JPH1193246A - Underground permeating and purifying storage method of rainwater and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To purify and store a part of rainwater in the ground, and use fallen rainwater for living water by storing water in a purified water storage tank after purifying rainwater, and permeating it in the ground by introducing it to a rainwater underground permeating drainage ditch by the water overflowing action when the storage tank is full. SOLUTION: Received rainwater is stored in a purified water storage tank 6 as living water by performing purifying treatment. In this case, when the purified water storage tank 6 becomes full, and when a rainwater introduced to a tank body 3 becomes full by a heavy rain, it is introduced to a rainwater underground permeating drainage ditch 1 by the water overflowing action, and rainwater permeates in the ground. That is, the rainwater underground permeating drainage ditch 1 is buried around a facility for a rainwater purifying storage construction method, and a storage cross section is made large, and it is temporarily stored at heavy rain time. Even if water injection into a purifying storage facility becomes excessive, it is relased to the rainwater underground permeating drainage ditch 1, and the rainwater permeates in the ground in a long time. Therefore, it is reused as living water, and a service water-saving purpose is attained, on the one hand, rainwater penetrated in the ground is held as the underground water, and ground subsidence can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to underground infiltration and purification of rainwater in which rainwater is infiltrated underground, and part of the rainwater is purified and stored to be used as domestic water. The present invention relates to a storage method and a storage device.

[0002]

2. Description of the Related Art The outflow rate of rainwater in a development area such as residential land development is about 30% to 40% before the development, but rises significantly to 80% to 90% after the development. Therefore, after the development, there is a problem that rainwater flows out of the ground surface due to rainfall, which causes flood damage. This is because the ground surface is covered by the installation of roads, construction of buildings, and the like during development, and the infiltration of rainwater into the ground is hindered.

As a first means for solving such a problem, there is a means for repairing or newly constructing a waterway in a development area. However, in this method, if there is a successive development activity in the same drainage system basin, it is impossible to repair the drainage channel again, so that the development does not catch up with the tempo and is immediately stuck.

[0004] As a second means, there is a means of excavating a regulating pond for storing rainwater. However, the new construction not only hinders the use of land, but also in several years. If mud is generated and the treatment and management of the mud is neglected, problems such as the overgrowth of weeds and the occurrence of pests occur. Some of the costs required for such management are ridiculous and cannot be called reasonable means.

[0005] From the above problems, as a third means,
A method of infiltrating rainwater underground in the development area was approved on August 2, 1983 as a measure against rainwater treatment. This rainwater infiltration method has the advantage that there is no hindrance to land use because the facility is installed underground.
In addition, there is an advantage that, by feeding groundwater, land subsidence is prevented, and the groundwater feeds trees and contributes to environmental improvement. The construction cost is relatively low, and it is easy to manage.

[0006]

The rainwater infiltration method described above, however, focuses solely on the fact that rainwater infiltrates the ground exclusively and does not allow rainwater to flow to the ground surface. It is a thing. However, rainwater is also a resource, and it is all this that permeates the ground.
In terms of effective use of resources, this method is still irrational.

The present invention is intended to solve such a problem, and is characterized in that part of rainwater is purified and stored in the ground, and the rainwater can be used as domestic water. Things.

[0008]

According to the present invention, after purifying rainwater taken into a rainwater introduction tank, the rainwater is stored in a purified water storage tank to be used as domestic water. When the purified water storage tank is full, or when the tank for rainwater introduction is full due to heavy rain, etc., the overflow action leads to the drainage for rainwater underground penetration, where the penetration of rainwater into the ground is attempted. The method is also characterized in that, when surplus water is generated, it is prevented that the surplus water is drained to a sewer by a surplus water drainage pipe and liquid is discharged to the surface. The present invention has solved the above-mentioned problem based on the adoption of such a configuration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the drawings, reference numeral 1 denotes a drainage ditch for rainwater underground penetration having a required size, which is buried underground. The drain groove 1 has a bottom and four peripheral walls formed by a perforated plate 1a, so that rainwater collected inside can be permeated into the ground through the perforated plate 1a. The permeation holes a formed in the perforated plate 1a are configured to be tapered holes that expand in the outer surface direction, so that clogging with earth and sand is prevented. Reference numeral 1b denotes a surplus water drainage pipe provided at a required position from the upper edge of the drainage ditch 1 for releasing rainwater into the drainage ditch 1 to a river or a sewer.

At the time of burying the above-mentioned drainage channel for rainwater infiltration underground, by forming a crushed stone layer 2 on the outer periphery thereof,
It is designed to improve rainwater penetration. When the crushed stone layer 2 and the surrounding earth and sand are in direct contact with each other, clogging is likely to occur in the crushed stone layer 2. It is composed. Further, in order to prevent earth and sand from entering the crushed stone layer 2 from the topsoil layer, a water-impermeable material 2b is provided on an upper portion of the crushed stone layer 2.

The crushed stone layer 2 formed as described above
It becomes a layer having a storage space for permeated water, functions as a storage layer for maintaining the permeation time of rainwater for a long time, and at the same time prevents clogging of the perforated plate 1a.

Reference numeral 3 denotes a rainwater introduction tank installed inside the above-mentioned rainwater underground seepage drainage ditch 1, and rainwater is introduced through a water pipe 4 such as a rain gutter.
Reference numeral 3a denotes an overflow groove formed by cutting off the upper edge of the tank body 3 so that when the amount of introduced rainwater exceeds a certain amount, it overflows and flows into the drainage groove 1 for rainwater underground penetration. It is configured in. Reference numeral 5 denotes a basket body removably housed in the tank unit 3 for scooping out dirt or dirt or the like that has entered along with rainwater, and discarding it.

Reference numeral 6 denotes a purified water storage tank, which is installed in the above-mentioned drainage channel 1 for infiltration of rainwater underground. And the said purified water storage tank 6 with respect to the above-mentioned rainwater introduction tank body 3
It is connected through a catalytic oxidation tank 7 in which a series of purification water passages is formed. In other words, in principle, the rainwater introduced into the rainwater introduction tank 3 is guided to the purified water storage tank 6 through the catalytic oxidation tank, and when the rainwater introduction tank 3 becomes full, The overflow water is allowed to escape to the rainwater underground seepage drain 1 side.

The above-mentioned catalytic oxidation tank 7 is for performing a purification treatment based on a catalytic oxidation method. The contact oxidation method involves immersing a filter medium in water, generating a biofilm on the surface or in a gap between the filter media, and contacting the biofilm with the sewage to purify biological sewage. It is. Further, since a biofilm on a filter medium immersed in water is used, forced supply of oxygen to sewage is required. The purification treatment based on such a catalytic oxidation method belongs to a known technique.

The contact oxidation tank 7 shown in the drawing has a plurality of tanks (four tanks in the illustrated embodiment) connected to each of the purification tanks, and each of the separation tanks has a shelf-like free-flowing fluid contact. With respect to the leaky bed 7a, a filter material 7b for reticulated contact oxidation is inserted into a required floor so as to be freely inserted and removed. The principle of purification by catalytic oxidation lies in the contact speed between rainwater and filter media. In other words, the most appropriate speed is at a flow rate of about 5 cm for 1 second, and if the flow rate is too high,
Dirt does not adhere to the filter medium.

Reference numeral 8 denotes a pumping pipe provided in the purified water storage tank 6 for removing purified water via a pump or the like. Reference numeral 9 denotes a ladder-shaped foot-bar for an operator to enter for cleaning the purified water storage tank 6 or the like.

The tank 3 for introducing rainwater through the water pipe 4
Rainwater taken into the inside of the catalyst oxidation tank
It is made to flow into the catalytic oxidation tank 7 more. The rainwater is subjected to a purification process in a process of sequentially circulating through the respective chambers in the catalytic oxidation tank 7. After water purification, it is made to flow into the purified water storage tank 6 and stored as domestic water.
The purification in the catalytic oxidation tank 7 is performed by the reticulated contact oxidation filter medium 7.
b.

The present invention has the following effects. When excessive rainwater is supplied into the rainwater introducing tank body 3, excess water overflows from the overflow groove 3a formed by cutting off the upper edge of the tank body 3, and the rainwater flows into the underground seepage drainage groove 1. It is led to. Then, the water is permeated and discharged into the ground from the perforated plate 1a which is the four peripheral wall surfaces of the drain groove 1.

That is, according to the present invention, the taken-in rainwater is subjected to a purification treatment and then stored as domestic water in the purified water storage tank 6, and when the purified water storage tank 6 is full, When the rainwater introduction tank body 3 is full based on the above, the overflowing action guides the rainwater into the rainwater underground seepage drainage ditch 1 and allows the rainwater to penetrate underground.

In other words, underground rainwater infiltration is performed by installing a drainage channel for rainwater underground infiltration 1 around the facility for rainwater purification and storage, and having a large storage cross section so that water can be injected into the purification and storage facility during heavy rain. Even if it overflows, it can escape into the rainwater underground seepage drain 1 and temporarily store it, so that it can take time to infiltrate underground.

[0021]

According to the present invention, water resources can be effectively used based on purification and storage of rainwater. At the same time, the surplus rainwater will penetrate underground. Therefore, stored purified water can be reused as domestic water (washing other than drinking or water for toilets)
The purpose of saving tap water is achieved. On the other hand, rainwater that has infiltrated into the ground prevents ground subsidence by feeding groundwater, and contributes to environmental improvement by feeding trees by groundwater.

Furthermore, the present invention is configured so that the function of purifying rainwater and the function of infiltrating rainwater into the ground are integrated as one facility, so that the installation space can be minimized,
Construction costs will be reduced, operation and management will be easier, and economy will be improved.

That is, according to the present invention, the catalytic oxidation tank 7
And the purified water storage tank 6 can be taken up and down, so that the site for the equipment is reduced by half.
Further, since the catalytic oxidation tank 7, which is a catalytic oxidation device, is formed into a three-dimensional structure in a few steps, it requires only one tenth of the land used for a planar device, so that the management is easy. Furthermore, since the rainwater infiltration ditch can also be installed surrounding the purification and storage facility (the purified water storage tank 6 and the catalytic oxidation tank 7), the land can be saved.
As described above, the integration of treatment and purification and storage by rainwater infiltration into the ground enables the installation of facilities in narrow individual houses, and, according to this, the purpose of infiltration and purification and storage of rainwater in individual houses. Can be fulfilled.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing the entire present invention.

FIG. 2 is a plan view showing the whole of the present invention.

FIG. 3 is a rear view of a perforated plate 1a for forming a side wall of the drainage groove for rainwater underground seepage.

FIG. 4 is a front view of a perforated plate 1a for forming the side wall of the drainage groove 1 for rainwater underground seepage.

FIG. 5 is a sectional view taken along line XX in FIG. 4;

FIG. 6 is an enlarged sectional view of a portion of a perforation hole a in the perforated plate 1a.

FIG. 7 is a tank body for rainwater introduction in a state in which a basket body is taken away.
FIG.

FIG. 8 is a side view showing the rainwater introducing tank body 3 in a state where the basket body 5 is taken out.

FIG. 9 is a longitudinal sectional view showing the rainwater introducing tank body 3 in a state where the basket body 5 is taken out.

FIG. 10 is a longitudinal sectional view showing a catalytic oxidation tank 7.

FIG. 11 is a longitudinal sectional view showing a fluidized contact leak bed 7a to be charged in the first and third stages in the catalytic oxidation tank 7.

FIG. 12 is a vertical sectional view showing a fluidized contact leak bed 7a to be accommodated in the second and fourth stages in the catalytic oxidation tank 7.

FIG. 13 is a side view showing a reticulated contact oxidation filter medium 7b to be taken into the fluidized contact leakage bed 7a.

[Explanation of symbols]

 Reference Signs List 1 drainage groove for rainwater underground infiltration 1a perforated plate a hole for infiltration 1b surplus water drainage pipe 2 crushed stone layer 2a water-permeable sheet 2b impervious material 3 rainwater introduction tank 3a overflow groove 3b catalytic oxidation tank groove 4 5 Basket 6 Purified water storage tank 7 Catalytic oxidation tank 7a Leakage bed for fluid contact 7b Filter material for mesh contact oxidation 8 Pumping pipe 9 Ladder-shaped foot stick

Claims (7)

[Claims] 1. A method for purifying rainwater taken into a rainwater introduction tank body and then storing the rainwater in a purified water storage tank for use as domestic water, so that the purified water storage tank is full. Or, when the tank for rainwater introduction is full due to heavy rain, etc., the overflowing action guides the rainwater to the drainage ditch for underground infiltration, where rainwater is infiltrated into the ground. Rainwater infiltration and purification storage method. 2. The method of infiltrating and purifying rainwater underground according to claim 1, wherein the purification process of the rainwater is performed based on a contact oxidation method. 3. A rainwater underground seepage drain (1) having a bottomed bottom and four peripheral walls formed of a perforated plate (1a) is buried in the ground, and a water guide pipe (4) is inserted into the drain (1). ), A rainwater introduction tank (3) for introducing rainwater is provided, and the rainwater introduction tank (3) receives the rainwater flowing into the catalytic oxidation layer and exceeds a certain amount. When it overflows, it is configured to overflow into the drainage drainage for rainwater underground penetration (1), and the rainwater introduction tank body (3) further comprises a series of purification water passages for performing a purification treatment for rainwater. Through which the purified rainwater stored in the purified storage tank (6) is used as domestic water. Permeation and purification storage equipment. 4. A crushed stone layer (2) for preventing clogging of a perforated plate (1a) and providing a storage space is formed on an outer peripheral portion of the drainage groove for rainwater underground infiltration (1). Around the perimeter 2), a water permeable sheet (2a) is attached to prevent clogging of the crushed stone layer (2) and maintain the permeation ability, and furthermore, prevents infiltration of the crushed stone layer (2) from the topsoil layer from the soil layer. Impervious material for
The underground infiltration and purification storage device for rainwater according to claim 3, wherein (2b) is installed above the crushed stone layer (2). 5. The method according to claim 3, wherein the means for purifying the rainwater is a catalytic oxidation tank configured to purify the water based on a catalytic oxidation method. Rainwater underground permeation and purification storage device. 6. As a contact oxidation tank (7), a purifying chamber partitioned into a plurality of tanks is communicated with each other, and is inserted into a shelve-shaped free-flowing fluid leakage floor (7a) provided in each purifying chamber. The underground infiltration and purification storage of rainwater according to claim 5, wherein the filter material (7b) for reticulated contact oxidation is inserted into a required floor so as to be freely inserted and removed. 7. The underground infiltration and purification storage of rainwater according to claim 5, wherein the contact speed between the rainwater and the filter medium is maintained at about 5 cm / sec.