JPH09221807A - Method for preventing generation of dirt and odor of discharge pipe for stool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for effectively preventing the generation of dirt and odor due to the urea in a discharge pipe for stool. SOLUTION: A sterilizing water supplying means, which is provided with a tank for storing the sterilizing liquid and an electrolysis tank 10 or the like, is provided in the upstream side of a stool A1, and the sterilizing water is supplied to a discharge pipe A11 through the stool A1. Or, the sterilizing water is supplied to a connection part of the stool A1 and the discharge pipe A11 so as to directly supply the sterilizing water to the discharge pipe A11. Generation of ammonia is restricted and the adhesion of urea and the generation of odor is prevented by sterilizing the bacteria.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing dirt, such as urine stones, which causes clogging of a drainage pipe of a toilet bowl, and odor from the drainage pipe.

[0002]

2. Description of the Related Art Routine cleaning of a toilet bowl is usually performed by a manual cleaning device operated by a user's button or automatically when a person standing in front of the toilet bowl is detected and use of the toilet bowl is finished. It is performed by an automatic cleaning device that performs an operation of flowing clean water or middle water into the interior.

[0003]

[Problems to be Solved by the Invention] It is impossible to prevent urine stones and the like from gradually adhering to the toilet bowl or a pipe downstream from the toilet bowl by simply flowing water after using the toilet bowl, and clogging of the drainage pipe is prevented. There was a problem that it would occur. Further, there is a problem that the urine stone becomes a hotbed for bacterial breeding and gives off an odor, and the odor caused by ammonia etc. is generated even in the process of producing the urine stone. Since it is difficult to remove urine stones etc. once attached by ordinary cleaning, it is necessary to request a specialized contractor to remove urine stones, which is a heavy burden in terms of cost and the like.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a method for effectively preventing dirt and odor from urine stones and the like in a drain pipe. To do.

[0005]

In order to solve the above problems, the method for decontaminating and deodorizing a toilet drain pipe according to the present invention is to supply sterilizing water to a drain pipe connected downstream of the toilet bowl. This prevents the generation of dirt and odor in the drain pipe.

[0006]

[Function] Adhesion of urinary stones is considered to occur in the following processes. Generally, bacteria such as bacilli exist in the toilet bowl, and urea in urine is decomposed into ammonia and carbon dioxide by the action of the enzyme urease possessed by the bacteria. The ammonia produced at this time raises the pH of the mixed waste water composed of urine and wash water. When the pH increases, the solubility of calcium phosphate generated by the reaction of calcium ions and phosphate ions contained in urine decreases, and calcium phosphate precipitates together with organic components in toilets and drain pipes. This is urinary stone.

When the amount of ammonia produced from urea by the action of the enzyme urease is large, it causes odor.

In the present invention, the sterilizing water is caused to flow through the drainage pipe to sterilize the bacteria such as the above-mentioned rod-shaped bacteria existing in the drainage pipe, so that the cause of such urine stone adhesion is eliminated.
Therefore, the inside of the drainage pipe is always kept clean and odor is prevented.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, for supplying sterilizing water to a drain pipe, for example, (1) supplying sterilizing water to the drain pipe via a toilet, or (2) directly supplying sterilizing water. It is possible to supply it to the drain pipe.

When sterilizing water is supplied to the drain pipe via the toilet as in the above (1), the inside of the drain pipe can be sterilized and the toilet can be sterilized at the same time. Here, the applicant of the present application has proposed a toilet bowl cleaning method that effectively prevents the toilet bowl from becoming dirty by supplying sterilizing water to the toilet bowl (PC
T / JP95 / 01650). Therefore, the drainage pipe can be simultaneously sterilized by supplying sterilizing water to the toilet in accordance with the toilet cleaning method.

In this case, however, since the sterilizing water flows so as to replace the accumulated water in the toilet trap, a mixed liquid of a part of the sterilizing water and the trap accumulated water flows downstream from the toilet bowl. Here, even if the sterilizing water that was supplied last time is retained in the trap, depending on the type of sterilizing substance (hereinafter referred to as sterilizing component), if the sterilizing water is retained in the trap for a certain period of time or more, If the amount of newly supplied sterilizing water is small (for example, when it is intended to save water), only the liquid with a low concentration of sterilizing component is supplied to the drain pipe because the activity may be lost. It will be.
Therefore, in order to sufficiently sterilize the inside of the drainage pipe, supply a sufficient amount of sterilizing water so that new sterilizing water can flow to the drainage pipe, and increase the concentration of the sterilizing component in the sterilizing water in advance. At least one of the following conditions: keeping the sterilizing component, supplying new sterilizing water while the sterilizing component does not lose its activity, and selecting a sterilizing component that is less likely to lose its activity. It is necessary to meet.

On the other hand, if the sterilizing water is directly supplied to the drain pipe as in the above (2), the sterilizing water directly flows through the drain pipe without passing through the toilet bowl, so that the above conditions (1) to (4) are satisfied. Even without it, the inside of the drainage pipe can be effectively sterilized. To supply the sterilizing water directly to the drainage pipe, for example, the sterilizing water may be supplied to the connection portion between the toilet bowl and the drainage pipe downstream thereof. In this case, the sterilizing water may be supplied to the toilet bowl in association with the direct supply of the sterilizing water to the drain pipe or separately.

As means for supplying the sterilizing water, for example, a tank for storing the sterilizing liquid or a means for generating the sterilizing water such as an electrolyzer is provided on the upstream side of the toilet bowl. And / or supply to a toilet bowl.

In the present invention, by sterilizing the bacteria having urease in the body, the production of ammonia is suppressed, the increase in pH due to the dissolution of ammonia is suppressed, and the attachment of urinary stones is prevented, and the odor One cause is also prevented. As bacteria having urease in the body, general bacteria are basically all applicable. Among them, bacilli are particularly remarkably inhabited in toilet bowls.

In the present invention, as the bactericidal component in sterilized water, not only a substance having bactericidal properties but also a substance capable of inhibiting the enzymatic action of urease can be used. By using such a substance, the increase of urease due to live bacteria is suppressed, and the production of ammonia is suppressed. Therefore, the production of ammonia is suppressed, the increase in pH due to the dissolution of ammonia is suppressed, the adhesion of urine stones is prevented, and the cause of odor is also prevented.

Examples of the sterilizing component include free chlorine, bound chlorine, ozone, antibacterial metal or its ion, organic chlorine-based disinfectant, organic phosphoric acid-based disinfectant, peroxocarbonate ion or its salt, alcohol-based disinfectant. Etc.

Of these, free chlorine, combined chlorine, and ozone have a short life in water of at most about several weeks as compared with organic chlorine-based disinfectants, organic phosphoric acid-based disinfectants, etc., and therefore water pollution. It is preferable in that there is little risk of such problems.

Here, the free chlorine means hypochlorous acid and hypochlorite ion. Bound chlorine means monochloramine, dichloramine, trichloramine, etc. Among them, monochloramine and dichloramine are known to have bactericidal activity.

When free chlorine-containing water is used as sterilizing water, free chlorine has a high bactericidal activity even in a small amount and also has an effect of inhibiting the enzymatic action of urease, so that the production of ammonia is further suppressed, The increase in pH due to the dissolution of ammonia is suppressed, the adherence of urinary stones is prevented, and the cause of odor is also prevented.

Further, since the free chlorine-containing water is generated only by electrolyzing water containing chlorine such as tap water, it is generated only by arranging the electrolyzer upstream of the pipe, and it is not always necessary to provide a tank or the like. Therefore, it is space-saving, and there is little need for maintenance such as replacement of the liquid in the tank, which is safe for the user.

In the present invention, tap water means tap water,
Water obtained from tap water such as tap water, well water, and industrial water.

When the concentration of free chlorine is usually 0.1 mg / liter or more, preferably 0.5 mg / liter or more, the inside of the drainage pipe is sufficiently sterilized. Therefore, the increase of urease and the sticking effect based on the action of live bacteria are effectively suppressed, the increase of pH due to the dissolution of ammonia is suppressed, and the attachment of urinary stones is prevented, and the cause of odor is also prevented.

When acidic water containing free chlorine is used as sterilizing water, the adhesion and odor of urinary stones are further improved by the following actions. (1) Free chlorine has a high bactericidal activity in a small amount and also has an effect of inhibiting the enzymatic action of urease. (2) Since the pH does not easily reach 8 or more, uric acid made of calcium phosphate or the like does not easily adhere. (3) Free chlorine is present as hypochlorous acid (HClO) in acidity. In such a form, it is about 1 in comparison with the hypochlorite ion (ClO ⁻ ) which is an existing form in alkaline.
The bactericidal power is 0 times stronger. Therefore, the production of ammonia is suppressed, the increase in pH due to the dissolution of ammonia is suppressed, the adhesion of urine stones is prevented, and the cause of odor is also prevented.

When a liquid containing free chlorine is used, it is preferable to electrolyze and supply chlorine-containing water such as tap water, tap water, well water, and industrial water. This is because the liquid containing free chlorine is not suitable for storage because the amount of free chlorine gradually decreases when left standing.

In the electrolyzer, a diaphragm is provided between the anode and the cathode, or a slit is provided in the electrode of the non-diaphragm type electrolyzer (Japanese Patent Application No. 7-2065).
No. 40, disclosed in Japanese Patent Application No. 7-206541), a method in which alkaline water and acidic water are separately taken out and only acidic water is allowed to flow into a drain pipe, and all liquids electrolyzed as a diaphragmless electrolysis tank There is a method of draining to a drainage pipe. The method of flowing all the electrolyzed liquids into the drain pipe in the form of a diaphragm is preferable when a large amount of washing water is required at one time like a toilet unit in which a plurality of toilets are connected. On the contrary, the method of separating alkaline water and acidic water separately is to arrange it in the upstream of the water supply pipe in general households etc., to use the alkaline water for drinking and to flow the acidic water containing free chlorine to the drain pipe. Suitable for combination with.

The method of electrolyzing water containing chlorine ions is as follows:
In order to make the chlorine generation reaction more dominant than the oxygen generation reaction and improve the generation efficiency of free chlorine, an electrolyzer using a chlorine generation electrode is used at least as an electrode of the anode.

Here, the chlorine generation electrode is an electrode capable of inducing a chlorine generation reaction, and its basic structure is either an electroconductive substrate carrying a chlorine generation catalyst or a conductive chlorine catalyst. It is made of natural material. The conductive base material carrying the chlorine generation catalyst is advantageous in terms of manufacturing cost because the base material part having a structure can be made of inexpensive materials such as titanium and stainless steel.

Depending on the type of chlorine generation catalyst, for example, iron-based electrodes such as ferrite, palladium-based electrodes, ruthenium-based electrodes, iridium-based electrodes, platinum-based electrodes, ruthenium-
Examples include tin-based electrodes, palladium-platinum-based electrodes, iridium-platinum-based electrodes, ruthenium-platinum-based electrodes, and iridium-platinum-tantalum-based electrodes. In particular, when using tap water having a chlorine ion content in the chlorine ion-containing water of only about 3 to 40 ppm, it is very important to improve the generation efficiency of free chlorine in order to sterilize bacteria containing urease sufficiently. is there. From that viewpoint, an iridium-based electrode, an iridium-platinum-based electrode, an iridium-platinum-tantalum-based electrode, or the like is preferable. Further, in order to improve the life of the electrode, when a conductive base material carrying a chlorine generation catalyst is used, it is preferable that platinum is contained in the base material so that it can be fixed to the base material easily and is hardly detached.

The voltage applied to the electrodes in the electrolysis tank may be DC voltage or AC voltage. When the voltage applied to the electrodes is an AC voltage, it is desirable to use chlorine generation electrodes for both electrodes. In cases other than the above, the cathode electrode may be basically any conductive material. For example, using an inexpensive material such as iron or stainless steel is advantageous in terms of manufacturing cost.

When bound chlorine-containing water is used as the sterilizing water, the bound chlorine has a bactericidal activity and also has an effect of inhibiting the enzymatic action of urease, so that the production of ammonia is further suppressed and the dissolution of ammonia is dissolved. As a result, the increase in pH caused by the urine is suppressed and the adherence of urinary stones is prevented, and the cause of odor is also prevented.

Further, since it is produced only by electrolysis of water containing chlorine and organic nitrogen such as middle water and well water, it is not necessary to provide a tank etc. because it is produced only by arranging the electrolysis device upstream of the pipe. It saves space and reduces the need for maintenance such as liquid replacement in the tank. Further, since the intermediate water can be used as the raw material water, it is easy to cope with the case of a high-rise building, a factory, etc. that reuses the water. In addition, since bound chlorine is less likely to decompose spontaneously than free chlorine, it has the advantage that it has good residual properties. Furthermore, it has a strong bactericidal power that can completely eliminate bacteria with an action time (residence time) of about 5 minutes.

When ozone-containing water is used as the sterilizing water, the ozone-containing water has a sterilizing power and has an action of oxidizing ammonia, so that the production of ammonia by urease is suppressed, and the pH of the solution due to the dissolution of ammonia is suppressed. The rise is suppressed and the attachment of urinary stones is prevented, and also a cause of odor is prevented.

Further, since ozone-containing water can be obtained only by dissolution of ozone produced by silent discharge in water or by electrolysis of water, it is produced only by arranging a silent discharge ozone generator or electrolysis device upstream of the pipe. be able to. Therefore, since it is not necessary to provide a tank or the like, the space is saved, and the need for maintenance such as replacement of the liquid in the tank is reduced.

The ozone concentration in ozone-containing water is usually
0.01 mg / liter or more, preferably 0.05 mg
If it is more than 1 liter / liter, the inside of the drainage pipe is sufficiently sterilized. Therefore, the increase of urease due to the action of live bacteria is effectively suppressed, the increase of pH due to the dissolution of ammonia is suppressed, and the attachment of urinary stones is prevented, and the cause of odor is also prevented.

When water containing an antibacterial metal or its ions is used as the sterilizing water, the antibacterial metal or its ions have a bactericidal power, so that the production of ammonia by urease is suppressed and the pH of the solution due to the dissolution of ammonia is suppressed. The rise is suppressed and the attachment of urinary stones is prevented, and also a cause of odor is prevented.

Since the size of the atom or the ion of the antibacterial metal or its ion is small, the antibacterial life is exhausted when it is surrounded by organic substances or relatively large anions. However, compared with free chlorine and ozone, the bactericidal ability by instantaneous contact is low, but the antibacterial life is long, so it is difficult to lose the activity even after staying in the trap for a certain period of time, therefore,
The necessity of increasing the supply amount, concentration or supply frequency of the sterilizing water as described above is relatively small. Further, by merely disposing an antibacterial metal or a substance containing its ion in, for example, the trap portion, excellent sterilizing property is exhibited without supplying a new sterilizing component for a considerably long period of time.

Examples of the substance containing the antibacterial metal or its ion include the antibacterial metal or its ion itself and the compound containing the antibacterial metal or its ion or the substance carrying the antibacterial metal or its ion.

Antibacterial metals include silver, copper, zinc and the like, and as antibacterial metal or its ion carrier, glaze, glass, soluble glass, layered silicate, layered aluminosilicate, apatite, calcium phosphate. , Aluminum phosphate, zeolite, zinc oxide, iron oxide, titanium oxide and the like can be used. Among them, glaze, glass, apatite, calcium phosphate, aluminum phosphate, zinc oxide, iron oxide, and titanium oxide are particularly preferable because they have heat resistance even at the firing temperature of sanitary ware.

When the antibacterial metal ion is silver ion and the silver ion concentration is 1 μg / liter or more, preferably 10 μg / liter or more, the inside of the drainage pipe is sufficiently sterilized. Therefore, the increase of urease due to the action of viable bacteria is effectively suppressed, and the pH due to the dissolution of ammonia is suppressed.
Is suppressed and the attachment of urinary stones is prevented,
One of the causes of odor is also prevented.

When the antibacterial metal ion-containing water is water containing the antibacterial metal ions released by the antibacterial metal ion carrier, maintenance is performed only by exchanging the antibacterial metal ion carrier. It is safer and preferable. The antibacterial metal ion carrier can be arranged, for example, in the trap portion of the toilet bowl.

When the pH of the sterilized water is 5.5 or less, the following two effects occur, and it becomes more difficult for urine stones to adhere and ammonia to be produced. (1) The solubility of calcium phosphate is extremely low at a pH of 8 or more, but by setting the pH to 5.5 or less, the solubility of calcium phosphate is high, and urine stones are less likely to adhere. (2) It is said that the optimum activity pH of the enzyme urease is about 7. By adjusting the pH to 5.5 or less, the activity of the enzyme urease is greatly reduced, and ammonia is less likely to be produced.

However, if the acidity is strong, the pipe may be corroded, so that the pH is preferably 3 or higher.

As described above, when the sterilizing water is supplied to the drain pipe via the toilet bowl, the sterilizing water should be supplied in such an amount that new sterilizing water can sufficiently flow to the drain pipe. , Increase the concentration of sterilizing components in sterilized water in advance, supply new sterilizing water before sterilizing components lose their activity, select sterilizing components that are less likely to lose their activity It is necessary to satisfy at least one of the above conditions.

In order to satisfy the above conditions, it is necessary that the supply amount of sterilizing water is at least twice, preferably at least four times the capacity of the toilet trap. If the supplied amount of sterilizing water is at least the above level, the accumulated water in the toilet trap is sufficiently replaced (the replacement rate is about 95% or more), and new sterilizing water can sufficiently flow to the drain pipe.

To satisfy the above conditions, the concentration of the sterilizing component is set high in advance so that the concentration of the sterilizing component is sufficient even after the sterilizing water passes through the trap and is diluted with the accumulated water. It is necessary to leave. For example, the supply amount of sterilizing water is about twice the capacity of the toilet trap (replacement rate of about
%), The concentration of the bactericidal component after passing through the trap is about 53% before passing through the trap, so the concentration of the bactericidal component is previously set to a normal concentration (for example, 0.1 mg / ml in the case of free chlorine).
2 times or more, preferably 5 times or more (in the case of free chlorine, 0.2 mg / liter or more, preferably 0.5 mg / liter or more).

To meet the above conditions, for example, in the case of water containing free chlorine having a concentration of about 0.1 mg / liter, the next sterilizing water is supplied within about 5 hours, preferably within about 1 hour after the sterilizing water is supplied. It is necessary to supply. According to this, even if the sterilized water stays in the trap, it will flow to the drain pipe before its activity is lost. In the case of ozone-containing water having an ozone concentration of about 0.01 mg / liter, it is necessary to supply the next sterilizing water within about 5 hours, preferably about 1 hour after supplying the sterilizing water.

Examples of the above-mentioned bactericidal component which hardly loses its activity include the above-mentioned antibacterial metal ions, microorganism-supporting ceramics, and ceramics such as titania.

In the present invention, the sterilizing water can be supplied in the following manner, for example. (1) Supply sterilizing water to the drain pipe at predetermined time intervals (2) Supply sterilizing water to the drain pipe only at night (3) When sterilizing water is not used within a certain time after using the toilet Supply sterilizing water to the drain pipe (4) Supply sterilizing water to the drain pipe after each toilet cleaning after using the toilet (5) Disinfect sterilizing water to the drain pipe immediately after or immediately after the toilet cleaning after using the toilet Supply

Furthermore, in addition to the above methods (1) to (5), (6) a method of constantly supplying sterilizing water to a drain pipe is also possible.

As described in (1) above, by supplying the sterilizing water at a predetermined time interval, the live bacteria are intermittently killed and removed. It is possible to effectively prevent the growth and adherence of viable bacteria that grow. Therefore, the increase of urease due to the action of live bacteria is effectively suppressed, the increase of pH due to the dissolution of ammonia is suppressed, and the attachment of urinary stones is prevented, and the cause of odor is also prevented.

By supplying the sterilizing water only at night as in the above (2), for example, toilets for vehicles such as office buildings, department stores, station premises, exhibition halls, tourist facilities, and vehicles that operate only during the daytime. In toilets that are used only in the daytime and are rarely used at night, such as the toilets installed in
It is possible to prevent bacteria from multiplying in the pipe when the toilet is not used at night, and to prevent urease from increasing and sticking to the inner surface of the pipe, which in turn prevents urine stones from adhering and also contributes to odor.

As described above, when the sterilizing water is supplied only at night, first, for example, by flushing the cleaning water with an ordinary toilet bowl cleaning device to wash the drain pipe, the sterilizing water is supplied to the drain pipe. Good to do. According to this, most of the bacteria are removed from the drain pipe by washing with water, and sterilized water is then supplied to the toilet bowl to effectively sterilize the remaining bacteria.

When the sterilizing water is supplied only at night as described above, the sterilizing water is supplied at a high concentration or a large amount only at the first supply of the night, and at a second or subsequent night of the night, a lower concentration or a lower concentration is supplied. A small amount of sterilizing water may be supplied. Since the number of bacteria gradually increases in the daytime, the number of bacteria becomes maximum at the beginning of the night. Therefore, only at the beginning, it is necessary to perform sufficient sterilization with a high concentration or a large amount of sterilized water. However, since the growth rate of bacteria is low at night, sufficient sterilization can be performed only by supplying a low concentration or a small amount of sterilizing water after sufficient sterilization is performed in this manner.

By supplying sterilized water only at night at predetermined time intervals, for example, in an office building,
For toilet bowls that are used only during the daytime and rarely used at night, such as those installed in department stores, station premises, exhibition halls, tourist facilities, and toilets for vehicles that operate only during the daytime. The situation in which bacteria multiply and urease increases and adheres to the inner surface of the pipe is prevented, which in turn prevents urine stones from adhering and also contributes to odor. Further, by supplying intermittently, sterilizing water can be saved.

Also in this case, similarly to the above, it is advisable to first flush the wash water to wash the drain pipe, and then supply the sterilizing water. Alternatively, the sterilizing water may be supplied at a high concentration only when it is first supplied at night, and the sterilizing water having a lower concentration than that may be supplied at the second and subsequent nights.

As described in (3) above, sterilized water is supplied to the drain pipe when the toilet is not used within a certain time after the toilet is used, so that bacteria will grow in the pipe when the toilet is not used. The situation in which urease increases and adheres to the inner surface of the pipe is prevented, which in turn prevents urine stones from adhering and also contributes to odor.

By supplying sterilized water to the drain pipe at a predetermined time interval when the toilet is not used within a certain time after the toilet is used, bacteria grow in the pipe when the toilet is not used and urease Is prevented from adhering to the inner surface of the pipe, which in turn prevents urine stones from adhering and also prevents odor. Further, by supplying intermittently, sterilizing water can be saved.

The sterilizing water may be supplied to the drain pipe only when the toilet is not used within a certain time after using the toilet only at night.

As described in (4) above, sterilizing water is supplied to the drain pipe every time the toilet is washed after use of the toilet, so that urine does not remain in the pipe, and bacteria are removed. Since the growth is prevented and urease is not increased, the production of ammonia is effectively suppressed, and thus the adherence of urinary stones is prevented, and the cause of odor is also prevented.

As described in (5) above, sterilizing water is supplied to the drain pipe just before or immediately after the toilet cleaning after the toilet is used, so that the inside of the drain wetted by the cleaning water after the toilet is used. Bactericidal substances (such as free chlorine) spread widely on the surface. As a result, the inner surface of the drain pipe is effectively sterilized,
The increase of urease is prevented, the production of ammonia is effectively suppressed, and thus the attachment of urinary stones is prevented, and the cause of odor is also prevented.

As described in (1) to (5) above, by supplying the sterilizing water for a limited time, a high power saving effect and a high water saving effect can be obtained. In particular, when sterilizing water obtained by electrolyzing tap water (for example, water containing free chlorine) is used, the cumulative time of electrolysis should be shortened by supplying the sterilizing water for a limited time as described above. Can extend the life of the electrode,
Therefore, the frequency of electrode replacement can be reduced.

On the other hand, if the sterilizing water is constantly supplied to the drainage pipe as in the above (6), the sterilization can be performed by supplying the sterilizing water having a low concentration or a small amount, and as described above. When sterilizing water is supplied to a drain pipe via a toilet, the sterilizing water is supplied to the drain pipe without losing its activity because the sterilizing water does not stay in the trap and is constantly flowed.

By supplying the sterilizing water to the drainage pipe as described in (1) to (6) above, the production of ammonia is effectively suppressed, and the generation of dirt and odor such as urine stones adhering to the drainage pipe is effective. It is possible to prevent it. Furthermore, when sterilizing water (for example, water containing free chlorine) obtained by electrolyzing tap water is used, it is not necessary to separately supply a sterilizing agent, which is advantageous in terms of maintenance.

The free chlorine concentration of the water containing free chlorine flowing into the drainage pipe is 0.2 μg / liter or more, preferably 0.02 m.
When it is set to be g / liter or more, the inside of the drainage pipe is sufficiently sterilized. Therefore, the increase of urease and the sticking effect based on the action of live bacteria are effectively suppressed, the increase of pH due to the dissolution of ammonia is suppressed, and the attachment of urinary stones is prevented, and the cause of odor is also prevented.

When the number of bacteria in the drainage pipe increases, urinary stones adhere to the inner surface of the drainage pipe due to the above-mentioned process. However, since this urinary stone is porous, water is likely to stay in the pores and bacteria are Easy to grow. As described above, when the number of bacteria increases, a vicious circle occurs in which an environment for further increasing the number of bacteria is formed. However, by keeping the number of bacteria in water such as water droplets on the inner surface of the drainage pipe at less than 1 × 10 ⁴ CFU / ml at all times, this vicious cycle is cut off and urine stones do not adhere to the drainage pipe. can do. Therefore, when sterilizing water is passed through the toilet bowl, the number of bacteria in the water in the drainage pipe should always be 1 × 10 ⁴ CFU.
It is desirable to aim to keep below / ml. For this purpose, the sterilizing water may be constantly made to flow into the drain pipe, or the sterilizing water may be made to flow after the normal washing water is made to flow. When sterilizing water is always supplied to the drainage pipe, the target of the number of bacteria can be achieved by setting the concentration of free chlorine to 0.2 μg / liter or more. When sterilizing water is supplied to the drain pipe after the cleaning water is supplied by normal toilet cleaning, the free chlorine concentration is set to 0.
By setting the amount to 02 mg / liter or more, the above-mentioned target of the number of bacteria can be achieved.

The sterilizing water is made to flow when the toilet is not used for a predetermined time after cleaning the toilet after using the toilet, and at that time, the sterilizing water to be drained to the drain pipe first has a free chlorine concentration of 0.1 mg / liter. Even if the above-mentioned water containing free chlorine is used, the above-mentioned target of the number of bacteria can be achieved.

In addition, the sterilizing water is allowed to flow into the drain pipe only at night, and the sterilizing water to be first supplied to the drain pipe at night is a free chlorine-containing water having a free chlorine concentration of 0.1 mg / liter or more. However, the above-mentioned target of the number of bacteria can be achieved.

Most of the bacteria in the drainage pipe are removed by the conventional cleaning which is usually performed after the toilet is used. However, since sterilization is not performed in the conventional washing, the bacteria existing in the drainage pipe gradually grow. For example, in the case of an office building, the water containing free chlorine is flushed at 3:00 am the day before, the number of bacteria is reduced to 0, and then only normal cleaning is continued until 10:00 pm
Meanwhile, when used properly, the number of bacteria increases with time. Thus, since the number of bacteria increases while the toilet bowl is used relatively frequently, it means that the number of bacteria is highest at the first cleaning when the toilet bowl is not used. Therefore, at this time, sufficient sterilization is performed by flowing a slightly higher concentration of free chlorine-containing water of 0.1 mg / liter or more. However, since the growth speed of the bacteria is low while the toilet is not used, it is sufficient to flow a lower concentration of free chlorine-containing water thereafter. This allows
The power consumption for electrolysis can be reduced and the life of the electrode can be extended.

FIG. 1 is a schematic diagram showing the structure of a sterilizing water supply device which is an example of means for supplying sterilizing water. In the sterilizing water supply device shown in the same figure, a continuous electrolysis tank 10 having at least a pair of electrodes, a flow path formed between the electrodes, and a liquid inlet and a liquid outlet communicating with the flow passage,
Through the first branch pipe 20, it is connected to a position upstream of the water supply valve 40 including a flush valve of the toilet cleaning water supply pipe 30. An on-off valve 50 composed of a solenoid valve or the like is arranged on the way of the first branch pipe 20. Continuous electrolysis tank 10
Is connected to a position downstream of the water supply valve 40 of the toilet flush water supply pipe 30 via the second branch pipe 60. The toilet cleaning water supply pipe 30 to which the second branch pipe 60 is connected is the urinal A.
1 connected. Control device 70 with built-in timer
Is connected to the electrolysis tank 10 and the on-off valve 50.
The water supply valve 40 is connected to a known toilet bowl automatic cleaning system B1.

In this device, the opening / closing valve 50 is appropriately opened by the control device 70 based on the instruction of the timer, and the water is supplied from the toilet cleaning water supply pipe 30 upstream of the water supply valve 40 through the first branch pipe 20 to the water supply. Water flows into the flow path formed between the electrodes of the continuous electrolysis tank 10. Simultaneously with or when the opening / closing valve 50 is opened, a voltage is applied between the electrodes by the control device 70, and tap water flowing in the flow path formed between the electrodes of the continuous electrolysis tank 10 is electrolyzed. To produce free chlorine-containing water. The generated free chlorine-containing water flows through the second branch pipe 60 into the toilet flushing water supply pipe 30 at a position downstream of the water supply valve 40, and flows into the drain pipe A11 via the urinal A1. As a result, the drainage pipe A11 is appropriately sterilized together with the toilet bowl A1, so that the deposition of urine stones is prevented, and not only the urinal A1 but also the drainage pipe A11 is prevented from becoming dirty and odorous.

Independently of the operation of this device, the tap water is flushed into the urinal A1 each time it is used, by the operation of the automatic toilet bowl cleaning system B1 or by manual operation, and the surface of the urinal A1 and the drain pipe A11. The inner surface of is washed with water, and the accumulated water in the toilet trap and the drain pipe A11 is replaced.

In this sterilizing water supply device, since free chlorine-containing water that is sterilizing water is generated by electrolysis of tap water, this device requires less maintenance,
It is also safe for the user.

In the present apparatus, based on the instruction of the timer, the control device 70 opens the open / close valve 50 at a predetermined time interval, and the control device 70 causes the open / close valve 50 to open between the electrodes at the same time or with a slight delay. When a voltage is applied and the tap water flowing through the flow path formed between the electrodes of the continuous electrolysis tank 10 is electrolyzed to generate water containing free chlorine, live bacteria are killed intermittently, Since it is removed, it is possible to effectively prevent the growth and fixation of live bacteria adhering to the toilet bowl and the water pipe from the outside air or the like. Therefore, the increase of urease and the sticking effect based on the action of live bacteria are effectively suppressed, the increase of pH due to the dissolution of ammonia is suppressed, and the attachment of urinary stones is prevented, and the cause of odor is also prevented. In addition, by intermittent electrolysis, the life of the electrodes in the electrolyzer can be improved, and the need for maintenance can be further reduced. Further, the amount of tap water and electricity is saved as compared with the case of always flowing, so that resource saving and energy saving are possible.

In the present apparatus, based on the instruction of the timer, the control device 70 opens the on-off valve 50 only at night, and at the same time as or slightly delays the on-off valve 50 being opened, the control device 70 causes the voltage between the electrodes to be increased. Is applied to electrolyze the tap water flowing through the flow path formed between the electrodes of the continuous electrolysis tank 10 to generate free chlorine-containing water, for example, in office buildings, department stores, station premises. , Toilets that are used only in the daytime and are rarely used at night, such as toilets installed in exhibition halls, tourist facilities, and toilets that operate only during the daytime. It prevents bacteria from multiplying and urease increasing and sticking to the surface of the toilet bowl or the inner surface of the water pipe, which in turn prevents the attachment of urinary stones and also contributes to odor. It is locked. In the daytime, every time the toilet is used or at a predetermined time interval, tap water is flushed to the urinal A1 independently of the operation of the sterilizing water supply device, by the operation of the toilet automatic cleaning system B1, or manually. Since the surface of the urinal A1 and the inner surface of the water pipe A11 are washed with water to replace the accumulated water, bacteria do not propagate in the accumulated water and urease does not increase.

In this case, based on the instruction of the timer, the control device 70 opens the open / close valve 50 at predetermined time intervals only at night, and the control device 70 opens the open / close valve 50 at the same time or with a slight delay. When a voltage is applied between the electrodes to electrolyze the tap water flowing through the flow path formed between the electrodes of the continuous electrolysis tank 10 to generate free chlorine-containing water, the electrodes in the electrolyzer The life of the device is further improved, and the need for maintenance can be further reduced. Further, the amount of tap water and electricity is saved as compared with the case of always flowing, so that resource saving and energy saving are possible, which is preferable.

In this apparatus, the following may be carried out.
The control device 70 is connected to the toilet bowl automatic cleaning system B1, and the signal is sent from the controller device 70 to the toilet bowl automatic cleaning system B1.
To be able to perform regular toilet cleaning. And
When the free chlorine-containing water is flowed only at night as described above, first, the control device 70 sends a cleaning signal to the toilet automatic cleaning system B1 to flow the cleaning water to the toilet. This replaces the stagnant water in the toilet bowl and water pipe and eliminates most of the bacteria. After that, the control device 70 opens the opening / closing valve 50 as described above, and simultaneously or slightly delays it, and applies a voltage between the electrodes. Then, the tap water flowing through the flow path formed between the electrodes of the continuous electrolysis tank 10 is electrolyzed to generate free chlorine-containing water, which is flowed through the toilet bowl A1 to the drain pipe A11. Thereby, the remaining bacteria are sufficiently sterilized.

In this apparatus, the control device 70 is further connected to the toilet bowl automatic cleaning system B1, the operation signal of the toilet bowl automatic cleaning system B1 is input to the controller device 70, and the controller device 70 is operated by the operation signal of the toilet bowl automatic cleaning system B1. When the toilet is not used within a fixed time after the toilet is used by the control device 70, that is, within a predetermined time after the urinal A1 is used and the operation signal of the automatic toilet cleaning system B1 is output, the timer is started. When the operation signal of the toilet bowl automatic cleaning system B1 is not output, the opening / closing valve 50 is opened based on the instruction of the timer, and at the same time as the opening / closing valve 50 is opened or slightly delayed, the voltage is applied between the electrodes by the control device 70. Is applied, the tap water flowing through the flow path formed between the electrodes of the continuous electrolysis tank 10 is electrolyzed, and free chlorine-containing water is generated. It preferred because the same effect as also described above so as to be obtained. In this method, the effect of resource saving and energy saving is the greatest.

In this apparatus, the control device 70 is also connected to the toilet bowl automatic cleaning system B1 so that the toilet bowl automatic cleaning system B is connected.
The operation signal of No. 1 is input to the control device 70, and the operation signal of the toilet automatic cleaning system B1 causes the control device 70 to wash the toilet bowl every time the toilet is used, that is, the urinal A1 is used. Each time the operation signal is output, the on-off valve 50 is opened, and a voltage is applied between the electrodes by the control device 70 at the same time when the on-off valve 50 is opened or with a slight delay according to the instruction of the timer. When tap water flowing in the flow path formed between the electrodes of the electrolysis tank 10 is electrolyzed to generate free chlorine-containing water, sterilization of urea and inhibition of the enzymatic action of urease are performed together with the supply of urea. Therefore, the production of ammonia is effectively suppressed, and thus the attachment of urinary stones is prevented and the cause of odor is also prevented.

Further, compared with the case of always flowing, the life of the electrode in the electrolyzer can be improved, the need for maintenance can be further reduced, and the amount of tap water and electricity can be saved. This is preferable because it enables energy saving.

In this apparatus, the control device 70 is also connected to the toilet bowl automatic cleaning system B1 so that the toilet bowl automatic cleaning system B
The operation signal of No. 1 is input to the control device 70, and the timer of the control device 70 is started by the operation signal of the automatic toilet bowl cleaning system B1 so that the control device 70 immediately before or after the end of the toilet cleaning after using the toilet. , Ie urinal A
1 is used, the operation signal of the toilet automatic cleaning system B1 is output, and then the opening and closing valve 50 is opened based on the instruction of the timer with a slight delay, and the controller 70 controls the inter-electrode gap every time the opening and closing valve 50 is opened. Even if a voltage is applied to the electrolyzed tap water flowing through the flow path formed between the electrodes of the continuous electrolysis tank 10 to generate free chlorine-containing water, the toilet bowl is cleaned after use. Immediately after or immediately after the end of the procedure, the free chlorine-containing water comes to flow into the toilet bowl and the drain pipe. Spread widely. As a result, the surface of the toilet bowl and the inner surface of the drainage pipe are effectively sterilized, and the increase of urease is prevented, so that the production of ammonia is effectively suppressed, which in turn prevents the attachment of urinary stones and contributes to odor. Will also be prevented.

In the present apparatus, a flow rate control valve may be provided instead of the opening / closing valve 50 on the way of the first branch pipe 20. The control device 70 opens the flow control valve at a predetermined time and sets it to a predetermined opening. If the opening of the flow control valve is increased, the amount of tap water flowing into the continuous electrolyzer 10 per unit time also increases, the concentration of free chlorine produced by electrolysis decreases, and if the opening decreases. The inflow of tap water also decreases and the concentration of free chlorine increases. As described above, when the flow rate control valve is used instead of the opening / closing valve 50, the concentration of free chlorine can be adjusted by the method of flow rate control.

In the apparatus shown in FIG. 1, free chlorine-containing water is supplied to the drain pipe A11 via the urinal A1. For example, one end of another branch pipe may be inserted in the middle of the second branch pipe 60. Connect the other end of this branch pipe to urinal A1 and drain pipe A
You may make it connect to the connection part with 11. Alternatively, the second branch pipe 60 may be connected directly to the connecting portion between the urinal A1 and the drainage pipe A11 without connecting to the toilet flush water supply pipe 30. With such a configuration, the water containing free chlorine can be directly supplied to the drain pipe A11.

Further, the storage tank for storing the water containing free chlorine produced in the continuous electrolysis tank 10 is a second branch pipe 6
It may be provided on the way to 0, and the control device 70 may appropriately supply the free chlorine-containing water stored in the storage tank. As a result, a large amount of free chlorine-containing water can be supplied all at once, and the sterilizing effect in the toilet bowl and drainage pipe is enhanced. In particular, when the free chlorine-containing water is supplied to a plurality of toilet bowls, a large amount of the stored free chlorine-containing water can be supplied at once to each toilet bowl, so this effect is remarkable.

Furthermore, a pumping means such as a pump for pumping the free chlorine-containing water stored in the storage tank to the toilet bowl A1 may be provided. As a result, the free chlorine-containing water easily diffuses in the toilet bowl A1 and the drain pipe A11,
The bactericidal effect is enhanced. Also, diffusion allows effective sterilization with a small amount of free chlorine-containing water, which also saves water.

Further, it is desirable to provide means for warning the abnormality of the electrolysis tank 10. As a means for warning the abnormality of the electrolysis tank 10, for example, an LED lamp or the like is used, and a warning lamp, a buzzer or the like configured to turn on, off or blink only when there is an abnormality is exemplified. Further, such warning means is provided at a position that can be recognized from the outside (a position that can be recognized from the outside when the sterilizing water supply device is installed). Thereby, for example, it is possible to easily check the presence or absence of abnormality in the electrolysis tank 10 without removing the case housing the device.

Routinely checking the electrolysis tank 10 for abnormalities is important in using the sterilizing water supply device. For example, when some abnormality such as a voltage increase occurs in the electrolysis tank 10 and its function is lost, the tap water that has passed through the electrolysis tank 10 is supplied to the toilet bowl A1 without being electrolyzed. become. Where toilet bowl A
It is usually difficult to recognize that the water supplied to No. 1 has not been electrolyzed, unless there is a warning means as described above. In this case, tap water that has not been electrolyzed continues to be supplied as sterilizing water, and as a result, a situation occurs in which urine stones or the like become abnormal and notice. Therefore, by checking the presence or absence of abnormality of the electrolysis tank 10 by the above-mentioned warning means on a daily basis, it is possible to prevent the situation in which urine stones and the like are generated without being noticed as described above.

Furthermore, the continuous electrolysis tank 10 may be provided in series with the water supply valve 40 on the way of the water supply pipe 30 for cleaning the toilet bowl, whereby a device having a simpler structure is provided. be able to. In this case, the toilet bowl A1 of the water containing free chlorine generated in the continuous electrolysis tank 10
The toilet can be supplied to the toilet at the same time as the toilet cleaning performed by the automatic toilet cleaning system B1 when the toilet is used, or immediately before or immediately after the toilet cleaning. This makes it possible to provide a low-cost sterilizing water supply device having a more simplified piping and control system.

The means for supplying the sterilizing water is not limited to the above-mentioned device, and may be, for example, PCT / JP95 / 01.
Any of the devices disclosed in 650 (including those that supply ozone-containing water) can be used. The sterilizing water supply device may be configured as a single unit to be retrofitted to an existing toilet bowl or toilet bowl (Japanese Patent Application No. 7-266346). Or a sterilizing water supply device,
The toilet unit, the water supply pipe, the drain pipe, the control valve, and the like, and the decorative plate that covers them may be combined together to form a toilet unit (Japanese Patent Application No. 7-266347).

[0089]

【Example】

Example 1 As shown in FIG. 2, tap water was introduced into a diaphragmless continuous electrolysis tank 100 having a plate-shaped electrode, and a chlorine generation electrode in which a titanium plate was coated with an iridium oxide-platinum catalyst was used. The tap water is electrolyzed using, and the free chlorine-containing water produced by electrolysis is supplied to the urinal through a pipe different from the washing pipe system of the urinal A10 (trap capacity 510 ml) in which four urinals are connected. Drainage pipe A11 downstream of sink and urinal
An effect confirmation test for investigating stains on the inner surface of No. 0 was conducted. In this test, a transparent pipe was used as the drain pipe A110, and the state of the inner surface of the drain pipe A110 was made visible from the outside. In addition, the drain pipe from the urinal and the drain pipe from the urinal merge with the drain pipe from the urinal and the drain pipe from the urinal, respectively.

In this test, the amount of flush water supplied to each of the urinals was 2 liters / time, and the amount of flush water supplied to each of the urinals was 1 liter / time. (However, there was almost no use of toilet bowl at night). The urinal was supplied with free chlorine-containing water separately from the cleaning water supply for each use. The supply amount of free chlorine-containing water was 2 liters / cycle, and the free chlorine concentration was 1 ppm for both urinals. The supply frequency of water containing free chlorine is 10:00 pm and 3: 0 at night.
It was set to 0 am (twice / day). Further, in the urinal, when the free chlorine-containing water was supplied, the free chlorine-containing water was flushed immediately before to replace the accumulated water in the trap of the urinal.

One month after starting the use of the above urinal, the drainage pipe from the urinal is connected to the drainage pipe from the urinal and the part III which is slightly downstream from the confluence of the drainage pipe from the urinal and the drainage pipe from the urinal. Observation of the IV portion, which is on the way and slightly upstream of the confluence with the drain pipe from the urinal, was as schematically shown in FIGS. 3 and 4, respectively.

As shown in FIG. 3, it can be seen that yellow stains, which are considered to be urinary stones, are attached to the inner surface of the drainage pipe A110 in the part III. Part III is supplied with free chlorine-containing water through a urinal, but this free chlorine-containing water is also diluted with free chlorine-free wash water from the urinal so that it is diluted with free chlorine. It is probable that the concentration was insufficient, or that the number of bacteria in Part III was high due to flush water flowing from the urinal, resulting in contamination.

As shown in FIG. 4, part IV (washing section)
In Fig. 6, no dirt is found on the inner surface of the drain pipe A110, and it is recognized that the drain pipe A110 is in a clean state. Water containing free chlorine was supplied to the IV section through a urinal, and it is considered that the sterilization was sufficiently performed.

Further, after continuing the use of the urinal, and two months after the start of use, the drain pipe from the urinal is on the upstream side of the part where the drain pipe from the urinal joins the drain pipe and the urinal. When the vicinity of the II portion on the upstream side of the IV portion on the way of the drainage pipe from was observed, it was as schematically shown in FIG.

As shown in FIG. 5, in the part I (unwashed area), it can be seen that yellow stains, which are considered to be urine stones, are attached to the inner surface of the drainage pipe A110. It is considered that this was caused by the fact that chlorine-containing water did not flow. On the other hand, in the II section (washing section), drainage pipe A11
No dirt was found on the inner surface of No. 0, and it is recognized that the inner surface was clean. Part II was supplied with water containing free chlorine via a urinal, and it is considered that the sterilization was sufficiently performed. From FIG. 5, the difference in the antifouling effect depending on the presence or absence of the supply of free chlorine-containing water can be seen particularly clearly.

Example 2 In order to examine the bactericidal action of free chlorine in the retained water, a predetermined number of E. coli was added to water containing free chlorine at a predetermined concentration, and after 20 seconds, sodium thiosulfate was added to release it. The chlorine was removed and the viability of the bacteria was examined.

The results are shown in FIG. In FIG. 6, the abscissa is the bactericidal activity, that is, the reciprocal of the survival rate of the bacteria, and the ordinate is 1 m of free chlorine.
The number of bacteria that can be sterilized is shown per g. From FIG. 6, it was found that the number of bacteria that can be sterilized per 1 mg of free chlorine is constant and is 2.5 to 5 × 10 ¹⁰ regardless of the sterilizing power. Therefore, the amount of free chlorine for sterilizing bacteria 1 × 10 ⁴ CFU / ml is 0.2 to
It becomes 0.4 μg / liter, and it is considered that the amount of bacteria in the accumulated water can be maintained at less than 1 × 10 ⁴ CFU / ml by adding more than 0.4 μg / liter.

Example 3 In order to examine the sterilizing action of silver ions in the retained water, silver nitrate was dissolved in ion-exchanged water so as to be 1 mg / liter in terms of silver weight, and further diluted with sterilized ultrapure water to give a predetermined amount. A test solution having a silver ion concentration was prepared. However, the test solutions with silver ion concentrations of 1 mg / liter and 10 mg / liter,
It was prepared by directly dissolving in sterile ultrapure water. 2 × 10 ⁵ CFU / ml of Escherichia coli (E. coli) was added to the above test solution, and after leaving for a predetermined time, potassium iodide was added to precipitate silver ions as silver iodide and removed from the test solution. , The survival rate of the bacteria was determined.

The results are shown in FIG. As a result, if the silver ion concentration is 1 mg / liter or more, the survival rate of the bacterium can be 10% or less even if the action time is about 20 seconds, but if the silver ion concentration is about 1 μg / liter, the bacterium can be left to act for about 1 hour. The survival rate was not less than 10%.

On the other hand, in the case of long-term side, in the case of silver ion, the tendency of decrease in effect was not recognized even if the action time was lengthened. Therefore, even when it is used for a drainage pipe, it can be said that it is preferable to act slowly in accumulated water or the like.

Example 4 To examine the bactericidal action of silver ions in stagnant water, silver nitrate was dissolved in ion-exchanged water so as to be 100 mg / liter in terms of silver weight, and further diluted with water in a low tank of a toilet to give a predetermined amount. A test solution having a silver ion concentration was prepared. 2 × 10 ⁵ CFU of E. coli was added to the test solution.
/ ML, the mixture was allowed to stand for a predetermined time, potassium iodide was added to precipitate silver ions as silver iodide, and the silver ions were removed from the test solution to determine the viability of the bacteria.

The results are shown in FIG. The action time was 2 hours. As a result, it was found that the viability of the bacterium can be 10% or less if it is 1 μg / liter or more in terms of silver weight in the test solution. Therefore, it can be said that even when it is actually used for a drainage pipe, if it is used for a long time, it can be sterilized sufficiently and colored stains can be prevented.

Example 5 A solution obtained by adding 20 ppm of ammonia nitrogen to tap water was electrolyzed to produce 2.8 ppm of bound chlorine. Pseudomonas aeruginosa (P. aerugino) was added to 25 ml of this solution so that the bacterial concentration became 2 × 10 ⁷ CFU / ml.
sa) was mixed and allowed to stand for a predetermined time, after which the chlorine content was recovered with sodium thiosulfate, and then the viable cell count was determined. FIG.
As shown in (1), under these conditions, the bacteria were almost completely killed by contacting with bound chlorine for 5 minutes.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the configuration of a sterilizing water supply device which is an example of a means for supplying sterilizing water.

FIG. 2 is a configuration diagram of equipment such as a toilet bowl when the effect confirmation test of the present invention is performed using a sterilizing water supply device including a continuous electrolysis tank.

FIG. 3 is a diagram showing how the drainage pipe is soiled after one month has passed in the test according to FIG.

FIG. 4 is a diagram showing how a drain pipe is soiled after one month has passed in the test according to FIG.

FIG. 5 is a diagram showing how the drainage pipe is soiled after two months have passed in the test according to FIG.

FIG. 6 is a graph showing the relationship between the number of bacteria that can be sterilized by 1 mg of free chlorine and the sterilizing power of water containing free chlorine.

FIG. 7 shows the number of remaining bacteria after allowing silver ion-containing water to act on Escherichia coli.

FIG. 8 shows the number of remaining bacteria after allowing silver ion-containing water to act on Escherichia coli for 2 hours.

FIG. 9 is a view showing a bactericidal effect (initial number of bacteria / surviving number of bacteria) when acting water containing bound chlorine on Pseudomonas aeruginosa.

[Explanation of symbols]

 10 ... Continuous electrolysis tank 20 ... First branch pipe 30 ... Water supply pipe for toilet cleaning 40 ... Water supply valve 50 ... On-off valve 60 ... Second branch pipe 70 ... Control device A1 ... Urinal A11 ... Drain pipe B1 ... Toilet automatic Cleaning system

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Masahiro Yano Inventor Masahiro Yano 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Totoki Equipment Co., Ltd. (72) Kenji Tabata, 2 Nakajima, Kitakyushu-ku, Kitakyushu, Fukuoka 1-2-1 Totoki Co., Ltd. (72) Inventor Tomonori Tomonori 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu, Kitakyushu, Fukuoka Prefecture (72) Inventor Shono Nobuhiro Shono Kokura, Kitakyushu, Fukuoka 2-1-1 Nakajima, Kita-ku Totoki Co., Ltd. (72) Inventor Yukio Takano 2-1-1 1-1 Nakajima, Kokurakita-ku, Kitakyushu, Fukuoka Prefecture

Claims (9)

[Claims] 1. A method for preventing generation of dirt and odor in a drain pipe by supplying sterilizing water to a drain pipe connected downstream of a toilet bowl. 2. The method according to claim 1, wherein the sterilizing water is supplied to the drain pipe at predetermined time intervals. 3. The method according to claim 1, wherein the sterilizing water is supplied to the drain pipe only at night. 4. The sterilizing water is supplied to the drain pipe when the toilet is not used within a certain time after the toilet is used.
The method according to any of the above. 5. The method according to claim 1, wherein the sterilizing water is supplied to the drain pipe every time the toilet is cleaned after the toilet is used. 6. The method according to claim 5, wherein the sterilizing water is supplied to the drain pipe immediately before or after the end of the toilet cleaning after use of the toilet. 7. The sterilizing water is constantly supplied to the drain pipe.
The method described in. 8. The method according to claim 1, wherein sterilized water obtained by electrolyzing tap water is used. 9. The method according to claim 1, wherein the toilet bowl is a toilet bowl unit in which a plurality of toilet bowls are connected in parallel.