JP4360157B2 - Purification method and system for hardly air permeable and contaminated soil - Google Patents

Description

  The present invention relates to a purification method and system for recovering and purifying contaminants present in hardly permeable and air permeable contaminated soil.

  Various pollutants such as volatile organic chlorine compounds such as trichlorethylene, fuel oils and machine oils, dioxins, and heavy metals such as cadmium, lead, copper, zinc, nickel and chromium are found in the soil of the factory site. May be in the soil.

  If the contaminated soil contaminated with such contaminants is left as it is, the contaminants mixed in the soil will diffuse to the surroundings, hindering the lives of the surrounding residents, and if they are released from the soil particles by rainwater In addition, it may cause contamination of groundwater by contaminating water quality. Therefore, the soil contaminated with the above-mentioned pollutants must be cleaned using various methods.

  Various methods have been developed to purify pollutants in the soil in-situ, so-called water-cleaning methods that use the soil gas suction method, injecting water into the contaminated soil, pumping it up, and treating it on the ground. Various methods, such as the so-called bubble entrainment purification method, in which air is introduced and entrained pollutants in the bubbles, the air sparging method that combines pneumatic injection and gas suction, and the bioremediation method that utilizes the microbial activity of soil fungi The method is known.

JP 2002-119952 A JP 2001-205248 A

  However, when the pollutant is present in a hardly air permeable water permeable layer such as a clay layer or a silt layer, the above-described method cannot be employed. That is, since these hardly permeable air permeable layers have poor air permeability and water permeability, there is relatively little concern about the entry of contaminants. However, once the contaminants are mixed into the hardly permeable air permeable layer, as described above. On the other hand, the poor tempering and water permeability impeded purification, which caused the problem that it was very difficult to recover the pollutants from the hardly permeable air permeable layer.

  The present invention has been made in consideration of the above-described circumstances, and provides a purification method and system for hardly permeable and air permeable contaminated soil capable of reliably and efficiently recovering contaminants present in the hardly permeable and air permeable layer. For the purpose.

In order to achieve the above object, the method of purifying hardly permeable and air permeable contaminated soil according to the present invention is applied to a contaminated area contaminated with a pollutant in the unsaturated permeable and air permeable layer existing above the groundwater level. An oscillating body is embedded, and vibrations are applied to the soil particles in the contaminated area by driving the oscillating body, and the contaminants are entrained in the air that is pressed into the contaminated area or naturally flows into the contaminated area. A suction pipe provided above the contaminated area together with air to perform purification treatment , the vibrating body is a pile or sheet pile whose lower end is buried in the contaminated area, and an upper end of the pile or sheet pile It is characterized by comprising a vibro hammer to be attached.

In the method of purifying hardly permeable and air permeable contaminated soil according to the present invention, an oscillating body is embedded in a contaminated area contaminated with a contaminant in the unsaturated permeable and air permeable layer existing above the groundwater level, Vibration is applied to the soil particles in the contaminated area by driving the vibrating body, and the contaminants are taken together with the air above the contaminated area while entraining the pollutants in the air that is press-fitted into the contaminated area or naturally flows in. be one that performs suction and purification treatment by a suction pipe provided in, characterized in that the vibrating body constituted by a vibrator.

The system for purifying hardly permeable and air permeable contaminated soil according to the present invention includes the unsaturated hardly permeable and air permeable layer existing above the groundwater level, embedded in a contaminated area contaminated with a contaminant and driven by the operation. A vibrating body that imparts vibrations to the soil particles in the region, and a contaminant that is entrained in the air that is press-fitted into the contaminated region or that naturally flows into the region, is sucked together with the air by a suction pipe provided above the contaminated region, and is purified. be those with a gas treatment facility for performing, provided with a pneumatic input mechanism of injecting air into the contaminated region, the air press fit mechanism, contaminated region of the air discharge port said unsaturated flame permeability aquifer to the press-fitting tube which is embedded so as to be positioned, characterized in that it is composed of an air compressor which is connected to the piezoelectric pipe through the air tank.

The system for purifying hardly permeable and air permeable contaminated soil according to the present invention includes the unsaturated hardly permeable and air permeable layer existing above the groundwater level, embedded in a contaminated area contaminated with a contaminant and driven by the operation. A vibrating body that imparts vibrations to the soil particles in the region, and a contaminant that is entrained in the air that is press-fitted into the contaminated region or that naturally flows into the region, is sucked together with the air by a suction pipe provided above the contaminated region, and is purified. be those with a gas treatment facility for performing the gas processing facilities, the suction tube which is embedded in the unsaturated flame permeability aquifer or unsaturated permeability layer extending thereabove, to the suction pipe A connected gas-liquid separation tank; a suction blower connected to the gas-phase space of the gas-liquid separation tank; a harmful substance removal device connected to the suction blower; and a liquid-phase space of the gas-liquid separation tank this was composed of a communication connection to the water treatment facility The features.

  Further, in the purification system for hardly permeable and air permeable contaminated soil according to the present invention, the vibrator is composed of a pile or a sheet pile whose lower end is embedded in the contaminated area, and a vibro hammer attached to the upper end of the pile or sheet pile. It is composed.

  Moreover, the purification system of the hardly permeable and air permeable contaminated soil according to the present invention is configured such that the vibrator is configured by a vibrator.

  In the purification method and system for hardly permeable and air permeable contaminated soil according to the present invention, a vibrating body is buried in a contaminated area contaminated with a contaminant in the unsaturated permeable and air permeable layer, and the vibrator is driven. The operation imparts vibration to the soil particles in the contaminated area, and air is forced into the contaminated area or naturally flows into the contaminated area.

  When vibration is applied to the soil particles in this way, unlike the conventional air sparging method and bubble entrainment purification method, the soil particles collide with each other in the contaminated region of the unsaturated hardly permeable air permeable layer and the soil particles collide with each other. A new gap was created between the soil particles, the gap was larger than the original size, the skeleton of the soil particles was destroyed, and the soil particles rubbed against each other and adhered to the surface of the soil particles. Contaminants are stripped from the surface.

  In such a state, when air that is injected or naturally flows through the gaps between the soil particles, the flow resistance is greatly reduced, and contaminants attached to the soil particles are released into the gaps between the soil particles. As a result, pollutants are easily taken to the air.

  For this reason, if the contaminants are taken into the air that has been injected or naturally flowed in, and the contaminants are sucked together with the air in the gas treatment facility to perform the purification treatment, it is difficult to achieve the difficulty of the conventional air sparging method. It becomes possible to reliably and efficiently purify the air-permeable contaminated soil.

  Contaminants mainly include oil and volatile organic compounds (including volatile organic chlorine compounds), but any substance that can be air-entrained, such as dioxins, is included in the contaminants referred to in the present invention. .

  The hardly permeable air permeable layer in the unsaturated permeable air permeable layer mainly means a silt layer or a clay layer, but because of poor air permeability and water permeability, conventional methods such as water washing, gas suction, air sparging method, etc. If the pollutant cannot be recovered by the law, a soil layer containing sand in addition to silt or clay is naturally included in the hardly permeable air permeable layer referred to in the present invention.

  Whether forced intrusion or natural inflow of air into the contaminated basin may be appropriately determined in consideration of the depth of the unsaturated hardly permeable air permeable layer, etc. A press-fitting pipe provided with an air-fitting mechanism for press-fitting, the press-fitting pipe embedded in such a manner that an air discharge port is located in a contaminated region of the unsaturated hardly permeable air permeable layer, and the press-fitting pipe through an air tank It is conceivable that the air compressor is connected to the air compressor.

  Although the configuration of the gas treatment facility is also arbitrary, for example, the gas treatment facility includes a suction pipe embedded in the unsaturated hardly permeable air permeable layer or the unsaturated air permeable layer extending above, and the suction pipe. A connected gas-liquid separation tank; a suction blower connected to the gas-phase space of the gas-liquid separation tank; a harmful substance removal device connected to the suction blower; and a liquid-phase space of the gas-liquid separation tank It is conceivable to configure a water treatment facility connected in communication.

  As the arrangement form of the suction pipe, when the unsaturated hardly permeable permeable layer is deep, the suction pipe is horizontally embedded in the unsaturated permeable layer extending above the unsaturated hardly permeable permeable layer, or conversely, the unsaturated hardly permeable permeable layer. In the case where the air permeable layer is shallow, a form in which a borehole penetrating into the unsaturated hardly permeable air permeable layer is excavated vertically from the ground, and a suction pipe is inserted and disposed in the borehole is conceivable.

  In the above-described invention, the vibrating body may have any configuration as long as it can vibrate the soil particles in the contaminated region in the unsaturated hardly permeable air permeable layer. May be constituted by a pile or sheet pile embedded in the contaminated area and a vibro hammer attached to the upper end of the pile or sheet pile, or may be constituted by a vibrator.

  The present applicant has newly found that the soil particles can be vibrated by a vibrating body, thereby causing the above-described action, and thus improving the air permeability of the hardly air-permeable water-permeable layer. It should be noted that this is a very useful finding and has a remarkable effect as compared with the prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a purification method and system for hardly permeable and air permeable contaminated soil according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(First embodiment)

  FIG. 1 is a view showing a purification system for hardly air permeable and contaminated soil according to the present embodiment. As shown in the figure, the hardly permeable and air permeable contaminated soil purification system 1 according to the present embodiment includes a steel sheet pile 20 as a vibrating body, a vibro hammer 10 attached to the upper end of the steel sheet pile, and a saturated layer. Forcing air into the contaminated area 4 contaminated with the pollutant 3 such as oil, dioxins or volatile organic chlorine compounds in the unsaturated hardly permeable air permeable layer 2 existing above the groundwater level located at 6 An air pressure injection mechanism 5 for press-fitting and a gas processing facility 13 for performing a purification process by sucking the pollutant 3 together with the air after the pressurized air ascends the unsaturated air permeable layer 7 while entraining the pollutant 3. The lower end of the steel sheet pile 20 is embedded in the contaminated region 4 of the unsaturated hardly permeable air permeable layer 2, and the vibration is imparted to the soil particles in the contaminated region 4 by driving the vibro hammer 10. It is possible It has become way.

  Unsaturated hardly permeable air permeable layer 2 is made of soil mainly composed of silt, clay, or clay soil, and is poor in air permeability and water permeability. On the other hand, the unsaturated air permeable layer 7 is a soil layer made of sandy soil having air permeability.

  The air pressure input mechanism 5 includes an air compressor 12, an air tank 11 that intermediately stores the air supplied from the air compressor, and an air discharge port 8 connected to the air tank 11 with an unsaturated hardly air permeable water-permeable layer 2. The press-in pipe 9 is embedded so as to be located in the contaminated area 4, and air from the air compressor 12 can be press-fitted into the contaminated area 4 through the press-in pipe 9.

  The gas treatment facility 13 includes a suction pipe 14 embedded in the unsaturated gas permeable layer 7 extending above the unsaturated hardly gas permeable water layer 2, a gas-liquid separation tank 15 connected to the suction pipe, and the gas liquid A suction blower 16 communicatively connected to the gas phase space of the separation tank, an activated carbon filter tank 17 as a harmful substance removal device connected to the suction blower, and a water treatment communicatively connected to the liquid phase space of the gas-liquid separation tank It is composed of equipment 18.

  In order to install the purification system 1 for the hardly permeable and air permeable contaminated soil according to this embodiment, first, the pneumatic injection mechanism 5 is placed in the contaminated area 4 of the unsaturated permeable and permeable water permeable layer 2 that is contaminated with the contaminant. The press-in pipe 9 is installed.

  When the press-fit pipe 9 is installed, the corresponding position is bored in advance, and then the press-fit pipe 9 is inserted into the bore hole, and then the press-fit pipe 9 and the bore hole are prevented so that the air discharge port 8 is not blocked. In order to fix the press-fitting pipe 9 in between, a mortar, bentonite, etc. are filled in a space shallower than the air discharge port 8 in order to fix the press-fitting pipe 9.

  Next, an air tank 11 and an air compressor 12 are sequentially connected to the upper end of the press-fit pipe 9.

  The steel sheet pile 20 is driven so as to penetrate into the unsaturated gas permeable layer 7 before and after the installation of the press-fitting pipe 9, and the lower end thereof is contaminated with the pollutant in the unsaturated gas permeable layer 2. The vibro hammer 10 is attached to the upper end of the steel sheet pile 20. The steel sheet pile 20 may be driven with the vibro hammer 10.

  On the other hand, a suction pipe 14 is embedded in the unsaturated gas permeable layer 7 and a gas-liquid separation device 15 is connected to the suction pipe. Thereafter, as described above, the suction blower 16 and activated carbon are communicated with the gas phase space. The filter tank 17 is sequentially connected, and the water treatment facility 18 is connected so as to communicate with the liquid phase space.

  In order to purify the hardly permeable and air permeable contaminated soil, in this embodiment, the contaminated region 4 of the unsaturated permeable and permeable water permeable layer 2 using the purification system 1 installed in this way, first, the drive operation of the vibro hammer 10 is performed. Thus, vibration is imparted to the soil particles in the contaminated region 4 through the steel sheet pile 20, and the air compressor 12, the air tank 11, and the pressure vessel 10 are operated as appropriate so that the unsaturated hardly permeable air permeable layer 2. Air is injected into the contaminated area 4 of the air.

  In this case, unlike the conventionally performed air sparging method and bubble entrainment purification method, vibration is imparted by the vibro hammer 10 through the steel sheet pile 20, so that in the contaminated region 4 of the unsaturated hardly permeable air permeable layer 2. The soil particles collide with each other to form a new gap between the soil particles, the gap becomes larger than the original size, the skeleton of the viscous soil is destroyed, and the soil particles rub against each other. Contaminants attached to the surface of the soil particles are peeled off from the surface.

  FIG. 2 shows an example of the case where the skeletal fracture of the viscous soil occurs, and FIG. 2A shows the skeleton of the viscous soil before the driving operation of the vibro hammer 10. b) schematically shows the skeleton of the cohesive soil after such a driving operation.

  As can be seen from these figures, the skeleton of the viscous soil is broken by the driving operation of the vibro hammer 10 so that the soil particles are separated, the voids 21 are newly formed, and the contaminant 3 attached to the surface of the soil particles 3 Peels from the soil particles.

  Even when the skeleton is not destroyed, a new gap is generated by the driving operation of the vibro hammer 10 or the original gap is increased. Thus, the air 22 press-fitted through the press-fitting pipe 9 is When flowing through the gaps 21 between the soil particles, the flow resistance is greatly lowered and the flow is facilitated, and the contaminant 3 adhering to the soil particles is released in the gaps 21 between the soil particles. 3 is also easily taken to the air 22.

  Next, after the pressurized air 22 moves up the unsaturated air permeable layer 7 while entraining the pollutant 3, the pollutant 3 is sucked together with the air 22 by the gas treatment facility 13 to perform a purification process. Suction is performed by operating the suction blower 16.

  Next, the sucked pollutant entrained air is separated into liquid and gas in the gas-liquid separation tank 15, and the gas is passed through the activated carbon filter tank 17 to adsorb the pollutant 3 on the activated carbon, and then released to the atmosphere. At the same time, for the liquid, the pollutant 3 is removed by the water treatment facility 18 and then discharged into a river or the like.

  Even in the case of the unsaturated air permeable layer 7, the substance to be sucked is not only gas but also moisture is sucked in some amounts depending on weather conditions such as rainfall, and therefore the gas-liquid separation tank 15 is interposed. Needless to say, it is desirable to install the water treatment facility 18.

  As described above, according to the purification method and system for hardly permeable and air permeable contaminated soil according to the present embodiment, unlike the conventional air sparging method and bubble entrainment purification method, the steel sheet pile 20 is interposed. By applying vibration to the contaminated area 4 by the vibro hammer 10, the soil particles collide with each other to create a new gap between the soil particles, the gap becomes larger than the original size, or the soil particle skeleton is destroyed. At the same time, the soil particles rub against each other, so that the contaminant 3 attached to the surface of the soil particles is peeled off from the surface.

  In such a state, when the injected air 22 flows through the gap between the soil particles, the flow resistance is greatly reduced, and the contaminant 3 attached to the soil particles is released into the gap between the soil particles. Therefore, the contaminant 3 is also easily taken to the air 22.

  For this reason, if the injected air 22 moves up the unsaturated air permeable layer 7 while entraining the pollutant 3, and then purifies the pollutant 3 together with the air 22, a conventional air sparging method, etc. Then, it becomes possible to reliably and efficiently purify the unsaturated hardly permeable air permeable layer 2 that was impossible.

  In the present embodiment, the steel sheet pile 20 is employed as a member that transmits the excitation force of the vibro hammer 10 to the contaminated region 4. However, any material can be used as long as vibration can be imparted to the soil particles in the contaminated region 4. Such a member may be used. For example, a pile can be used instead of the steel sheet pile 20.

  In the present embodiment, air is forcibly injected into the contaminated region 4 of the unsaturated hardly permeable air permeable layer 2 using the pneumatic insertion mechanism 5, but for example, the unsaturated hardly permeable air permeable layer 2 is compared. If the air can be naturally introduced from the ground surface into the contaminated area 4 via the unsaturated air permeable layer 7 without forcedly injecting the air due to the shallowness, the air pressure input mechanism 5 may be omitted. Absent.

(Second Embodiment)

  Next, a second embodiment will be described. Note that components that are substantially the same as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

  FIG. 3 is a diagram showing a purification system for hardly air permeable and contaminated soil according to the second embodiment. As shown in the figure, the hardly permeable and air permeable contaminated soil purification system 41 according to the present embodiment includes a vibrator 42 as a vibrating body and an unsaturated permeable air that exists above the groundwater level located in the saturated layer 6. Of the water permeable layer 2, an air pressure injection mechanism 5 for forcibly injecting air into a polluted area 4 contaminated with a pollutant 3 such as oil, dioxins or volatile organic chlorine compounds, and the injected air is pollutant 3. And the gas treatment equipment 13 that performs the purification process by sucking the pollutant 3 together with air after the unsaturated air-permeable layer 7 is lifted, and the vibrator 42 is a contaminated region of the unsaturated air-permeable layer 2 4, and the vibration can be applied to the soil particles in the contaminated region 4 by driving the vibrator.

  Unsaturated hardly permeable air permeable layer 2 is made of soil mainly composed of silt, clay, or clay soil, and is poor in air permeability and water permeability. On the other hand, the unsaturated air permeable layer 7 is a soil layer made of sandy soil having air permeability.

  In order to install the purification system 41 for the hardly permeable and air permeable contaminated soil according to the present embodiment, first, the pneumatic injection mechanism 5 is placed in the contaminated region 4 of the unsaturated permeable and air permeable layer 2 that is contaminated with the contaminant. The press-in pipe 9 is installed.

  When the press-fit pipe 9 is installed, the corresponding position is bored in advance, and then the press-fit pipe 9 is inserted into the bore hole, and then the press-fit pipe 9 and the bore hole are prevented so that the air discharge port 8 is not blocked. In order to fix the press-fitting pipe 9 in between, a mortar, bentonite, etc. are filled in a space shallower than the air discharge port 8 in order to fix the press-fitting pipe 9.

  Next, an air tank 11 and an air compressor 12 are sequentially connected to the upper end of the press-fit pipe 9.

  Before and after the installation of the press-fitting pipe 9, an appropriate number of vibrators 42 are buried in the contaminated region 4 contaminated with the pollutant in the unsaturated hardly permeable air permeable layer 2, and the vibrators are not shown. Connect to the device.

  On the other hand, a suction pipe 14 is embedded in the unsaturated gas permeable layer 7 and a gas-liquid separation device 15 is connected to the suction pipe. Thereafter, as described above, the suction blower 16 and activated carbon are communicated with the gas phase space. The filter tank 17 is sequentially connected, and the water treatment facility 18 is connected so as to communicate with the liquid phase space.

  In order to purify the hardly permeable and air permeable contaminated soil, in this embodiment, the contaminated region 4 of the unsaturated permeable and permeable water permeable layer 2 using the purification system 41 thus installed, first, the vibrator 42 is driven. As a result, vibration is applied to the soil particles in the contaminated area 4 and air is pressed into the contaminated area 4 of the unsaturated hardly permeable air permeable layer 2 by appropriately operating the air compressor 12, the air tank 11 and the pressure vessel 10. To do.

  In this way, unlike the conventional air sparging method and bubble entrainment purification method, by applying vibration to the contaminated region 4 by the vibrator 42, soil particles in the contaminated region 4 of the unsaturated hardly permeable air permeable layer 2 are provided. The soil particles collide with each other to create a new gap between the soil particles, the gap becomes larger than the original size, the skeleton of the viscous soil is destroyed, and the soil particles rub against each other. Contaminants adhering to the surface are peeled off from the surface.

  For example, the skeleton of the viscous soil is broken by the driving operation of the vibrator 42, and the soil particles are separated, voids are newly generated, and the contaminant 3 attached to the surface of the soil particles is separated from the soil particles.

  Even when the skeleton is not destroyed, a new gap is generated by the driving operation of the vibrator 42, or the original gap is increased, and thus the air press-fitted through the press-fitting pipe 9 becomes soil particles. When flowing through the gaps between them, the flow resistance is greatly reduced and the flow is facilitated, and the contaminants 3 adhering to the soil particles are released in the gaps between the soil particles. It becomes easy to be taken.

  Next, after the injected air moves up the unsaturated air permeable layer 7 while entraining the pollutant 3, the pollutant 3 is sucked together with the air by the gas treatment facility 13 to perform a purification process. Suction is performed by operating the suction blower 16.

  Next, the sucked pollutant entrained air is separated into liquid and gas in the gas-liquid separation tank 15, and the gas is passed through the activated carbon filter tank 17 to adsorb the pollutant 3 on the activated carbon, and then released to the atmosphere. At the same time, for the liquid, the pollutant 3 is removed by the water treatment facility 18 and then discharged into a river or the like.

  Even in the case of the unsaturated air permeable layer 7, the substance to be sucked is not only gas but also moisture is sucked in some amounts depending on weather conditions such as rainfall, and therefore the gas-liquid separation tank 15 is interposed. Needless to say, it is desirable to install the water treatment facility 18.

  As described above, according to the purification method and system for hardly permeable and air permeable contaminated soil according to the present embodiment, the contaminated region 4 due to the vibrator 42 is different from the conventional air sparging method and bubble entrainment purification method. By applying vibration to the soil particles, the soil particles collide with each other, and a new gap is generated between the soil particles, the gap becomes larger than the original size, or the skeleton of the soil particles is destroyed. As a result of rubbing, the contaminant 3 adhering to the surface of the soil particles is peeled off from the surface.

  In such a state, when the injected air flows through the gaps between the soil particles, the flow resistance is greatly reduced, and the contaminant 3 attached to the soil particles is released into the gaps between the soil particles. Therefore, the contaminant 3 is also easily taken to the air.

  For this reason, if the injected air moves up the unsaturated air permeable layer 7 while entraining the pollutant 3 and then the contaminant 3 is sucked together with the air to perform the purification process, it is not possible with the conventional air sparging method or the like. It becomes possible to reliably and efficiently purify the unsaturated hardly permeable air permeable layer 2 that has been possible.

  In the present embodiment, air is forcibly pressed into the contaminated region 4 of the unsaturated hardly permeable air permeable layer 2 using the air pressure input mechanism 5. For example, the unsaturated hardly permeable air permeable layer 2 is relatively shallow. Therefore, the air pressure insertion mechanism 5 may be omitted as long as air can be naturally introduced from the ground surface into the contaminated region 4 through the unsaturated air permeable layer 7 without forcedly injecting air.

  Moreover, in this embodiment, although the suction pipe 14 was embed | buried horizontally in the unsaturated air permeable layer 7, when the unsaturated hardly permeable air permeable layer 2 is shallow, it replaces with this structure and is unsaturated unsaturated permeable air permeable water. An appropriate number of boreholes penetrating into the layer 2 may be excavated vertically from the ground, and suction pipes may be inserted into the respective boreholes.

  As a structure of the suction pipe inserted into such a vertically formed boring hole, for example, a suction hole is formed at one end of a hollow pipe and a mesh material for preventing clogging is wound around the suction hole. Then, the suction pipe may be installed so that the portion where the suction hole is formed penetrates into the unsaturated hardly permeable air permeable layer 2.

Schematic of the purification system of the hardly air permeable water-contaminated soil which concerns on 1st Embodiment. The schematic diagram which showed an example of the effect | action of the purification method of the hardly air permeable permeation | contamination soil which concerns on 1st Embodiment. Schematic of the purification system of the hardly air permeable water-contaminated soil which concerns on 2nd Embodiment.

Explanation of symbols

1,41 Purification system for poorly permeable and permeable contaminated soil 2 Unsaturated permeable and permeable layer 3 Pollutant 4 Contaminated area 5 Pneumatic insertion mechanism 7 Unsaturated permeable layer 9 Press-in pipe 10 Vibro hammer (vibrating body)
11 Air tank 12 Air compressor 13 Gas processing equipment 14 Suction pipe 15 Gas-liquid separation tank 16 Suction blower 17 Activated carbon filter tank (Toxic substance removal device)
18 Water treatment equipment 20 Steel sheet pile (vibrating body)
42 Vibrator

Claims (6)

A vibration body is embedded in a contaminated area contaminated with a pollutant in the unsaturated hardly permeable air permeation layer that exists above the groundwater level, and the soil particles in the contaminated area are vibrated by driving the vibration body. Impervious air permeation for giving a purification process by sucking the contaminants together with the air with a suction pipe provided above the contaminated area while entraining the pollutant into the air that is press-fitted into the contaminated area or naturally flows in A method for remediation of toxic soil,
A method for purifying hardly air-permeable and permeable contaminated soil, characterized in that the vibrator is composed of a pile or sheet pile whose lower end is buried in the contaminated area, and a vibro hammer attached to the upper end of the pile or sheet pile. A vibration body is embedded in a contaminated area contaminated with a pollutant in the unsaturated hardly permeable air permeation layer that exists above the groundwater level, and the soil particles in the contaminated area are vibrated by driving the vibration body. Impervious air permeation for giving a purification process by sucking the contaminants together with the air with a suction pipe provided above the contaminated area while entraining the pollutant into the air that is press-fitted into the contaminated area or naturally flows in A method for remediation of toxic soil,
A method for purifying hardly air-permeable and water-contaminated soil, wherein the vibrator is composed of a vibrator. Of the unsaturated hardly permeable air permeable layer existing above the groundwater level, the vibrator is embedded in a contaminated area contaminated with a contaminant and imparts vibration to soil particles in the contaminated area by a driving operation, and the contamination Non-breathable water-permeable contaminated soil comprising a gas treatment facility that performs a purification process by sucking a contaminant introduced into the area or naturally entrained air with a suction pipe provided above the contaminated area Purification system,
An air injection mechanism that pressurizes air into the contaminated area, and the air injection mechanism includes a press-fit pipe embedded in an air discharge port located in the contaminated area of the unsaturated hardly permeable air permeable layer; and an air tank A system for purifying hardly air-permeable and permeable contaminated soil, comprising an air compressor connected to the press-fitting pipe via Of the unsaturated hardly permeable air permeable layer existing above the groundwater level, the vibrator is embedded in a contaminated area contaminated with a contaminant and imparts vibration to soil particles in the contaminated area by a driving operation, and the contamination Non-breathable water-permeable contaminated soil comprising gas treatment equipment that performs a purification process by sucking a pollutant entrained in air that is press-fitted into the area or naturally flowing into the area with a suction pipe provided above the contaminated area Purification system,
A suction pipe embedded in the unsaturated hardly permeable air permeable layer or the unsaturated air permeable layer extending thereabove, a gas-liquid separation tank connected to the suction pipe, and the gas-liquid separation tank features of a suction blower, which is communicatively connected to the gas-phase space, and removing harmful substances device connected to the suction blower, by being configured and a connecting stub water treatment facility in the liquid phase space of the gas-liquid separation tank A system for purifying poorly air permeable and contaminated soil. 5. The hardly permeable and air permeable contaminated soil according to claim 3 , wherein the vibrating body is composed of a pile or a sheet pile whose lower end is embedded in the contaminated area and a vibro hammer attached to the upper end of the pile or sheet pile. Purification system. The system for purifying hardly permeable and air permeable contaminated soil according to claim 3 or 4, wherein the vibrator is composed of a vibrator.

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