JP2005146600A - Stored rainwater treatment device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize the quantity treated at a final treating site of sewerage by preventing the deterioration in water quality of stored rainwater drained from a rainwater storage facility. <P>SOLUTION: A drain end part of a rainwater storage tank 11 is provided with a drain port 24 for draining a supernatant water layer 14a, and a drain port 25 for draining a polluted water layer 14c. A water passage 31 communicating with the drain port 24 of supernatant water is provided almost horizontally along the internal wall of the rainwater storage tank 11. A supernatant water storage chamber 26 for temporarily storing the supernatant water layer 14a is provided facing the outlet side of the drain port 24 of supernatant water, and a polluted water storage chamber 27 for temporarily storing the polluted water layer 14c is provided facing the outlet side of the drain port 25 of polluted water. The supernatant water in the supernatant water storage chamber 26 and the polluted water in the polluted water storage chamber 27 are separately drained by pumps 16. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a rainwater storage facility for preventing inundation damage that occurs in lowlands during rainy weather, and treatment of stored rainwater for efficiently draining wastewater from this rainwater storage facility into supernatant water and contaminated water It relates to the device.

Recently, urban areas have expanded and rainwater infiltration areas have decreased, and in urban areas where buildings are densely populated, rainwater that has rained flows into the lowlands without seeping into the ground, and inundation damage has occurred in the lowlands. Yes. In order to prevent inundation damage in this lowland, as shown in FIG. 9A, a rainwater storage tank 11 such as a rainwater storage pipe or a rainwater storage tank is buried under the ground 10 such as a park or a road, Water is collected and stored via a rainwater inflow pipe 13 from a rainwater collecting channel 22 connected to the manhole 12 or the like.
The rainwater stored in the rainwater storage facility is drained to the public waterway 18 by the pump 16 in fine weather after the rain stops, and the inside of the rainwater storage tank 11 is always emptied for rainwater storage at the next rainfall. Keep it.

The quality of the stored rainwater varies depending on the installation location of the rainwater storage facility, but is generally contaminated with dirt, sand, fallen leaves, etc. on the surface of the road.
Even if the stored rainwater is drained, the pollutant 21 adheres and accumulates on the wall surface, bottom, and tube bottom of the rainwater storage tank 11 of the rainwater storage facility, and odor is generated. And the pollution density of stored rainwater is made high by repeating this several times.

When the pollutant concentration is low, the stored rainwater is pumped up to the public waterway 18 by the pump 16 and discharged into public water areas such as rivers and seas.
However, when the concentration of stored rainwater is high, as shown in FIG. 9A, the rainwater storage tank 11 is stationary for a certain period of time, and the supernatant water layer 14a opens only the on-off valve 20a, and the supernatant water pump 16a Suction and discharge into public waterway 18. When the pollution level of the intermediate water layer 14b is low, only the on-off valve 20b is opened, and is sucked by the intermediate water pump 16b and discharged into the public water channel 18. When the intermediate water layer 14b is highly polluted, only the on-off valve 20c is opened, and is sucked by the intermediate water pump 16b and discharged to the sewer pipe 19. The polluted water layer 14 c opens only the on-off valve 20 d, and is sucked by the polluted water pump 16 c and discharged to the sewer pipe 19. The polluted water layer 14c discharged to the sewer pipe 19 is processed at a sewer final treatment plant (not shown) and discharged to a public water area.

In FIG. 9 (a), if the supernatant water pump 16a is forcibly sucked, even if only the supernatant water layer 14a is to be sucked, as shown in FIG. 9 (b), the water flow increases as the distance from the upper drainage port 15a increases. A water flow is also generated in the intermediate water layer 14b and the polluted water layer 14c like the water flow 17e and the water flow 17e, and the polluted water layer 14c is mixed with the supernatant water layer 14a and discharged from the upper drainage port 15a. Therefore, rainwater with poor water quality mixed with the polluted water layer 14 c is discharged into the public waterway 18.
The problem to be solved is to prevent deterioration of the quality of the stored rainwater pumped from the rainwater storage facility directly to the public waterway 18.

If the flow rate discharged to the public waterway 18 is reduced for the purpose of improving the water quality, the amount of water discharged to the sewer pipe 19 increases accordingly, and the amount to be treated at the end treatment plant of the sewer increases, resulting in an increase in processing costs.
The problem to be solved is to reduce as much as possible the amount to be treated at the final treatment plant of the sewer.

By simply draining the stored rainwater 14 stored in the rainwater storage tank 11 with the pump 16, the pollutant 21 adheres to or accumulates in the rainwater storage tank 11, and the pollution concentration of the stored rainwater 14 gradually increases.
The problem to be solved is to make it possible to wash the polluted matter 21 adhering to the rainwater storage tank 11 or depositing it with a device as simple as possible.

  The present invention relates to a stored rainwater treatment apparatus in which stored rainwater 14 stored in a rainwater storage tank 11 is separated into an upper supernatant water layer 14 a and a lower polluted water layer 14 c and drained by a pump 16. The drainage end of the rainwater storage tank 11 is provided with a drainage port 24 for draining the supernatant water layer 14a and a drainage port 25 for polluted water draining the polluted water layer 14c, and draining the supernatant water. A flowing water channel 31 communicating with the opening 24 is provided substantially horizontally along the inner wall of the rainwater storage tank 11, facing the outlet side of the drainage port 24 of the supernatant water, and temporarily storing the upper supernatant water layer 14 a. A supernatant water storage chamber 26 is provided, a polluted water storage chamber 27 is provided to temporarily store the lower polluted water layer 14c facing the outlet side of the polluted water drain 25, and the supernatant water is stored. The supernatant in chamber 26 A processing device storing rainwater, characterized in that the aqueous layer 14a and a polluted water layer 14c of the inner storage chamber 27 of the polluted water are distinguished respectively as draining with pump 16.

In addition, a water flow suppression plate 33 is provided inside the rainwater storage tank 11 to prevent the lower polluted water layer 14c from being rolled up by the water flow generated when the upper supernatant water layer 14a is drained.
The water flow channel 31 communicating with the drainage port 24 of the supernatant water has a bowl shape with an upper opening, and the water flow channel 31 is attached with a gap between the inner walls on both sides of the rainwater storage tank 11. On the side wall on the inner wall side of the rainwater storage tank 11, a notch 32 for flowing down is formed to overflow the wash water.

  According to the first aspect of the present invention, the drainage end of the rainwater storage tank 11 is provided with the drainage port 24 for draining the supernatant water layer 14a and the drainage port 25 for polluted water draining the polluted water layer 14c. A drainage channel 31 communicating with the supernatant water drainage port 24 is provided substantially horizontally along the inner wall of the rainwater storage tank 11, facing the outlet side of the supernatant water drainage port 24, and temporarily passing the upper supernatant water layer 14 a. A clear water storage chamber 26 is provided, a polluted water storage chamber 27 is provided to temporarily store the lower polluted water layer 14c facing the outlet side of the polluted water drain 25, and the supernatant water is provided. Since the supernatant water layer 14a in the storage chamber 26 and the polluted water layer 14c in the polluted water storage chamber 27 are distinguished and drained by the pump 16, the separated supernatant water is supplied to the supernatant water storage chamber 26. Temporarily store and pollute contaminated water Are temporarily stored in the storage chamber 27, and separated into the supernatant water storage chamber 26 and the polluted water storage chamber 27, thereby preventing them from mixing with each other and improving the quality of the drained water. Can do.

  According to invention of Claim 2, the water flow suppression board 33 which prevents that the lower polluted water layer 14c rolls up by the water flow which generate | occur | produces at the time of drainage of the upper supernatant water layer 14a in the inside of the rainwater storage tank 11 is provided. Therefore, the supernatant water layer 14a can be discharged into the public water channel 18 as much as possible so that the contaminated water layer 14c is not mixed with the supernatant water layer 14a, and the cost of sewage treatment can be reduced.

  According to the third aspect of the present invention, the flowing water channel 31 communicating with the drainage port 24 of the supernatant water has a bowl shape with an upper portion opened, and the flowing water channel 31 is interposed between the inner walls on both sides of the rainwater storage tank 11. Since the notch 32 for flowing down overflowing the washing water is formed on the inner wall side wall of the rainwater storage tank 11 of the flowing water channel 31, the flowing water channel 31 has a drainage of the supernatant water. It can be used for supplying cleaning water, and it is possible to prevent the rainwater storage tank 11 from being contaminated with the pollutant 21 with a simple device.

  According to the invention described in claim 4, the flowing water channel 31 communicating with the drainage port 24 of the supernatant water has a bowl-like shape with an open top, and the flowing water channel 31 extends along the inner walls on both sides of the rainwater storage tank 11. A wash water pipe 37 is attached with a gap between the inner walls on both sides of the rainwater storage tank 11 along the water flow path 31 and the wash water pipe 37 is pumped by the pump 16 toward the inner wall side. Since the injection hole 38 for injecting the water 36 is formed, the cleaning water 36 is injected onto the inner wall of the rainwater storage tank 11 and can be cleaned more effectively.

  According to the fifth aspect of the present invention, the supernatant water drain opening / closing valve 30a and the washing water supply are supplied to the supernatant water discharge pipe 40a for draining the supernatant water layer 14a in the supernatant water storage chamber 26. Since the on-off valve 30b is connected and the cleaning water 36 is supplied to the water flow channel 31 or the cleaning water pipe 37 through the on-off valve 30b for supplying the cleaning water, only the on-off valve 30b for supplying the cleaning water is added. The washing water can be washed by the supernatant water pump 16a using the supernatant water without supplying washing water from others.

  According to the invention described in claim 6, the flowing water channel 31 communicating with the drainage port 24 of the supernatant water has a bowl-like shape with an open top, and the flowing water channel 31 is formed along the inner walls on both sides of the rainwater storage tank 11. A water flow control plate that is attached to these two water channels 31 and is inclined toward the bottom of the rainwater storage tank 11 and prevents the lower polluted water layer 14c from being rolled up by the water flow generated when the upper supernatant water layer 14a is drained. Since 33 is provided, the pollutant 21 in the rainwater flowing into the rainwater storage tank 11 can surely fall to the bottom and prevent the pollutant 21 and polluted water from rolling up after the fall.

  According to the seventh aspect of the present invention, the flowing water channel 31 communicating with the drainage port 24 of the supernatant water has a bowl shape with an upper part opened, and the flowing water channel 31 is formed along the inner walls on both sides of the rainwater storage tank 11. Attached to these flow channels 31 is a substantially vertical plate opening at the top and bottom of the rainwater storage tank 11, and the lower polluted water layer 14c is rolled up by the water flow generated during drainage of the upper supernatant water layer 14a. Since a plurality of water flow restraining plates 33 for preventing water are provided at predetermined intervals, it is possible to prevent the pollutant 21 and the polluted water from rolling up after sedimentation, and the pollutant 21 in the rainwater is substantially vertical. Adhering to the suppression plate 33 can be reduced as much as possible.

  According to the eighth aspect of the present invention, the discharge chamber 41 is provided adjacent to the supernatant water storage chamber 26 and the polluted water storage chamber 27, and the upper portion of the partition wall between the supernatant water storage chamber 26 and the discharge chamber 41 is provided. A gate 39a and a lower gate 39b are provided, a polluted water gate 39c is provided in a partition wall between the polluted water storage chamber 27 and the discharge chamber 41, and the opening and closing of the upper gate 39a, the lower gate 39b and the polluted water gate 39c is controlled. Since the stored rainwater 14 led to the discharge chamber 41 is drained by one pump 16, the drainage of the supernatant water, the drainage of the polluted water, and the washing water by opening and closing one pump and three gates. Can be controlled.

  According to the ninth aspect of the present invention, the supernatant water storage chamber 26 includes the wash water storage portion 26a having a deep bottom and the supernatant water storage portion 26b shallower than the wash water storage portion 26a. The supernatant water suction pipe 42a, the polluted water suction pipe 42b, and the washing water suction pipe 42c are branched into three directions, and the top of the supernatant water suction pipe 42a is connected to the supernatant water storage section 26b via the supernatant water drain opening / closing valve 30a. Then, the end of the polluted water suction pipe 42b is faced to the polluted water storage chamber 27 via the polluted water drainage opening / closing valve 30c, and the tip of the washing water suction pipe 42c is passed through the washing water supply opening / closing valve 30b. The cleaning water reservoir 26a is faced, and the supernatant water suction pipe 42a, the polluted water suction pipe 42b, and the cleaning water suction pipe 42c are controlled to open and close so that the stored rainwater 14 is drained by a single pump 16. It can be controlled by the opening and closing of one pump and three off valve draining the supernatant water, wastewater polluted water, the supply of the washing water.

  In order to improve the quality of the stored rainwater pumped directly from the rainwater storage facility to the public waterway 18, the stored rainwater 14 is stopped in the rainwater storage tank 11, and the supernatant water layer 14a and the polluted water layer 14c are once separated. After the separation, the upper supernatant water layer 14 a is temporarily stored in the supernatant water storage chamber 26 facing the outlet side of the supernatant water drain port 24, and also on the outlet side of the polluted water drain port 25. The lower polluted water layer 14 c is temporarily stored in the polluted water storage chamber 27, and is separated into the supernatant water storage chamber 26 and the polluted water storage chamber 27 and drained to mix with each other. To prevent the water quality from deteriorating.

In order to minimize the amount to be treated at the final treatment plant of the sewer, a water flow suppression plate 33 for preventing the contaminated water layer 14c from mixing with the supernatant water layer 14a is provided in the rain water storage tank 11, and the rain water storage tank 11, a water flow path 31 is provided facing the drainage port 24 of the supernatant water, and the lower polluted water layer 14 c is prevented from flowing into the water flow path 31 of the supernatant water as much as possible.
As a result, the supernatant water layer 14a is discharged into the public water channel 18 as much as possible without further mixing the contaminated water layer 14c with the supernatant water layer 14a.

  In order to be able to wash the accumulated contaminants 21 attached to the rainwater storage tank 11 with a simple device as much as possible, a part of the supernatant water layer 14a is left in the supernatant water storage chamber 26, and the rainwater storage tank 11 After the inside drainage is finished, the supernatant water layer 14a left on the water flow suppression plate 33 or the washing water pipe 37 provided along the inner wall of the rainwater storage tank 11 is washed back.

A first embodiment of the present invention will be described below with reference to FIGS.
A rainwater storage tank 11 such as a rainwater storage pipe or rainwater storage tank is buried under a ground 10 such as a park, roadside, or river, with its drain end side slightly inclined, and the stored rainwater 14 is directed toward the drainage port 25. It has come down naturally. The rainwater storage tank 11 has, for example, a capacity of 10,000 m ³ or more, and is connected with a rainwater collecting channel 22 of the manhole 12, a rainwater collecting pipe 23, and the like for collecting rainwater.

  In addition, at the almost intermediate height of the rainwater storage tank 11, the supernatant water layer 14a flows along the inner wall, and two bowl-shaped flow channels 31 for flowing the washing water are between the inner wall. It is provided substantially horizontally with a spacer 34 so as to have a gap. These two flowing water channels 31 suppress the generation of water flow in which the bottom plate portion mixes the supernatant water layer 14a and the contaminated water layer 14c as shown in FIG. 9B. However, if there is a large gap between the two water channels 31, there is a risk of generating a water flow that mixes the supernatant water layer 14 a and the contaminated water layer 14 c as shown in FIG. In order to suppress this, two water flow suppression plates 33 are provided with a gap in the center, and in this water flow suppression plate 33, the pollutant 21 in the rainwater flowing in from the rainwater inflow pipe 13 falls to the bottom. Inclined towards the center.

  As shown in FIG. 4 (a), the flowing water channel 31 has a U-shaped cross-section, and the side plate facing the inner wall side of the rain water storage tank 11 is slightly lower than the opposite side, and the rain water storage A continuous mountain-shaped flow-out notch 32 for flowing the washing water 36 toward the inner wall of the tank 11 is provided. The flow channel 31 is not limited to a U-shaped cross section, and as shown in FIG. 4 (b), the cross section has a semicircular arc-shaped cross section, and a flow notch 32 is formed on one side plate. There may be.

  Outside the drainage end face of the rainwater storage tank 11, a polluted water storage chamber 27 and a supernatant water storage chamber 26 are separated from each other. Further, the drainage end surface of the rainwater storage tank 11 has a drainage port 24 for supernatant water at the top and a drainage port 25 for polluted water at the bottom. The flowing water channel 31 is provided through the drainage port 24 of the supernatant water, and the protruding end portion of the flowing water channel 31 faces the storage chamber 26 of the supernatant water through the gate 35. The water drain port 25 communicates with the polluted water storage chamber 27.

  A supernatant water pump 16a is installed in the supernatant water storage chamber 26, and a supernatant water discharge pipe 40a connected to the supernatant water pump 16a faces the public waterway 18 through a supernatant water drain opening / closing valve 30a. At the same time, it is made to face the flowing water channel 31 through the on-off valve 30b for supplying the washing water. In addition, a polluted water pump 16c is installed in the polluted water storage chamber 27, and the polluted water discharge pipe 40b connected to the polluted water pump 16c faces the sewer pipe 19 via the polluted water drainage on-off valve 30c. It has been done.

The operation of the stored rainwater treatment apparatus configured as described above will be described.
When the rain that has fallen on the ground 10 overflows from the rainwater collecting channel 22 and the rainwater collecting pipe 23, it is stored in the rainwater storage tank 11 through the rainwater inflow pipe 13. When the stored rainwater 14 is kept stationary for a certain period of time in the rainwater storage tank 11, the pollutant 21 sinks to the bottom through the two water flow control plates 33 and separates into the supernatant water layer 14a and the polluted water layer 14c. Is done.

The stored rainwater 14 stored in the rainwater storage tank 11 is suppressed by the bottom plate portion of the two flowing water passages 31 and the water flow suppression plate 33 from being generated by a water flow that mixes the supernatant water layer 14a and the contaminated water layer 14c. The supernatant water layer 14a is led to the supernatant water storage chamber 26 through the supernatant water drain port 24 by opening the gate 35 of the flowing water channel 31, and the polluted water layer 14c is connected to the polluted water drain port 25. After that, it is led to the storage chamber 27 of the polluted water.
The supernatant water layer 14a in the supernatant water storage chamber 26 is discharged into the public waterway 18 by opening only the supernatant water draining on-off valve 30a and driving the supernatant water pump 16a, and then discharged into the public water area. The supernatant water layer 14a in the supernatant water storage chamber 26 leaves the portion to be used as the washing water 36 without discharging all of it.
Next, the polluted water layer 14c in the polluted water storage chamber 27 is discharged into the sewer pipe 19 by opening only the polluted water draining on-off valve 30c and driving the polluted water pump 16c, and a sewage treatment facility (not shown). Clean up and discharge to public water.

After the drainage of the polluted water layer 14c in the polluted water storage chamber 27 is completed, only the cleaning water supply opening / closing valve 30b is opened, the gate 35 is closed, and the supernatant remaining in the supernatant water storage chamber 26 The water layer 14a is fed to the flowing water channel 31 by the supernatant water pump 16a. Then, the water flows backward through the flowing water channel 31 and overflows the notch 32 for flowing down from the flowing water channel 31 to become the washing water 36 as shown in FIG. 4 (a) or (b). It flows down along the inner wall. The washed water 36 causes the contaminants 21 on the inner wall of the rainwater storage tank 11 to be washed away to form a contaminated water layer 14 c and stored at the bottom of the rainwater storage tank 11. The polluted water layer 14c stored at the bottom of the rainwater storage tank 11 opens the polluted water drain opening / closing valve 30c again, drives the polluted water pump 16c, and discharges it to the sewer pipe 19.
In addition, the washing water 36 can use the clear water led from the water source which is not illustrated instead of the supernatant water layer 14a.

In the first embodiment, in order to suppress the mixed water flow of the supernatant water layer 14a and the contaminated water layer 14c, the two water flow suppression plates 33 have a gap at the center, and the pollutant 21 in the rainwater is at the bottom. Inclined toward the center so as to fall into the center.
However, the present invention is not limited to this. As shown in FIGS. 5 (a) and 5 (b), a vertical water flow such that there is a gap between the upper side and the bottom side of the rainwater storage tank 11 on the lower surface of the water flow channel 31. By disposing the suppression plates 33 at predetermined intervals, it is possible to prevent the polluted water layer 14c from being rolled up by the water flow when the supernatant water layer 14a flows out from the drain port 24 of the supernatant water.

In the first embodiment, in order to discharge the cleaning water 36, the flowing water channel 31 is made to flow backward and washed with the water that the notch 32 for flowing down overflows.
However, the present invention is not limited to this, as shown in FIG. 6, a number of injection holes 38 are formed in the lower part of the water flow channel 31 toward the inner wall of the rainwater storage tank 11, and one end is opened, You may make it arrange | position the washing water pipe | tube 37 which closed the other end. Then, the cleaning water pipe 37 is directly connected to the supernatant water discharge pipe 40a via the cleaning water supply opening / closing valve 30b at the opening end of the washing water pipe 37, and the fresh water supplied from the supernatant water layer 14a or other is pumped to the washing water pipe 37. The washing water 36 is jetted from the injection hole 38, and the contaminants 21 on the inner wall of the rainwater storage tank 11 can be washed away. Although the method according to the second embodiment has a higher cleaning effect than the cleaning with the overflowing water according to the first embodiment, it requires an output for pumping the cleaning water to the supernatant water pump 16a.

In the first embodiment, the supernatant water pump 16a for draining the supernatant water layer 14a and the polluted water pump 16c for draining the polluted water layer 14c are separated.
However, the present invention is not limited to this, and the supernatant water layer 14 a and the contaminated water layer 14 c can be drained by a single pump 16. That is, as shown in FIGS. 7A and 7B, a discharge chamber 41 is provided adjacent to the supernatant water storage chamber 26 and the contaminated water storage chamber 27, and the discharge chamber 41 and the supernatant water storage chamber 26 are provided. An upper gate 39a and a lower gate 39b are provided in the partition wall, and a polluted water gate 39c is provided in the partition wall between the discharge chamber 41 and the polluted water storage chamber 27.
First, only the upper gate 39a is opened, and the supernatant water layer 14a guided to the supernatant water storage chamber 26 is led into the discharge chamber 41 for drainage, and then only the polluted water gate 39c is opened to open the polluted water storage chamber. The polluted water layer 14c led to 27 is introduced into the discharge chamber 41 and drained. Thereafter, the polluted water gate 39c is opened, the supernatant water layer 14a is introduced into the discharge chamber 41 and sent to the water flow channel 31 or the washing water pipe 37 for cleaning. Finally, only the polluted water gate 39c is opened again to collect the polluted water storage chamber 27. The polluted water layer 14c led to is introduced into the discharge chamber 41 and drained.

FIGS. 8A and 8B show another example in which the supernatant water layer 14a and the polluted water layer 14c are drained by a single pump 16, and the supernatant water storage chamber 26 has a part of the bottom. The washing water reservoir 26a is made deeper, and the shallow water portion is called the supernatant water reservoir 26b. Then, the supernatant water suction pipe 42a of the pump 16 faces the bottom of the supernatant water storage section 26b, the cleaning water suction pipe 42c of the pump 16 faces the bottom of the cleaning water storage section 26a, and the dirty water suction pipe 42b of the pump 16 On the bottom of the polluted water storage chamber 27.
Then, only the supernatant water drainage opening / closing valve 30a is opened, and the supernatant water layer 14a guided to the supernatant water reservoir 26b is drained by the pump 16, and then only the polluted water drainage opening / closing valve 30c is opened to open the polluted water. The polluted water layer 14c guided to the storage chamber 27 is drained. Thereafter, the cleaning water supply opening / closing valve 30b is opened, and the supernatant water layer 14a led to the cleaning water reservoir 26a is sent to the water flow channel 31 or the cleaning water pipe 37 for cleaning, and finally, again for the drainage of polluted water. Only the on-off valve 30c is opened, and the polluted water layer 14c guided to the polluted water storage chamber 27 is drained.

It is a vertical side view which shows Example 1 of the processing apparatus of the stored rainwater by this invention. It is a cross-sectional top view of the processing apparatus of the stored rainwater in FIG. It is a vertical front view of the stored rainwater processing apparatus in FIG. The example from which the flowing water channel 31 by this invention differs is shown, (a) is a perspective view which shows a 1st example, (b) is a longitudinal cross-sectional view which shows a 2nd example. Example 2 of the processing apparatus for stored rainwater by this invention is shown, (a) is a vertical side view, (b) is a vertical front view. FIG. 3 shows a third embodiment of a treatment apparatus for stored rainwater according to the present invention, in which (a) is a longitudinal front view, and (b) is a plan view in which a wash water pipe 37 is partially cut away. Example 4 of the processing apparatus for stored rainwater by this invention is shown, (a) is a vertical plan view, (b) is a vertical side view. Example 5 of the processing apparatus of the stored rainwater by this invention is shown, (a) is a vertical plan view, (b) is a vertical side view. The conventional stored rainwater processing apparatus is shown, (a) is the whole longitudinal cross-sectional top view, (b) is explanatory drawing of a water flow.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Ground, 11 ... Rainwater storage tank, 12 ... Manhole, 13 ... Rainwater inflow pipe, 14 ... Reserved rainwater, 14a ... Supernatant water layer, 14b ... Intermediate water layer, 14c ... Polluted water layer, 15a ... Upper drainage port, 15b ... Intermediate drain, 15c ... Lower drain, 16 ... Pump, 16a ... Supernatant water pump, 16b ... Intermediate water pump, 16c ... Contaminated water pump, 17 ... Water flow, 18 ... Public waterway, 19 ... Sewer pipe, 20 ... Opening and closing Valve, 21 ... Polluted material, 22 ... Rainwater collecting channel, 23 ... Rainwater collecting pipe, 24 ... Supernatant water drain, 25 ... Polluted water drain, 26 ... Supernatant water storage chamber, 26a ... Wash water reservoir , 26b... Supernatant water storage section, 27... Polluted water storage chamber, 30 .. open / close valve, 30a .. supernatant water drain on / off valve, 30b .. wash water supply on / off valve, 30c .. polluted water drain on / off valve, 31. ... flow channel, 32 ... notch for flow down 33 ... Water flow suppression plate, 34 ... Spacer, 35 ... Gate, 36 ... Washing water, 37 ... Washing water pipe, 38 ... Injection hole, 39 ... Gate, 39a ... Upper gate, 39b ... Lower gate, 39c ... Polluted water gate, 40a ... supernatant water discharge pipe, 40b ... polluted water discharge pipe, 41 ... discharge chamber, 42a ... supernatant water suction pipe, 42b ... polluted water suction pipe, 42c ... wash water suction pipe.

Claims (9)

  In the stored rainwater treatment apparatus, the rainwater storage tank 11 stored in the rainwater storage tank 11 is statically separated into an upper supernatant water layer 14a and a lower polluted water layer 14c and drained by a pump 16. Provided at the drain end of the tank 11 is a supernatant water drain port 24 for draining the supernatant water layer 14a and a polluted water drain port 25 for draining the polluted water layer 14c, and communicates with the supernatant water drain port 24. The water flow path 31 is provided substantially horizontally along the inner wall of the rainwater storage tank 11 and faces the outlet side of the drainage port 24 of the supernatant water so as to temporarily store the supernatant water layer 14a. A storage chamber 26 is provided, a polluted water storage chamber 27 is provided to temporarily store the lower polluted water layer 14c facing the outlet side of the polluted water drain 25, and the inside of the supernatant water storage chamber 26 is provided. Supernatant water layer 14 A processing unit for storing rainwater, characterized in that as draining the the polluted water layer 14c of polluted water in storage chamber 27 in the pump 16 to distinguish each.   The water flow suppression plate 33 for preventing the lower polluted water layer 14c from being rolled up by the water flow generated when draining the upper supernatant water layer 14a is provided inside the rain water storage tank 11. Rainwater treatment equipment.   The water flow channel 31 communicating with the drainage port 24 of the supernatant water has a bowl shape with an upper opening, and the water flow channel 31 is attached with a gap between the inner walls on both sides of the rainwater storage tank 11. The apparatus for treating stored rainwater according to claim 1, wherein a notch 32 for flowing down is formed on a side wall on the inner wall side of the rainwater storage tank 11.   The flowing water channel 31 communicating with the drainage port 24 of the supernatant water has a bowl-like shape with an open top, and the flowing water channel 31 is attached along the inner walls on both sides of the rainwater storage tank 11. A cleaning water pipe 37 is attached to each of the inner walls on both sides of the storage tank 11 with a gap therebetween, and an injection hole 38 for injecting the cleaning water 36 pumped by the pump 16 toward the inner wall side is formed in the cleaning water pipe 37. The apparatus for treating stored rainwater according to claim 1, wherein:   A supernatant water drain on / off valve 30a and a wash water supply on / off valve 30b are connected to a supernatant water discharge pipe 40a for draining the supernatant water layer 14a in the supernatant water storage chamber 26, and this washing is performed. The apparatus for treating stored rainwater according to claim 3 or 4, characterized in that the wash water (36) is supplied to the water flow path (31) or the wash water pipe (37) via the water supply opening / closing valve (30b).   The flowing water channel 31 communicating with the drainage port 24 of the supernatant water has a bowl shape with an upper opening, and the flowing water channel 31 is attached along the inner walls on both sides of the rainwater storage tank 11, and rainwater is attached to these two flowing water channels 31. A water flow suppression plate 33 is provided which is inclined toward the bottom of the storage tank 11 and prevents the lower polluted water layer 14c from being rolled up by the water flow generated when the upper supernatant water layer 14a is drained. Item 1. A stored rainwater treatment apparatus according to item 1.   The flowing water channel 31 communicating with the drainage port 24 of the supernatant water has a bowl-like shape with an open top, and the flowing water channel 31 is attached along the inner walls on both sides of the rainwater storage tank 11, and rainwater is attached to these flowing water channels 31. A plurality of water flow restraining plates that form a substantially vertical plate opening at the top and bottom of the storage tank 11 and prevent the lower polluted water layer 14c from being rolled up by the water flow generated when the upper supernatant water layer 14a is drained. The apparatus for treating stored rainwater according to claim 1, wherein 33 is provided at predetermined intervals.   A discharge chamber 41 is provided adjacent to the supernatant water storage chamber 26 and the polluted water storage chamber 27, and an upper gate 39 a and a lower gate 39 b are provided on the partition wall between the supernatant water storage chamber 26 and the discharge chamber 41, A storm water gate 39c is provided in a partition wall between the sewage water storage chamber 27 and the discharge chamber 41, and the stored rainwater led to the discharge chamber 41 by controlling the opening and closing of the upper gate 39a, the lower gate 39b and the sewage water gate 39c. 14. The apparatus for treating stored rainwater according to claim 1, wherein 14 is drained by a single pump 16. The supernatant water storage chamber 26 includes a wash water storage portion 26a having a deep bottom and a supernatant water storage portion 26b shallower than the wash water storage portion 26a, and the suction side of one pump 16 is branched into three directions. A suction pipe 42a, a polluted water suction pipe 42b, and a washing water suction pipe 42c are formed, and the tip of the supernatant water suction pipe 42a is caused to face the supernatant water storage section 26b via the supernatant water draining on-off valve 30a, and the polluted water suction pipe 42b is formed. The tip of the cleaning water drainage opening / closing valve 30c is exposed to the contaminated water storage chamber 27, and the tip of the cleaning water suction pipe 42c is exposed to the cleaning water supply opening / closing valve 30b to the cleaning water reservoir 26a. The stored rainwater 14 is drained by a single pump 16 by controlling the opening and closing of the supernatant water suction pipe 42a, the polluted water suction pipe 42b, and the washing water suction pipe 42c. Processing apparatus of distillate rainwater.

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