JP3166554B2 - Bags used for the purification method of contaminated soil - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for purifying contaminated soil.
The present invention relates to a bag body used for :

[0002]

2. Description of the Related Art Various types of wastes have been landfilled on landfill sites, sites of factories, etc., due to leakage of solvents used in factories, and disposal after use. in some cases the ground is has been generated <br/> the contaminated soil in the ground contamination. These contaminated soils may adversely affect the surrounding environment, and the ground containing such contaminated soils lacks reliability as the foundation ground for various structures. When planning the redevelopment of the site of a factory or the like, if it is discovered that such contaminated soil exists in the ground, it is desirable to immediately purify this and detoxify it.

[0003] The method of purifying such contaminated soil is generally classified into a method of treating in-situ volatile harmful substances and the like and a method of excavating and treating these substances. As a method of digging and treating contaminated soil, conventionally, for example, a method of putting a digged contaminated soil into a building such as a tent and agitating it with a backhoe or the like to perform aeration treatment, A method is known in which excavated contaminated soil is put into a screw conveyor via a hopper, and when the contaminated soil is moved while being stirred by the screw conveyor, it is heated at a low temperature to volatilize contaminants and the like. .

[0004]

However, the conventional method of excavating and treating contaminated soil involves a great deal of cost for installation work of a large-scale building and equipment such as a screw conveyor and a heating device. There was a problem that the purification operation could not be performed economically.

[0005] Further, in any of the methods, since the volatile contaminants are easily diffused into the working area, there is a problem that the surrounding working environment may be affected.

Accordingly, the present invention has been made in view of such a conventional problem, and is used in a method for purifying contaminated soil that can economically purify contaminated soil while avoiding the diffusion of contaminants. It is intended to provide a bag .

[0007]

SUMMARY OF THE INVENTION The present invention has been made in order to achieve the above object, the gist is to fill the contaminated soil, arranged an intake pipe communicates with the outside to the inside of its and causes a flow of air into the contaminated soil by extracting the air inside of that through the intake pipe, the contaminated soil by removing by carrying contaminants with volatile flow of such air the method of purifying contaminated soil you purification
It is a sealed bag to be used.
Along each of the flexible plastics as air ducts
Perforated pipes are attached and each of them is extended in parallel.
And these perforated pipes have an inlet opening.
Communicates with the distribution pipe at the end opposite the girder end
Through the pneumatic feed pipe attached to this distribution pipe
The supplied air can be sent inside
The bag is characterized in that it is formed.

[0008] The present invention also relates to a method for purifying contaminated soil according to the present invention .
The bag body is provided inside the bag body with an air pipe together with the air intake pipe in communication with the outside of the bag body, and the air taken into the bag body through the air pipe is taken in by the air suction pipe. Preferably, it is withdrawn via a tube.

Further, the method for purifying contaminated soil according to the present invention
The bag used can also take in heated air into the bag through the air supply pipe.

[0010]

According to the method for purifying contaminated soil according to the present invention, the excavated contaminated soil is easily charged into the bag body by, for example, a mini excavator or a manual operation of an operator, and the charging opening is closed. Thereby, the bag is easily sealed. Note that it is not always necessary to fill the inside of the preformed bag with the contaminated soil, and the contaminated soil may be wrapped in a sheet and then formed into a bag to form a bag.

[0011]

Then, by extracting the air inside the bag filled with the contaminated soil through the intake pipe, a flow of air is generated in the contaminated soil, so that the operation of purifying the pollutants can be easily performed. However, even if pollutants volatilize from the contaminated soil during such work, the volatilized contaminants are diffused to the surroundings by being carried in the air flow and by the bag being made of an airtight material. The purification operation can be performed without causing the cleaning operation.

It should be noted that the closed bag here does not mean only the bag in a state in which the ventilation to the outside through the surface of the bag is completely shut off. It has fine holes and gaps as long as it has a sealing property that can prevent the diffusion and diffusion of contaminants through the surface of the bag body to the outside in the state where the flowing air is generated. The air may be provided with a certain degree of air permeability. In such a case, fresh air for carrying the contaminant can be taken into the contaminated soil from the surface of the bag by the suction force of the intake air.

According to the present invention, if an air supply pipe as well as an intake pipe is disposed inside the bag body, air taken into the bag body via the air supply pipe is extracted through the intake pipe. Any airflow suitable for carrying contaminants that evaporate from the contaminated soil can be created in the contaminated soil, thereby enabling more effective cleaning operations.

If the heated air is taken into the bag through the air supply pipe, the volatilization of the contaminants can be promoted and the contaminated soil can be purified more quickly.

[0016]

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 and 2, the contaminated soil 1 dug from a landfill ground or a site of a factory.
Is filled in the bag body 2 in order to purify it.

The bag body 2 is a bag member whose one end 2a is openable and closable as a charging opening. The bag body 2 is made of a flexible and airtight sheet material made of, for example, synthetic resin and has a width of 5 m, a length of 5 m, and the like. It has a size such that the thickness at the time of filling the contaminated soil 1 is about 1 m. A flexible synthetic resin porous tube 3 as an air supply tube is attached to the bag body 2 in advance along each of the upper and lower inner surfaces thereof by, for example, welding or the like, and a plurality of each of the porous tubes 3 is provided in parallel with each other. The perforated pipes 3 are extended and communicate with a distribution pipe 10 provided at an end 2b opposite to the end 2a provided with the charging opening. Air supplied from a blower or the like via the sending pipe 11 can be sent to the inside of the bag 2. In addition, what is shown by the code | symbol 4 in the figure is an opening / closing valve used for opening / closing the air pressure feeding pipe 11 at the time of adjusting and supplying air to the perforated pipe 3.

Then, the contaminated soil 1 filled in the bag 2
Contains various volatile contaminants such as, for example, various organic chlorine compounds, benzene, and volatile mercury compounds.
After the charging opening is filled into the bag body 2 from the charging opening, by closing the charging opening, the inside of the bag body 2 is easily sealed and filled.

In this embodiment, a plurality of bags 2 filled with the contaminated soil 1 are accumulated in one place as shown in FIG.
Purification work is performed at the same time.

In order to perform the cleaning operation on the plurality of bags 2, the end 2 a of each bag 2 provided with the opening is provided.
From the insertion hole 12 formed in advance in the center part of
Each of the suction pipes 5 is inserted into the contaminated soil 1 inside the bag body 2, and the protruding end of each of the suction pipes 5 includes a gas-liquid separation tank 7, a vacuum pump 8, and an absorption tower 9 via a collecting pipe 6. Connect to purification equipment. The absorption tower 9 is filled with a contaminant absorbing substance such as activated carbon, and can easily detoxify and contaminate the contaminant passing therethrough.

Thereafter, the on-off valve 4 provided in the air pressure pipe 11 is released, air is supplied from the perforated pipe 3 to take in air into the bag body 2, and the vacuum pump 8 is driven to drive the suction pipe. If the air in the contaminated soil 1 is sucked out by the air 5 and the air is extracted therefrom, a flow of air is generated in the contaminated soil 1 from the perforated pipe 3 to the suction pipe 5 located at the center, and this air is discharged. By carrying the flow, volatile pollutants can be easily removed from the contaminated soil 1.

The air discharged through the suction pipe 5 while carrying volatile contaminants passes through the gas-liquid separation tank 7 to separate and remove the liquid, and further passes through the vacuum pump 8. The contaminant is introduced into the absorption tower 9, the contaminant is adsorbed and removed by the contaminant absorption substance, and only the purified air is discharged to the outside from the outlet 9 a of the absorption tower 9.

If heated air is used as the air supplied to the perforated pipe 3 through the air pressure pipe 11,
It is possible to promote the volatilization of the contaminants and remove the contaminants more quickly.

During the operation of removing the contaminants, the contaminated soil 1 inside the bag body 2 is maintained in a reduced pressure atmosphere in this embodiment, so that even if the contaminants are volatilized, the contaminated soil 1 is kept around. The cleaning operation can be performed without diffusion and without affecting the surrounding working environment.

When the purifying operation is completed, the on-off valve 4 is closed, the vacuum pump 7 is stopped, and the suction pipe 5 is removed from the bag 2 to complete the operation. Thereafter, the purified soil 1 can be taken out of the bag body 2 and backfilled at the original excavation site, or can be used as it is as a sandbag. Further, the removed equipment can be diverted.

In the above embodiment, the case where both the intake pipe 5 and the air supply pipe 3 are disposed inside the bag body 2 has been described, but the air supply pipe is not always required.
When the air supply pipe 3 is not provided, for example, by manufacturing the bag body 3 from a material having fine holes and air permeability,
By providing a valve for taking in air into the bag body 2, a flow of air toward the intake pipe 5 can be easily generated in the contaminated soil.

Further, in the above embodiment, the air supply pipe 3 is attached to the inner surface of the bag 2 in advance, but the air supply pipe 3 is
After charging the contaminated soil into the bag 2, it can be inserted and installed in the bag body 2.

[0028]

As described in the foregoing, according to the bag used in the method of purifying contaminated soil of the present invention, the contaminated soil was filled, air in the contaminated soil by the intake pipe is disposed in the interior of its With the simple configuration of generating a stream of water and carrying a volatile pollutant to the stream, the polluted soil can be economically purified while avoiding the diffusion of the pollutant to the surroundings.

Further, if an intake pipe and an air supply pipe are provided inside the bag body, and air taken into the bag body through the air supply pipe is extracted through the intake pipe, the arrangement position and the supply By adjusting the air volume, etc., any air flow suitable for carrying the pollutants volatilized from the contaminated soil can be generated in the contaminated soil, thereby performing more efficient purification work. Can be.

Further, if the heated air is taken into the bag through the air supply pipe, the volatilization of the contaminants can be promoted and the contaminated soil can be purified more quickly.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a method for purifying contaminated soil according to one embodiment of the present invention.

FIG. 2 is a schematic perspective view showing an embodiment of a method for purifying contaminated soil according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Contaminated soil 2 Bag 3 Perforated pipe (air supply pipe) 5 Intake pipe

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-179601 (JP, A) JP-A-5-212366 (JP, A) US Patent 5,078,852 (US, A) (58) Fields studied (Int .Cl. ⁷ , DB name) B09C 1/04

Claims (3)

(57) [Claims] 1. A to fill the contaminated soil, communicates with the outside to the inside of that is disposed an intake pipe, contaminated soil by extracting the air inside of that <br/> through the intake pipe Cleans contaminated soil by creating a stream of air through it and carrying and removing volatile pollutants from the stream of air.
Sealed bag der used purification methods of contaminated soil that
In advance, along each of the upper and lower inner surfaces, flexible
A porous tube made of flexible synthetic resin is attached,
These porous tubes are extended in parallel
However, the portion provided at the end opposite to the end provided with the input opening
Air pressure connected to the distribution pipe and attached to this distribution pipe
To supply air supplied through the pipe to the inside
A bag body characterized in that it can be made. 2. An air supply pipe is provided inside the bag body together with the air intake pipe in communication with the outside, and air taken into the bag body through the air supply pipe is extracted through the air intake pipe. A bag used in the method for purifying contaminated soil according to claim 1. 3. The bag used in the method for purifying contaminated soil according to claim 2, wherein heated air is taken into the bag through the air supply pipe.