JPH10317434A - Rainwater recycling system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rainwater recycling system which eliminates varous averse effects by recycling only proper rainwater close to neutrality. SOLUTION: The rainwater recycling system is composed of a filter tank 2 for filtering rainwater, water storage tanks 3, 4, 5, in which rainwater filtered by the filter tank 2 is stored, and a pump 6 for feeding rainwater stored in the water storage tanks 3-5. A pH sensor 13 is fitted on its midway to a connecting pipe (a rainwater introducing path) 7 connected to the filter tank 2, and rainwater is bypassed through the filter tank 2 and the water storage tanks 3-5 and removed from the object of recycling when the pH of rainwater detected by the pH sensor 13 is less than a set value (pH6). Accordingly, the pH of rainwater is detected at all times by the pH sensor 13, only proper water close to neutrality adequate to recycling can be recycled effectively because strong acidic (less than pH6) rainwater for the initial stage of precipitation is removed from recycling, and various adverse effects with acidic rain can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rainwater recycling system that detects the pH of rainwater and reuses only appropriate near neutral water.

[0002]

2. Description of the Related Art A rainwater reuse system for recycling rainwater from the viewpoint of effective use of resources has been proposed and has already been put to practical use.

Such a rainwater recycling system includes a filtration tank for filtering rainwater, a storage tank for storing rainwater filtered by the filtration tank, and a rainwater stored in the storage tank for supplying a flush toilet, a garden, or the like. It is a system that includes a pump that sends water, and uses rainwater instead of tap water for flushing toilets, washing cars, or spraying gardens, etc., and is a system that saves tap water, and is achieving desired results.

[0004]

In recent years, however, acid rain often occurs in urban areas due to pollution and the like in recent years, and this acid rain has caused various environmental destructions. In particular, it has been confirmed that the acidity of rainwater at the start of falling is high, and the acidity decreases with time.

However, in the conventional rainwater recycling system, all rainwater is subject to reuse, including rainwater having a high acidity (small pH) which starts to fall irrespective of the acidity of the rainwater. For this reason, there has been a concern about promotion of corrosion of various metals and adverse effects on trees and the like.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a rainwater recycling system that reuses only appropriate rainwater that is close to neutral and eliminates various adverse effects.

[0007] The filtration tank employed in the conventional rainwater recycling system is poor in workability for maintenance including periodic cleaning and the like, and requires a great deal of time and labor for maintenance.

Accordingly, an object of the present invention is to provide a rainwater recycling system capable of performing maintenance of a filtration tank with good workability in a short time.

In addition, the conventional rainwater recycling system has a problem that the system cannot function normally due to a small amount of rainwater in a water storage tank at the time of drought or the like.

Accordingly, an object of the present invention is to provide a rainwater recycling system capable of securing a necessary and sufficient amount of water in a water storage tank and functioning normally even during a drought.

[0011]

In order to achieve the above object, the invention according to claim 1 comprises a filtration tank for filtering rainwater,
A water storage tank for storing rainwater filtered by the filter tank,
In a rainwater recycling system including a pump for feeding rainwater stored in the water tank, a pH sensor is provided in a rainwater introduction path connected to the filtration tank, and a pH sensor is provided.
When the pH of the rainwater detected by the sensor is lower than a set value, the rainwater is bypassed through the filtration tank and the water storage tank, and is excluded from reuse.

According to a second aspect of the present invention, in the first aspect, the set value of the pH is set to 6.

According to a third aspect of the present invention, in the first or second aspect of the invention, rainwater excluded from the object of reuse and water overflowing from the storage tank are made to flow to a sewage pipe. .

According to a fourth aspect of the present invention, in the first aspect of the present invention, the filter tank employs a backwashing filtration method in which rainwater flows upward from below, and a filtering agent is laminated on the filter. It is characterized by comprising.

According to a fifth aspect of the present invention, in the fourth aspect of the invention, a frame is housed in the container of the filtration tank so as to be able to be taken in and out, the filter is set in the frame, and While stacking the bagged filter media,
The sludge receiver is suspended and supported at the lower part of the frame.

According to a sixth aspect of the present invention, in the fifth aspect of the present invention, a seal member is provided over the entire circumference between the container of the filtration tank and the sludge receiver.

The invention according to claim 7 is characterized in that, in the invention according to claim 6, the container is made of FRP, and the seal member is formed integrally with the inner peripheral wall of the container.

According to an eighth aspect of the present invention, in the first aspect of the invention, when the water level in the water storage tank falls below a set value, water is replenished to constantly store water of a predetermined volume or more in the water storage tank. Water supply automatic replenishing means is provided.

According to a ninth aspect of the present invention, in the invention of the eighth aspect, the automatic water supply means includes a water level sensor for detecting a water level in a water storage tank, and a solenoid valve for opening and closing a water supply path. It is characterized by including a control means for controlling the opening and closing of the solenoid valve according to the water level detected by the water level sensor.

According to a tenth aspect of the present invention, in the invention of the ninth aspect, there is provided an abnormal water supply means for supplying water to the water storage tank by bypassing the solenoid valve when an abnormality occurs. Features.

Therefore, according to the first or second aspect of the present invention, the pH of rainwater is constantly detected by the pH sensor, and the highly acidic (less than pH 6) rainwater in the early stage of precipitation is excluded from reuse. Only suitable water near neutrality suitable for reuse can be effectively reused, and various adverse effects associated with acid rain can be eliminated.

According to the third aspect of the present invention, the rainwater excluded from reuse and the water overflowing from the water storage tank are flown into the sewage pipe, so that the sewage pipe is washed with the water and the sewage pipe is clogged. And the like are prevented from occurring.

According to the fourth aspect of the present invention, since the filtration tank employs a backwash filtration method, sludge and the like settle at the bottom of the filtration tank, thereby improving the maintainability including cleaning of the filtration tank. .

According to the fifth aspect of the present invention, since the bagged filter agent is stacked on the frame which is housed in the container of the filtration tank so as to be able to be taken in and out, it is necessary to periodically clean the filtration tank. First, after taking out the bagged filter medium from the container, the frame body is taken out of the container together with the sludge receiver, and after the sludge settled in the sludge receiver is discarded, the frame body and the filter medium are stored in the reverse procedure to the above. By successively storing the filtration tanks, the filtration tank is assembled in a use state, and the maintenance of the filtration tank can be performed in a short time with good workability.

According to the invention of claim 6 or 7, since the space between the container of the filtration tank and the sludge receiver is sealed by the sealing member, the sludge falls between the container and the sludge receiver and accumulates. Can be prevented.

According to the invention as set forth in claim 8 or 9, even when the water is short, etc., it is possible to secure a necessary and sufficient amount of water in the water storage tank by the automatic water supply means. It can function normally.

According to the tenth aspect of the present invention, even when the automatic water supply system does not function due to the occurrence of an abnormality such as a power failure, the water is supplied to the water storage tank by the abnormality water supply means. A necessary and sufficient amount of water can be secured in the water storage tank, and the rainwater recycling system can function.

[0028]

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

FIG. 1 is a side sectional view showing the entire configuration of a rainwater recycling system according to the present invention, and FIG. 2 is a plan view of the same. The rainwater recycling system according to the present invention, as shown in FIG. It comprises a rainwater basin 1, a filtration tank 2 and three water storage tanks 3, 4, and 5 buried therein, and a pump 6 installed on the ground. These rainwater basin 1, filtration tank 2 and water storage tank 3,
4 and 5 are connected by connecting pipes 7, 8, 9 and 10, respectively.

On the other hand, in FIG. 1 and FIG.
This is a water collecting pipe for flowing rainwater collected by a rain gutter (not shown) protected by a mesh made of S or vinyl chloride. The water collecting pipe 11 is connected to the rainwater basin 1.

In the rainwater basin 1, a pH sensor 13 is provided.
Is installed, and a normally closed solenoid valve 14 is installed in the middle of the connection pipe 7. Then, as shown in FIG. 2, from the upstream of the solenoid valve 14 of the connection pipe 7, rainwater that is not suitable for reuse (specifically, highly acidic rainwater at the beginning of precipitation) is supplied to the rainwater basin 1 and the filtration tank 2. A drain pipe 15 for bypassing the water storage tanks 3, 4, 5 is provided.

Incidentally, the pH sensor 13 is a sensor for detecting the pH of rainwater flowing into the rainwater basin 1,
The detection signal is input to the controller 16, and the controller 16 controls the opening and closing of the electromagnetic valve 14 according to the pH of the rainwater detected by the pH sensor 13. Specifically, when the pH of the rainwater detected by the pH sensor 13 is less than 6 (pH <6), the controller 16 turns off the electromagnetic valve 14 and keeps it closed to detect the rainwater. When the pH becomes 6 or more (pH ≧ 6), the electromagnetic valve 14 is turned on to open it.

Next, the configuration of the filtration tank 2 will be described in detail with reference to FIGS. FIG. 3 is a side sectional view of the filtration tank, FIG. 4 is a side sectional view showing a procedure of maintenance of the filtration tank, FIG. 5 is a perspective view of a frame inserted into and removed from the filtration tank, and FIG. FIG. 7 is an exploded perspective view showing the structure of the upper part of the filtration tank.

As shown in FIG. 3, the filtration tank 2 is made of FRP.
A frame 18 is housed so as to be able to be taken in and out of a bottomed cylindrical container 17 integrally formed of (glass fiber reinforced plastic), and a disc-shaped FRP cage 19 and a filter 20 are set in the frame 18. , Gravel 21, charcoal 22, medium sand 23 and fine sand 24,
Are stacked in this order, and a porous disc-shaped fire resisting stone 25 is further placed thereon.

The container 17 has a large diameter straight wall 17c formed above a tapered wall 17b whose diameter increases upward from the bottom plate 17a, and a circular opening 17d is formed on the upper surface thereof. The opening 17d is closed by a disk-shaped lid 26. A connection port 17e is opened below the tapered wall 17b of the container 17, a connection port 17f is opened below the straight wall 17c, and the connection pipe 7 is connected to the lower connection port 17e. The connection pipe 8 is connected to the upper connection port 17f.

A projection 17g is formed integrally on the inner peripheral surface of the tapered wall 17b of the container 17 above the opening 17e over the entire periphery. A valve seat-like flexible seal member 17h is integrally formed over the entire circumference at the lower part.

By the way, as shown in FIG. 5, the frame 18 is composed of two inverted U-shaped bent SUS pipes 2.
Ring members 28 and 29 formed in a ring shape by a SUS pipe are horizontally welded to the upper and lower portions of a total of four support portions 27a of No. 7, and four dish-like sludge receivers 30 are provided below the ring members 28 and 29. Is supported by a SUS chain 31. The upper end of each chain 31 is detachably attached to the ring member 29 by a hook. The upper part of the SUS pipe 27 forms a horizontal grip portion 27b which is parallel to each other (see FIG. 5).

As shown in FIG. 3, the cage 19 is placed on the lower ring member 29 of the frame 18.
The perimeter 19 is supported by the protrusion 17 g formed on the inner wall of the container 17. Then, the filter 20 is placed on the cage 19, and the gravel 2 packed in a bag as described above is placed on the filter 20.
1, charcoal 22, medium sand 23, and fine sand 24 are sequentially stacked in this order from the bottom, and the porous anti-firestone 25 is placed on the ring member 28 on the upper side of the frame 18.

In the state shown in FIG. 3, the seal member integrally formed on the inner peripheral surface of the container 17 is provided on the outer peripheral surface of the sludge receiver 30 suspended by the chain 31 below the frame 18. 17h is in contact.

On the other hand, as shown in FIGS.
Two support members 32, 33 are attached to the inner peripheral wall of the upper straight wall 17c in the piping direction of the connection pipe 8, and the peripheral edges of the opposed openings of the support members 32, 33 Seal members 34 and 3 made of an elastic body
5 is attached.

The longitudinal ends of a channel-shaped gutter 36 having a U-shaped cross section are fitted into the support members 32 and 33 from above, and the gutter 36 has a plurality of butterfly screws at both longitudinal ends. It is detachably attached to both support members 32 and 33 by being screwed by 37. The gutter 36 constitutes an inclined surface whose bottom surface 36a descends toward the connection pipe 8.

Next, the water storage tanks 3, 4, and 5 will be described.

Each of the water storage tanks 3, 4, and 5 is integrally formed in a rectangular box shape by FRP, and their bottom surfaces are inclined downward in the direction of rainwater flow (to the right in FIG. 1). As shown in FIG. 2, the manholes 3a, 4
a, 5a are open, and each manhole 3a,
4a and 5a are closed by disk-shaped lids 38, 39 and 40, respectively. As shown in FIG. 1, the upper portions of the filtration tank 2 and the water storage tank 3 are connected by the connection pipe 8, and the lower parts of the water storage tank 3 and the water storage tank 4 and the lower parts of the water storage tank 4 and the water storage tank 5 are the same as those shown in FIG. They are connected by connecting pipes 9 and 10, respectively.

Here, the configuration of the water storage tank 5 will be described in detail with reference to FIG. FIG. 8 is a side sectional view showing the configuration of the water storage tank 5.

The water storage tank 5 is composed of a container 41 integrally formed by FRP. A concave portion 41a for storing sediment is formed at the bottom of the container 41, and a concave portion on the upper surface of the container 41. The manhole 5a is open at a position corresponding to 41a (see FIG. 2). A connection port 41b is formed at a lower portion of one (upstream) side wall of the container 41, and a connection port 41b is formed at an upper portion of the opposite (downstream) side wall.
c is formed. The connection pipe 10 is connected to one connection port 41b, one end of the overflow pipe 42 shown in FIGS. 1 and 2 is connected to the other connection port 41c, and the other end of the overflow pipe 42 is connected to the other connection port 41c. As shown in FIG. 2, it joins the drain pipe 15. The drain pipe 15 is connected to a sewage pipe (not shown).

The water tank 5 is provided with an automatic water supply device for automatically supplying tap water (tap water).

The above automatic water supply device automatically supplies tap water when the water level of the water storage tank 5 falls below a predetermined value at the time of drought or the like, and constantly stores at least a predetermined amount of water in the water storage tank 5 at all times. It is a device for putting. The water supply automatic replenishment device includes a plurality of electrode rods 43 to 47 having different lengths constituting a water level sensor for detecting a water level in the water storage tank 5 and a supply for supplying tap water to the water storage tank 5. Water pipe 50,
A supply water pipe 51 for refilling the water tank 5 with tap water when an abnormality such as a power failure occurs, a solenoid valve 52 provided on the makeup water pipe 50, and a tap water flowing through the makeup water pipe 50 are supplied to the solenoid valve 5.
A bypass valve 53 that bypasses 2 and flows to a makeup water pipe 51, a manual valve 54 provided in the bypass pipe 53, and a water level in the water storage tank 5 detected by the electrode rods 43 to 47. A controller 55 for controlling the opening and closing of the solenoid valve 52;
2 includes a power supply 56 for supplying electric power for driving the power supply 2 and a control panel 57.

The make-up water pipe 50 has one end connected to a water pipe (not shown) and the other end opened into the water storage tank 5 as shown, and the electromagnetic valve 52 in the middle thereof is connected. Manual valves 58 and 59 and a vacuum breaker 60 are provided at the sandwiched portion.

The make-up water pipe 51 branches off from the make-up water pipe 50 and opens into the water storage tank 5, and a manual valve 61 and a vacuum breaker 62 are provided in the middle thereof. A lever 63 is rotatably connected to an end of the makeup water pipe 51 facing the inside of the water storage tank 5, and a float 64 is attached to an end of the lever 63. The vacuum breakers 60 and 62 are provided to separate rainwater and clean water by a predetermined distance to prevent intrusion of germs and the like contained in the rainwater into clean water.

Further, the bypass pipe 53 branches from the upstream side of the manual valve 58 of the makeup water pipe 50 and joins between the manual valve 61 of the makeup water pipe 51 and the vacuum breaker 62. The manual valve 54 is attached.

On the other hand, a water absorption pipe 65 faces the inside of the water storage tank 5, and a filter 66 is attached to one end of the water absorption pipe 65 facing the water storage tank 5, and the other end of the water absorption pipe 65 stores water. It extends outside the tank 5 and is connected to the suction side of the pump 6 installed on the ground. A discharge pipe 67 extends from the discharge side of the pump 6, and is connected to a place where rainwater is reused, such as a flush toilet or a garden.

Next, the operation of the rainwater recycling system according to the present invention configured as described above will be described.

During rainfall, rainwater collected by a rain gutter (not shown) installed on the roof of the house flows through the water collecting pipe 11 into the rainwater basin 1, and the rainwater is collected by the pH sensor 13.
, The pH value is detected, and the detection signal is transmitted to the controller 16. Then, the controller 16
Converts the detection signal into a digital signal, and keeps the electromagnetic valve 14 closed as described above when the detected rainwater pH value is less than 6 (that is, when the rainwater is strongly acidic).

Then, the rainwater does not flow to the filtration tank 2 side, but directly flows through the drainage pipe 15 to the unshown sewage pipe, and is not used for reuse.

By the way, rainwater in the early stage of precipitation has a strong acidity,
Generally, since the pH value is less than 6, it is not suitable for reuse. Therefore, in the present embodiment, the strongly acidic rainwater in the early stage of precipitation is not reused but flows through the drain pipe 15 to the sewage pipe as it is. ing.

Thus, the pH value of rainwater decreases with time,
The pH value of the rainwater detected by the pH sensor 13 is 6
As described above, when approaching neutrality, the controller 16 opens the solenoid valve 14 as described above. Then, rainwater is introduced from the rainwater basin 1 into the filtration tank 2 through the connection pipe 7.

In the filter tank 2, rainwater is introduced from a connection port 17e which opens in the lower part of the container 17 shown in FIG. 3, and the rainwater is filtered and purified while flowing upward in the container 17. That is, the rainwater passes through the filter 19 and the filter 2
0, gravel 21, charcoal 22, medium sand 23, fine sand 24 and anti-firestone 25 are filtered and purified in the process of passing through, and the purified rainwater is stored in the upper part of the container 17, When it exceeds the height, it overflows and flows down into the inside of the gutter 36, flows along the slope of the bottom surface 36 a of the gutter 36 toward the connection pipe 8, passes through the connection pipe 8, and flows into the water storage tank 3.
Will be introduced.

In the present embodiment, since the filtration tank 2 adopts a backwash filtration method in which rainwater is introduced from below and flows upward, the sludge attached to the filter 20 is transferred to the sludge receiver 30. Fall and settle. At the bottom in the container 17, the gap between the sludge receiver 30 and the container 17 is sealed by the sealing member 17h integrally formed on the container 17 side. Does not fall into the gap between them and accumulate there.

The filter tank 2 is periodically cleaned for maintenance, but the filter tank 2 according to the present embodiment is cleaned.
Since the sludge receiver 30 is accommodated in the lowermost part of the container 17, if water is allowed to flow from above the container 17,
9, filter 20, gravel 21, charcoal 22, medium sand 23,
The deposits on the fine sand 24 and the firestone 25 fall together with the water and are stored in the sludge receiver 30.

When cleaning the filtration tank 2, first, the butterfly screw 37 shown in FIGS.
Are removed from the supporting members 32 and 33 and taken out of the container 17, and then the fire-retardant stone 25 set on the frame 18, the fine sand 24 packed in the bag, the medium sand 23, the charcoal 22, the gravel 21, and the filter 20 Are sequentially taken out of the container.

Next, the horizontal grip 27b (see FIG. 5) above the SUS pipe 27 of the frame 18 is gripped to
8 is lifted together with the sludge receiver 30 and taken out of the container 17 as shown in FIG. 4, the chain 31 is removed from the frame 18 and the sludge accumulated in the sludge receiver 30 is discarded.
After washing the sludge receiver 30 with water, the chain 31 is
The sludge receiver 30 is again hung below the frame 18 by hanging on the frame 8, and the frame 18 is stored in the container 17 together with the sludge receiver 30. In addition, since the container 17 is provided with the tapered wall 17b whose diameter increases upward, the frame 18 can be easily inserted into and removed from the container 17.

After that, the filter 20 is placed on the cage 19 of the frame 18 in the reverse order to the above, and the gravel 21, charcoal 22, medium sand 23 and fine sand 2 packed in a bag are placed thereon.
4 and anti-firestone 25 are sequentially stacked in this order from the bottom, and finally the gutter 36 is attached to the support members 32 and 33.
Is set to the usable state shown in FIG.

As described above, in the present embodiment, the backwash filtration method is adopted for the filtration tank 2, and the frame 18 is housed in the container 17 of the filtration tank 2 so as to be able to be taken in and out. The gravel 21, charcoal 22, medium sand 23, fine sand 24 and anti-fire stone 25 packed in the bag are sequentially stacked in this order from the bottom, and the sludge receiver 30 is hung below the frame 18. Maintenance including cleaning of the tank 2 can be performed in a short time with good workability.

As described above, the rainwater filtered by the filtration tank 2 is introduced into the water storage tank 3 through the connection pipe 8 as described above, and then is transmitted to the water storage tank 4 through the connection pipe 9. Flows through the connecting pipe 10 and further to the water storage tank 5. Since the lower parts of the water storage tanks 3, 4, 5 are communicated with each other by the connecting pipes 9, 10, the filtered rainwater flows into each of the water storage tanks. It is stored while maintaining the same water level at 3, 4, and 5.

In each of the water tanks 3, 4, 5, rainwater is not stored at a water level higher than the height of the overflow pipe 42, and a larger amount of rainwater overflows and flows from the overflow pipe 42 to the water tank. 5 and is discharged from the overflow pipe 42 through the drain pipe 15 to the sewage pipe. Thus, in each reservoir 3,4,5, rainwater can be stored up to the water level h ₀ (see FIG. 8) shown in FIG.

By the way, in the present embodiment, both the strong acidic rainwater having a pH of less than pH 6 and the rainwater overflowing from the water storage tank 5 in the initial stage of the rainfall are made to flow into the sewage pipe. Problems such as clogging of sewage pipes can be prevented. An S trap (not shown) is provided in the middle of the sewage pipe to prevent odor backflow.

When the pump 6 is driven as required, the nearly neutral rainwater stored in the water storage tank 5 is sucked into the pump 6 through the water absorption pipe 65 through the filter 66, and the pump 6 After the pressure is increased to a predetermined pressure, the water is supplied from a discharge pipe 67 to a rainwater reuse place such as a flush toilet or a garden, and is used for water washing to a car wash or a garden, and is effectively used.
This can reduce the amount of tap water used.

By the way, in the rainwater recycling system according to the present invention, even if the water level of the water storage tanks 3, 4, 5 drops due to drought, etc., the water tanks 3, 4, 5 are automatically controlled by the automatic water supply system. 5 is provided with a predetermined amount of water (in this embodiment, a total of 400 liters (the amount used for an average household for two days)) at a minimum.

Here, the operation of the automatic water supply apparatus will be described with reference to FIG.

The electrode rods 43 to 43 constituting the water level sensor
Of the 47, one electrode rod 47 is for grounding, and the other four electrode rods 43 to 46 having different lengths have their water surfaces separated from the lower ends thereof, thereby interrupting electrical conduction. Thus, the water level in the water storage tank 5 is detected.

When the water level of the water storage tank 5 (and the water levels of the other water storage tanks 3 and 4 are the same) due to drought or the like falls below h ₂ shown in FIG. 8, the electrode rod 45 detects this. The signal is transmitted to the controller 55. Then, the controller 55
Opens the solenoid valve 52 to supply tap water from the makeup water pipe 50 to the water storage tank 5. Incidentally, when the water level of the water tank 5 by the use of water in the makeup of the tap water reaches h ₁ further down from h ₂ shown in FIG. 8, this is detected by the electrode rod 46, the controller 55 is low water level alarm Emits.

Then, by supplying tap water from the makeup water pipe 50 to the water storage tank 5, the water level of the water storage tank 5 is increased as shown in FIG.
_{When the} electrode rod 44 detects that the water level has reached ₃ , the controller 55 receives the signal and issues a full water level alarm, and the electrode rod 43 detects that the water level further rises and reaches the illustrated h _4. Then, the controller 55 receives the detection signal and closes the solenoid valve 52. Then, the supply of tap water to the water storage tank 5 is stopped, and each of the water storage tanks 3, 4,
The water level of 5 is maintained at h ₄ , and as described above,
At least a predetermined amount (a total of 400 liters) of water is secured in 4,5.

When the water level in the water storage tank 5 decreases to h ₂ shown in FIG.
5, the solenoid valve 52 is opened, and tap water is resupplied to the water storage tank 5 again from the makeup water pipe 50. Thereafter, the electromagnetic valve 52 is controlled in the same manner as described above, and the water storage tanks 3, 4, 5 are supplied with at least a predetermined amount of water. (400 liters in total) of water.

When the water supply automatic replenishing device does not function due to a power failure or a malfunction of the solenoid valve 52, the manual valve 54 of the bypass pipe 53 is opened, and tap water is supplied from the makeup water pipe 50 to the solenoid valve 52. It is bypassed and supplied to the water storage tank 5 via the bypass pipe 53 and the makeup water pipe 51. Therefore, even when an abnormality occurs, the intended purpose can be achieved by using the rainwater reuse system.

[0075] Then, when the water reservoir 5 gradually increase the water level of the (other water tank 3 and 4 is also the same), reaches h ₀ the water level illustrated in Figure 8, the lever by float 64 to move upward together with the water surface 6
3 rotates, the supply of tap water from the makeup water pipe 51 is stopped, the water levels of the water storage tanks 3, 4, and 5 are maintained at h ₀ , and wasteful discharge of the tap water to the overflow pipe 42 is prevented. Can come off.

As described above, in the rainwater recycling system according to the present invention, the pH of the rainwater is constantly detected by the pH sensor 13, and the highly acidic rainwater having a pH of less than 6 in the early stage of precipitation is to be reused. , It is possible to effectively reuse only suitable neutral water suitable for reuse.

In the present embodiment, the pH of rainwater excluded from the object of reuse is set to less than 6, but it is needless to say that this value can be arbitrarily set each time depending on the usage of rainwater. It is.

[0078]

As is apparent from the above description, claim 1
According to the invention described in 2 or 2, since the pH of rainwater is constantly detected by the pH sensor, and the strongly acidic (less than pH 6) rainwater in the early stage of precipitation is excluded from reuse, neutral water suitable for reuse is provided. Only the appropriate water can be effectively reused, and the effect of removing various adverse effects caused by acid rain can be obtained.

According to the third aspect of the present invention, the rainwater excluded from reuse and the water overflowing from the water storage tank are made to flow into the sewage pipe, so that the sewage pipe is washed with the water, and the sewage pipe is clogged. And the like can be prevented from occurring.

According to the fourth aspect of the present invention, since the filtration tank employs a backwash filtration method, sludge and the like settle at the bottom of the filtration tank, thereby improving the maintenance property including cleaning of the filtration tank. Is obtained.

According to the fifth aspect of the present invention, since the bagged filter agent is stacked on the frame which is housed in the container of the filtration tank so as to be able to be taken in and out, it is necessary to periodically clean the filtration tank. First, after taking out the bagged filter medium from the container, the frame body is taken out of the container together with the sludge receiver, and after the sludge settled in the sludge receiver is discarded, the frame body and the filter medium are stored in the reverse procedure to the above. By successively storing the filtration tanks, the filtration tank is assembled in a use state, and an effect that maintenance of the filtration tank can be performed with good workability in a short time can be obtained.

According to the invention of claim 6 or 7, since the space between the container of the filtration tank and the sludge receiver is sealed by the sealing member, the sludge falls between the container and the sludge receiver and accumulates. Is obtained.

According to the eighth or ninth aspect of the present invention, a necessary and sufficient amount of water can be secured in the water storage tank by the automatic water replenishing means even in the event of a drought, and the rainwater recycling system is constantly operated. The effect that normal function can be obtained is obtained.

According to the tenth aspect of the present invention, even when the automatic water supply system does not function due to the occurrence of an abnormality such as a power failure, the water is supplied to the water storage tank by the abnormality water supply means. An effect is obtained that a sufficient and sufficient amount of water can be secured in the water storage tank, and the rainwater recycling system can function.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an entire configuration of a rainwater reuse system according to the present invention.

FIG. 2 is a plan view showing an overall configuration of a rainwater reuse system according to the present invention.

FIG. 3 is a side sectional view of a filtration tank.

FIG. 4 is a side sectional view showing a procedure for maintenance of the filtration tank.

FIG. 5 is a perspective view of a frame that is taken in and out of a filtration tank.

FIG. 6 is a side sectional view of an upper portion of a filtration tank.

FIG. 7 is an exploded perspective view showing a configuration of an upper portion of a filtration tank.

FIG. 8 is a side sectional view showing a configuration of a water storage tank.

[Explanation of symbols]

 2 Filtration tank 3, 4, 5 Water storage tank 6 Pump 11 Water collecting pipe (rainwater introduction route) 13 pH sensor 14 Solenoid valve 15 Drainage pipe 16 Controller 17 Container 17h Sealing member 18 Frame 20 Filter 21 Gravel (Filter) 22 Charcoal (Filter agent) 23 Medium sand (Filter agent) 24 Fine sand (Filter agent) 25 Anti-fire stone (Filter agent) 30 Sludge receiver 43-47 Electrode rod (Water level sensor) 50, 51 Supply water pipe (Water supply path) 52 Solenoid valve 53 Bypass pipe 55 Controller (control means)

Claims (10)

[Claims] 1. A rainwater recycling system comprising a filtration tank for filtering rainwater, a storage tank for storing the rainwater filtered by the filtration tank, and a pump for feeding the rainwater stored in the storage tank. In the system, a pH sensor is provided in the middle of a rainwater introduction path connected to the filtration tank, and a pH value of the rainwater detected by the pH sensor is provided.
Is smaller than a set value, the rainwater is bypassed through the filtration tank and the water storage tank to exclude the rainwater from reuse. 2. The rainwater recycling system according to claim 1, wherein the set value of the pH is 6. 3. The rainwater reuse system according to claim 1, wherein rainwater excluded from the object of reuse and water overflowing from the storage tank are caused to flow to a sewage pipe. 4. The rainwater according to claim 1, wherein the filtration tank employs a backwashing filtration method in which rainwater flows upward from below, and a filtering agent is laminated on a filter. Reuse system. 5. A frame is accommodated in the container of the filtration tank so as to be able to be taken in and out, the filter is set in the frame, the filter medium packed in a bag is stacked on the filter, and a lower portion of the frame is provided. 5. The rainwater recycling system according to claim 4, wherein a sludge tray is suspended and supported. 6. The rainwater recycling system according to claim 5, wherein a seal member is provided over the entire circumference between the container of the filtration tank and the sludge receiver. 7. The rainwater recycling system according to claim 6, wherein the container is made of FRP, and the seal member is formed integrally with an inner peripheral wall of the container. 8. An automatic water supply means for replenishing clean water when the water level in the water tank falls below a set value and constantly storing water of a predetermined value or more in the water tank. The rainwater reuse system according to claim 1, wherein: 9. The water supply automatic replenishment means includes a water level sensor for detecting a water level in a water storage tank, an electromagnetic valve for opening and closing a water supply path, and the electromagnetic valve according to the water level detected by the water level sensor. 9. The rainwater recycling system according to claim 8, comprising control means for controlling the opening and closing of the rainwater. 10. The rainwater reuse system according to claim 9, further comprising an abnormal water supply means for supplying water to the water storage tank by bypassing the solenoid valve when an abnormality occurs.