JPH06299542A - Sanitary sewage treatment device by use of steel pipe column 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 2 and 2 of the column of earth retaining columns that are installed and buried in the construction of the building are used, the lower end of which is closed by the bottom plate 5, and the inner pipe 6 is inserted and arranged therein, and the downward flow is achieved. It is formed in a deep layer type aeration tank 1 having a channel 7 and an ascending channel 8. An air supply device 17 is provided in the inner pipe 6 of each aeration tank 1, and the upper portion of each outer pipe (steel pipe) 2 is connected to the liquid storage tank 11, and
The circulating liquid can be fed into each inner pipe 6 from the liquid reservoir 11. Further, each inner pipe 6 is provided with a wastewater supply means 19 and a return sludge transfer 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 being buried like other earth retaining walls. 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 a rising channel 8 are formed in the aeration tank 1, and a treated water extraction pipe 9 is provided on the upper part of each outer pipe 1, and this is a liquid storage tank separately installed.
11, the aeration means 17, the sewage supply means 19, the circulating liquid feeding means 14 from the liquid reservoir 11,
It is characterized in that a means 20 for feeding in the returned sludge 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, a descending flow path 7 and an ascending flow path 8 are formed by an outer pipe 2 and an inner pipe 6, and an upper portion of the outer pipe 2 is connected to a liquid storage tank 11 by an extraction pipe 9 and a confluence pipe 10. The liquid in the aeration tank 1 is sent from the liquid storage tank 11 to the upper part of the inner pipe 6 by the circulation pump P ₁ and the pipe line 14. The sewage supplied into the aeration tank 1 is circulated from the descending flow path to the ascending flow path and then to the liquid storage tank 11, at which time
Biological treatment of sewage is performed by feeding back the returned sludge and feeding the oxygen-containing gas from the air supply device 17.

A part of the treated water in the liquid storage tank 11 is sent to a settling tank 13 via 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. When a steel pipe having an open lower end is used, after removing the soil cement 4 filled in the steel pipe 2 by sinking to make it hollow,
Concrete is cast on the bottom to form a bottomed one. An inner pipe 6 which is thin and vertically long is inserted and arranged in the bottomed outer pipe 2 as described above, and a descending flow path 7 of treated water is provided in the inner pipe 6 and rises outside thereof. A channel 8 is formed, and each steel pipe (outer pipe) 2 has a deep layer aeration tank 1
Will be configured.

On the upper part of the outer pipe 2 of each of the aeration tanks 1, a treated water extraction pipe 9 is projectingly provided and connected to a confluence pipe 10, and the confluence pipe 10 is connected to a liquid storage tank 11 separately installed. It is connected. The liquid storage tank 11 is connected to the precipitation tank 13 via a vacuum degassing tower 12, and a part of the treated water in the liquid storage tank 11 is circulated as a circulating liquid to each aeration tank 1 by a circulation pump.
It is adapted to be fed to the upper portion of each inner pipe 6 by P ₁ and the pipe line 14.

Further, an air supply pump is provided above each inner pipe 6.
15 (see FIG. 1) is provided with an air supply device 17 for aeration, which is communicated by a pipeline 16, and a pipeline 19 connected to a separately installed wastewater tank 18 (see FIGS. 1 and 2) Sewage is sent in, and a part of sludge is sent from the bottom of the settling tank 13 by a sludge return pump P ₂ and a pipe 20.

In the apparatus having the above construction, the aeration tank 1 is formed independently for each steel pipe (outer pipe) 2.
For each aeration tank 1, the sewage is sent to the upper part of each inner pipe 6 from the conduit 19 connected to the sewage reservoir 18, descends the descending flow passage 7, enters the ascending flow passage 8 from the lower end thereof, and flows in the same flow. It goes up the path 8 and flows out from the treated water extraction pipe 9 in the upper part. The treated water that has flowed out flows into the liquid reservoir 11 through the confluence pipe. And the liquid storage tank 11
A part of the treated water is sent as a circulating liquid to the upper part of each inner pipe 6 through the pipe 14 by the circulation pump P ₁ for circulation. 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.

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.

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.

An air supply device 21 can be provided in the ascending flow path 8 of the aeration tank 1 as shown in FIG. Thereby, the sewage can be circulated without using the circulation pump P ₁ . It is also possible to use the air supply device 21 and the circulation pump P ₁ together.

[0018]

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 retaining wall B building 1 aeration tank 2 steel pipe (outer pipe) 5 bottom plate 6 inner pipe 7 descending passage 8 ascending passage 9 take-out pipe 10 joining pipe 11 liquid reservoir 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, a treated water extraction pipe is provided on the upper part of each outer pipe, and this is connected to a separately installed liquid storage tank, and each inner pipe is connected to Is equipped with an aeration means, a wastewater supply means, a circulating liquid feeding means from a liquid storage tank, and a feeding sludge feeding means, a wastewater treatment apparatus using a steel tube column soil retaining wall .