JPH06299541A - Sewage treatment system using steel pipe column soil retaining wall - Google Patents

Abstract

(57) [Summary] [Purpose] The steel pipe column earth retaining wall is used as a sewage treatment device. [Structure] Steel pipes that are installed and buried in the construction of a building Steel columns 2 and 2 of the retaining wall are used, the lower end is closed with a bottom plate 5, and an inner pipe 6 is inserted and installed in the steel pipe, and the downflow is performed. It is formed in the deep aeration tank 1 having a channel 7 and an ascending channel 8. An aerator is provided in each of the aeration tanks 1 and 1, the aeration tanks 1 and 1 are communicated with each other, and the outer pipe (steel pipe) 1 of the aeration tank 1 at the end is communicated with the liquid reservoir 11. . Then, the circulating liquid is allowed to be fed from the liquid reservoir 11 into the inner pipe 6 of the aeration tank 1 at the starting end. Further, the inner pipe 6 is provided with a wastewater supply means 19 and a return sludge feed means 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment apparatus using a steel pipe of a steel pipe pillar row earth retaining wall.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
When constructing an underground structure part of a building, a retaining wall is installed on the ground surrounding the building. Among the retaining walls, the ones made of steel pipe columns that connect many steel pipes are
It has excellent proof strength and water blocking ability, but after being used as a temporary earth retaining material, it is buried as it is in other earth retaining walls, so its use is considered and as a basic structure of a building, Alternatively, it is being used as an underground wall for liquefaction countermeasures in the standing ground area of buildings and as a heat storage water tank for air conditioning equipment.

By the way, from buildings such as buildings and factories,
Domestic wastewater and industrial wastewater are discharged, but the industrial wastewater is discharged after being purified by a sewage treatment facility in each factory.
In addition, domestic wastewater is often discharged from sewers to rivers and the sea. In recent years, in order to prevent the deterioration of water quality in rivers and seas, it has been considered to install a treatment facility to purify domestic wastewater as well, and a large amount of wastewater is discharged from buildings, etc. It has become an issue to discharge the water and reuse the purified water.

However, the provision of the above-mentioned wastewater treatment facility requires a great deal of cost and requires a large installation place, which is difficult to realize.

The present invention has been made in view of the above circumstances, and by utilizing a steel pipe of a column of columnar soil retaining walls, which has been conventionally installed and buried in the construction of a building, as a treatment tank for purifying sewage. In order to reduce the cost of sewage treatment, a sewage treatment tank with a large capacity necessary for treatment can be provided at a low cost and without needing any place or space. To do.

[0006]

The structure of the device of the present invention for achieving the above object will be described with reference to the drawings corresponding to the embodiments. A required number of steel pipes in the steel pipe column row earth retaining wall A that have been installed are formed in bottomed aeration tank outer pipes 1, and inner pipes 6 that are long in the vertical direction are inserted into the outer pipes 1 and the descending flow path is formed. 7 and the ascending flow path 8 are formed in the aeration tank 1 and adjacent aeration tanks 1,
1 communicates with each other between the outer pipe 2 of the aeration tank 1 on the start end side and the upper portion of the inner pipe 6 of the next aeration tank 1, and the outer pipe 2 of the aeration tank 1 at the end communicates with the liquid reservoir 11. Further, in the inner pipe 6 of each aeration tank 1, 1, an air supply means 17, a wastewater supply means 19, a circulating liquid feeding means 14 from the liquid storage tank 11, and a returning sludge feeding means 20. Is provided.

[0007]

In the apparatus of the present invention, the required number of steel pipes installed for soil retention is used as the deep-layer aeration tank 1.
In each aeration tank 1, an outer pipe 2 and an inner pipe 6 form a descending flow path 7 and an ascending flow path 8. The sewage supplied to the aeration tank 1 at the starting end passes through the inside of each aeration tank 1, 1 from the descending flow path 7 to the ascending flow path 8
The sewage is biologically treated by the feeding of oxygen-containing gas from the air supply unit 17 and the feeding of returning sludge from the air supply unit 17, during which the sewage flows into the liquid storage tank 11. This circulation action is performed by the circulation pump P ₁ and the pipe line 14 from the liquid storage tank 11 to the aeration tank 1 at the beginning.
It is done by feeding the circulating fluid into the.

A part of the treated water in the liquid storage tank 11 is sent to a settling tank 13 through a vacuum degassing tower 12 for solid-liquid separation, the supernatant water is discharged to the outside of the system, and the precipitated sludge is partly aerated tank 1 It is sent back to, and the others are taken out of the system and processed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1 and FIG. 2, A is a steel pipe column row earth retaining wall installed in the ground adjacent to the building B to be constructed, and the building B is excavating and removing the ground surrounded by the earth retaining wall A, And is constructed adjacent to the inside of the retaining wall A.

As is well known in the art, the steel tube column row earth retaining wall is formed in a wall shape by connecting a large number of steel tubes 2 and 2 with joints 3 and 3. Generally, the excavation having a diameter larger than that of the steel tube 2 is carried out. Soil cement 4 is filled with continuous holes, and steel pipes 2, 2 are filled in it.
Are sunk while being connected to each other to form a column wall of the steel pipe. In the present invention, some or all of the steel pipes 2 and 2 of the steel pipe column wall are used as the outer pipe of the deep-layer aeration tank 1.

A steel pipe 2 used as an outer pipe of the aeration tank 1.
As shown in FIGS. 3 and 4, the reference numeral 2 is formed into a bottomed shape by providing a bottom plate 5 at its lower end, for example. In the case of using a steel pipe whose lower end is open, the soil cement 4 filled in the steel pipe 2 is removed by sunk to make it hollow, and then concrete is poured into the bottom to form a bottomed one. To do.
An inner pipe 6 that is thin and formed vertically long is inserted and arranged in the bottomed outer pipe 2 as described above, and a descending flow path 7 of the treated water is provided in the inner pipe 6 and rises outside thereof. The flow path 8 is formed, and the deep-layer aeration tank 1 is configured for each steel pipe (outer pipe) 2.

In the aeration tanks 1 and 1 described above, those adjacent to each other are sequentially connected between the outer pipe 2 of the aeration tank 1 on the starting end side and the upper portions of the inner pipe 7 of the aeration tank 1 located next. The upper part of the outer tube 2 of the aeration tank 1 at the terminal end is connected to the liquid storage tank 11 which is separately installed, and is connected to each other by the pipe 9. , 1 can be distributed in tandem. The liquid storage tank 11 is connected to the settling tank 13 via the vacuum degassing tower 12, and a part of the treated water in the liquid storage tank 11 is circulated as a circulating liquid to the aeration tank 1 at the leading end of the circulation pump P ₁ , It is designed to be delivered through a pipe line 14.

Further, in the upper part of the inner pipe 6 of each aeration tank 1,
An air supply device 17 for aeration, which is connected to the air supply pump 15 (see FIG. 1) through a pipe line 16, is provided. And, on the upper part of the inner pipe 6 of the aeration tank 1 at the start end, a separately installed waste water tank
Sewage is introduced through a pipe 19 connected to 18 (see FIGS. 1 and 2), and a part of the sludge is sent from the bottom of the settling tank 13 by a sludge return pump P ₂ and a pipe 20. It is supposed to be sent.

In the apparatus having the above structure, the sewage is a sewage tank.
A pipe 19 connected to 18 is fed to the upper part of the inner pipe 6 of the aeration tank 1 at the starting end, descends the descending passage 7, enters the ascending passage 8 from the lower end thereof, and ascends the same passage 8. It flows into the upper part of the inner pipe 6 of the aeration tank 1 located next from the upper outflow pipe 10. After that, the same flow is sequentially repeated to reach the terminal aeration tank 1 and the outflow pipe 10
Through to the liquid reservoir 11. Then, as a circulating liquid part of the treated water in liquid vessel 11, circulation is performed is fed to the starting end of the inner tube 6 top of the aeration tank 1 through line 14 by the circulation pump P _1. In this case, the liquid surface of the descending channel 7 is kept at a position higher than the liquid surface of the ascending channel 8 by an appropriate amount. In addition, the water level in each aeration tank 1, 1 gradually decreases from the beginning to the end.

Further, during circulation of the sewage, an oxygen-containing gas is supplied into the descending flow path 7 from an air supply device 17 connected to the air supply pump 15 through a pipe 16. This gas circulates together with the sewage that circulates from the descending channel 7 to the ascending channel 8, during which biological treatment by microorganisms in the sewage is performed, and the gas is released from the upper end of the ascending channel 8 under atmospheric pressure. When the upper end of the ascending flow path 8 is closed, it reaches the liquid reservoir 11 and is discharged under atmospheric pressure. In this way, the sewage passes through each of the aeration tanks 1 and 1 from the start end to the end and is sequentially purified.

A part of the treated water flowing into the liquid storage tank 11 is forcibly degassed in the vacuum degassing tower 12 and then sent to the precipitation tank 13 for solid-liquid separation, and the supernatant water is discharged to the outside of the system. A part of the sludge that has settled is sent to the upper part of each inner pipe 6 as a return sludge by the sludge return pump P ₂ through the pipe line 20.

[0017]

As described above, the sewage treatment apparatus of the present invention utilizes the steel pipes of the steel pipe pillar row soil retaining wall conventionally installed for building a building, and the required number of the steel pipes is set to Since it is formed in the aeration tank that performs biological treatment, a large capacity can be obtained at a low cost without requiring a special place, the construction cost of the wastewater treatment facility can be reduced, and the place required for the facility Will be advantageously secured.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an outline of a device of the present invention.

FIG. 2 is a schematic plan view of the same.

FIG. 3 is an enlarged vertical sectional view showing an embodiment of the device of the present invention.

FIG. 4 is a plan sectional view of the main part.

[Explanation of symbols]

A steel pipe column row earth retaining wall B building 1 aeration tank 2 steel pipe (outer pipe) 5 bottom plate 6 inner pipe 7 descending flow passage 8 rising flow passage 9 connecting pipe 10 outflow pipe 11 liquid storage tank 12 vacuum degassing tower 13 settling tank 14, 16 Pipeline 17 Air supply device 18 Sewage tank 19, 20 Pipeline P ₁ Circulation pump P ₂ Sludge return pump

Claims (1)

[Claims] The required number of steel pipes in the column of soil retention columns installed in the ground adjacent to the building are formed in bottomed aeration tank outer pipes, and a long inner pipe is inserted vertically in each outer pipe. , An aeration tank having a descending flow path and an ascending flow path, and connecting adjacent aeration tanks to each other between the outer pipe of the aeration tank on the starting end side and the upper part of the inner pipe of the next aeration tank. , The outer pipe of the aeration tank at the end communicates with the liquid storage tank, and the inner pipe of each aeration tank has an air supply means, a sewage supply means, a circulating liquid feeding means from the liquid storage tank, and a return sludge A sewage treatment device using a steel pipe column row earth retaining wall, characterized by being provided with a feeding means.