JP2005288392A - Method for controlling water quality - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a novel method for controlling the water quality of a swimming pool and a public bath. <P>SOLUTION: This method for controlling water quality is constituted in such a way that an aqueous chlorous acid solution or an aqueous hypochlorous acid solution, or an aqueous solution a salt of these acids of an effective chlorine concentration of 50-300 ppm with adjusted pH 5 to 7 on a hydrochloric-acid acidity is charged to the swimming-pool water after filtration after measuring not only the effective chlorine concentration but also pH circulating water before filtration in circulation, that the amount of the above chlorous acid aqueous solution charged or hypochlorous acid aqueous solution charged, or the aqueous solution of the salt charged, in particular an aqueous solution of the sodium salt charged to the swimming-pool water is adjusted in accordance with the above measured values, and that the swimming-pool water is controlled within the range of a predetermined effective chlorine concentration in a weak acid region of pH 5 to 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pool management method or a bathtub management method, which is a public health problem.

Pool management is mainly performed by adding sodium hypochlorite, but hypochlorite ions are consumed by disinfection of various fungi supplied from the body of swimmers and decomposition of protein and ammonia components. . In addition, since it is alkaline, it needs to have a high concentration in order to have sufficient bactericidal activity, has a odor of chlorine, is uncomfortable, and has skin irritation and atopic dermatitis such as inflammation. Occur. In addition, since the addition to the pool is often performed at a high concentration without being sufficiently stirred, the concentration of effective chlorine concentration is likely to be formed in the pool, and the above-described inconvenience is likely to occur.
In the bathtub, a 24-hour bath for home use has gained popularity, but has declined due to the influence of Legionella bacteria. On the other hand, since public baths require 24-hour operation due to the popularity of hot springs, various sterilization facilities and methods are used. However, the present situation is that a simple and appropriate sterilization method cannot be found, and it relies on a method using an oxidizing agent such as ozone gas or chlorine gas, but these methods harm the bathing atmosphere due to chlorine odor, There are difficulties in handling.
In particular, since the effective chlorine concentration in pool water and bath water fluctuates rapidly depending on the number of users, it cannot be said that batch-type management of several times a day is sufficient.
Water purification technology (issued July 10, 2002 by Gihodo Publishing)

Therefore, a first object of the present invention is to provide a water quality management method that can quickly respond to changes in the effective chlorine concentration of pool water and bathtub water, and has no chlorine odor and is gentle to the skin.
The second object of the present invention is to provide a management method capable of easily and appropriately performing sterilization or sterilization of Legionella bacteria or the like rooted in the circulation piping of a pool and a bathtub.

As a result of diligent research, the inventors of the present invention pay attention to the fact that pool water is circulated and filtered for 6 to 8 turns per day, and bath water is circulated for 3 to 4 turns per hour. Based on the measured value of the effective chlorine concentration before filtration of the circulating water, the chlorinated acid or hypochlorous acid aqueous solution having an effective chlorine concentration of 50 to 300 ppm in the weakly acidic region of pH 5 or more and 7 It was found and completed that the entire pool and tub could be adjusted very quickly when the salt solution was injected.
In the sterilization management of the pool for collecting the pool water from the pool, measuring the effective chlorine concentration of the pooled water collected from the pool, and returning the pool to the pool after filtration, and appropriately adjusting the effective chlorine concentration,
Not only the effective chlorine concentration of the pool water before filtration, but also the step of measuring the pH, and the effective concentration of hydrochloric acid 50 to 300 ppm adjusted to the pool water after filtration, preferably acidic with hydrochloric acid and weakly acidic with a pH of 5 or more and 7 or less A step of injecting an aqueous solution of chlorous acid or hypochlorous acid or a salt solution thereof, and an injection amount of the chlorous acid or hypochlorous acid solution or a salt solution thereof into pool water circulating according to the measured value. The pool management method is characterized by adjusting and adjusting pool water to a predetermined effective chlorine concentration, for example, in a range of 0.4 to 1 ppm in a weakly acidic region of pH 5 or more and 7 or less.

In addition, the present invention provides a circulation process for collecting bathtub water from a bathtub and returning it to the bathtub after filtration, and measuring the effective chlorine concentration of the bathtub water collected from the bathtub, and appropriately adjusting this effective chlorine concentration to sterilize the bathtub. In
Not only the effective chlorine concentration of the bath water before filtration, but also the step of measuring the pH, and the post-filtration bath water is preferably acidic with hydrochloric acid, with an effective chlorine concentration of 50 to 300 ppm adjusted to a weak acidity of pH 5 to 7. Includes the step of injecting a chlorous acid or hypochlorous acid aqueous solution or a salt solution thereof, and adjusting the injection amount of the chlorous acid or hypochlorous acid solution or the salt solution into the bath water circulating according to the measured value. In the bathtub management method, the bath water is adjusted to a predetermined effective chlorine concentration, for example, in the range of 0.2 to 0.4 ppm and 1 ppm or less in a weakly acidic region of pH 5 or more and 7 or less.

  The above management method automatically increases or decreases the injection amount of chlorous acid or hypochlorous acid aqueous solution or its salt aqueous solution into the circulating water, or ON / OFF the injection based on the effective chlorine concentration of the circulating water before filtration and the pH measurement signal. Is preferable, and includes a step of making a part of the effective water concentration 30 to 100 ppm in a weakly acidic region of pH 5 or more and 7 or less when circulating the pool water or bath water, and circulating this in the circulation path of the pool water or bath water. Is preferred.

  The chlorous acid or hypochlorous acid aqueous solution used in the present invention can be prepared by diluting a high concentration aqueous solution, and pH may be prepared with an acid such as hydrochloric acid as necessary. Examples of the salt aqueous solution include potassium, calcium, and sodium salts. It is preferable to use sodium chlorite or sodium hypochlorite aqueous solution that is acceptable as a food additive.

  According to the present invention, for example, an aqueous solution of chlorous acid or hypochlorous acid or a salt solution thereof, which is acidic with hydrochloric acid, has a pH of 5 or more and 7 or less, and has an effective chlorine concentration of 50 to 300 ppm, is injected into the filtered circulating water. Since it is returned to the pool or bathtub, it is a weakly acidic region without using a highly concentrated sodium hypochlorite solution as in the conventional case, so that it is effective at 0.4 to 1 ppm or 0.2 to 0.4 ppm. High sterilization ability can be maintained with oxygen concentration. Therefore, a favorable situation can be formed for the skin environment of pool users and bathers such as atopic dermatitis.

  Further, according to the method of the present invention, since weakly acidic chlorous acid or hypochlorous acid aqueous solution or its salt aqueous solution is injected and mixed and diluted in the filtered circulating water, there is no chlorine odor and there is a problem due to chlorine injection. There is almost no generation of halomethane. In addition, since the pool water to be returned can ensure a clean water state having no chlorine concentration, a good water quality environment can be formed.

  Furthermore, in the management method of the present invention, it is easy to effectively use part of the circulating water as appropriate, and to form circulating water having an effective chlorine concentration of 30 to 100 ppm within a weakly acidic range of pH 5 to 7. If necessary, sterilization or sterilization of Legionella bacteria or the like that tends to take root in the circulation pipe can be performed.

[Example 1]
FIG. 1 is a schematic view showing a pool management system. A pool 1 is formed with a circulation path 2 for turning all the water eight times every day. A filtration device 3 is arranged on the path 1, and the circulation water is once filtered. Returned to pool 1. Conventionally, the filtered circulating water is controlled so as to be adjusted to a predetermined effective chlorine concentration of 0.4 to 1 ppm by mixing a sodium hypochlorite concentrate. In the present invention, a measuring device 5 that measures the pH and effective chlorine concentration of circulating water is provided in front of the filtering device 3 in the circulation path 2, and a chemical injection port 4 is provided at the rear of the filtering device 3. A weakly acidic sodium hypochlorite or sodium hypochlorite aqueous solution having a pH of 5 or more and 7 or less and a pH of 5 to 7 at hydrochloric acid of ˜300 ppm, preferably 100 to 200 ppm, is injected. When the circulating water pH or effective chlorine concentration is outside the predetermined range, the injection of weakly acidic chlorous acid or hypochlorous acid or a salt solution thereof is stopped by the measurement signal detected by the measuring device 5 or the flow rate The switching device 6 is operated so that the injection flow rate can be adjusted.

  The weakly acidic sodium chlorite or sodium hypochlorite aqueous solution can be prepared by the mixer 10. For example, in the case of a sodium hypochlorite aqueous solution, this mixer 10 mixes sodium hypochlorite concentrated solution sent from the chemical solution tank 11 and hydrochloric acid sent from the chemical solution tank 12 at a constant ratio and is pumped from the water supply system 13. This mixed solution is diluted with tap water, and a hypochlorite aqueous solution containing a predetermined effective chlorine concentration is prepared in a weakly acidic region having a pH of 5 or more and 7 or less. In addition, 14 is an alarm device that monitors the operation status of the mixer.

  In the above management system, the pool water is normally circulated and filtered at 6 to 8 circulation turns per day, but this pool water should be adjusted to a pH range of 6 to 6.5 and an effective chlorine concentration of 0.4 to 1 ppm. Can do.

  In the drawing, a chlorous acid or hypochlorous acid aqueous solution or a salt aqueous solution thereof adjusted by the mixer 10 is not only supplied to the drug inlet 4 as described above, but also poolside or via a branch path 7. The floor sprinkler hose 8 is communicated with a dilution device 9. Here, an effective chlorine concentration of 30 to 100 ppm can be obtained by diluting a chlorous acid or hypochlorous acid aqueous solution or a salt solution thereof as it is or by diluting.

[Example 2]
FIG. 2 is a schematic diagram showing a public bath management system having a plurality of bathtubs, and circulates various bathtub waters of boys 'bathtubs 20-1 to 20-5 through circulation paths 22-1 to 22-5 and a girls' bathtub 21. -1 to 21-5 are also circulated through the circulation paths 22-1 to 22-5, and the circulating water is filtered by the filtering devices 23-1 to 23-5 provided in the circulation paths. It has become.

  50 to 300 ppm, preferably 100 ppm hydrochloric acid in each of the injection passages 25-1 to 25-5 having the chemical injection ports 24-1 to 24-5 behind the filtration devices 23-1 to 23-5 in each circulation path. A weakly acidic sodium chlorite or sodium hypochlorite aqueous solution having an acidity of pH 5 to 7 is injected. When the circulating water pH or effective chlorine concentration is outside the specified range, the injection of weakly acidic chlorous acid or hypochlorous acid aqueous solution or its salt aqueous solution is intermittently increased by the measurement signal detected by a measuring device (not shown). Or the injection flow rate may be adjustable.

  The weakly acidic sodium chlorite or sodium hypochlorite aqueous solution can be prepared by the mixer 26. This mixer 26 is, for example, a mixture of sodium hypochlorite concentrated solution sent from the chemical solution tank 26-1 and hydrochloric acid sent from the chemical solution tank 26-2 at a constant ratio, and tap water fed from the water supply system 27 by this tap water. Dilute the mixture and prepare a chlorous acid or hypochlorous acid aqueous solution or salt solution containing a predetermined effective chlorine concentration in a weakly acidic region with a pH of 5 or more and 7 or less, and once chlorite or hypochlorous acid The solution is stored in an aqueous solution or a salt solution tank 28 and supplied to the drug inlet.

  Further, in the drawing, the chlorous acid or hypochlorous acid aqueous solution or its salt aqueous solution prepared by the mixer 26 is not only supplied to the medicine inlets 24-1 to 24-5 as described above, but also branched. It communicates with a floor watering hose 30 via a path 29 via a diluting device 31. Here, an effective chlorine concentration of 30 to 100 ppm can be obtained by diluting a chlorous acid or hypochlorous acid aqueous solution or a salt solution thereof as it is or by diluting.

  On the other hand, 32 is an alarm device that monitors the operation status of the mixer. When the circulating water has a pH or effective chlorine concentration outside the predetermined range in the control panel 33, the necessary injection pumps 34-1 to 34-5 are intermittently operated by the detected measurement signal to weakly acidify. Aqueous solution of chlorous acid or hypochlorous acid or a salt solution thereof can be injected into the drug inlets 24-1 to 24-5.

  In the above injection management system, the bath water is circulated and filtered in a circulation turn once per hour, and this circulated water has an effective chlorine concentration of 0.2 to 0.4 ppm in the range of pH 6 to 6.5. Can be adjusted to the range.

In the above-mentioned system, since it is injected after being diluted and mixed to a specified concentration, there is no odor compared to the case where sodium hypochlorite is added directly to the pool.
Moreover, after diluting and mixing chlorous acid, hypochlorous acid or its soda salt to a certain concentration, and adjusting the pH of the appropriate acidic effective chlorine concentration, the pool water can be made alkaline as in the conventional method. Absent. Accordingly, maintenance and management of pool water without any trouble are facilitated even for people with skin hypersensitivity and atopic dermatitis.

  Furthermore, there is no danger in the conventional chlorine injection method, and there are no problems such as the concentration of chlorine and the shift to the alkali side at the water temperature. Moreover, since the generation amount of trihalomethane decreases, the transparency of pool water can be ensured without performing ozone sterilization.

  As described above, according to the present invention, the sterilization and deodorization of pool water and bath water can be performed quickly and constantly under acidic conditions, so that it is convenient for the skin, and water regeneration management preferable for public health is possible.

It is the schematic which shows the management system of a pool. . It is a schematic diagram which shows the management system of a super public bath.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pool 3 Circulation filtration apparatus 4 Chemical inlet 10 Mixer 11, 12 Chemical liquid tank 13 Water supply systern

Claims (4)

In the circulation process of collecting pool water from the pool, returning it to the pool after filtration, and measuring the effective chlorine concentration of the pool water collected from the pool, and appropriately adjusting this effective chlorine concentration,
In addition to the effective chlorine concentration of the pool water before filtration, the pH is measured, and the filtered pool water is adjusted to a weak acidity of pH 5 to 7 with an effective chlorine concentration of 50 to 300 ppm or Including a step of injecting an aqueous solution of chlorous acid or a salt solution thereof, adjusting an injection amount of the aqueous solution of chlorous acid or hypochlorous acid or a salt solution thereof to the circulating pool water according to the measured value, and having a pH of 5 or more and 7 A pool management method comprising adjusting pool water to a predetermined effective chlorine concentration range in the following weakly acidic region. In the sterilization management of the bathtub that collects bathtub water from the bathtub, returns it to the bathtub after filtration, measures the effective chlorine concentration of the bathtub water collected from the bathtub, and adjusts this effective chlorine concentration as appropriate,
The process of measuring not only the effective chlorine concentration of the bath water before filtration, but also pH, and chlorous acid or hypochlorous acid having an effective chlorine concentration of 50 to 300 ppm adjusted to weak acidity of pH 5 to 7 in the filtered bath water Including a step of injecting a chloric acid aqueous solution or a salt aqueous solution thereof, and adjusting the injection amount of the chlorous acid or hypochlorous acid aqueous solution or the salt aqueous solution into the bath water circulating according to the measured value, and having a pH of 5 or more and 7 or less The bathtub management method is characterized in that the bathtub water is adjusted to a predetermined effective chlorine concentration range in a weakly acidic region.   3. The method according to claim 1, further comprising a step of setting a part of the pool water or the bath water to an effective chlorine concentration of 30 to 100 ppm in a weakly acidic region having a pH of 5 or more and 7 or less and circulating the same to the circulation path of the pool water or the bath water. Management method. The amount of injection of the chlorous acid or hypochlorous acid aqueous solution or its salt aqueous solution into the circulating water is automatically increased or decreased according to the measurement signal of the effective chlorine concentration and pH of the circulating water before filtration. 2. The management method according to 2.

Images