JP2001173076A - Sewer pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewer pipeline capable of discharging excess sewage into a river or the like without containing sludge. SOLUTION: This sewage pipeline is provided with a filter device 4 using a granulated filter element 3 in a sewage discharge port 2 for discharging excessive sewage into a river or the like when sewage over the capacity of a pipeline 1 flows into the pipeline.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of discharging excess sewage into a river or the like without containing sludge when rainwater exceeding the capacity of the pipeline flows in rainfall in a diverted sewer pipe. About possible sewer pipes.

[0002]

2. Description of the Related Art In a combined sewage pipeline in which sewage such as domestic wastewater and rainwater flow through the same pipeline, a pipeline based on a flow rate that is obtained by multiplying the average rainfall throughout the year by a certain factor. The design is done.

However, the amount of rainfall in rainy weather is affected by various factors, and sometimes rainwater having a flow rate higher than the flow rate assumed at the time of pipe design flows into the sewage pipe.

In recent years, especially in urban areas, the paving of the ground has progressed, and the area where rainwater permeates the ground has tended to decrease, and the ratio of rainwater flowing into the sewer pipe among the rainwater that has rained has increased. As a result, rainwater that exceeds the design discharge even with a small amount of rainfall may flow into the sewer.

[0005] For the reasons described above, when rainwater at a design flow rate or more flows into the sewer pipe, sewage (mixed sewage and rainwater) that cannot be completely drained from the sewer pipe flows from the gutter along the sewer pipe into the road. Flooded the houses, etc.,
Various damages are caused. In addition, there is also a problem that environmental sanitation is deteriorated due to sewage and sewage flowing in the sewage pipe flowing out.

[0006] For this reason, in the combined type sewer pipe, sewage discharge ports (referred to as storm spouts) are provided at several places in the middle of the pipe.
The sewage is discharged to a river without performing sewage treatment in a flow path different from the pipe from the spillway to a sewage treatment plant, so that sewage does not overflow to roads and the like.

However, when rainwater flows in the early stage of precipitation, the flow rate of sewage in the sewage pipe rapidly increases, and solids and organic matter such as dirt accumulated in the pipe flow out at once. The quality of the sewage in the area is extremely poor.

[0008] Therefore, if such sewage is discharged into a river without performing sewage treatment, it may cause pollution of the river and deterioration of water quality.

For this reason, conventionally, a method has been employed in which a mechanical screen or filter cloth is installed in a rainwater spout to prevent solids such as dirt and organic substances from flowing out.

[0010]

However, there are the following problems in the above-mentioned conventional method for preventing the outflow of solids such as dirt in sewage and organic substances. (1) Method of installing a mechanical screen Although relatively large filth can be removed,
Since fine solids cannot be removed, and sewage containing sludge is discharged to rivers and the like, it is not perfect in preventing river pollution and deterioration of water quality. (2) Method of installing filter cloth Clogging is likely to occur, and it is necessary to constantly scrape sludge from the surface with a scraping device, etc. If the scraping device breaks down, clogging occurs and sewage flows into rivers. Periodic inspections are required because they can cause serious damage such as flooding roads without being released. The present invention has been made in order to solve the above-mentioned problems of the prior art, and requires a mechanism capable of removing fine solids and mechanically operating like a scraping device. The purpose is to provide a sewer pipe that is easy to maintain.

[0011]

A sewage pipe according to the present invention is provided with a granular filter medium at a sewage discharge port for discharging excess sewage to a river or the like when sewage exceeding the capacity of the pipe flows into the sewage pipe. This is provided with a filtration device using.

Further, the granular filter medium is a floating filter medium. Further, the granular filter medium is a non-floating filter medium. Further, the filter device is provided with a stirrer for stirring the filter medium.

In the sewage pipe of the present invention, a sewage discharge port for discharging sewage into a river or the like is provided with a filtration device using a particulate filter medium, so that sludge contained in sewage when sewage is discharged is provided. And other fine solids are filtered by the granular filter medium, so that sludge does not pollute rivers and the like.

Further, since the filter medium is a granular filter medium, it can be regenerated only by washing with water, and it is not necessary to correct the clogging of the filtration device by mechanical means. Therefore, the discharge of the sewage does not become impossible due to the mechanical failure, and the damage such as the overflow of the sewage due to the inability to discharge does not occur.

[0015]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing an example of a sewage pipe of the present invention. FIG. 1A is a side view of the sewage pipe in a state where sewage is not discharged from a sewage discharge port, and FIG. It is a side view of a sewage pipe in the state where sewage is discharged from a sewage discharge mouth.

In this sewage pipe, a sewage discharge port 2 is provided in the middle of a sewage pipe 1 buried in the soil 20. In the sewage discharge port 2, a granular floating filter medium 3 is placed. The used filtering device 4 is provided.

The sewage outlet 2 is provided vertically so as to surround an opening in which the upper surface of the sewage pipe 1 is cut off, and the side of the upper portion overflows from the sewage outlet 2. Overflow pipe 5 for discharging sewage into rivers, etc.
At the top, a manhole 6 for cleaning and checking the filtering device 4 is provided in contact with the ground 20a.

The filtering device 4 will be described in detail. The filtering device 4 is composed of a lower screen 7 provided at the lower end of the sewage discharge port 2 and the above-mentioned granular floating filter medium 3 and overflow pipe 5. And an upper screen 8 provided at a slightly lower position. When it is not raining, the sewage flows without filling the sewage pipe 1, and the sewage does not enter the sewage outlet 2. Therefore, FIG.
As shown in (a), the floating filter medium 3 in the sewage discharge port 2
Are deposited on the lower screen 7.

When a large amount of rainwater flows during rainfall,
The sewage in the sewage pipe 1 flows to fill the pipe, and finally enters the sewage discharge port 2. Then, the water level in the sewage discharge port 2 gradually rises, and when the water level reaches the level of the overflow pipe 5, the sewage is overflown.
The water is discharged from the flow pipe 5 to a river or the like.

When the sewage is discharged from the overflow pipe 5, the floating filter medium 3 in the sewage discharge port 2 rises while floating on the sewage, as shown in FIG. 1 (b). Thus, it is pressed against the upper screen.

As described above, the sewage is always supplied to the floating filter medium 3.
The sludge contained in the sewage is filtered by the floating filter medium 3. Therefore, the sludge is not discharged to the river or the like, and the river or the like is not polluted by the sludge.

When the rain stops, the amount of rainwater flowing into the sewage pipe 1 decreases, so that the level of the sewage in the sewage outlet 2 gradually decreases, and finally there is no sewage in the sewage outlet 2. . Then, as the water level decreases, the sludge floating below the floating filter medium 3 passes through the lower screen 7 and returns to the sewage pipe 1 again.

The floating filter medium 3 in the sewage discharge port 2 is also
The state is again deposited on the lower screen 7.

Since sludge adheres to the surface of the floating filter medium 3 after filtering the sewage, cleaning is performed to remove the sludge in anticipation of fine weather after rainfall. The cleaning is performed by supplying cleaning water or cleaning air from the manhole 6. If there is a gate valve in the middle of the sewer line 1,
The gate valve is tightened to temporarily raise the water level in the sewage discharge port 2 so that the floating filter medium 3 is floated on the water surface, and cleaning air is supplied through the manhole 6 into the sewage to perform cleaning. It is good to

FIG. 2 shows that the filtration device 4 has a stirrer 9 for stirring the filter medium.
It is explanatory drawing of the example of the sewer pipe of this invention provided with (a).
Is a side view of the sewer pipe without using the stirrer, (b)
FIG. 3 is a side view of a sewage pipe using a stirrer. The filtering device 4 provided with the sewage discharge port 2 of the sewage pipe is provided with a stirrer 9 for stirring and washing the floating filter medium 3. The stirrer 9 includes a rotating shaft 10, a stirring blade 11 provided on the rotating shaft, and a support member 12 that supports the rotating shaft 10 in the sewage outlet 2. The stirrer 9 is not provided with a power source for rotating the rotating shaft, and is provided at the upper end of the rotating shaft 10 with a joint that can be connected to a portable power source.

When the floating type filter medium 3 is stirred and washed, as shown in FIG. 2B, a rotating machine 22 mounted on a working vehicle 21 and a rotating shaft 10 of the stirring machine 9 are connected.
The washing is performed by rotating the stirring blade 11. Also in this case, it is preferable to raise the water level 2a in the sewage discharge port 2 by the method described above to perform the cleaning.

The stirring blades 11 are provided at two places, an upper stage and a lower stage. However, the upper stage stirring blades 11 do not fall down even when the sludge or the like is fixed at the upper part of the filtration device 4 and the water level falls. And so on.

There is no problem even if the power source of the stirrer 9 is provided in the manhole 6. As the granular floating filter medium 3, for example, polypropylene (specific gravity 0.9) or the like may be used. In addition, as a shape, in addition to a sphere, a cube, or an amorphous solid body, for example, a basket-shaped cube, a shape in which the seams of a sucker ball are framed, or a sphere like a sea urchin is used. A material having a high porosity such as a barbed shape may be used.

Further, it is not necessary to be strictly granular, even if it is granular, and it may be a short tube such as macaroni or a flake.

The size of the filter medium is 10 mm smaller than that of a small particle such as silica sand having a particle size of about 1 to 3 mm, since a method of preventing the filter medium from flowing out becomes difficult when the particle size is small. More than degree is good. Conversely, if the particle size is too large, the effect of collecting sludge and the like will be reduced. Therefore, the upper limit of the particle size is preferably about 50 mm.

In the description of the embodiment of the present invention, an example using a granular floating filter medium has been described.
If it is granular, it does not necessarily need to be a floating type, and a non-floating type granular filter medium may be used.

[0032]

According to the present invention, the sludge is not discharged into the river when the sewage is discharged, so that the river is not polluted with the sludge.

Further, since a driving means for preventing clogging of the filter medium is not required, a trouble due to a failure of the driving means can be avoided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of a sewer pipe of the present invention;
(A) is a side view of a sewage pipe in a state where sewage is not discharged from a sewage discharge port, and (b) is a side view of a sewage pipe in a state where sewage is discharged from a sewage discharge port.

FIG. 2 is an explanatory view of an example of a sewage pipe of the present invention in which a stirrer for agitating a filter medium is provided in a filtration device; FIG. 2 (a) is a side view of a sewage pipe without using a stirrer; () Is a side view of the sewage pipe in a state where the stirrer is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sewage pipe 2 Sewage discharge port 3 Filter medium 4 Filtration device 5 Overflow pipe 6 Manhole 7 Lower screen 8 Upper screen 9 Stirrer 10 Rotary shaft 11 Stirrer blade 12 Supporting member

Claims (4)

[Claims] 1. A sewage discharge port for discharging excess sewage to a river or the like when sewage exceeding the capacity of a pipeline flows in, is provided with a filtration device using a granular filter medium. Sewage pipeline. 2. The sewage pipe according to claim 1, wherein the granular filter medium is a floating filter medium. 3. The sewage pipe according to claim 1, wherein the granular filter medium is a non-floating filter medium. 4. The sewage pipe according to claim 1, wherein the filtration device is provided with a stirrer for stirring the filter medium.