JP2012125665A - Method for purifying soil pollution - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for purifying soil pollution that can efficiently purify polluted soil in situ by uniform penetration of a chemical liquid into the soil in a short period of time.SOLUTION: In the method for purifying soil pollution, the linear feed velocity of the chemical liquid 5 to the soil 1 is equal to or less than the saturated hydraulic conductivity of the soil 1, and gas 6 is supplied to the soil 1 substantially simultaneously with the chemical liquid 5. In the method for purifying soil pollution, a method may be used in which the supply pressure of the chemical liquid 5 to the soil 1 is equal to or less than the soil suction pressure and the gas 6 is supplied to the soil 1 substantially simultaneously with the chemical liquid 5.

Description

  The present invention relates to a soil contamination purification method for supplying a chemical solution to soil. Specifically, the present invention relates to a method for decomposing or stabilizing a pollutant that has penetrated into soil due to leakage from a factory or the like with a chemical solution such as a microbial agent.

In recent years, pollutants have leaked from factories and the like, and have permeated into the soil, and their influence on the human body has been regarded as a problem. In 2003, the Soil Contamination Countermeasures Law was enacted, and the methods for treating harmful substances such as benzene, volatile organic compounds (VOC), heavy metals, and agricultural chemicals are regulated.
Although it is not a harmful substance, oil needs to be countered because it mixes with groundwater to produce an oil film or oil odor.
Until now, many excavation and removal of contaminated soil have been carried out as countermeasures against contamination by these pollutants.
However, a law revision was made in 2010 to tighten the control of excavation and removal due to concerns about the diffusion of contaminants and inappropriate treatment.
As a result, in-situ purification methods that purify contaminated soil in the ground without excavating the soil, that is, in-situ purification, have become a priority.
Therefore, at present, there is a need for a more efficient method for purifying pollutants such as harmful substances and oil in situ.

Until now, microbial treatment, chemical oxidation treatment, pumping treatment, washing treatment, suction treatment, heat treatment, etc. have been carried out as in-situ purification.
Among these in-situ purifications, in microbial treatment and chemical oxidation treatment, it is necessary to effectively infiltrate the chemical solution into the underground contaminated area.
However, the underground soil quality is uneven due to gravel, sand, silt, clay, buried objects, remains, animals and plants and remains. In addition, the presence or absence of groundwater and its flow state are various, and there are also various contaminated areas containing pollutants.

Here, a conventional technique for purifying the soil 92 in which the contaminated area 91 is dispersed will be described with reference to FIG. This soil 92 is in an unsaturated state where the contaminated area 91 is above the groundwater level 93 and the gap between the particles of the soil 92 is not saturated with water.
In this case, when the chemical solution 94 is supplied at the original position, the chemical solution 94 flows down almost immediately due to its own weight, so that it is difficult to infiltrate the chemical solution 94 in the horizontal direction from the chemical solution supply position. Therefore, it is difficult to spread the chemical solution 94 to the contaminated area 91 that is remote from the chemical solution supply position. That is, it is difficult to effectively infiltrate the chemical solution 94 into the soil 92.

Further, when the factory is in operation or the gas station is in operation, there are many restrictions on the supply position, the number, and the supply time of the chemical solution when purifying the underground soil. For this reason, it is difficult to sufficiently permeate the chemical solution, resulting in poor purification or a long time for purification.
Therefore, a method has been implemented in which a chemical solution is pressurized and supplied in a horizontal direction using a horizontal nozzle in order to effectively infiltrate the chemical solution. However, due to the size of the soil particles constituting the soil, the distribution of the packing density thereof, impurities, etc., there are variations in the gaps between the particles through which the chemical solution penetrates. For example, there are relatively large coarse gaps (so-called water channels) and fine particle gaps. For this reason, a phenomenon that the chemical solution easily flows into the coarse gap and the chemical solution does not easily flow into the fine gap occurs, and the chemical solution cannot always uniformly penetrate into the soil. In addition, even when the chemical solution was ejected at a high speed in the horizontal direction, it immediately decelerated due to the resistance of the soil, and flowed down due to its own weight, so that the horizontal penetration was not sufficient.

  Then, the method of making a chemical | medical solution penetrate | infiltrate uniformly into soil is proposed (refer patent document 1). In the method of patent document 1, the line supply speed of a chemical | medical solution is made into the value below 1/10 of the saturated hydraulic conductivity of soil. Thereby, the chemical | medical solution is made to flow in preferentially to a fine gap using the suction pressure of the particle | grain gap | interval of soil. Therefore, the chemical solution can be uniformly permeated into the soil, and a small amount of the chemical solution is sufficient as compared with the conventional pressurized supply method.

Japanese Patent Laid-Open No. 2008-211984

As described above, when purifying the underground soil of the gas station, the supply period of the chemical solution is limited when the gas station is in operation. Even in the case of partial purification, the chemical supply period must be at most 1 to 2 weeks.
However, when the method described in Patent Document 1 is used, since the line supply speed of the chemical solution is about 10 ⁻⁴ cm / s, about 4 months are required to penetrate 1 m. Therefore, the method described in Patent Document 1 has a problem that the chemical solution cannot be uniformly permeated in a short period of time.

  An object of the present invention is to provide a soil contamination purification method capable of purifying contaminated soil efficiently by uniformly infiltrating a chemical solution in a short period of time in situ.

(1) The soil contamination purification method of the present invention is a soil contamination purification method for supplying a chemical solution to soil, wherein a line supply speed of the chemical solution to the soil is equal to or lower than a saturated hydraulic conductivity of the soil, The gas is supplied to the soil substantially simultaneously.
(2) The soil contamination purification method of the present invention is a soil contamination purification method for supplying a chemical to soil,
A supply pressure of the chemical solution to the soil is equal to or lower than a soil suction pressure, and gas is supplied to the soil substantially simultaneously with the chemical solution.
(3) In the present invention, in the soil contamination purification method according to (1) above, it is preferable that the line supply rate of the chemical solution is 10 ⁻³ cm / s or less.
(4) In the present invention, in the soil contamination purification method according to any one of (1) to (3), the volume supply rate (unit: mL / min) of the gas to the soil is the chemical solution. The volume supply rate (unit: mL / min) is preferably 100 times or less.
(5) In this invention, in the soil contamination purification method as described in said (4), it is preferable that the volume supply rate of the said gas is 10 to 100 times the volume supply rate of the said chemical | medical solution.
(6) In the present invention, in the soil contamination purification method according to any one of (1) to (5), the supply position of the gas to the soil is lower than the supply position of the chemical solution. It is preferable.
(7) In the present invention, in the soil contamination purification method according to any one of (1) to (6), it is preferable that a supply direction of the gas to the soil is a substantially horizontal direction.
(8) In the present invention, in the soil contamination purification method according to any one of (1) to (7), the gas is any one of air, a mixture of air and oxygen gas, and oxygen gas. Preferably there is.
(9) In the present invention, in the soil contamination purification method according to (8), the gas is a mixture of air and oxygen gas, and the mixture has an oxygen gas concentration of 42 volumes based on the total amount of the mixture. % Or more is preferable.
(10) In the present invention, in the soil contamination purification method according to any one of (1) to (9), the chemical solution is an aqueous solution or a suspension, and is a microbial agent, a microbial nutrient, oxygen A generator, a pH adjuster, an oxidizer, and a heavy metal insolubilizer are preferably any one kind or a combination of two or more kinds.

  According to the soil contamination purification method of the present invention, the contaminated soil can be efficiently purified by infiltrating the chemical solution uniformly in a short period of time at the original position.

Schematic for demonstrating the soil pollution purification method which concerns on this invention. Schematic for demonstrating the soil contamination purification method which concerns on Example 1 of this invention. Schematic for demonstrating the soil contamination purification method which concerns on Example 2 of this invention. Schematic for demonstrating the conventional soil contamination purification method.

Hereinafter, the soil contamination purification method of the present invention will be specifically described.
The soil contamination purification method of the present invention is an effective method for purifying soil in the case of an operating factory and the underground soil of an operating gas station being contaminated with contaminants. This is particularly effective when the ground is covered with concrete or paving material, and only a part of the ground can be excavated and chemicals can be supplied only from a limited position. In this case, the distance between the points where the chemical solution or the like can be supplied is about 1 m at the shortest.

  The soil has a contaminated zone and a contaminated soil layer containing pollutants. Examples of pollutants include harmful substances and oils regulated by the Soil Contamination Countermeasures Law. Examples of harmful substances include benzene, volatile organic compounds (VOC), heavy metals, and agricultural chemicals.

Moreover, the soil has a coarse gap and a fine gap. The coarse gap is, for example, a trace of a root of a plant, a life trace of an insect or other underground creature, and is a gap of a millimeter order size or a submillimeter order size formed in soil. The coarse gap is also called a macropore. On the other hand, the fine gap is a fine gap between soil particles and is also called a micropore.
Such soil is composed of gravel, sand, silt, clay, aggregates thereof, and the like. The soil has different saturated hydraulic conductivity due to the difference in these compositions. Here, the saturated hydraulic conductivity is a value representing how much water can flow per unit time in the soil when the gap between the soil particles is saturated with water. The saturated hydraulic conductivity is also the maximum value that allows water to penetrate into the soil only by gravity.

Table 1 shows the saturated hydraulic conductivity of gravel, sand, silt, a mixture of silt and clay, and clay constituting the soil. In addition, when a saturated hydraulic conductivity is 10 < ^-7 > cm / s or less, it is a level called impermeable.

The present invention is a method of purifying by supplying chemicals to such soil. That is, the soil contamination purification method of the present invention is a method in which the line supply rate of the chemical solution to the soil is equal to or lower than the saturated hydraulic conductivity of the soil, and gas is supplied to the soil substantially simultaneously with the chemical solution.
When the line supply speed of the chemical solution exceeds the saturated hydraulic conductivity of the soil, the chemical solution is likely to flow in preference to the coarse gap rather than the fine gap. In this case, the chemical solution tends to flow almost directly through the coarse gap, and the chemical solution cannot be uniformly permeated into the soil through the fine gap. Further, since the chemical liquid flows almost directly below, it is necessary for a long period of time to penetrate to a position away from the chemical liquid supply position.
On the other hand, in the present invention, the chemical solution is supplied at a linear supply speed equal to or lower than the saturated hydraulic conductivity, and the gas is supplied almost simultaneously with the chemical solution, so that the gas flows preferentially into the coarse gap and the chemical solution flows into the coarse gap. Can be prevented. Thereby, since a chemical | medical solution can be selectively made to flow into a fine gap | interval, a chemical | medical solution can be osmose | permeated uniformly to soil through a fine gap | interval in a short period of time.
Further, even when the line supply rate is a saturated hydraulic conductivity, the supply rate is 10 times that of the method of Patent Document 1, so that the chemical solution can be permeated in a shorter period of time than before.
Further, when the chemical solution flows into the coarse gap, a large amount of the chemical solution is required. However, since the chemical solution is selectively allowed to flow into the fine gaps, the chemical solution is not wasted and can be uniformly permeated into the soil with a small amount.
Moreover, the soil is often composed of particles having a size equal to or less than the size of sand, and the saturated hydraulic conductivity is generally 10 ⁻³ cm / s or less. Therefore, it is preferable that the chemical | medical solution line supply speed is 10 < ^-3 > cm / s or less. That is, the chemical solution can be uniformly permeated into the soil in a short period of time by setting the linear supply rate of the chemical solution to be equal to or lower than the general saturated hydraulic conductivity of soil.

In addition, the soil is subjected to negative pressure, that is, soil suction, in the fine gap. By this soil suction pressure, the soil is in a state of sucking the chemical solution into the fine gap by itself.
From this, the supply pressure of the chemical solution in the present invention may be equal to or lower than the soil suction pressure.
Thus, unlike the conventional pressure injection of the chemical solution, the chemical solution can be permeated in preference to the fine gap without forcibly supplying the chemical solution.
The soil suction pressure works strongly in a state where only a small amount of water is present in the gap between the particles. On the other hand, when the soil is close to having a saturated hydraulic conductivity, the gap between the particles is almost saturated with water, so that the soil suction pressure hardly works.

The chemical solution can be supplied to the soil by various chemical solution supply means. Any chemical supply means may be used as long as it can supply the saturated hydraulic conductivity or less, but it is preferable that the chemical liquid does not flow out due to its own weight. As such a chemical solution supply means, for example, a porous body, a fibrous body, a thin tube, etc., and those having fine holes are preferable.
By having the micropores, the surface of the micropores can be brought into contact with the soil, and the chemical solution can be permeated into the soil from the micropores.
The chemical solution supply means is installed in a hole (groove) provided by excavation. Here, when installing in the bottom of a hole, it is preferable to weight by putting a weight on the upper part of a chemical | medical solution supply means.
On the other hand, when the chemical solution supply means is installed on the wall surface of the hole, it is preferable to press the surface of the micropores against the soil of the wall surface by mechanically expanding the chemical solution supply means. In addition, when the chemical solution supply means is annular, a bag body may be disposed therein and the bag body may be inflated. In addition, after installing the chemical solution supply means on the wall surface of the hole, a fine soil may be filled in the gap between the chemical solution supply means and the wall surface of the hole.
In particular, in the case of supplying a chemical solution with the supply pressure of the chemical solution being equal to or lower than the soil suction pressure, a permeometer or the like can be used as the chemical solution supply means. Thereby, it can supply to soil so that a positive pressure may not be applied to a chemical | medical solution.
The chemical solution is an aqueous solution or suspension, and is a microbial agent, a microbial nutrient, an oxygen generator, a pH adjuster, an oxidizing agent, a heavy metal insolubilizer, and an adsorbent, or a combination of two or more. Is preferred. By using these chemical solutions, it is possible to oxidatively decompose or stabilize the pollutants into harmless and stable inorganic substances such as carbon dioxide and water.

The gas used in the present invention may be any kind, but air, oxygen gas, and a mixture thereof are preferable. Use of air is advantageous in terms of cost.
In the case where the chemical solution is at least one of an aerobic microbial agent and an oxidizing agent, it is preferable to use oxygen gas or a mixture of oxygen gas and air as the gas. Thereby, the activity and oxidation action of aerobic microorganisms can be promoted. The mixture of oxygen gas and air is preferably high oxygen concentration air. As this high oxygen concentration air, the concentration of oxygen gas is preferably 42% by volume or more based on the total amount of the mixed gas, more preferably 63% by volume or more, and still more preferably 84% by volume or more. .

In the conventional purification method in which a chemical solution is supplied under pressure, the chemical solution flows into the coarse gap. For this reason, oxygen gas could not be sufficiently distributed in the soil through the coarse gap. However, in the present invention, since oxygen gas or the like is supplied through the coarse gap, the oxygen gas or the like can be spread all over. Therefore, as described above, the aerobic microorganism activity and oxidation action can be dramatically accelerated.
On the other hand, when the chemical solution is an anaerobic microbial agent, it is preferable to remove oxygen gas contained in the soil. For example, by using an inert gas such as nitrogen, the time until the oxygen gas in the soil disappears can be shortened.

Volume supply rate of gas to soil (unit: mL / min) is preferably 100 times or less, more preferably 10 times or more and 100 times or less of the volume supply rate of the chemical solution at room temperature and normal pressure. Even more preferably, it is 20 times or more and 50 times or less.
By setting the gas volume supply rate to 100 times or less, the gas can be prevented from flowing into the fine space, and the chemical solution can easily penetrate into the fine space. Thereby, the penetration time of a chemical | medical solution can be shortened. On the other hand, by setting it to 10 times or more, the chemical solution can be prevented from flowing into the coarse gap.

The gas supply position is preferably in the vicinity of the chemical liquid supply position, and more preferably downward. When the chemical solution is supplied at a high line supply speed such as a saturated hydraulic conductivity, the chemical solution is likely to flow into the coarse gap. However, by setting the gas supply position in the vicinity of the chemical liquid supply position, it is possible to prevent the chemical liquid from flowing into the coarse gap by diffusing the chemical liquid with the gas.
Moreover, when a chemical | medical solution is supplied with a high line supply speed like a saturated hydraulic conductivity, a chemical | medical solution will be easy to flow down substantially directly under dead weight. However, by setting the gas supply position below the chemical supply position, it is possible to prevent the chemical liquid from flowing down almost directly.
The gas supply direction is preferably a substantially horizontal direction. Thereby, it can prevent that a chemical | medical solution flows down directly under dead weight, can accelerate | stimulate the movement to a horizontal direction of a chemical | medical solution, and can penetrate | permeate more widely. Note that in the case where it is desired to infiltrate the chemical solution in a specific direction, the gas may be supplied in that direction.
Gas supply to the soil is performed by a gas supply means. Any gas supply means may be used as long as a gas nozzle for supplying gas can be installed in the soil.

  Next, the relationship between the pollutant, the chemical for purifying the soil containing the pollutant, and the specific method of the present invention using this chemical is illustrated below. The specific method of the present invention relates to in-situ processing, and other on-site processing and off-site processing are excluded.

  Next, the industry which can utilize the soil pollution purification method of this invention is demonstrated. In the industry as shown in Table 3, the present invention can be suitably used because it has generation sources such as generation substances, generation parts, generation locations and the like that may generate pollutants.

Next, the soil contamination purification method according to the present invention will be described with reference to FIG.
The soil 1 to be purified by the method of the present invention is, for example, underground soil in an operating factory. In this soil 1, contaminated areas 2 containing pollutants are dispersed at various positions. The soil 1 is above the groundwater level 3 and the gap between the particles of the soil 1 is not saturated with water.
In carrying out the method of the present invention, first, concrete or the like is partially removed from the core. Thereby, after exposing the surface of the soil 1, boring is performed to the chemical solution supply position, the soil 1 is dug, and a hole is provided. And the chemical | medical solution supply means 4 and the gas nozzle which is not shown in figure are installed in the bottom of a hole.

And the chemical | medical solution 5 is supplied below with a saturated hydraulic conductivity from the chemical | medical solution supply means 4 by pressurizing the chemical | medical solution supply means 4 suitably. At this time, the gas 6 is supplied simultaneously with the chemical solution 5. Further, the gas 6 is supplied from the horizontal direction to the lower side.
Thereby, the gas 6 can be preferentially flowed into the coarse gap, the chemical solution 5 can be prevented from flowing into the coarse gap, and the chemical solution 5 can be selectively introduced into the fine gap. Moreover, since the gap | interval of the particle | grains of the soil 1 is unsaturated, the chemical | medical solution 5 can be uniformly penetrated into the soil 1 using a soil suction pressure. And since the gas 6 is supplied to the horizontal direction from the downward direction of the chemical | medical solution supply means 4, the chemical | medical solution 5 can be osmose | permeated in a horizontal direction, without flowing down with dead weight. Accordingly, the chemical solution 5 can be evenly distributed in a short period to the contaminated area 2 that is separated from the chemical solution supply position in the horizontal direction.

  Next, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited to these examples.

Example 1
In Example 1, the soil contamination purification method of the present invention was performed on the soil shown in Table 4 under the conditions shown in Tables 5 and 6. In Example 1, as shown in FIG. 2, a contaminated soil layer 12 containing a contaminant is provided between the clean soil layers 11 of the soil 10.
In carrying out the soil contamination purification method, first, a hole was provided up to the contaminated soil layer 12 and a gas nozzle 13 was installed. The gas nozzle 13 was covered with the contaminated soil layer 12, and the chemical solution supply means 14 was installed on the clean soil layer 11 on the contaminated soil layer 12. Then, the chemical | medical solution 15 and the gas 16 were supplied to the soil 10 simultaneously, and the soil contamination purification method of Example 1 was implemented.
In Table 5, the values of N, P, and K for nutrient salts indicate the concentration ratios of nitrogen, phosphorus, and potassium, respectively. Further, in Table 5, “Supply amount of chemical solution” is a value supplied so that the chemical solution becomes 1 kg in the contaminated soil layer 1 m ³ .

(Example 2)
In Example 2, the soil contamination purification method was carried out in the same manner as in Example 1 except that the chemical solution supply means and the gas nozzle were changed.

  In Example 2, as shown in FIG. 3, a hole was excavated to the lower side of the contaminated soil layer 21 of the soil 20. And the 1st gas nozzle 22 was installed in the bottom face of the hole, and the chemical solution supply means 23, the gas nozzle 22, the chemical solution supply means 23, the gas nozzle 22, and the chemical solution supply means 23 were installed alternately on it. Then, the chemical | medical solution 24 and the gas 25 were simultaneously supplied to the soil 20, and the soil contamination purification method of Example 2 was implemented. In addition, as the chemical solution supply means, an annular fibrous body having fine holes was used.

(Comparative Example 1)
The purification method of Comparative Example 1 was carried out in the same manner as Example 1 except that no gas was supplied.

(Purification result)
In Examples 1 and 2, as shown in FIGS. 2 and 3, one week after supplying the chemicals 15 and 24, etc., boring was performed at positions 31 and 32 at 0.5 m and 1 m in the horizontal direction from the chemical supply position. And in each position 31 and 32, 1m underground soil was extract | collected and the density | concentration of the chemical | medical solution contained in the soil was measured by the pack test.
As a result, in Example 1, the nitric acid concentrations at positions 31 and 32 were 45 mg / L and 10 mg / L, respectively, and in Example 2, the nitric acid concentrations were 60 mg / L and 20 mg / L, respectively. Therefore, in Examples 1 and 2, it was confirmed that the nutrient was permeating well.
Further, in Examples 1 and 2, three months after supplying the chemical solution and the like, boring was performed at a position 32 of 1 m in the horizontal direction from the chemical solution supply position. And 1m of underground soil was extract | collected and the oil concentration was measured by GC-FID method.
As a result, in Example 1, the oil concentration was 500 mg / kg-soil, and in Example 2, the oil concentration was 300 mg / kg-soil. Therefore, in Examples 1 and 2, it turned out that purification | cleaning is advancing.

On the other hand, in Comparative Example 1, as in Example 1, the nitric acid concentration was measured at positions 31 and 32 after one week. As a result, it was found that the nitric acid concentrations were 5 mg / L and 1 mg / L, and the nutrient was hardly permeated.
In Comparative Example 1, as in Example 1, the oil concentration was measured after 3 months. As a result, it was 2400 mg / kg-soil, and it was found that purification was hardly progressing.
Therefore, in Examples 1 and 2, the chemical solution is supplied at a linear supply speed equal to or lower than the saturated hydraulic conductivity of the soil, and the gas is supplied at the same time as the chemical solution. Therefore, compared with Comparative Example 1 in which no gas is supplied, Thus, it was possible to penetrate the chemical solution to a position away from the chemical solution supply position.
Therefore, according to the soil contamination purification method of this invention, it turns out that a chemical | medical solution can penetrate | infiltrate uniformly in a short period of time, and the contaminated soil can be purified efficiently.

  The soil contamination purification method of the present invention is used to purify contaminated soil when the soil in the base of an operating factory or an operating gas station is contaminated with contaminants.

1, 10, 20 Soil 5, 15, 24 Chemical 6, 6, 25 Gas

Claims (10)

A soil contamination purification method for supplying chemicals to soil,
The line supply rate of the chemical solution to the soil is equal to or lower than the saturated hydraulic conductivity of the soil,
A method for purifying soil contamination, comprising supplying gas to the soil substantially simultaneously with the chemical solution. A soil contamination purification method for supplying chemicals to soil,
The supply pressure of the chemical solution to the soil is equal to or lower than the soil suction pressure,
A method for purifying soil contamination, comprising supplying gas to the soil substantially simultaneously with the chemical solution. In the soil pollution purification method of Claim 1,
The line supply speed | rate of the said chemical | medical solution is 10 < ^-3 > cm / s or less. The soil contamination purification method characterized by the above-mentioned. In the soil contamination purification method as described in any one of Claim 1- Claim 3,
The soil contamination purification method, wherein a volume supply rate (unit: mL / min) of the gas to the soil is 100 times or less a volume supply rate (unit: mL / min) of the chemical solution. In the soil pollution purification method of Claim 4,
The volume supply rate of the gas is 10 to 100 times the volume supply rate of the chemical solution. In the soil contamination purification method as described in any one of Claim 1- Claim 5,
The soil contamination purification method, wherein a supply position of the gas to the soil is below a supply position of the chemical solution. In the soil contamination purification method as described in any one of Claim 1- Claim 6,
The method for purifying soil contamination, wherein the gas is supplied to the soil in a substantially horizontal direction. In the soil pollution purification method as described in any one of Claim 1- Claim 7,
The soil contamination purification method, wherein the gas is any one of air, a mixture of air and oxygen gas, and oxygen gas. The soil contamination purification method according to claim 8,
The gas is a mixture of air and oxygen gas;
The soil contamination purification method, wherein the mixture has an oxygen gas concentration of 42% by volume or more based on the total amount of the mixture. In the soil contamination purification method as described in any one of Claim 1- Claim 9,
The chemical solution is an aqueous solution or a suspension, and is one or a combination of two or more of a microbial agent, a microbial nutrient, an oxygen generator, a pH adjuster, an oxidizing agent, and a heavy metal insolubilizer. And soil pollution purification method.

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