JP3567435B2 - Contaminated soil cleaning system and cleaning method using it - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention provides a method for in-situ contaminated soilWashingPurification systemAnd cleaning method using it.
[0002]
[Prior art]
Conventionally, soil contamination by heavy metals such as hexavalent chromium, mercury, and cadmium has been regarded as a problem, but recently, soil contaminated with volatile organic chlorine compounds having carcinogenic properties such as trichloroethylene and tetrachloroethylene. Is a close-up. In treating such soil contamination in situ, as a method of repairing the contaminated soil, a pumping aeration method, a vacuum extraction method, a wet cleaning method, and the like have been implemented. Hereinafter, these conventional methods will be briefly described.
[0003]
The pumping aeration method is a method of treating contaminated groundwater by aerating the pumped contaminated groundwater and treating it as exhaust gas. Further, the contaminated groundwater that has been pumped can be treated by a method such as activated carbon adsorption. This method is extremely ineffective against contamination in clayey materials having poor water permeability, and has a drawback that the target substance cannot be reliably recovered and removed.
[0004]
The vacuum extraction method is a method of forcibly removing a volatile target substance present in an unsaturated layer by suction and performing a pollution treatment. Specifically, a suction pipe is installed by boring, and the target substance vaporized by decompression with a vacuum pump is collected inside the suction, guided to the ground, and the target substance in soil gas is adsorbed and removed by activated carbon for treatment. I do. This method is effective for sandy strata with good air permeability and water permeability.
[0005]
In addition, the wet cleaning method (soil cleaning method) is a method in which contaminated soil is mined, mixed and stirred with a cleaning solution, eluted or ground to separate contaminants from soil particles and treat them. As a conventional method using high-pressure water, a high-performance soil washing method, a jet grout method, a high-pressure injection stirring replacement method, and the like are known. The high-pressure water referred to here means 100 MPa or less, including the maximum pressure of 70 MPa used in the conventional method, and the ultra-high-pressure water refers to 100 to 400 MPa.
[0006]
Specifically, the high-performance soil washing method is a method in which high-pressure water of 70 MPa is applied to the contaminated soil, the contaminated soil is finely crushed to facilitate chemical treatment, and the contaminated material is collided with a plate at a high speed of 190 to 240 km / h. Is separated and the organic substance is rendered harmless again by a chemical reaction. FIG. 3 shows the process of this high-performance soil washing method. In FIG. 3, a portable plant can be loaded on a truck bed and its soilCleaning systemFIG. 3 shows a process flow chart for performing soil washing by reference numeral 30.
[0007]
As shown in FIG. 3, the collected contaminated soil 31 is put into a stirring tank 32, added with a chemical 33 and water supplied from a water treatment device 46, stirred, and then has a cylindrical shape. Input to the preprocessor 34. In the preprocessor 34, the contaminated soil 31 is separated into clay, organic matter, and sand by generating a turbulent flow up and down by high-pressure water (70 MPa) by the high-pressure pump 35, and the fine particles of the contaminated soil 31 react with the chemical 33. Next, the contaminated soil 31 is thrown into the collision chamber 36 and collides with the reflecting plate 36a provided therein at a high speed of 190 to 240 km / h, and the contaminated soil 31 of 70 μ or less is directed downward. The stabilizing chemical 38 is added to the fallen contaminated soil 31 for stabilization.
[0008]
Here, when the contaminant is a volatile organic compound, PCB, oil, or dioxin, the contaminant is conveyed to the cavitation unit 39 and supplied with hydrogen peroxide (H2O2). In the cavitation unit 39, the contaminants are rendered harmless by a reaction effect between the cavitation phenomenon and the OH group. The contaminants detoxified by the cavitation unit 39 are dehydrated by the centrifugal separator 41 and carried out as reclaimed soil 42. On the other hand, when the contaminant is a heavy metal, the contaminant is dehydrated by the centrifugal separator 43 and carried out as recycled soil 44. centrifuge41, 43The water separated by is collected by the water treatment device 46 and reused. Since this high-performance soil washing method can be used as a portable plant, quick on-site treatment can be performed.
[0009]
Jet grouting method is mainly for earthquakebyThis method is used to strengthen the soft formations in preparation for the liquefaction phenomenon.The monitor is attached to the tip of a multi-tube rod and rotates while spraying high-pressure water or cement-based hardener simultaneously with compressed air in the horizontal direction. By raising the monitor, a columnar body having an average diameter of 2 m is formed in the formation. The jet grouting method includes a 12JSG method and a column jet grouting method.
[0010]
Fig. 4 shows the soil used in the 12JSG methodCleaning systemIt is sectional drawing which shows 50. As shown in FIG.Cleaning system50 rotates a blade bit 52 provided at the tip of a double pipe (rod) 51 extending from the ground to the contaminated soil 54 to cut the stratum. Further, high-pressure water of 20 MPa is supplied to the inner pipe of the double pipe 51, and when the stratum is cut by the blade bit 52, the high-pressure water is jetted. Therefore, the contaminated soil 54 becomes a fluid semi-solid fluid, and slime 55 is formed around the double pipe 51. The slime 55 is pumped by, for example, a vacuum truck (not shown) on the ground.
[0011]
Figure 5 shows the soil used in the column jet grouting methodCleaning systemFIG. As shown in FIG.Cleaning systemAt 60, a triple pipe as a rod 61 extends from the ground to the contaminated soil 67. The high pressure water of 40 MPa is supplied to the inner pipe of the triple pipe, and when the rod 61 rotates and cuts the formation, the high pressure water is injected into the formation from the nozzles 63 and 64. Therefore, the contaminated soil 67 becomes a fluid semi-solid fluid (slime 66). The slime 66 is pumped by, for example, a vacuum truck (not shown) on the ground.
[0012]
The high-pressure jet stirring and displacement method destroys and contaminates the contaminated stratum with the powerful energy of high-pressure water, collects the fluidized contaminated soil on the ground, and fills a considerable amount of the collected hardener liquid with a high-pressure pump to contaminate the soil. This is a method of replacing with soil. This method applies the grout method to soil purification and is almost the same as the above-described 12JSG method.
[0013]
Fig. 6 shows the soil used in the high-pressure injection stirring replacement method.Cleaning systemFIG. As shown in FIG. 6, the contaminated soil 76 is cut, crushed, stirred, and fluidized by a high-pressure hardener (cement milk) injected from rotary injection nozzles 72, 74 inserted into the ground. The fluidized contaminated soil is sequentially discharged to the ground along a double pipe 71 extending from the ground to the contaminated soil 76. On the other hand, since the injected hardener liquid (cement milk) has a high specific gravity, it is separated from the agitated contaminated soil and contaminated groundwater, and then sedimented and solidified at the bottom in order, and piled alternative soil (diameter 1. 2-2.0 m) to be replaced by contaminated soil.
[0014]
[Problems to be solved by the invention]
However,In the conventional method, it is necessary to install a shielding wall using a shielding plate. In particular, in the case of contaminated soil having a vast area spread over a large area, it has been a problem to reduce the cost required for installing the shielding wall, shorten the construction period, and efficiently collect the sludge water.
Furthermore, the conventional construction method has a problem that the treatment efficiency is low in a clay or silty stratum having a strong adhesive force due to low water permeability and air permeability..
[0015]
Therefore, the present inventionConventional contaminated soil cleaning system and cleaning method using itIt was invented to solve the problems ofEliminates the need to install shield walls with shield plates,Expanding processing capacity independent of geological conditionsContaminated Soil Cleaning System and Cleaning Method Using ItThe task is to provide
[0016]
[Means for Solving the Problems]
Claim 1The invention according to the present invention relates to an injection hole 2 for injecting ultra-high pressure water into the drilled contaminated soil, and a sludge water in which the contaminated soil is washed by driving a pipe having a large number of holes formed in the outer periphery around the injection hole 2 Points 9 and 9, a rod 12 for super high pressure water injection inserted into the injection hole 2, and ultra high pressure water injection nozzles 12h and 12i for jetting the ultra high pressure water near the tip of the rod 12. And a super high pressure water injection pump 3 capable of pressing ultra high pressure water in a range of 100 MPa to 400 MPa into the rod 12, wherein the well points 9, 9 are located around the injection hole 2. Wherein the number of castings is proportional to the area of the contaminated soil, and the contaminated soil is deeper than the contaminated soil.
[0017]
According to the first aspect of the present invention, it is stretched around the injection hole 2 and struck deeper than the contaminated soil. The provided well points 9, 9 suck up the sludge water having washed the contaminated soil from the periphery of the injection hole 2 without any leakage, so that there is no need to install a shielding wall using a shielding plate as in the conventional method. In particular, in the case of contaminated soil having a huge volume developed over a large area, the effects of reducing costs and shortening the construction period are remarkable, and sludge water can be efficiently collected.
[0018]
The invention according to claim 2 is a compressed air injection nozzle 12j that injects compressed air around the ultra high pressure water injected from the ultra high pressure water injection nozzle 12i, the ultra high pressure water injection nozzle 12i and the compressed air injection nozzle. 2. The contaminated soil cleaning system according to claim 1, further comprising: a monitor 15 provided at a distal end of the rod 12 including double nozzles 13 and 14 formed of 12 j.
[0019]
According to the invention according to claim 2, a double nozzle composed of a compressed air injection nozzle 12j for injecting compressed air around the ultrahigh pressure water injected from the ultrahigh pressure water injection nozzle 12i and an ultrahigh pressure water injection nozzle 12i From 13 and 14, an air-fuel mixture jet which mixes and injects compressed air is injected.
In this mixed jet, the air covers the jet jet, the frictional force with the surrounding water is reduced, and the range is extended several times.
Therefore, in a contaminated soil cleaning system in which compressed air is injected around the ultra-high pressure water, a processing capacity two to three times or more than that of the conventional system can be obtained.
[0020]
The invention according to claim 3 uses the contaminated soil cleaning system according to claim 1 or 2.A method of cleaning contaminated soil,
(1) drilling holes in the contaminated soil,2A first step of forming
(2) The injection hole2Multiple well points around9,9A second step of casting
(3) The injection hole2100-400MPa ultra-high pressure water is sprayed on the contaminated soil where the temperature is increased by impact energy, the contaminated soil is cut, and the contaminants contained in the contaminated soil particles are converted into sludge water.9,9The third step of pumping water from
(4) Aeration device for sludge water7And a fourth step of volatilizing by aeration treatment
(5) a fifth step of decomposing and / or adsorbing the volatile contaminants;
It is characterized by including each step of.
[0021]
According to the method for cleaning contaminated soil according to the third aspect, the same operation and effect as those of the first or second aspect can be obtained.
[0022]
The method for cleaning contaminated soil according to claim 4, wherein a viscous substance containing a high molecular polymer and / or an additive containing a surfactant are mixed into the ultrahigh-pressure water. This is a soil cleaning method.
[0023]
According to the method for cleaning contaminated soil according to the fourth aspect, by mixing a viscous substance such as a polymer, the convergence of the jet jet is improved and the cutting distance is extended, so that the processing capacity is further increased. Can be.
Further, by mixing an additive such as a surfactant, the permeability is improved as the surface tension is reduced, so that the purification is promoted.
[0024]
The reason why the ultra-high-pressure water is not set to 400 MPa or more in the present invention is that the cost performance is degraded because the cost for upsizing and maintenance of the apparatus is required for the effect.
[0025]
Disclosed in the present invention,Utilized ultra high pressure water (100-400MPa)Contaminated soil cleaning system and cleaning method using itAs a result, the following effects are obtained that cannot be obtained by the conventional soil cleaning method using high-pressure water.
1.There is no need to install a shielding wall with a shielding plate found in the conventional method. In particular, in the case of contaminated soil having a huge volume developed over a large area, the effects of reducing costs and shortening the construction period are remarkable, and sludge water can be efficiently collected.
2.In-situ treatment is possible by minimizing the transport of contaminated soil, and water jetting and jetting with ultra-high pressure water using ultra-high pressure water can improve water permeability and air permeability, expanding processing capacity. it can.
3.It is possible to cope with clay or silty stratum, which is not good at the conventional construction method, which has strong adhesive strength, and it is possible to treat without depending on geological conditions.
4.The impact energy at the time of injection generated by the ultra-high pressure water converts the impact energy into heat energy and raises the temperature of the sludge water, so the separation efficiency of pollutants is much higher than the high pressure water seen in the conventional method. In addition, VOCs, oils, heavy metals, and the like adsorbed on soil particles can be easily separated and recovered efficiently.
5. Also,As the dispersion of soil particles and the separation and separation of contaminants progress, the substances strongly adsorbed on soil particles, such as volatile organic chlorine compounds and oil, which were difficult to separate and separate with high-pressure water using the conventional method, are effectively used. It can be stripped, separated and dissolved to facilitate subsequent processing.
[0026]
BEST MODE FOR CARRYING OUT THE INVENTION
(1st Embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, a case will be described in which a contaminated soil due to a volatile organic chlorine compound (VOC) such as trichloroethylene or tetrachloroethylene, which is one of the top priorities in environmental protection, is repaired. In the present invention,PertainContaminated soilWashingPurification systemAnd cleaning method using itIs not only applied to the case where the soil contaminated by the volatile organic chlorine compound is repaired, but can also be appropriately applied to the case where the soil contaminated by other contaminants is repaired.
[0027]
First, the present inventionPertainContaminated soilWashingPurification system(Hereinafter also referred to as "soil cleaning system") and cleaning method using itTo do the soilCleaning systemWill be described. Figure 1 shows the soilCleaning systemFIG. 1A is a cross-sectional view showing the arrangement of injection holes and well points taken along the line AA shown in FIG. 1B, and FIG. 1B is a diagram showing soil used.Cleaning systemFIG. 2 is a vertical sectional view taken along line BB shown in FIG. FIG. 2 (a) shows the soilCleaning systemFIG. 2B is a cross-sectional view of the upper end of the rod of FIG.Cleaning systemIt is sectional drawing of the rod lower end part.
[0028]
As shown in FIG.Cleaning system1, on the ground,Ultra high pressure water injection pump 3When,This ultra high pressure water injection pump 3, An air compressor 5 for feeding compressed air to a rod 12 described later, a driving device 6 for driving the rod 12, and a water feeding device 11 for feeding sludge water sucked from the ground. And an aerator 7 for aerating and volatilizing volatile pollutants contained in the sludge water supplied by the water feeder 11 and a treating device 8 for adsorbing the contaminants volatilized by the aerator 7. I have. As shown in FIG. 1B, a rod 12 is inserted into an injection hole 2 drilled by an excavator, and an air packer 2a, which is a plug for preventing backflow, is inserted into the insertion hole. Are located. As shown in FIG. 1 (a), a plurality of well points (WP) arranged and arranged at regular intervals and in a grid pattern around the vertically arranged ultra-high pressure water injection rod 12 are arranged. ) 9, 9 ... Hereinafter, details of each unit will be described.
[0029]
Ultra high pressure water injection pump 3Generates ultra high pressure water 5 to 10 times that of conventional high pressure water. The maximum discharge pressure is 400 MPa, and a triple plunger pump driven by an engine, a servomotor driven type, or the like is used.
[0030]
The ultra-high pressure hose 4 is a flexible hose made to withstand ultra-high pressure, and for example, a nylon hose can be used. The ultrahigh pressure hose 4 is not limited to nylon, but may be any material having both durability and flexibility. The driving device 6 gives a rotary motion and a vertical motion to a swivel 12 s located at an upper end portion of the rod 12 to be excavated (see FIG. 2A).
[0031]
The well point 9 is a pipe having a cylindrical shape for sucking up sludge water, and has a number of holes formed on the outer periphery. As shown in FIG. 1A, the well points 9, 9,... Are arranged in a grid pattern around the injection holes 2. The well point 9 has a role of a straw for sucking up the sludge water that has washed the contaminated soil. In addition, you may divert an investigation hole as an injection hole. The number of well points 9 to be placed is proportional to the area of the target contaminated soil, but in many cases it can be as large as 300 to 400. The casting depth of the well point 9 is deeper than the contaminated soil. Therefore, there is no need to install a shielding wall using a shielding plate as seen in the conventional method. HugeEnormous in areaIn the case of a large volume of contaminated soil, the installation of a shielding wall is unnecessary, so that the cost can be reduced, the construction period can be shortened, and the sludge water can be collected efficiently.
[0032]
As shown in FIG. 2A, rotation and vertical movement of the swivel 12 s located at the shaft end (ground portion) of the rod 12 are transmitted by the driving device 6. The rod 12 has a triple structure, and includes a first tube 12a, a second tube 12b, and a third tube 12c from the center. Ultra high pressure water is supplied to the first pipe 12a from an ultra high pressure water inlet 12d provided at the uppermost end of the swivel 12s. Compressed air is supplied to the second pipe 12b from a compressed air inlet 12e provided in the middle stage of the swivel 12s. Further, ultra high pressure water is supplied to the third pipe 12c from an ultra high pressure water inlet 12f provided at the lower end of the swivel 12s.
[0033]
As shown in FIG. 2B, the tip (underground portion) of the rod 12 is screwed with a carbide bit 12g at the tip. The vicinity of the bit 12g is called a monitor 15. The monitor 15 has a plurality of super highPressure jetThe injection nozzles 12h and 12i are formed, and the ultra-high-pressure water supplied from the ultra-high-pressure water intake port 12f jets the jet. In addition, near the top,Pressure jetAn injection nozzle 12i and a compressed air injection nozzle 12j surrounding the injection nozzle 12i are formed.
[0034]
The aeration device 7 is supplied with the sludge water pumped up and sucked up by the well points 9, 9,..., And supplies air to perform aeration treatment to move volatile contaminants from the liquid phase to the gas phase.
[0035]
The contaminant treatment device 8 includes a contaminant decomposition treatment device 8a and a contaminant adsorption treatment device 8b. The contaminant decomposition apparatus 8a is an apparatus for decomposing contaminants by heat treatment, and is effective for removing harmful substances such as hexavalent chromium, mercury, and cadmium. The method of decomposing these contaminants is not limited to heating, but may be chemical treatment, electric treatment, ozone treatment, UV (ultraviolet) treatment, and if the contaminants are specified, Optimal processing can be selected from these methods. When a plurality of contaminants are used, these methods may be used in combination.
[0036]
The contaminant adsorption treatment device 8b is a device for adsorbing volatile organic chlorine compounds such as trichlorethylene and tetrachloroethylene contained in contaminated soil. Here, activated carbon is used as the adsorbent, but the method of adsorption is not limited to activated carbon, but may be zeolite or a chemical solution. In addition, if other contaminants are specified, an optimal adsorption process can be selected.
[0037]
As explained above, soilCleaning systemAccording to 1, in-situ, high-pressure water of 100 to 400 MPa is injected into contaminated soil to cut and crush the soil mass by its impact force and cutting force, and disperse the soil particles to remove contaminants. Can be separated.
[0038]
Next, the soil described aboveCleaning systemContaminated soil cleaning system usingAnd cleaning method using itWill be described. Of contaminated soilWashingThe cleaning method includes first to fifth steps. In the first step, the excavator drills holes in the contaminated soil to form the injection holes 2. As shown in FIG. 1A, on a vast site, if the grid spacing is, for example, 3 m, it is preferable to drill holes in the center of 1.5 m in length and 1.5 m in width.
[0039]
In the second step, a plurality of well points 9, 9,... Are cast around the injection hole. As shown in FIG. 1 (a), on a vast site, it is arranged in a grid pattern, and the interval may be 1m, preferably equal. Here, the well points 9, 9,... Are formed after the injection holes are formed, but the injection holes may be formed after the well points 9, 9,. Alternatively, it may be a parallel operation.
[0040]
In the third step, the rod 12 is inserted into the injection hole 2 formed in the contaminated soil, and compressed air is pumped to the nozzles 13 and 14 of the monitor 15 provided at the tip of the rod 12 to supply ultra-high pressure water. Is done. The ultra-high pressure water can be appropriately selected in the range of 100 MPa to 400 MPa depending on the form of the formation. A jet jet of ultra-high pressure water is jetted and swirled from the nozzles 13 and 14 to cut and pulverize the stratum to separate contaminants contained in soil particles of the stratum and to pour sludge water in a plurality of well points in a vertical direction. Let them in at 9,9 ... Also, by injecting compressed air around the ultra-high pressure water, frictional force with the surroundings is reduced, and a wide range of cleaning is possible. In this way, the method of moving the jet stream of ultra-high pressure water in the vertical direction while swirling cuts the stratum of contaminants contained in the relatively uniform stratum (for example, clay or silty) with small soil particles. And can be separated and recovered from the interlayer.
[0041]
In addition to cutting and pulverizing the soil mass by the cutting force of the cutting edge of the bit 12g, the jet pressure of the ultra-high pressure water from the nozzles 13 and 14 provided near the upper portion of the bit 12g can clean the clay and silt. Efficiently cut and crush even difficult soil. In addition, the impact energy generated by the ultra-high pressure water converts the impact energy to thermal energy,Sludge water temperatureRises. Theoretically, the temperature rises 24 ° C at 100MPa, 50 ° C at 200PMa, and 80 ° C at 350PMa, making it easy to efficiently separate and recover VOCs, oils, heavy metals, etc. adsorbed on soil particles. Is possible. Therefore, the use of ultra-high-pressure water significantly improves the efficiency of separating contaminants compared to the high-pressure water found in the conventional method.
[0042]
The air-jet mixed with the compressed air is injected to cover the jet jet, the frictional force with the surrounding water is reduced, and the range of the jet is increased several times. Also, by mixing a viscous substance such as a high-molecular polymer into the ultrahigh-pressure water, the convergence of the jet jet is improved and the cutting distance is extended, so that the processing capacity can be increased. Further, by mixing an additive such as a surfactant, the permeability is improved as the surface tension is reduced, so that the purification is promoted. Further, if a decomposition promoting substance is added, a chemical action is added, and more effective treatment is possible.
[0043]
Here, by providing various patterns for the rotational movement of the nozzles 13 and 14, it is possible to efficiently cut a stratum having uneven hardness and density. If the rotation speeds of the nozzles 13 and 14 are too slow, the jetting force is hindered by the backflow of the jet, so that a sufficient cleaning effect is not exhibited. Therefore, it is preferable to find the optimum moving speed in advance.
[0044]
Under the condition that the surroundings of the jet jet are filled with water in the ground, it is the same as underwater washing, and bubbles (cavitation) are generated at a place where the flow velocity is different due to negative pressure. This cavitation has an erosion effect at the time of collapse, and is therefore effective for crushing soil particles.
[0045]
In the fourth step, the sludge water sucked up at the well points 9, 9 ... is poured into the aeration device 7, supplied with air and aerated, and the contaminants are moved from the liquid phase to the gas phase to be volatilized. Organic chlorine compounds (VOC).
[0046]
In the fifth step, the sludge water is passed through the pollutant decomposition treatment device 8a of the contaminant treatment device 8 and actively heated by heat treatment to decompose the contaminants and remove heavy metals such as hexavalent chromium, mercury, and cadmium. Is removed. The heat treatment method isSludge waterHeating at a high temperature of 800 to 1000 ° C., steam heating, or BCD (alkali catalytic decomposition) may be used.
[0047]
In addition, the volatile contaminants are passed through the contaminant adsorption treatment device 8b to perform adsorption treatment to capture and collect volatile organic chlorine compounds such as trichloroethylene and tetrachloroethylene. Here, the adsorbent is activated carbon, but it is also possible to decompose or adsorb pollutants volatilized by the catalyst. By these processes, the generated gas is purified to a pollutant concentration equal to or lower than the regulation value, and thereafter, the gas is released to the atmosphere, and the water is collected in the water tank 10 and reused.
[0048]
(2nd Embodiment)
Hereinafter, a second embodiment of the present invention will be described. The injection hole 2 according to claim 2 can also be used as an investigation hole for investigation. Specifically, by collecting the contaminated soil and the sludge water before inserting the rod 12 into the injection hole 2, the water quality and the like contained in the contaminated soil can be investigated. In addition, since the injection hole is also used as the inspection hole for the inspection at the time of the preliminary inspection, the injection hole is unnecessary, and the cost and the construction period can be reduced.
[0049]
Contaminated soil cleaning system using ultra-high pressure water according to the present inventionAnd cleaning method using itHas a processing capability that is two to three times or more that of the conventional method. In addition, the contaminated soil of the present inventionWashingPurification systemAnd cleaning method using itThe present invention is not limited to only these embodiments, and can be appropriately changed as long as it is based on the technical idea of the present invention.
[0050]
【The invention's effect】
Claim 1According to the invention according to the first aspect, it is not necessary to install a shielding wall using a shielding plate found in the conventional method. In particular, in the case of contaminated soil having a huge volume developed over a large area, the effects of reducing costs and shortening the construction period are remarkable, and sludge water can be efficiently collected.
[0051]
According to the second aspect of the present invention, a processing ability two to three times or more that of the related art can be obtained.
[0052]
According to the method for cleaning contaminated soil according to the third aspect, the same operation and effect as those of the first or second aspect can be obtained.
[0053]
According to the method for cleaning contaminated soil described in claim 4, the treatment capacity can be further enhanced.
[0054]
[Brief description of the drawings]
FIG. 1 shows the present invention.Such soil washing systemFIG. 3A is a schematic cross-sectional view taken along line AA shown in FIG. (B) is a longitudinal sectional view taken along line BB shown in (a).
[Figure 2] SoilCleaning systemAnd (a) shows the soilCleaning systemIt is sectional drawing of the rod upper end part. (B) is the soilCleaning systemIt is sectional drawing of the rod lower end part.
Fig. 3 Soil obtained by the conventional high-performance soil washing methodCleaning systemIt is a processing flowchart which shows the processing process of (1).
FIG. 4 is a cross-sectional view showing a configuration of a conventional 12JSG method.
FIG. 5 is a cross-sectional view showing a configuration of a conventional column jet grouting method.
FIG. 6 is a cross-sectional view showing a configuration of a conventional high-pressure injection stirring replacement method.
[Explanation of symbols]
1 soilCleaning system
2 injection holes
2a Air packer
3Ultra high pressure water injection pump
4 Ultra high pressure hose
5 Air compressor
6 Drive
7 Aeration device
8a Pollutant decomposition equipment
8b Pollutant adsorption treatment equipment
9 well points
10 Water tank (tank)
11 Water supply device
12 rod
12a 1st tube
12b 2nd pipe
12c 3rd tube
12d, 12f Super high pressure water inlet
12e Compressed air intake
12g bit
12h, 12i super highPressure jetFiring nozzle
12j compressed air injection nozzle
13, 14 Double nozzle
15 monitors
16 stratum
19 Contaminated soil

Claims (4)

An injection hole (2) for injecting ultra-high pressure water into the drilled contaminated soil,
Well points (9), (9) for driving a pipe having a large number of holes in its outer periphery around the injection hole (2) to suck up the sludge water that has washed the contaminated soil;
An ultra-high pressure water injection rod (12) inserted into the injection hole (2);
Ultra high pressure water injection nozzles (12h) and (12i) for injecting the ultra high pressure water near the tip of the rod 12;
A contaminated soil cleaning system comprising: an ultra-high pressure water injection pump (3) capable of pressing ultra-high pressure water in a range of 100 MPa to 400 MPa into the rod (12);
The well points (9), (9) are arranged around the injection holes (2) in a number proportional to the area of the contaminated soil and are deeper than the contaminated soil. Soil washing system. A compressed air injection nozzle (12j) for injecting compressed air around the ultrahigh pressure water injected from the ultrahigh pressure water injection nozzle (12i);
A monitor (15) provided at the tip of the rod (12), including double nozzles (13) and (14) consisting of the ultra high pressure water injection nozzle (12i) and the compressed air injection nozzle (12j). The contaminated soil cleaning system according to claim 1, comprising: A method for cleaning contaminated soil using the contaminated soil cleaning system according to claim 1 or 2,
A first step of drilling the contaminated soil to form an injection hole (2);
A second step of casting a plurality of well points (9), (9) around the injection hole (2);
Ultra high-pressure water of 100 to 400 MPa is jetted onto the contaminated soil in which the injection hole (2) is formed to cut the contaminated soil, and the contaminants contained in the contaminated soil are used as sludge water as well points (9) and (9). The third step of pumping water from
A fourth step of supplying the sludge water to the aeration device (7) and volatilizing by aeration treatment
A fifth step of decomposing and / or adsorbing the volatile contaminants;
Is characterized by including the following steps. The method for cleaning contaminated soil according to claim 3, wherein a viscous substance containing a high molecular polymer and / or an additive containing a surfactant are mixed into the ultrahigh-pressure water.

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