JP4518504B2 - Contaminated soil purification method and equipment - Google Patents

Description

  The present invention relates to a technique for purifying contaminated soil. More specifically, the present invention is a technology that can move only the contaminated soil to the ground side without moving the uncontaminated soil to the ground side, and remove the pollutant from the contaminated soil ( In this specification, it is described as “in-situ purification technology”).

  In the conventional soil purification method, the contaminated soil in the area to be purified is often dug together with the uncontaminated area. In that case, the contaminated soil dug up is sent to the treatment facility, and the contaminated soil sent to the treatment facility is subjected to chemical treatment and physical treatment to remove the contaminant.

However, in such a method, there is a possibility that a pollutant in the contaminated soil, for example, a volatile substance (VOC) may diffuse into the surrounding environment at the stage of digging out the contaminated soil in the region to be purified.
Further, in this method, since soil in an uncontaminated area above the contaminated area must be dug up, a great amount of labor is required to dug up the contaminated soil and move it to the ground side.

Here, a technique has been proposed that makes it possible to cut the contaminated soil using a so-called cross jet, determine the construction area with high accuracy, and accurately grasp the quantity of the filling material (Patent Document 1).
However, the related art does not disclose contents related to the in-situ purification technology.
Moreover, nothing is disclosed about the treatment of the slime generated when cutting using the cross jet or the contaminants contained in the gas.
JP 2003-159584 A

  The present invention has been proposed in view of the above-mentioned problems of the prior art, and does not diffuse the pollutant into the surrounding environment, and removes and processes the pollutant in the vicinity of the area where the contaminated soil exists. The purpose of the present invention is to provide a contaminated soil purification method and apparatus.

  The contaminated soil purification method of the present invention includes the step (S1) of inserting the injection and injection device (2) into the borehole (H), and the injection and injection device (2) when pulling up the injection and injection device (2). A high-temperature fluid (for example, 80 ° C. to 90 ° C. water: or water vapor) of 80 ° C. to 90 ° C. is jetted from nozzles (221, 222) provided above the nozzle (jet Jc: for example, so-called “cross jet”) ), A step of injecting the filling material (C) from an injection port (21o) provided below the injection and injection device (2), and a step of injecting the filling material (C) (for example, by injecting a cross jet Jc) The process of removing pollutants by the purification equipment (4, 5, 6) provided on the ground side (E) for the slime (S) that has flowed out to the ground side (E) , Aerate slime (in slime aeration tanks 5 and 6) And the step of sucking and removing the contaminants which have been vaporized and separated from the slime (by the first VOC recovery device 11 and the second VOC recovery device 16), and in the aeration step, The slime is sprayed from the end (T2b) of the aeration tank (5) toward the space where the slime of the aeration tank (5) is not filled, and the slime in the aeration tank (5) is connected to the vicinity of the bottom of the aeration tank (5). The slime (Ys) and the high pressure air (Fa1) are supplied to the high pressure air injection pipe (151) where the slime circulation pipe (152) merges. And the mixed fluid (Jsa) is caused to collide with the vertical wall surface (52) of the aeration tank (5) (claim 1).

In the present invention, it is preferable to have a step of supplying the slime from which contaminants have been removed to the injection and injection device (2).
The slime supplied to the injection and injection device (2) after the contaminants are removed is preferably injected as a cutting fluid from the nozzles (221, 222) of the injection and injection device (2).
Alternatively, the slime supplied to the injection and injection device (2) after the contaminant has been removed is preferably injected as a filling material (C) from the injection port (21o) of the injection and injection device (2).

  In the present invention, it is preferable that the slime supplied to the aeration tank (5) through the slime transport pipe (T2) is heated by the heating device (14) provided in the slime transport pipe (T2). .

  The contaminated soil purification apparatus of the present invention includes an injection and injection device (2) inserted into a boring hole (H), a construction device (construction machine 101) for lifting the injection and injection device (2), and the ground side (E ) Equipped with purification equipment (4, 5, 6) for removing contaminants from the slime (S) that has flowed out and a sealing device (mouth tube 3, cover 3C) for sealing the ground side portion of the borehole (H), The injection and injection device (2) is provided with a nozzle (221, 222) provided above and an injection port (21o) provided below the injection and injection device (2), and a high temperature of 80 ° C. to 90 ° C. from the nozzle (221, 222). Are injected (jet Jc: for example, so-called "cross jet"), and the filling material (C) is injected from the injection port (21o). The purification equipment (4, 5, 6) Aeration of slime to separate contaminants And a pollutant recovery device (first VOC recovery device 11, second VOC recovery device 16) that sucks and removes the contaminants vaporized and separated from the slime, The aeration apparatus (5) includes an aeration tank (5), a slime conveyance pipe (T2) for supplying slime to the aeration tank (5), and a slime circulation apparatus (15), and the slime conveyance pipe (T2). The end portion (T2b) of the aeration tank (5) opens horizontally toward the space not filled with slime, and the slime circulation device (15) is connected to the vicinity of the bottom of the aeration tank (5). A slime circulation pipe (152) for sucking slime in the aeration tank (5), and a high-pressure air injection pipe (151) that joins the slime circulation pipe (152) and is supplied with high-pressure air (Fa1). Shi The high pressure air injection pipe (151) has a function of injecting the mixed fluid (Jsa) of the slime (Ys) and the high pressure air (Fa1) so as to collide with the vertical wall surface (52) of the aeration tank (5). It is characterized (claim 4).

In the present invention, it is preferable to have a supply device (concrete pump 8, slime transport pipe T6) for supplying slime from which contaminants have been removed to the injection and injection device (2).
Moreover, in this invention, it is preferable to have the piping heating apparatus (14) which heats slime to a slime conveyance pipe | tube (T2) (Claim 6).

Alternatively, in the present invention, a refrigerant tank (brine tank 161) through which the refrigerant (brine Lc) flows and a pollutant pipe (VOC pipe Lv) disposed in the refrigerant tank (161) The substance pipe (Lv) is refracted into a bent shape to form a heat exchanger, and a volatile substance recovery device (VOC) configured to flow through the volatile substance (VOC) ( It is preferable to have a VOC recovery device 16A).

According to the present invention having the above-described configuration, a jet (Jc) of high-temperature fluid is injected from nozzles (221, 222) provided above the injection and injection device (2), and the contaminated soil (Gp) is It is finely crushed by a high-energy jet (Jc) made of a high-temperature fluid (for example, water at 80 ° C. to 90 ° C. or water vapor). As a result, contaminants such as VOC attached to the soil (Gp) are separated or separated from the soil particles when the soil (Gp) is finely crushed by the synergistic effect of heat and kinetic energy of the high temperature fluid jet (Jc). As a result, it is eluted in the slime (S).
Alternatively, the pollutants separated or separated from the soil particles are vaporized by the thermal energy of the high temperature fluid jet and mixed with the air jetted with the cross jet.
And a pollutant moves to the ground side from the original position in soil as a slime is taken to flow out to the ground side (E) or as a mixed gas with air.

For example, when the soil particles are clay, the clay has an electric charge, and the electric charge is absorbed by the contaminant by the electric charge. Of course, the contaminants also adsorb on the surface of other soil particles. In this way, the contaminants adsorbed on the surface of the soil particles are difficult to elute into water. Alternatively, the soil particles themselves have a lattice-like structure, and when a contaminant such as VOC is taken into the lattice, it is difficult to elute to the outside.
According to the present invention, when the clay particles are shredded by a high temperature and high energy jet (Jc), the contaminants adsorbed on the surface of the soil particles, such as the contaminants electrically adsorbed on the clay particles, are It will be in the state which is easy to exfoliate or separate from the soil particle concerned. And if the lattice-like structure of soil particles is destroyed by a high-temperature and high-energy jet (Jc), the contaminants taken into the lattice will be easily separated from the soil particles.

As a result, according to the present invention, even contaminants that have been difficult to remove with the prior art, that is, contaminants adsorbed on soil particles or contaminants incorporated into the lattice structure of soil particles, are removed from the soil. It peels or separates and becomes a state eluted in the slime. Alternatively, the contaminants separated from the soil particles are vaporized and mixed with the air injected with the jet.
In the state of elution in the slime, for example, if the contaminant is VOC, the contaminant is easily and reliably removed from the slime (S) by the aeration apparatus (5, 6). In other words, it is easier to remove the contaminants eluted in the slime than the contaminants attached to the contaminated soil (Gp).
Further, the contaminants which are vaporized and mixed with the air, and the gas phase contaminants separated from the slime can be easily removed by being sucked by the contaminant recovery devices (11, 16).

  That is, according to the present invention having the above-described configuration, contaminants that have conventionally been difficult to remove can be eluted in the slime, or mixed in the gas and floated to the ground side. It can be reliably removed by the purification equipment (4, 5, 6, 7) provided on the ground (E) side.

  Therefore, it is possible to remove and peel off contaminants such as VOC from the soil (Gp) in the contaminated area without digging up all the soil located above the soil (Gp) in the contaminated area to the ground side. Therefore, labor required for remediation of contaminated soil as compared to the case where not only the soil (Gp) in the contaminated area but also all the soils located above the soil (Gp) in the contaminated area are moved to the ground (E) side. The cost can be kept very low.

Further, according to the present invention, since the sealing device (the mouth tube 3, the cover 3C) for sealing the ground side of the borehole (H) is provided, the slime that has eluted the pollutant and the gas containing the pollutant Are prevented from leaking out and contaminants are prevented from diffusing into the surroundings or penetrating underground.
At the same time, the slime or gas flowing out to the ground (E) side is purified by the purification equipment (4, 5, 6, 7) provided on the ground (E) side to remove the pollutants. The labor for transporting the entire amount of soil to the processing facility can be reduced. And it is also prevented that the pollutant diffuses from the contaminated soil during transportation.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
First, a first embodiment of the present invention will be described with reference to FIGS.
In FIG. 1, the entire contaminated soil purification system (soil purification system) is denoted by reference numeral 100.
The soil purification system 100 includes a construction machine 101, an excavator 1, a slime storage tank 4, a first slime aeration tank 5, and a second slime aeration tank 6.
The soil purification system 100 further includes a heavy metal removing device 7 and a concrete pump 8.

In FIG. 1 and FIG. 2, a state where a triple pipe rod 2 (described later) of the excavator 1 is inserted into a bored hole H that has already been drilled and a soil purification method is being constructed is shown.
In FIG. 1 and FIG. 2, symbol G indicates soil in general, and symbol Gp indicates contaminated soil or a contaminated area.

In particular, as shown in detail in FIG. 2, the excavator 1 includes a triple pipe rod 2. The triple tube rod 2 is configured such that the first tube 21, the second tube 22, and the third tube 23 are concentric. The 1st pipe | tube 21 is arrange | positioned radially innermost, and the 3rd pipe | tube 23 is arrange | positioned radially outermost.
1 and 2, a casing pipe CP is inserted into the bore hole H.

The filling material C is supplied into the first pipe 21. A filling material injection port 21o is formed near the tip of the first tube 21 (the lower end in FIG. 2).
As the filling material C, not only a normal solidified material but also purified slime can be used again as described in a second embodiment to be described later. Further, the purified slime can be reintroduced as a cutting fluid.

Nozzles 221 and 222 are provided in the second tube 22 and the third tube 23. The nozzles 221 and 222 are spaced apart in the vertical direction and are provided in pairs. Jet jets J1 and J2 ejected from the pair of nozzles 221 and 222 collide at a predetermined position Pjc (intersection) to form a so-called “cross jet” Jc.
Here, the casing pipe CP is disposed so as not to interfere with the cross jet Jc.
In FIG. 2, only a pair of nozzles 221 and 222 for injecting the cross jet Jc is shown, but a plurality of pairs of nozzles for injecting the cross jet Jc can be provided.

The jet jets J1 and J2 are preferably composed of high-pressure water having an ultrahigh pressure. And it is preferable that the temperature of high temperature water is the temperature which the water which is cutting fluid does not boil, for example, 80-90 degreeC.
In the triple tube rod 2 of FIG. 2, the devices in the region from the nozzles 221 and 222 to the filling material injection port 21o constitute a filling monitor 20 (injection and injection device).

In FIG. 2, the high temperature water jets J1 and J2 are surrounded by a jet Ja of high temperature compressed air. Although not shown in detail, the nozzles 221 and 222 are concentrically arranged, and the radially inner side communicates with the annular space between the first tube 21 and the second tube 22, and from the radially inner side. Hot water jets J1 and J2 are jetted. The outer sides in the radial direction of the nozzles 221 and 222 communicate with the annular space of the second pipe 22 and the third pipe 23, and the hot compressed air jet Ja is injected from the outer side in the radial direction.
The temperature of the jet Ja of compressed air is a temperature that does not vaporize the water constituting the jets J1 and J2. However, the compressed air jet Ja can be omitted.
Further, in the above-described content, in the triple tube rod 2, the filling material C flows through the first tube 21, the high-pressure hot water flows through the annular space between the first tube 21 and the second tube 22, and the high temperature The compressed air flows through the annular space between the second tube 22 and the third tube 23, but is not limited thereto. For example, the filling material C is supplied through the annular space of the second pipe 22 and the third pipe 23, the high-pressure hot water flows through the first pipe 21, and the high-temperature compressed air flows between the first pipe 21 and the second pipe 21. You may comprise so that it may be supplied through the annular space of this pipe | tube 22.

In FIG. 1, a triple tube swivel 9 is attached to the end of the triple tube rod 2 on the ground E side.
Although not shown, the triple tube swivel 9 is provided with a filling material supply port, an ultrahigh pressure water supply port, and a compressed air supply port. The first pipe 21 communicates with a filling material supply port (not shown). An annular space between the first pipe and the second pipe 22 communicates with an ultrahigh pressure water supply port (not shown). An annular space between the second tube 22 and the third tube 23 communicates with a compressed air supply port (not shown).

In FIG. 2, the triple tube rod 2 is covered with a mouth tube 3 in the vicinity of the ground surface Ef. A connection port 3 o is formed on the outer periphery of the mouth tube 3. Although not clearly shown, the connection port 3o communicates with the annular space K between the third pipe 23 and the casing pipe CP.
An annular space K between the third pipe 23 and the casing pipe CP serves as a discharge passage through which slime and / or gas floats to the ground side. In FIG. 2, an arrow S in the annular flow path K indicates the direction of the slime and / or gas flow.
One end T1a of the first slime transport pipe T1 is connected to the connection port 3o.

A cover 3 </ b> C is installed on the underground side of the mouth 3.
In the unlikely event that a slime containing harmful substances leaks from the mouth tube 3, a cover 3C is provided as a sealing means for preventing the leaked slime from scattering and spreading to the surroundings or penetrating underground. ing.
The mouth tube 3 and the cover 3C are connected by a known means such as a flange.

In FIG. 1, the end portion T <b> 1 b on the side separated from the mouth tube 3 of the first slime transport pipe T <b> 1 opens from the upper side to the lower side in the slime storage tank 4.
In the first slime transport pipe T1, a slime sample extraction device 10 is interposed in an area near the mouth tube 3.

  The slime sample extraction device 10 extracts a part of the slime discharged from the construction area to the ground side as a sample. The extracted slime is subjected to physical and chemical treatments necessary for analysis in an analysis system (not shown), and then analyzed for the concentrations of various pollutants contained in the slime, moisture content, and the like.

Instead of the slime sample extraction device 10, a gas sampling device may be provided in the vicinity of the end portion T1b on the slime storage tank 4 side of the first slime transport pipe T1.
Contaminants may elute into the slime, but may mix with the air of the compressed air jet Ja and come out to the ground. Then, the air constituting the compressed air jet Ja is also discharged from the first slime transport pipe T1, but vaporized contaminants, for example, vapor phase VOCs are intermittently ejected.
A gas sampling device (not shown) is installed in the vicinity of the end portion T1b of the first slime transport pipe T1, and the gas collected by sucking with a blower or the like (mixed gas of gas phase contaminants and air) ), It is possible to measure the pollutant concentration in real time.

  A first VOC recovery device 11 is disposed on the canopy 41 of the slime storage tank 4. The first VOC recovery device 11 has an adsorption device (not shown) containing an adsorbent such as activated carbon, and is configured to adsorb and collect contaminants such as VOC.

  The first VOC recovery device 11 communicates with the inside of the slime storage tank 4 by the first exhaust duct D1. A first blower 12 is interposed in the first exhaust duct D1. An end D1a on the tank 4 side in the first exhaust duct D1 is disposed in the vicinity of the other end T1b of the first slime transport pipe T1.

The slime S discharged from the first slime transport pipe T1 has already accumulated on the bottom 42 side of the slime storage tank 4 in FIG.
There is a drop between the end T1b of the first slime transport pipe T1 and the upper surface of the slime S stored in the slime storage tank 4. When the slime falls from the end T1b, the dropped slime collides with the stored slime S. By the collision, the soil (clay etc.) in the slime is finely crushed. If the clay is finely crushed and atomized, contaminants such as VOC associated with the clay are easily separated.

The slime storage tank 4 and the first slime aeration tank 5 communicate with each other through a second slime transport pipe T2. A first transport pump P1 is interposed at the end of the second slime transport pipe T2 on the slime storage tank 4 side.
The slime S in the slime storage tank 4 is sucked from the suction port P1a of the first transfer pump P1.

A high-rotation type (for example, rotation speed 3000 rpm) mixer 13 is interposed in the second slime transport pipe T2.
Since clay lumps are mixed in the slime flowing through the second slime transport pipe T2, a high-speed mixer is provided by interposing the high-speed mixer 13 in the second slime transport pipe T2. The clay lump in the slime is crushed by 13 and atomized.
If the clay lump in the slime is atomized, the VOCs in the slime can be easily separated by the aeration process in the first slime aeration tank 5 and the second slime aeration tank 6.

In the second slime transport pipe T <b> 2, a pipe heating device 14 is interposed in a region between the high rotation type mixer 13 and the first slime aeration tank 5.
The pipe heating device 14 will be described with reference to FIGS.

In FIG. 3, the pipe heating device 14 includes a heating wire 141 and a chemical solution addition pipe 142. The heating wire 141 spirally surrounds the second slime transport pipe T2. The heating wire 141 is connected to a power source (not shown) and heats to a room temperature or higher. For example, it is possible to heat to about 130 ° C.
3 and 5, the arrow Y indicates the direction in which the slime S flows.

In FIG. 4, one end 142a of the chemical solution addition pipe 142 communicates with the second slime transport pipe T2 at the top Tt of the second slime transport pipe T2. The other end 142 b of the chemical solution addition pipe 142 is connected to the chemical solution supply source B.
The chemical solution supply source B uses a publicly known and commercially available device, and stores, for example, a flocculant, a neutralizing agent, a drug having an action of weakening the binding force between clay particles in the slime, and the like.
For example, in response to a slime analysis result in an analyzer (not shown), a necessary chemical solution is supplied from the chemical solution supply source B via the chemical solution addition pipe 142 to the second slime transport pipe T2, and the second slime. It is appropriately added to the slime S flowing inside the transport pipe T2.

4 and 5, an in-line mixer 143 is installed inside the area where the heating wire 141 is wound in the second slime transport pipe T2.
The in-line mixer 143 disposed inside the pipe heating device 14 is configured to be rotationally driven by, for example, an ultra-small motor (not shown).
The in-line mixer 143 has one rotating shaft 144, a plurality of (eight in FIG. 5) blades 145, and a micro motor (not shown).
The plurality of blades 145 are fixed to the rotating shaft 144 at equal intervals. The rotating shaft 144 is connected to a rotating shaft of a micro motor (not shown) by a connecting member (not shown).

In FIG. 5, the chemical solution addition pipe 142 communicates with the second slime transport pipe T2 at the center in the longitudinal direction of the in-line mixer 143. Although not shown, the chemical solution addition pipe 142 can be connected to the second slime transport pipe T2 in the vicinity of the left end of the in-line mixer 143.
If the chemical addition pipe 142 is connected to the second slime transport pipe T2 near the left end of the inline mixer 143, the added chemical and slime S are sufficiently stirred by all the blades 145 of the inline mixer 143. .

Even the slime S passing through the center of the cross section of the second slime transport pipe T2, for example, by the in-line mixer 143 is sufficiently agitated and mixed with the chemical solution, and the action of the chemical solution (for example, promoting the decomposition reaction of contaminants) ) Is achieved.
Further, if the slime is heated by the heating wire 141, the separation of the slime and the contaminant (for example, VOC) is promoted.

  That is, according to the pipe heating device 14 shown in FIGS. 3 to 5, the slime flowing through the second slime transport pipe T <b> 2 is sufficiently stirred by the in-line mixer 143, and the chemical solution added via the chemical solution addition pipe 142 Thoroughly mixed and heated uniformly by heating wire 141. As a result, the VOC separation by the aeration process in the slime aeration tank 5 on the downstream side is promoted.

In FIG. 1, an end T2b on the side of the aeration tank 5 in the second slime transport pipe T2 is open in the horizontal direction above the inside of the first aeration tank 5.
In the first aeration tank 5, a slime circulation injection device 15 is installed above the vertical wall surface 51. The slime circulation injection device 15 is configured to inject in the horizontal direction.
The structure of the slime circulation injection device 15 will be described later with reference to FIGS.

The mixed flow (symbol Jsa in FIGS. 8 and 9) of the slime and air injected from the slime circulation injection device 15 travels straight and collides with the vertical wall 52 after the injection.
The slime flowing through the second slime transport pipe T2 is pressurized by the first slime pump P1, and the slime sprayed in the horizontal direction from the end T2b of the second slime transport pipe 2T also goes straight. Collides with the vertical wall surface 52.

Even if a clay lump is included in the slime, it is atomized by colliding with the vertical wall 52, and the VOC gas is easily separated.
The separated VOC gas is recovered by the second VOC recovery device 16 via the second exhaust duct D2. In the canopy 53 of the first slime aeration tank 5, the opening D2b of the second exhaust duct D2 is located in the vicinity of the vertical wall surface 52.

The slime sprayed in the horizontal direction from the end portion T2b of the second slime transport pipe 2T may not collide with the vertical wall surface 52. It is important that the slime is sprayed into the air.
By injecting the slime into the air instead of in the slime S stored at the bottom of the aeration tank 5, there are many opportunities for the soil particles or VOC in the slime to come into contact with the air, and the time for contact with the air becomes longer. Therefore, the aeration effect is improved.

In the first slime aeration tank 5, the end portion T2b of the second slime conveyance pipe T2 is joined to the slime circulation injection device 15, and the end portion T2b of the second slime conveyance pipe T2 and the slime circulation injection device 15 are connected. The same piping can be used.
The first slime aeration tank 5 and the second slime aeration tank 6 communicate with each other through a third slime transport pipe T3.
In the 3rd slime conveyance pipe T3, the 2nd conveyance pump P2 is interposed in the edge part by the side of the 1st slime aeration tank 5 side. The slime S in the first slime aeration tank 5 is sucked from the suction port P2a of the second transport pump P2 and sent to the second slime aeration tank 6.

A second VOC recovery device 16 is disposed on the canopy 61 of the second slime aeration tank 6.
The second VOC recovery device 16 has an adsorption layer made of an adsorbent such as activated carbon or zeolite (not shown), and is configured to adsorb and collect contaminants by the adsorption layer.

Instead of the VOC recovery device 16 having an adsorbing layer, a refrigeration-type VOC concentration recovery device 16A can be used as described later with reference to FIG.
Unlike the VOC recovery device 16 shown in FIG. 1, the VOC recovery device 16A according to the modification shown in FIGS. 6 and 7 is configured as a refrigeration concentration type.
In FIG. 6, the VOC recovery device indicated by the reference numeral 16 </ b> A as a whole has a rectangular parallelepiped box-shaped brine tank (refrigerant tank) 161. A brine (refrigerant) inlet 162 and a brine outlet 163 are formed in the brine tank 161.
In the brine tank 161, the surface on the side where the brine inlet 162 is provided is denoted by reference numeral 161a, and the surface on the side where the brine outlet 163 is present is denoted by reference numeral 161b.

In the brine tank 161, a VOC pipe Lv is arranged. The VOC piping Lv is bent in a zigzag manner to form a heat exchanger.
As shown in FIG. 7, the VOC pipe Lv is composed of a plurality of pipes and connecting members that connect the pipes.

In FIG. 7, the VOC pipe Lv includes a pipe Li on the side where the VOC flows and a pipe Lo on the side where the VOC is discharged.
The VOC inflow side tube Li and the VOC discharge side tube Lo penetrate the surface 161 a, and their ends are disposed outside the brine tank 161.

Inside the brine tank 161, the tube Li on the inflow side of the VOC is connected to a tube (straight tube) L1 through a U-shaped connecting tube Lu. The pipe L1 is connected to a pipe (straight pipe) L2 via a U-shaped connecting pipe Lu. Similarly, pipes (straight pipes) L1 to L5 are connected.
The tube L5 is connected to a tube (straight tube) L6 via a U-shaped connecting tube Lr having a large polar radius. The tube L6 is connected to a tube (straight tube) L7 through a U-shaped connecting tube Lu. Similarly, the pipes L6 to L10 are connected.
The pipe (straight pipe) L10 is connected to a pipe Lo on the VOC discharge side via a U-shaped connecting pipe Lu.

Gaseous VOC (symbol V1) flows into the brine tank 161 from the pipe Li on the inflow side, and passes through the VOC piping Lv (Li to Lo) in the brine tank 161. When the gaseous VOC flows through the VOC pipe Lv in the brine tank 161, the gaseous VOC exchanges heat with the refrigerant (brine) Lc flowing through the brine tank 161 and is cooled.
The cooled “VOC gas and moisture in the gas phase” become “liquid phase VOC and liquid phase moisture” (arrow V2), and are discharged out of the brine tank 161. Since partly gaseous VOC is also dehumidified, it can be easily adsorbed and recovered by activated carbon or the like. Further, “liquid phase VOC and liquid phase moisture” (V2) are processed by a known means.

6 and 7, both ends of the VOC inflow side tube Li and the VOC discharge side tube Lo are provided on the surface 161a side, but one is provided on the surface 161a side and the other is provided on the other side. You may provide in the surface 161b side.
Alternatively, the VOC inflow side tube Li may be made to penetrate the surface 161b, and the VOC discharge side tube Lo may be made to penetrate to the surface 161a side.

  According to the VOC recovery device 16A shown in FIGS. 6 and 7, since the VOC is discharged in the liquid phase, the labor for transporting to a known processing means can be reduced, and the entire processing cost can be reduced.

The second VOC recovery device 16 communicates with the upper portion of the first slime aeration tank 5 by the second exhaust duct D2. A second blower 17 is interposed in the second exhaust duct D2.
The second exhaust duct D2 branches to the third exhaust duct D3 at the branch point Pd. The third exhaust duct D3 communicates with the upper side of the second slime aeration tank 6.

There is a drop between the end T3b of the third slime transport pipe T3 and the upper surface of the slime S stored in the second slime aeration tank 6, and if the slime falls from the end T3b, It collides with the slime S stored in the tank 6.
By colliding, the solid content contained in the slime is atomized, and the contaminant contained in the slime is easily separated.
Here, the second slime pump P2 interposed in the third slime transport pipe T3 has a large impact when the transported slime collides with the slime in the tank 6 in addition to the slime transport function. It also has a function to

The bottom 62 of the second aeration tank 6 is equipped with an electrophoretic heavy metal recovery device 18.
The heavy metal recovery device 18 includes a cathode 18a, an anode 18b, and an electrode line Le connected to both electrodes.

By energizing the electrode line Le, heavy metals dissolved in the slime S or other ionized contaminants adhere to either the cathode 18a or the anode 18b.
If a certain amount of heavy metal or other ionized contaminants adheres to the electrodes 18a, 18b, the electrodes 18a, 18b are replaced. Then, heavy metals or other ionized contaminants are removed from the electrodes 18a and 18b removed from the second aeration tank 6.
Note that heavy metals and other contaminants that could not be removed by the heavy metal recovery device 18 are discharged from the fourth slime transport pipe T4.

The first slime aeration tank 5 may be equipped with stirring means such as a mixer M, as will be described later with reference to FIG.
In the first slime aeration tank 5, the internal slime is more active than the second slime aeration tank 6. On the other hand, in the second slime aeration tank 6, the flow of the slime S inside the tank is not so much.
Here, separation of heavy metals by electrophoresis can be more efficiently performed in a non-flowing state. Therefore, the second slime aeration tank 6 is in a state in which electrophoresis is easy. Therefore, heavy metals are separated by electrophoresis in the second slime aeration tank 6 on the downstream side.

A fourth slime transport pipe T4 is connected to the second slime aeration tank 6. In the 4th slime conveyance pipe T4, the 3rd pump P3 is interposed in the edge part by the side of the 2nd slime aeration tank 6 side.
The slime S in the second slime aeration tank 6 is sucked from the suction port P3a of the third transfer pump P3.
In the fourth slime transport pipe T4, an end T4b on the side separated from the second slime aeration tank 6 is opened above the hopper 19.

A first three-way valve V31 is interposed in the middle of the fourth slime transport pipe T4. A branch pipe TB branches from the first three-way valve V31, and an end of the branch pipe TB is a slime discharge port TBb.
In the fourth slime transport pipe T4, a second three-way valve V32 is interposed in a region between the three-way valve V31 and the end T4b. A branch pipe T40 branches from the second three-way valve V32.
The branch pipe T40 communicates with the heavy metal removing device 7. A slime discharge pipe T41 is connected to the heavy metal removing device 7, and the slime discharge pipe T41 opens above the hopper 19.

  The heavy metal removing device 7 heats and supplies VOC, heavy metal, PCB, and the like from the slime by heating supplied through the fourth slime transport pipe T4 and the branch pipe T40. The slime from which heavy metals and PCB have been decomposed and removed, and the contaminants have been completely removed, is introduced into the hopper 19 through the slime discharge pipe T41.

  When it is known that the soil in the construction area is not contaminated with heavy metals, PCBs, etc., and the purified slime does not need to be recycled (as cutting fluid or filling material) or is recycled When it is desired to decrease the amount, the first three-way valve V31 is operated to open the outlet TBb side of the branch pipe TB. The slime processed in the second slime aeration tank 6 is transferred from the discharge port TBb of the branch pipe TB to an industrial waste treatment facility (not shown) by transfer means such as the industrial waste transfer vehicle 20.

The first three-way valve V31 closes the branch pipe TB side when recycling the entire amount of processed slime flowing through the fourth slime transport pipe T4 as a cutting fluid or filler, and removes the heavy metal removing device 7 and / Or open the hopper 19 side.
When the entire amount of processed slime is transported to an industrial waste treatment facility (not shown), the heavy metal removing device 7 and / or the hopper 19 side of the first three-way valve V31 is closed, and the branch pipe TB side is opened. .
When part of the processed slime flowing through the fourth slime transport pipe T4 is recycled and the rest is transported to an industrial waste treatment facility (not shown), the heavy metal removing device 7 of the first three-way valve V31 and / or The hopper 19 side is opened by an opening corresponding to the recycling amount, and the branch pipe TB side is opened by an opening corresponding to the amount conveyed to an industrial waste treatment facility (not shown).

The hopper 19 is connected to the concrete pump 8 via the fifth slime transport pipe T5. The slime put into the hopper 19 flows through the fifth slime transport pipe T5 and is sucked into the concrete pump 8.
The concrete pump 8 is connected to the purified triple pipe swivel 9 through the sixth slime transport pipe T6.

By operating the concrete pump 8, the slime from which contaminants have been removed (the slime recycled as the cutting fluid or filling material) is supplied again to the triple pipe rod 2 via the triple pipe swivel 9. That is, the slime for recycling is injected as a filling material C from the filling material injection port 21o of the first pipe 21 into the region where the purification method is applied. Alternatively, (the recycling slime) is ejected from the nozzles 221 and 222 of the triple tube rod 2 as a cutting fluid.
When the viscosity of the slime for recycling is high or the moisture content of the slime is high, a solidifying material or other chemicals may be added as appropriate according to the properties of the recycling slime.

  Immediately after the construction of the contaminated soil purification method, no slime for recycling is generated. In that case, a separately prepared solidifying material, for example, cement milk, is put into the hopper 19. The charged cement milk is sent to the triple pipe rod 2 by the concrete pump 8 and injected as a filling material C in the construction area of the soil purification method.

With reference to FIG. 8, FIG. 9, schematic structure of the slime circulation injection apparatus 15 is demonstrated. As described with reference to FIG. 1, the slime circulation injection device 15 is provided in the first slime aeration tank 5.
8 and 9, the slime circulation injection device 15 includes a high-pressure air injection pipe 151 and two slime circulation pipes 152. A slime pump 154 is interposed in each of the two slime circulation lines 152.

The two slime circulation pipelines 15 merge with each other between the high-pressure air injections 151. The other ends of the two slime circulation lines 152 communicate with the vicinity of the bottom of the first slime aeration tank 5, respectively.
An air introduction port 152c is formed in the vicinity of a portion (cross junction) Px where the slime circulation pipe line 152 joins the high pressure air injection pipe 151. The air inlet 152c is configured as a suction pipe.

By reducing the cross-sectional area of the flow path in the area where the air inlet 152c of the slime circulation line 152 is formed and increasing the flow velocity, negative pressure is generated in the flow path in the slime circulation line 152. Due to the negative pressure, air (outside air) is sucked into the slime circulation conduit 152 from the air inlet 152c.
Note that high-pressure air can be fed into the air inlet 152c from, for example, a compressor (not shown). Or it is also possible to send the iron powder, chemical | medical agent, etc. which have a purification effect | action through the air inlet 152c.

  When the slime circulation injection device 15 is operated, the high-pressure air injection pipe 151 is supplied with high-pressure air Fa1 from high-pressure air generation means (compressor or the like) (not shown). At the same time, the slime pump 154 is also operated. The slime pump 154 causes the slime in the first slime aeration tank 5 to flow in the two slime circulation pipes 152 (arrow Ys), and joins the high pressure air injection pipe 151 at the cross junction Px.

  A mixed fluid Jsa of high-pressure air Fa1 and slime Ys is injected at high speed from the end of the high-pressure air injection pipe 151 on the aeration tank 5 side. The mixed fluid Jsa ejected at high speed collides with the vertical wall surface 52 on the front. The clay in the slime is atomized by the collision. The atomization of clay promotes the gasification of VOC in the slime.

Here, the slime sprayed in the horizontal direction from the end portion T2b of the second slime transport pipe 2T may not collide with the vertical wall surface 52. In other words, it is important that the slime sprayed from the end portion T2b of the slime transport pipe 2T is sprayed toward the space in the aeration tank 5 where the slime is not filled.
By injecting slime into such a space, the opportunity for the soil particles or VOC in the slime to come into contact with air is increased, and the time for contact with air is increased, so the aeration effect is improved.

  Mixing the slime S flowing through the slime circulation line 152 with the air from the air introduction port 152c and the high-pressure air Fa1 flowing through the high-pressure air injection pipe 151 also provides an aeration effect and promotes VOC gasification. The

A first modification of the first slime aeration tank 5 will be described with reference to FIG.
10, the slime aeration tank 5A according to the first modified example has a bottom portion 54 that is inclined so that the center is lowered in the left-right direction in FIG. Specifically, a flat portion 54h that is further deeper than the inclined surface is formed at the center of the bottom portion 54 of the slime aeration tank 5A.

The inclined bottom portion 54 is equipped with a plurality of mixers M. One mixer M is also provided in the flat portion 54h at the bottom center.
The slime aeration tank 5A includes a slime circulation injection device 15A similar to the slime circulation injection device 15 described with reference to FIGS.
In the slime aeration tank 5A, the stored slime S is always kept agitated by the plurality of mixers M, and the slime S reliably circulates in the tank 5A.

Next, a second modification of the first slime aeration tank will be described with reference to FIG.
In FIG. 11, the slime aeration tank 5B according to the second modified example is configured to inject the slime jet Js and the high-pressure air jet Ja in the vertical direction upward in the adjacent state. .

Since the slime jet Js and the high-pressure air jet Ja are intermingled both when rising and falling, it takes a long time for the slime to come into contact (impact) with the high-pressure air. Therefore, the aeration action with respect to the slime is good, and the gasification of the VOC contained in the slime is promoted.
The slime aeration tank 5B according to the second modification is effective when the contaminant concentration of the slime is high.
Here, the slime jet Js and / or the high-pressure air jet Ja can also be constituted by cross jets.
Since the slime aeration tank 5B according to the second modification uses a silo tank, the sealing performance is high and the soundproofing effect is also high.

With reference to FIG. 12, the 3rd modification of a 1st slime aeration tank is demonstrated.
In FIG. 12, in the slime aeration tank 5C according to the third modification, a plurality of high-pressure air jets Ja are injected from the lower side to the upper side of the slime aeration tank 5C. A plurality of slime jets Js are sprayed from the upper side to the lower side of the slime aeration tank 5C.

  Since the slime jet Js and the high-pressure air jet Ja are sprayed opposite each other, there is a high probability that the slime jet Js will collide with the high-pressure air jet Ja, and the opportunity and time for the slime to be exposed to the high-pressure air are increased. Thus, the aeration effect is exhibited well. Therefore, the generation efficiency of VOC gas is improved.

  The horizontally arranged slime injection pipe Ts and the high-pressure air injection pipe Ta can also be configured to rotate in opposite directions (rotation in the direction of arrow R1 and rotation in the direction of arrow R2). . If the jets Js and Ja are configured to rotate in directions opposite to each other, the probability of collision between the slime and the high-pressure air is further increased, and the opportunity and time for the slime to be exposed to the high-pressure air are further increased. As a result, the aeration effect is further improved and the generation efficiency of VOC gas is further improved.

With reference to FIG. 13, the 4th modification of a 1st slime aeration tank is demonstrated.
In the slime aeration tank 5D according to the fourth modification, the horizontal air pipe Ta in the third modification of FIG. 12 is omitted, and one high-pressure air nozzle Na is provided instead.
The high-pressure air nozzle Na is configured to generate a cyclonic air flow Fa in the tank 50. The swirl direction of the air flow Fa is opposite to the arrow R in FIG. On the other hand, the slime tube Ts rotates in the arrow R direction, which is the reverse direction of the swirl direction of the air flow Fa.
According to the fourth modification, the slime jet Js and the cyclonic air flow Fa collide suitably, the aeration effect is improved, and the VOC separation is promoted.

A fifth modified example of the first slime aeration tank will be described with reference to FIGS.
14 and 15, in the first slime aeration tank 5E according to the fifth modification, a cyclonic air flow Fa directed upward is formed by the high-pressure air injection nozzle Na provided at the bottom. A mixed jet injection device Nx is disposed above the tank. The mixed jet injection device Nx has a plurality of nozzles and extends in the horizontal direction. A composite jet Fx of slime and high-pressure air is injected from a plurality of nozzles of the mixed jet injection device Nx.
The composite jet Fx and the cyclonic air flow Fa collide suitably, the slime is well aerated, and the separation of the VOC contained in the slime is promoted.

According to the purification method using the contaminated soil purification system described with reference to FIG. 1 to FIG. 15, the contaminated soil Gp uses high-temperature (for example, 80 ° C. to 90 ° C.) water to cross high pressure and high energy. It is crushed finely by the jet Jc.
As a result, contaminants such as VOC attached to the soil Gp are peeled and removed from the soil particles by the synergistic action of heat and kinetic energy of the cross jet Jc, and are eluted into the slime. Then, the slime is taken to flow to the ground side E and can be moved from the original position to the ground side. Alternatively, the contaminants removed from the soil particles are mixed with the jet of high-pressure air jetted together with the cross jet Jc and float to the ground side.

When the soil particles are clay, the contaminants are electrically adsorbed due to the charge of the clay, but the clay particles are shredded by the high-temperature, high-energy cross jet Jc, so that the clay particles are electrically Contaminants adsorbed on the particles are also peeled off and removed from the clay particles. Similarly, contaminants adsorbed on the surface of other soil particles are separated from the surface of the soil particles by chopping the clay particles with a high temperature and high energy cross jet Jc.
Also, the contaminants taken into the lattice structure of the soil particles are separated from the soil particles because the lattice structure is destroyed by the high temperature and high energy cross jet Jc.
As a result, according to the embodiment of FIGS. 1 to 15, even if it is a contaminant contained in clay, which was difficult to remove by the prior art, or a contaminant incorporated in the lattice structure of soil. It can be easily peeled off and removed from clay or soil particles.

According to the embodiment of FIGS. 1 to 15, contaminants that have been difficult to remove with the prior art are also peeled off and removed from clay and soil particles and eluted into the slime or spilled out from the borehole H. It will be in the state mixed with gas.
If the elution is in the slime, the slime storage tank 4 and the first VOC recovery device, the first slime aeration tank 5 and the second aeration tank 6, the second VOC recovery device 17, and the aeration tank 6 Contaminants are easily and reliably removed from the slime by the electrophoretic heavy metal recovery device 18 and the heavy metal removal device 7.
Moreover, if the contaminant is mixed with the gas, it can be easily collected by suction before the gas diffuses into the atmosphere.

In the embodiment described with reference to FIGS. 1 to 15, the slime from which contaminants have been removed is injected as a cutting fluid from a pair of nozzles 221 and 222 of the triple tube rod 2 of the excavator 1 and / or triple tube. The filling material C is injected from the injection port 21o of the rod 2.
The slime from which the pollutants have been removed does not contain the pollutants, and no problem occurs even if the slime is backfilled in place. Further, the amount of slime to be treated as industrial waste is reduced by the amount used as the cutting fluid and / or the filling material C, and the cost necessary for the purification of contaminated soil is reduced by the amount that the cost of industrial waste treatment is reduced. Can be kept low.

Here, as described above with reference to FIGS. 1 and 2, the soil particles are shredded by the high temperature and high energy cross jet Jc, so that the soil particles are like the contaminants electrically adsorbed to the clay particles. Contaminants adsorbed on the surface peel off from the soil particles. Alternatively, the lattice-like structure of the soil particles is destroyed by the high temperature and high energy cross jet, and the contaminants trapped inside the lattice are easily eluted.
In the conventional measurement of pollutant concentration, it is difficult to measure the pollutant such as VOC which is taken into the soil particles of the contaminated soil or is electrically adsorbed. . In other words, in the prior art, pollutants such as VOCs that are taken into or adsorbed on the soil particles of the contaminated soil are not separated from the soil particles and are difficult to elute into water, and therefore can be measured. It was difficult.
On the other hand, according to the above-described embodiment, the lattice structure of the soil particles is destroyed by the high temperature and high energy cross jet Jc, and the contaminants adsorbed on the surface of the soil particles are separated or separated. Contaminants that could not be detected by technology become measurable. Therefore, compared with the conventional measuring method, the substance of the contaminated soil is measured more accurately.

Next, a second embodiment of the present invention will be described with reference to the flowchart of FIG. 16 and FIGS.
In FIG. 1 and FIG. 2, the boring hole H is drilled to the lowest layer of the contaminated soil Gp. Then, the triple tube rod 2 of the excavator 1 is inserted into the drilled bore hole H. At the time of construction, the simultaneous filling monitor 20 which is the tip portion including the nozzles 221 and 221 and the filling material injection port 21o of the triple tube 2 is rotated while being pulled upward.

Here, the construction area is cut and chopped by the cross jet Jc, the filling material C is injected into the entire construction area, the triple tube rod 2 is inserted again, and the cutting and chopping by the cross jet Jc and the filling material C are inserted. It is possible to repeat the injection.
In step S1 of FIG. 16, excavation and filling material are premised on the assumption that cutting, shredding, and injection of the filling material C by the cross jet Jc are repeated (constructed) a plurality of times. C implantation is performed substantially simultaneously.

In the cutting and shredding by the cross jet Jc, as described above with reference to FIGS. 1 and 2, the hot water jets J1 and J2 are jetted from the nozzles 221 and 222 of the triple tube rod 2 to form the cross jet Jc. And the area | region (construction area | region) of a predetermined | prescribed radial direction dimension is cut and shredded by the cross jet Jc comprised with the hot water jet.
Here, the hot water jets J1 and J2 can be surrounded by a high-pressure air jet Ja and injected.

In the construction area cut and shredded by the cross jet Jc, the internal pressure rises by injecting a high-pressure fluid into a certain area. The slime is automatically discharged from the flow path K of the triple pipe rod 2 to the slime storage tank 4 via the first slime transfer pipe T1 by increasing the internal pressure of the excavated construction area where the slime is generated. Is done. Contaminants are eluted in the slime.
In the case of injecting the high-pressure air jet Ja, the contaminants separated from the soil particles, the gas phase contaminants are mixed with the air of the high-pressure air jet Ja, and are mixed into the slime storage tank 4. Discharged.

Filling material C is injected from the filling material injection port 21o into the construction area excavated and muddy.
Since no slime for recycling is generated at the beginning of excavation, for example, cement milk supplied separately is injected from the concrete pump 8 as a filling material.

  As described above, the slime generated in the construction area flows into the slime storage tank 4 via the first slime transport pipe T1. A part of the slime flowing through the first slime transport pipe T1 is sampled (sampled) by the slime sample extraction device 10, and the concentration of contaminants in the slime is measured by an analysis facility (not shown). 16: Step S2).

The slime sample is analyzed to determine whether or not the contaminant concentration in the slime is greater than or equal to a threshold (step S3). Here, the threshold value is set as a boundary value indicating whether or not to replace the entire amount of soil in the contaminated area (so-called “total amount replacement”).
When the contaminant concentration is equal to or higher than the threshold value (YES in step S3), a filling material having a large specific gravity is used in the second construction (step S4).
When the pollutant concentration is equal to or higher than the threshold (YES in step S3), when the slime from which the pollutant has been removed is reused as the filling material C, the pollutant concentration is repeated many times until the pollutant concentration falls below the environmental standard value. Therefore, there is a possibility that the cutting by the cross jet Jc and the injection of the filling material C must be repeated.

Therefore, when the contaminant concentration is equal to or higher than the threshold value (YES in step S3), a filling material having a large specific gravity is newly filled without reusing the slime from which the contaminant has been removed as the filling material C (step S4). ). Then, the contaminated soil in the construction area is completely replaced by the filling material having a large specific gravity.
In the second construction, if the contaminated soil in the construction area is completely replaced by the filling material having a large specific gravity, it is not necessary to repeat the cutting by the cross jet Jc and the injection of the filling material C in the construction area.

If the contaminant concentration is less than the threshold value in step S3 (NO in step S3), the process proceeds to step S5.
As in the first embodiment of FIGS. 1 to 15, the slime that has flowed into the slime storage tank 4 passes through the second slime transport pipe T <b> 2 in which the high-rotation mixer 13 and the pipe heating device 14 are interposed. Then, it is sent to the first slime aeration tank 5 and aerated. Then, in the second slime aeration tank 6, heavy metal and ionized contaminants are removed by the heavy metal recovery device 18.
Furthermore, the slime passes through the heavy metal processing device 7 as necessary, and the contaminants are completely removed. The slime from which the pollutants have been removed (processed slime) is sent to the excavator 1 as a filling material C or a cutting fluid via the concrete pump 8.

In step S5 of FIG. 16, the contaminated soil is cut by the cross jet Jc or the filling material C is injected, and the generated slime is purified by the treatment system shown in FIG. Or the cycle until it is again sent to the excavator 1 as a cutting fluid is executed.
When the cycle of step S5 is executed, the slime sample extraction device 10 extracts a slime sample (sample). And the extracted slime sample is analyzed and the density | concentration of the contaminant in slime is measured (step S6).

Based on the measured data, it is determined whether or not the pollutant concentration in the slime is below a predetermined value, for example, an environmental reference value (step S7).
If the pollutant concentration is less than or equal to the environmental reference value (YES in step S7), the purification process is terminated.
If the pollutant concentration exceeds the environmental standard value (NO in step S7), step S5 and subsequent steps are repeated.

In 2nd Embodiment of FIG. 16, the sample slime is extracted with the slime sample extraction apparatus 10, and the contaminant density | concentration in the slime which flowed out to the ground side is measured. By this contaminant concentration in the slime, the contamination concentration in the underground purification method construction area can be grasped roughly in real time.
Therefore, it is possible to grasp the contamination concentration in the purification method construction area roughly in real time, and determine whether to reuse the slime as a cutting fluid or a filling material. Therefore, if the slime is reused as a cutting fluid or a filling material, if the number of repetitions of the cycle described in step S5 is excessive, the slime is not reused, as shown in step S4. Construction costs can be saved by using large filling materials.

  In addition, since the contamination concentration in the purification method construction area can be grasped roughly in real time and it can be accurately determined whether or not the cycle described in step S5 needs to be repeated, unnecessary work (cutting, Construction cost can be saved without performing filling (reuse in excavator 1).

It should be noted that the illustrated embodiment is merely an example, and does not limit the technical scope of the present invention.
For example, in the illustrated embodiment, the cutting fluid jet constitutes a cross jet, but the cutting fluid jet may be jetted as it is, for example, in the horizontal direction without intersecting.
In the illustrated embodiment, the monitor 10 is pulled up while rotating to cut and fill the columnar contaminated soil region. However, the monitor 10 is pulled up while being swung by a predetermined angle without rotating. Thus, a panel-like contaminated soil region having a predetermined width may be cut and filled.

The figure which shows the whole structure of the system which constructs 1st Embodiment of this invention. The figure which showed the excavator periphery in FIG. 1 in detail. The perspective view of the piping heating apparatus used by 1st Embodiment. Sectional drawing of the piping heating apparatus shown in FIG. The figure which shows the inside of the piping heating apparatus shown in FIG. 3 typically. The schematic diagram which shows the modification of the VOC collection | recovery apparatus used by 1st Embodiment. The perspective view of the modification shown in FIG. The top view of the slime aeration tank used in 1st Embodiment. FIG. 9 is a plan view of the slime aeration tank of FIG. 8. Sectional drawing which shows the 1st modification of a slime aeration tank. The figure which shows typically the 2nd modification of a slime aeration tank. The figure which shows typically the 3rd modification of a slime aeration tank. The figure which shows typically the 4th modification of a slime aeration tank. The figure which shows typically the 5th modification of a slime aeration tank. The cross-sectional view of the slime aeration tank of FIG. The flowchart explaining 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Excavator 2 ... Triple pipe rod 3 ... Mouth pipe 4 ... Slime storage tank 5 ... 1st slime aeration tank 6 ... 2nd slime aeration tank 7 ... Heavy metal removal device 8 ... concrete pump 9 ... triple swivel 10 ... slime sample extraction device 11 ... first VOC recovery device 12 ... first blower 13 ... high speed mixer 14 ... Pipe heating device 15 ... Slime circulation injection device,
16, 16A ... second VOC recovery device 17 ... second blower 18 ... heavy metal recovery device 20 ... simultaneous filling monitor C ... filling material S ... slime

Claims (7)

The step (S1) of inserting the injection and injection device (2) into the bore hole (H) and the nozzle (221, 221) provided above the injection and injection device (2) when the injection and injection device (2) are pulled up. 222) a high-temperature fluid (Jc) of 80 ° C. to 90 ° C. is injected from 222), and a filling material (C) is injected from an injection port (21o) provided below the injection and injection device (2); (C) In the process of injecting, the process of removing pollutants by the purification equipment (4, 5, 6) provided on the ground side (E) the slime (S) that has flowed out to the ground side (E) The step of removing the contaminants includes a step of aspirating the slime and a step of sucking and removing the contaminants vaporized and separated from the slime. In the step of aerating, the end of the slime transport pipe (T2) (T2b) to fill the aeration tank (5) slime The slime is sprayed toward the space that is not formed, and the slime in the aeration tank (5) is sucked into the slime circulation line (152) connected to the vicinity of the bottom of the aeration tank (5), and the slime circulation line (152 ) Joins the high pressure air injection pipe (151) where the high pressure air (Fa1) is fed, and the mixed fluid (Jsa) of the slime (Ys) and the high pressure air (Fa1) is supplied to the vertical wall surface (52) of the aeration tank (5). ) Contaminated soil purification method, The contaminated soil purification method according to claim 1, further comprising a step of supplying the slime from which the pollutants have been removed to the injection and injection device (2). The contaminated soil purification according to any one of claims 1 and 2, wherein the slime supplied to the aeration tank (5) through the slime transport pipe (T2) is heated by a heating device (14) provided in the slime transport pipe (T2). Construction method. Contaminants from the injection and injection device (2) inserted into the borehole (H), the construction device (101) pulling up the injection and injection device (2), and the slime (S) flowing out to the ground side (E) Purification equipment (4, 5, 6) and a sealing device (3, 3C) for sealing the ground portion of the borehole (H), and the injection and injection device (2) is provided above it The nozzles (221, 222) and the inlet (21o) provided below the nozzles (221, 222) are provided, and a high-temperature fluid (Jc) of 80 ° C. to 90 ° C. is ejected from the nozzles (221, 222). The purification material (4, 5, 6) is configured to inject the filling material (C) from the aeration apparatus (5) that aerates the slime and separates the contaminants, and vaporizes and separates it from the slime. Contaminant Recovery for Suction and Removal of Contaminated Pollutants The aeration device (5) includes an aeration tank (5), a slime transport pipe (T2) for supplying slime to the aeration tank (5), and a slime circulation device (15). And the end (T2b) of the slime transport pipe (T2) is opened horizontally toward the space of the aeration tank (5) that is not filled with the slime, and the slime circulation device (15) A slime circulation pipe (152) connected to the vicinity of the bottom of the tank (5) and sucking slime in the aeration tank (5) joins the slime circulation pipe (152) and is supplied with high-pressure air (Fa1). The high pressure air injection pipe (151) has a vertical wall surface (52) of the aeration tank (5) in which the mixed fluid (Jsa) of slime (Ys) and high pressure air (Fa1) is supplied. Injected to collide with Contaminated soil remediation apparatus characterized by having that function. 5. The contaminated soil purification device according to claim 4, further comprising a supply device (8, T6) for supplying the slime from which contaminants have been removed to the injection and injection device (2). The contaminated soil purification apparatus according to any one of claims 4 and 5, further comprising a pipe heating device (14) for heating the slime to the slime transport pipe (T2). It has a volatile substance recovery device (16A), and the volatile substance recovery device (16A) is disposed in the refrigerant tank (161) through which the refrigerant (Lc) flows and in the refrigerant tank (161). A pollutant pipe (Lv), the pollutant pipe (Lv) is bent in a bent shape to form a heat exchanger, and a volatile substance (VOC) flows through it. The contaminated soil purification apparatus of any one of Claims 4-6 comprised so that it may do.

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