JP3333758B2 - Rainwater filtration and storage system - Google Patents

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 various contaminants contained in rainwater by simple filtration to obtain clear water, and to remove and clean deposits inside a filtration device. The present invention relates to an almost maintenance-free rainwater filtration and storage system requiring no operation.

[0002]

2. Description of the Related Art Water is an indispensable resource for living things on the earth, and in particular, is indispensable to our daily lives. Water circulates through various routes, including the atmosphere surrounding the earth, and we use part of it in our daily life. We use water mainly in the form of river surface water or groundwater. The water resources available on the earth are only a small part of the whole water, and the demand for it will continue to increase in the future, and it is becoming increasingly difficult to obtain water resources available at hand.

On the other hand, rain falling in the mountains is used as water vapor, groundwater, or river water, but rain falling in urban areas is hardly used as resources. . Recently, the use of rainwater has been increasing somewhat, albeit gradually, with the voice of lack of water resources. To get the water, he builds a huge dam far upstream and draws water from the dam. However, the cost of dam construction, the destruction of the environment associated with the dam construction, the cost of transporting water from the dam, the construction of water treatment plants for water treatment, the operating costs, and the distribution network for distributing the water. Spends enormous costs, labor and environmental changes that we cannot imagine.

[0004] In order to ensure abundant and stable supply of important drinking water, the above-mentioned costs are unavoidable facility investment, but the water used in our daily life is both quantitative and quantitative. But not all must be drinking water. In particular, water such as toilet water, washing water, sprinkling water, and other miscellaneous water, which occupy most of the household water, should not miss the familiar water resources, that is, rainwater.

[0005] And on the earth where we live,
Water, air, and green all support the living of living creatures in a unified way, so if you are thinking only of rainwater use (equipment costs, beneficiaries, etc.), use of rainwater is And it is a breakthrough to solve the air and green things.

[0006]

The above-mentioned use of rainwater has many effects as shown in the following (1) to (6). (1) Use of own water resources within the natural water circulation system to protect the global environment, (2) Suppress urban floods,
(3) Drought countermeasure effect, (4) Heat island mitigation effect, (5) Urban disaster prevention effect, emergency water source effect, (6)
Hydrophilic, environmental protection effect.

[0007] However, the quality of rainwater,
There are also problems such as dust in the atmosphere, pollutants and various oxides from automobile exhaust gas, as well as dioxin and various other environmental hormones, which are sufficient for use as it is and for groundwater recharge by infiltrating underground. If care is not taken, it can lead to the pollution of precious existing resources. Rainwater should be considered for filtration according to the purpose of use or use after treatment, and at least simple filtration should be performed.

[0008] The above-mentioned conventional filtration apparatus is of a downward flow type, in which infiltrate contained in the incoming raw water accumulates on the upper part of the filter tank, sometimes causes clogging, and sometimes the filter tank is backwashed. Must be removed. For this reason, conventional filtration devices are:
Since there are many difficulties in maintenance and the flexibility of selecting the capacity of the device is poor, there is a problem that it is often found that the capacity does not match the catchment area or the storage scale.

The present invention has been made in view of the above circumstances, and automatically drains initial rainwater and automatically performs backwashing operation, thereby facilitating maintenance and management of filtration capacity. Moreover, it is an object of the present invention to provide a rainwater filtration and storage system which has simplified maintenance.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a rainwater filtration and storage system according to the present invention comprises a means for collecting rainwater, and the rainwater collected by the means is made to flow using a head. Rainwater storage means for storing, and this rainwater storage means
Rainwater filtration, which is arranged at a lower value and supplies rainwater stored by the rainwater storage means in an upward flow direction from a lower part to an upper part through a rainwater supply path, and filters rainwater through a filtration layer during the supply. means, and a water storage means for water and filtered filtered water in the rainwater filtration means, rainfall initial pollutant
In order to eliminate, from the rainwater storage means to rainwater filtration means
Two valves were installed in the supply path to supply rainwater,
Rainwater collected and stored is controlled by two valves,
Drained not let supplied, also, internal deposition by filtration
Of the two valves, on the rainwater supply side,
Close the valve and open the drain side valve to reverse the rainwater filtration means.
It is characterized by washing and washing .

[0011]

[0012]

In order to facilitate replacement and addition of the filter medium according to the quality of the filtered water and to simplify maintenance, cleaning, etc., the rainwater filtration means stores the filter medium in a detachable mesh bag, It is characterized in that a plurality of bags are laminated.

A plurality of the rainwater filtering means are provided according to the scale of the amount of treated water.

As described above, in the present invention, an upward flow system is adopted for the filtration flow direction in consideration of the above matters, and the control of the valve is automatically controlled, so that no manual operation is required for drainage, washing, and filtration. System. In addition, the initial drainage for eliminating pollutants in the early stage of rainfall is reliably operated automatically to increase the effective recovery rate of rainwater.Furthermore, according to the present invention, the material used is made as low as possible by using a general standard material, The filtering means itself is unitized, the number of combinations is changed according to the amount of filtered water, and the selection of a capacity that matches the facility scale can be facilitated.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing a system configuration according to a first embodiment of the present invention.
The rainwater flowing into the rain gutter 2 flows down from the drain 3 of the rain gutter 2 to the standing gutter 4. Although not shown, a large dust screen is provided at the portion of the drain 3. A pipe 5 buried underground is connected to the lower part of the upright gutter 4. The pipe 5 is led to a drain 7 via a valve 6 on the way. The pipe 5 is branched before the valve 6, and is connected to the start-up pipe 9 via the valve 8. This pipe 9 is connected to a relatively upper part of a water collecting pipe 10 having a height of about 1.5 m. An overflow pipe 11 is connected to a further upper portion of the water collecting pipe 10, and this pipe 11 is also led to the drain groove 7.

A lower portion of the water collecting pipe 10 is connected to a pipe 13 for guiding a rainwater filtering section 12 shown in detail in FIG. Piping 13
Is provided in the middle of the process. On the outlet side of the valve 14,
One end of the T-shaped branch pipe 15 is connected, and the other end is guided to the drain groove 7 via a valve 16 and a pipe 17. The T-shaped end of the branch pipe 15 is connected to the bottom of a filtration tank 18 composed of a cylindrical body constituting the rainwater filtration unit 12. Filtration tank 1
8, various filter media are stacked and stored, and the filter tank 1
Rain water flowing from the lower part of the filter 8 is filtered in the filter tank 18 to obtain filtered water at the upper part. The filtered water obtained in the upper part of the filtration tank 18 is led to a water storage tank 20 via a pipe 19. Water in the water storage tank 20 is pumped up by a water supply pump 21. The water storage tank 20 is configured so that tap water is supplied from the water supply via a pipe 22 so that water can be supplied from the water supply when rainfall is low. 23
Is a valve, and 24 is a support for supporting the filtration tank 18. Each of the above-described valves is a motor-operated valve, and these motor-operated valves are controlled by a control circuit (not shown).

As shown in FIG. 2, the filter tank 18 has a filter layer inside. The filter layer is placed in a net bag and sequentially laminated in consideration of future maintenance. Consideration is given so that replacement can be easily performed. Mesh bags can be used from fine to coarse, depending on what is stored, such as filters, sand, pebbles, and granular activated carbon, and filter media can be selected and equipped according to the required water quality. It is configured as follows.

As shown in FIG. 3 (a), the mesh bag 25 is made of stainless steel and has grip portions 25a and 25b formed so that it can be easily taken in and out of the filtration tank 18, and the grip portions 25a and 25b are formed. Fig. 3 is a diagram illustrating a case where the filter medium, such as sand, pebbles and gravel, is stored in the bag portion 25c and then folded.
As shown in (b) and (c), it is configured in a disk shape. FIG.
In (c), the pebbles are stored in the net bag 25,
Although a part of the nets of a and 25b are cut out, in the case of fine objects such as sand, the holding parts 25a and 25b are left as nets.

Next, the operation of the embodiment constructed as described above will be described. It is assumed that the filtration tank 18 is filled with water in advance. 1 and 2, when there is rainfall, rainwater collected by the rain gutter 2 is first collected from an inlet 10a of the water collecting pipe 10, and the water level inside the water collecting pipe 10 rises. (At this time, the valves 14 and 16 are both closed.) When the water level in the water collecting pipe 10 rises to near the overflow, it is detected by the liquid level relay 61F provided inside the water collecting pipe 10. As a result, the drainage electric valve 16 is opened, and the sediment that has stagnated in the lower part of the filtration tank 18 and the contaminants that have adhered to the lower part of the filtration layer are drained through the pipe 17 from the drain outlet outside the tank together with the drainage. It is discharged to 7.
At the same time, the water accumulated up to the upper part of the filtration tank 18 is also drained vigorously, so that the backwash effect of the filtration layer is exerted.

Next, after a predetermined time period, the valve 14 is continuously opened, and the sediment accumulated on the water collecting pipe 10 is also drained at once. Further, the initial drainage for draining the inflowing rainwater containing much of the pollutants and contaminants in the early stage of rainfall on the inflow side of the water collecting pipe 10 from the pipe 17 to the drain 7 without entering the filtration tank 18. I do. Of course, depending on the area where the equipment is installed, according to a number of experimental data in a very heavy traffic area in Tokyo, it will be 1.0- Ideally, 1.5 mm of rainfall should be initially drained.

The water collecting pipe 10 of this embodiment also has a kind of a measuring box function. When installing the device, the drainage frequency is determined according to the rainfall receiving area and the condition of the installation area. Is set at the counter, so that a predetermined initial rainfall can be reliably removed regardless of the intensity of rainfall, and the rainfall can be effectively captured.

After the above operation has been performed a predetermined number of times, only the drainage motorized valve 16 is fully closed, and the rainwater enters the filtration tank 18 and starts to be filtered as an upward flow. From the outlet, the water is led to a water storage tank 20 through a pipe 19. The repetition cycle of the initial drainage system can be freely set between 2 hours and 168 hours by a timer.

FIG. 4 is a structural explanatory view showing a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted. In FIG. 4, the length of the water collecting pipe 10 is reduced and attached to the wall of the house 1 or the like, and
A rain gutter 4 is connected to the rainwater inlet 10a of the
The pipe 5 leading to the rainwater filtration unit 12 is connected to the rainwater outlet 10b at the bottom of the slab. In this way, by configuring the water collecting pipe 10, the water collecting pipe 10 can be easily configured.

FIGS. 5 (a) and 5 (b) are a front view and a plan view of a rainwater filtering section showing a third embodiment of the present invention. In the third embodiment, two filtration tanks 18 of the rainwater filtering section 12 are provided. FIG. 6 shows a configuration in which the filtration tank 18 is configured as four tanks.

As in the third embodiment, the filtering tanks 18 may be connected in series or in parallel in accordance with the scale of water collection to form a unit so that the filtering capacity can be increased or decreased.

As described above, the water collecting pipe 10 and the rainwater filtering section 1
2 and the flow of the rainwater raw water at the time of filtration was an upward flow system, so that heavy substances of impurities removed by filtration settled at the lower part of the filtration tank 18 and most of the substances were deposited at the lower part of the filtration layer. Deposited on Therefore, since the initial water discharge is performed by fully opening the valve 16 at the start of the initial operation (the valve 14 is fully closed), the lower sediment is removed together with the drainage water, and the water stored up to the uppermost part in the filtration tank 18 is removed. As a result, the filter medium in the filtration tank 18 becomes drainage which also serves as a backwash operation, and the accumulated impurities are removed.
Miscellaneous goods will be eliminated.

Subsequently, after a predetermined time period, when the valve 14 is also fully opened, the sediment in the water collecting pipe 10 and the like is removed together with the drainage of the water in the pipe. That is, every time this device is operated as described above, the backwashing and draining operations are performed automatically, which is effective in the maintenance and management of the device, and can reduce power consumption in maintenance operation, and requires almost manual labor. And no maintenance benefits are obtained. In this case, the above operations are sequentially performed individually in order to enhance the backwashing effect.

During the drainage operation (when both the valves 16 and 14 are fully opened), the rainwater containing a large amount of pollutants at the beginning of rainfall is drained directly to the drainage ditch 7 without being sent to the filtration tank 18. It is effective for maintaining water quality. In addition, during drain operation, valve 1
By using the water collecting pipe 10 in a measuring box by repeating the opening and closing operation of the predetermined number of times 4, it is possible to reduce the initial rainwater drainage and aim for more effective use of rainwater.

The filter medium is always in the water, so that the microorganisms growing on the surface of the filter medium exhibit the purifying power of the rainwater passing therethrough, and it is possible to obtain clearer filtered water than the inflow water.

[0031]

As described above, according to the present invention,
The following effects can be obtained. (1) In the present invention, the initial drainage of the rainwater filtration section is automatically performed.
The backwashing operation is performed, and the maintenance of the filtration capacity is facilitated, and the effect of labor saving is great. (2) The maintenance of the device is easy, and the maintenance of the device is also simple. Most maintenance is unnecessary and maintenance-free. (3) The rainwater filtration unit is a standard unit so that expandability can be freely exhibited according to the scale, and a combination of series and parallel can be made according to the amount of treated water. Therefore, equipment costs are also reduced. (4) Filter media can be easily replaced or combination of filter media materials can be easily changed according to the required quality of filtered water.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a system configuration showing a first embodiment of the present invention.

FIG. 2 is a detailed configuration diagram of a rainwater filtration unit.

FIG. 3 shows a net bag for storing filtered sand or the like.
(B) is a front view, (c) is a plan view.

FIG. 4 is a configuration explanatory view showing a second embodiment of the present invention.

FIG. 5 shows a third embodiment of the present invention,
(A) is a front view, (b) a plan view.

FIG. 6 is a plan view showing another example of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... House 2 ... Rain gutter 3 ... Drain 4 ... Standing gutter 5, 9, 11, 17, 19, 22 ... Piping 7 ... Drainage groove 10 ... Water collecting pipe 12 ... Rainwater filtration part 6, 8, 14, 16, 23 ... Valve 18: Filtration tank 20: Water tank 21: Water supply pump

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) E03B 3/03 B01D 24/48 B01D 29/60 B01D 36/00

Claims (3)

(57) [Claims] 1. Means for collecting rainwater , storing rainwater collected by this means using a head, and measuring
And rainwater storage means to function as, the rainwater storage means
Rainwater that is disposed at a lower position and supplies rainwater stored by the rainwater storage means in an upward flow direction from a lower part to an upper part through a rainwater supply path, and the rainwater is filtered by a filtration layer during the supply. Means and rainwater filtering means from the rainwater storing means.
And two valves provided in the supply channel for supplying rainwater to
Rainwater collected and stored in the early stage of rainfall by controlling two valves
A means for draining the water without supplying it to the rainwater filtration means;
Of the two valves, close the valve on the rainwater supply side and close the valve on the drainage side.
Means for controlling opening and backwashing the rainwater filtration means,
Rainwater filtration water storage system characterized by comprising a water storage means for water and filtered water filtered by the rainwater filtration means. 2. The rainwater filtering means is provided in a detachable mesh bag.
The filter material is stored in the
The rainwater filtration and storage system according to claim 1, wherein 3. The method according to claim 1, wherein a plurality of said rainwater filtering means are provided.
The rainwater filtration and storage system according to claim 1 or 2, wherein: