JP2006314969A - Reservoir rain water sterilization system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reservoir rain water sterilization system having a small expense for the operation of the system and capable of maintaining a fixed bactericide concentration by a compact configuration with a necessary lowest limit. <P>SOLUTION: This reservoir rain water sterilization system includes a dissolving vessel 8 having a water soluble bactericide 9, during the operation of a pump 5 for pumping up rain water 11 from a rain water reservoir 3, the rain water 11 pumped up by this pump 5 is partially poured into the dissolving vessel 8 for a fixed time to dissolve the water-soluble bactericide 9, and a dissolved liquid 26 dissolving the water-soluble bactericide 9 is returned to the rain water reservoir 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stored rainwater sterilization system that can maintain a constant disinfectant concentration with a minimum required compact configuration and that does not require an inexpensive and large-scale device.

  In recent years, due to increasing awareness of effective use of water resources, many methods for rainwater storage and rainwater use have been proposed. Rainwater itself contains almost no harmful components, but there are contaminants such as dirt and dead insects on the roof and fence that collect rainwater. For this reason, even if rainwater was removed with a filter or the like, it was not possible to completely prevent microorganisms such as general bacteria from mixing in the stored water.

  Therefore, a system for storing rainwater and utilizing it where the user touches is provided with a mechanism for sterilizing and disinfecting rainwater flowing into the storage tank (see, for example, Patent Document 1).

Moreover, as another sterilization method of rainwater, a method is known in which rainwater is circulated in the storage tank after taking out the stored water in the storage tank and sterilizing (see, for example, Patent Document 2).
Japanese Patent No. 3151550 Japanese Patent No. 2920455 (page 5-7, Fig. 1)

  However, in the rainwater sterilization method in Patent Document 1, since the amount of rainwater flowing into the storage tank is not constant, the concentration of the sterilizing agent in the storage tank is not constant. When the process is repeated, there is a problem that the bactericide is excessively injected.

  Moreover, in the rainwater sterilization method in Patent Document 2, there is a problem that the circulation and sterilization system of rainwater takes up a lot of space, and the cost for running the circulation sterilization increases.

  It is an object of the present invention to provide a stored rainwater sterilization system that can maintain a constant disinfectant concentration and that does not require an inexpensive and large-scale apparatus.

The present invention has been made in view of the above circumstances, and the invention according to claim 1 is
A rainwater storage tank for storing rainwater and a pump for pumping and pouring rainwater from the rainwater storage tank and sterilizing rainwater in the rainwater storage tank, wherein a water soluble disinfectant is added. While the pump is driven, a part of rainwater pumped up by the pump is poured into the dissolver for a certain period of time to dissolve the water-soluble disinfectant, and the water-soluble disinfectant is dissolved. The dissolved solution is recirculated to the rainwater storage tank.

  According to a second aspect of the present invention, there is provided a branch pipe for injecting a part of rainwater discharged from the discharge port of the pump into the dissolver, and a branch pipe provided in the branch pipe for a certain period of time while the pump is driven And a solenoid valve that opens.

  According to a third aspect of the present invention, the dissolver is divided into two container chambers by an overflow dam, the water-soluble disinfectant is placed in one container chamber, and the branch tube is provided in the other container chamber. The rainwater is poured, and when the amount of rainwater in the other container chamber reaches a predetermined amount or more, the rainwater flows over the overflow weir to one container chamber.

  The invention according to claim 4 is characterized in that a draining bar is arranged at the bottom of the one container chamber, and the water-soluble disinfectant is placed on the draining bar.

  The invention of claim 5 is characterized in that the water-soluble disinfectant is a trichloroisocyanuric acid tablet.

According to the inventions according to claim 1 and claim 2, the rainwater pumped by the pump is provided while the pump is provided with a dissolver containing a water-soluble disinfectant and pumps up the stored water in the rainwater storage tank. A portion of the water is poured into the dissolver for a certain period of time to dissolve the water-soluble disinfectant, and the solution in which the water-soluble disinfectant is dissolved is circulated to the rainwater storage tank. A certain amount can be injected into the tank,
Moreover, since a part of the rainwater pumped up by the pump is poured into the dissolver for a certain period of time, the stored rainwater sterilization system can maintain a constant disinfectant concentration with the minimum required compact configuration. Can be realized.

  According to a third aspect of the present invention, the dissolver is partitioned into two container chambers by an overflow dam, the water-soluble disinfectant is placed in one container chamber, and the other container chamber Rainwater is injected by the branch pipe, and when the amount of rainwater in the other container chamber reaches a predetermined amount or more, rainwater flows over the overflow weir to one container chamber. The amount of water flowing into one container chamber at the time of water injection can be made constant, and the wave applied to the disinfectant can be made constant.

  According to the invention described in claim 4, the draining bar is arranged at the bottom of the one container chamber, and the water-soluble disinfectant is placed on the draining bar. It is possible to suppress generation of a concentrated solution due to contact with the bottom surface of the container chamber and water remaining at the interface. Further, by raising the water-soluble disinfectant from one bottom surface, it is possible to dissolve the disinfectant by a certain amount by rainwater at a certain water level injected into the container chamber.

  Further, according to the invention described in claim 5, since the trichloroisocyanuric acid tablet, which is the water-soluble disinfectant, has low solubility in water among the chlorine disinfectants, a low chlorine concentration can be stably maintained over a long period of time. A stored rainwater sterilization system using a chlorine-based disinfectant can be suitably constructed.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 shows a stored rainwater sterilization system according to the present invention.

  In FIG. 1, reference numeral 1 is a water collecting section, 2 is a trough that sends rainwater collected by the water collecting section 1, and 3 is a rainwater storage tank that stores the collected rainwater.

  The water collecting section 1 collects rainwater 11a, 11a that has fallen on the roofs 10, 10 by eaves ridges 12, 12, and further flows them to the drain pipe 13 by ridges 2, 2 connected to the eaves ridges 12, 12 respectively. Yes.

  A storage pipe 15 extending downward is connected to the middle of the drain pipe 13, and a filter 16 is disposed along a connection portion between the storage pipe 15 and the drain pipe 13. Therefore, most of the rainwater 11a flowing through the drain pipe 13 is filtered by the filter 16 and stored in the rainwater storage tank 3, and a part of the rainwater 11a flows into the sewage.

  The rainwater storage tank 3 is provided with a pumping pipe 17 for pumping up the rainwater 11 stored in the rainwater storage tank 3, and the upper part of the pumping pipe 17 is connected to the main pipe 4.

  A pump (hereinafter referred to as a water-use pump) 5 is connected to the main pipe 4. A discharge pipe 5 a of the water-use pump 5 has a use pipe 19 having a water supply port 19 a through a nipple pipe 18, a branch pipe 6, Is connected. One end of the branch pipe 6 is a water injection pipe 20 and is connected to the dissolver 8.

  The branch pipe 6 is provided with an electromagnetic valve 7, which is operated and opened only for a certain time in conjunction with the operation of the water-use pump 5. Thereby, the rain water 11 in the rain water storage tank 3 is poured into the dissolver 8 from the water injection pipe 20.

  The dissolver 8 is divided into two container chambers, that is, a water injection chamber 22 and a disinfectant dissolution chamber 23 by an overflow weir 21.

  In the sterilizing agent dissolution chamber 23, a water-soluble sterilizing agent 9 housed in a dedicated medicine cylinder 24 is disposed. As the water-soluble disinfectant 9, for example, a solid disinfectant trichloroisocyanuric acid tablet (Ponsilol B-90H manufactured by Shikoku Kasei Co., Ltd.) is used.

  The dedicated medicine cylinder 24 is placed on a drainage bar 25 disposed on the bottom 8 a of the dissolver 8. Note that a plurality of holes (not shown) through which rainwater in the sterilizing agent dissolution chamber 23 can enter the special medicine cylinder 24 are provided in the bottom 24 a of the special medicine cylinder 24.

  A return pipe 27 that circulates the solution 26 in the disinfectant dissolution chamber 23 into the rainwater storage tank 3 is connected to the bottom 8 a of the disinfectant dissolution chamber 23.

[Action]
Next, the operation of the stored rainwater sterilization system configured as described above will be described.

  Rainwater 11a that has fallen on the roof 10 is collected by the eaves 12 and 2 and filtered by the filter 16 and then stored in the rainwater storage tank 3.

  When the water-use pump 5 is operated to use the rainwater 11 in the rainwater storage tank 3, the electromagnetic valve 7 is operated for a certain time in conjunction with this, and a certain amount of the rainwater 11 passes through the branch pipe 6. Then, water is poured into the water pouring chamber 22 of the dissolver 8.

  When the amount of rainwater 11 injected into the water injection chamber 22 exceeds a predetermined amount, it overflows from the upper part of the overflow weir 21 and flows into the disinfectant dissolution chamber 23 side. This inflowing rainwater 11 enters the exclusive medicine cylinder 24 and dissolves the water-soluble disinfectant 9. The solution 26 in which the water-soluble disinfectant 9 is dissolved is circulated into the rainwater storage tank 3 through the return pipe 27. Thereby, the rain water 11 in the rain water storage tank 3 is sterilized and disinfected.

  By the way, when the water-soluble disinfectant 9 and the bottom 8a of the dissolver 8 are in contact with each other, water remains at the interface and a thick solution 26 is formed. By raising the water-soluble disinfectant 9 from the bottom 8a by the draining bar 25, only a certain amount of the water-soluble disinfectant 9 can be dissolved by the rainwater 11 at a constant water level injected into the dissolver 8.

  The height of the drainage crosspiece 25 is adjusted according to the required amount of dissolution. However, if the height of the drainage crosspiece 25 is too low, the drainage is not substantially performed. It is necessary to secure 8 mm or more.

  In this embodiment, the rainwater sterilization system collects and stores the rain that has fallen on the surface of the roof 10 of the building through the eaves 12, 2, etc., and adheres to the roof 10, the eaves 12, 2. Since a small amount of the sterilized mixture is sterilized, the high-concentration solution 26 is not necessary. On the contrary, when a chlorine disinfectant is used, if the chlorine concentration becomes high, problems such as generation of odor and trihalomethane occur, which is not preferable.

  Throughout the year, an average chlorine concentration of 0.1 ppm or more, which is equivalent to that of clean water, is ensured, and even if the concentration of the solution 26 becomes high, the solution 26 so that the chlorine concentration limit of the pool is 1.0 ppm or less. Density is set.

  For example, the low concentration solution 26 is repeatedly injected into the rainwater storage tank 3 in conjunction with what is regularly used a certain number of times, such as using rainwater 11 for cleaning the toilet. The lysate 26 can gradually lead to a sterilized state from the control of the number of mixed bacteria.

  In order to stably produce the low concentration state, a chlorine-based disinfectant having a low solubility in rainwater 11 is preferable, and a trichloroisocyanuric acid-based one is particularly preferable because of its low solubility.

  Next, the average chlorine concentration and the maximum chlorine concentration in the rainwater storage tank 3 were simulated by changing the storage volume of the dissolver 8 and the amount of rainwater injected into the disinfectant dissolution chamber 23 in various ways.

  Moreover, the following data was used as conditions for the simulation of the bactericidal effect of the solution 26.

[conditions]
Here, the usage example of the parts concerning the piping system of said stored rainwater sterilization system is demonstrated.

  The main pipe 4 is φ16, and the branch pipe 6 is φ13. As the water injection pipe 20 for injecting water into the dissolver 8, one having a diameter of 26 was used.

The bottom area of the dissolver 8 was 175 cm ² , the height of the overflow weir 21 in the water injection chamber 22 was 20 mm, the height of the drainage bar 25 was 8 mm, and the return pipe 27 of the dissolver 8 was φ22.

Rainwater catchment area (roof 10 area): 100 m ²
Water collection efficiency: 90%
Reservoir volume: Set as follows Minimum secured water volume: 1000L (To cope with no rainy season, it is assumed that the water will be supplemented if it is less than this).
Water chlorine concentration: 0.1ppm
Toilet consumption: 10L / times x 20 times / day = 200L / day Temperature rainfall data: 1984 Tokyo (minimum rainy year from 1964 to 2004)
Reservoir temperature: Same as daily average temperature.
Input disinfectant concentration: Set as follows.
Expressed as the amount of water-soluble disinfectant 9 dissolved at 20 ° C.
The amount of dissolution is adjusted by the open time of the solenoid valve 7 in the dissolver 8.
In the dissolver 8, it was dissolved up to 200 times every 100 minutes at an interval of 1 minute, and the average value was taken as the dissolution amount.
For example, when 30 mg / day is dissolved, the opening time of the solenoid valve 7 is 2 seconds.

  Based on the above data, the daily stored chlorine concentration in the rainwater storage tank 3 was calculated every day, and the average concentration of the daily chlorine concentration for one year and the chlorine concentration when the chlorine concentration became the highest were simulated. . The result of this simulation is shown in FIG.

  As shown in the simulation result of FIG. 2, even if the storage capacity (storage volume) in the rainwater storage tank 3 is changed to 3000 to 10,000 L by using the stored rainwater sterilization system according to the present invention, It was confirmed that a chlorine concentration with an average chlorine concentration of 0.1 ppm was obtained, and that even when the chlorine concentration was highest, the chlorine concentration could be controlled within a range not exceeding the allowable chlorine concentration of the pool of 1.0 ppm.

  The embodiments and examples of the present invention have been described in detail above with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design changes are within the scope of the present invention. Are included in the present invention.

It is a block diagram of the stored rainwater sterilization system concerning the Example of embodiment of this invention. It is the figure which simulated the average chlorine concentration and the highest chlorine concentration in a rainwater storage tank, and put it together in the table | surface.

Explanation of symbols

3 Rainwater storage tank 5 Water-use pump (pump)
5a Pump discharge port 6 Branch pipe 7 Solenoid valve 8 Dissolver 8a Bottom part of disinfectant dissolution chamber (one container chamber) 9 Water-soluble disinfectant 11, 11a Rainwater 19a Water supply port 21 Overflow weir 22 Injection chamber (the other container) Room)
23 Disinfectant dissolution room (one container room)
25 Drainer 26 Dissolution

Claims (5)

A rainwater sterilization system for sterilizing rainwater in the rainwater storage tank, comprising a rainwater storage tank for storing rainwater and a pump for pumping and pouring rainwater from the rainwater storage tank,
Equipped with a dissolver containing a water-soluble disinfectant,
While the pump is being driven, a part of the rainwater pumped by the pump is poured into the dissolver for a certain period of time to dissolve the water-soluble disinfectant,
A stored rainwater sterilization system characterized in that a solution in which the water-soluble disinfectant is dissolved is circulated to the rainwater storage tank. A branch pipe for pouring a part of rainwater discharged from the discharge port of the pump into the dissolver;
2. The stored rainwater sterilization system according to claim 1, further comprising an electromagnetic valve provided in the branch pipe and opened only for a predetermined time while the pump is driven.   The dissolver is divided into two container chambers by an overflow weir, the water-soluble disinfectant is placed in one container chamber, and rainwater is injected into the other container chamber by the branch pipe. The stored rainwater sterilization system according to claim 2, wherein when the amount of rainwater in the chamber reaches a predetermined amount or more, rainwater flows over the overflow weir to one of the container chambers.   The stored rainwater sterilization system according to claim 3, wherein a draining bar is disposed at the bottom of the one container chamber, and the water-soluble disinfectant is placed on the draining bar. The stored water disinfection system according to any one of claims 1 to 3, wherein the water-soluble disinfectant is a trichloroisocyanuric acid tablet.

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