JP4683913B2 - Contaminated soil purification method and apparatus - Google Patents

Description

The present invention relates to a method and apparatus for purifying contaminated soil, and more specifically, a method for purifying contaminated soil that can decompose polycyclic aromatic hydrocarbons (hereinafter also referred to as PAH: Polycyclic Aromatic Hydrocarbon) in addition to oil using microorganisms. And device .

  Soil pollution due to oil-based substances has become apparent in the sale of factory sites of companies that have used a lot of oil, such as the energy industry and fuel facilities. There are various types of pollutants. Among them, PAH is extremely hardly decomposable and may produce an intermediate product with high carcinogenicity. PAH also contains substances suspected of acting as environmental hormones. For this reason, PAH is subject to regulation worldwide. In Japan as well, some PAHs are designated as items requiring monitoring for soil or air pollution.

  There are various methods for decomposing pollutants in soil contamination and restoring the environment, and one of them is a biological method. Biological techniques mainly utilize the degradation action due to the metabolism of microorganisms, and are expected to be put to practical use because they have the advantage of being easy to manage at low cost.

  In recent years, as a biological environment repair method that is being researched and developed, there is a land farming method (solid layer processing method). The land farming method is a method of excavating contaminated soil, adding nutrients or the like to activate indigenous or externally introduced microorganisms, and decomposing the contaminants by microbial metabolism. However, in the case of the land farming method, the heavy oil component tends to remain. In particular, it is difficult to decompose polycyclic aromatic hydrocarbons (hereinafter also referred to as PAH), and no report example has been found that sufficiently decomposes to PAH. Specific examples of PAH that are difficult to decompose include fluoranthene, pyrene, benzo (a) anthracene, chrysene, benzo (b) fluoranthene, benzo (k) fluoranthene, benzo (a) pyrene, indeno (1,2,3-C, D) pyrene, dibenzo (a, h) anthracene, benzo (g, k, i) perylene.

  Besides the land farming method, there is a slurry method in which contaminated soil is slurried and processed. However, in any method, PAH having 2 to 3 benzene rings can be decomposed by microorganisms, but PAH containing 4 or more benzene rings is hardly decomposed.

  In view of aerobic metabolism of microorganisms, degradation of 2- to 3-ring PAH (for example, naphthalene, phenanthrene, anthracene, etc.) has been confirmed. The rate of degradation of each compound by microorganisms appears to depend on the water solubility of these compounds. However, little is known about the microbial degradation of PAHs with 4 or more rings. That is, the actual situation is that the purification technology using biological decomposition of PAH has not yet been systematically and practically established.

  For this reason, PAH is currently processed by low temperature heating and combustion. However, these methods have high processing costs including equipment costs. Therefore, development of a biological treatment method considered to have a relatively low treatment cost is expected.

  As one type of slurry method intended to decompose PAH, a method for adjusting the oxidation-reduction potential and pH of the soil slurry is known (for example, Patent Document 1). However, it is practically complicated to make a large amount of contaminated soil into a slurry and finely adjust the soil oxidation-reduction potential and pH of the slurry. In addition, the soil treatment is usually required to treat a large amount of soil, and it is often desired to purify the soil at a site where contaminated soil exists. In particular, when processing sludge accumulated under water such as harbors, estuaries, and lakes, it may be required to purify the sludge on the spot rather than pulling it up from the water and treating it separately. .

JP 2004-66195 A

Under the circumstances as described above, an object of the present invention is to provide a method and apparatus for simply purifying contaminated soil containing PAH. Moreover, this invention makes it a subject to provide the purification method and apparatus of contaminated soil which are easy also in a vast area | region. Furthermore, this invention makes it a subject to provide the purification method and apparatus of contaminated soil which can hold down initial cost, such as equipment cost, and the running cost of processing operation.

In order to solve the above problems, the present invention employs the following means.
A first invention is a method of activating aerobic microorganisms to purify contaminated soil, a step of slurrying contaminated soil in a contaminated soil treatment region, and a step of supplying oxygen into the contaminated soil region And a step of providing a rectifying plate-like body in the contaminated soil treatment region and forming a water flow circulating in the contaminated soil treatment region.

  According to the first invention, the PAH is not simply stirred in the water but also provided with a rectifying plate-like body in the treatment area to generate a circulating water flow in the contaminated soil treatment area. Containing contaminated soil can be purified in a short period of time. Further, by circulating a water flow throughout the contaminated soil treatment area, the contaminated soil treatment area can be evenly purified.

  Aerobic microorganisms may activate native ones in contaminated soil, or may be introduced from the outside. Moreover, it is preferable that the agitation of the contaminated soil is caused to flow in a circulating flow without causing the stagnation of the contaminated soil. There are no particular limitations on the shape, material, arrangement, and the like of the rectifying plate as long as it can partition the region so that a circulating water flow can be formed in the contaminated soil treatment region.

  2nd invention forms the water flow which circulates in the contaminated soil processing area | region using the stirring apparatus which stirs contaminated soil, and the oxygen supply apparatus which supplies oxygen in a contaminated soil processing area | region, The said pollution characterized by the above-mentioned It is a soil purification method.

  A water flow is formed in the contaminated soil treatment region. For this purpose, a water flow can be formed by using a mechanical flow generator such as a propeller or an aeration type that blows out air. By the way, in the present invention, oxygen is supplied to the contaminated soil treatment region in order to activate the aerobic microorganisms. In the second invention, aeration by the oxygen supply device is used for water flow formation. is there. By supplying oxygen using an oxygen supply device and using it for forming a water flow, the purification process can be performed efficiently.

  3rd invention is the said contaminated soil purification | cleaning method which equips the location where sludge tends to stagnate with a water flow generator, and joins the water of the location where it stays easily to the water flow which circulates in the contaminated soil treatment area | region.

  In the present invention, a rectifying plate-like body is provided to form a circulating water flow in the contaminated soil treatment region, but depending on the shape of the contaminated soil treatment region, a place where the water flow is likely to stagnate may occur. Therefore, it is possible to more evenly purify the contaminated soil treatment area by providing a water flow generation device at a place where it is likely to stay, and joining the water at the place where it tends to stay with the water flow circulating in the contaminated soil treatment area. it can. The water flow generator may be a mechanical type using a propeller or an aeration type that ejects air.

  4th invention is the said contaminated soil purification method of covering the water surface upper space of a contaminated soil processing area | region and performing a processing operation in closed space, and deodorizing the air in closed space with a deodorizing apparatus.

  While the contaminated soil is agitated and purified in water, off-flavors can occur. If a strange odor diffuses around, it will adversely affect the surrounding environment. Therefore, the contaminated soil treatment area is spatially closed so as not to emit a strange odor, and the air in the closed space is deodorized to prevent environmental pollution due to the strange odor.

  5th invention is the said contaminated soil purification method which adds a nutrient salt in a contaminated soil processing area | region. A nutrient salt is added to activate aerobic microorganisms. The nutrient salt is not particularly limited as long as it is a component that can activate microorganisms contained in the contaminated soil. Examples of nutrient salts include salts of nitrogen, phosphorus, potassium, trace elements, and the like.

  6th invention is the said contaminated soil purification | cleaning method which divides | segments a contaminated soil processing area | region into a some small area | region, and performs a purification | cleaning process sequentially for every small area.

  When the contaminated soil treatment area is large-scale, the contaminated soil area is divided into a plurality of small areas, and the purification process is performed for each small area. be able to.

  7th invention is the said contaminated soil purification method whose contaminated soil treatment area | region is an area | region where sludge accumulated in water.

  8th invention is a contaminated soil purification apparatus provided with the outer frame which surrounds a contaminated soil processing area | region, the baffle plate arrange | positioned in the sludge processing area | region, and the slurrying apparatus which slurries contaminated soil. The apparatus of the present invention is a suitable apparatus for carrying out the above-described method of the present invention. The outer frame surrounding the contaminated treatment area is not particularly limited as long as it can partition the contaminated soil treated area or the contaminated soil from the outside world. For example, the outer frame may be a container such as a tank, or a steel sheet pile. It may be a frame formed by combining partition plates such as (sheet pile). In the case of partitioning from the outside by the partition plate, it is not always necessary to partition the four sides, the bottom, and the like as long as the outside and the contaminated soil treatment area can be partitioned in the purification process. The rectifying plate-like body is appropriately arranged at a position suitable for circulating the sludge slurried in the contaminated soil treatment region. The slurrying apparatus may be any apparatus that can stir and mix contaminated soil and liquid, such as a propeller mixer. In order to activate the aerobic microorganisms, the apparatus of the present invention may preferably be equipped with an oxygen supply device and the like.

  The present invention can be implemented with devices that can be easily transported to a contaminated site, and can be easily implemented at a site where contaminated soil exists. The treatment of sludge deposited under the surface of a port, estuary, lake, pond, etc. is required to be completed at or near the site as the scale increases. Therefore, the present invention is suitable for the purification treatment of sludge accumulated under the surface of a water such as a harbor, an estuary, a lake, and a pond. Moreover, the method of the present invention can be carried out in either a seawater region or a freshwater region.

  According to the present invention, contaminated soil containing PAH can be easily purified. Further, according to the present invention, large-scale processing is simple and cost can be reduced. Moreover, according to this invention, a purification process is possible on the spot of contaminated soil. Furthermore, according to the present invention, it is possible to carry out the process without giving off a strange odor even during the purification process.

  Below, embodiment of the contaminated soil purification method of this invention is illustrated with drawing and demonstrated in detail. In addition, this invention is not limited from the following embodiment.

[First Embodiment]
The first embodiment will be described with reference to FIGS. 1-1 and 1-2. FIG. 1-1 is a plan view of the first embodiment. FIG. 1-2 is a cross-sectional view of the first embodiment.

  In the first embodiment, the contaminated soil is purified in the reaction tank 10. The reaction tank 10 having the tank 15 as an outer frame is provided with an aeration apparatus 30 for supplying air. The aeration apparatus 30 includes a pipe 37 and a nozzle portion 36, and air is supplied from the outside into the reaction tank 10 by a compressor (not shown).

  The reaction vessel 10 is provided with a propeller-type underwater mixer 40. The underwater mixer 40 is supported by a support (not shown) and is provided so as to be movable up and down. Further, the reaction vessel 10 is provided with a rectifying plate 20 at substantially the center.

  As shown in FIG. 1-2, when water 90 is stored in the reaction tank 10 and the sludge 91 is introduced, the sludge 91 is deposited at the bottom of the reaction tank 10. The underwater mixer 40 and the aeration apparatus 30 are operated. A water flow is generated in the reaction tank 10 by the underwater mixer 40, and a water flow FL is generated so as to circulate around the current plate 20. As nutrients, nitrogen and phosphoric acid are added as appropriate. In this way, indigenous aerobic microorganisms are activated in the sludge 91, and the sludge 91 is circulated in the reaction tank 10 while being slurried to purify the sludge 91. With simple equipment as shown in the reaction tank 10, the contaminated soil can be purified uniformly. After the purification treatment, water is discharged from the reaction tank 10, and the purified soil is collected and discarded.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS. 2-1, 2-2, and 2-3. FIG. 2-1 is a plan view of the second embodiment, and FIG. 2-2 is a cross-sectional view taken along the line II ′ in FIG. 2-1. FIG. 2C is a diagram showing the underwater mixer 41. The description of the same configuration as that of the first embodiment is omitted.

  In the second embodiment, an outdoor lagoon is targeted as the contaminated soil treatment region 11. In 2nd Embodiment, although the outer periphery of a lagoon can form the outer frame of a contaminated soil processing area | region, you may partition the outer periphery of a lagoon with a partition plate or a sheet | seat (not shown). In the second embodiment, four water flow generating trolleys 51 are installed in the contaminated soil treatment region 11. The water flow generating pedestal 51 is equipped with a submersible mixer 41, a compressor 38 and an aeration device 31 on a pedestal 50.

  As shown in FIG. 2-3, the underwater mixer 41 includes a support rod 46 and three propeller type agitation units 47. The propeller type stirring unit 47 can change the direction as indicated by the arrows. A water flow is generated in the contaminated soil treatment region 11 by the underwater mixer 41. Further, a part of the propeller stirring unit 47 is inserted into the sludge 91 by the underwater mixer 41 to make the sludge 91 into a slurry.

The aeration apparatus 31 mounted on the water flow generating pedestal 51 feeds the air sent out by the compressor 38 into the contaminated soil treatment region to supply oxygen, and is substantially the same as the water flow generated by the underwater mixer in the air injection direction by the nozzle. By making it the same direction, formation of the water flow which circulates in the contaminated soil processing area | region 11 is promoted auxiliary. Further, a part of the plurality of nozzles is inserted into the sludge 91, and the sludge 91 is agitated and slurried with air. Nozzle inserted into the layer of sludge 91, with an emphasis on agitation of sludge 91, as long as no contaminated soil region 11 significantly inhibited the flow of circulating water in air, not necessarily the direction of the circulating water flow FL It is not necessary to match.

  In the contaminated soil treatment region 11, four water flow generating trolleys 51 are provided, and a rectifying plate 20 is provided in a substantially central portion. The four water flow generating pedestals 51 are each provided with two rectifying plates 20 sandwiched between both sides. The rectifying plates 20 are used as partitions so that a clockwise circulating water flow FL is generated in FIG. 2-1. Be placed. By forming the water flow FL that circulates around the current plate 20 by the water flow generating pedestal 51, the sludge in the contaminated soil treatment region 11 can be uniformly treated.

  As shown in FIG. 2B, a temporary vinyl tent roof 61 is provided in the upper space of the contaminated soil region 11. The contaminated soil treatment area 11 is spatially closed by the temporary vinyl tent roof 61, and the release of a strange odor that may occur during the purification process can be prevented. There is a possibility that off-flavors accumulate in the gas phase portion of the contaminated soil treatment region 11. Therefore, a deodorizing device 60 is provided to remove the off-flavor in the gas phase. By providing the deodorizing device 60, a comfortable working space is provided even when an operator has to enter the contaminated soil treatment area.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 3 is a plan view of the third embodiment. In addition, description is abbreviate | omitted about the same structure as the said embodiment.

In the third embodiment, aeration devices 32 are provided at the four corners of the contaminated soil treatment region 11. In the contaminated soil treatment region 11, a circulating water flow FL is formed by the water flow generation pedestal 51 and the rectifying plate 20, but the slurry tends to stagnate at the four corners of the contaminated soil treatment region 11. If the stagnation occurs, there is a risk of unevenness in the degree of purification treatment. Therefore, aeration devices 32 are provided at the four corners where water is likely to stagnate, and (FL ₂ ) air is ejected in the forward direction with respect to the flow of the circulating water flow FL to prevent stagnation of water. In the third embodiment, the aeration device 32 is provided at the four corners, but a mechanical stirring device or the like may be used.

  In this way, when there is a portion where water is likely to stagnate in a part of the contaminated soil treatment region 11, a more uniform purification treatment in the contaminated soil treatment region can be performed by arranging an aeration device 32 or the like at that portion. It can be carried out.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG. In addition, description is abbreviate | omitted about the same structure as the said embodiment.

  When an outdoor contaminated soil treatment area is to be purified as it is, most of the area has an irregular shape. By adjusting the shape of the rectifying plate 20 or combining a plurality of rectifying plates 20, a water flow that circulates appropriately along the shape of the contaminated soil treatment region 12 can be formed, and the purification treatment can be performed more uniformly. it can. In FIG. 4A, the water current generating trolley 51 is omitted.

In 4th Embodiment, the two baffle plates 20 are installed combining in a T shape . Further, when a portion where water stagnates occurs only with the rectifying plate 20, an aeration apparatus or an underwater mixer (not shown) may be installed as an auxiliary.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG. In addition, description is abbreviate | omitted about the same structure as the said embodiment.

In the fifth embodiment, the contaminated soil treatment region 13 is divided into four small regions using a region partition plate 21. Partition plate 21, the outer frame of the small area is formed by etc. the steel sheet piles. In the fifth embodiment, the rectifying plate 20 is provided for each small region, and the circulating water flow FL is generated. In FIG. 4B, the water current generating trolley 51 is omitted. This is suitable when the contaminated soil treatment region 13 is too large compared to the work facility. Moreover, even when the shape of the contaminated soil treatment region 13 is extremely irregular, it is possible to adjust the region shape so that a circulating water flow is easily generated by appropriately partitioning the region. A more uniform purification treatment can be performed by appropriately partitioning the contaminated soil treatment region 13.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIGS. 5, 6-1, 6-2 and 7. In addition, description is abbreviate | omitted about the same structure as the said embodiment. FIG. 5 shows an overall construction flowchart. FIG. 6A shows the purification process of the A block, which is one area of the contaminated soil treatment area. FIG. 6-2 shows a II ′ cross section of FIG. FIG. 7 shows a state where the A block is being reclaimed while the C block purification process is being performed.

The sixth embodiment shows an example of a purification process in a harbor pool where sludge is accumulated on the ground 92. First, as step S1, preparation work for construction is performed. Next, as step 2, preparatory work for sludge purification treatment and revetment work by placing steel sheet piles associated therewith are performed to isolate the contaminated soil treatment region 14 from the outside. The following processes will be implemented as preparatory work. First, the contaminated soil treatment area 14 is divided into four sections (A block to D block) by the partition plate 21. In addition, a temporary vinyl tent 61 is set up. A deodorizing device 60 is installed. The contaminated soil agitation platform ship 52 on which the backhoe 62 is mounted is arranged at a predetermined position. Preparation for the arrangement of the water current generating platform 51 is made. Further, the aeration apparatus 32 is installed.

In step S3, the sludge purification process is started from the A block. In order to loosen the sludge accumulated at the bottom, a layer of sludge 91 is dug up by the backhoe 62 mounted on the contaminated soil agitating trolley 52 . A water current generating trolley 51 is installed from the place where the excavation by the backhoe 62 is completed. At the completion of digging by the backhoe 62, four water flow generating pedestals 51 are installed.

A part of the propeller type agitating part of the underwater mixer 41 mounted on the water flow generating ship 51 is inserted into the sludge 91 layer, and the sludge 91 is agitated. Further, to generate a water flow FL ₃ by water mixer 41 and aeration unit 32, to form a water flow FL in the A block. In addition, the aeration apparatus 32 provided at the four corners of the A block prevents water from staying at the four corners. The odor generated by the purification process is not leaked to the outside because the A block is covered with the temporary vinyl tent roof 61, and is removed from the gas phase of the A block by the deodorizing device 60. Continue aeration while circulating sludge as described above for about 3 weeks. Collect the mud being treated at any time, analyze the oil contained in the mud, and confirm that it has fallen below a predetermined value.

  Following the completion of the purification process in the A block, in a step S4, the B block is purified by the same method.

  After completion of the purification process in the B block, in step S5, the A block is reclaimed while the purification process is proceeding in the C block as shown in FIG. The dumping truck carries in the earth and sand for reclaiming and puts it into the A block. The introduced earth and sand is leveled using a backhoe 62 and a bulldozer 63.

  In step S6, D block purification processing is performed. In addition, after the A block landfill is completed, the A block and B block partition plates 21 are pulled out, and the B block landfill is started.

In step S7, the purification process up to the D block and the landfill work are completed, and the partition plate 21 and the current plate 20 are removed.
In step S8, equipment restoration work such as disaster prevention small levee work and drainage work is performed as finishing work.

  As described above, the contamination treatment area is divided into small areas and sequentially subjected to the purification treatment, whereby the purification treatment can be efficiently and uniformly performed even in a large area.

[Reference experiment example]
(1) Contaminated soil treatment test A comparison test between a solid phase purification method and a liquid phase purification method was conducted. The following tests were conducted using contaminated soil containing polycyclic aromatic compounds.

  As a solid layer purification method, 100 g of a specimen was placed in a sealed bottle, the gas phase portion was replaced with oxygen gas, and then allowed to stand at 30 ° C. In addition, an experiment was performed on a system to which nitrogen and phosphorus were added and a system to which no nitrogen was added.

  As a liquid phase purification method, 20 g of a specimen and 80 mL of distilled water were placed in a sealed bottle, the gas phase portion was replaced with oxygen gas, and 30 ° C. shaking culture (150 rpm) was performed. In addition, an experiment was performed on a system to which nitrogen and phosphorus were added and a system to which no nitrogen was added.

  About each system, each test substance was extract | collected 3 weeks after the reaction start, N-hexane was extracted as a solvent, and it analyzed by HPLC (high performance liquid chromatography). As a result of analysis, it was confirmed that the oil phase decomposition was promoted by the liquid phase purification method than by the solid phase purification method. In both cases, it was confirmed that the oil decomposition was promoted in the system to which nitrogen and phosphorus were added.

(2) Slurry treatment test of sludge accumulated in seawater area The sludge accumulated in the seawater area was purified using a 6 liter reaction tank. The reaction tank was charged with 2 liters of sludge and 2 liters of seawater, and aerated and stirred at room temperature.

Stirring conditions: 500 rpm
Aeration conditions: 1 L / min (1 week of test start)
5L / min (1 week after the start of the test)

The reason why the pressure was set to 1 L / min at the beginning of the test was that the amount of air supply was reduced because foaming due to aeration was severe.
The oil film, oil odor and oil concentration were measured over time from the start of the test. The oil film and oil odor were tested by a sensory test. The oil concentration was measured by N-hexane extraction weight method. The test results are shown in Table 1.

The evaluation regarding the oily odor in Table 1 is as follows.
++++: Strong odor ++: Odor odor +: Slight odor-: No odor

  The present invention is suitable for purification of contaminated soil, and can be applied to purification treatment of sludge deposited under the surface of water as a specific form.

It is a top view which shows 1st Embodiment. It is sectional drawing of FIGS. 1-1. It is a top view which shows 2nd Embodiment. It is the II 'sectional view taken on the line of FIG. It is a figure which shows a water flow mixer. It is a figure which shows 3rd Embodiment. It is a figure which shows 4th Embodiment. It is a figure which shows 5th Embodiment. It is a flowchart which shows the construction process of 6th Embodiment. It is a figure which shows one of the construction processes of 6th Embodiment. It is I-I 'sectional drawing of FIGS. It is a figure which shows one of the construction processes of 6th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Reaction tank 11, 12, 13, 14 Contaminated soil processing area 15 Tank 20 Current plate 21 Area partition plate 23 Steel sheet pile 30, 31, 32 Aeration apparatus 36 Nozzle part 37 Piping 38 Compressor 40, 41 Underwater mixer 46 Support rod 47 Propeller Stirrer 50 50 51 Water flow generator 52 Contaminated soil mixer 60 Deodorizer 61 Temporary vinyl tent roof 62 Backhoe 63 Bulldozer 64 Dump truck 90 Water 91 Sludge 92 Ground 93 Landfill Air Air FL, FL2 Direction of water flow A A block B B block C C block D D block

Claims (5)

In a method for purifying contaminated soil by activating aerobic microorganisms,
(1) A stirrer for stirring the contaminated soil, a compressor for sending air, a pipe connected to the compressor, and a nozzle part connected to the pipe, wherein a part of the nozzle part is added to the contaminated soil. Slurry the contaminated soil in water using an aeration apparatus that is inserted and injects the air and includes the nozzle part; and
(2) A step of supplying oxygen into the slurried contaminated soil using the aeration device while circulating the slurried contaminated soil around the rectifying plate using the stirring device. And contaminated soil purification method. In the step (1), a stirrer equipped with a propeller stirrer, a water flow generating carriage mounted with the compressor and the aeration device are provided in a contaminated soil treatment region, a part of the propeller stirrer and the nozzle A part of the part is inserted into the contaminated soil,
2. The step (2) is a step of circulating the slurried contaminated soil so that the air injection direction by the nozzle unit is further in the same direction as the circulation flow generated by the stirring device. Contaminated soil purification method.   The apparatus further comprises a water flow generating device provided at a place where the slurryed contaminated soil is likely to stay, and the water flow generating device allows the contaminated soil at the place where the slurry is easily stored to flow around the rectifying plate. The contaminated soil purification method according to claim 1 or 2, wherein the method is performed while merging. The pollution according to claim 2 or 3, wherein the step (1) and the step (2) are performed in a closed space so as to cover an upper space of the contaminated soil treatment region, and the closed space is deodorized by a deodorizing device. Soil purification method. An outer frame surrounding the contaminated soil treatment area, a rectifying plate-like body disposed in the contaminated soil treatment area, an agitating device for agitating the contaminated soil, a compressor for sending out air, and piping and piping connected to the compressor An aeration apparatus including the nozzle section, a part of the nozzle section being inserted into contaminated soil and injecting the air, the agitator, the compressor, and the aeration apparatus. A contaminated soil purification apparatus comprising: a water flow generating trolley provided in the contaminated soil treatment region .

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