JP3930785B2 - Contaminated strata purification method and polluted strata purification system used therefor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method for in situ purification of a strata contaminated by harmful chemical substances (the stratum including a soil stratum and / or a rock body and groundwater), andContaminated geological purification system used for itAbout.
[0002]
[Prior art]
  In addition to conventionally known heavy metals, contamination of the formation by volatile organochlorine chemicals (hereinafter also referred to as “VOCs”), for example, organic solvents such as trichlorethylene and tetrachloroethylene, has become a serious social problem in recent years. In order to effectively and efficiently remove and detoxify these heavy metals and VOCs (hereinafter also referred to as “pollutants”), in addition to chemical methods, the biodegradation reaction of microorganisms is used to protect the contaminated formation. The contaminated formation purification method which is going to purify in the position is being put into practical use.
[0003]
  In addition, a method for treating an organic chlorine compound in a shorter period of time by combining a biological reaction with a physicochemical reaction has attracted attention. These in situ contaminated formation purification methods do not require excavation, movement, and backfilling of pollutant-containing soil on a large scale, and are therefore expected as a technology that enables purification treatment at low cost.
[0004]
  In other words, physical and chemical methods and microbiological methods (bioremediation)As a purification process, paying attention to the groundwater vein, a water intake facility is installed on the downstream side of the pollutant flow direction to collect the contaminated water and prevent diffusion, and at the same time to treat the collected contaminated water. There are known methods for providing a contaminated water treatment area to treat permeated (passing) contaminants, injecting microorganisms and nutrient sources upstream of the VOCs contamination source, and diffusing them into the contaminated area.
[0005]
  In addition, when purifying contaminated soil and / or contaminated groundwater in situ, living organisms under anaerobic conditions using carbon sources and inorganic reducing agents necessary for the growth and survival of microorganisms (mainly anaerobic bacteria) in the soil. A purification method that uniformly purifies the entire contaminated area directly for the purpose of maintaining the environment for chemical and physicochemical purification at a low cost for a certain period of time without using large-scale dedicated equipment ( For example, see Patent Document 1).
[0006]
  However, in the case of the contaminated formation purification method that relies on the groundwater flow, it is rather reluctant to leave the results to the flow of groundwater. In other words, it takes much time to treat the pollutants eluted in the groundwater and to purify the pollutants by eluting them from the entire contaminated formation that is difficult to purify. Moreover, since the flow of contaminated groundwater is not uniform, it is difficult to collect and treat all of the pollutants. Similarly, there is very little possibility that the injected chemicals or microorganisms and nutrients will diffuse throughout the contaminated formation.
  And because of the particularly complex geological structure, there are many examples in which contamination is expanded with chemicals used for purification.
[0007]
  Among the bioremediations, the technique of introducing bacteria with high contaminant resolution (bioaugmentation) may cause the injected microorganisms to diffuse into the surrounding strata and cause harmful effects. That is, since there is a concern about secondary contamination as a side effect, it is difficult to obtain public acceptance.
[0008]
  Further, in the conventional vacuum extraction method, when the groundwater level rises to depressurize the contaminated formation, and the contaminant is the VOCs or the like, the zone in which the contaminant can be vacuum extracted from the contaminated formation is narrow. The purification efficiency is poor. That is, in a deeply contaminated formation in the saturated zone below the groundwater surface, VOCs in the water of the saturated body are difficult to volatilize, so only the contaminated formation above the groundwater surface is purified. However, there was a waste that the deepest part of the vacuum extraction well could not be used effectively.
[0009]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-262751 (Abstract, Fig. 1)
[0010]
[Problems to be solved by the invention]
  Currently, the issues required for the treatment of geological layers contaminated with hazardous chemicals are as follows.
[0011]
  The first problem is a purification method that can completely purify the contaminated strata in its original position and has little diffusion of secondary environmental pollution. In other words, when using a method in which a fluid having a purification function based on any one of physical action, chemical reaction, microbial metabolism, and high-pressure washing is used from the well, the purification effect is spread to a deeply contaminated formation. Therefore, there is a need for a technique capable of preventing side effects caused by the chemical substances and / or microorganisms.
[0012]
  In addition, bioaugmentation that injects single or limited types of microorganisms into the ground at an unusually high density that cannot be in a normal ecosystem, in line with the purpose of purifying contaminated formations. Since there are concerns about adverse effects on ecosystems, implementing safety measures that allow public acceptance is necessary.
[0013]
  And while implementing bio-augmentation that gains public acceptance within or on the extension of technologies and equipment related to in situ contaminated formation purification methods and contaminated formation purification systems used therefor, using ultra-high pressure injection Achieve the goal.
[0014]
  As a second problem, even when a method in which the fluid is injected from one well and recovered from the other well is used, a wide range of contaminated formations including heavy metal contamination are purified at a high level without unevenness. It must be possible.
[0015]
  As a third problem, there is a need for a method for exerting a high fixed purification function for all contaminants including heavy metals.
[0016]
  Constructed with consideration for economic effects as the fourth issueSystem (plant)Therefore, it is necessary to establish an optimum condition that can increase the destruction effect of the contaminated formation while minimizing the cost for enhancing special facilities.
[0017]
  As a fifth problem, a method for efficiently recovering volatile pollutants. That is, in order to achieve a certain purification level or higher, it is necessary to remove volatile pollutants remaining in the formation by forcibly purifying them.
[0018]
  As a sixth problem, regarding the VOCs purification, when the pollutants are volatilized from the contaminated formations and the air containing the pollutants is extracted by a vacuum pump, The groundwater level rises. Then, for VOCs that are immersed in water in a contaminated formation below the groundwater surface in the saturated zone, the VOCs are difficult to volatilize, so only the contaminated formation shallower than the groundwater surface is purified. There was a waste of a significant decrease in efficiency.
  That is, the contaminated formation above the groundwater surface is only purified, and there is a waste that the deepest part of the recovery well cannot be used effectively.
  Therefore, for VOCs purification, it is necessary to push down the groundwater surface.
[0019]
  First7As a problem, even if the fluid that is the purification medium is water, if it is used without limitation, not only waste of water supply / drainage occurs, but also secondary environmental pollution may be diffused. In addition, additives to the purification medium are also redundant. Therefore, by reducing the total amount of fluid that is a purification medium, it is possible to reduce the cost by reducing the amount of additives, and establish a method that can prevent secondary environmental pollution by preventing the fluid from unnecessarily diffusing. There is a need.
[0020]
  As the eighth and ninth problems, it is necessary to increase efficiency by using existing purification equipment and technology together. In other words, the existing fluid cleaning device is used in combination with the high pressure jet cleaning method to increase efficiency.
[0021]
  First10As an issue7As with the problem of, secondary environmental pollution can be prevented by preventing the fluid from spreading unnecessarily.System (plant)A configuration needs to be established.
[0022]
  As an eleventh problem, in order to reduce the well excavation cost, it is necessary to arrange the minimum number of wells so that they can be purified more efficiently.
[Means for Solving the Problems]
[0023]
  The present invention is a purification method that can completely perform the purification of contaminated formations in situ and has little diffusion of secondary environmental pollution. That is, even when using a method in which a fluid having a purification function based on any one of physical action, chemical reaction, microbial metabolism, and high-pressure washing is injected from one well and recovered from the other well, the chemical substance is also used. And / or a contaminated formation purification method and apparatus capable of preventing side effects caused by microorganisms.
[0024]
  In the invention according to claim 1,In contaminated strata (1)In addition, a fluid having a purification function by any of physical action and chemical reaction, microbial metabolism and promotion, and high-pressure washing(2)Press-fitting well(3)Forming the press-fit well(3)Nozzle on the wall or bottom of the(5)From the fluid(2)The fluid is ejected at a pressure that controls any of the functions of physical action, chemical reaction, microbial metabolism and high-pressure washing.(2)SaidpollutionStrata(1)Stir inside, wash, pollutants(6)Separated or disassembled,pollutionStrata(1)Undegraded pollutants(6)Fluid containing wells(4)By collecting from the pollutant(6)RemoveA method for purifying a contaminated formation, wherein the fluid (2) is used in a condition that maintains metabolic activity of microorganisms. A first step of press-fitting from the press-fitting well (3), a second step of purifying the contaminated formation by metabolism of the microorganisms, and killing the microorganisms after purification of the contaminated formation is completed in the second step And a third stage for press-fitting the fluid (2) from the press-fitting well (3) by switching to conditions, and the condition for killing the microorganism is realized by ultra-high pressure injection exceeding the living condition of the microorganismTo do.
[0025]
  As a result, the contaminants that are entangled with clay or silt or mudstone fine particles that are constituent particles of the formation are controlled in a suitable state for any function of physical action, chemical reaction, microbial metabolism, and high-pressure washing. It can be detoxified.
[0026]
  Bioaugmentation that injects single or limited types of microorganisms into the ground at an unusually high density that would not be possible in normal ecosystems, in line with the purpose of purifying contaminated formations Even if it is implemented, there is no concern about adverse effects on the ecosystem.
[0027]
  In addition, since the conditions for killing the microorganisms were realized by ultra-high pressure injection exceeding the living conditions of the microorganisms, a technique related to a contaminated formation purification method in situ using ultra-high pressure injection and its apparatus, The objective can be achieved within the scope of the facility or on its extension.
[0028]
  Invention according to claim 2In addition to the contaminated formation purification method according to claim 1,Fluid having the purification function(2)Recovery well to recover(4)And the injection port(5)The press-fit well that can move up and down(3)Are formed by drilling with an appropriate interval, and the press-fitting well(3)And the recovery well(4)And exchange the role of press-fitting and recovery with rotation as appropriate, and contaminate with heavy metals(6)Well and / or its neighboring wells that are determined to remain are filled with ion exchange material and adsorbent material.
[0029]
  Specific ion exchange materials and adsorbent materials include zeolite, allophane, imogolite and activated carbon. Since these ion exchange materials and adsorbing materials have a function of adsorbing harmful substances such as heavy metals, pollutants such as heavy metals are incorporated into the ion exchange materials and adsorbing materials and have an action of sealing off heavy metal poisons.
[0030]
  Since it did in this way, also when using the method which press-fits the said fluid from one well and collect | recovers from another well, it can purify | clean at a high level evenly with respect to a wide contaminated formation. In addition, the contaminants caused by heavy metals can be fixed and purified in the contaminated formation.
[0031]
  Invention according to claim 3In addition to the contaminated formation purification method according to claim 1 or claim 2,At least one of an ion exchange material and an adsorbing material and a heavy metal mineral forming solution is used as the fluid.(2)By mixing in, the contaminants caused by heavy metals can be fixed and purified in the contaminated formation.
[0032]
  Invention according to claim 4In addition to the contaminated formation purification method according to any one of claims 1 to 3,The fluid(2)As the press well, a liquid pressurized to a range of 20 to 500 MPa and / or a gas pressurized to a range of 0.1 to 1.0 MPa is used.(3)Press fit inside.
[0033]
  Since it did in this way, even if it is clay or a silt or a mudstone contaminated formation which fluid cannot penetrate easily, a clay or a silt or a mudstone layer is broken into flakes with the liquid pressurized in the range of 20-500MPa. Since uniform fine particles are formed, the fluid can be permeated, stirred and washed.
[0034]
  In the case of a VOCs-contaminated formation, if the gas is pressurized to a range of 0.1 to 1.0 MPa, it is mixed with the groundwater in the formation to form bubbles, which are infiltrated and stirred with sparsing. The effect of washing is enhanced, and the bubbles lift untreated contaminants together with the liquid toward the ground, so that it is easy to perform a detoxification process.
  In addition, gas is mixed in order to promote the functions of the physical action, chemical reaction, microorganism metabolism, and high-pressure washing.
[0035]
  Invention according to claim 5In addition to the contaminated formation purification method according to any one of claims 1 to 4,Recovery well(4)From the fluid with a negative pressure pump(2)SuckDolikedid. In this wayBy depressurizing the inside of the contaminated formation around the recovery well, volatile contaminants such as VOCs are volatilized from the contaminated formation, making it easy to perform a detoxification process.
[0036]
  Invention concerning Claim 6In addition to the contaminated formation purification method according to any one of claims 1 to 5,The contaminated formation(1)And contaminated groundwater(22)To the fluid(2)Inject and wash at high pressureAs a result, the level of contaminated groundwater is pushed down to a deeper level. In the case of VOCs-contaminated strata that have been submerged before purification, the contaminated strata will be exposed to the air. Moreover, it can be purified more efficiently.
[0037]
  Invention according to claim 7In addition to the contaminated formation purification method according to any one of claims 1 to 6,Recovery well(4)The fluid recovered from(2)Detoxified, and the detoxified fluid(2)Recycle some or all ofAs a result, the total amount of fluid used can be saved. In this case, the amount of the chemical substance or microorganism used to maintain the functions of the physical action, chemical reaction, microorganism metabolism, and high-pressure washing is also reduced, so that the cost can be reduced. Further, if the fluid is circulated in a closed loop, it is difficult to diffuse secondary environmental pollution.
[0038]
  Claim 8In addition to the contaminated formation cleaning method according to claim 7,Recovery well(4)The fluid recovered from(2)DetoxifyProcessAs pollutant adsorption by activated carbonThe process and / or aeration process was used togetherTherefore, the efficiency can be improved by applying the existing technology to operate the existing management resources efficiently. Therefore, the burden on those who are engaged in environmental purification is reduced.
[0039]
  Claim9Inventions related toIs a contaminated formation purification system used in the contaminated formation purification method according to any one of claims 1 to 8, wherein the pressurized fluid (2) is injected into the injection well (3). And an injection port in which the fluid (2) press-fitted by the ultra-high pressure pump (7) is opened in the underground wall inside the press-fit well (3) in the contaminated formation (1) A metal tube rod (31) that rotates while squirting fluid (2) from (5), a recovery well (4) formed by drilling at a predetermined interval from the press-fit well (3), and the recovery A vacuum pump (51) for sucking and pumping fluid (2) from the well (4);As means for detoxifying the fluid (2) recovered from the recovery well (4), a contaminant adsorbing means and / or aeration means by activated carbon was provided.
[0040]
  Invention according to claim 10In addition to the contaminated geological purification system according to claim 9,Because it has a fluid storage tank to circulate and use part or all of the fluid (2)If the fluid is circulated in a closed loop, it is difficult to diffuse secondary environmental pollution.
[0041]
  According to the invention which concerns on Claim 8, Claim 9, and Claim 10, efficiency can be improved by using the existing purification equipment and technology together. In other words, existing purification equipment and technologies can be used together to reduce the burden on those engaged in the purification of polluted environments that are positioned as a global social urgent matter. As a result, it is possible to efficiently operate limited management resources, purify contaminated strata, and protect the global environment.
[0042]
  Invention concerning Claim 11In addition to the contaminated geological purification system according to claim 9 or claim 10,Recovery well(4)Absorber provided on the wall or bottom of(8)From the contaminated strata(1)Through the injection port(5)The distance to was set in the range of 0.5-5.0mTherefore, it can be purified efficiently with a small number of wells.
[0043]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0044]
  FIG. 1 is a schematic cross-sectional view of a contaminated formation that explains the basic embodiment. In the contaminated formation 1, a press-fitting well 3 for press-fitting a fluid 2 having a function of purifying by physical action and chemical reaction and microbial metabolism, which will be described later, and a recovery well 4 for recovering the fluid 2 are set at predetermined intervals (see FIG. 3). And formed by drilling. The fluid 2 is mainly composed of two phases of water and air, and a contaminated formation 1 in which a third cleaning medium is added in addition to water as the first cleaning medium and air as the second cleaning medium. Purification methods and devices have been developed.
[0045]
  The fluid 2 is injected from the injection port 5 provided on the wall surface in the press-fitting well 3 at a pressure that controls physical action, chemical reaction, and metabolic function of microorganisms, and penetrates into the contaminated formation 1 to penetrate the contaminated formation 1. Stir and wash to separate the contaminant 6 from the contaminated formation 1. 60-210 L (liter) / min of water pressurized to 20-200 MPa by the ultrahigh pressure pump 7 and 300 m pressurized to 0.5-0.5 MPa^Three/ H air constitutes the fluid 2, and the fluid 2 is pressed into the press-in well 3 by the pressure, thereby achieving the object even if the contaminated formation 1 is clay, silt or mudstone. The pressure and amount of these fluids 2 are appropriately set according to the physical properties of the contaminated formation 1, that is, the constituent particles / consolidation degree, the groundwater, and the type of the contaminant 6.
[0046]
  In addition, for geological contamination by heavy metals, the contaminants caused by heavy metals can be reduced by “mixing at least one kind of ion exchange material and adsorbing material and heavy metal mineral forming solution into the fluid” as defined in claim 3. It can be fixed and purified in the contaminated formation. Specifically, at least one of zeolite, allophane, imogolite, activated carbon, and a silicate alumina solution known as a heavy metal mineral forming solution is mixed in the fluid 2 and used. Since these ion exchange materials and adsorbing materials have a function of adsorbing harmful substances such as heavy metals, pollutants such as heavy metals are incorporated into the ion exchange materials and adsorbing materials and have an action of sealing off heavy metal poisons.
[0047]
  That is, even if it is a clay, silt or mudstone layer that cannot normally penetrate the fluid 2, the fluid 2 is put into the contaminated formation 1 that has been loosened due to the destruction of the structure by the action of stirring and washing with the ultra-high pressure jet water 20. Can penetrate. Further, in the case of VOCs geological contamination or the like, purification is promoted by injecting the fluid 2 at a pressure that exerts the above-mentioned air sparsing effect by controlling the physical action and chemical reaction and the metabolic function of microorganisms. The “heavy metal mineral forming solution” defined in claim 3 refers to an alumina silicate solution or the like.
[0048]
  In addition, the high-pressure delivery pipe of the ultrahigh-pressure pump 7 is airtightly connected to the injection hole 30 located in the ground portion of the press-fitting well 3. The pressure of the ultrahigh pressure pump 7 and the components contained in the fluid 2 can be appropriately adjusted by a control panel (not shown). The rod 31 of the metal pipe inside the press-fitting well 3 is well known for boring, and the injection port 5 is rotated along with the perforation rotation of the rod 31 with the injection port 5, and the sprinkler action The effect of stirring and cleaning the high-pressure jet water 20 is enhanced.
[0049]
  And the contaminant 6 is removed by collect | recovering the fluid 2 containing the component which is not detoxified among the contaminants 6 from the collection | recovery well 4. FIG. Purified cleaning by physical action, chemical reaction, and metabolism of microorganisms by spraying ultra-high pressure water 20 from the injection port 5 opened in the underground side wall of the rod 31 of the press-fitting well 3, and stirring and cleaning the contaminated formation 1 Support and control functions. Here, the pollutant 6 is removed from the polluted formation 1 by collecting the fluid 2 containing the components that are not detoxified among the pollutants 6 from the polluted formation 1, and the harmful substances are used in the ground equipment (FIG. 4) described later. And innocuous substances can be separated.
[0050]
  Note that VOCs that are underwater in the contaminated formation 1 below the groundwater surface are less likely to volatilize, so only the shallower area of the contaminated formation 1 than the groundwater surface is purified, and the deepest part of the recovery well 4 There was a waste that all of the above could not be used effectively. Therefore, there is contaminated groundwater 22 in the contaminated formation 1, and there is no air in the saturated region below the normal groundwater level 22a. When the two-phase fluid 2 is injected from the injection well 3, the injection well is caused by the pressure of the gas. A purification function can be exerted on the unsaturated region up to the depressed groundwater level 22b with 3 as the center. That is, by washing the contaminated formation and the contaminated groundwater by injecting the fluid at a high pressure, the level of the contaminated groundwater is pushed down to a deeper level, so that the VOCs contaminated formation that has been submerged before the purification is exposed to the air. In other words, it is possible to purify more efficiently in a broader range down to a lower level.
[0051]
  FIG. 2 is a schematic cross-sectional view of the contaminated formation 1 suitable for the present embodiment. Well-known methane-utilizing bacteria 21 live in the formation containing methane gas, and harmful substances 6 existing in the contaminated formation 1 including the contaminated soil 10 on the surface layer are rendered harmless by the metabolic action of the methane-utilizing bacteria 21. It is known that not only the methane-utilizing bacteria 21 but also certain microorganisms detoxify the harmful substances 6 by their metabolic action. For example, by adding a certain microorganism to the breeding water of an aquarium (not shown) for breeding tropical fish, etc., and purifying the breeding water by the metabolic function of the microorganism, and the principle similar to the sewage purification layer using microorganisms A method for detoxifying the pollutant 6 is well known, and the principle of purification is the same.
[0052]
  In addition, it is obvious that human beings can inhabit healthy because of the normal functioning of the natural purification system on a global scale that includes methane-utilizing bacteria 21 and other microorganisms and ecosystems of animals and plants. The gist of the present invention is that the natural purification system of a scale is limited to the locally contaminated formation 1 and the purification is performed efficiently.
[0053]
  Here, the fluid 2 is pressurized to a pressure that appropriately controls the metabolic function of the methane-utilizing bacteria 21 by the ultrahigh pressure pump 7 (see FIG. 1), and penetrates into the contaminated formation 1 from the press-in well 3 as the ultrahigh pressure spray water 20. Then, the contaminated formation 1 is agitated and sprayed so as to support the growth and metabolism of the methane-utilizing bacteria 21 to increase the purification efficiency. The pressure of the ultra-high pressure water 20 means “the pressure that controls any function of physical action and chemical reaction, metabolism of the microorganism, promotion thereof, and high-pressure washing” as defined in claim 1.
[0054]
  In FIG. 2, the contaminated groundwater 22 contained in the contaminated formation 1 is collected in the recovery well 4 and circulated as it is in the fluid 2 as the cleaning medium. The fact that the contaminated groundwater 22 contains natural methane-utilizing bacteria 21 is used as it is. However, if the natural methane-utilizing bacteria 21 is insufficient, the methane-utilizing bacteria 21 is artificially removed from the fluid 2. It may be added to. Further, a gas or nutrient that promotes the growth of the methane-utilizing bacteria 21 and promotes metabolism may be added to the fluid 2. FIG. 2 shows a form in which the natural purification system already provided in the natural state is limited to the locally contaminated formation 1, and the purification is accelerated and carried out efficiently. It is put to practical use by adding a well-known means for promoting it.
[0055]
  In the following, embodiments relating to bioaugmentation that can be accepted by the public will be described.
Where the claim1The basis for executing the “first stage of press-fitting the fluid from the press-fit well under the condition for maintaining the metabolic activity of the microorganism and the second stage of purifying the contaminated formation by the metabolism of the microorganism” defined below Street.
For methane-utilizing bacteria, high-pressure injection of 100 MPa or higher showed a decrease in growth ability and an activity responsible for degradation of pollutants, a decrease in the activity of methane oxidase, and the condition for maintaining metabolic activity was shown to be 40 MPa. . Also,At a high pressure injection of 350 MPa or more and a hydrostatic pressure of 400 MPa or more, there was a marked decrease in the growth ability of methane-utilizing bacteria and a significant decrease in the activity of enzymes responsible for degrading pollutants and methane oxidase.
  Therefore, if the methane-utilizing bacteria are injected at a high pressure at a pressure of 40 MPa or less, the condition for maintaining the metabolic activity of the microorganism is satisfied, so “the first step of injecting the fluid from the injection well”Clean up contaminated strataThe second stage ”can be performed.
[0056]
  Next, in the second stageAfter the purification of the contaminated formation is completed, “a condition for killing only the microorganisms” is preferable in the “third stage in which the fluid is pressed from the press-fitting well by switching to the conditions for killing the microorganisms”. If high-pressure injection is performed at a pressure of 400 MPa or more, most of the methane-utilizing bacteria are killed.Therefore, the third stage can be executed. It should be noted that other methods not currently established may be used as long as they are “conditions for killing the microorganisms without causing secondary contamination”.
[0057]
  further,As defined in claim 1, the methane resources contained in the fluid recovered from the recovery well are defined as “the conditions for killing the microorganisms are realized by ultra-high pressure injection exceeding the living conditions of the microorganisms”. After switching to the ultra-high pressure injection setting at a pressure of 400 MPa or more at which the germicidal bacteria are killed, re-injection from the press-in well is performed.
[0058]
  If bioaugmentation is carried out in this way, there is no concern about adverse effects on the ecosystem, so public acceptance is obtained.
Moreover, the object can be achieved within the scope of the technology and equipment related to the in situ contaminated formation purification method and apparatus using ultra-high pressure injection, or on its extension line.
[0059]
  It should be noted that VOCs that are underwater in the contaminated formation 1 deeper than the groundwater surface are less likely to volatilize, but are washed by injecting ultra-high-pressure jet water 20 containing air around the press-in well 3. As a result, the contaminated formation 1 is agitated in the form of flakes, and the water level of the contaminated groundwater 22 is pushed down to a deeper level as indicated by the groundwater level 22b pushed down at high pressure.
  Therefore, VOCs that have been submerged in the groundwater and cannot be volatilized before the purification are also exposed to the air, and can be purified more efficiently in a wider range and deeper.
[0060]
  FIG. 3 is a schematic diagram showing the arrangement of the press-fit well 3 and the recovery well 4. The press-in well 3 and the recovery well 4 are formed from the ground 100 by drilling (boring or the like) with appropriate intervals. Further, the injection well 3 and the recovery well 4 are respectively connected to ground equipment (see FIG. 4) (not shown) through the ground and an injection hole 30 and an extraction hole 40. Further, the distance from the injection port 5 provided on the wall surface or bottom of the metal tube rod 31 (see FIGS. 1 and 4) constituting the press-fit well 3 to the absorption port 8 provided on the wall surface or bottom of the recovery well 4 D is set in the range of 0.5 to 5.0 m. The distance D is appropriately adjusted depending on the permeability of the fluid 2 to the contaminated formation 1. That is, the distance D is long and the pressure of the fluid 2 is relatively low if it is a sand layer with good permeability. On the contrary, in the case of clay, silt or mudstone formation with low permeability, the distance D is set short and the pressure of the fluid 2 is set to be considerably high.
[0061]
  If the fluid 2 is water and air, bubbles are included by forming a nozzle shape (not shown) that is supplied to the injection port 5 in a pressurized state and appropriately mixed at the injection port 5. Since the ultra-high pressure water 20 (FIGS. 1 and 2) is generated, it has a destructive action accompanied by a sparsing phenomenon, and exhibits a high cleaning effect even for clay, silt or mudstone layers with poor permeability.
[0062]
  As an example, the absorption port 8 provided on the wall surface of the metal pipe constituting the recovery well 4 forms a screen (filter shown in FIG. 8) by a large number of slit holes having a width of 2 mm × a length of 150 mm. If the pressure difference between the front and rear of the screen 47, that is, if the outside of the metal tube is high and the inside is low, the fluid 2 can pass and the clogging prevention sand 44 between the wall of the well hole and the screen 47 (see FIG. 8) prevents unnecessary earth and sand from entering the recovery well 4. Therefore, earth and sand do not fill the well and make it unusable. In addition, it is desirable to select the screen form appropriately depending on the state of the formation.
[0063]
  Figure 4System (plant)It is a schematic diagram showing the configuration, in the location of the contaminated formation 1systemIf the purpose of purification is achievedsystemAnd move to another sitesystemIn-vehicle transport for repeated usesystemIt is. Hereinafter, the configuration, operation, and effect will be described together.
[0064]
  The injection well 3 and the recovery well 4 are drilled by a boring device 50 using a metal pipe. As described with reference to FIG. 1, the rod 31 that constitutes the press-in well 3 with a metal tube rotates in a ground shape like a sprinkler by the sprinkler action of the ultrahigh-pressure water 20 that is injected from the underground injection port 5. Give the effect of stirring to 1 and washing.
  Although the boring device 50 is connected only to the press-fit well 3, the boring device 50 is also connected to the recovery well 4 in the same manner so that it can be used for any of observation, recovery and press-fitting. Drilled. And since it is necessary to rotate the rod 31 only when it is used as the press-fit well 3, it is driven by being connected to the boring device 50. However, when it is used as the recovery well 4 or the observation well, when the well for that purpose is completed The boring device 50 is removed from the well.
[0065]
  The recovery well 4 is connected to the recovery mother pipe 41 via a switchable connection valve 42 without opening the extraction hole 40 on the ground, and if a measuring instrument (not shown) is connected, the degree of contamination can be measured. You can also. The recovery mother pipe 41 is sucked by the vacuum pump 51 to pump the fluid 2 recovered without leakage from the plurality of recovery wells 4 to a notch tank 52 with a lid (not shown in FIG. 4). Of the contaminated water in which the contaminant 6 (FIG. 1) is taken in by the cleaning action and the fluid 2 containing the contaminated gas such as VOCs, the contaminant 6 is precipitated in the two-tank notch tank 52 for the contaminated water. Can also be removed. After the contaminants 6 are roughly precipitated in the first tank, the supernatant that has passed through the V-shaped notch from the first tank and accumulated in the second tank is precipitated in the same manner, and the supernatant of the second tank is aerated. You may make it send to the apparatus 53. FIG. In that case, it is more effective if an appropriate precipitant is added to the notch tank 52.
[0066]
  In the notch tank 52, the flow rate of the liquid passing through the V-shaped notch is measured at the water level of the notch, and an aqueous solution containing harmful substances such as VOCs is continuously fed into the aeration device 53, and is made harmless by the aeration device 53. It is processed. A harmful gas containing VOCs and the like separated by the aeration device 53 during the detoxification process is detoxified by the activated carbon adsorption tower 55 and then released into the atmosphere. In the case of VOCs contamination, the water detoxified by the aeration device 53 is temporarily stored in a two-tank water tank 54 and is used for circulation.
  It should be noted that the two-tank water tank 54 can perform a precipitation process in which the contaminant 6 is precipitated and removed in the two-tank notch tank 52 or a precipitation process having a higher level of purification action.
[0067]
  The water that was temporarily accumulated in the water tank 54 and secured the amount necessary to continue the continuous operation was pressurized to about 200 Mpa by the ultrahigh pressure pump 7 and simultaneously pressurized to about 0.5 Mpa by the ultrahigh pressure pump 7. A fluid 2 mixed with air and having a high level of energy is injected through an injection hole 30 in an above-ground portion of the injection well 3 through a boring device 50. And it injects to the contaminated formation 1 from the injection port 5 opened to the underground side wall of the injection well 3. At the injection port 5, water and air are respectively supplied to the injection port 5 in a pressurized state, and are appropriately mixed by a nozzle (not shown) of the injection port 5 to produce a high-pressure cleaning effect. Here, the first cleaning medium is water, the second cleaning medium is air, and the third cleaning medium is “the ion exchange substance and the adsorbing substance and at least one of the heavy metal mineral forming solution” according to claim 3. You may make it mix.
[0068]
  The super-high pressure jet water 20 containing bubbles generated in this way has a considerable strata destruction action and cleaning effect on the contaminated formation 1 due to the synergistic effect of the sparsing phenomenon and the sprinkler action. Accordingly, it exhibits a high cleaning effect even on contaminated formations 1 of clay, silt or mudstone that are poorly permeable. In particular, the injected ultra-high pressure jet water 20 and the sparged compressed air come into contact with the contaminant 6 dissolved in the water and the contaminant 6 adsorbed on the soil particles, so that the contaminant 6 is water. It has been confirmed that it has the effect of vaporizing from soil particles and separating and escaping.
[0069]
  Furthermore, because of the high-pressure conditions, the unsaturated zone expands as the groundwater level in the saturated zone falls, and the possible range of pollution purification increases. That is, since VOCs and the like cannot be volatilized when immersed in groundwater, when the groundwater in the contaminated formation 1 is pushed down under high pressure conditions, the VOCs and the like are exposed to air and are vaporized, so that they can be purified efficiently. .
[0070]
  Subsequently, the operation will be described.
  FIG. 5 is a flowchart showing the construction sequence of the purification method for the contaminated formation 1. First, in step S1 for destroying the formation, the formation of the formation is also destroyed by the ultra-high pressure water 20 injected from the injection port 5 of the injection well 3, and the contaminated formation 1 of clay, silt or mudstone is permeable. And the fluid 2 is infiltrated in the state of the ultrahigh pressure water 20. Here, the water pressure is 20 to 200 MPa, and the air is pressurized to about 0.5 to 0.7 MPa, 300 m.^ThreeIt is effective to mix / h. However, it was put into practical use in consideration of economic effectsSystem (plant)However, even if it is possible to inject a water pressure exceeding 400 MPa, it is confirmed at this stage that the destructive effect on the contaminated formation 1 will not be increased for a large amount of cost to forcibly increase special equipment. Has been.
[0071]
  As an example of a good result, when the super-high pressure water 20 is injected from the injection port 5 into the contaminated formation 1 at a flow rate of 20 to 30 L (liter) / min, a saturation zone is artificially formed (S2). . The fluid 2 saturated in the unsaturated zone is artificially excluded from the saturated zone by securing an escape path by the amount of additional injection. If the absorption port 8 of the recovery well 4 is open in the formed saturation zone, the fluid 2 in the saturation zone seeks an outlet at the absorption port 8 and from there through the recovery well 4, the pollutant Since it is discharged to the surface together with 6, it is also recovered from the formed saturation zone. There is a distance D of about 2 m from the injection port 5 to the absorption port 8, and the contaminated formation 1 is purified before the fluid 2 passes through this distance D. The distance D is adjusted according to the physical properties of the contaminated formation 1 and the type of the contaminant 6 and is appropriately set in the range of 0.5 to 5.0 m.
[0072]
  The fluid 2 that has moved from the absorption port 8 to the recovery well 4 is pumped (S3) as the bubbles rise in the recovery well 4 that extends vertically to the ground. Further, a recovery mother pipe 41 in which a plurality of recovery wells 4 are connected on the ground is sucked by a vacuum pump 51 (FIG. 4). Under ultra high pressure purification, the high pressure fluid 2 formed in the unsaturated zone in the contaminated formation 1 is also pumped from the recovery well 4 (S3). In addition, since the volatilization of the volatile substance in the contaminated formation 1 is promoted by the pressure difference between the negative pressure and the ultrahigh pressure of the vacuum pump 51, there is an effect of recovering all residues such as VOCs from the contaminated formation 1.
[0073]
  The fluid 2 containing VOCs collected from the fluid suction port of the vacuum pump 51 is aerated (S4) in the aeration tank 53 and separated into gas containing VOCs and water from which VOCs have been removed. Here, since the pollutant is only VOCs, if it is determined that the fluid 2 has been completely detoxified, it may be discharged / drained (S7). If it is determined that it is more advantageous to use the circulating fluid, the fluid 2 is recycled and reused as the cleaning medium (S8). For example, detoxified water is temporarily stored in the water tank 54 and re-injected into the injection well 3 by the ultrahigh pressure pump 7.
[0074]
  If heavy metal is contained in the water from which VOCs have been removed, detoxification treatment (S5) is performed according to the type of the heavy metal. This detoxification process (S5) is an established technique, and further description is omitted.
[0075]
  On the other hand, when the fluid 2 containing VOCs is aerated by the aeration device 53 (S4), the toxic gas containing VOCs separated from the fluid 2 is toxic in the activated carbon adsorption tower 55 so as not to cause air pollution. The components are adsorbed and removed, detoxified (S6), and then released into the atmosphere (S7).
[0076]
  In addition, in the construction sequence shown in the flowchart of FIG. 5, it is not specified to press-fit a fluid having a purifying function by any one of physical action and chemical reaction, and metabolism and promotion of microorganisms, and high-pressure washing. This assumes the case of the contaminated formation 1 that previously contains the methane-utilizing bacteria shown in FIG. 2, and is premised on the fluid 2 already having a purification function by metabolism of microorganisms.
[0077]
  Here, the substance etc. which comprise the "purification function by any one of the physical action and chemical reaction, and the metabolism of microorganisms, its promotion, and high-pressure washing | cleaning" defined in Claim 1 are illustrated concretely. Nutrient sources for anaerobic methanogenic microorganisms, which are different from the methane-utilizing bacteria described above, include growth nutrient sources for methanogenic microorganisms such as lactic acid, methanol, ethanol, acetic acid, citric acid, pyruvic acid, and polypeptone. As commonly known nutrients.
[0078]
  In addition, as a growth nutrient source for sulfate-reducing microorganisms, nutrients generally known as growth nutrient sources for sulfate-reducing microorganisms represented by lactic acid, methanol, ethanol, acetic acid, citric acid, pyruvic acid, polypeptone, sugar-containing organic substances, etc. It's okay. Furthermore, organic wastewater and waste that are subject to methane fermentation treatment are effective as a source of growth nutrient for heterotrophic anaerobic microorganisms, such as beer brewing wastewater, starch wastewater, dairy wastewater, and sugarmaking wastewater. And beer lees, okara, and sludge.
[0079]
  As the inorganic reducing agent to be added to the fluid 2, for example, reduced iron, cast iron, iron-silicon alloy, titanium alloy, zinc alloy, manganese alloy, aluminum alloy, magnesium alloy, calcium alloy and a water-soluble compound thereof are used. Choose at least one. In the presence of such a reducing agent, reductive halogenation by a combination of physical action and chemical reaction and microorganisms can be promoted.
[0080]
  In particular, the reducing agent preferably contains a large amount of reduced iron or cast iron. Alternatively, the reducing agent is iron-silicon alloy, titanium-silicon alloy, titanium-aluminum alloy, zinc-aluminum alloy, manganese-magnesium alloy, aluminum-zinc-calcium alloy, aluminum-tin alloy, aluminum-silicon alloy, magnesium. -It is preferably at least one selected from the group consisting of a manganese alloy and a calcium-silicon alloy.
[0081]
  The reducing agent may be a salt composed of an organic acid or hypophosphorous acid and iron, titanium, zinc, manganese, aluminum, or magnesium.
Further, the reducing agent is preferably a water-soluble compound because the main component of the fluid 2 as a purification medium is often water.
[0082]
  It should be noted that the amount of reducing agent used should be adjusted in accordance with the state of the pollutant 6, and a preliminary test should be conducted on site to determine the added concentration individually according to the site conditions.
  Moreover, the substance mixed in the fluid 2 does not need to be limited to the reducing agent, and an oxidizing agent is effective. However, a specific description is omitted.
[0083]
  FIG. 6 is a plan view showing the arrangement of multiple wells and their rotation. Moreover, FIG. 7 is a flowchart which shows the construction order which considered the rotation of the well.
6 and 7, the rotation for appropriately exchanging the roles of the press-fit well 3 and the recovery well 4 will be briefly described.
[0084]
  First, wells are drilled (S11) in the order of A, B, C to W, X, and Y in a grid pattern at an interval of 2 m on the ground where the contaminated formation 1 is estimated. At this stage, the soil contamination diagnosis is possible by sampling the contaminated formation 1 using the wells A to Y as observation wells. After drilling to the well Y in the center of the contaminated area, the well Y is turned into a press-fit well 3 (S12). At that time, in the boring device 50, the high pressure jet water 20 is replaced with a rod 31 capable of being press-fitted from a drilling rod (not shown) and connected to the delivery pipe of the ultrahigh pressure pump 7.
[0085]
  In FIG. 6, the wells A to X other than Y are set as the recovery well 4 (S13). The details will be described later with reference to FIG. A measuring instrument is connected to the extraction hole 40 of the recovery well 4, and the component, concentration, distribution, and the like of the pollutant 6 are measured in each well A to X by the fluid 2 to be extracted (S14). The purification method can be optimally set according to the measurement result.
[0086]
  The wells Q, R, S, T, U, V, W, and X in the immediate vicinity of the press-fit well Y are set as the recovery well 4 (S15). However, a typical method is merely illustrated for explaining the rotation.
[0087]
  Next, the press-fit well 3 is rotated from Y to X (S16). Then, the wells P, Q, R, Y, V, W, N, and O in the immediate vicinity of the press-fit well X are made the recovery well 4 (S17).
[0088]
  Further, the press-fit well 3 is rotated to X, W, V, U, T, S, R, and Q (S18). Then, if a predetermined function is performed on the injection well Q and the recovery wells A, B, C, R, Y, X, O, and P corresponding to the injection well Q, purification is incomplete according to the above-described measurement results. The recovery well at the point is made into a press-fit well, and purification is proceeded in the same manner (S19). Furthermore, the achievement degree of purification can be confirmed (S20) based on the measurement results described above. If unsuccessful, complete purification can be achieved by rotating and confirming S12 to S20.
[0089]
  FIG. 8 is a diagram mainly showing details of the recovery well pipe, (a) a columnar estimation schematic diagram, (b) a cross-sectional view, (c) an enlarged view of the screen, and (d) an arrangement view of slits constituting the screen. is there.
[0090]
  As shown in FIG. 8 (a) columnar estimation schematic diagram, when the range of 14 to 42m underground is the contaminated formation 1 and is in a geological state different from the non-contaminated formation 9, as shown in FIG. 8 (b). A metal tube 43 is inserted vertically into the well. On the outer periphery of the metal tube 43, the fine holes formed by the slits 48 shown in FIGS. 8C and 8D constitute the absorption port 8 (FIG. 3) having the function of the screen 47. The screen 47 is set to a metal pipe 43 that extends from the basement 42 to 11 m, and the sand between the outer circumference of the metal pipe 43 and the inner wall of the well is filled with dredged sand No. 2 as clogging prevention sand 44. And the contaminated stratum 1 and the ground surface are kept airtight by packing the water-impervious seal 45 in the underground 11 to 10 m. Backfill 1m underground to the ground surface with backfill soil 46.
[0091]
  If the ground surface is covered with a non-illustrated air packer (air-tight lid) or leveled concrete with a thickness of about 30 cm for the same purpose as the water-tight seal 45, the fluid 2 will not leak. So it is effective.
[0092]
  The metal tube 43 inserted vertically into the well shown in FIG. 8B can be pulled up as necessary. Therefore, in order to realize the well rotation shown in FIG. 6, the recovery well 4 is switched to the press-fit well 3 and vice versa. At that time, the degree of purification at each well is observed, and if it is determined that the purification of heavy metal contamination has not been achieved, the well and / or its well determined to have heavy metal contamination remaining. Near wells are filled with ion exchange material and adsorbent material.
Although not shown in FIGS. 7 and 8, the ion exchange material and the adsorbing material are poured into the metal tube 43 from the ground and filled with powder or granular materials and filled to the bottom of the well. What is necessary is just to extract the metal tube 43 on the ground, and another method may be used.
[0093]
  As specific ion exchange materials and adsorbent materials, zeolite, allophane, imogolite and activated carbon are used. Since these ion exchange materials and adsorbing materials have a function of adsorbing harmful substances such as heavy metals, pollutants such as heavy metals are incorporated into the ion exchange materials and adsorbing materials and have an action of sealing off heavy metal poisons. Since it did in this way, also when using the method which press-fits the said fluid from one well and collect | recovers from another well, it can purify | clean at a high level evenly with respect to a wide contaminated formation. In addition, the contaminants caused by heavy metals can be fixed and purified in the contaminated formation.
[0094]
  And the equipment arrangement | positioning on the ground shown in FIG. 4 respond | corresponds along the procedure shown in FIG. 5 thru | or FIG. In this way, after completely purifying the contaminated formation 1,System (plant)Is completed by, for example, removing and refilling the well.
In addition, contaminants caused by heavy metals are taken into the ion exchange material and adsorbing material to seal off heavy metal poisons. That is, in the case of heavy metals, it does not elute by fixing minerals.
[0095]
【The invention's effect】
  As described above, according to the first aspect of the present invention, the contaminants that are entangled with the particulate clay or silt or mudstone are removed from the physical action, chemical reaction, microbial metabolism, and high-pressure washing. It can be rendered harmless while being controlled to a suitable state.
[0096]
  Also, bioaugmentation that injects single or limited types of microorganisms into the ground at unusually high concentrations that cannot be in normal ecosystems, in line with the purpose of purifying contaminated formations. However, there is no secondary contamination in which the microorganisms grow abnormally, and there is no fear of adversely affecting the ecosystem, so public acceptance is obtained.
[0097]
  And since the conditions for killing the microorganisms are realized by the ultra-high pressure injection exceeding the living conditions of the microorganisms, the technology related to the in situ contaminated formation purification method and apparatus using the ultra-high pressure injection, The objective can be achieved within the scope of the facility or on its extension.
[0098]
  According to the second aspect of the present invention, a wide range of contaminated formations are purified at a high level without unevenness. In addition, the contaminants caused by heavy metals can be fixed and purified in the contaminated formation.
[0099]
  According to the third aspect of the present invention, the contaminants caused by heavy metals can be fixed and purified in the contaminated formation.
[0100]
  According to the fourth aspect of the present invention, even when the clay, silt or mudstone contaminated formation is difficult to permeate the fluid, the liquid pressurized to the range of 20 to 500 MPa heats the clay, silt or mudstone. While breaking, it can penetrate, stir and wash. In addition, if the gas is pressurized to a range of 0.1 to 1.0 MPa, it is mixed with groundwater in the formation and becomes microbubbles due to sparsing, and the effect of stirring and washing is enhanced. Since the processing contaminant is lifted toward the ground together with the liquid, it becomes easy to perform the detoxification process.
[0101]
  According to the fifth aspect of the present invention, by depressurizing the contaminated formation around the recovery well, volatile pollutants are volatilized from the contaminated formation, so that the detoxification process can be easily performed.
[0102]
  According to the invention of claim 6, by injecting the fluid into the contaminated formation at a high pressure, the water level of the contaminated groundwater is pushed down to a deeper level. In the case of a VOCs contaminated formation that has been submerged before purification, etc. In this case, the contaminated formation is exposed to air, and it can be purified more efficiently in a wider range up to a deeper layer.
[0103]
  Claim7 and claim 10According to the invention according to the present invention, if the total amount of the fluid used is reduced, the amount of the chemical substance or microorganism used to maintain the function of any one of the physical action, chemical reaction, microorganism metabolism, and high-pressure washing is also increased. Costs can be reduced because it decreases. Further, if the fluid is circulated in a closed loop, it is difficult to diffuse secondary environmental pollution.
[0104]
  According to the invention which concerns on Claim 8, Claim 9, and Claim 10, efficiency can be improved by using the existing purification equipment and technology together. In other words, in order to reduce the burden on those who purify polluted environments that are positioned as a global social urgent task, the limited management resources can be efficiently used by combining existing purification equipment and technologies. Operate, clean up contaminated strata and protect the global environment.
[0105]
  According to the invention which concerns on Claim 11, it can purify | clean efficiently with few number of wells.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view of a contaminated formation explaining the basic embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view of a contaminated formation suitable for the present embodiment.
FIG. 3 is a schematic diagram showing an arrangement of a press-fit well and a recovery well.
[Fig. 4]System (plant)It is a schematic diagram which shows a structure.
[Figure 5] Contaminated areaLayeredIt is a flowchart which shows the construction order of the purification method.
FIG. 6 is a plan view showing the arrangement of multiple wells and their rotation.
FIG. 7 is a flowchart showing a construction sequence in consideration of well rotation.
FIG. 8 is a diagram mainly showing details of a recovery well pipe, (a) a columnar estimation schematic diagram, (b) a sectional view, (c) an enlarged view of the screen, and (d) an arrangement view of slits constituting the screen.
[SignDescription]
1 Contaminated strata
2 Fluid
3 injection wells
4 recovery wells
5 injection port
6 Pollutants
7 Super high pressure pump
8 Absorption port
10 Contaminated soil
11 Clay layer
20 Super high pressure water
21 Methane-utilizing bacteria
22 Contaminated groundwater
22a Normal groundwater level
22b Groundwater level pushed down
30 injection hole
31 Rod
40 extraction holes
42 Valve
43 Metal tube
44 Anti-clogging sand
45 Waterproof seal
46 Backfill soil
47 screens
48 slits
49 Bottom cover
50 Boring equipment
51 vacuum pump
52 Notch tank
53 Aeration equipment
54 Aquarium
55 Activated carbon adsorption tower
100 ground
D injectionMouthAbsorptionMouthDistance at

Claims (11)

In the contaminated formation (1), a press-fitting well (3) for injecting a fluid (2) having a purification function by physical action and chemical reaction, microbial metabolism, promotion thereof, and high-pressure washing is formed.
The fluid (2) is injected from the injection port (5) provided in the wall surface or bottom of the press-fitting well (3) with a pressure that controls any of the functions of physical action, chemical reaction, microorganism metabolism, and high-pressure washing. And
The jetted fluid (2) stirs and cleans the contaminated formation (1 ) , separates or decomposes the contaminant (6) ,
A contaminated formation purification method for removing the contaminant (6) by recovering a fluid containing undegraded contaminant (6) in the contaminated formation (1) from a recovery well (4) ,
A first step of injecting the fluid (2) from the injection well (3) under conditions that maintain the metabolic activity of the microorganisms;
A second step of purifying the contaminated formation by metabolism of the microorganisms;
A third stage of injecting the fluid (2) from the injection well (3) by switching to a condition for killing the microorganisms after the contaminated formation purification is completed in the second stage,
A method for purifying a contaminated formation, characterized in that the condition for killing the microorganism is realized by ultra-high pressure injection exceeding the living condition of the microorganism . The recovery well (4 ) for recovering the fluid (2) having the purification function and the press-fit well (3) capable of moving up and down the injection port (5) are formed by drilling with appropriate intervals,
The press-fit well (3) and the recovery well (4) exchange the roles of press-fit and recovery by appropriate rotation,
2. The contaminated formation purification method according to claim 1, wherein the well and / or its neighboring well in which the contaminant (6) due to heavy metal remains is filled with an ion exchange material and an adsorbing material. . The contaminated formation purification method according to claim 1 or 2 , wherein at least one of an ion exchange material and an adsorbing material and a heavy metal mineral forming solution is mixed in the fluid (2) . A liquid pressurized to a range of 20 to 500 MPa and / or a gas pressurized to a range of 0.1 to 1.0 MPa as the fluid (2) is pressed into the press-fit well (3) . The contaminated formation purification method according to any one of claims 1 to 3. The contaminated formation purification method according to any one of claims 1 to 4, wherein the fluid (2) is sucked from the recovery well (4) by a negative pressure pump. Contamination strata according to any one of claims 1 to 5, characterized in that washing the contaminated formation (1) and the fluid in the contaminated ground water (22) (2) was injected at a high pressure Purification method. The fluid (2) recovered from the recovery well (4) is detoxified, and part or all of the detoxified fluid (2) is circulated and used. Item 7. The contaminated formation purification method according to any one of Items 6 above. The contaminated formation according to claim 7, further comprising a pollutant adsorption step and / or an aeration step with activated carbon as a step of detoxifying the fluid (2) recovered from the recovery well (4). Cleaning method. A contaminated formation purification system for use in the contaminated formation purification method according to any one of claims 1 to 8 ,
An ultrahigh pressure pump (7) for pressurizing the pressurized fluid (2) into the press-fit well (3);
The fluid (2) injected by the ultra-high pressure pump (7) is injected into the contaminated formation (1) from the injection port (5) opened to the underground side wall inside the injection well (3). A metal tube rod (31) that rotates while being sprayed,
A recovery well (4) formed by drilling at a predetermined interval from the press-fit well (3);
A vacuum pump (51) for sucking and pumping fluid (2) from the recovery well (4);
A contaminated formation purification system comprising a pollutant adsorbing means and / or an aeration means using activated carbon as a means for detoxifying the fluid (2) recovered from the recovery well (4). Contaminated strata purifying system according to claim 9, further comprising a fluid reservoir for recycling part or all of the fluid (2). The distance from the absorption port (8) provided in the wall surface or bottom of the recovery well (4) to the injection port (5) through the contaminated formation (1) is in the range of 0.5 to 5.0 m. The polluted geological purification system according to claim 9 or 10, which is set.

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