JP2003190933A - Method and apparatus for removing underground pollutant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for removing an underground pollutant, with enhanced removal efficiency. <P>SOLUTION: A mat 2 and a suction lid 3 airtightly cover the surface of the earth around the opening of an upper hole 10 and the opening of the upper hole 10. A water suction pipe 4 is inserted so as to pierce the suction lid 3 to reach the surface of ground water within the lower hole 11, which has a diameter smaller than that of the upper hole 10, provided to the bottom of the upper hole 10. A suction device 5 is provided so as to suck the gas in the upper hole 10. A vacuum pump 7 is connected to the water suction pipe 4 so as to suck ground water. <P>COPYRIGHT: (C)2003,JPO

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 underground pollutants for purifying pollutant gases in ground water and underground soil.

[0002]

2. Description of the Related Art As a conventional method and apparatus for removing underground pollutants, there is one disclosed in JP-A-7-284753. That is, a perforated pipe is inserted into a well hole provided in the ground, gas in soil is sucked from the perforated pipe, and groundwater flowing into the perforated pipe is sucked by a pump.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for removing underground pollutants, which has a higher pollutant removal effect than the prior art.

[0004]

In order to achieve the above object, the method for removing underground pollutants according to the present invention comprises a step of providing an upper hole on the ground surface, and a step of providing a bottom portion of the upper hole with a diameter smaller than that of the upper hole. Providing a lower hole, airtightly covering the opening of the upper hole and the ground surface around the opening, sucking the gas inside the upper hole to the outside, and the inside of the lower hole And a step of sucking groundwater from the pump.

The device for removing underground pollutants according to the present invention is
It has an airtight plate, a water suction pipe, a suction device, and a pump, and the airtight plate is provided so as to airtightly cover the opening of the upper hole provided on the ground surface and the ground surface around the opening. The water suction pipe is inserted through the airtight plate so as to reach the water table inside the lower hole having a smaller diameter than the upper hole provided at the bottom of the upper hole, and the suction device is installed inside the upper hole. Provided for sucking gas, the pump being connected to the suction pipe for sucking groundwater,
Characterize.

In the method and apparatus for removing underground pollutants according to the present invention, gas in soil is sucked out through the upper hole. Since the upper hole has a larger diameter than the lower hole, the contact area with soil is larger than that of the lower hole, and a wide range of gas can be sucked from the inner wall. Since the opening of the upper hole and the ground surface around the opening are airtightly closed, when sucking the gas inside the upper hole, only the gas in the soil can be sucked. When the gas is sucked from the upper hole, groundwater is simultaneously collected from the surrounding soil, and more groundwater is collected in the lower hole than when the gas is not sucked. For this reason,
More groundwater can be sucked from the bottom hole.
In the device for removing underground pollutants according to the present invention, the airtight plate may be made of a rubber mat, a lid or any other plate member having airtightness.

The apparatus for removing underground pollutants according to the present invention is
An airtight chamber, wherein the airtight chamber is connected to the pump and stores the water sucked by the pump; an aeration pipe that blows out air in the water inside the aeration tank; and an outside of the airtight chamber. It is preferable to have a gas purification section connected to the exhaust port to the inside. In this case, the groundwater sucked by the pump is stored in the aeration tank inside the airtight chamber,
It is aerated by the aeration pipe. The gas generated by the aeration is purified by the gas purifying unit and discharged from the exhaust port to the outside.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention. As shown in FIG. 1, the device for removing underground pollutants includes a lower hole pipe 1, a mat 2, a suction lid 3, a water suction pipe 4, a suction device 5, a gas purification device 6, and a vacuum pump 7. , A tank 8 and a groundwater purification device 9.

Before installing a device for removing underground pollutants,
On the ground surface where the contaminants are to be removed, the upper hole 1
0 is set. An example of the size of the upper hole 10 is a diameter of 20 cm to 30 cm and a depth of 1 m. Further, a lower hole 11 having a smaller diameter than the upper hole 10 is provided at the bottom of the upper hole 10. An example of the size of the lower hole 11 is a diameter of 5 cm.
The depth is 10 cm and the depth is 2 to 4 m. It is preferable that a crushed stone layer 12 is formed around the upper hole 10 and the lower hole 11. The lower hole tube 1 is inserted into the lower hole 11.

The mat 2 is made of an airtight rubber plate and is provided so as to airtightly cover the ground surface around the opening of the upper hole 10. The suction lid 3 is made of an airtight metal plate, and is provided so as to cover the opening of the upper hole 10 in an airtight manner. As an example, the range where the mat 2 and the suction lid 3 cover the ground surface is 4 with the upper hole 10 as the center.
It is m square. The gap between the mat 2 and the suction lid 3 is airtightly closed. The water suction pipe 4 penetrates the suction lid 3 and is inserted into the lower hole pipe 1 so as to reach the water table inside the lower hole 11.

The suction device 5 includes a blower 51 and a blower 5
1 and a suction tube 52 connected to 1. The suction device 5
One end of the suction pipe 52 is inserted into the upper hole 10, and the gas inside the upper hole 10 is sucked to the outside by a blower. The exhaust port 53 of the suction device 5 is connected to the intake 61 of the gas purification device 6. The gas purifier 6 is made by packing activated carbon inside the box, and adsorbs and removes underground pollutants contained in the gas taken in through the intake 61. The gas purification device 6 discharges the purified gas obtained by removing underground pollutants from the discharge port 62.

The vacuum pump 7 is connected to the water suction pipe 4 via a tank 8 so as to suck ground water. Thereby, the water suction pipe 4 sucks groundwater from the inside of the lower hole 11. The tank 8 is connected to the groundwater purification device 9.
The groundwater purification device 9 has an airtight chamber 91 inside.
The airtight chamber 91 has an aeration tank 92, an aeration pipe (not shown), and a gas purification unit (not shown) inside. Further, the airtight chamber 91 has an exhaust port 93 to the outside.
The aeration tank 92 is connected to the vacuum pump 7 via the tank 8 and stores water sucked by the vacuum pump 7. The aeration tank 92 is partitioned into a plurality of compartments, and the accumulated water flows into adjacent compartments due to overflow. A drain port 94 is provided in the most downstream section, and purified water is drained.

The aeration pipe has a plurality of ejection holes, and ejects air into the water inside the aeration tank 92 from the ejection holes. The water inside the aeration tank is purified by aeration. The gas purification unit
It is connected to the exhaust port 94. The purification unit is made up of activated carbon packed inside. The gas generated by the aeration is purified by the purifying unit and discharged to the outside through the exhaust port 94.

The underground pollutant removal device is used to remove trichlorethylene and other underground pollutants. The device for removing underground pollutants sucks the gas in the soil to the outside from the upper hole 10 by the suction device 5. Top hole 10
Has a larger diameter than the lower hole 11, the contact area with soil is larger than that of the lower hole 11, and a wide range of gas can be sucked from the inner wall. Since the opening of the upper hole 10 and the ground surface around the opening are airtightly closed, the upper hole 10
When sucking the gas inside, it is possible to suck only the gas in the soil. Therefore, the effect of removing contaminants can be enhanced as compared with the related art. The gas sucked by the suction device 5 is purified by the gas purification device 6 and discharged to the outside.

When the gas is sucked from the upper hole 10, at the same time, groundwater gathers from the surrounding soil, and more groundwater gathers in the lower hole 11 as compared with the case where the gas is not sucked. Therefore, a larger amount of groundwater can be sucked from the lower hole 11, and the effect of removing pollutants can be enhanced as compared with the conventional technique. The water sucked from the lower hole 11 is purified by the groundwater purification device 9 and drained.

[0016]

According to the present invention, it is possible to provide a method and an apparatus for removing underground pollutants having a high pollutant removal effect.

[Brief description of drawings]

FIG. 1 is a schematic view of an apparatus for removing underground pollutants according to an embodiment of the present invention.

[Explanation of symbols]

1 Lower hole tube 2 mat 3 suction lid 4 Water absorption pipe 5 suction device 6 gas purification equipment 7 vacuum pump 8 tanks 9 Groundwater purification device 10 Upper hole 11 Lower hole

Claims (3)

[Claims] 1. A step of providing an upper hole on the ground surface, a step of providing a lower hole having a diameter smaller than that of the upper hole at the bottom of the upper hole, and an airtight seal on the opening of the upper hole and the ground surface around the opening. Method, a step of sucking the gas inside the upper hole to the outside, and a step of sucking groundwater from the inside of the lower hole by a pump, the method for removing underground pollutants. 2. An airtight plate, a water suction pipe, a suction device, and a pump, wherein the airtight plate hermetically seals the opening of an upper hole provided on the ground surface and the ground surface around the opening. The water suction pipe is inserted so as to reach the water table inside the lower hole having a smaller diameter than the upper hole provided at the bottom of the upper hole through the airtight plate, and the suction device is An apparatus for removing underground pollutants, which is provided so as to suck gas inside the upper hole, and wherein the pump is connected to the water suction pipe so as to suck ground water. 3. An airtight chamber having an airtight chamber, wherein the airtight chamber is connected to the pump to store water sucked by the pump, and an aeration pipe for ejecting air in the water inside the aeration tank. The device for removing underground pollutants according to claim 2, further comprising a gas purifying unit connected to an exhaust port to the outside of the airtight chamber.