JP7363012B2 - Suction/supply equipment used in multi-stage remediation of contaminated soil - Google Patents

Description

The present invention relates to a technology for purifying contaminated soil by supplying or suctioning gas or liquid into soil contaminated with volatile organic compounds (VOCs), heavy metals, agricultural chemicals, etc. to decompose or remove pollutants. .

The bioventing method, which is a purification method for oil-contaminated ground, is an in-situ bioremediation technology that uses the power of microorganisms to repair contaminated soil without excavating it. Gas is sucked and supplied through a well installed in contaminated ground with an unsaturated layer, and nutrients are supplied to increase the activity of oil-degrading bacteria that live in the soil, thereby breaking down oil into water and carbon dioxide. Since the sucked gas is released to the atmosphere through an activated carbon adsorption tower, it can be purified while removing volatile substances and preventing the diffusion of odors. Compared to excavation and removal, this method has less impact on the environment, is more economical, and can be applied to factories that are still in operation.
When applying the bioventing method, it is important to suck and supply gas to the entire depth to be purified. If there is locally a stratum with low permeability or a stratum with high oil content, contamination may remain, so a general-purpose high-pressure double packer is inserted into the well to concentrate gas from a specific depth. It is necessary to perform suction. High-pressure double packers that purify one depth per well are commercially available. Methods for purifying multiple layers have also been proposed.
Patent Document 1 (Japanese Unexamined Patent Publication No. 2010-188220) describes a process of creating one injection well using a well material having injection parts for a plurality of fluids (gas or liquid), and A soil contamination purification method has been proposed, which includes the step of supplying fluid to each of a plurality of fluid injection sections vertically separated by a partition plate, and injecting the fluid into the soil from each of the plurality of fluid injection sections. There is.
Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2010-452) discloses that a chemical that promotes the movement of pollutants is infiltrated into contaminated soil, and that both pumping and injection operations are performed between the injection well and the pumping well. By providing a pumping and injection well that can be used for purification, pollutants can be efficiently removed from contaminated soil even if the distance between the injection well and the pumping well is wide, that is, the area to be purified is wide. A method is disclosed. It is equipped with multiple packers and can be inserted into a well with the packers in a contracted state.

JP2010-188220A Japanese Patent Application Publication No. 2010-000452

The purpose is to develop a suction/supply pipe with a mechanism that can suction or inject into multiple layers of the ground. In particular, we will develop a suction/supply device with a mechanism that can be reduced to smaller diameters.

1. An upper suction/injection nozzle head for a suction/supply device having a mechanism capable of suctioning or injecting into multiple layers of the ground,
It has a central through hole in the center for suction or injection and a small through hole for air at the periphery .
The central through hole has a large diameter part at the top and a small diameter part at the bottom,
The small diameter part is the diameter through which the lower pipe leading to the lower suction/injection nozzle head is inserted.
The large diameter portion has a size that allows the lower end of the pipe disposed at the top to be opened, and a side hole is provided that communicates from the large diameter portion to the opening provided on the side surface ;
Upper suction/injection nozzle head featuring:
2. A suction/supply device comprising a plurality of suction/injection nozzle heads above and below that can suction or inject into multiple layers of the ground,
The suction/injection nozzle head for the upper suction/delivery device is 1. The upper suction/injection nozzle head as described,
The suction/injection nozzle head for the lower suction/supply device has a central suction/injection chamber and a small through hole at the periphery;
the chamber is open at the top to the lower end of a pipe extending from the upper suction/injection nozzle head and is provided with a side hole leading from the chamber to an opening in the side;
A suction/supply device for multiple layers of ground, characterized by:
3. A suction/supply device for multiple layers of the ground, comprising a plurality of upper and lower packers for the strata to be treated, and a suction/injection nozzle head located between the pair of packers,
The upper side is 1. The upper side is the suction/injection nozzle head, the lower side is 2. Must be the lower aspiration/injection nozzle head as described ;
A suction/supply device for multiple layers of ground, characterized by:
4. An air injection pipe and a plurality of suction/injection pipes arranged on the upper end side, an upper packer head to which these air injection pipes and a plurality of suction/injection pipes are connected, and an upper and lower pair of This is a suction/supply device for a plurality of geological formations, which connects a packer, a plurality of formation treatment sections each having a nozzle head between the upper and lower packers, and a gap hose connecting the formation treatment sections and a lower packer head. hand,
In the upper packer head, air through-holes that pass through the top and bottom and multiple suction/injection pipes are arranged concentrically, and the suction/injection pipes arranged concentrically extend downward . The air through hole is connected to an air injection pipe, and the suction/injection pipes arranged concentrically are connected to multiple suction/injection pipes.
The concentric pipe arrangement is from the outside to the inside, with pipes from the upper treatment layer to the lower treatment layer,
The lower end of the concentrically arranged pipes is the position of the nozzle head located at the top from the outer pipe,
The nozzle head on the upper side has a central through hole in the center , a small through hole on the periphery , and a side hole that communicates from the central through hole to an opening provided on the side. The end of the suction/injection pipe opens into the central through hole,
The nozzle head on the lowermost side has a chamber in the center that is open at the top , a small through hole in the periphery , and a side hole that communicates from the chamber to an opening provided on the side, which allows suction/removal of the innermost core. The end of the injection pipe is open to the chamber;
In the gap hose and the intermediate hose, the air flow path is formed between the inner wall of the hose and the suction/injection pipe arranged concentrically ;
A suction/supply device for multiple geological formations, characterized by:

1. We were able to create a suction/supply pipe with a mechanism that can suction or inject into multiple layers of the ground.
2. By providing a central through hole having a large diameter part and a small diameter part in the upper nozzle head, providing a side hole communicating from the large diameter part to the side opening, and using the small diameter part as a passage for the pipe for the lower nozzle head, The nozzle head can be downsized. By providing a plurality of upper nozzle heads, the number of strata to be treated can be increased.
3. We have developed a mechanism in which multiple supply pipes are arranged concentrically and are opened sequentially from the outer pipe to the upper nozzle head, allowing the pipes to extend to the lower nozzle head through the central through hole of the upper nozzle.
4. In intermediate hoses and gap hoses, there is no need to provide a dedicated air pipe by forming a gap between concentric pipes on the inner wall of the hose as an air flow path.
5. By using the suction/supply device of the present invention, it is possible to downsize a well for in-situ purification that targets two or more contaminated strata.

The figure which shows the example of an upper stage nozzle head. The figure which shows the example of a lower stage nozzle. Figure 1 shows example 1 of the suction/supply device. Figure 2 shows the upper packer head of example 1 of the suction/feeding device. FIG. 3 is a diagram showing the upper nozzle head of Example 1 of the suction/supply device. FIG. 3 is a diagram showing the lower nozzle head of Example 1 of the suction/supply device. Figure 3 shows the hose connector of example 1 of the suction/supply device. Figure 3 shows the lower packer head of example 1 of the suction/dispensing device. FIG. 3 is a diagram showing an example of concentric pipes in Example 1 of the suction/supply device. Diagram of a well. The figure which shows the example of another structure of a well. Diagram showing data in treatment tests.

The present invention is a device used for in-situ purification of soil and groundwater contaminated with volatile organic compounds and oils using a well installed in the ground without excavating the soil or groundwater.
The main in-situ purification technologies for contaminated ground located in an unsaturated zone above the groundwater table include soil gas aspiration and bioventing. The soil gas aspiration method is a method of purifying unsaturated ground contaminated with volatile organic compounds, and the pollutants are recovered by sucking gas from a well installed in the contaminated ground. The bioventing method is a method of purifying unsaturated ground contaminated with oil. By sucking or supplying gas from a well installed in the contaminated ground and supplying nutrients, volatile oil is recovered. Decomposes oil by increasing the activity of oil-degrading bacteria that live in the soil.
INDUSTRIAL APPLICATION This invention is a device which can be utilized for both the method of sucking soil gas and the method of supplying nutrient salts and the like.

Contaminants may be present at multiple depths, and countermeasures include multistage wells and high-pressure double packers. Multi-stage wells are constructed by alternately combining perforated and non-perforated well pipes among general-purpose well pipes, so that gas can be sucked from any perforated pipe depending on the remaining level of contamination. It is something that was done. High-pressure double packers are often used for injection of chemical liquids, etc. By inserting them into a well and sending air to two packer rubbers to pressurize and expand them, gas or liquid can be sucked to a specific depth. It is a device that can perform injections and injections. When a plurality of high-pressure double packers (hereinafter referred to as "double packers") are set, purification operation can be performed for the spaces between the respective double packers. Utilizing this, if there are multiple depths (geological strata) where contamination remains, the fixed depth of the double packer can be made to correspond to each target contamination depth (contaminated stratum).
The present invention is a device that can be applied to a purification device that uses a plurality of double packers that can be used to purify a plurality of contaminated soils.

The present invention relates to a technique for inserting a multilayer packer into a multilayer well installed in contaminated ground, and specifically relates to a suction/supply device equipped with a multilayer packer. We will also propose a suction/supply pipe mechanism and equipment such as nozzles used in the suction/supply device.
An outline will be explained using a suction/supply device (in the case of a two-layer type) equipped with a multilayer packer of the present invention shown in FIG. 3.
In this suction/supply device 10, two packers 3 are provided in a treatment tube 55, one above the other. An upper suction/injection nozzle head 1 is provided between the upper pair of packers 31, 31, and a lower suction/injection nozzle head 2 is provided between the lower pair of packers 32, 32. This device uses the upper and lower nozzle heads to suck in contaminated gas and supply nutrients to the two layers. An air injection tube 91, an upper suction tube 92, and a lower suction tube 93 are connected to the upper end of the treatment tube 55 from the outside. Although the upper suction tube 92 and the lower suction tube 93 can also be used for injection, they will be referred to as "suction tubes" for short.
The present invention proposes a miniaturized device by arranging these three tubes concentrically within the treatment tube 55. We have developed a suction and supply nozzle structure that can be applied with a concentric pipe structure. We also developed an upper packer head 4 to convert three separate tubes into concentric circles.
In this device, the upper suction pipe 92 and the lower suction pipe 93 are connected to concentrically arranged pipes, and each is connected to a nozzle, so each system can be controlled independently. Although it is named as a suction pipe here, it can also be used as a supply pipe. Alternatively, one may be used for suction and the other for supply.

Each mechanism and device structure of the present invention will be explained using FIGS. 1 to 9.
FIG. 1 is a diagram showing an example of an upper suction/injection nozzle head (hereinafter sometimes abbreviated as "upper nozzle head") 1. As shown in FIG.
The upper nozzle head 1 has a central through hole 11 at the center and four small through holes 12 at the periphery, and the central through hole 11 has a large diameter portion 13 on the upper side and a small diameter portion 14 on the lower side. A side hole 15 is provided from the large diameter portion 13 toward the side surface.
The concentric pipe 9 is inserted into the central through hole 11, and the large diameter portion 13 has an open lower end of the upper pipe 9a connected to the upper suction pipe 92, which communicates with the side hole 15 and is used for the upper stratum to be treated. . A lower pipe 9b connected to a lower suction pipe 93 passes through the small diameter portion 14. Note that a ring packing is provided in the small diameter portion 14 to prevent gas and the like processed in the large diameter portion from flowing downward.
The small through hole 12 is an air flow path and is connected to an air injection pipe 91 that supplies air to pressurize the packer 3.

This structure of the upper nozzle head 1 makes it possible to treat the upper contaminated stratum, and there is no need to provide separate treatment pipes for the lower stratum. Since the small through holes 12 for air circulation are provided between the four side holes 15 provided in the radial direction, the nozzle is also miniaturized.

FIG. 2 is a diagram showing an example of a lower suction/injection nozzle head (hereinafter sometimes abbreviated as "lower nozzle head") 2. As shown in FIG.
The lower nozzle head 2 has a chamber 21 with an open top and a small through hole 22, and a side hole 25 communicating from the chamber 21 to an opening provided on the side surface.
In the chamber 21 of the lower nozzle head 2, the lower end of the lower pipe 9b is open and communicates with the side hole 25, so that the stratum to be treated below can be treated.
The small through hole 22 is an air circulation hole similar to the small through hole 12 of the upper nozzle head 1. A packer 32 is provided below the lower nozzle head 2. Air is pressurized from top to bottom at the same pressure to inflate the packer.
In the example shown in Figure 3, the upper and lower nozzles are shown as a suction/supply device that processes two strata, but by providing a plurality of upper nozzle heads 1, the number of strata to be treated can be increased to three or more. can be increased.

FIG. 3 shows a suction/feeding device equipped with the multilayer packer of the present invention as described above.
A more detailed structure will be explained here.
Connected to the upper end of the treatment tube 55 are an air injection pipe 91 connected to a compressor that presses in air, an upper suction pipe 92 that acts on the upper strata to be treated, and a lower suction pipe 93 that acts on the lower strata to be treated. ing. By increasing the number of suction pipes, it is possible to handle three or more strata to be treated.
The treatment tube 55 includes, in order from the top, an upper packer head 4, an upper packer rubber 31a in the upper pair of packers 31, 31, an upper nozzle head 1, an intermediate hose 51, and a lower packer rubber 31b. An upper treatment section 5a, a hose connector 7, a gap hose 6, a lower packer head 8, a lower treatment section 5b, and an end plug 59 are provided. The lower treatment section 5b includes the upper packer rubber 32a in the lower pair of packers 32, 32, the lower nozzle head 2, the intermediate hose 51, and the lower packer rubber 32b.

Inside the treatment tube 55, an air flow path 91a, an upper gas flow path 92a, and a lower gas flow path 93a are formed concentrically. There is one air flow path from the upper end to the lower packer rubber 32b, and it is a closed system, and the pressure of the compressor expands each packer rubber. Each gas flow path opens into the side holes of the upper nozzle and the lower nozzle, so that gas can be sucked or injected from the treated stratum.
The intermediate hose can be used to adjust the length of the treatment section, and the gap hose can be used to adjust the length of the upper and lower treatment layer pipes.

FIG. 4 shows the structure of the upper packer head 4. The upper packer head 4 has the function of converting the air injection pipe 91, upper suction pipe 92, and lower suction pipe 93 connected to the upper end into a concentric pipe 9, and the function of connecting to the packer 3.
FIG. 4(a) shows a plan view, and the upper surface of the upper packer head 4 includes an air through hole 41 to which an air injection pipe 91 can be connected, an upper gas hole 42 to which an upper suction pipe 92 can be connected, and a lower suction pipe 93. A lower gas hole 43 to which the gas can be connected is provided.
FIG. 4(b) shows an AOC cross section, in which a central hole 44 having a ceiling at the center and opening at the bottom is provided. The central hole 44 is narrowed upward to form a medium diameter portion 44b and a small diameter portion 44a. The lower gas hole 43 includes a horizontal hole 43b communicating with the medium diameter portion 43. Note that after the side holes 43b and 42b are drilled from the side, the side openings are closed. The air through hole 41 penetrates from the top surface to the bottom surface.
FIG. 4(c) shows an A-O-B cross section, and includes a horizontal hole 42b of the upper gas hole 42 that communicates with the small diameter portion 44a of the center hole 44.

A concentric pipe 9 is inserted into the central hole 44, and pipes corresponding to the respective diameters are inserted into the small diameter part 44a and the medium diameter part 44b, and the corresponding gas or agent passes through them. It happens.

FIG. 5 shows the structure of the upper nozzle head 1. This structure is common to the upper nozzle head shown in FIG. 1, so common symbols are used.
The upper nozzle head 1 has a large diameter part 13 on the upper side and a small diameter part 14 on the lower side, and has a central through hole 11 in the center and four small through holes 12, which are air flow paths, on the periphery. A side hole 15 is provided from the diameter portion 13 toward the side surface. Female screws 16, 16 are provided at the top and bottom of the upper nozzle head, and are connected to the upper and lower parts, respectively.
A concentric pipe 9 is inserted into the central through hole 11, and the lower end of the upper pipe 9a is open and communicates with the side hole 15 for use in the upper stratum to be treated. The lower pipe 9b passes through the small diameter portion 14. A ring packing 17 is provided in the small diameter portion 14 to prevent gas and the like processed in the large diameter portion 13 from flowing downward.

The concentric pipe 9 penetrates vertically, and the lower end is open to each nozzle head. On the other hand, air is opened to the upper and lower female screw chambers, and passes through a small through hole 12 between the upper and lower female screw chambers. Similarly, the upper nozzle head, the lower nozzle head, the hose connector, and the packer head pass through small diameter through holes, but in the hose section, the structure is such that the connection passes through the gap between the inner wall of the hose and the concentric pipe 9.

FIG. 6 shows the structure of the lower nozzle head 2. This structure is common to the lower nozzle head shown in FIG. 2, so common symbols are used.
The lower nozzle head 2 is open at the top and is provided with a chamber 21 having a side hole 25 opening on the side surface and a small through hole 22. The lower end of the lower pipe 9b is open in the chamber 21 and communicates with the side hole 25, so that the stratum to be treated below can be treated. Female screws 26, 26 are provided at the top and bottom of the lower nozzle head, and are connected to the upper and lower parts, respectively.
The small through hole 22 is an air circulation hole similar to the small through hole 12 of the upper nozzle head 1, and communicates with the packer rubber 32b located below. Air is pressurized from top to bottom at the same pressure to inflate the packer.

FIG. 7 shows the structure of the hose connector 7. The hose connector 7 is a device used to connect the packer and the gap hose 6 or to connect the upper and lower nozzles to the intermediate hose 51.
The hose connector 7 is provided with a central through hole 71 and four small through holes 72 around the central through hole 71. Male threads 75 are formed on the top and bottom, allowing connection to devices on the top and bottom.
The concentric pipe 9 passes through the central through hole 71, and the small through hole 72 serves as an air flow path.

FIG. 8 shows the structure of the lower packer head 8. The lower packer head 8 is a member connected above the lower packer 32, and has a central through hole 81 through which the lower pipe 9b passes and one small through hole 82 through which air flows. Male screws 85, 85 are provided on the upper and lower outer peripheries for connection.

FIG. 9 shows the cross-sectional structure of the gap hose 6 and the intermediate hose 51 provided with the concentric pipe 9.
In the suction/supply device 10 shown in FIG. 3, the upper pipe 9a extends up to the upper nozzle head 1, so the concentric pipe 9 becomes a double pipe at the upper nozzle head and above, and a gap hose is provided above the packer 31. This is a case where the In the cross section of the intermediate hose 51 and the gap hose 6 below, the concentric pipe 9 passing through the hose becomes a lower pipe 9b leading to the lower nozzle head 2, but in Fig. 9, multiple processing pipes are shown. An image of concentric circles is shown. That is, an example of a configuration that can perform multi-stage processing will be shown.
A concentric pipe 9 having a double pipe structure having an upper pipe 9a and a lower pipe 9b passes through the inside of the hose. Three gaps are formed in the cross-sectional configuration, and each gap serves as a flow path for air, upper gas, and lower gas. That is, the gap between the inner wall of the hose and the upper pipe 9a becomes the air flow path 91a, the gap between the upper pipe 9a and the lower pipe 9b becomes the upper gas flow path 92a, and the inside of the lower pipe 9b becomes the lower gas flow path 93a. Each gas flow path opens into the side holes of the upper nozzle and the lower nozzle, so that gas can be sucked or injected from the treated stratum. The air flow path runs through the treatment tube 55 from the upper end to the lower packer rubber 32b, forming a closed system, and the pressure of the compressor expands each packer rubber. The intermediate hose can be used to adjust the length of the treatment section, and the gap hose can be used to adjust the length of the upper and lower treatment layer pipes.

In the example of FIG. 3, the mechanism for converting the air injection pipe 91, upper suction pipe 92, and lower suction pipe 93 connected from the outside into concentric configurations is described as the upper packer head 4, but this mechanism is A clearance hose can also be placed at the top, and a gap hose can be provided below this mechanism to deal with deep treatment formations.

[Test example]
<Well configuration>
Using the suction/supply device 10 for multiple geological formations of the present invention, a test was conducted in which it was applied to a multistage suction well targeting two upper and lower strata. The configuration of the multistage suction well is shown in Figure 10.
The well itself for soil purification shown in Figure 10 is a common one. A strainer pipe 105, which is a combination of a perforated pipe and a non-perforated pipe, is set inside an excavated hole 101 obtained by boring the ground, and a suction/supply device 10 is installed inside the strainer pipe 105. The perforated pipe is installed at least to the depth of the contaminated stratum to be treated. In the space between the strainer pipe 105 and the excavation hole 101, the contaminated layer to be treated is filled with a breathable filler (such as No. 2 silica sand) 106, and the untreated portion, such as the silt layer 104, is filled with a permeable filler (such as No. 2 silica sand). is filled with a sealing filler (such as bentonite) 107.
In this example, the contaminated layer A exists at a depth of 3.5 to 4.5 m, and the contaminated layer B exists at a depth of 12.5 to 13.5 m, so the depth of the well is 19.5 m, and the perforated pipe of the strainer is also Similarly, the upper packers 31, 31 were set at positions corresponding to the contaminated layer A, and the lower packers 32, 32 were set at positions corresponding to the contaminated layer B.

The configuration of the well shown in Figure 10 shows a configuration in which a perforated pipe is placed in the target stratum to be treated, but perforated pipes and non-perforated pipes are arranged alternately so that the nozzle head is positioned toward the target stratum. It can also be configured to do so. In this case, the target stratum can be changed by changing the position of the nozzle head.
FIG. 11 shows a configuration example of a well in which perforated pipes 105a and non-perforated pipes 105b are arranged alternately. A breathable filler 106 is filled around the perforated pipe 105a, and a sealing filler 107 is filled around the non-perforated pipe 105b. In FIG. 11, the description of the suction/supply device is omitted.

<Contamination status>
A: The ground is contaminated with heavy oil. After carrying out purification using the conventional bioventing method, we conducted a boring survey and analyzed the oil concentration (IR method), oil odor, and oil film, and found that the oil concentration was 4,000 mg near GL-4.0m, 13.0m, and 16.0m. It was found that more than 1 kg of contamination remained (Figure 12 (a) oil odor in the test contaminated stratum).
In this study, gas suction was performed using a two-layer packer at two depths where contamination remained, around GL-4.0m (upper layer) and around GL-13.0m (lower layer), and the purification effect was verified.

<Test conditions>
The fabricated suction/supply device 10 was installed in a multistage well, and the rubber packer was expanded to a depth that could suck gas from the perforated pipe section, with the upper layer at GL-3.5 to 4.5 m and the lower layer at GL-12.5 to 13.5 m. It was fixed.
The upper and lower layer suction hoses of the fixed packer were connected to the existing gas suction equipment (vacuum blower), and the valves were adjusted to suck gas at a suction rate of 80 to 100 L/min for both the upper and lower layers. The purification operation period was approximately 8 months, and the operating status was checked once a month using a gas flow meter attached to the piping. In addition, in order to confirm the purification effect of the two-layer packer, a boring survey was conducted near the multi-stage well 1 month, 4 months, and 8 months after the start of operation, and oil concentration (IR method), oil odor, The oil slick was analyzed. Nutrient salts were supplied by appropriately supplying a solution (nutrient water) in which ammonium nitrate, dipotassium hydrogen phosphate, and potassium dihydrogen phosphate were dissolved from the ground surface or from a well pipe.

<Test results>
The test results are shown in FIGS. 12(b), (c), and (d).
Purification operation using a two-layer packer was carried out for approximately eight months, and a total of approximately 17,000 kL of gas was sucked into the upper layer and approximately 23,000 kL from the lower layer (Figure 12 (b) Cumulative gas suction amount). After approximately 150 days of operation, the amount of gas suction decreased slightly, but this was due to freezing of the suction hose and piping of the gas suction equipment exposed above the ground due to the drop in winter temperatures and snowfall. It was confirmed that there were no problems with the structure and gas suction capacity of the two-layer packer.
The range including 0.5 m above and below the gas suction depth is defined as the gas suction influence range, and the average oil concentration and oil odor changes are shown in the upper layer at GL-3.0 to 5.0 m and the lower layer at GL-12.0 to 14.0 m (Figure 12 (c) Progress of oil odor). The oil concentration in both the upper and lower layers gradually decreased during the purification operation period, and after 8 months, it was 400 mg/kg in the upper layer and 1,200 mg/kg in the lower layer. The degree of oil odor also decreased as the oil concentration decreased, and no oil film was observed at any depth after 4 months from the start of the purification operation.
Figure 12 shows the relationship between the cumulative gas suction amount and oil concentration (average value of gas suction depth) for the period when purification operation was carried out using the conventional method by supplying nutrients and the period when purification operation was carried out using the two-layer packer. (d) Shown in suction amount comparison. Even with the conventional method, the oil concentration decreased as the cumulative amount of gas suction increased, but when the two-layer packer was used, the oil concentration decreased more quickly with a smaller amount of gas suction. Conventional methods are inefficient because gas is sucked in from depths where there is relatively little contamination or from depths where purification has been completed, whereas with a two-layer packer, purification operations are concentrated at depths where contamination remains. Therefore, it was confirmed that the two-layer packer has a higher purification effect when contamination is unevenly distributed.

1: Upper suction/injection nozzle head (upper nozzle head 11: center through hole 12: small through hole 13: large diameter section 14: small diameter section 15: side hole 16: female thread

2: Lower suction/injection nozzle head (lower nozzle head)
21: Chamber 22: Small through hole 25: Side hole 26: Female screw

3: Packer 31: Upper pair of packers 31a, 31b, 32a, 32b: Packer rubber 32: Lower pair of packers

4: Upper packer head 41: Air through hole 42: Upper gas hole 42b: Side hole 42b
43: Lower gas hole 43b: Side hole 44: Center hole 44a: Small diameter part 44b: Medium diameter part

5: Treatment section 5a: Upper treatment section 5b: Lower treatment section 55: Treatment tube 59: End plug

6: Gap hose 7: Hose connector 71: Central through hole 72: Small through hole 75: Male thread

8: Lower packer head 81: Center through hole 82: Small through hole 85: Male screw

9: Concentric pipe 9a: Upper pipe 9b: Lower pipe 91: Air injection pipe 92: Upper suction pipe 93: Lower suction pipe 91a: Air passage 92a: Upper gas passage 93a: Lower gas passage 10: For suction/supply Device

100: Multistage suction well 101: Drill hole 102: Contaminated layer 103: Contaminated layer 104: Silt layer 105: Strainer pipe 106: Air permeable filler 107: Sealing filler

Claims (4)

An upper suction/injection nozzle head for a suction/supply device having a mechanism capable of suctioning or injecting into multiple layers of the ground,
It has a central through hole in the center for suction or injection and a small through hole for air at the periphery .
The central through hole has a large diameter part at the top and a small diameter part at the bottom,
The small diameter part is the diameter through which the lower pipe leading to the lower suction/injection nozzle head is inserted.
The large diameter portion has a size that allows the lower end of the pipe disposed at the top to be opened, and a side hole is provided that communicates from the large diameter portion to the opening provided on the side surface ;
Upper suction/injection nozzle head featuring: A suction/supply device comprising a plurality of suction/injection nozzle heads above and below that can suction or inject into multiple layers of the ground,
The aspiration/injection nozzle head for the upper aspiration/injection device is an upper aspiration/injection nozzle head according to claim 1;
The suction/injection nozzle head for the lower suction/supply device has a suction/injection chamber in the center and a small through hole at the periphery;
the chamber is open at the top to the lower end of a pipe extending from the upper suction/injection nozzle head and is provided with a side hole leading from the chamber to an opening in the side;
A suction/supply device for multiple layers of ground, characterized by. A suction/supply device for multiple layers of the ground, comprising a plurality of upper and lower packers for the strata to be treated, and a suction/injection nozzle head located between the pair of packers,
The upper side is the upper suction/injection nozzle head according to claim 1, and the lower side is the lower suction/injection nozzle head according to claim 2;
A suction/supply device for multiple layers of ground, characterized by: An air injection pipe and a plurality of suction/injection pipes arranged on the upper end side, an upper packer head to which these air injection pipes and a plurality of suction/injection pipes are connected, and an upper and lower pair of This is a suction/supply device for a plurality of geological formations, which connects a packer, a plurality of formation treatment sections each having a nozzle head between the upper and lower packers, and a gap hose connecting the formation treatment sections and a lower packer head. hand,
In the upper packer head, air through-holes that pass through the top and bottom and multiple suction/injection pipes are arranged concentrically, and the suction/injection pipes arranged concentrically extend downward . The air through hole is connected to an air injection pipe, and the suction/injection pipes arranged concentrically are connected to multiple suction/injection pipes.
The concentric pipe arrangement is from the outside to the inside, with pipes from the upper treatment layer to the lower treatment layer,
The lower end of the concentrically arranged pipes is the position of the nozzle head located at the top from the outer pipe,
The nozzle head on the upper side has a central through hole in the center , a small through hole on the periphery , and a side hole that communicates from the central through hole to an opening provided on the side. The end of the suction/injection pipe opens into the central through hole,
The nozzle head on the lowermost side has a chamber in the center that is open at the top , a small through hole in the periphery , and a side hole that communicates from the chamber to an opening provided on the side, which allows suction/removal of the innermost core. The end of the injection pipe is open to the chamber;
In the gap hose and the intermediate hose, the air flow path is formed between the inner wall of the hose and the suction/injection pipe arranged concentrically ;
A suction/supply device for multiple geological formations, characterized by:

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