CN112658024A - Soil purification device and soil purification method - Google Patents
Soil purification device and soil purification method Download PDFInfo
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- CN112658024A CN112658024A CN202010960069.4A CN202010960069A CN112658024A CN 112658024 A CN112658024 A CN 112658024A CN 202010960069 A CN202010960069 A CN 202010960069A CN 112658024 A CN112658024 A CN 112658024A
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Abstract
The invention provides a soil purification device and a soil purification method. Even if a building or the like is present on the upper part of the contaminated soil, the contaminated soil below the building or the like can be efficiently purified. A soil purification device having a soil heating device using an electrical heating method, the soil heating device comprising: a 1 st electrode (11) and a 2 nd electrode (12) which are inserted into the soil in a state of being opposed to each other and are composed of plate-like conductive members; and a power source (21) for generating a potential difference between the 1 st electrode (11) and the 2 nd electrode (12).
Description
Technical Field
The present invention relates to a soil purification apparatus and a soil purification method.
Background
One of the methods for purifying contaminated soil is an electric heating method. The electric heating method heats the soil by using electric energy, so that pollutants are separated from the soil to purify the soil.
In a soil purification apparatus for purifying soil by an electric heating method, a plurality of electrodes are buried in soil to be purified, a voltage is applied between the electrodes to cause a current to flow through the soil between the electrodes, and joule heat is generated by the resistance of the soil to heat the soil (see patent document 1). When the temperature of the soil rises, VOCs (Volatile Organic compounds) such as tetrachloroethylene, trichloroethylene, dichloroethylene, and trichloroethane adsorbed in the soil particles are desorbed from the soil and eluted into the groundwater. By performing a water-drawing process of drawing the groundwater to the ground, or a suction process of an underground gas containing VOC obtained by gasifying substances contained in the groundwater, etc., VOC can be removed from the soil, and the soil pollution can be purified.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2015-112556
Disclosure of Invention
Technical problem to be solved by the invention
When soil is cleaned by the electric heating method, there are advantages that the cost is low and the soil can be cleaned even in soil that is difficult to clean and is difficult to clean by injecting a chemical, as compared with a method of digging and carrying out the soil and then cleaning the soil. However, when a relatively large building or the like exists on the contaminated soil, the soil may not be heated efficiently.
Fig. 10 is an explanatory view showing the arrangement of the rod-shaped electrode 10 when a contaminated soil below a factory building is cleaned by a conventional method. In fig. 10, a plan view is shown in the upper part, and a vertical cross-sectional view is shown in the lower part.
When the factory building 101 is present on the contaminated soil, a plurality of rod-shaped electrodes 10 need to be embedded around the factory building in order to warm the soil by a conventional method. The arrangement of the plurality of rod-shaped electrodes 10 in this case is designed to allow the soil to be heated to a target temperature in consideration of the specific resistance value or specific heat capacity of the soil. Generally, the interval between the rod-like electrodes 10 is set to 2 to 6 meters in many cases. If the distance between the rod-shaped electrodes 10 becomes larger than this distance, it takes a long time for the soil to reach the target temperature, and the soil cannot be effectively cleaned.
However, as shown in fig. 10, in the case where the factory building 101 has a rectangular shape with a side of 20 meters, for example, even if the rod-shaped electrodes 10 are buried at intervals of 4 meters at a distance of 1 meter beside the factory building 101, the distance between the rod-shaped electrodes 10 disposed at the positions facing each other across the factory building 101 is 22 meters. When the distance between the rod-shaped electrodes 10 becomes large, it takes an extremely long time to heat the contaminated soil under the factory building 101, and it is virtually impossible to purify the soil.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a soil purification apparatus and a soil purification method capable of efficiently purifying contaminated soil even when a building or the like is present on the upper portion of the contaminated soil.
Means for solving the technical problem
The invention of claim 1 is a soil purification device comprising a soil heating device using an electric heating method,
the soil warming device has: a 1 st electrode composed of a plate-shaped conductive member and a 2 nd electrode composed of a plate-shaped conductive member buried in soil in a state of facing each other; and a power supply for generating a potential difference between the 1 st electrode and the 2 nd electrode.
Further, the invention of claim 2 is a method for purifying soil by an electric heating method, comprising:
an electrode embedding step of embedding a 1 st electrode composed of a plate-like conductive member and a 2 nd electrode composed of a plate-like conductive member in a soil to be heated in a state where the electrodes are opposed to each other;
and a soil heating step of generating a potential difference between the 1 st electrode and the 2 nd electrode.
Effects of the invention
According to the invention of claim 1 and claim 2, the contaminated soil can be efficiently purified even when a building is present on the upper portion of the contaminated soil due to the effect of the potential difference generated between the 1 st electrode and the 2 nd electrode, which are buried in the soil in a state of facing each other and are each composed of a plate-like conductive member. In addition, since the 1 st electrode and the 2 nd electrode are both formed in a plate shape, leakage of the contaminant released from the soil to the outside can be suppressed.
Drawings
Fig. 1 is a perspective view showing a schematic configuration of an embodiment of a soil cleaning device according to the present invention.
Fig. 2 is a schematic diagram showing an installation state of the soil heating device in the soil purification device of the present embodiment.
Fig. 3 is a perspective view of the 1 st electrode 11.
Fig. 4 is a graph showing the transition of the temperature of the soil.
Fig. 5 is a graph showing a potential difference between the 1 st electrode and the 2 nd electrode shown in fig. 2.
Fig. 6 is a graph showing the potential difference between the rod-shaped electrodes 10 disposed on both sides of the factory building shown in fig. 10.
Fig. 7 is a schematic view showing an installation state of the soil heating apparatus in a modification of the soil purifying apparatus according to the present embodiment.
Fig. 8 is a schematic view showing an installation state of the soil heating apparatus in another modification of the soil purifying apparatus according to the present embodiment.
Fig. 9 is a schematic view showing an installation state of a soil heating apparatus in a further modification of the soil purifying apparatus of the present embodiment.
Fig. 10 is an explanatory view showing the arrangement of the rod electrodes when the contaminated soil located under the factory building is cleaned by a conventional method.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 is a perspective view showing an outline of the soil cleaning device of the embodiment. Fig. 2 is a schematic view showing an installation state of the soil heating device in the soil purification device. In fig. 2, a plan view is shown in the upper part, and a vertical cross-sectional view is shown in the lower part.
This soil purification device is provided with a soil heating device 100, and this soil heating device 100 has: a 1 st electrode 11 and a 2 nd electrode 12 made of a plate-like conductive member; and a single-phase AC power supply 21 for generating a potential difference between the 1 st electrode 11 and the 2 nd electrode 12 by supplying a single-phase AC current to the 1 st electrode 11 and the 2 nd electrode 12. Further, the soil purification device has: a porous suction pipe 31 for sucking and removing at least one of gas and groundwater from the soil heated by the soil heating apparatus 100; a suction removing part 32 for discharging the gas or the ground water sucked from the suction pipe 31 through a pipe 33.
As shown in fig. 2, this soil purification apparatus is used, for example, to purify contaminated soil under a factory building 101 which has been built and is rectangular in a plan view. The 4 side walls of the factory building 101 are each about 20 metres wide. In contrast, the 1 st electrode 11 and the 2 nd electrode 12 have a width of about 20 m and a length of about 12 m in the vertical direction. As shown in fig. 2, the 1 st electrode 11 and the 2 nd electrode 12 are inserted into the soil along the respective side walls at positions 1 meter outside the pair of side walls facing each other in the plant building 101. Thus, the 1 st electrode 11 and the 2 nd electrode 12 are buried under the factory building 101 on both sides of the soil to be heated.
Fig. 3 is a perspective view of the 1 st electrode 11. The 2 nd electrode 12 also has the same configuration as the 1 st electrode 11. The 1 st electrode 11 is composed of a plurality of (6 in the example shown in fig. 3) steel sheet piles 50 having conductivity. The steel sheet pile 50 is also called a sheet pile (sheet pile), and is composed of a U-shaped body 51 and joint portions 52 on both sides thereof. The steel sheet pile 50 is generally used as a partition material in a bay, a river, or an earthwork. In this soil purification apparatus, the 1 st electrode 11 and the 2 nd electrode 12 are embedded from the ground into the soil while joining the joint portions 52 of the plurality of steel sheet piles 50 by a vibration hammer method, a press-in method, or the like.
The suction removal means composed of the porous suction pipe 31 and the suction removal portion 32 is used to remove VOC and the like in the soil heated by the soil heating apparatus 100. That is, when the temperature of the soil rises, VOCs such as tetrachloroethylene, trichloroethylene, dichloroethylene, and trichloroethane adsorbed to the soil particles are desorbed from the soil and eluted into the groundwater. Whereby the soil is purified. The suction removal means removes VOC from the soil by performing a water suction process of sucking groundwater up to the ground by the suction pipe 31 or a gas suction process of sucking an underground gas containing vaporized VOC, thereby more effectively purifying the soil pollution.
In fig. 1, the suction pipe 31 is shown in a state of being disposed between the 1 st electrode 11 and the 2 nd electrode 12, but when the factory building 101 is built on contaminated soil, it is difficult to bury the suction pipe 31 below the factory building 101. In this case, suction pipe 31 is embedded so as to be inserted from the periphery of factory building 101 toward the lower side of factory building 101.
When the soil purification apparatus having the above-described configuration is used to purify the soil below the plant building 101, the 1 st electrode 11 and the 2 nd electrode 12 are first inserted into the soil along a pair of side walls of the plant building 101 that face each other. Thus, as shown in fig. 2, the 1 st electrode 11 and the 2 nd electrode 12 are buried on both sides of the contaminated soil under the factory building 101. Then, the 1 st electrode 11 and the 2 nd electrode 12 are supplied with a single-phase alternating current by a single-phase alternating current power supply 21. Thereby, a potential difference is generated between the 1 st electrode 11 and the 2 nd electrode 12, and joule heat is generated by the resistance of the soil, so that the soil is heated. When the temperature of the soil rises, VOCs such as tetrachloroethylene, trichloroethylene, dichloroethylene, and trichloroethane adsorbed to the soil particles are desorbed from the soil and eluted into the groundwater. Then, the underground water is drawn up through the suction pipe 31, or the underground gas containing the gasified VOC is sucked from the underground water. This enables the soil to be purified. At this time, since the 1 st electrode 11 and the 2 nd electrode 12 are each formed of a plurality of steel sheet piles 50 and have a plate shape having almost the same width as the side wall of the factory building 101, leakage of the contaminant released from the contaminated soil to the outside of the soil can be suppressed.
Fig. 4 is a graph showing the temperature transition of soil at the positions of 3, 5, 7, 9, and 11 meters in depth at the intermediate position between the 1 st electrode 11 and the 2 nd electrode 12 in the case where the 1 st electrode 11 and the 2 nd electrode 12 are arranged in the state shown in fig. 2. In the figure, the horizontal axis represents the number of days (days) of energization, and the vertical axis represents the temperature (degrees centigrade).
As can be seen from the graph, it was confirmed that the temperature of the soil between the 1 st electrode 11 and the 2 nd electrode 12 was appropriately increased at each depth position.
Fig. 5 is a graph showing a potential difference between the 1 st electrode and the 2 nd electrode shown in fig. 2. Fig. 6 is a graph showing a potential difference between the rod-shaped electrodes 10 positioned on both sides of the plant building 101 shown in fig. 10 as a comparative example. In these graphs, the horizontal axis represents distance (meters) and the vertical axis represents voltage (volts).
As shown in fig. 5, the voltage gradient between the 1 st electrode 11 and the 2 nd electrode 12 is constant, and the voltage gradient (potential difference corresponding to each 1 m) thereof is [100V/22m ═ 4.5V/m ]. In contrast, as shown in fig. 6, the voltage gradient between the rod-shaped electrodes 10 is [40V/4m ] to 10V/m in the vicinity of the electrodes 10 (4 m, which is about 18% of the inter-electrode distance, and the region inside the electrodes 10), and [20V/14m ] to 1.4V/m in the vicinity of the center between the rod-shaped electrodes 10. Generally, if the current is the same, the greater the voltage gradient, the greater the joule heat generated in the soil. Therefore, in the case of the rod-shaped electrode 10 shown in fig. 10, although the temperature rises in the vicinity of the electrode 10 for a short time, it takes time for the temperature of the soil in the vicinity of the center to rise. In contrast, when the 1 st electrode 11 and the 2 nd electrode 12 shown in fig. 2 are used, the voltage gradient is constant, and the soil between the electrodes can be heated uniformly.
As described above, according to the soil purifying apparatus of this embodiment, even when the plant building 101 or the like is present on the upper portion of the contaminated soil, the contaminated soil under the plant building 101 can be efficiently purified by the action of the plate-like 1 st electrode 11 and 2 nd electrode 12 buried in the soil in a state where the contaminated soil is interposed therebetween and opposed to each other. Further, since the 1 st and 2 nd electrodes 11 and 12 are formed of the plurality of steel sheet piles 50, leakage of the pollutants released from the soil to the outside can be suppressed.
Next, a modified example of the soil purifying apparatus according to the above embodiment will be described. Fig. 7 is a schematic diagram showing an installation state of the soil heating apparatus in a modification of the soil purifying apparatus. In fig. 7, a plan view is shown in the upper part and a vertical sectional view is shown in the lower part.
The soil warming apparatus 100 shown in fig. 2 includes: a plate-shaped 1 st electrode 11 and a plate-shaped 2 nd electrode 12; the single-phase ac power supply 21 supplies a single-phase ac current to the 1 st electrode 11 and the 2 nd electrode 12, thereby generating a potential difference between the 1 st electrode 11 and the 2 nd electrode 12. In contrast, the soil heating apparatus 100A of this modification further includes: plate-shaped 3 rd and 4 th electrodes 13 and 14; the single-phase ac power supply 22 supplies a single-phase ac current to the 3 rd electrode 13 and the 4 th electrode 14. Although not shown, the 3 rd electrode 13 and the 4 th electrode 14 are also composed of a plurality of steel sheet piles 50, as with the 1 st electrode 11 and the 2 nd electrode 12. As shown in fig. 7, the 1 st electrode 11 and the 2 nd electrode 12 are buried in soil along a pair of side walls facing each other in a factory building 101 which is rectangular in a plan view. On the other hand, the 3 rd electrode 13 and the 4 th electrode 14 are inserted into the soil along the other pair of side walls of the factory building 101 which are opposed to each other.
As a result, the 1 st electrode 11, the 2 nd electrode 12, the 3 rd electrode 13, and the 4 th electrode 14 are embedded in the soil so as to surround the soil to be heated under the plant building 101. In addition, in order to prevent current from flowing between adjacent electrodes, the 1 st electrode 11, the 2 nd electrode 12, the 3 rd electrode 13, and the 4 th electrode 14 are disposed to be spaced apart from each other by a minute distance. However, the 1 st electrode 11, the 2 nd electrode 12, the 3 rd electrode 13, and the 4 th electrode 14 may be embedded in a state of being connected via an insulating member.
According to such a modification, the 1 st electrode 11 and the 2 nd electrode 12, and the 3 rd electrode 13 and the 4 th electrode 14, which are disposed to face each other, can heat the soil under the factory building 101 more effectively, and the soil can be cleaned more quickly. Further, since the soil under the factory building 101 is surrounded by the 1 st electrode 11, the 2 nd electrode 12, the 3 rd electrode 13, and the 4 th electrode 14 formed of the plurality of steel sheet piles 50, leakage of the pollutants released from the soil to the outside of the soil can be more effectively suppressed.
Next, another modification of the soil purifying apparatus of the above embodiment will be described. Fig. 8 is a schematic diagram showing an installation state of the soil heating apparatus according to the modification.
In this modification, soil below the factory building 102, which has a hexagonal shape in a plan view, is cleaned. Therefore, soil heating apparatus 100B in the soil purification apparatus of this modification includes: a 1 st electrode 11 and a 2 nd electrode 12; a single-phase ac power supply 21 for supplying a single-phase ac current to the 1 st electrode 11 and the 2 nd electrode 12; a 3 rd electrode 13 and a 4 th electrode 14; a single-phase ac power supply 22 for supplying a single-phase ac current to the 3 rd electrode 13 and the 4 th electrode 14; a 5 th electrode 15 and a 6 th electrode 16; and a single-phase ac power supply 23 for supplying a single-phase ac current to the 5 th electrode 15 and the 6 th electrode 16. The 1 st to 6 th electrodes are each composed of a plurality of steel sheet piles 50. As shown in fig. 8, the 1 st and 2 nd electrodes 11 and 12, the 3 rd and 4 th electrodes 13 and 14, and the 5 th and 6 th electrodes 15 and 16 are inserted into the soil along a pair of side walls opposed to each other in the factory building 102, respectively.
The 1 st, 2 nd, 3 rd, 4 th, 5 th and 6 th electrodes 11, 12, 13, 14, 15 and 16 are buried in soil so as to surround the soil to be heated below the factory building 102. In order to prevent current from flowing between adjacent electrodes, the 1 st electrode 11, the 2 nd electrode 12, the 3 rd electrode 13, the 4 th electrode 14, the 5 th electrode 15, and the 6 th electrode 16 are arranged at a minute distance from each other. However, the 1 st electrode 11, the 2 nd electrode 12, the 3 rd electrode 13, the 4 th electrode 14, the 5 th electrode 15, and the 6 th electrode 16 may be embedded in a state of being connected via an insulating member.
According to such a modification, the 1 st electrode 11 and the 2 nd electrode 12, the 3 rd electrode 13 and the 4 th electrode 14, and the 5 th electrode 15 and the 6 th electrode 16, which are disposed to face each other, can heat the soil under the plant building 102 more effectively, and can clean the soil under the plant building 102 more quickly. Further, since the soil under the factory building 102 is surrounded by the 1 st electrode 11, the 2 nd electrode 12, the 3 rd electrode 13, the 4 th electrode 14, the 5 th electrode 15, and the 6 th electrode 16, it is possible to more effectively suppress leakage of the contaminant released from the soil to the outside of the soil.
Next, a further modification of the soil purifying apparatus of the above embodiment will be described. Fig. 9 is a schematic view showing an installation state of a soil heating apparatus according to still another modification.
In this modification, soil below the factory building 103, which is triangular in plan view, is cleaned. Therefore, the soil heating apparatus 100C in the soil purification apparatus of this modification includes: the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19; and a three-phase ac power supply 24 for supplying three-phase ac current to the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19 to generate potential differences among the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19. The 1 st to 3 rd electrodes are each composed of a plurality of steel sheet piles 50. As shown in fig. 9, the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19 are inserted into the soil along 3 sidewalls of the factory building 103.
As a result, the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19 are buried in the soil so as to surround the soil to be heated below the factory building 103. In addition, the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19 are arranged at a minute distance from each other in order to prevent current from flowing between adjacent electrodes. However, the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19 may be buried in the soil in a state of being connected via an insulating member.
According to such a modification, the soil under the plant building 103 can be heated more effectively by the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19, and the soil under the plant building 103 can be cleaned more quickly. Further, since the soil under the factory building 103 is surrounded by the 1 st electrode 17, the 2 nd electrode 18, and the 3 rd electrode 19, leakage of the contaminant released from the soil to the outside of the soil can be more effectively suppressed.
In the soil purification device of the above embodiment, after the soil is heated, the suction removal mechanism performs water suction treatment, gas suction treatment, and the like. However, as described above, even warming the soil alone can purify the soil. Therefore, the water pumping process, the gas suction process, and the like by the suction removal mechanism can be omitted.
In the above embodiment, the electrode is formed by a plurality of steel sheet piles, but the electrode may be formed by 1 plate-like member having conductivity.
It will be appreciated by those skilled in the art that the above exemplary embodiments are specific examples of the following arrangements.
(embodiment 1)
One aspect of the present invention is a soil purification device including a soil heating device using an electrical heating method, the soil heating device including: a 1 st electrode and a 2 nd electrode which are buried in soil in a state of facing each other and are composed of plate-like conductive members; and a power source for applying a potential difference between the 1 st electrode and the 2 nd electrode.
According to the soil cleaning device of claim 1, even when a building or the like is present on the upper portion of the contaminated soil, the contaminated soil under the building or the like can be cleaned efficiently by the action of the 1 st electrode and the 2 nd electrode buried in the soil in a state of facing each other. Further, since the 1 st electrode and the 2 nd electrode are formed in a plate shape, leakage of the contaminant released from the soil to the outside of the soil can be suppressed.
(embodiment 2)
In the soil purification apparatus according to claim 1, the 1 st electrode and the 2 nd electrode may be formed of 1 or more steel sheet piles.
According to the soil purification apparatus of claim 2, the steel sheet piles which are generally used and sold can be used as electrodes, and can be buried in soil by a general method.
(embodiment 3)
The soil cleaning device according to claim 1 or 2, further comprising a suction/removal mechanism for sucking and removing at least one of gas and groundwater from an area of the soil heated by the soil heating device.
According to the soil cleaning apparatus of claim 3, at least one of the gas and the groundwater is sucked and removed from the region of the soil heated by the heating apparatus, and the soil can be cleaned quickly and efficiently.
(embodiment 4)
Another aspect of the present invention is a method for purifying soil using an electric heating method, comprising: an electrode embedding step of embedding a 1 st electrode and a 2 nd electrode, which are plate-like conductive members, in soil to be heated in an opposed state; and a soil heating step of generating a potential difference between the 1 st electrode and the 2 nd electrode.
According to the soil purification method of claim 4, the contaminated soil under a building or the like can be effectively purified even when the building or the like is present on the contaminated soil by the action of the 1 st electrode and the 2 nd electrode buried in the soil in a state of facing each other. Further, since the 1 st electrode and the 2 nd electrode are formed in a plate shape, leakage of the contaminant released from the soil to the outside can be suppressed.
(embodiment 5)
The soil cleaning method according to claim 4 may further include a suction removal step of removing at least one of gas and groundwater by suction from the soil heated in the soil heating step.
According to the soil cleaning method of claim 5, at least one of the gas and the groundwater is sucked and removed from the region of the soil heated by the heating device, and the soil can be cleaned quickly and efficiently.
(embodiment 6)
In the soil cleaning method according to claim 4 or 5, the 1 st electrode and the 2 nd electrode may be embedded so as to close at least a part of the periphery of the soil to be heated in the electrode embedding step.
According to the soil cleaning method of claim 6, since at least a part of the periphery of a building constructed on the soil to be heated is surrounded by the plate-like 1 st and 2 nd electrodes, leakage of the pollutants released from the soil to the outside can be suppressed.
The above description is for the purpose of describing the embodiments of the present invention, and is not intended to limit the present invention.
Description of the reference numerals
11. 17: 1 st electrode
12. 18: 2 nd electrode
13. 19: no. 3 electrode
14: the 4 th electrode
15: the 5 th electrode
16: 6 th electrode
21. 22, 23: single phase ac power supply
24: three-phase AC power supply
31: suction tube
32: suction removing part
33: pipeline
50: steel sheet pile
100. 100A, 100B, 100C: soil heating device
101. 102, 103: a factory building.
Claims (6)
1. A soil purification device having a soil heating device using an electrical heating method,
the soil heating device is provided with:
a 1 st electrode composed of a plate-shaped conductive member and a 2 nd electrode composed of a plate-shaped conductive member are inserted into soil in a state of being opposed to each other;
and a power supply for generating a potential difference between the 1 st electrode and the 2 nd electrode.
2. The soil decontamination device of claim 1,
the 1 st electrode and the 2 nd electrode are composed of 1 or more steel sheet piles.
3. The soil cleaning apparatus of claim 1 or 2,
the soil heating apparatus further includes a suction/removal mechanism for removing at least one of gas and groundwater by suction from the region of the soil heated by the soil heating apparatus.
4. A method for purifying soil by electric heating, comprising:
an electrode embedding step of embedding a 1 st electrode composed of a plate-like conductive member and a 2 nd electrode composed of a plate-like conductive member in a soil to be heated in a state of facing each other;
and a soil heating step of generating a potential difference between the 1 st electrode and the 2 nd electrode.
5. The soil decontamination method of claim 4,
further comprising a suction removal step of removing at least one of the gas and the groundwater by suction from the region of the soil heated in the soil heating step.
6. The soil cleaning method according to claim 4 or 5,
in the electrode embedding step, the 1 st electrode and the 2 nd electrode are embedded so as to block at least a part of the periphery of the soil to be heated.
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| JP2019189272A JP7268572B2 (en) | 2019-10-16 | 2019-10-16 | SOIL CLEANING DEVICE AND SOIL CLEANING METHOD |
| JP2019-189272 | 2019-10-16 |
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| CN112658024A true CN112658024A (en) | 2021-04-16 |
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