JP2005081325A - Method and apparatus for sterilizing drinking water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for conveniently performing sterilization of drinking water. <P>SOLUTION: The method and the apparatus for sterilizing drinking water comprises a fixed bed or a fluidized bed having a filter material made by mixing porous ceramic and particulate activated carbon and a drinking water passing means which allows drinking water to pass at a prescribed flow rate. Particle size of the porous ceramic fixed by the fixing bed is distributed in the range of 1 to 15 mm and particle size of the particulate activated carbon is distributed in the range of 0.1 to 2 mm. Either of particle size of the porous ceramic or the particulate activated carbon fixed by the fluidized bed is distributed in the range of 0.1 to 3 mm. The flow rate on a drinking water fixed filter material passing means falls in the range of 0.5 to 6 mm/sec. The flow rate on a drinking water fluidized filter material passing means falls in the range of 3 to 10 mm/sec. As to the drinking water passing means, a pump, a head or a tap water pressure is used. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

The present invention relates to a method and apparatus for sterilizing water into potable water.

Patent Document 1 discloses a waste water purification treatment method and apparatus based on the inventor's knowledge that a sterilization effect is produced by the mixed flow of porous ceramics and granular activated carbon. Patent Documents 2, 3, and 4 disclose a method of performing a wastewater treatment by mixing porous ceramics and granular activated carbon and using them as a fixed bed.

JP 2003-71480 A JP-A-60-261586 JP-A-2-28399 JP-A-10-118643

Patent Documents 1, 2, 3, and 4 are all techniques for purifying from the need to make them harmless when discarding sewage. The inventor of the present application thought that potable water could be produced by a similar method. And when the experiment using the mixed filter medium of porous ceramics and granular activated carbon was repeated under various conditions, finally, a sterilization method and apparatus for drinking water could be obtained. An object of the present invention is to provide a method and apparatus for simply sterilizing potable water.

  The method for sterilizing potable water according to the present invention includes a mixed filter medium fixing step for fixing a filter medium mixed with porous ceramics and granular activated carbon so that the filter medium does not move, and potable water on the filter medium fixed in the mixed filter medium fixing step. A drinking water-fixed filter medium passing step.

  The invention described in claim 2 includes a mixed filter medium flow holding step in which a filter medium obtained by mixing porous ceramics and granular activated carbon is held in a state where it can move according to the flow of water, and the mixed filter medium flow holding step. A drinking water sterilization method comprising a drinking water flow filter medium passing step for allowing drinking water to pass through a retained filter medium.

  According to a third aspect of the present invention, there is provided a drinking water-fixed filter medium passing step for allowing drinking water to pass through a filter medium fixed so as not to move a filter medium in which porous ceramics and granular activated carbon are mixed. This is a drinking water sterilization method comprising a drinking water flow filter medium passing step for allowing drinking water to pass through a filter medium held in a state where the filter medium mixed with can be moved according to the flow of water.

  The invention described in claim 4 is a drinking water flow filter medium passing step for allowing drinking water to pass through the filter medium held in a state in which the filter medium in which porous ceramics and granular activated carbon are mixed can move according to the flow of water, This is a drinking water sterilization method comprising a drinking water-fixed filter medium passing step for allowing drinking water to pass through a filter medium fixed so that the filter medium in which porous ceramics and granular activated carbon are not moved.

  Invention of Claim 5 is the sterilization processing method of the drinking water in any one of Claim 1, 3 or 4, Comprising: The particle size of the said fixed porous ceramics is 1 millimeter to 15 millimeters It is a method for sterilizing potable water that is distributed between and the particle size of granular activated carbon is distributed between 0.1 millimeters and 3 millimeters.

  Invention of Claim 6 is the sterilization processing method of the drinking water in any one of Claim 2, 3 or 4, Comprising: As for the particle size of the porous ceramics and granular activated carbon which are hold | maintained fluidly, both It is a method for sterilizing potable water distributed between 0.1 millimeters and 3 millimeters.

  The invention described in claim 7 is the method for sterilizing drinking water according to any one of claims 1, 3 and 4, wherein the flow rate in the drinking water fixed filter medium passing step is 0.5 to 6 millimeters per second. This is a method for sterilizing potable water that is any of the above.

  The invention described in claim 8 is the method for sterilizing potable water according to any one of claims 1, 3 or 4, wherein the flow rate in the potable water fixed filter medium passing step is from 1 millimeter to 4 millimeters per second. A method for sterilizing potable water.

  Invention of Claim 9 is the sterilization processing method of the drinking water in any one of Claim 1, 3 or 4, Comprising: The flow rate in a drinking water fixed filter medium passage step is 2 millimeters per second from 3 millimeters. A method for sterilizing potable water.

  The invention described in claim 10 is a method for sterilizing potable water according to any one of claims 2, 3 or 4, wherein the flow rate in the potable water flow filter medium passing step is from 3 millimeters to 10 meters per second. A method for sterilizing potable water.

  A potable water sterilization apparatus according to the present invention includes a mixed filter medium fixed bed in which a filter medium in which porous ceramics and granular activated carbon are mixed is fixed so as not to move, and a potable water at a predetermined flow rate on the mixed filter medium fixed bed. And a drinking water-fixed filter medium passing means for passing the water.

  The invention described in claim 12 is a mixed filter medium fluidized bed in which a filter medium obtained by mixing porous ceramics and granular activated carbon is held in a state where it can move according to the flow of water, and a predetermined amount is provided in the mixed filter medium fluidized bed. Is a sterilization apparatus for drinking water comprising drinking water flow filter medium passing means for allowing drinking water to pass therethrough.

  The invention described in claim 13 is a mixed filter medium fixed bed for fixing a filter medium mixed with porous ceramics and granular activated carbon so that it does not move, and drinking that allows drinking water to pass through the mixed filter medium fixed bed at a predetermined flow rate. Water fixed filter medium passing means, a mixed filter medium fluidized bed in which a filter medium in which porous ceramics and granular activated carbon are mixed can move according to the flow of water, and drinking water at a predetermined flow rate in the mixed filter medium fluidized bed A potable water fluid filter medium passing means for allowing the potable water passing through the mixed filter medium fluidized bed to pass through the mixed filter medium fluidized bed.

  The invention described in claim 14 is a mixed filter medium fixed bed for fixing a filter medium mixed with porous ceramics and granular activated carbon so that the filter medium does not move, and drinking that allows drinking water to pass through the mixed filter medium fixed bed at a predetermined flow rate. Water fixed filter medium passing means, a mixed filter medium fluidized bed in which a filter medium in which porous ceramics and granular activated carbon are mixed can move according to the flow of water, and drinking water at a predetermined flow rate in the mixed filter medium fluidized bed A potable water fluid filter medium passing means for allowing the potable water passing through the mixed filter medium fluidized bed to pass through the mixed filter medium fixed bed to sterilize the potable water.

  The invention described in claim 15 is the drinking water sterilization apparatus according to any one of claims 11, 13 or 14, wherein the porous ceramics fixed on the mixed filter medium fixed bed have a particle size. A device for sterilizing potable water distributed between 1 and 15 millimeters and having a granular activated carbon particle size between 0.1 and 3 millimeters.

  The invention described in claim 16 is the sterilization apparatus for potable water according to any one of claims 12, 13 or 14, wherein the porous ceramics and granular activated carbon retained in the mixed filter medium fluidized bed are provided. It is a potable water sterilization apparatus in which the particle size is distributed between 0.1 millimeters and 3 millimeters.

  The invention described in claim 17 is the potable water sterilization apparatus according to any one of claims 11, 13 or 14, wherein the flow rate in the potable water fixed filter medium passing means is 0.5 mm to 6 mm per second. This is a sterilization apparatus for drinking water that is either

  The invention described in claim 18 is the sterilization apparatus for drinking water according to any one of claims 11, 13 or 14, wherein the flow rate in the drinking water fixed filter medium passing means is from 1 millimeter to 4 millimeters per second. This is a sterilization apparatus for potable water.

  The invention described in claim 19 is the apparatus for sterilizing drinking water according to any one of claims 11, 13 or 14, wherein the flow rate in the drinking water fixed filter medium passing means is from 2 millimeters to 3 millimeters per second. This is a sterilization apparatus for potable water.

  The invention described in claim 20 is the sterilizing apparatus for drinking water according to any one of claims 12, 13 or 14, wherein the flow rate in the drinking water flow filter medium passing means is from 3 millimeters to 10 meters per second. This is a sterilization apparatus for potable water.

  The invention described in claim 21 is the sterilization apparatus for potable water according to any one of claims 11, 13, or 14, wherein the potable water-fixing filter medium passing means is a pump. .

  The invention described in claim 22 is the drinking water sterilization apparatus according to any one of claims 12, 13 or 14, wherein the drinking water flow filter medium passing means is a pump. It is.

  The invention described in claim 23 is the apparatus for sterilizing potable water according to any one of claims 11, 13, or 14, wherein the potable water-fixing filter medium passing means uses a drop. This is a water sterilization apparatus.

  The invention described in claim 24 is the potable water sterilization apparatus according to any one of claims 12, 13 or 14, wherein the potable water flow filter medium passage means uses a drop. This is a sterilization apparatus.

  The invention described in claim 25 is the potable water sterilization apparatus according to any one of claims 11, 13, or 14, wherein the potable water fixing filter medium passing means utilizes water pressure. It is a device for sterilizing potable water.

  The invention described in claim 26 is the potable water sterilization apparatus according to any one of claims 12, 13 or 14, wherein the potable water flow filter medium passing means uses tap water pressure. This is a water sterilization apparatus.

  According to the present invention, an effect of sterilizing general bacteria, E. coli, and the like contained in water such as well water and spring water can be obtained. The sterilization effect can be obtained only by passing water (only with a pump or the like at a constant flow rate) without requiring a special device.

  Hereinafter, a method and apparatus for sterilizing potable water according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of a potable water sterilization apparatus using a fixed bed. The treatment tower 1 includes a central portion including a filter medium (fixed bed) 8, a portion for introducing treated water (potable water before treatment) 9, and a portion for taking out treated water (potable water after treatment) 10. It consists of two parts, which are connected by a flange 2. Strainers 3 are provided above and below the filter medium 8 to remove dust contained in water before treatment. The treated water 9 is introduced into the treatment tower 1 through the treated water pipe 6, passed through the filter medium 8 through the strainer 3, and taken out as treated water 10 through the upper treated water pipe 7. A drain valve 4 is provided at the bottom of the processing tower 1 and is used when it is necessary to take out accumulated sludge and the like. In addition, an air vent valve 5 is provided at the top of the processing tower 1 and is used when it is necessary to remove air. Although the flow rate of water passing through the filter medium 8 will be described later, the flow rate of water passing through the filter medium 8 is adjusted by the water pressure when the water 9 to be treated is fed. The water pressure depends on the capacity of the pump when pumping water. Moreover, when using a head without using a pump, it depends on the magnitude of the head. In order to obtain the appropriate flow rate described below, the capacity of the pump or the size of the head is determined.

  FIG. 2 is a schematic view of a potable water sterilization apparatus using a fluidized bed. A different part from the case where the fixed floor of FIG. 1 is used is demonstrated. There are two major differences. One is that the filter medium 20 is a fluidized bed, and the filter medium upper end 22 when flowing is higher than the filter medium upper end position 21 when stationary. Secondly, a circulation pipe 17, a circulation pump 18, and a relay tank 19 are provided. After the treated water 23 has repeatedly passed through the inside of the treatment tower 11, it is taken out as treated water 24. That is. The apparatus using the fixed bed depicted in FIG. 1 and the apparatus using the fluidized bed depicted in FIG. 2 can be used in combination. Either can be passed first. The fixed bed and fluidized bed are not limited to one, and two or more may be arranged in series or in parallel. A plurality of processing towers having different sizes may be used.

The filter medium used for the fixed bed and the filter medium used for the fluidized bed are both mixed with porous ceramic granules and granular activated carbon. The porous ceramic used here is a porous ceramic having SiO ₂ and Al ₂ O ₃ as main components. An example of the manufacturing method is as follows, but is not limited to this method. A mixture of two or more selected from clay, quartzite, and aluminum hydroxide is added to and mixed with sawdust, rice crackers, etc., as a foam-forming material, and the mixture is blocked or in any other suitable shape. After drying, the bubble forming material disappears by firing, and a porous portion is created. For example, when the above three components are used, the clay is 20 to 70 weight percent, the silica is 70 to 20 weight percent, the aluminum hydroxide is 10 weight percent, and 100 to 140 parts by weight of sawdust and 100 to 140 parts by weight of water. In addition, the mixture is formed into an appropriate shape such as a block state, dried to a certain state by natural drying or forced drying, and then baked at 1000 degrees Celsius or higher to obtain SiO ₂ and Al ₂ O ₃ Make porous ceramics with the main component. The firing temperature is preferably 1050 to 1350 degrees Celsius, and more preferably 1200 to 1300 degrees Celsius. Here, it is preferable to contain 80 to 45 percent by weight of SiO ₂ and 15 to 40 percent by weight of Al ₂ O ₃ , and the respective lower limit values, that is, SiO ₂ is 45 percent by weight or less and Al ₂ O ₃ is 15 percent by weight or less. A porous ceramic preferable for this invention cannot be produced. Further, it has been found that SiO ₂ is not less than 80 weight percent and Al ₂ O ₃ is not less than 40 weight percent for the same reason.

  The granular activated carbon is preferably made of coal or palm material, and charcoal, bamboo charcoal, bone charcoal, and activated carbon particles containing them as components can also be used.

  Preferred conditions for the size of the grains are shown. First, regarding the fixed bed, both porous ceramics and granular activated carbon preferably have a particle size of 0.1 to 15 millimeters. A mixture of granules having uniform sizes may be used, but a mixture of granules having irregular sizes is preferable. This is based on the reason that water can be passed at a low pressure and blockage by suspended substances is unlikely to occur. Accordingly, preferred particle sizes are those in which the particle size is distributed between 0.1 and 15 millimeters. Practically, it is desirable that the porous ceramic has a particle size of 1 to 15 millimeters and the granular activated carbon has a particle size of 0.1 to 3 millimeters. This is because the adsorption performance of granular activated carbon can be used effectively, and it is excellent in the removal performance of pollutants in water. Other combinations may be used to obtain the effect of sterilization.

  Regarding the flow rate of water passing through the filter medium (fixed bed), it is desirable to maintain a constant linear velocity. It is good to keep 0.5 to 6 millimeters per second. More preferably, it is 1 to 4 millimeters per second, and more preferably within a range of 2 to 3 millimeters per second.

  The mixing ratio of the porous ceramic and the granular activated carbon in the filter medium (fixed bed) is preferably about 5 to 90 volume percent as the porous ceramic, about 95 to 10 volume percent as the granular activated carbon, and more preferably about 20 as the porous ceramic. Use about 70 to 70 volume percent, and about 80 to 30 volume percent as the granular activated carbon.

  In a fluidized bed, the linear velocity range is preferably 3 to 10 millimeters per second. The particle size is preferably 0.1 to 3 millimeters for both porous ceramics and granular activated carbon. The mixing ratio may be the same as that of the fixed bed.

  Compare the fixed bed with the fluidized bed. The fixed bed is characterized in that it can be used in a wide flow rate range and is easily clogged when the suspended substance contained in the water to be treated is large. On the other hand, the fluidized bed has characteristics such that it is difficult to trap suspended solids if it is flowing, it is difficult to block it if it is flowing, and it is difficult to block because it does not flow at a low flow rate.

  The porous ceramic itself does not have a sterilizing action. Also, the granular activated carbon does not have a sterilizing action. Although sterilization is considered to be caused by some physicochemical action that occurs when water passes through the contact point between the fixed porous ceramic and the granular activated carbon, the detailed mechanism is unknown.

Sterilization was conducted when water was passed through a fixed bed of a mixture of porous ceramics (firing temperature 1300 degrees Celsius) and granular activated carbon. Porous ceramics were prepared by adding the foam-forming material sawdust and water to a mixture of clay, silica and aluminum hydroxide, mixing the mixture, drying the mixture in a block state, and firing at 1300 degrees Celsius. . The contents (weight percent) of SiO ₂ and Al ₂ O ₃ in the porous ceramics were 69 percent and 21 percent, respectively. The other ingredients and content (weight percent) were 0.80 percent Fe ₂ O, 0.93 percent K ₂ O, 0.45 percent CaO, 2.50 percent MgO, 0.35 Na ₂ O. The percent TiO ₂ was 0.30 percent. The porosity was 82% and the bulk specific gravity was 0.35. This porous ceramic was pulverized and classified into 2 to 10 millimeters. Activated carbon having a particle size of about 1 to 3 millimeters was used.

A fixed bed was prepared by filling 50 g of a mixture of porous ceramics sterilized by dry heat and activated carbon, respectively, into a cylindrical container (can be circulated with external water) having a diameter of 40 mm. After autoclaving 1 liter of a solution prepared by dissolving 150 mg / L of sodium acetate as TOC (total organic carbon: total organic carbon) in pH 7 phosphate buffer (including ammonium salt) prepared with tap water, In a container. The inoculum suspension was added so that the inoculum (Pseudomonas aeruginosa) was 10 ³ / ml. The number of inoculated bacteria was determined by measuring the number of viable bacteria using a plate medium. After the inoculum was added, the solution was circulated at room temperature using a pump.

  Comparative Example 1 (A) is a case where only porous ceramics is used as a carrier. The same procedure as in Example 1 was performed except that only porous ceramics was used as the microorganism carrier. Comparative Example 1 (B) is a case where only activated carbon is used as a carrier. The same procedure as in Example 1 was performed except that only activated carbon was used as the microorganism carrier. The results are shown in Tables 1 and 2.

  By comparing Example 1 with Comparative Example 1 in Table 1, it can be seen that bacteria are sterilized in a state where the liquid is circulating through the fixed bed of the porous ceramics and activated carbon mixture. It can be seen that sterilization of bacteria occurs in both porous ceramics and activated carbon. From comparison between Example 1 and Comparative Example 1, it can be seen that the porous ceramics and the activated carbon each have no bacteria sterilization effect, but rather bacteria are growing.

  Table 2 shows the results of a well water purification test (Example 2) using a fixed bed apparatus. The fixed bed used two treatment towers having a diameter of 500 millimeters and a height of 1 meter, and was filled with 200 liters per tower of porous ceramics and granular activated carbon mixed with the same weight. For about half a year, it was possible to continue sterilizing general bacteria and coliforms in about 50 tons of well water a day without exchanging porous ceramics and granular activated carbon.

  The sterilization effect can be obtained by passing water without using a special device. In addition to maintaining a constant flow rate with a pump or the like, water can be passed using a head or tap pressure, so water can be sterilized even in remote areas without electricity.

It is the schematic of the sterilization apparatus of the drinking water using a fixed bed. It is the schematic of the sterilization apparatus of the drinking water using a fluid bed.

Explanation of symbols

1,11 Treatment tower 2,12 Flange 3,13,14 Strainer 4,15 Drain valve 5,16 Air vent valve 6 To-be-treated water pipe 7 To-be-treated water pipe 8 Filter medium (fixed bed)
9,23 Treated water 10,24 Treated water 17 Circulating pipe 18 Circulating pump 19 Relay tank 20 Filter medium (fluidized bed)
21 Upper end of filter medium at rest 22 Upper end of filter medium at flow

Claims (26)

A mixed filter medium fixing step for fixing the filter medium mixed with porous ceramics and granular activated carbon so as not to move;
A potable water sterilization method comprising: a potable water-fixed filter medium passing step for passing potable water through the filter medium fixed in the mixed filter medium fixing step. A mixed filter medium fluidity holding step in which a filter medium in which porous ceramics and granular activated carbon are mixed is held in a state where it can move according to the flow of water;
A method for sterilizing potable water comprising: a potable water flow filter medium passing step for passing potable water through the filter medium held in the mixed filter medium flow holding step. A drinking water fixed filter medium passing step for passing drinking water through a filter medium fixed so as not to move by mixing porous ceramics and granular activated carbon;
A potable water sterilization method comprising: a drinking water flow filter medium passing step for allowing drinking water to pass through a filter medium in which a filter medium in which porous ceramics and granular activated carbon are mixed can move according to the flow of water. A drinking water flow filter medium passing step for allowing drinking water to pass through a filter medium held in a state in which a filter medium in which porous ceramics and granular activated carbon are mixed can move according to the flow of water;
A potable water sterilization method comprising: a potable water-fixed filter medium passage step for passing potable water through a filter medium fixed so that a filter medium in which porous ceramics and granular activated carbon are mixed does not move. A method for sterilizing potable water according to any one of claims 1, 3, or 4,
A method for sterilizing potable water in which the fixed porous ceramic has a particle size distributed between 1 mm and 15 mm and a granular activated carbon particle size distributed between 0.1 mm and 3 mm. A method for sterilizing potable water according to claim 2, 3 or 4,
A method for sterilizing potable water in which the porous ceramics and the granular activated carbon to be fluidly maintained both have a particle size distributed between 0.1 millimeters and 3 millimeters. A method for sterilizing potable water according to any one of claims 1, 3, or 4,
A method for sterilizing potable water, wherein the flow rate in the potable water filter medium passing step is any one of 0.5 mm to 6 mm per second. A method for sterilizing potable water according to any one of claims 1, 3, or 4,
A method for sterilizing potable water, wherein the flow rate in the potable water fixing filter medium passing step is any one of 1 mm to 4 mm per second. A method for sterilizing potable water according to any one of claims 1, 3, or 4,
A method for sterilizing potable water, wherein the flow rate in the potable water filter step is 2 mm to 3 mm per second. A method for sterilizing potable water according to any of claims 2, 3 or 4,
A method for sterilizing potable water, wherein the flow rate in the potable water flow filter medium passing step is any one of 3 millimeters to 10 meters per second. A mixed filter medium fixed bed formed by fixing a filter medium mixed with porous ceramics and granular activated carbon so as not to move;
A potable water sterilization apparatus comprising potable water-fixed filter medium passage means for allowing potable water to pass through the mixed filter medium fixed bed at a predetermined flow rate. A mixed filter medium fluidized bed in which a filter medium in which porous ceramics and granular activated carbon are mixed is held in a state where it can move according to the flow of water;
A potable water sterilization apparatus comprising potable water fluid filter medium passing means for allowing potable water to pass through the mixed filter medium fluidized bed at a predetermined flow rate. A mixed filter medium fixed bed for fixing a filter medium mixed with porous ceramics and granular activated carbon so as not to move;
Drinking water-fixed filter medium passing means for allowing drinking water to pass through the mixed filter medium fixed bed at a predetermined flow rate;
A mixed filter medium fluidized bed in which a filter medium mixed with porous ceramics and granular activated carbon is held in a state where it can move according to the flow of water;
Sterilization of potable water for allowing drinking water flowing through the mixed filter medium fluidized bed to pass through the mixed filter medium fluidized bed. Processing equipment. A mixed filter medium fixed bed for fixing a filter medium mixed with porous ceramics and granular activated carbon so as not to move;
Drinking water-fixed filter medium passing means for allowing drinking water to pass through the mixed filter medium fixed bed at a predetermined flow rate;
A mixed filter medium fluidized bed in which a filter medium mixed with porous ceramics and granular activated carbon is held in a state where it can move according to the flow of water;
Sterilized drinking water that has drinking water flowing filter medium passing means for passing drinking water through the mixed filter medium fluidized bed at a predetermined flow rate, and that allows the drinking water that has passed through the mixed filter medium fluidized bed to pass through the mixed filter medium fixed bed. Processing equipment. A sterilization apparatus for potable water according to any of claims 11, 13 or 14,
Sterilization of potable water in which the particle size of the porous ceramics fixed in the mixed filter medium fixed bed is distributed between 1 mm and 15 mm, and the particle size of the granular activated carbon is distributed between 0.1 mm and 3 mm. Processing equipment. A sterilization apparatus for potable water according to any one of claims 12, 13 or 14,
A potable water sterilization apparatus in which the porous ceramics and the granular activated carbon held in the mixed filter medium fluidized bed each have a particle size distributed between 0.1 millimeters and 3 millimeters. A sterilization apparatus for potable water according to any of claims 11, 13 or 14,
A potable water sterilization apparatus in which the flow rate in the drinking water-fixing filter medium passing means is between 0.5 mm and 6 mm per second. A sterilization apparatus for potable water according to any of claims 11, 13 or 14,
A potable water sterilization apparatus in which the flow rate in the drinking water-fixing filter medium passing means is any one of 1 mm to 4 mm per second. A sterilization apparatus for potable water according to any of claims 11, 13 or 14,
A potable water sterilization apparatus in which the flow rate in the drinking water-fixing filter medium passing means is any of 2 to 3 millimeters per second. A sterilization apparatus for potable water according to any one of claims 12, 13 or 14,
A potable water sterilization apparatus in which the flow rate in the drinking water flow filter medium passing means is from 3 millimeters to 10 meters per second. A sterilization apparatus for potable water according to any of claims 11, 13 or 14,
A sterilization apparatus in which the drinking water fixed filter medium passing means is a pump. A sterilization apparatus for potable water according to any one of claims 12, 13 or 14,
A potable water sterilization apparatus wherein the potable water flow filter medium passing means is a pump. A sterilization apparatus for potable water according to any of claims 11, 13 or 14,
A potable water sterilization apparatus wherein the potable water-fixed filter medium passage means utilizes a drop. A sterilization apparatus for potable water according to any one of claims 12, 13 or 14,
A potable water sterilization apparatus in which the potable water flow filter medium passage means uses a drop. A sterilization apparatus for potable water according to any of claims 11, 13 or 14,
A potable water sterilization apparatus in which the drinking water-fixed filter medium passage means uses tap water pressure. A sterilization apparatus for potable water according to any one of claims 12, 13 or 14,
A potable water sterilization apparatus wherein the potable water flow filter medium passage means uses tap water pressure.

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