metal adsorbent layer (hereinafter referred to as sublayer)
Therefore, the sublayer is formed thinner than the main layer, and both layers are stacked one above the other within the case. Note that the heavy metal adsorbent is preferably one that is selective in that it selectively adsorbs unnecessary heavy metals. As the water retaining member, a material having water permeability and water retaining properties, such as a water permeable sponge material, is used. The water flow rate ratio between the filtration layer (main layer portion and sublayer portion) and the water retaining member is preferably about 4:1 to 20:1. (Function) In this invention, water is filtered (purified) by the silver activated carbon in the main layer. The activated carbon part of the silver activated carbon acts as an adsorbent for chlorine and other odor components and pollutants, and the silver part of the silver activated carbon acts as an antibacterial agent for contact water. Then, the heavy metal components of the water are removed by the heavy metal adsorbent. Although chlorine has been removed from the water in the main layer and sub-layer when the cap is closed, bacterial growth is prevented by contact with the silver portion. The water retaining member installed in the silver activated carbon filtration layer retains water containing chlorine, so bacteria that enter the drainage port side of the filtration layer are prevented by trace amounts of chlorine and trace amounts of silver dissolved in the water. Proliferation is prevented. On the other hand, when the tap is opened, most of the water passes through the silver activated carbon filtration layer and is filtered, and a small portion of the water is sent to the filtration layer outlet via the water retaining member. mixed with. In other words, the silver activated carbon suppresses bacterial growth within the filtration layer, and the sterilization effect near the filtration layer outlet is maintained by partially mixing undechlorinated water from the water-permeable water retaining member into the filtered water. This is what I am trying to do. (Example) Next, an example of the present invention will be described with reference to the drawings. The water purifier 1 shown in FIG. 1 is used by being connected via a connecting conduit H to an opening/closing point K of a chlorine-sterilized water supply source such as a tap water supply.
a cylindrical case 5 erected on the base 2 and housing a filtration layer 9 and a water retaining member 7; and a drain pipe 12 attached to the upper part of the case 5.
It consists of a lid body 11 having a. 3A is a connecting portion of a connecting conduit H formed at the outer end of the water guide hole 3, and serves as a water guide opening. An annular screwing piece 4 is formed on the upper surface of the base plate 2, and a lower end portion of the case 5 is screwed into the ring-shaped screwing piece 4. 7 is a water retaining member arranged annularly along the inner peripheral surface of the case 5,
It is made of a water-permeable and water-retaining material such as a water-permeable sponge material. Reference numeral 9 denotes a cylindrical column-shaped filter layer formed inside the annular water retaining member 7. That is, the filtration layer 9 consists of mesh water passing plates 10A to 10A.
Above the lower stage through the first layer part 8 of silver activated carbon
A, a second layer portion 8B of mineralizing agent, a third layer portion 8C of silver activated carbon, and a fourth layer portion 8D of heavy metal adsorbent. In this example, it is divided into four layer portions of equal layer thickness. The outer periphery of the four-layered portion is covered with a water retaining member 7. The water passing plates 6A and 6B at the lower and upper ends of the filtration layer 9 are large enough to cover the ends of the filtration layer 9 and the water retaining member 7, and are fitted with protrusions formed on the inner surface of the case 5. It is fastened with pieces 5A and 5B. The silver activated carbon used in the first layer portion 8A and the third layer portion 8C is obtained by the usual process of immersing activated carbon powder or granules in an aqueous silver nitrate solution, washing with water, and drying. about 0.05~1.0
% by weight (hereinafter simply abbreviated as %) is used. If the amount of silver supported is 0.05% or more, it will not exceed the tap water standard of about 100 bacteria. If the amount is 0.2% or more, no bacteria will occur, but if the amount of silver supported is too large, it is not good for drinking, so the preferred range is about 0.05 to 1.0%. As the millanizing agent for the second layer portion 8B, a crushed product containing calcium carbonate as a main component, such as limestone, marble, or coral sand, is used. Mineralizing agents have the effect of neutralizing acidic water and elute minerals into the water. The heavy metal adsorbent in the fourth layer 8D has a structure based on a copolymer of styrene and divinylbenzene and has functional groups such as imide groups, carboxyl groups, and amino groups. "Diaion CR-10" (product name), "Kurakylate G-15" (product name) manufactured by Kuraray Chemical KK, "Eporus MX-8" manufactured by Miyoshi Yushi KK.
Commercially available products such as (trade name) are used. This heavy metal adsorbent adsorbs general heavy metal ions such as Zn, Cu, and Cd contained in raw water and silver eluted from silver activated carbon. The drain pipe 12 of the lid 11 is for discharging filtered water, and has one end 12A in the center of the lid 11.
The other end 12B is rotatably attached and serves as a drain port.
is formed downward. In addition,
Base 2, case 5, and lid 11 in this example water purifier
Each connection part is connected in a watertight manner through a gasket (not shown). Now, when the water purifier 1 of this example is opened, the chlorine-sterilized water that enters the container from the water introduction hole 3 of the base 2 enters the filtration layer 9 via the water passage plate 6A and rises to the first layer. The water passes through parts 8A to 4th layer part 8D to become filtered water. That is, the water containing chlorine is affected by the silver activated carbon in the first layer section 8A and the third layer section 8C, and chlorine and the like are adsorbed by the activated carbon, and is neutralized by the action of the mineralizing agent in the second layer section 8B. Calcium content is eluted, and silver ions and heavy metal components originating from the raw water are adsorbed and removed in the fourth layer portion 8D, resulting in filtered water. On the other hand, a very small portion (a very small amount) of the water that entered the vessel through the water introduction hole 3 enters the water retaining member 7 on the outer periphery of the filtration layer 9 and rises inside the water retaining member 7, and the filtered water reaches the upper part of the filtration layer 9. The purified water (filtered water) is discharged from the mouth 12B through the drain pipe 12 (see the arrow in FIG. 4). Since the amount of water passing through the water retaining member 7 is extremely small, even if it is mixed with purified water, it has no effect on the water quality. The quantitative ratio between the filtration layer 9 and the water retaining member 7 is such that the water retaining member 7 is extremely small relative to the filtration layer 9 in a cross section perpendicular to the water flow direction, and the length of the filtration layer 9 in the water flow direction is are made approximately equal length. In this example, the water flow ratio between the filtration layer 9 and the water retaining member 7 is approximately 9:1. When the water purifier 1 is stopped (closed), the water remaining in the container contains not only the antibacterial effect of the silver component of the silver activated carbon in the filtration layer 9, but also the trace amount of chlorine in the water retained in the water retaining member 7. This action prevents bacterial growth in the water in the water purifier 1 while it is stopped, especially in the water in the water above the filtration layer 9 leading to the discharge pipe 12. Next, an experimental example using the water purifier 1 of this example will be shown. Experimental example A sponge material water retaining member made of open cells with a thickness of 10 mm is formed around the outer periphery of a filtration layer with an inner diameter of 100 mm and a length of 250 mm, and the inside is partitioned into four equal layers in the vertical direction via a water-permeable plate. The upper stage was filled with silver activated carbon, a mineralizing agent, silver activated carbon, and a heavy metal adsorbent, and tap water was passed through it at a rate of 300/h in an upward flow. Comparison Control A: The same three-layer filter layer as in the above experimental example in which the heavy metal adsorbent was not filled. For the above two points, tap water containing 0.5 ppm of residual chlorine was passed continuously at 500/h for 10 hours, then the water flow was stopped for 24 hours, and the number of bacteria in the filtered water after opening the tap was examined. The results were as shown in Table 1.

[Table] From Table 1, this example shows that the heavy metal adsorbent
It can be seen that Ag is adsorbed and removed, and the pH is increased and mineral content is added. In the above embodiment, the filtration layer 6 has a four-layer structure consisting of silver activated carbon, a mineralizing agent, silver activated carbon, and a heavy metal adsorbent, but the layer structure of the filtration layer 6 is not limited to this, and for example, silver activated carbon, silver activated carbon, It can also have a four-layer structure of a Cl-type strong basic anion exchange resin, silver activated carbon, and a heavy metal adsorbent, or a four-layer structure of silver activated carbon, a Na-type strong acid ion exchange resin, silver activated carbon, and a heavy metal adsorbent. However, it can also have a two-layer structure of silver activated carbon and heavy metal adsorbent. Although the water retaining member 7 of the above-mentioned embodiment is arranged on the outer periphery of the filtration layer 9, the water retaining member may be, for example, like the water retaining member 27 of the water purifier 21 shown in FIGS. 5 and 6.
It can be arranged so that the water flow direction in the filtration layer 29 is approximately equal to the length of the filtration layer, and the cross section perpendicular to the water flow direction is extremely small with respect to the cross section of the filtration layer.
That is, the filtration layer 29 of the water purifier 21 is connected to the water passage plate 26.
A, 30A, 30A, 30A and 26B, the first layer part 28A of silver activated carbon, the second layer part 28A of mineralizing agent.
A layer section 28B, a third layer section 28C of silver activated carbon, and a fourth layer section 28D of heavy metal adsorbent are arranged, and a water retaining member 27 is arranged vertically in each layer section and the center part of the water passage plate. There is. In this case, most of the water introduced into the vessel passes through the first layer section 28A to the fourth layer section 28D, as shown in FIG.
Although it is filtered, a very small portion of the water remains in the water retaining member 27.
The filtered water is mixed with water that has been treated with silver activated carbon, a mineralizing agent, and a heavy metal adsorbent (see the arrows in FIG. 8). When the water purifier 21 is stopped, the antibacterial effect of the silver component and the trace amount of chlorine in the water contained in the water retaining member prevent the growth of bacteria in the water remaining in the device, as in the case of the previous embodiment. . (Effects of the Invention) As explained above, in the present invention, since the filtration layer is composed of the layer of silver activated carbon and the layer of heavy metal adsorbent, most of the chlorine content in chlorine-sterilized water and the activated carbon adsorbed components are removed. , and the heavy metal components have been adsorbed and removed, making it suitable for drinking.When the water purifier is stopped, the water purifier is purified by the antibacterial action of the silver component of the silver activated carbon in the filter layer and the trace amount of chlorine contained in the water retaining material. This prevents bacterial growth in internal water. Therefore, in the water purifier of the present invention, suitable drinking water without bacterial growth can be obtained immediately after opening the tap, which is convenient.

[Brief explanation of the drawing]

The figure shows one embodiment of the present invention.
The figure is a longitudinal sectional view of the water purifier, Figure 2 is an enlarged sectional view taken along the line shown in Figure 1, and Figure 3 is a front view of the water passage plate.
Fig. 4 is an explanatory diagram of the operation of the main parts of the water purifier, Fig. 5 is a vertical sectional view of the water purifier of another embodiment, Fig. 6 is an enlarged sectional view taken along the line shown in Fig. 5, and Fig. 7 is the front view of the water passage plate. figure,
FIG. 8 is an explanatory diagram of the operation of the main parts of the water purifier. 1, 21... Water purifier, 2... Base, 3... Water guide hole, 5... Case, 7, 27... Water retaining member, 8
A, 28A...first layer part, 8C, 28C...third layer
Layer part, 8D, 28D... 4th layer part, 9, 29...
Filtration layer, 11...lid body, 12...drain pipe.

Claims (1)

[Claims] 1. In the main body of the water purifier in which chlorine-sterilized water supplied from one side of the case passes through a filtration layer in the case and is discharged from the outlet of the other side of the case, the filtration layer contains about 0.05 to 1.0% by weight of silver. It consists of a layer of supported silver activated carbon and a layer of a heavy metal adsorbent that adsorbs heavy metals, and a water-retaining member that is permeable and has water-retaining properties is located on the outer periphery or inside of both layers. A main body structure of a water purifier, characterized in that the length of the water purifier is approximately equal to the length in the water flow direction, and the amount of water flowing through both layers is arranged to be extremely small.