JPH09100555A - Initial rain water purification device of rain water utilization system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to always purify a certain amount of initial rain water to store and to enable the automatic purification and storage of initial rain water commensurate with a rainfall when rainfall intervals are short for a purification device of initial rain water in a system using rain water for living non-potalde water service. SOLUTION: An initial rain water purification device is equipped with an initial rain water conduit 16 branched downward from a rain water conduit leading rain water into a water storage tank 1 and opened to a treatment tank 18, a treated water outlet pipe 21 equipped with a flow control device 23 leading rain water in the treatment tank 18 into the water storage tank 1, a neutralization liquid tank 28 storing a specific amount of neutralization liquid, and a float valve for opening a pipe line connecting between the neutralization liquid tank 28 and treatment tank 18 when the water level of the treated tank 18 reaches the specific level. If desirable, a treatment liquid auxiliary tank 32 is prepared, and the treatment liquid auxiliary tank 32 is connected to the neutralization liquid tank 28 with a pipe line 24 provided with the flow control device. Initial rain water required for neutralization treatment is only stored in the treatment tank 18, and it is automatically neutralized with neutralization liquid in the neutralization liquid tank 28.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system in which rainwater is used as water for daily use such as car washing, watering trees, and toilet flushing water. The present invention relates to a device that can be purified and used as water in daily life.

[0002]

2. Description of the Related Art In Japan, since water resources are abundant, tap water (water for tap water) is used as water in daily life such as car washing, watering trees, and toilet flush water. The use of rainwater as water for daily living in
It is preferable not only in terms of economy but also in terms of protection of water resources and reduction of environmental load.

Storage of rainwater for use as domestic water is still practiced in mountainous areas and remote areas, and it is not unusual and does not require such a high level of technology. Since it is indispensable to install an aquarium with a certain amount of capacity, an initial cost is required, which is a bottleneck for widespread use.

On the other hand, due to the widespread use of sewers nationwide, there are many areas where the septic tanks that have been used up to now become unnecessary. In such areas, the septic tanks are cleaned and disinfected before they are used in daily life. If it is used as a water storage tank, there is an advantage that the rainwater utilization system can be realized at a low initial cost.

[0005]

The rain that begins to fall flows down to wash suspended matter in the atmosphere and to wash dust and debris adhering to the roof surface. Although there are differences depending on the region, nitrogen oxides and sulfurous acid gas discharged from vehicles are suspended in the atmosphere, and the initial rainwater that falls to wash them is usually acidic and suspended in the air. Since the organic matter that is produced is also mixed in, it is necessary to remove or purify these initial rainwater even if it is used only as water in daily life. The amount of initial rainwater that needs to be purified varies greatly from region to region, and it is said that in densely populated cities and industrial areas it is necessary to clean up 3 to 5 mm at the beginning of the descent, and the purpose of use is car washing. In the case of relatively rough conditions such as water spraying and sprinkling, if the area has clean air, untreated or 1
It is said that it is sufficient to treat initial rainwater of less than mm.

The simplest method of treating the initial rainwater is to discharge it without using it.
Since rain does not fall only in a lump, the amount of initial rainwater in the total amount of rainfall is relatively large, and if the initial rainwater is not used, the efficiency of using rainwater will deteriorate.

Therefore, according to the present invention, a certain amount of initial rainwater is always purified, and when the rainfall interval is short, an amount of initial rainwater commensurate with that is automatically purified and stored in a water tank together with rainwater that continues to fall. To obtain a device that can be used.

[0008]

The initial rainwater purifying apparatus for a rainwater utilization system according to the first aspect of the present invention is a treatment tank 18
And an initial rainwater introduction pipe 16 that branches downward from the rainwater introduction pipe that guides the rainwater to the water storage tank 1 and opens into the treatment tank 18, and a flow rate limiting means 23 that guides the rainwater in the treatment tank 18 to the water storage tank 1. The treated water outflow pipe 21, the neutralization liquid tank 28 that stores a predetermined amount of the neutralization liquid, and the neutralization liquid tank 28 and the treatment tank 18 when the water level of the rainwater in the treatment tank 18 reaches a predetermined level. And a float valve 25 for opening a pipe line communicating with each other.

According to a second aspect of the present invention, in the initial rainwater purifying apparatus of the rainwater utilization system according to the first aspect, a neutralizing solution reserve tank 32 having a capacity sufficiently larger than that of the neutralizing solution tank 28 is provided. The tank 32 is characterized in that it is connected to the neutralizing liquid tank 28 by a conduit 24 provided with a flow rate limiting means.

[0010]

According to the first aspect of the present invention, only the initial rainwater necessary for the neutralization process flows into the processing tank 18, and a predetermined amount of the neutralization solution stored in the neutralization solution tank 28 enters the processing tank 18. Only the amount of initial rainwater that flows in automatically and needs to be neutralized is automatically neutralized.

According to the second aspect of the present invention, a predetermined amount of the neutralizing solution is stored again in the neutralizing solution tank 28 when a predetermined time elapses after the neutralizing solution tank 28 and the processing tank 18 are emptied. In addition, the detected water level of the float 27 for opening and closing the float valve of the neutralizing solution tank and the neutralizing solution tank 2 to the neutralizing solution tank 2
By the balance with the flow rate of the neutralizing liquid that gradually flows to 8,
It is possible to automatically perform the optimum neutralization process without excess or deficiency of the neutralization liquid without using human hands or electric control.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 4 is a diagram showing an example of a rainwater utilization system using a diversion septic tank 1 as a water storage tank. The diversion septic tank 1 is separated from the sewage inflow pipe (the separated sewage pipe is connected to the sewer), and then washed and sterilized to install the pump pump 2, and the discharge pipe of this pump is used for the sprinkler 3 and car wash. The rainwater collected in the rain gutter 6 is connected to the wash water pipes of the outdoor faucet 4 and toilet 5,
A rainwater introduction pipe 8 is provided so as to flow into the diversion septic tank 1 through the filter and the initial rainwater treatment device 7.

Water falling on the roof 9 is collected by the rain gutter 6,
It is stored in the water tank 1 through the rainwater introduction pipe 8. When the water in the water storage tank 1 is used for car washing or the like, the water pump 2 is driven to pump the water in the water storage tank 1 to the discharge pipe 12 of the water pump.

1 to 3 show an initial rainwater purifying apparatus according to the present invention. At the lower end of the rain gutter 6 is provided a coarse dust removing section 14 provided with a wire mesh filter 13 for removing coarse dust such as leaves. The upper surface of the coarse dust removing portion 14 is open, and the wire mesh filter 13 is obliquely arranged so that the opening 15 is on the upstream side. The rainwater that has passed through the coarse dust removing section 14 is guided to the diversion septic tank 1 through the rainwater introduction pipe 8, and an initial rainwater introduction pipe 16 that branches in a T shape and extends downward is connected in the middle of the conduit. There is. At the entrance of the initial rainwater introduction pipe 16 which branches off from the horizontal portion of the rainwater introduction pipe 8, a plate 17 is provided to give the water flowing through the rainwater introduction pipe 8 a little rectifying action.

The lower end of the initial rainwater introduction pipe 16 has a treatment tank 18
It is open to. The treatment tank 18 is a container sealed by a lid 19, and a thin treated water outflow pipe 21 connected to the water storage tank 1 is connected to the bottom portion. Treatment tank 18 and treated water outflow pipe 2
A small-diameter orifice 23 is provided in the connection portion with 1,
The amount of water flowing out of the treatment tank 18 is limited.

The initial rainwater introduction pipe 16 is arranged on one side of the treatment tank 18 in a biased manner (see FIG. 3), and the treated water outflow pipe 21 is located on the opposite side. And the processing tank 18
A filter 22 is provided between the side on which the initial rainwater introduction pipe is arranged and the side on which the treated water outflow pipe 21 is arranged. In this filter 22, the initial rainwater is introduced into the treatment tank. When flowing from the pipe 16 side to the treated water outflow pipe 21 side, fine dust contained in the initial rainwater is filtered. Therefore, the above-mentioned orifice 23 is not clogged, and the float valve 25 described later does not leak.

A neutralizing liquid introducing pipe 24 is inserted into the treated water outflow pipe 21 side of the filter 22. The neutralization liquid introduction pipe has a neutralization liquid tank 28 at the upper portion, and a float valve 25 is provided at the lower end thereof. A rod 26 extending downward is connected to the valve body of the float valve 25, and a float 27 is fixed to the lower end of the rod 26. The volume of the neutralizing solution tank 28 is a size corresponding to the volume of the processing tank 18, and when the initial rainwater is fully stored in the processing tank 18, the neutralizing solution necessary for neutralizing it is just stored. To do. An air pipe 31 having a height exceeding the horizontal portion 29 of the rainwater introduction pipe is erected on the side of the treatment tank 18 on which the initial rainwater introduction pipe 16 is arranged. The air pipe communicates the treatment tank 18 with the atmosphere. There is. The upper end of the air tube 31 is bent in an inverted U shape so that dust and the like do not enter.

A neutralizing solution reserve tank 32 having a large capacity is connected to the upper end of the neutralizing solution tank 28, and the neutralizing solution reserve tank 32 stores the neutralizing solution therein. Neutralizing solution reserve tank and neutralizing solution tank 28
A small-diameter orifice is provided in the pipe connecting the and, so that the neutralizing solution in the neutralizing solution preliminary tank 28 gradually flows into the neutralizing solution tank 28.

Next, the operation of the initial rainwater treatment system of the illustrated embodiment will be described. In the state after the sunny weather continues, the inside of the processing tank 18 is empty, and the neutralizing solution tank 28 stores the neutralizing solution flowing from the neutralizing solution preliminary tank 32. When it starts to rain in this state, the rainwater collected by the rain gutter 6 flows into the rainwater introduction pipe 8 through the coarse dust removing section 14. The initial rainwater that first flows through the rainwater introduction pipe 8 flows downward at the branch portion of the initial rainwater introduction pipe 16 and is guided to the treatment tank 18. Since the orifice 33 provided at the connection port of the treated water outflow pipe 21 has a very small diameter, it takes time for the water in the treated tank 18 to flow from the treated tank 18 to the septic tank 1.
Therefore, the initial rainwater collects in the treatment tank 18. Processing tank 18
When the rainwater inside reaches a certain water level, the float 27 is pushed up and the float valve 25 of the neutralizing solution tank is opened. Therefore, the neutralization liquid in the neutralization liquid tank 28 flows into the processing tank 18, and the acidic initial rainwater in the processing tank 18 is neutralized.

The water level at which the float valve 25 is opened is set based on the statistics of how rain falls in the area. That is, when the rain that does not reach the level of the float 27 repeatedly falls after a certain time, unneutralized rainwater flows into the diversion septic tank (water storage tank) 1. When the rain continues, the float valve 25 is opened to supply the neutralizing solution necessary for neutralizing the initial rainwater to the treatment tank 18, and then the neutralizing solution preliminary tank moves to the neutralizing solution tank 28. Since the neutralizing liquid that flows out little by little flows into the processing tank 18 as it is, an extra neutralizing liquid will flow in. Therefore, in consideration of both of them, the level of the float 27 is set so that the total amount of the neutralizing liquid corresponds to the amount of the initial rainwater.

The neutralizing solution in the neutralizing solution tank 28 is used as the processing tank 18.
If it continues to rain after flowing into the tank, the treatment tank 18 will be filled with rainwater, and the water level will reach the level of the branch port of the initial rainwater introduction pipe 16. Then, the rainwater flowing through the rainwater introducing pipe 8 will no longer flow into the initial rainwater introducing pipe 16 side, but will flow over the perforated plate 17 and directly flow into the diversion septic tank 1. Therefore, if the volume of the treatment tank 18 is set to a size obtained by multiplying the rainfall amount (mm) of the initial rainwater that requires treatment by the catchment area (m ² ), only the initial rainwater that requires treatment will flow into the treatment tank 18. Rainwater that is neutralized by
Instead of flowing into the processing tank 18, it directly flows into the diversion septic tank 1.

When the rain continues for a long time, the septic tank 18 is filled with rainwater during that time, and the float valve 25 remains open, so that the neutralizing solution preliminary tank 32 gradually flows into the neutralizing solution tank 28. The sum solution flows into the treatment tank 18 as it is, and an amount of rainwater commensurate with the rainwater flowing out of the treated water outflow pipe 21 gradually flows into the treatment tank 18, so that an extra amount of rainwater is supplied during that time. It will be neutralized. The amount of this extra neutralization and the amount of rainwater that flows into the diversion septic tank 1 from the treatment tank 18 through the treated water outflow pipe 21 without being neutralized when rain falls below the water level of the float 27. In consideration of the above, the position of the float 27 described above is determined.

When the rain rises, the rainwater flowing into the treatment tank 18 disappears, and the rainwater in the treatment tank 18 gradually flows out to the diversion septic tank 1 through the treated water outflow pipe 21. Therefore, when the water level in the treatment tank 18 is lowered and becomes equal to or lower than the water level in the float 27, the float valve 25 is closed, and the neutralizing solution flowing out from the neutralizing solution preliminary tank 32 thereafter is stored in the neutralizing solution tank. Becomes Then, after a certain period of time elapses after the rain has risen, the processing tank 18 is emptied and a predetermined amount of the neutralizing solution is accumulated in the neutralizing solution tank 28.

The neutralizing solution tank 2 from the orifice 23 and the neutralizing solution preliminary tank 32 provided at the connecting portion between the treated water outflow pipe 21 and the filtering tank.
The diameter of the orifice 33 provided in the conduit of the neutralizing liquid flowing to 8 is determined in consideration of the time until the normal concentration of nitrogen oxide or sulfur dioxide gas starts to float again in the air after the rain has risen. In other words, the time from when the rain has risen until the concentration of nitrogen oxides or sulfurous acid gas in the atmosphere reaches the normal concentration, the treatment tank becomes empty after the rain has risen, and the neutralization liquid tank 28 has a predetermined amount. The time until the neutralization liquid is stored should be about the same.

[0025]

According to the present invention described above, only the initial rainwater is neutralized and filtered with a very simple structure and without providing an electrical control device, and the rainfall condition in the installation area or nitrogen in the atmosphere is reduced. Depending on the concentration of oxides and sulfur dioxide,
It is possible to obtain an initial rainwater purification device that can appropriately neutralize the required amount of initial rainwater and also filter dust contained in the initial rainwater, and to use the initial rainwater safely and efficiently. There is an effect that it is possible to install a rainwater utilization system at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional side view of an initial rainwater treatment device.

FIG. 2 is a plan view of an initial rainwater treatment device.

FIG. 3 is a sectional front view of an initial rainwater treatment device.

[Fig. 4] Schematic diagram of rainwater utilization system

[Explanation of symbols]

 16 Initial rainwater introduction pipe 18 Treatment tank 21 Treated water outflow pipe 24 Neutralization liquid introduction pipe 25 Float valve 28 Neutralization liquid tank 29 Horizontal part 32 Neutralization liquid preliminary tank

Claims (2)

[Claims] 1. A treatment tank (18), an initial rainwater introduction pipe (16) that branches downward from a rainwater introduction pipe that guides rainwater to the water storage tank (1) and opens into the treatment tank (18), and a treatment tank ( 18) Rainwater in the water tank (1)
A treated water outflow pipe (21) equipped with a flow rate limiting means (23) for leading to
Neutralization liquid tank (28) that stores a predetermined amount of neutralization liquid, and treatment tank (18)
When the water level inside the rainwater reaches a specified level, the neutralization liquid tank
An initial rainwater purification device for a rainwater utilization system, comprising a float valve (25) that opens a pipe line that communicates between (28) and the treatment tank (18). 2. A neutralizing solution preliminary tank (32) having a sufficiently larger volume than the neutralizing solution tank (28), and the neutralizing solution preliminary tank (32) is a pipe line (24) provided with a flow rate limiting means. The initial rainwater purification device of the rainwater utilization system according to claim 1, wherein the device is connected to the neutralization liquid tank (28).