TWI511807B - The use of multi-point injection of the original location of the purification method - Google Patents

Description

Original position purification method using multi-point injection

The invention relates to a raw position purification method for injecting a purification liquid containing a biodegradable organic substance into a ground plate to reduce the concentration of pollutants in the soil and groundwater.

As a technique for purifying the environmental pollution of soil and groundwater, there is a technique for bioremediation. The bioremediation system is a method of impregnating a solution of a nutrient solution for activating microorganisms (hereinafter referred to as "purification liquid") into a range of objects in the ground.

The original method of purifying the bioremediation method is to inject the purified liquid into the contaminated ground through the injection pipe, and purify the concentration of the pollutants in the soil and groundwater by the original position.

As a chemical liquid injection method to date, a double ring plug grouting method in which a ground consolidated material is pressurized and injected through an injection pipe densely arranged in the ground is used.

Therefore, in order to inject the purification liquid into the ground, the injection method used by Xianxin has of course been applicable. However, according to the study of the applicant, it is confirmed that if such a pressurized injection method is used, the purification liquid will be directed to the injection pair. It is easy to remove the original position, so that the purification of the original position is difficult. The applicant found that the reason was that the cleaning liquid did not have the same consolidation properties as cement slurry.

The double ring plug grouting method is to set a plurality of injection sleeves for each injection hole of 33 cm, and the structural injection is for the injection of each sleeve. The injection site is moved from the deep portion of the sleeve to the shallow portion. The injection of the chemical solution causes the cement slurry to gel, so the injection effect can be obtained by this method (refer to Fig. 9).

In the past, there is a method in which a purification material is added to an injection liquid (cement slurry) which is accompanied by gelation, and a purification material is contained in a gel to detoxify heavy metals (Patent Document 1). When a nutrient solution which is not accompanied by gelation is used, in the presence of a gelling agent, the purifying material is not easily directly interacted with the contaminant due to the presence of the gel, or the infusible liquid is first impregnated into the layer having high permeability. Curing is a problem in that the purifying liquid is difficult to penetrate the contaminated ground of the fine-grained soil, which is a problem.

In addition, when one side is withdrawn from the soaked section and then injected into each section, the injection time will be consumed, especially the soaking is easy to move toward the surface of the ground, so that the splitting injection (split infiltration) occurs, for each specific layer. Soaking between soil particles will be difficult to implement and is a problem for them. In addition, the site is mostly composed of layers of different soils such as sand or silt, clay, etc., and the layers of the fine-grained soil layer in which the pollutants are accumulated may have a problem that the injection liquid is not easily penetrated.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-228685

[Patent Document 2] Japanese Patent No. 4848553

[Patent Document 3] Japanese Patent No. 3555952

[Patent Document 4] Japanese Patent No. 3724644

[Patent Document 5] Japanese Patent No. 5092103

[Patent Document 6] Japanese Patent No. 3762353

In bioremediation, the purifying liquid is a non-curable aqueous solution in which a microbial nutrient is dissolved in water, and its viscosity or behavior in the ground is almost the same as water. In addition, since such a purifying liquid has no consolidating property, if it is injected into the ground, it will flow toward a portion having a high water permeability, and the local disc is interbedded, so that it is difficult to saturate the silt and the clay. Moreover, the cleaning liquid itself has no influence on the water permeability of the soil, and it moves together with the groundwater by the injection pressure.

On the other hand, the cement slurry accompanying gelation is consolidated after a certain period of time from the injection. In the soil with high water permeability, the cement slurry is easily impregnated, so that the water permeability of the cement slurry becomes lower relative to the surrounding water after injection. Therefore, the cemented cement slurry has a great influence on the water permeability of the soil, and is different from the non-curable purification material. Therefore, in the site consolidation method, if the soil layer having a large water permeability such as a sandy land is consolidated and stopped, the object can be achieved accordingly.

However, if it is accompanied by a gelatinized cement slurry and a cleaning liquid, it will have an effect on the water permeability, and it will be easy for the pollutants. The problem of insufficient impregnation of the accumulated fine-grained soil layer.

Further, since the gel in the contaminated area is impervious to water, the purifying material in the gelled purifying liquid has a problem that it is difficult to effectively act on the contaminant.

On the other hand, if the non-hardening cleaning liquid is injected, it will not gel, so it will be soaked everywhere, and it will easily escape along the boundary of the coarse layer or layer. At the same time, it will also eject pollutants or the cleaning liquid will not penetrate into the pollutants. It is easy to accumulate the fine grain land plate, so the original position is difficult to purify.

For example, in the double-ring plug grouting method shown in Fig. 9, one injection tube performs injection at a depth (usually 33 cm), and is injected at any injection portion (spit) (usually discharge per minute) After 10 liters to 15 liters), when the injection zone (discharge port) moved to the next position is injected, since the pressure of the injection will push out the pre-injected purification liquid, the purification liquid will be transferred to the coarse soil layer, accompanied by Therefore, the pollutants are pushed out and easily diffused, and the cleaning liquid is not easily applied to the pollutants in the fine-grained soil, which is a problem.

In addition, when the gelation of the vermiculite cement slurry and the purification material accompanied by gelation is carried out (Patent Documents 1 and 3), the purification material in the gelled purification liquid does not effectively act on the pollutant or is caused by condensation. The presence of glue, the activation of microorganisms in the soil is hampered, is the problem. In addition, in the case of injecting a purification material which is not accompanied by gelation, the purification material will escape to the soil layer which is easy to be infiltrated, and the penetration of the purification liquid is insufficient for the site where the contaminant is distributed. Therefore, the active environment of microorganisms is not fully integrated, and there is a problem that the concentration of pollutants is reduced and stagnant.

Moreover, the natural injection is a method of infiltrating the purification liquid into the ground by gravity through a perforated pipe or a well provided with a groove at a depth of the aquifer. However, according to the natural injection method, the soil with good water permeability is good. Although the purifying liquid will be saturated, there is a problem that the silt and the clay will not penetrate.

As a matter of course, the problem of the prior art is that a portion where the purifying liquid is insufficiently impregnated is generated, so that the original position purification is not easy to achieve.

Therefore, when bioremediation is implemented, it is required to solve the following problems.

(1) In order to prevent the non-consolidating cleaning liquid from escaping to the ground surface and staying at a specific position where the contaminant is present, the original position is purified, and it is necessary to penetrate the soil particles at a low pressure (refer to Fig. 1).

(2) The pollutants are adsorbed on the small silt and clay of the particles, and exist in a high concentration in the silt and clay layer. Therefore, the purified liquid must also be able to penetrate into the layer with poor water permeability.

(3) The site is mostly sandy or so-called silt, clay, and other layers of soil are layered into layers. Therefore, it is necessary to separately infiltrate different soil layers.

(4) The distribution of pollution is dim in the plane and depth direction. Therefore, at the time of proper purification, it is required to soak the purification liquid corresponding to the distribution and concentration of the pollution.

(5) It is important to surely soak the purified liquid in the contaminated area.

(6) As described above, in the injection method of Fig. 8, the injection method described in Patent Documents 1, 2, 3, and 4 is accompanied by gelation, so that the purification reaction is insufficient. In the case of the above-mentioned non-reactive purification material, the purification liquid is not saturated and maintained in a specific area, and therefore the pollutants are also pushed out of the original position by the injection pressure. Therefore, it is necessary to inject the purification material into the original position at an injection speed within the limit pressure between the impregnated soil particles, and to purify the pollutants without moving the existing pollutants. Therefore, the injection speed is 1 to 6 liters/min (refer to Fig. 1 and Fig. 2).

(7) In order to make the purification liquid injected into the contaminated site impregnated between the soil particles, it is necessary to inject at a very low pressure. However, in this case, the construction time will become too long, and it is necessary to self-compute based on the starting point that the construction efficiency must be improved. The injection tubes are simultaneously injected (see Figure 2 for reference).

In order to allow the non-consolidating cleaning liquid to permeate into the fine-grained soil, it is known that it is intended to be injected into the soil infiltration limit between the particles in Fig. 1 under the condition of the ground object of Fig. 2(b) to be injected. The spit outlet should have an injection speed of 1 to 6 liters/min. In order to carry out the injection construction at an economical speed, it can be seen from Fig. 2(a) that a plurality of discharge ports are provided, or a injection pipe is used for the injection pipe, and the discharge port is placed at different positions. The problem of this economic speed can be solved by forming a plurality of thin tube bundles into a bundled thin tube or by implanting the injection tubes in a plurality of injection holes simultaneously.

The present invention has been made in an effort to solve the above-described problems of the prior art.

The invention relates to an original position purification method using multi-point injection, which is characterized in that: through a plurality of injection pipes provided in a ground plate, a nutrient solution is injected into a plurality of injection sites of the contaminated site (non-curing purification) Liquid), the original position purification method using a multi-point injection to purify the contaminated site; the use of: a non-curable purification liquid for injecting biodegradable organic matter into a site of a plurality of injection sites a plurality of injection pipes having a discharge port at the front end, one or a plurality of injection pumps for injecting the purification liquid into the ground through the injection pipe, and a flow rate and pressure for measuring the flow rate and pressure of the purification liquid supplied to each injection pipe The multi-point injection device of the device separates the soil layers of the object to be cleaned, and determines the position of each soil layer at the discharge port of each injection pipe, and the volume, water permeability coefficient and clearance of the area responsible for the discharge. Rate, setting the injection amount and injection speed of the above-mentioned purification liquid, and in response to the injection condition of the purification liquid in each injection tube and for each injection site The delivery state of the chemical liquid controls the flow rate and pressure of the injection pump to synchronize the injection of a specific amount to each other at the same time, so that the penetration of the purification liquid from the discharge ports of the injection pipes is mutually limited. Responsible for each of the adjacent In the range of the image, the occurrence of insufficient penetration of the purification liquid is prevented, and the purification liquid is prevented from escaping outside the contaminated object area and the contaminant accompanying it escapes from the original position, and the pollutant is purified by the action of the above purification liquid. .

In the present invention, in the soil or waste containing the pest, the purification liquid is simultaneously impregnated between the soil particles from the plurality of injection ports, thereby limiting the purification liquid to a specific area, and purifying the harmful substances or wastes. This can prevent the spread of the contaminated area, and the injection of the soil purifying liquid by the above method can be limited to a specific area to allow the purifying liquid to permeate and purify the contaminant in the original position, and the effect is excellent.

The term "hazardous substance" as used in the present invention refers to a heavy metal containing hexavalent chromium, mercury, lead, cadmium, etc., waste soil generated by earthwork, incineration ash, sludge, industrial waste, environmental hormones, and pesticide residues. Organic solvents such as organic solvents, organic detergents, and earthworms such as dioxin, which have adverse effects on the human body or the environment, examples of harmful substances include alkyl mercury, total mercury, cadmium, and lead. Organophosphorus, hexavalent chromium, arsenic, cyanide, polychlorinated biphenyl (PCB), trichloroethylene, tetrachloroethylene, dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-two Vinyl chloride, cis-1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 1,3-dichloropropene, thiuram, simazine , grass, benzene, selenium, etc.

An example of decomposition of microorganisms used in bioremediation is as follows.

The organic matter in the industrial waste can be decomposed by microorganisms such as bacteria or filamentous bacteria. The ammonia system related to the formation of trihalomethanes of carcinogens may be nitrifying bacteria, and the industrial solvent trichloroethylene may be classified by ammonia oxidizing bacteria. solution. Further, the pesticide system can be decomposed by filamentous bacteria, bacteria, and radiobacteria in the soil.

These microorganisms can be activated by the above-mentioned purification liquid to decompose the above-mentioned pollutants.

For example, the Balazon system can be jointly decomposed by Pseudomonas stutzeri and Pseudomonas aeruginosa. Further, the carbamate-based insecticide can be decomposed by penicillin or Trichoderma. In addition, polychlorinated biphenyls (PCBs) can be decomposed by Pseudomonas and Alcaligenes, and chlorobenzene can also be decomposed by Pseudomonas.

The soil microorganisms activated by the purification liquid include microorganisms or fungi that are living on the leaves of the plants, and bacteria. Typical are yeast, filamentous bacteria, and bacteria.

As a species of microorganism that lives on the surface of a leaf, there are known, for example, Pseudozyma (P. antarctica, P. ruglosa, P. parantarctica, P. aphidis, etc.) or Cryptococcus (Crystalum lunata, Huang Yin). Cocci, etc.), in addition to red yeast, sticky red round yeast, Sakaguchia dacryoidea, lock spore yeast or corn black powder fungus.

For example, Pseudozyma antarctica JCM3941, Pseudozyma antarctica JCM10317, Pseudozyma antarctica JCM3941, Pseudozyma ruglosa JCM10323, and Pseudozyma parantarctica JCM11752, and the like can be cited.

Examples of the filamentous fungus include, for example, Acremonium, Intertwined fungus, Rhizoctonia, Rhizoctonia, Aureobasidium, Cladosporium, Artemisinus, and outer bottle. Fungi, cyanobacteria, leaves Filaria-like fungi of the genus Fusarium, Paecilomyces, Penicillium, Clematis, Trichoderma, Pseudotaeniolina, Schistosoma, Phaeosphaeriopsis, and Saccharomyces.

If so, a nutrient source is injected into the contaminated site in situ to activate and proliferate the microorganisms in the soil to decompose the pollutants.

The construction method for the use of the site consolidation material is known from the patent documents 1, 2, 3, 4, 5, and 6. As a device for multi-point injection of the purification liquid of the present invention, for example, the same mechanism as that of the devices disclosed in Patent Documents 1, 2, and 4 can be employed. However, the present invention is a purification liquid for bioremediation which is a nutrient source of microorganisms. Since it is non-hardening, as described above, it differs from the behavior of the curable injection liquid at the time of injection. Therefore, even if the above-described injection device is used and the method of the present invention is not used, it is difficult to inject a specific injection region. The original location of the pollutants is purified.

As a method of the present invention, first, as shown in Fig. 1, it is necessary to inject the injection rate within the injection pressure limit between the soil particles which can be impregnated with the cleaning liquid, that is, the injection pressure and the injection speed are in a straight line range. This injection speed is 1~6 liters per minute.

On the other hand, in this case, since the injection speed is very small and economic benefits cannot be obtained, it is necessary to increase the injection speed integrally by simultaneously injecting from the majority of the spouts, and it is necessary to spit out from each other. Injection can be done in a manner that is limited to each other. Therefore, it can be seen from Darcy's law of Fig. 2 that the injection speed can be increased at a low pressure by increasing the impregnation area A. That is, it is possible to increase the injection speed by injecting the thin tube using the bundle of Figs. 3 to 4.

For the same reason, if the thin tube can be injected into the column-shaped impregnated bundle according to Fig. 5 and Fig. 6, the discharge speed of each of the injection tubes can be increased, and the low injection rate can be used at a large injection speed. It is possible to infiltrate the particles between the soils in Fig. 1. This point has been discovered by the applicant.

Fig. 5 is a specific example of the present invention. Figure 5 is a plurality of injection tubes provided with a cleaning liquid for injecting a biodegradable organic substance into a plurality of injection sites, and a plurality of monomers for injecting a cleaning liquid into the ground through the injection tubes. a pump (injection pump), a flow rate and pressure measuring device for measuring the flow rate and pressure of the cleaning liquid delivered to each injection tube, a monitoring disk for displaying each injection site, and a control unit, a flow rate and a pressure for controlling the above-mentioned single injection pump The multi-point injection device of the measuring device and the centralized management device of the monitoring disk activates the single pump, and comprehensively monitors the injection state of the injection pipe, the cleaning liquid at each injection site, and the purification liquid for each injection site in the monitoring disk. In the liquid feeding condition, the unit pump and the flow and pressure measuring device are controlled by the centralized management device, and simultaneously or selectively injected at a plurality of injection sites, so that the flow of the cleaning liquid from each injection pipe is injected into each tube. The specific areas in charge are limited to each other, and prevent the occurrence of insufficient penetration of the purification liquid, and purify the pollutants by the action of the above-mentioned purification liquid

Fig. 7 and Fig. 8 show a method of purifying the injecting purification liquid and preventing the escape of the contaminant in the present invention.

The liquid supply pump and the driving device are respectively configured as one unit, and the unit is provided with a plurality of units, and the units are independently operated, and the units are collectively controlled as a whole, and the cleaning liquid is controlled by the control. The inverter of each liquid feeding pump can easily set the discharge speed of each liquid feeding pump, and control the amount of discharge corresponding to the amount of soil corresponding to one injection zone and the necessary discharge time required, even if the injection hole spacing or soil quality Differently, the injection amount is set in such a manner that the boundary surfaces of the responsible regions of the respective injection pipes which are horizontally or vertically connected to each other are alternately adjacent to each other, so that the injection of each of the segments is completed at the same time. When the injection is performed in synchronization, the flow of the purification liquid is limited to each other, and can be effectively purified in the original position without being contaminated. As the injection tube device at this time, an injection tube as shown in Figs. 3 to 6 to be described later can be used.

Specifically, in accordance with the volume, water permeability coefficient, and gap ratio of the responsible area of each injection tube, the injection amount or injection speed or injection pressure of the purification liquid is obtained, and the purification liquid from each injection tube is saturated for each region. The flow of the cleaning liquid can be limited to each other for the specific area in which each injection tube is responsible.

Further, Fig. 13 shows an injection device which can be simultaneously injected or continuously injected from an injection pump for a plurality of injection tubes to be injected through the injection lines of the branch valves.

When the present invention is used as a bioremediation application, the decontaminating solution may be a nutrient solution which is based on carbohydrates or proteins and which is capable of activating microorganisms in situ.

In addition, the bioremediation system utilizes the activation of microorganisms for the purification of pollutants, and the purification liquid system uses a purification liquid containing a nutrient for activating the microorganisms in the original position, and if it is self-contained on a plurality of injection pipes of the contaminated site, Simultaneous or selective injection for more effective use of pollutants The purification of quality.

According to the present invention, in the original position purification method of bioremediation, etc., the injection and the immersion of the cleaning liquid by the multi-point injection are utilized, so that the injection of the specific amount is limited to each other within the scope of each responsible object and in accordance with the situation of the site. The method is synchronized in such a manner that the cleaning liquid is soaked in the same time range, so that the purifying liquid is soaked in the same range of the object, the occurrence of insufficient penetration of the portion can be prevented, and the contaminant substance can be prevented from being pushed out of the target range to escape.

Further, since the portion where the purifying liquid is insufficiently penetrated does not occur and does not escape, the contaminant can remain in the target range, and the purifying material can act on it, thereby reducing contamination and purifying.

1‧‧‧Drilling

2‧‧‧Injection tube

2A‧‧‧ bunching into the thin tube

2a‧‧‧Injected tubules

3‧‧‧ gap

4‧‧‧ Sealing cement slurry

5‧‧‧Exporting

5a‧‧‧ check valve

6‧‧‧Column space water guiding parts

7‧‧‧ Column-shaped infiltration source

10‧‧‧ Purified liquid storage tank

11‧‧‧ catheter

12‧‧‧Single pump

13‧‧‧Flow and pressure detecting device

14‧‧‧ check valve

15‧‧ rev.

16‧‧‧Drive source

17‧‧‧Centralized management device

18‧‧‧Injected inner tube lifting device

19‧‧‧Injection site management device

21‧‧‧ Sealing cement slurry injection pipe

21a‧‧‧Exporting

22‧‧‧Injected into a thin tube fixing plate

23‧‧‧ bag package (bag body)

24‧‧‧cement slurry injection pipe

24a‧‧‧Exporting

30‧‧‧ separator

31‧‧‧Injected into the thin tube fitting hole

32‧‧‧ Sealing cement slurry injection pipe

Fig. 1 is a graph showing the relationship between the pressure of the non-curable cleaning liquid, the injection speed, and the setting of the limit injection speed.

Fig. 2(a) is a schematic view showing the characteristics of columnar permeation of the non-consolidation purification liquid of Darcy's law, and (b) is a table showing the relationship between the particles of the site to be injected and the water permeability. Into the map.

Fig. 3 is a conceptual diagram showing the relationship between the area of the injection tube and the injection amount of the cleaning liquid, the injection speed, and the like in the original position purification method of the present invention. The I, II, III, IV, and V systems represent soil layers.

Fig. 4 (a) to (b) are the notes used in the original position purification method of the present invention. An illustration of an example of the inlet pipe; (a) shows the injection capillary, and (b) shows the bundle injection capillary.

Fig. 5 is a schematic view of a multi-point injection device constructed by simultaneously injecting a cleaning liquid into a thin tube at a plurality of injection sites in a plurality of injection sites.

Fig. 6 (a) to (c) are views showing an embodiment of a columnar-filled injection tube device used in a multi-point injection device, and (a) is a front view showing a plurality of injection tube bundle sets. (b) and (c) are enlarged sections of the main part.

Fig. 7 (a) to (c) are conceptual diagrams showing the simultaneous injection of the cleaning liquid from the column-shaped permeation source of each injection tube having the responsible area in the in-situ purification method of the present invention, and (a) shows the vertical direction. (i) is a diagram showing the synchronization of the vertical direction at one point in the horizontal direction, and (c) is a diagram showing the limitation of the penetration of the purification liquid between the regions in charge.

Figure 8 (a) ~ (b) is a plan view showing the relationship between the area and the penetration of the purified liquid. By injecting the synchronization of Fig. 7 (a), (b), and Fig. 8 (a), the site of Fig. 3 can be limited to each other as shown in Fig. 7 (c) and Fig. 8 (b). The original location of the pollutants is purified.

Fig. 9 is a view conceptually showing a state in which a contaminant diffuses and moves in a conventional method of injecting a bioremediation cleaning liquid by a double ring plug grouting method.

Fig. 10 (a) to (d) are views showing an example of the structure of an injection tube which does not allow the purification liquid to escape to the ground surface.

Figure 11 (a) ~ (b) shows a separator installed with a thin tube For example, (a) is an elevational view, and (b) is a plan view.

Fig. 12 (a) to (c) are views showing an example of a bundled injection capillary tube provided with a columnar water guide member, (a) an elevational view, (b) a horizontal sectional view, and (c) an enlarged view. .

Fig. 13 is a schematic view showing an example of an injection system of the present invention.

Fig. 1 to Fig. 3 are conceptual diagrams showing the relationship between the responsible area of each injection tube in which the multi-point injection is applied, the injection amount of the purification liquid, the injection speed, and the like in the original position purification method of the present invention.

In Fig. 3, the site to be cleaned is divided into 5 layers of I~V. The permeation coefficient of each layer is K _i , the gap ratio is α _i , the volume is V _i , the injection amount of the purification liquid is L _i , and the discharge amount per minute is represented by l _i .

In the present invention, the injection and the soaking of the cleaning liquid by the multi-point injection are basically synchronized in accordance with the situation of the ground plate in such a manner that they are mutually limited within the scope of each responsible object, for example, the responsible volume V _{i of the} responsible area The water permeability coefficient K _i and the gap ratio α _{i are} obtained, and the injection amount L _{i of} the purification liquid is obtained, and even the discharge amount l _i per minute is injected, whereby the purification liquid is satisfactorily impregnated for each object range, thereby preventing the penetration. Insufficient parts occur.

Fig. 4(a) and Fig. 4(b) are diagrams showing an example of an injection pipe inserted into a ground plate when the home position purification method of the present invention is implemented, and the injection pipe system shown in (b) is a plurality of injection pipes 2a for each injection pipe. 2a front spit 5 is moved in the direction of the tube axis by a certain length, and the bundle is integrated into a bundle.

According to this configuration, it is possible to simultaneously inject the cleaning liquid into a plurality of sections (stratigraphic layers) having different depths of the discharge port 5 at the front end of each of the injection capillary tubes 2a, or to arbitrarily select a plurality of sections to simultaneously inject.

An example of a method for purifying a VOC (volatile organic compound) according to the present invention is as follows.

The pollutants to be purified are made of tetrachloroethylene and trichloroethylene, and are purified by a multi-point injection method.

The purified liquid is an organic substance mainly composed of carbohydrates and proteins, and is biodegradable, and is metabolized by microorganisms as a nutrient source of microorganisms. Preferably, sugars which can be metabolized by microorganisms in the soil can be used.

Specifically, for example, monosaccharides such as glucose or fructose, disaccharides such as sucrose, maltose or galactose, other polysaccharides such as oligosaccharides, starch or maltodextrin, or other saccharides may be exemplified.

The principle of purification is as follows.

(1) The aerobic microorganisms originally in the ground are activated by the purifying liquid soaked in the ground.

(2) Aerobic microorganisms consume oxygen in the ground to form an anaerobic atmosphere (state of low oxygen).

(3) The anaerobic microorganisms are activated by the purification liquid. By the anaerobic microorganism, the organic matter in the purification liquid is decomposed to generate hydrogen (H).

(4) Anaerobic microorganisms replace chlorine (Cl) of VOC with hydrogen (H) break down.

(5) Once the VOC disappears, the anaerobic microorganisms are reduced after the purification liquid is consumed, and return to the original environment.

In order to perform the home position purification in a heterogeneous contaminated site using the above purification principle, the present invention employs the following method.

Fig. 5 and Fig. 6 show the multiple points formed by a plurality of injection sites A, B, C, and D in which a non-hardening cleaning liquid containing biodegradable organic matter can be simultaneously injected at a plurality of injection sites. Injection device and purification method.

If a multi-point injection device for injecting a thin tube into a column is used, the above-described simultaneous injection becomes easy. In the figure, 5 is a spout, and a check valve 5a such as a rubber sleeve that covers the discharge port 5 is a film having a slit or a blanket or a mesh or a belt. A cylindrical water guiding member is constructed. The purge liquid is discharged from the discharge port 5 through the check valve 5a and the columnar space water guide member 6 from the columnar permeation source 7 as a whole. Therefore, it can be injected at a low pressure from a large source of permeation (Fig. 2).

In the figure, in each of the drill holes 1 formed at a plurality of injection locations, the injection pipes 2 of the injection pipe device shown in Fig. 6 are densely arranged, and the front ends of the injection pipes 2 are closed and the side portions of the front end are closed. The purge liquid discharge port 5 is formed in one portion or a plurality of portions, and a check valve 5a and a columnar space water guide member 6 are attached thereto.

Further, the front end of each of the injection pipes 2 configured as described above is disposed at a position spaced apart by a predetermined interval in the depth direction of the borehole 1. also, The gap 3 between the hole wall of the borehole 1 and each of the injection pipes 2 is filled with a sealant slurry 4 which is longer than a specific section. According to this configuration, in the gap 3 between the drill hole 1 and the injection pipe 2, a plurality of continuous column-shaped permeation sources 7 in a certain interval L in the tube axis direction are formed at a predetermined interval in the tube axis direction.

By using such a column-shaped soaking injection method, the injection source of one lot can be taken longer, so even if the injection speed of each lot is increased, the injection can be performed at a low pressure, thereby preventing the movement of the contaminant, and Since the diameter of the bundled injection tube is small, the effect of reducing the borehole diameter can be exerted.

Further, as shown in Fig. 5, a plurality of unit pumps 12 for injecting the cleaning liquid into the ground via the injection pipe 2 are provided for measuring the flow rate and pressure of the cleaning liquid supplied to each injection pipe. The flow rate and pressure measuring device 13 is a monitoring disk for liquid crystal display at each injection site, and is used for controlling the multi-injection device of the unit pump 12, the flow rate and pressure measuring device 13 and the centralized management device 17 of the monitoring disk. The unit pump 12 is operated to collectively monitor the injection condition of the injection tube in the monitoring tray, the injection liquid of each injection point, and the liquid supply status of the purification liquid at each injection point, and the unit pump 12 and the flow rate and pressure measuring device 13 are collectively monitored. Controlled by the centralized management device 17, and simultaneously or selectively implanting a plurality of injection sites, thereby restricting the flow of the purification liquid, preventing the occurrence of insufficient penetration of the purification liquid, and discharging the pollutants in a specific area. Purification.

Specifically, each of the injection pipes 2 is connected to a purification liquid storage tank 10 for storing a purification liquid via a conduit 11; and each of the conduits 11 is connected to a single pump that presses the injection material from the injection material storage tank 10 to each injection pipe 2; 12. A flow rate and pressure detecting device 13 for detecting the flow rate and pressure of the purified liquid at each injection site, and a valve 14 for starting and interrupting the pressure feed of the purified liquid.

Each of the unit pumps 12 is provided with a revolution number transmission 15 such as an inverter, and is driven by an independent drive source 16 such as a motor. Further, each of the unit pump 12, the number of revolutions 15, the flow rate and pressure detector 13, and the valve 14 are connected to the centralized management device 17, and are individually controlled by the centralized management device 17.

In this configuration, the signal from the flow rate and/or pressure data of the flow rate and pressure detecting device 13 is sent to the centralized management device 17, and the respective injection tubes 2 are actuated by the respective unit pumps 12 from the storage tanks 10, respectively. The cleaning liquid is pumped at an arbitrary injection speed, injection pressure, and injection amount.

Then, at a plurality of injection sites, the purification liquid is simultaneously or selectively simultaneously discharged from the purification liquid discharge port 5 of each injection pipe 2 to the columnar permeation source 7, and is simultaneously impregnated and injected into the surroundings from the columnar permeation source 7. In the construction site, the cleaning liquid can be simultaneously injected into the plurality of injection sites A, B, C, and D at a plurality of injection locations.

In the in-situ purification method of the present invention, the concept of improvement of the improvement rate and the improved shape for the impregnation of the purification liquid other than the responsible area by synchronizing the injection of the purification liquid is as shown in Figs. 7 and 8 Shown. Synchronization means that the injection of the responsible volume adjacent to the injection tube ends at the same time, and the boundary surface or the injection range of each other is limited to allow the purification liquid to permeate.

Simultaneous purification by multiple injection tubes The injection of liquid, and purification by injecting the purification liquid into a specific range at the highest discharge speed of each soil layer without causing the movement of soil particles or cracking, can not be injected at other depths The purifying liquid is ejected, or the contaminant is not diffused to the outside, and the purifying liquid is discharged from the injecting tube in the same manner.

When performing the multi-point injection method, it is desirable to be able to maintain the injection period of the adjacent depths without a time difference. The difference in time is that the injection of one party ends first, while the other neighboring party continues to inject. At this time, the purification liquid on the end side is pushed out by the injection pressure together with the pollutants from the other side.

In order to allow the cleaning liquid to permeate within the target range and prevent the occurrence of insufficient penetration, it is desirable that the injection time of each depth in the multi-point injection method is uniform.

In the apparatus of the fifth aspect, the injection tube device comprises, as shown in Fig. 6, an injection tube 2 having a plurality of purification liquid discharge ports 5 and a check valve covering the discharge port 5 in the tube axis direction. 5a is disposed in the borehole; the column-shaped permeation source 7 is installed in a manner that covers a certain range of the tube axis direction including the portion having the purified liquid discharge port 5 and the check valve 5a in the outer peripheral portion of the injection pipe 2 The columnar space water guiding member 6 is configured; and the sealing cement slurry 4 is filled in the gap between the hole wall of the borehole 1 and the injection pipe 2 and the columnar space water guiding member 6. The columnar space water guiding member 6 has a lower side portion in the tube axis direction and a side portion opposite to the drilling hole wall covered by the sealing cement slurry 4, thereby forming a separate column-shaped infiltration source 7; the sealing cement slurry 4 has Available through injection tube 2, discharge port 5, and check valve 5a The discharge pressure of the purification liquid injected into the ground plate is broken and the strength is broken; by injecting the sealed cement slurry 4 from the column-shaped permeation source 7 and injecting it into a specific injection section, the purified liquid can be discharged even with a large discharge amount. The low pressure is injected into the ground, and the cleaning liquid from other injection sections or other injection pipes can be injected into the ground for independent injection sections without backflow in the injection pipe.

The present invention is directed to a plurality of cleaning liquids which are simultaneously discharged from a plurality of discharge ports 5, and the fluid layers thereof are mutually repelled by the impregnation pressure of each other, and are not easily mixed. Therefore, the injection liquid is permeated horizontally in the layer to the ground. in.

The cleaning liquid will produce a phenomenon that does not substantially escape to the surface of the ground and saturate in the horizontal direction, so that the contaminated site can be purified in one vertical direction or in the horizontal direction.

Therefore, in the present invention, the purification liquid system can be injected at a highest discharge speed for each soil layer and can be impregnated from the pores of the soil pores from a discharge port, and the impregnation pressure systems of the adjacent purification liquids are mutually repelled and layered. Soaking, so that the low pressure does not cause the pores to clog, and the large amount of spit can still continue to soak for a long time.

As a result, the present inventors have found that if a plurality of sections are simultaneously impregnated, the flow lines in the upper layer and the lower layer of the purification liquid are mutually limited by the wetting pressure of each other, so that the permeation in the up and down direction is hindered in the horizontal direction. Soaked. The injection liquid is selected according to the condition of the soil layer in each section, and the injection rate is selected and injected.

The thin tubes are separated from each other in the axial direction by the discharge ports. The position mode is a plurality of bundles, whereby the most appropriate injection can be simultaneously achieved for each of the layers even if the ground conditions are different for each site. In addition, stereoscopic simultaneous injection into the vertical and horizontal directions in the ground can also be performed.

Fig. 10 and Fig. 11 show an example of an injection tube device used in the present invention.

Heretofore, when the consolidated cement slurry is injected into the thin tube 2A from the bundle of the injection thin tube 2a, if the bundle injection tube 2A is placed in the sealed cement slurry 4 in the borehole, even if the bundle is injected into the thin tube 2A The injection thin tubes 2a have a space with each other, and the consolidated cement slurry reacts with the seal grout 4 in the borehole, and the space is consolidated to close the bundles without problems.

However, the cleaning liquid is uncured as described above, and in the case of using the bundle injecting the thin tube 2A, even if the bundle injecting thin tube 2A is placed in the sealing grout 4, the thin tubes 2a are injected into each other. Since the gap is not sufficiently filled and there is a space left, the cleaning liquid flows out from the gap of the injection capillary 2a to the ground and is not easily injected into a specific region. Therefore, the following methods are used.

(1) In the hole not only in the borehole, the bundle is injected into the narrow tube 2a, and the gap between the injection tubes 2a is filled with the sealant slurry 4. For this purpose, the sealant slurry injection pipe 21 is placed in the bundled injection pipe 2A to seal the gap (the injection pipe 21 for sealing cement slurry in Fig. 10). It is also possible that the sealant slurry is pumped by the injection pipe 21 while the sealant slurry is being injected.

(2) A method in which the separator 30 is placed on the bundle injecting capillary tube 2A and placed in the sealing cement slurry 4 in the drilling site (refer to Fig. 11).

(3) The method of injecting the bundle into the thin tube 2A in the sealed cement slurry 4, at least in the position of the contaminated area, the upper bundle is injected into the gap of the thin tube 2A or the contaminated area is the upper portion, and the cement slurry is injected (Fig. 10 (Fig. 10 ( d) Reference).

(4) A bag body 23 is provided at an upper portion of the bundled injection pipe 2A at least in a relatively contaminated area, and a solid material is injected into the bag body 23 to inject the bundle into the gap of the thin tube 2A to block it (Fig. 10) (a), (b), (c) reference).

(5) In the above (4), a plurality of bags 23 are provided, and a method of injecting a cement slurry from an injection port provided between the bag bodies 23 (refer to Fig. 10 (a) and (b)).

(6) A method in which the bundle injection tube 2A is covered with the bag body 9 and the injection port is opened outside the bag body 9 (refer to Fig. 12).

Figure 13 shows the injection system of the present invention.

Fig. 13 is a view showing a system in which a cleaning liquid is simultaneously or continuously injected from a single injection pump through a branch valve into a plurality of injection thin tubes (beam collection injection tubes). The injection pressure, the injection speed, the management of the injection amount, and the actuation of the valve and the injection pump are performed by the controller. The injection tube 2 may be an injection thin tube or a bundle of four injection thin tubes.

[Examples]

For the injection of the purification liquid, the double-ring plug grouting method of the prior art (A) and the multi-point injection method of the means of the present invention are respectively carried out, and the impregnation of the purified liquid is evaluated accordingly. For the soil having a radius of 1 m from the injection site, the amount of the purified organic liquid having a total organic carbon concentration of 100 mg/L or more is designed and injected.

The distribution of the purification liquid at a specified distance from the injection site of each method is shown in Table 1 as the total organic carbon concentration.

After injecting the cleaning liquid by the specified method, drilling is performed at the set position, and the sample for analysis is taken by the core.

According to Table 1, the conventional technique (double loop plug grouting method) observed a variation width of 485 to 45 mg/L from the total organic carbon at various depths at a position of 0.5 m from the injection well. From the position of 1.0m from the injection tube, the variation width is 93~20mg/L, and the overall variation width is 485~20mg/L.

On the other hand, according to the method of the present invention (Fig. 3 In the multi-point injection method of the configuration shown in Fig. 5, the variation width of 291 to 234 mg/L was observed for the total organic carbon at various depths from the injection well 0.5 m. From the position of 1.0m from the injection well, the variation width is 228~108mg/L, and the overall variation width is 291~108mg/L.

Compared with the prior art, according to the method of the present invention, the relative organic carbon concentration of 100 mg/L is relatively designed, and the variation of the fluctuation is suppressed. That is, it can be understood that the insufficient penetration of the purification liquid did not occur.

Claims (7)

An original position purification method using multi-point injection, characterized in that: through a plurality of injection pipes provided in a ground plate, a non-curable purification liquid is injected into a plurality of injection sites of the contaminated site, and the contaminated site is purified. The original position purification method using multi-point injection; the multi-point injection device is used to: inject a non-curable purification liquid containing biodegradable organic matter into a contaminated site of a plurality of injection sites. a plurality of injection pipes having a discharge port at the front end, one or a plurality of injection pumps injected into the contaminated site through the injection pipe, and flow and pressure for measuring the flow rate and pressure of the purification liquid delivered to each injection pipe The measuring device uses the multi-point injection device to distinguish the contaminated sites that are the targets to be cleaned, from the responsible regions of any size, and the discharge ports of the respective injection pipes determine the positions of the respective responsible regions, and the spouts are discharged. The volume, water permeability coefficient and gap ratio of the area in charge, and the injection amount and injection speed of the above-mentioned purification liquid are set, and The injection condition of the cleaning liquid in each injection pipe and the delivery state of the purification liquid for each injection site control the flow rate and pressure of the injection pump to synchronize the injection of a specific amount to each other at the same time, so as to be synchronized. The impregnation of the purification liquid from the discharge ports of the injection pipes is mutually confined to each of the adjacent responsible areas, thereby preventing the occurrence of insufficient penetration of the purification liquid, and preventing the purification liquid from escaping outside the pollution purification target area and The pollutants accompanying them escape from the original position, and the pollutants are purified by the action of the above-mentioned purification liquid. For example, the original position purification method using multi-point injection according to the first aspect of the patent application, wherein the multi-point injection device is further provided with: A monitoring disk for each injection site and a multi-point injection device for controlling the above-described injection pump, flow and pressure measuring device, and centralized management device for the monitoring disk. For example, the original position purification method using the multi-point injection according to the first aspect of the patent application, wherein the injection tube is a bundle collection injection tube formed by collecting a plurality of injection thin tube bundles of the injection tube, and injecting the bundle. The thin tube is disposed at a plurality of contaminated sites, and the purified liquid containing the biodegradable organic matter is injected at a pressure of 1 to 6 liters per minute for each injection tube, and is simultaneously impregnated with a pressure within the limit of the penetration between the soil particles. The flow of the cleaning liquid from each of the injection tubes is limited to each other in the specific area in which the respective injection tubes are responsible, and the escape of the purification liquid to the outside of the pollution-removing target area and the contaminants accompanying the escape are prevented. Easy to escape. An in-situ purification method using a multi-point injection according to the third aspect of the patent application, wherein the injection device includes: a purification liquid tank, the injection pump, the plurality of injection thin tubes, and a conduit for communicating the same; The apparatus has a plurality of injection thin tubes branched from the conduit via a branch valve, and further comprising: a pressure gauge and a flow meter disposed at any one of the injection pump and the injection capillary, and managing the pressure gauge And the controller for measuring and managing the flow meter and the actuation of the branch valve. The original position purification method using multi-point injection according to Item 3 of the patent application, wherein the non-curable purification liquid is prevented from leaking to the ground surface through the gap of the bundle injection pipe by any one or more of the following means, Purify the pollutants in a specific area: (1) Fill the sealed cement slurry between the borehole and the bundled injection tubing (2) a plurality of injection thin tubes are bundled through the separator and the gap between the injection thin tubes is sealed by the separator, and the means for sealing the cement slurry is filled; (3) the bundle collection into the thin tube is set in the sealed cement In the slurry, at least in the position of the contaminated area, the means for injecting the cement slurry into the gap of the upper bundle into the thin tube; (4) providing the bag at the upper part of the at least the contaminated area of the bundled injection tube, inside the bag body (5) In the above (4), a plurality of the bag bodies are provided at intervals in the upper and lower sides, and the bag is disposed between the bag bodies. The means for injecting the cement slurry into the inlet; and (6) injecting the bundle into the thin tube and covering the bag body, and injecting the spout outlet opening means outside the bag body. The original position purification method using multi-point injection according to any one of the first to fifth aspects of the patent application, wherein the above-mentioned purification liquid is a nutrient for activating microorganisms which are active in the original position by using carbohydrate or protein as a main material. Solution. An in-situ purification method using multi-point injection according to any one of claims 1 to 5, wherein the injection tube device used in the multi-point injection comprises: a plurality of purification liquids in the tube axis direction An injection pipe provided at the outlet and covering the check valve of the discharge port and disposed in the borehole, and covering a certain range of the tube axis direction including the portion having the purge liquid discharge port and the check valve at the outer periphery of the injection pipe Cylindrical space guide a column-shaped impregnation source formed by the water component, and a sealing cement slurry filled in a gap between the hole wall of the borehole and the injection pipe and the columnar space water-conducting member; the columnar space water-conducting member has a lower side portion above the pipe axis direction And the side of the wall opposite to the hole is covered by the sealing cement slurry, thereby forming a separate column-shaped permeation source, and the sealing cement slurry has the purification liquid which can be injected into the ground through the injection pipe, the discharge port and the check valve. The discharge liquid is pulverized and the strength is broken, and the cleaning liquid is injected into the specific injection section through the injection pipe, the discharge port, and the check valve through the column-shaped permeation source, and the purification liquid is even The large discharge volume can still be injected into the ground plate at a low pressure, and the purification liquid from other injection zones or other injection pipes can be purified from the plurality of purification liquid discharge ports simultaneously into the ground plate without being reversed in the injection pipe. Contaminants.