JPH04210292A - Bactericidal filtering device and production of bactericidal filter bed used therefor - Google Patents

Abstract

PURPOSE:To be porous the Ag carried on a resin filter, to be easily chlorinated and to make it favorable as a bactericidal filter bed by carrying silver chloride on the filter bed consisting of a porous ceramic plate or the resin filter, etc., or a filter material consisting of ceramic particles, etc. CONSTITUTION:Warm water being flowed in from a raw water inflow pipe 7 is eliminated large dusts, etc., with a flow straighting plate 17 consisting of the porous ceramic plate to simultaneously distribute the raw water on the filter material 16 consisting of ceramic particles or glass carried with silver chloride distributed on the bed 17 without carrying silver chloride, to almost uniformly supply the water to eliminate small dusts and scales, etc., and simultaneously to sterilize the water. The purified warm water is cycled from a purification discharge pipe 8 to a water bath 1. When the filter bed 17 is made from the resin filter or the porous ceramic plate carried with silver chloride, even though the particles such as ceramic particles of glass beads, not carrying silver chloride are used for the filter material 16, the water is sterilized and purified as well. The silver carried on the resin filter is porous and it is easily chlorinated and it becomes suitable as a bactericidal filter bed.

Description

[Detailed description of the invention]

[00011

[Field of Industrial Application] The present invention relates to a sterilizing filtration device for purifying hot water used in circulating water heaters for baths and the like, and a method for manufacturing a sterilizing filter bed used therein. [0002] In recent years, interest in bath life has increased, and hot water circulation devices for baths have been developed as bathtub systems that allow bathing at all times. Due to its nature, hot water circulation devices for baths require a sterilizing filtration device for hot water purification, and various proposals have been made. [0003] A conventional sterilizing filtration device will be explained below. FIG. 3 is a schematic configuration diagram of a general bath hot water circulation device, and FIG. 4 is a sectional view of a main part of a conventional sterilizing filtration device. 1 is a bathtub, 2 is a suction port equipped with a filter for filtering out large debris such as hair, 3 is a discharge port for purified hot water, 4 is a suction pipe, 5 is a pump for circulating hot water, and 6 is a pump 5
7 is a raw water inflow pipe connecting the discharge side of the pump 5 and the raw water inlet side of the sterilizing filtration device 6; 8; is the purified water discharge pipe. In FIG. 4, 9 is a sterilizing filter tank, 10 is a sterilizing means such as an ozone generator or an ultraviolet germicidal lamp, 11 is a filter material made of zeolite, activated carbon, etc., and 12 is a sterilizing filter tank.
1 is a filter bed made of a porous ceramic plate or a resin filter that holds the filter medium 11, and 13 is a flow dividing plate that controls the flow of water. [0004] The sterilizing filtration method of the conventional sterilizing filtration device configured as described above will be explained below. Hot water flowing in from the raw water inflow pipe 7 is rectified to some extent by a flow divider plate 13 and is supplied onto a filter medium 11 such as zeolite, which adsorbs bacteria and filters fine dust and scale. The water is then sterilized by ozone and ultraviolet sterilization means 10, and purified and sterilized hot water is supplied from the purified water discharge pipe 8 to the bathtub 1 to maintain sanitary conditions. [00051] Next, a conventional method for supporting silver will be explained. FIG. 5 is a sectional view of a main part of a conventional arc thermal spraying apparatus. 20 and 21 are silver wires, each of which is energized. 22 is an air blowing nozzle, and 23 is an arc spraying device. [0006] A method of supporting silver using the conventional arc spraying apparatus configured as described above will be described. silver wire 2
0.21 contacts at the tip of the arc spraying device 23, and since a voltage is applied to each, the contact points become high temperature and molten silver 24 is formed. This molten silver 24 was blown onto the target object 25 with an air flow from the nozzle 22 to be carried thereon. [0007]

[Problems to be Solved by the Invention] However, in the above conventional configuration, when the circulation of hot water is stopped, bacteria are naturally not adsorbed to the zeolite or activated carbon at all.
Furthermore, even if ultraviolet rays and ozone sterilize the inside of the filter tank, they cannot sterilize the hot water in the bathtub, and as a result, bacteria breed in the bathtub, causing scale to build up, slime, etc., and a bad odor. It had some problems. [0008] Also, when the hot water in the bathtub is drained, the hot water remains in the bathtub to the extent that the filter material is immersed in the filter tank in order to protect the hot water circulation system and to prevent the filter tank from being destroyed by freezing. However, when doing so, there was a problem in that bacteria grew in the remaining water, causing scale and bad odors. Furthermore, sterilization using ozone, chlorine, etc. has a problem in that there is concern that residual substances in hot water may have an adverse effect on the human body and system equipment. [0009] Furthermore, in the method for manufacturing a sterilizing filter bed using the conventional silver supporting method, the molten silver is cooled by the conveying air flow, so it is necessary to raise the temperature of the molten part to a high temperature. When silver is supported on a flammable resin filter that is not heat resistant, it is necessary to maintain a predetermined distance between the spray gun and the object in order to cool the molten silver appropriately. Ta. As a result, it is impossible to obtain a uniform silver support film, and the silver temperature becomes too high or the silver is cooled too much, resulting in uneven adhesion and peeling of the supported silver. However, it has been particularly difficult to summarize the results for resin filters that have poor heat resistance. Therefore, it has been impossible to industrially produce a sterilizing filter bed by chlorinating a resin filter carrying silver. [00101 The present invention solves the above-mentioned conventional problems, and aims to provide a sterilizing filtration device that promises a hygienic and comfortable pass life with a sustained sterilizing effect, and a method for manufacturing a sterilizing filter bed used therein. purpose. [0011]

[Means for Solving the Problems] In order to achieve this object, the sterilizing filtration device of the present invention and the method for manufacturing the sterilizing filter bed used therein provide a method for manufacturing a sterilizing filter bed using silver chloride dissolved in hot water and continuously exhibiting a sterilizing effect. The filter is supported on a filter bed made of a ceramic plate, a resin filter, etc., or a filter medium made of ceramic particles, etc., and is used in a sterilizing filtration device. Further, it has a structure in which silver is supported on a resin filter lacking in heat resistance by using a low-temperature spraying method, and then the supported silver is chlorinated to produce a sterilizing filter bed. [0012]

[Operation] With this configuration, silver chloride is supported on the filter bed and filter medium, so regardless of whether the circulating water heater is operating or not,
Silver chloride is eluted into the hot water, and the silver ions kill germs, keeping the bathtub clean at all times. In addition, by using a low-temperature spraying method on resin filters, which were unable to support silver due to their lack of heat resistance, it became possible to uniformly support the required amount of silver over the entire surface of the resin filter. Ta. Since the silver supported on the resin filter is porous, it can be easily chlorinated, making it possible to obtain a resin filter suitable as a sterilizing filter bed. [0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. [00141 FIG. 1 is a sectional view of the main parts of the sterilizing filtration device. 7 is a raw water inflow pipe, 8 is a purified water outflow pipe, 9 is a sterilization filter tank,
Reference numeral 13 denotes a flow divider plate, which is the same as in the conventional example, so the same number will be given and the explanation will be omitted. Reference numeral 14 denotes a rectifier plate made of a porous ceramic plate that rectifies and distributes hot water from the raw water inflow pipe 7 and filters large and small dust and scale. Note that the current plate 14 may be supported with silver if necessary. 15 is a fixing device for the rectifying plate 14; 16 is a filter medium made of fine particles such as ceramic particles or glass beads on which silver chloride is supported or not; 17
A filter bed for holding the filter medium 16 is made of a porous ceramic plate carrying silver chloride, a resin filter, or the like. The larger the amount of silver chloride supported on the porous ceramic plate or resin filter, the better the sterilizing effect will last and the durability will increase, but on the other hand, if it is too large, the porosity will decrease, pressure loss will increase, and the filter tank etc. There is a risk of damage due to excessive pressure being applied to the filter, so the selection is made appropriately depending on the size of the sterilizing filtration device, but generally 0. Approximately 1 g/cm2 to 10 g/cm2 is desirable. Silver can also be supported on ceramic granules by a chemical method in which the ceramic granules are immersed in a silver ion-containing solution and then reacted with chlorine ions, or by spreading the ceramic granules or glass beads with oil (e.g. The silver chloride film may be fused to the surface by coating after coating with a paste made by mixing a predetermined amount of squeegee oil (manufactured by Suefushi Shiki Kagaku Kogyo Co., Ltd.) and silver chloride powder (hereinafter referred to as the baking method). [0015] Next, a method for manufacturing a sterilizing filter bed made of a resin filter will be described. FIG. 2 is a sectional view of a main part of a low temperature thermal spraying apparatus in an embodiment of the manufacturing method of the present invention. 2
0.21 is a voltage applied silver wire, 24 is molten silver,
Reference numeral 25 is a target object made of a resin filter, 26 is a low-temperature spraying device, and 27 is a nozzle fitted to the tip of the low-temperature spraying device 26 for ejecting air. When the silver wires 20, 21 make contact, the contact becomes hot and molten silver 24 is formed due to the voltage applied thereto. When air is ejected from the nozzle 27, a conical reduced pressure layer (generally 0.7 kg/cm2) is formed in front of the molten silver 24, and the molten silver 24 is absorbed by the reduced pressure layer and has a thickness of 5 to 150 μm. At this moment, the silver particle temperature is about 1/10 of the average melting temperature.
It is cooled to a certain extent, and further cooled while traveling the distance to the object 25, and is blown onto the object 25 and carried there. [0016] Next, the resin filter carrying silver is chlorinated in a chlorination step. As the chlorination step, for example,
A resin filter carrying silver is stirred and immersed in a 6% sodium hypochlorite solution for about 1 hour to chlorinate the sprayed silver, and then dried thoroughly, or the sprayed silver is exposed to a chlorine gas atmosphere. This is done by, for example, [0017] Silver chloride may be supported on the porous ceramic plate by the above-mentioned method of supporting on ceramic granules, that is, the firing method, but it is also possible to support silver chloride directly on the porous ceramic plate by an arc spraying method or a low-temperature spraying method. May be chlorinated. [0018] The method of using the sterilizing filtration device of this embodiment configured as described above will be explained below. The hot water that flows in from the raw water inlet pipe 7 is filtered to remove large particles and the like by a rectifying plate 14 made of a porous ceramic plate, and is also filtered with ceramic grains carrying silver chloride and spread over a filter bed 17 that does not carry silver chloride. The raw water is distributed over a filter medium 16 made of glass beads, etc., and the water is supplied approximately evenly, filtering out small dirt, scales, etc., and sterilizing the water.
circulates purified hot water to When the filter bed 17 is a resin filter or porous ceramic plate supported with silver chloride, the filter medium 16 can be sterilized and purified in the same way even if granules such as ceramic grains or glass beads that do not support silver chloride are used. Ru. [00191] Next, the sterilizing filtration device of the present invention and a conventional example will be explained based on Examples and Comparative Examples. [00201 (Example 1) Squeegee oil (manufactured by Suefushi Shiki Kagaku Kogyo Co., Ltd.) and silver chloride powder (Yamanaka Kikinzoku (Yamanaka Kikinzoku) Co., Ltd.) were mixed, and the prepared paste was coated on a porous ceramic plate, left at room temperature for 10 minutes, and then fired at 600° C. for 30 minutes. As a result, the squeegee oil was completely decomposed, and a sterilized filter bed in which silver chloride was fused approximately evenly on the porous ceramic plate was obtained. This sterilizing filter bed was attached to the sterilizing filtration device shown in FIG. 1, and then glass beads 1. 5 kg was evenly spread and laid on the sterilized filter bed. A rectifier plate made of a porous ceramic disk with a diameter of 100 nm was placed above the filter tank. The second sterilizing filtration device was installed in a bath circulation hot water system and an experiment was conducted. The experimental conditions were
2001 water was injected into the bathtub, heated and kept at 40°C, then common bacteria were injected, and the hot water was continuously circulated for 240 hours. During that time, water samples are taken at regular intervals.
The number of bacteria in the filter (general bacteria test: ordinary agar medium, manufactured by Eiken Kagaku Co., Ltd.) and the amount of silver ions eluted (atomic absorption spectrophotometer: Japan Jarre II Ash AA-86)
0) was measured and the change over time was determined. The results (Table 1)
Shown below. [00211 (Example 2) 17 g of silver was uniformly sprayed on the surface of a resin filter stretched over a mold using a low-temperature spraying method, and after cooling to room temperature, it was stirred in a 6% sodium hypochlorite solution for 60 minutes. After immersion and chlorination of the sprayed silver, it was dried at a temperature of 60° C. for 180 minutes. The amount of silver chloride supported was 20 g. An experiment was conducted under the same conditions as in Example 1, except that this silver chloride-supported resin filter was used as a sterilizing filter bed in place of the silver chloride-supported porous ceramic plate of Example 1. The results are shown in Table 1. [0022] (Comparative Example 1) Same as Example 1 except that the porous ceramic disc used in Example 1 was used as a filter bed without being treated to support silver chloride, and an ultraviolet germicidal lamp was installed in the filter tank. The experiment was conducted under the following conditions. The results are shown in (Table 1). [0023] (Comparative Example 2) An experiment was conducted under the same conditions as in Example 1, except that the porous ceramic disc used in Example 1 was used as a filter bed without being subjected to silver chloride support treatment. The results are shown in (Table 1). [0024]

[Table 1] [0025] As is clear from this (Table 1), in Examples 1 and 2, no bacteria were detected 2 hours after hot water circulation. In addition, in Comparative Example 1, no bacteria were detected within 1 hour. In Comparative Example 2, it increased rapidly after 4 hours. [o o 26] (Example 3) Using the experimental equipment of Example 1 and under the same conditions, a circulating water heater was operated for 24 hours, and then stopped for 72 hours and left to stand for a specified period of time. First, the number of bacteria and the amount of silver ions eluted were measured in the same manner as in Example 17, and their changes over time were determined. The results are shown in (Table 2). [0027] (Example 4) An experiment similar to Example 3 was conducted using the experimental equipment of Example 2 and under the same conditions. The results are shown in (Table 2). [0028] (Comparative Example 3) Using the experimental equipment of Comparative Example 1 and under the same conditions, an experiment similar to that of Example 3 was conducted. The results are shown in (Table 2). [0029] (Comparative Example 4) An experiment similar to Example 3 was conducted using the experimental equipment of Comparative Example 2 and under the same conditions. The results are shown in (Table 2). [00301 (Example 5) Ceramic grains with an average grain size of 2 mm 1. An experiment was conducted under the same conditions as in Comparative Example 4, using 5 kg of filter material prepared in the same manner as in Example 1 and supporting 20 g of silver chloride as a filter medium. As a result, results similar to those of Example 3 were obtained. [00311

[Table 2] (0032) As is clear from (Table 2), in Examples 3 and 4, no bacteria were observed even if the circulation of hot water was stopped and the water was left standing. This is because the bactericidal effect of UV irradiation continues.In Comparative Example 3, bacterial growth was observed 4 hours after the circulating water heater was stopped, and the number increased exponentially thereafter. This is because the sterilization effect of ultraviolet rays stopped when the circulating water heater stopped operating, and the sterilizing effect of ultraviolet rays disappeared.Therefore, with sterilizing with ultraviolet rays, it is necessary to constantly circulate hot water and expose it to ultraviolet rays even when the bathtub is not in use, which significantly It can be seen that energy is consumed. [0033] Also, when the hot water in the bathtub is drained, the circulating water heater usually drains the hot water in the filter tank to the filter bed to protect the system and prevent the filter tank from being destroyed by freezing. However, the silver ions eluted from Examples 3, 4, and 5 can prevent bacterial growth, prevent slime, and prevent bad odors. It can be seen that there is no problem even if the bathtub is filled with water and bathed again. Using a ceramic plate is effective because it dramatically increases the amount of silver ions eluted while using a circulating water heater.Also, when the amount of supported silver chloride is small, use a filter bed and filter medium that support silver chloride. [0035] [Effects of the Invention] As described above, the present invention allows silver chloride to be supported on the filter bed or filter medium, thereby preventing large and small dust and scale from being removed while the bathtub is in use. It not only filters the bacteria, but also efficiently supplies silver ions with high sterilization effect into the bathtub without consuming energy, preventing the growth of bacteria. It is extremely safe and does not cause slipping and accidents. [0036] It also maintains its sterilizing properties even when draining hot water from the bathtub or when the bathtub is not used for a long time with hot water in it, and does not cause slime inside the bathtub. This makes it possible to realize an excellent sterilizing filtration device that can provide a comfortable pass life without producing bad odors in the bathroom or bathroom. It is now possible to provide a sterilizing filter bed made of manufactured filters with good workability and high production efficiency.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of essential parts of a sterilizing filtration device for hot water purification in one embodiment of the present invention.

[Fig. 2] A cross-sectional view of the main parts of the low-temperature spraying apparatus in the manufacturing method of the present invention

[Figure 3] Schematic diagram of a general bath hot water circulation device

[Figure 4] Cross-sectional view of main parts of a conventional sterilizing filtration device

[Figure 5] Cross-sectional view of main parts of conventional arc thermal spraying equipment

[Explanation of symbols]

1 Bathtub 2 Suction port 3 Discharge port 4 Suction pipe 5 Pump 6 Sterilization filtration device 7 Raw water inflow pipe 8 Purified water discharge pipe 9 Sterilization filtration tank 10 Sterilization means 11 Filter medium 12 Filter bed 13 Flow divider plate 14 Current plate 15 Fixtures 16 Filter media 17 Filter bed 20.21 Silver wire 22 Nozzle 23 Arc spraying equipment 24 Molten silver 25 Subject 26 Low temperature thermal spraying equipment 27 Nozzle

Claims (4)

[Claims] 1. A sterilizing filtration device characterized by having a filter bed supporting silver chloride. 2. A sterilizing filtration device comprising a filter bed carrying silver chloride and a filter medium carrying silver chloride. 3. The sterilizing filtration device according to claim 1, wherein the filter bed is a resin filter or a porous ceramic plate. 4. A method for producing a sterilizing filter bed made of a resin filter supporting silver chloride, comprising a supporting step of supporting silver on the surface of the resin filter by a low-temperature melting method; A method for producing a sterilizing filter bed, comprising: a chlorination step of chlorinating silver.