JPH10314714A - Method and device for removing soil contaminant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance recovery efficiency of soil contaminant. SOLUTION: The removal device of a contaminant is equipped with a bandlike adsorber 10, a traveling driving part and a release recovery part 14. The bandlike adsorber 10 is endlessly wound among rollers 20, 22, 24, circulated and traveled between the lower end side of an excavatingh hole 18 and the ground. The traveling driving part is installed on the ground side and equipped with both a motor axially connected to the top roller 20 and the driving source of the motor. The release recovery part 14 is installed on the ground side and constituted of a pinching roller 14a and a recovery tank 14b. The pinching roller 14a is provided under the top roller 20 and pinches the adsorber 10 which is circulated and traveled together with the top roller 20. Oil or the like is released by squeezing it adsorbed and held on an adsorption mat of the adsorber 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for removing soil pollutants, and more particularly to a technique for improving the efficiency of collecting and removing pollutants.

[0002]

2. Description of the Related Art In the vicinity of a storage facility for various oils such as crude oil, heavy oil, kerosene, light oil, and organic solvents, a crack is formed in an oil storage tank or a pipe for sending and discharging oils connected to the storage tank. Oil may flow out into the soil from such places.

[0003] The spilled oil diffuses through the groundwater flowing through the soil, widening the polluted area, which may be a serious social problem.

When groundwater is contaminated with such oils,
Conventionally, there is a problem that it is not suitable for beverages.
We were collecting.

When removing and recovering pollutants in groundwater, first, a drill hole is drilled so as to intersect with the groundwater flow containing the pollutants, and the contaminated groundwater is pumped by a submersible pump or the like. Contaminants and water are separated by a treatment facility installed on the ground side, the contaminants are collected, and the treated fresh water is discharged to sewers.

However, such a conventional method of removing contaminants has the following technical problems.

[0007]

That is, in the method of pumping contaminated groundwater with a pump, it is difficult to collect oils floating on the surface of the groundwater and also to pump uncontaminated groundwater together. The amount of treated water was increased, and this was an extremely inefficient removal method.

[0008] Further, as the amount of pumped water increases, the size of the treatment equipment also increases, which causes an increase in construction costs.

The present invention has been made in view of such a conventional problem, and its object is to provide:
An object of the present invention is to provide a contaminant removal method and a contaminant removal device capable of efficiently removing and collecting contaminants.

[0010]

SUMMARY OF THE INVENTION To achieve the above object, the present invention relates to a method for removing soil contaminants for recovering contaminants that have flowed into soil, the method comprising the steps of: A drilling hole is formed, and a belt-like adsorbent for adsorbing the pollutant is circulated between the lower side of the drilling hole and the ground, and the pollutant adsorbed by the belt-like adsorbent is separated and collected on the ground side. I did it. Also,
The present invention relates to a soil contaminant removal device for collecting contaminants that have flowed into soil, wherein a circulating travel is performed between a lower side of an excavation hole excavated so as to intersect a groundwater flow containing the contaminants and the ground. A strip-shaped adsorbent that is installed so as to adsorb the pollutant, a traveling drive unit for the strip-shaped adsorbent, and a detachment recovery unit provided on the ground side that detaches and removes the pollutant adsorbed on the strip-shaped adsorbent. It consisted of: According to the removal method and the removal device configured as described above, the contaminants in the groundwater are adsorbed on the belt-shaped adsorbent that circulates and travels,
Since it is separated and removed on the ground side, oils floating on the groundwater can be easily removed, and almost no pumping of uncontaminated groundwater occurs. The detachment / recovery section may be constituted by a roller that presses the strip-shaped adsorbent or a brush that slides along the surface of the strip-shaped adsorbent, and a collection tank that stores the pollutant detached by the roller or the brush. Can be. According to this configuration, the separation / recovery section can be obtained with a relatively simple structure, and cost reduction can be achieved.

[0011]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show one embodiment of a contaminant removing apparatus according to the present invention.

The apparatus for removing contaminants shown in FIG. 1 includes a strip-shaped adsorbent 10, a traveling drive unit 12, and a separation / recovery unit 14. As shown in FIG. 3, the band-shaped adsorbent body 10 includes a band-shaped belt 10a and a suction mat 10b laminated and attached to the front surface of the belt 10a.

The adsorption mat 10b has, for example, an oil adsorbent made of a polypropylene-based or polyethylene-based synthetic resin, and a large number of synthetic resin fibers electrostatically planted on the surface side. An adsorbent or the like having a three-dimensional structure aligned in one direction and having high adsorption efficiency of pollutants, specifically, oils, can be used.

In the case of the present embodiment, the band-shaped adsorbent 10 is
It is housed in a frame 16 formed in an inverted L-shape. The frame body 16 has a vertical portion 16a inserted into a grooved drilling hole 18 formed by drilling so as to be orthogonal to the groundwater flow containing oils O.
And a horizontal portion 16b connected to the upper end side of the vertical portion 16a and having the lower surface side installed on the ground surface.

The vertical portion 16a inserted into the borehole 18
Is provided with a large number of through holes (not shown) so that groundwater flows in and out.

In the frame 16, a top roller 20 located on the ground side and a bottom roller 22 located below the excavation hole 18 are rotatably provided.
A pair of intermediate rollers 24 is rotatably provided at the joint between the vertical portion 16a and the horizontal portion 16b.

The belt-shaped adsorbent 10 is composed of these rollers 20,
It is wound endlessly between 22 and 24, and is designed to circulate between the lower end of the excavation hole 18 and the ground.
Here, the belt-shaped adsorbent 10 is disposed so that its plane portion is orthogonal to the groundwater flow.

The traveling drive unit 12 is installed on the ground side and, as shown in FIG. 2, a motor 12a connected to the top roller 20 by a shaft, a driving source (generator, commercial power supply, battery) 12b for the motor 12a. It is composed of

As shown by the arrow in FIG. 1, the rotational direction of the motor 12a is such that the belt-shaped adsorbent body 10 wound between the rollers 20, 22, and 24 is positioned on the front side of the groundwater flow direction.
The operation is performed from below to above.

The detachment / recovery section 14 is provided on the ground side and includes a pressure roller 14a and a recovery tank 14b. The pressing roller 14a is provided below the top roller 20 and presses the adsorbent 10 circulating with the top roller 20 to squeeze the oil O adsorbed and held on the adsorbing mat 10b of the adsorbent 10. Let go.

The pressing roller 14a is connected to the frame 16
Alternatively, a structure in which the top roller 20 is rotatably supported may be used. A receiving portion 14c extending outward on one end side is provided in the recovery tank 14b. The receiving portion 14c has an open upper end, and a lower end provided with an inclined surface toward the collection tank 14b.

The recovery tank 14b thus configured is installed on the ground side such that the receiving portion 14c is located below the pressure roller 14a. In the contaminant removing apparatus configured as described above, the motor 12a of the traveling drive unit 12 is started to circulate and run the belt-shaped adsorbent 10 wound endlessly between the rollers 20, 22, and 24. , Adsorbent 10
When coming into contact with the groundwater containing oils O and going upward from below, the oils O floating on the groundwater are absorbed by the adsorption mat 10b.
To be held by suction.

The strip-shaped adsorbent 10 adsorbing and holding the oils O is:
When it moves to the ground side with the rotation of the motor 12a and reaches the pressure roller 14a, the oils O that are sucked and held at this portion are separated by being squeezed.

The separated oils O are received by the receiving portion 14c of the recovery tank 14b and then stored in the recovery tank 14b. The strip-shaped adsorbent body 10 from which the oils O have been separated circulates again to the lower side of the excavation hole 18 with the rotation of the motor 12a, and adsorbs the oils O by coming into contact with groundwater.

Since the oils O contained in the recovery tank 14b contain water, the oils O are separated into water and oils O by processing in an oil-water separation facility, and the oils O are collected. At the same time, Shimizu is discharged into the sewer.

According to the method and apparatus for removing contaminants configured as described above, since the strip-shaped adsorbent 10 is installed so that the surface of the strip-shaped adsorbent 10 is orthogonal to the groundwater flow, O can be evenly adsorbed on the surface, and the oils O floating on the groundwater surface can be easily and reliably captured.

Further, since the strip-shaped adsorbent 10 is circulated and run endlessly and the separating and collecting unit 14 is provided on the ground side, the oils O are automatically removed and collected, thereby saving labor. At the same time, costs can be reduced.

Further, since the belt-shaped adsorbent 10 adsorbs the oils O together with some water, the pumping amount of the groundwater is
Compared to the conventional method, the number of processes is very small, and the labor and time required for the processing are saved, the size of the processing equipment can be avoided, and the construction cost can be reduced.

The strip-shaped adsorbent 10 shown in the above embodiment is used.
Has been described as an example in which the belt 10a and the suction mat 10b are stacked, but the belt 10a does not need to be used as long as the suction mat 10b has strength enough to withstand the transmission of rotational force.

The pressing roller 14 of the separation / recovery device 14
a is provided with a brush that slides on the surface of the band-shaped adsorbent 10,
A structure in which the oils O are released by wiping the brush may be used, or a structure in which these are added may be used.

Further, in the above-described embodiment, the case where the excavation hole 18 or the strip-shaped adsorbent body 10 is arranged so as to be orthogonal to the flow of the groundwater is exemplified. However, the present invention is not limited to this. The adsorbent 10 may intersect with the groundwater flow.

[0032]

As described in detail in the above embodiments, the method and apparatus for removing contaminants according to the present invention can efficiently remove and recover contaminants.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view showing one embodiment of a contaminant removing apparatus according to the present invention.

FIG. 2 is an explanatory side view of FIG. 1;

FIG. 3 is a sectional view of a part C in FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Band-shaped adsorption body 10a Belt 10b Suction mat 12 Traveling drive part 12a Motor 12b Drive source 14 Separation collection part 14a Nipping roller 14b Collection tank 16 Frame 18 Drilling hole 20 Top roller 22 Bottom roller 24 Intermediate roller

Claims (3)

[Claims] 1. A soil contaminant removal method for collecting contaminants that have flowed into soil, comprising: forming a drilling hole so as to intersect a groundwater flow containing the contaminants; and adsorbing the contaminants. Circulating between the lower part of the excavation hole and the ground, and separating and collecting the contaminant adsorbed by the strip-shaped adsorber on the ground side. 2. A soil contaminant removal apparatus for collecting contaminants flowing out into soil, wherein the contaminants are circulated between a lower side of a borehole and a ground crossed with a groundwater flow containing the contaminants. A strip-shaped adsorbent that is installed movably and adsorbs the pollutant; a driving unit for driving the strip-shaped adsorbent; and a detachment and recovery provided on the ground side that detaches and removes the pollutant adsorbed by the strip-shaped adsorbent. And a soil contaminant removing device. 3. The detachment and recovery section includes a roller that presses the strip-shaped adsorbent or a brush that slides along the surface of the strip-shaped adsorbent, and a collection tank that stores the pollutant detached by the roller or the brush. The soil contaminant removal apparatus according to claim 2, comprising: