JP2000096633A - Rainwater storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent propagation of algae and various germs by precipitating and separating the foreign matters contained in the initial-stage rainwater in an upper storage tank, guiding the overflow water into a filtering/sterilizing unit, and storing it in a lower storage tank after an antibacterial process. SOLUTION: The inside of a storage tank 1 is vertically partitioned into two to form an upper storage tank 2 and a lower storage tank 6, a downspout 7 is set to communicate with an eaves gutter is provided in the upper storage tank 2 through a cover body 11 from above the cover body 11. The water overflowing from an overflow tube 20 in the upper storage tank 2 is guided into the inner bag of a filtering/sterilizing unit 5, it is filtered into contact with an antibacterial agent 52, and it is sterilized into clean water. The water is stored into the lower storage tank 6 through the hole 54 of an outer tube 50, and a faucet is provided to utilize the water for washing a car or for sprinkling to garden trees and flower beds. The initial-stage rainwater is efficiently stored. The rainwater removed with foreign matters is guided into the filtering/ sterilizing unit 5, the clogging of the filtration membrane of the unit 5 is suppressed, and its life can be prolonged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing water, such as dust and sand, mixed in sediment by sedimentation / filtration and sterilizing the water when guiding the water, such as rainwater, to a storage tank. And a rainwater storage device capable of preventing the propagation of algae and various germs.

[0002]

2. Description of the Related Art In recent years, rainwater collected by an eaves gutter of a building is guided to a storage tank and stored therein, and this rainwater is used as water for flushing a toilet or washing a car, or watering garden trees and flower beds. Alternatively, they are used as water for emergencies.

[0003]

However, the rainwater collected by the eaves gutter, especially the initial rainwater that has begun to fall, contains foreign matter such as dust and sand that has accumulated on the roof, so that rainwater cannot be collected. In some cases, it could not be used without filtration. Also, when rainwater is stored in a storage tank for a long period of time and used as water for an emergency, there is a safety and health problem that algae and various germs propagate due to organic matter mixed in the rainwater. there were.

As means for separating initial rainwater, which has a particularly large amount of contaminants, conventionally, there is a method using floatation and sinking of a float, and a method of flowing water in a downspout due to a difference in precipitation (low water amount at the beginning of falling). Although there are some that utilize the difference, all of them can discard a certain amount of rainwater corresponding to about several mm at the beginning of rainfall, and can only collect a large amount of rainfall of several tens mm or more. However, statistically, rainfall of about several millimeters per time is the most, and as a result, it is almost discarded, and storage efficiency is deteriorated.

The present invention has been made to solve the above-mentioned problem, and can introduce foreign substances such as dust and sand when conducting service water such as rainwater into a storage tank and filter the same. An object of the present invention is to provide a rainwater storage device that can prevent the growth of algae and various germs for a long period of time by leading to the rainwater storage device.

[0006]

The above object is achieved by the following means.

That is, according to the present invention, the inside of the storage tank is
Separated into layers, sand and sand contained in the initial rainwater in the upper storage tank
A rainwater storage device that proposes to settle and separate contaminants such as dust and dirt, to guide overflowed water into a filtration / sterilization unit, to perform filtration / antibacterial treatment, and to store in a lower storage tank 2. It is.

According to the present invention, not only can the propagation of algae and various bacteria be prevented for a long period of time, but also impurities such as sand, dust, and dust contained in the initial rainwater are settled and separated, and the overflowed water is filtered.・ Because it is guided into the sterilization unit, there is no need to store and discard the initial rainwater in the upper storage tank, and the storage efficiency is good, and the rainwater from which some impurities have been removed is guided into the filtration / sterilization unit. Therefore, there is an effect that the filter membrane of the unit is less likely to be clogged and the life is prolonged.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rainwater storage device according to the present invention will be described in more detail with reference to the drawings. FIG. 1 is a side sectional view showing an example of the present invention, and FIG. 2 is a partially cutaway perspective view showing an example of the present invention. FIG. 1 and FIG.
The interior of the storage tank 1 is divided into upper and lower layers as shown in FIG. 1, and impurities such as sand, dust, and dust contained in the initial rainwater 3 are settled and separated in the upper storage tank 2, and the overflowed water is filtered and sterilized. This is a rainwater storage device characterized in that the rainwater storage device is guided to the inside, filtered and subjected to antibacterial treatment, and stored in the lower storage tank 2.

The storage tank 1 according to the present invention is a container-shaped main body 1.
0 and lid 11, the inside of the storage tank is divided into upper and lower layers, and has an upper storage tank 2 and a lower storage tank 6, and communicates with an eave gutter (not shown) from above the lid 11. A downspout 7 is provided in the upper storage tank 2 through the lid 11, and rainwater from a roof (not shown) can be introduced into the upper storage tank 2 through the downspout 7 connected to the eaves gutter. .

In the upper storage tank 2, among the foreign substances 4 such as sand, dust, and dust in the initial rainwater 3, those having relatively large particles having a particle diameter of, for example, 30 μm or more are settled and separated.

In the upper storage tank 2, an overflow cylinder 20 is formed so as to rise from the inner bottom surface thereof. When the rainwater exceeds the overflow water level H, the overflow cylinder 20 flows into the overflow cylinder 20. The filtration / sterilization unit 5 can be mounted in the overflow cylinder 20, and the outer flange portion 51 provided with the outer cylinder 50 of the filtration / sterilization unit 5 at the opening edge is engaged with the upper edge of the overflow cylinder 20 in a watertight manner. Then, the filtration / sterilization unit 5 is mounted so as to be suspended.

The outer tube filtration / sterilization unit 5 comprises a granular antibacterial material 52 in the outer tube 50 and an inner bag 53 fitted on the upper portion of the outer tube 50. And the inner bag 53 is made of sand.
Dust and dirt can be filtered, and the bottom of the inner bag 53 and the outer cylinder 5
A gap 55 is formed with the bottom of the zero, and the gap 55 is filled with the antibacterial material 52.

The size of the hole 8 is preferably in the range of 0.1 to 3.0 mm, and may be set smaller than the size of the antibacterial material 52 so as not to pass through.

The size of the antibacterial material 52 is 0.2 to 10
A cylindrical shape having a diameter of 4 mm and a length of 4 to 5 mm is preferable.

Examples of the type of the antibacterial material 52 include a material in which silver salt or copper salt is mixed into a carrier such as zeolite or plastic to release silver ions or copper ions into the working water.

The material of the inner bag 53 may be cloth, paper, or a sintered porous body of plastic, etc., depending on the degree of contamination of the overflowed rainwater. Can be used.

The diameter of the mesh is preferably 10 to 50 μm.

The water overflowing the overflow cylinder 20 in the upper storage tank 2 is introduced into the inner bag 53 of the filtration / sterilization unit 5, filtered, and brought into contact with the antibacterial material 52 to be sterilized into clean water. It is stored in the lower storage tank 6 through the hole 54 of the outer cylinder 50.

The water stored in the lower storage tank 6 can be used for washing the car, spraying garden trees and flower beds by providing a faucet 61 as shown in FIG.

Although not shown, an overflow port may be provided in the lower storage tank 6 to regulate the maximum water level.

The upper storage tank 2 has a roof with an average area of 30 tsubo and a building area ratio of 80% (only one side of the roof, having a roof projected flat area of 40 m), in order to settle and separate impurities 4 of the initial rainwater. ^The volume is preferably about 40 liters in order to receive all the initial rainwater of about 1 mm of rainfall collected in ² ). The height of the overflow cylinder 20 in the upper storage tank 2 defines an overflow water level.
The height may be set so as not to flow into the filtration / sterilization unit 5 before settling. For example, in order to settle and separate 80% or more of the contaminants 4 having a particle size of 30 μm or more, the height is preferably 15 cm or more. That is, impurities such as sand, dust, and dust having a size of 30 μm or more are expressed by Stokes equation V = (g / 18) · {(ρ _S −ρ _F ) / μ} · d ² V: sedimentation velocity, g: gravitational acceleration, d : Particle size, ρ _S , ρ
_F : the sedimentation velocity V is 9.08 × 10 ^−2, assuming that the density of solid and liquid follows μ: ν · ρ (ν: kinematic viscosity of water, ρ: density of water).
Since the cm-sec ^-1, its removal rate E by the upper reservoir 2 height (the filtering and inflowing height to overflow port to the sterilizing unit) and 15cm E = {1-1 / ( 1 + T / t)｝ × 100 (%)

[0023]

(Equation 1) t: Sedimentation time (in the case of a height of 15 cm, the sedimentation velocity V obtained from the Stokes equation V = 9.08 × 10 ⁻⁴ cm · sec)
2.75 minutes from ^-1 ) E = approximately 80%.

In addition, the water stored in the upper storage tank can be used for applications in which there is no problem even with dirty water such as watering garden trees.

[0025]

According to the present invention, it is possible not only to prevent the growth of algae and various germs for a long period of time but also to settle and separate impurities such as sand, dust, and dust contained in the initial rainwater, and to overflow water. Since the initial rainwater is stored in the upper storage tank and need not be discarded, the storage efficiency is good, and the rainwater from which contaminants have been removed to some extent is filtered and passed through the filtration / sterilization unit. Therefore, there is an effect that the filter membrane of the unit hardly causes clogging and the life is prolonged.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an example of the present invention.

FIG. 2 is a partially cutaway perspective view showing an example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rainwater storage tank 10 Main body 11 Lid 2 Upper storage tank 3 Initial rainwater 4 Impurities 5 Filtration / sterilization unit 6 Lower storage tank 61 Faucet 7 Downspout

Claims (1)

[Claims] 1. The inside of a storage tank is divided into upper and lower layers, and impurities such as sand, dust, and dust contained in initial rainwater are settled and separated in an upper storage tank, and overflowed water is filtered into a filtration / sterilization unit. A rainwater storage device, which is guided, filtered, and subjected to antibacterial treatment and stored in a lower storage tank.