JP2006271808A - Method and device of sterilizing circulation bath using steam and ozone - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To drastically reduce the growth of legionella bacteria in a bathtub of a circulation and filtration type. <P>SOLUTION: In a system of returning drain water from the bathtub to the bathtub 1 again after filtering the drain water with a filter 7, a clarification device 15 is arranged at an output side position of the filter 7. In the clarification device 15, a steam nozzle 24 for injecting steam and an ozone injection nozzle 25 for injecting ozone are provided. Then, by the injection of steam and that of ozone, inside of the system is sterilized and purified. The clarification device 15 is also provided with a heating steam nozzle 29 for sterilizing circulation water in the system with heat by heating the water to ≥65°C. In the case of this heat sterilization operation, the circulation water is circulated through a bypass piping 23 for bypassing the bathtub 1. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a circulation bath sterilization method and apparatus therefor having a circulation filtration type bathtub, and more particularly to a circulation bath sterilization method and apparatus capable of sterilizing a circulation pipe, which has been impossible in the past.

  In general, in a purification system for a circulating bath, a method is adopted in which wastewater discharged from a bathtub is sent to a filtration device and filtered, and filtered water filtered by the filtration device is returned to the bathtub through a heater such as a boiler. It has been. In this type of system, the organic matter in the hot water is decomposed by microorganisms that are secondarily generated in the filtration device. Among these microorganisms, Legionella and amoeba that is the host of Legionella are also included. It is possible that Legionella bacteria flow into the bathtub with hot water and infect the bather, causing pneumonia and the like.

Therefore, in some cases, a sterilization device has been proposed in which an ozone sterilization device for sterilizing the inside of the filter is provided in the filtration device so that the inside of the filter can be sterilized at all times.
Japanese Patent Laid-Open No. 11-57736

  The conventional circulating bath sterilizer is based on the idea that the entire system can be sterilized as long as even the inside of the filter of the filtering device can be sterilized. This also occurs in dirt remaining in the part and the like, and sterilization using only the filtration device does not guarantee that Legionella bacteria will not flow into the bathtub.

  The present invention has been made in view of the present situation, and an object thereof is to provide a sterilization method and apparatus for a circulating bath capable of sterilizing the entire system including the circulation pipe.

  Another object of the present invention is to enable sterilization in the system without any trouble even during bathing.

  Another object of the present invention is to make it possible to completely sterilize the entire system including the circulation pipe, which has been impossible in the past.

  Yet another object of the present invention is to allow more complete sterilization of the entire system.

  In order to achieve the above object, the present invention comprises: a circulation filtration type bathtub; a filtration device for filtering waste water from the bathtub; and a circulation pipe that connects the bathtub and the filtration device to form a circulation path. A circulating bath sterilization method, wherein a purification device is provided on the outlet side of the filtration device, and at least one of steam or ozone is injected into the purification device to sterilize filtered water. It is characterized by that.

  The present invention also includes a circulation filtration type bathtub; a filtration device that filters wastewater from the bathtub; a circulation pipe that connects the bathtub and the filtration device to form a circulation path; and both ends that are connected to the circulation pipe. A circulating bath sterilization method comprising a bypass pipe for bypassing the bathtub, wherein a purification device is provided on the outlet side of the filtration device, and at least one of steam or ozone is provided in the purification device. In addition to the injection, the purified water from the purification device is circulated through the circulation pipe through the bypass pipe for sterilization.

  The present invention is also characterized in that at least steam is injected into the purifier and the purified water flowing through the circulation pipe is heated to 65 ° C. or higher.

  The present invention also provides a circulation bath sterilizer comprising: a circulation filtration type bathtub; a filtration device that filters wastewater from the bathtub; and a circulation pipe that connects the bathtub and the filtration device to form a circulation path. In addition, a purification device is provided on the outlet side of the filtration device, and a steam nozzle for injecting steam into the purification device to sterilize filtered water, or ozone in the purification device. At least one of ozone injection nozzles for sterilizing filtered water is provided.

  The present invention also includes a circulation filtration type bathtub; a filtration device that filters wastewater from the bathtub; a circulation pipe that connects the bathtub and the filtration device to form a circulation path; and both ends that are connected to the circulation pipe. And a bypass bath sterilizing device for bypassing the bathtub, wherein a purification device is provided on the outlet side of the filtration device, and steam is injected into the purification device by adding steam into the purification device. Provided with at least one of a steam nozzle for sterilizing water or an ozone injection nozzle for sterilizing filtered water by injecting ozone into the purification device, and circulating the purified water from the purification device through the bypass pipe It is characterized in that it is sterilized by flowing it into a pipe.

  The present invention is also characterized in that a heating steam nozzle for heating the purified water flowing through the circulation pipe to 65 ° C. or more is provided in the purification device.

  The present invention is also provided with a steam nozzle in the purification device, and the steam nozzle passes through a shock wave region generated by the collapse of steam bubbles injected from the steam nozzle so that the entire amount of filtered water in the purification device passes through. It is characterized by being arranged in.

  The present invention is further characterized in that an ozone injection nozzle is provided in the purification device, and this ozone injection nozzle is arranged so that bubbles of ozone injected from the ozone injection nozzle are made fine in the impact region.

  The present invention relates to a circulating bath sterilization method comprising: a circulation filtration type bathtub; a filtration device that filters wastewater from the bathtub; and a circulation pipe that connects the bathtub and the filtration device to form a circulation path. In addition, a purification device is provided on the outlet side of the filtration device, and at least one of steam or ozone is injected into the purification device to sterilize the filtered water. The entire system including the sterilization can be performed.

  The present invention also includes a circulation filtration type bathtub; a filtration device that filters wastewater from the bathtub; a circulation pipe that connects the bathtub and the filtration device to form a circulation path; and both ends that are connected to the circulation pipe. A circulating bath sterilization method comprising a bypass pipe for bypassing the bathtub, wherein a purification device is provided on the outlet side of the filtration device, and at least one of steam or ozone is provided in the purification device. Since the sterilization is performed by injecting the purified water from the purification device to the circulation pipe via the bypass pipe, the sterilization in the system can be performed without any trouble even during bathing.

  The present invention also injects at least steam into the purification device and heats the purified water flowing through the circulation pipe to 65 ° C. or higher, thereby completely sterilizing the entire system including the circulation pipe, which has been impossible in the past. can do.

  The present invention also provides a circulation bath sterilizer comprising: a circulation filtration type bathtub; a filtration device that filters wastewater from the bathtub; and a circulation pipe that connects the bathtub and the filtration device to form a circulation path. In addition, a purification device is provided on the outlet side of the filtration device, and a steam nozzle for injecting steam into the purification device to sterilize filtered water, or ozone in the purification device. Since at least one of the ozone injection nozzles for sterilizing the filtered water is provided, the entire system including the circulation pipe can be sterilized by arranging a purification device on the outlet side of the filtration device. Can do.

  The present invention also includes a circulation filtration type bathtub; a filtration device that filters wastewater from the bathtub; a circulation pipe that connects the bathtub and the filtration device to form a circulation path; and both ends that are connected to the circulation pipe. And a bypass bath sterilizing device for bypassing the bathtub, wherein a purification device is provided on the outlet side of the filtration device, and steam is injected into the purification device by adding steam into the purification device. Provided with at least one of a steam nozzle for sterilizing water or an ozone injection nozzle for sterilizing filtered water by injecting ozone into the purification device, and circulating the purified water from the purification device through the bypass pipe Since the sterilization is performed by flowing through the piping, the sterilization in the system can be performed without any trouble even when taking a bath by providing the bypass piping.

  In the present invention, the purification apparatus is provided with a heating steam nozzle for heating the purified water flowing through the circulation pipe to 65 ° C. or higher, so that the entire system including the circulation pipe can be sterilized, and filtered water can be used. The steam sterilization can be performed more completely.

  The present invention is also provided with a steam nozzle in the purification device, and the steam nozzle passes through a shock wave region generated by the collapse of steam bubbles injected from the steam nozzle so that the entire amount of filtered water in the purification device passes through. Therefore, the entire amount of filtered water can be surely sterilized and purified with steam.

  In the present invention, an ozone injection nozzle is further provided in the purification device, and the ozone injection nozzle is disposed so that the bubbles of ozone injected from the ozone injection nozzle are refined in the shock wave region. Can be further improved.

The present invention will be described below with reference to the drawings.
FIG. 1 shows a circulating bath sterilizer according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a circulating filtration bathtub filled with hot water 2. A drainage pipe 4 connected to the drainage port 3, a three-way valve 5 and a drainage circulation pipe 6 are led from the filtration device inlet 8 to the filtration device 7.

  As shown in FIG. 1, the drainage circulation pipe 6 is provided with a roughing filter 9, a circulation pump 10 and a three-way valve 11 from the upstream side. In the filtration device 7, sand or a filter is provided. A filter medium 12 such as is disposed. Then, the filtered water filtered by the filter medium 12 is guided from the filtering device outlet 13 to the purifying device 15 via the circulating pipe 14 for filtered water, and is sterilized and purified by the purifying device 15.

  As shown in FIG. 1, the filtered water circulation pipe 14 is provided with a three-way valve 16, and this three-way valve 16 is connected to the circulation pump 10 outlet side of the drainage circulation pipe 6 via a backflow pipe 17. Connected to the position.

  As shown in FIG. 1, the purification device 15 is connected to a purified water inlet 19 of the bathtub 1 through a purified water circulation pipe 18. A flow rate adjustment valve 21 is connected to the purified water circulation pipe 18 from the upstream side. A water supply and hot water supply pipe 20 is connected and a three-way valve 22 is provided. And this three-way valve 22 is connected to the said three-way valve 5 via the bypass piping 23 for bypassing the said bathtub 1 at the time of the thermal sterilization of the system explained in full detail behind.

  On the other hand, as shown in FIG. 1, the purification device 15 is provided with a steam nozzle 24 for injecting steam to sterilize filtered water, and an ozone injection nozzle 25 for injecting ozone to sterilize filtered water. In addition, an ozonolysis device 27 is connected to the top end of the purification device 15 via an air vent valve 26.

  As shown in FIG. 1, the steam nozzle 24 is arranged so that the entire amount of filtered water in the purifier 15 passes through a shock wave region 28 generated by the collapse of steam bubbles injected from the steam nozzle 24. The ozone injection nozzle 25 is arranged so that the bubbles of ozone injected from the ozone injection nozzle 25 are refined in the shock wave region 28. By disposing the steam nozzle 24 as described above, the entire amount of filtered water in the purification device 15 can be sterilized and purified with steam, and the ozone injection nozzle 25 is configured as described above. By arranging it, the sterilization purification efficiency by ozone can be improved.

  Since the principle of sterilization and purification by steam is described in detail in the invention previously proposed by the present inventors (see Japanese Patent Application Laid-Open No. 2004-160437), the details are omitted to avoid duplication.

  As shown in FIG. 1, the purification device 15 is also provided with a heating steam nozzle 29 for heating the circulating water in the system excluding hot water in the bathtub 1 to 65 ° C. or more. 29 is connected to a steam source via a heating steam valve 30.

  In FIG. 1, reference numeral 31 denotes a drain pipe connected to the three-way valve 11, and reference numeral 32 denotes a drain reservoir, which are used during backwashing of the filtration device 7 described later.

  In FIG. 1, a solid line arrow indicates the flow of circulating water during normal operation, a broken line arrow indicates the flow of circulating water during thermal sterilization, and a chain line arrow indicates the flow of circulating water during backwashing. Hereinafter, the operation of the present embodiment will be described with reference to FIG.

  During normal operation, steam is injected into the purifier 15 from the steam nozzle 24 and ozone is injected from the ozone injection nozzle 25. As a result, the entire amount of filtered water in the purification device 15 is completely sterilized and purified.

  The purified water sent out from the purification device 15 is supplied to the bathtub 1 through the three-way valve 22 and the purified water inlet 19, and the drainage from the bathtub 1 is discharged from the drain port 3, the three-way valve 5, the roughing filter 9, and the circulation pump. 10, guided to the filtration device 7 through the three-way valve 11 and the filtration device inlet 8, and filtered by the filter medium 12 in the filtration device 7. Then, the filtered water filtered by the filtering device 7 is returned to the purification device 15 via the filtering device outlet 13 and the three-way valve 16.

  During the heat sterilization operation, steam is injected from the steam nozzle 24 into the purifier 15, ozone is injected from the ozone injection nozzle 25, and a large amount of steam is injected from the heating steam nozzle 29. Then, the filtered water in the purification device 15 is heated to 65 ° C. or higher by the steam from the heating steam nozzle 29.

  The heated purified water sent from the purification device 15 is guided to the filtration device 7 via the three-way valve 22, the bypass pipe 23, the three-way valve 5, the roughing filter 9, the circulation pump 10, the three-way valve 11 and the filtration device inlet 8. The entire filtration device 7 is heated to a high temperature of 65 ° C. or higher. As a result, not only the piping and piping equipment through which the heated purified water has flowed, but also the filtration device 7 is thermally sterilized.

  The high-temperature filtered water after the heat sterilization of the filtration device 7 is returned from the filtration device outlet 13 to the purification device 15 via the three-way valve 16, and at this time, the heat sterilization of the three-way valve 16 and the filtered water circulation pipe 14 is also performed. Will do.

  On the other hand, when the filter medium 12 in the filtration device 7 is backwashed, the three-way valve 5, the roughing filter 9, the circulation pump 10, the backwash pipe 17 and the three-way valve 16 are discharged from the bathtub 1 discharged from the drain port 3. Through the filter outlet 13 into the filter 7. Then, the backwash water after backwashing the filter medium 12 is discharged to the drain pool 32 via the filter device inlet 8, the three-way valve 11 and the drain pipe 31.

  Since the purification device 15 is provided on the outlet side of the filtration device 7 so as to sterilize and purify the circulating water, even if Legionella bacteria are discharged from the filtration device 7, this Legionella Bacteria are not sent to the bathtub 1 and a highly safe system is obtained.

  Further, during the heat sterilization operation, the high-temperature circulating water is circulated bypassing the bathtub 1, so that the system can be sterilized and purified without any trouble even during bathing.

(Experimental example 1)
The present inventors conducted the following experiment using a model circulation bathtub (total water amount of about 2 t) having the system configuration shown in FIG.
That is, under a chlorine control of 0.2 to 0.6 ppm, after providing a bathing period (organic matter accumulation period by bathing) of about one week, the injection of sodium hypochlorite was stopped, and an ultraviolet irradiation type purification device Several people took a bath while using. Then, after switching to a purifier (equivalent to the purifier 15) for injecting steam and ozone, an experiment for suppressing Legionella was performed. At that time, the input steam amount (0.5 MPa, 160 ° C.) was 10 kg / h, and the input ozone amount was 0.15 mg / liter. And the measurement result of Legionella bacteria shown in FIG. 2 was obtained.

  As apparent from FIG. 2, Legionella bacteria were observed in the filtration apparatus from the third day after the sodium hypochlorite addition was stopped, but Legionella bacteria were not observed at the purifier outlet and the bathtub. The effectiveness of arranging a purification device on the side was confirmed.

(Experimental example 2)
The present inventors also conducted experiments on the heating temperature and heating time for sterilizing Legionella, and obtained the results shown in FIG.

  As is clear from FIG. 3, it was found that a heating temperature of 65 ° C. or more and a heating time of 5 minutes or more are necessary to sterilize Legionella.

(Experimental example 3)
The inventors further heated the circulating water in the system once a day at 66 ° C. for 10 minutes using the model circulation bathtub used in Experimental Example 1, and used only the filtration device for the remaining period (purification device). The experiment was conducted to measure the occurrence of Legionella bacteria. And the result shown in FIG. 4 was obtained.

  As apparent from FIG. 4, compared with the case of the circulation operation using only the filtration device without using the purification device, the bath is simply heated at 66 ° C. for 10 minutes once a day in the system. It was confirmed that the generation of Legionella in Japan can be greatly reduced. It was also found that almost no Legionella bacteria were detected from the filter medium of the filtration device.

  As described above, the circulating bath sterilization method and apparatus therefor according to the present invention are useful as a sterilizing method and apparatus applied to facilities equipped with a circulation filtration type bathtub, and in particular, circulation piping that has been impossible in the past. It is suitable as a sterilization method and apparatus capable of performing sterilization.

1 is an overall configuration diagram showing a circulating bath sterilizer according to an embodiment of the present invention. It is a graph which shows the experimental result of Experimental example 1 which the present inventors implemented. It is a graph which shows the experimental result of Experimental example 2 which the present inventors implemented. It is a graph which shows the experimental result of Experimental example 3 which the present inventors implemented.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bathtub 2 Hot water 3 Drain outlet 4 Water distribution pipe 5,11,16,22 Three-way valve 6 Circulation pipe for drainage 7 Filtration apparatus 8 Filtration apparatus inlet 9 Roughing filter 10 Circulation pump 12 Filter medium 13 Filtration apparatus outlet 14 Circulation pipe for filtrate DESCRIPTION OF SYMBOLS 15 Purification apparatus 17 Backwash pipe 18 Water purification circulation pipe 19 Water purification inlet 20 Water supply hot water supply pipe 21 Flow control valve 23 Bypass piping 24 Steam nozzle 25 Ozone injection nozzle 26 Air vent valve 27 Ozone decomposer 28 Shock wave area 29 Heating steam nozzle 30 Heating steam Valve 31 Drain pipe 32 Drain reservoir

Claims (8)

  A circulating bath sterilization method comprising: a circulation filtration bathtub; a filtration device that filters wastewater from the bathtub; and a circulation pipe that connects the bathtub and the filtration device to form a circulation path, A circulating bath sterilization method, wherein a purification device is provided on the outlet side of a filtration device, and at least one of steam or ozone is injected into the purification device to sterilize filtered water.   A circulation filtration bathtub; a filtration device for filtering waste water from the bathtub; a circulation pipe that connects the bathtub and the filtration device to form a circulation path; and both ends are connected to the circulation pipe to bypass the bathtub A circulatory bath sterilization method comprising a bypass pipe, wherein a purification device is provided on the outlet side of the filtration device, and at least one of steam or ozone is injected into the purification device, and purification is performed. A circulating bath sterilization method, wherein purified water from the apparatus is sterilized by flowing through the bypass piping to the circulation piping.   3. The circulating bath sterilization method according to claim 2, wherein at least steam is injected into the purification device, and the purified water flowing through the circulation pipe is heated to 65 [deg.] C. or higher.   A circulating bath sterilizer comprising: a circulation filtration bathtub; a filtration device that filters wastewater from the bathtub; and a circulation pipe that connects the bathtub and the filtration device to form a circulation path. A purification device is provided on the outlet side of the filtration device, and a steam nozzle for injecting steam into the purification device to sterilize filtered water, or ozone is injected into the purification device to sterilize filtered water. A circulating bath sterilization apparatus comprising at least one of ozone injection nozzles to be performed.   A circulation filtration bathtub; a filtration device for filtering waste water from the bathtub; a circulation pipe that connects the bathtub and the filtration device to form a circulation path; and both ends are connected to the circulation pipe to bypass the bathtub A circulatory bath sterilization apparatus comprising a bypass pipe, wherein a purification device is provided on the outlet side of the filtration device, and steam is sterilized by injecting steam into the purification device into the purification device. At least one of a nozzle or an ozone injection nozzle for sterilizing filtered water by injecting ozone into the purification device is provided, and the purified water from the purification device is passed through the bypass pipe to the circulation pipe to sterilize A circulating bath sterilizer characterized by performing   6. The circulating bath sterilizer according to claim 5, wherein a heating steam nozzle for heating purified water flowing through the circulation pipe to 65 ° C. or higher is provided in the purification device.   The purification device includes a steam nozzle, and the steam nozzle is arranged so that the entire amount of filtered water in the purification device passes through a shock wave region generated by the collapse of steam bubbles injected from the steam nozzle. The circulating bath sterilizer according to claim 4, 5 or 6.   8. The circulation according to claim 7, wherein the purification device includes an ozone injection nozzle, and the ozone injection nozzle is arranged so that bubbles of ozone injected from the ozone injection nozzle are refined in an impact region. Bath sterilizer.