JP2006289300A - Purification method and apparatus of soil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a purification method and an apparatus of soil easily and surely purifying soil by repeatedly washing soil without disturbing the ground in the whole region of soil containing pollutants. <P>SOLUTION: Soil containing pollutants is purified by repeatedly conducting: pumping up of polluted groundwater W1 by a pumping means 10; purification of the pumped-up polluted groundwater W1 by a purification plant 20; magnetic field treatment of purified water W2 obtained by purifying the polluted groundwater W1 by a magnetic treatment machine 30; supply of the magnetic field-treated water W3 obtained by magnetic field-treatment of purified water W2 to the ground G via a water passage 40; and raising of a groundwater level lowered by pumping up of the polluted groundwater W1 to a given level by temporarily stopping pumping up of water. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a soil purification method and a purification device for purifying soil containing contaminants.

For example, nitrate nitrogen is used as an important fertilizer in agricultural activities, but is known to be a harmful substance (pollutant) that causes poisoning symptoms when consumed in large quantities.
However, nitrate nitrogen accumulated in soil due to repeated inputs as fertilizers, and contained in domestic waste (including domestic wastewater) and livestock waste, etc., is eluted into groundwater, resulting in a wide area. In some cases, groundwater containing pollutants flows into wells, etc., causing human damage.

Similarly, oils and volatile organic compounds that have flowed out of factories, waste disposal sites, etc., and have permeated the soil are also known to cause damage as pollutants.
Thus, soil contamination caused by many fields is a problem.

As a purification method of soil containing such contaminants, for example, (1) a method of adding a purification material to the contaminated soil in-situ and mixing with stirring (see, for example, Patent Document 1), (2) contaminated soil After excavating and washing the groundwater, refilling the groundwater (for example, see Patent Document 2), (3) After purifying the contaminated groundwater in the ground or on the ground, the groundwater is circulated by pouring the purified water into the ground Various techniques, such as a method for cleaning contaminated soil (see, for example, Patent Document 3) have been developed and put to practical use.
JP 2004-313997 A ([0009]-[0012], FIGS. 1 to 3) Japanese Patent Laying-Open No. 2005-040764 ([0014]-[0019], FIG. 1) Japanese Unexamined Patent Publication No. 2003-181436 ([0012]-[0016], FIG. 2)

However, the method of adding and purifying the purification material in-situ has the problem that the ground may be disturbed by stirring and mixing, and the strength of the ground may be reduced, which may cause adverse effects on the use of the site. .
In addition, when the contaminated area covers a wide area, there is a problem that it takes time and work to stir and mix the entire contaminated area, increasing time and cost.

  In addition, the method of cleaning the excavated soil has a problem that it takes time to work when the amount of soil is large, and since the excavated soil is backfilled, the strength of the ground decreases, There was a problem in that the use of the ruins might be harmful.

  Furthermore, in the so-called pumping treatment method, in which contaminated groundwater is purified and then poured into the ground, there is a problem that the groundwater that is circulated passes through the same water channel and the groundwater is difficult to permeate. As a result, there was a problem that the pollutant was not eluted and there was a part where washing of the soil was incomplete, or it took a lot of time to wash the soil completely. .

  The present invention has been made to solve such problems, and it is simple and reliable by repeatedly washing the soil without disturbing the ground for the entire soil region containing the pollutant. It is an object of the present invention to propose a soil purification method and a purification device that enable purification.

  In order to solve the above-mentioned problem, the invention described in claim 1 is a soil purification method for washing soil containing pollutants using groundwater, wherein the groundwater level is raised by pumping groundwater in a contaminated area. After lowering, the groundwater level lowered by pumping the groundwater is repeatedly raised.

According to the soil purification method, the groundwater level is raised by lowering the level of groundwater (hereinafter sometimes simply referred to as “groundwater level”) and the level of the groundwater is increased by adjusting the amount of pumped water, for example. By repeating the above, every time the water level is raised, the groundwater is distributed evenly over the entire contaminated area, or in the area containing the soil containing the pollutant (hereinafter sometimes referred to as “contaminated area” in this specification). Since a certain pollutant is eluted and recovered in the groundwater, it is possible to reliably clean the soil.
Moreover, according to this soil purification method, it is possible to clean the soil containing the pollutant with certainty only by adjusting the groundwater level by pumping water, so that the workability is excellent. Further, since the ground is not disturbed, a special treatment method (ground improvement work or the like) is not required when using the former site, and the whole is excellent in economic efficiency.

Further, in the soil purification method, if water is supplied to the contaminated area by using, for example, a water injection well, the amount of groundwater is not reduced by pumping, and the groundwater basin in the surrounding area is changed. Therefore, there is no adverse effect such as land subsidence or well withering, and the current natural system can be maintained, which is preferable.
In addition, by actively supplying moisture to the ground of the contaminated area, it becomes possible to change the water path of the groundwater flowing through the soil gap during pumping by adjusting the rate of rise of the groundwater level. Soil cleaning can be performed reliably and early.

  Moreover, if the supply of moisture to the contaminated area is performed by infiltrating from the ground surface in the soil purification method, the contaminants in the area above the groundwater level can also be eluted and washed away by this moisture. Therefore, it is possible to reliably clean the soil in the contaminated area.

  In addition, if the water permeated into the contaminated area in the soil purification method is purified water obtained by purifying the pumped ground water, it is not necessary to newly collect tap water or seawater or reduce the amount to be collected. Therefore, it is possible to reduce the cost required for the equipment and collection, which is preferable.

  Furthermore, in the soil purification method, if surface tension reduction treatment is applied to the moisture that penetrates into the ground, it is possible to accelerate the penetration of groundwater into the ground and to penetrate deeply, which is preferable. is there.

  The invention according to claim 6 is a soil purification method for washing soil containing pollutants using groundwater, wherein the groundwater in the contaminated area is pumped up, and water from the ground surface is introduced into the contaminated area. It is characterized by making it penetrate.

  According to the soil purification method, the groundwater is positively flowed in the area containing the pollutant, so that the groundwater is eluted and recovered, so that the soil is reliably washed. It is possible and preferable. In addition, since the supply of moisture to the contaminated area is performed by infiltrating from the ground surface, the contaminants in the area higher than the groundwater level can be eluted by this moisture and washed away.

  In addition, if the water in the soil purification method is purified water obtained by purifying the pumped groundwater, circulating the groundwater maintains the groundwater basin and affects the surrounding ecosystem. This is preferable.

  Furthermore, if the moisture is infiltrated into the ground after being subjected to surface tension reduction treatment, the water is excellent in permeability, and the soil cleaning speed is increased and the groundwater is infiltrated into the entire contaminated area to remove contaminants. Since it collects, it becomes possible to clean up the soil early and reliably, which is preferable.

  The invention according to claim 9 is a device for purifying soil containing a pollutant, wherein pumping means disposed in an area including the soil containing pollutant, and groundwater pumped by the pumping means Purifying means for purifying, surface tension reducing means for subjecting the moisture to a surface tension reducing process, and moisture supplying means for supplying the ground subjected to the surface tension reducing process by the surface tension reducing means to the ground. It is said.

  Such a soil purification apparatus is suitable because the soil is washed with the moisture supplied by the moisture supply means, and thus it is possible to collect and purify the contaminant contained in the soil without disturbing the ground.

  Further, in the soil purification apparatus, if the water supply means is a water channel formed on the ground surface or a spray means for spraying the water on the ground surface, it is possible to supply water over a wide area, which is preferable. is there. Moreover, by allowing water to permeate from above (the ground surface), it is possible to wash soil containing contaminants above the groundwater level, which is preferable.

  According to the soil purification method and the purification apparatus of the present invention, it is possible to easily and reliably purify the entire soil region containing the pollutant by repeatedly washing the soil without disturbing the ground. Become

Preferred embodiments of the present invention will be described with reference to the drawings. In the description, the same reference numerals are used for the same elements, and duplicate descriptions are omitted.
Here, FIG. 1 is a figure which shows the soil purification apparatus which concerns on 1st Embodiment, Comprising: (a) is a top view, (b) is a longitudinal cross-sectional view, (c) is the soil purification apparatus. It is an expanded sectional view showing details of a waterway concerning. Moreover, (a)-(c) of FIG. 2 is a longitudinal cross-sectional view which shows each step by the soil purification method which concerns on 1st Embodiment, respectively.
FIG. 3 is a longitudinal sectional view showing the soil purification apparatus according to the second embodiment, and FIG. 4 is a longitudinal sectional view showing the soil purification apparatus according to the third embodiment.

<First Embodiment>
The soil purification apparatus 1 according to the first embodiment (hereinafter may be simply referred to as “first embodiment”) is made of, for example, nitrate nitrogen as shown in FIGS. 1 (a) and 1 (b). The pumping means 10 disposed in an area including soil containing pollutants (hereinafter sometimes simply referred to as “polluted area”), and a purification plant (purifying means) for purifying the groundwater W1 pumped by the pumping means 10 20, a magnetic field processor (surface tension lowering means) 30 that performs a surface tension reduction process on moisture, and a water channel 40 that is a moisture supply means for supplying the surface subjected to the surface tension reduction process to the ground. The pollutant to be purified is not limited to nitrate nitrogen.

  The pumping means 10 includes a pumping well 11 that pumps the contaminated groundwater W1 formed in the contaminated area, a contaminated water pipe 12 that is piped so that the contaminated groundwater W1 pumped from the upper end of the pumping well 11 to the purification plant 20 can flow down, In order to pump up the groundwater W1, the pumping pump 13 is configured to provide a suction force to the pumping well 11.

  The pumping wells 11 are arranged in a plurality (9 in this embodiment) in or around the contaminated area so as to be able to collect all the contaminated groundwater W1 containing the pollutant through the contaminated area. Shall. Further, the pumping well 11 may be constructed by known means, and the structure thereof is not limited. In this embodiment, the pumping well 11 is purified into a vertical hole drilled in the vertical direction in the ground G of the contaminated area. A perforated tube filled with a material is arranged.

A contaminated water pipe 12 is connected to the upper end of the pumping well 11, and a connection portion between the upper end of the pumping well 11 and the contaminated water pipe 12 is shielded by a packer (not shown).
The contaminated water pipe 12 is connected to the purification plant 20, and is connected to a pumping pump 13 for applying a suction force for taking the contaminated groundwater W1.

  The purification plant 20 detoxifies the contaminated groundwater W1 pumped by the pumping means 10 to obtain purified water W2, and its configuration is not limited, and the contaminated groundwater W1 (contaminated soil) is contained. What is necessary is just to set suitably according to the kind of pollutant to be performed, the scale of a contaminated area, etc.

  Further, the magnetic field processor 30 applies magnetic field treatment to the purified water W2 that has been detoxified by the purification plant 20, thereby reducing the surface tension of the purified water W2 and easily penetrating the ground G. Is generated. In the first embodiment, the magnetic field processor 30 is adopted as the surface tension reducing means. However, if the surface tension of moisture can be reduced and the penetration force to the ground G can be increased, The configuration of the surface tension reducing means is not limited.

The water channel 40 supplies the magnetic field treated water W3 subjected to the magnetic field treatment by the magnetic field processor 30 to the ground G, and as shown in FIG. 1 (c), a groove formed on the ground surface of the contaminated area. 41, a supply pipe 42 which is a perforated pipe piped in the groove 41, and a crushed stone 43 filled in a gap (around the supply pipe 42) between the groove 41 and the supply pipe 42 in the groove 41. ing.
The water channel 40 is formed so as to be able to supply the magnetic field treated water W3 to the entire contaminated area. In the first embodiment, the water channel 40 is formed in a grid pattern as shown in FIG.

  Next, the soil purification method according to the first embodiment will be described with reference to FIG.

  The soil purification method according to the first embodiment includes (1) a pump that pumps the contaminated groundwater W1 in the contaminated area, (2) a purifier that purifies the contaminated groundwater W1 pumped by the pump, and (3) A surface tension reducing work for applying a magnetic field treatment to the purified water W2 purified by the purification work, (4) a water injection work for infiltrating the magnetically treated water W3 subjected to the magnetic treatment into the ground, and (5) a contaminated groundwater W1. It consists of a groundwater level raising work that raises the groundwater level WL lowered by pumping up to a predetermined height.

(1) Pumping works In the pumping works, the pumping means 10 pumps the contaminated groundwater W1 from the ground G, and as shown in FIG. 2 (a), it is kept at a constant height by the ground layer and groundwater quantity. Further, the natural groundwater level WL is continuously increased to a predetermined height as in the case of the groundwater level WL shown in FIG.

(2) Purification Works In the purification works, the purification plant 20 purifies the contaminated groundwater W1 taken (pumped) from the ground G by the pumping works.
As shown in FIGS. 2A and 2B, the contaminated groundwater W1 pumped by the pump is pumped to the purification plant 20 via the contaminated water pipe 12. And in the purification plant 20, the decontamination process is performed to the contaminated ground water W1, and the purified water W2 is produced | generated.

(3) Surface tension reduction process In the surface tension reduction process, the magnetic field treatment (surface tension reduction process) is performed on the purified water W2 generated by the purification process by the magnetic field processor 30 (see FIGS. 2A and 2B). .
Purified water W2, which is contaminated groundwater W1 that has been detoxified in the purifier, flows down to the magnetic field processor 30 and is subjected to magnetic field treatment. The magnetically treated water W3, which is the purified water W2 that has been subjected to the magnetic field treatment, is so-called highly osmotic water that has a reduced surface tension and is likely to penetrate into the soil gap.

(4) Water filling work In the water filling work, the magnetic field treated water W3 generated by the surface tension reducing work is infiltrated into the ground G by the water supply means (water channel 40) (see FIGS. 2A and 2B).
Here, the purification work, the surface tension reduction work, and the water injection work are performed in parallel with the water pumping work, but in the first embodiment, the pumping amount of the contaminated groundwater W1 by the water pumping means 10 is the magnetic field treatment by the water pouring work. Since it is larger than the amount of osmotic water of the water W3, the groundwater level WL is lowered as shown in FIG. Moreover, in 1st Embodiment, although the contaminated groundwater W1 pumped up by the pumping machine as water to be permeated into the ground G by the water injection work is purified, the magnetic field treated water W3 subjected to the magnetic field treatment is used. The supply source of moisture to be permeated into the ground G is not limited. For example, tap water, water collected from rivers, lakes, seas, or the like may be used.

(5) Groundwater level raising work When the groundwater level WL is lowered to a predetermined height by the pumping works, the pumping of the contaminated groundwater W1 by the pumping means 10 is temporarily stopped, so that the ground treatment water W3 and the groundwater that has flowed in naturally As shown in FIG. 2 (c), the groundwater level WL is raised. In the groundwater level raising work, the pumping by the pumping means 10 is not necessarily stopped. For example, the pumping amount of the contaminated groundwater W1 is reduced, and the amount of the magnetically treated water W3 that permeates the ground G is compared with the pumping amount. The groundwater level WL may be increased by increasing the amount of water.

  And if the groundwater level WL rises to a predetermined water level, the pumping by the pumping means 10 is resumed. By repeating this operation, the groundwater level WL in the contaminated area is repeatedly lowered and raised, and the soil containing the pollutant is washed.

In addition, in 1st Embodiment, it is set as the structure which makes water flow down to the water channel 40, without interlock | cooperating with the pumping pump 13 which provides the suction power to the pumping well 11, and temporarily stops pumping in a groundwater level raising work. In addition, the water is continuously supplied to the contaminated area (water is supplied to the contaminated area). At this time, the water supplied to the water channel 40 is purified water W2 stored in a ground water tank (not shown) due to a difference in the amount of water generated by the pumping power of the pumping means 10 and the penetration force of the magnetically treated water W3 into the ground G. It is assumed that magnetically treated water W3) or separately collected water is used.
Here, by interlocking the pumping pump 13 with the purification plant 20, the magnetic field processor 30 and the water channel 40, the supply of water from the water channel 40 to the contaminated area is stopped together with the stoppage of the pumping, and the groundwater level raising work is stopped. Needless to say, the construction may be performed by groundwater that naturally flows in.

  As described above, according to the soil purification method of the first embodiment, since the pumping of the contaminated groundwater W1 and the water injection of the magnetically treated water W3 are repeatedly performed, the soil containing the pollutant can be reliably washed, Contaminants present in the area can be completely removed.

  Moreover, since an excellent purification effect can be obtained only by adjusting the pumping amount, it is excellent in terms of work.

  In addition, after lowering the groundwater level WL by pumping the water through the pumping means 10 by the pump, the contaminated area is again immersed in the groundwater by the groundwater level raising work. Since it becomes possible to elute and collect the pollutants in the entire contaminated area in the groundwater, it is possible to reliably wash the soil containing the pollutants.

  Further, since the magnetically treated water W3 is supplied to the ground G by the water injection work through the water channel 40 formed on the entire surface of the contaminated area, the magnetically treated water W3 (cleaning water) is permeated from above the contaminated area. As a result, it is possible to wash away the contaminants in the region above the groundwater level WL and to reliably collect the contaminants.

  Further, since the water channel 40 is filled with crushed stone 43 around the supply pipe 42 in the groove 41, the surface of the water channel 40 is wide, and a film is formed due to oxidation of iron or the like contained in the permeated water (magnetic field treated water W3). This is preferable because the water supply to the ground G is not hindered. Note that the configuration of the water channel 40 is not limited to that described above, and for example, the same effect may be obtained by covering the periphery of the supply pipe 42 with palm fiber or the like.

  Moreover, since the structure of the purification apparatus 1 is only the pumping well 11, the purification plant 20, the magnetic field processor 30, and the water channel 40, it is the same scale as the conventional pumping water injection method, and it is not necessary to ensure a new site and is suitable. It is.

  In addition, since the pumping well 11 is filled with the purification material, the purification effect can be obtained together with the pumping of the contaminated groundwater W1, and the purification plant 20 can be simplified or omitted. Is possible.

<Second Embodiment>
As shown in FIG. 3, the soil purification apparatus 2 according to the second embodiment (hereinafter may be simply referred to as “second embodiment”) includes a region containing soil containing contaminants (hereinafter simply referred to as “second embodiment”). The pumping means 10 disposed in the “contaminated region”), the purification plant (purifying means) 20 for purifying the groundwater W1 pumped by the pumping means 10, and the magnetic field treatment for subjecting the moisture to a surface tension reduction process Machine (surface tension lowering means) 30 and water sprinkling pipe (spreading means) 44 which is a water supply means for supplying the ground G with water subjected to the surface tension lowering process.

  The pumping means 10 includes a pumping well 11 that pumps the contaminated groundwater W1 formed in the contaminated area, a contaminated water pipe 12 that is piped so that the contaminated groundwater W1 pumped from the upper end of the pumping well 11 to the purification plant 20 can flow down, In order to pump up the groundwater W1, the pumping pump 13 is configured to provide a suction force to the pumping well 11. In addition, since the detail of the pumping means 10 is the same as that of what was demonstrated in 1st Embodiment, detailed description is abbreviate | omitted.

  The purification plant 20 detoxifies the contaminated groundwater W1 pumped by the pumping means 10 to obtain purified water W2, and its configuration is not limited, and the contaminated groundwater W1 (contaminated soil) is contained. What is necessary is just to set suitably according to the kind of pollutant to be performed, the scale of a contaminated area, etc.

  Further, the magnetic field processor 30 applies magnetic field treatment to the purified water W2 that has been detoxified by the purification plant 20, thereby reducing the surface tension of the purified water W2 and easily penetrating the ground G. Is generated. Note that the magnetic field processor 30 according to the second embodiment is the same as that described in the first embodiment, and a detailed description thereof will be omitted.

The water spray pipe 44 supplies the ground G with the magnetic field treated water W3 that has been subjected to the magnetic field treatment by the magnetic field processor 30, and is composed of a perforated pipe that is piped on the ground surface of the contaminated area.
The sprinkling pipe 44 is piped so that the magnetic field treated water W3 can be supplied to the entire contaminated area.

Next, the soil purification method according to the second embodiment will be described with reference to FIG.
The soil purification method according to the second embodiment includes: (1) a pump that pumps the contaminated groundwater W1 in the contaminated area; (2) a purifier that purifies the contaminated groundwater W1 pumped by the pump; and (3) It consists of a surface tension lowering work for applying a magnetic field treatment to the purified water W2 purified by the purification work, and (4) a water injection work for infiltrating the magnetically treated water W3 subjected to the magnetic field treatment into the ground.

(1) Pumping works In the pumping works, the treatment capacity of the contaminated groundwater W1 in the contaminated area by the pumping means 10 is treated by the purification plant 20, the permeability of the magnetically treated water W3 sprinkled by the sprinkling pipe 44 to the ground G, etc. Continuously with the amount of pumping according to.

(2) Purification Plant In the purification plant, the purification plant 20 renders the contaminated groundwater W1 taken (ground) from the ground G by the pumping plant harmless.
The contaminated groundwater W1 pumped by the pump is transferred to the purification plant 20 through the contaminated water pipe 12. In the purification plant 20, the contaminated groundwater W1 is detoxified to generate purified water W2.

(3) Surface tension lowering work In the surface tension lowering work, the magnetic field treatment machine 30 subjects the purified water W2 generated by the purification work to a magnetic field treatment.
Purified water W2, which is contaminated groundwater W1 that has been detoxified by the purifier, flows down to the magnetic field processor 30 and is subjected to magnetic field treatment. The magnetically treated water W3, which is the purified water W2 that has been subjected to the magnetic field treatment, is so-called highly osmotic water that has a reduced surface tension and is likely to penetrate into the soil gap.

(4) Water filling work In the water filling work, the magnetic field treated water W3 that has been subjected to the magnetic field treatment by the surface tension reducing work is sprayed on the ground surface of the contaminated area through the water spray pipe 44 and penetrated into the ground G.

  The pumping work, the purification work, the surface tension reduction work and the water pouring work are performed in parallel so that the groundwater level WL is maintained.

  As described above, according to the soil purification method according to the second embodiment, the soil containing the pollutant is continuously washed by circulating water (groundwater) in the contaminated area, and the pollutant is introduced into the groundwater. Since it is recovered after elution, it is possible to reliably clean up the soil.

  Moreover, since the contaminated groundwater W1 containing the pollutant is detoxified in the purification plant 20 and then returned to the ground G as needed, ground subsidence due to a decrease in the groundwater level does not occur. Therefore, it does not affect the ecosystem and is preferable.

  In addition, since the contaminated area is constantly immersed in groundwater, the contaminants are eluted in the groundwater and can be completely removed.

  In addition, since the water (magnetic field treated water W3) is supplied from the ground surface by the water spray pipe 44, contaminants existing in the ground G higher than the groundwater level WL are also eluted and collected in the permeated water. The soil can be reliably purified.

<Third Embodiment>
As shown in FIG. 4, the soil purification apparatus 3 according to the third embodiment (hereinafter may be simply referred to as “third embodiment”) includes a region containing soil containing contaminants (hereinafter simply referred to as “third embodiment”). The pumping means 10 disposed in the “contaminated region”), the purification plant (purifying means) 20 for purifying the groundwater W1 pumped by the pumping means 10, and the magnetic field treatment for subjecting the moisture to a surface tension reduction process And a water injection well 45 which is a water supply means for supplying the ground G with the water subjected to the surface tension lowering process.

  The pumping means 10 includes a pumping well 11 that pumps the contaminated groundwater W1 formed in the contaminated area, a contaminated water pipe 12 that is piped so that the contaminated groundwater W1 pumped from the upper end of the pumping well 11 to the purification plant 20 can flow down, In order to pump up the groundwater W1, the pumping pump 13 is configured to provide a suction force to the pumping well 11. In addition, since the detail of the pumping means 10 is the same as that of what was demonstrated in 1st Embodiment, detailed description is abbreviate | omitted.

  The purification plant 20 detoxifies the contaminated groundwater W1 pumped by the pumping means 10 to obtain purified water W2, and its configuration is not limited, and the contaminated groundwater W1 (contaminated soil) is contained. What is necessary is just to set suitably according to the kind of pollutant to be performed, the scale of a contaminated area, etc.

  Further, the magnetic field processor is disposed between the purification plant 20 and the water injection pump 46, and performs a magnetic field treatment on the purified water W2 that has been detoxified by the purification plant 20, so that the surface tension of the purified water W2 is increased. Is generated, and magnetically treated water that easily penetrates into the ground G is generated. The magnetic field processor according to the third embodiment is the same as that described in the first embodiment, and thus detailed description thereof is omitted.

The water injection well 45 is a well that supplies the ground G with magnetic field treated water (purified water W2) that has been subjected to magnetic field treatment by a magnetic field treatment machine that is pumped through the water injection pump 46, and a plurality of wells are formed in the contaminated area. Yes.
In addition, although arrangement | positioning of the water injection well 45 is not limited, it shall arrange | position so that supply of the magnetic field treated water (purified water W2) to the whole contamination area | region is attained.

Here, since the soil purification method using the purification device 3 according to the third embodiment is the same as the soil purification method shown in the first embodiment, detailed description thereof is omitted.
Moreover, since the effect acquired by the purification apparatus 3 and the soil purification method which concern on 3rd Embodiment is the same as the content shown in 1st Embodiment, detailed description is abbreviate | omitted.

The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments, and it goes without saying that the above-described constituent elements can be appropriately changed in design without departing from the spirit of the present invention.
For example, in 1st Embodiment, when repeating a fall and rise of a groundwater level, the said groundwater level is changed every time, The structure which improves the washing | cleaning effect of soil by changing the water path of the groundwater which flows in the ground It is good. Similarly, it is good also as what improves the washing | cleaning effect of soil by changing the amount of pumping of contaminated groundwater and the supply amount of magnetically treated water at any time.

In each of the above embodiments, the pumped contaminated groundwater does not necessarily have to be returned to the ground. For example, after the purification process is performed by a purification plant, it may be discharged into a river or the like.
Needless to say, the increase in the groundwater level of the groundwater riser according to the first embodiment can be performed by the groundwater that naturally flows into the contaminated area.

Moreover, in each said embodiment, although the thing filled with the purification material was used as a pumping well, it cannot be overemphasized that the purification material does not necessarily need to be filled with the pumping well.
In addition, the soil may be accelerated by preliminarily mixing a substance or a drug effective for removing the pollutant with the moisture supplied to the contaminated area.

Moreover, in each said embodiment, although the form which provides a waterway or a sprinkling pipe and a water injection well separately was demonstrated, it cannot be overemphasized that a waterway or a watering pipe and a water injection well may coexist as a water supply means. Absent.
Moreover, in each said embodiment, it was set as the structure which performs the surface tension reduction process to the water | moisture content penetrate | infiltrated into the ground with a magnetic field processor, but it cannot be overemphasized that it is not necessarily necessary to perform the surface tension reduction process to a water | moisture content.
Furthermore, the structure of the water supply means according to the present invention is not limited to the water channel, the water spray pipe, and the water injection well shown in the above embodiments, and may be set as appropriate.

It is a figure which shows the purification apparatus of the soil which concerns on 1st Embodiment, (a) is a top view, (b) is a longitudinal cross-sectional view, (c) is an expanded sectional view which shows the detail of a water channel. (A)-(c) is a longitudinal cross-sectional view which shows each step by the purification method of the soil which concerns on 1st Embodiment, respectively. It is a longitudinal cross-sectional view which shows the purification apparatus of the soil which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view which shows the purification apparatus of the soil which concerns on 3rd Embodiment.

Explanation of symbols

1, 2, 3 Purification device 10 Pumping means 11 Pumping well 20 Purification plant (purifying means)
30 Magnetic field treatment machine (means for reducing surface tension)
40 water channels 44 watering pipes (dispersing means)
45 Injection well (moisture supply means)
G Ground WL Groundwater level W1 Contaminated groundwater W2 Purified water W3 Magnetically treated water

Claims (11)

A soil purification method for cleaning soil containing pollutants using groundwater,
A method for purifying soil, comprising: pumping up groundwater in a contaminated area to lower the level of groundwater and then repeatedly raising the level of groundwater lowered by pumping the groundwater.   The soil purification method according to claim 1, wherein moisture is supplied to the contaminated area.   The soil purification method according to claim 2, wherein the moisture is supplied by permeating from the ground surface.   4. The soil purification method according to claim 2, wherein the moisture is purified water obtained by purifying the pumped ground water.   The soil purification method according to any one of claims 2 to 4, wherein the moisture is subjected to a surface tension reduction treatment. A soil purification method for cleaning soil containing pollutants using groundwater,
A soil purification method characterized by pumping groundwater in a contaminated area and allowing water to permeate into the contaminated area from the ground surface.   The soil purification method according to claim 6, wherein the moisture is purified water obtained by purifying the pumped groundwater.   The soil purification method according to claim 6 or 7, wherein a surface tension lowering treatment is performed on the moisture. Pumping means located in a contaminated area including soil containing pollutants;
Purification means for purifying groundwater pumped by the pumping means;
Surface tension lowering means for applying a surface tension lowering treatment to moisture;
A soil purification apparatus comprising: moisture supply means for supplying moisture that has been subjected to surface tension reduction treatment by the surface tension reduction means to the contaminated area.   The soil purification apparatus according to claim 9, wherein the moisture supply means is a water channel formed on a ground surface.   The soil purification apparatus according to claim 9, wherein the moisture supply means is a spraying means for spraying the moisture onto the ground surface.

Images