JP2014205112A - Original-position decontamination method by multi-point injection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an original-position decontamination method, e.g. bioremediation, which reduces and decontaminates pollutants effectively while suppressing occurrence of parts where permeation of a cleaning solution is insufficient.SOLUTION: In an original-position decontamination method, e.g. bioremediation, flows of a cleaning solution containing a biodegradable organic material from individual injection pipes provided in polluted ground are restricted mutually in individual regions which individual pipes are in charge of by injecting the cleaning solution simultaneously from the injection pipes to decontaminate pollutants under the action of the cleaning solution. The cleaning solution is permeated uniformly into in-charge target ranges by synchronizing the injection permeation of the cleaning solution by multi-point injection so that the injection permeation of the cleaning solution is restricted mutually among the individual in-charge target regions according to individual conditions of ground, in order to prevent occurrence of parts where permeation of the cleaning solution is insufficient.

Description

  The present invention relates to an in-situ purification method for injecting a purification liquid containing biodegradable organic matter into the ground to reduce and purify the concentration of contaminants in soil and groundwater.

  Bioremediation is one of the technologies to purify environmental pollution of soil and groundwater. Bioremediation is a method of penetrating a nutrient solution that activates microorganisms (hereinafter referred to as “purifying solution”) into the target area in the ground.

  The in-situ purification method by bioremediation aims to reduce the concentration of contaminants in soil and groundwater at the in-situ location by injecting a cleaning solution into the contaminated ground through an injection tube.

  As a conventional chemical solution injection method, there is a double packer method in which a ground consolidated material is injected under pressure through an injection pipe built in the ground.

  Therefore, naturally, it is conceivable to apply the conventional injection method for injecting the cleaning liquid into the ground, but according to the applicant's research, these conventional pressure injection methods were not used. It was found that it was difficult to perform in-situ purification because the cleaning solution deviated from the injection target range. The present applicant has found that the reason is that the cleaning liquid does not have a caking property like grout.

  In the double packer method, a plurality of injection sleeves are provided for each 33 cm in one injection tube, and the injection is structurally an injection for each sleeve. The injection points move from the deep sleeve injection to the shallow one by one. In the chemical injection, the grout gelled, and thus an injection effect was obtained by such a method (see FIG. 10).

  There is a method (Patent Document 1) in which a purification material is added to an injection solution (grouting material) accompanied by gelation, and the purification material is included in the gel to detoxify heavy metals. However, gelation is performed like bioremediation. When using a nutrient solution that does not accompany it, in the presence of a gelling agent, the presence of the gel makes it difficult for the purifier to act directly on contaminants, and the infusate penetrates into a highly permeable layer in advance. Due to the solidification, there was a problem that it was difficult for the purification solution to penetrate into the contaminated ground of fine-grained soil.

  In addition, when it is carried out for each stage while pulling up the infiltration stage, it takes time to inject, in particular, it tends to move toward the ground surface, and there is a problem that split injection occurs and it is difficult to infiltrate between soil particles for each predetermined layer. . In addition, the ground is often an alternating layer in which layers of different soils such as sand, silt, and clay are stacked, and in the fine-grained soil layer where contaminants are accumulated, it is split and injected so that the purification solution is difficult to penetrate. There was a problem.

JP 2012-228685 A Japanese Patent No. 4848553 Japanese Patent No. 3455952 Japanese Patent No. 3724644 Japanese Patent No. 5092103 Japanese Patent No. 3762353

  In bioremediation, the purification solution is a non-solidifying aqueous solution in which microbial nutrients are dissolved in water, and its viscosity and underground behavior are almost the same as water. By the way, since such a purifying liquid has no caking property, when it is injected into the ground, it flows to a portion having high water permeability, and when the ground is an alternating layer, it is difficult to permeate into silt and clay. Moreover, the purification solution itself moves together with the groundwater by the injection pressure without affecting the soil permeability.

  On the other hand, the grout material with gelation solidifies after a certain time from the injection. Since the grout material easily permeates into the soil having high water permeability, the water permeability is low relative to the periphery after the grout is injected. For this reason, the caking grout material is greatly different from the non-solidifying purifying material in that the injection material affects the water permeability of the soil. And in the ground consolidation method, if a large water-permeable soil layer such as sand ground was consolidated, the purpose was achieved.

  However, when a purifying solution is used in combination with a grout accompanied by such gelation, there is a problem that water permeability is affected, and penetration into a fine-grained soil layer where contaminants are likely to accumulate is insufficient.

  In addition, the presence of the gel in the contaminated area has a problem that the purification material in the gelled purification liquid is less likely to effectively act on the contaminant because the gel is impermeable to water.

  On the other hand, since a non-curing cleaning solution does not gel when injected, it penetrates to any extent, tends to deviate along a rough layer or layer boundary, and simultaneously extrudes contaminants or accumulates contaminants. It is difficult to in-situ clean up because it is difficult to penetrate into the grain land.

  For example, the injection by the double packer method as shown in FIG. 10 is injection at every depth (usually 33 cm) in one injection tube, but injection at any injection stage (discharge port) (usually a discharge amount of 10 per minute). Liters to 15 liters), and when moving to the next injection stage (discharge port) and injecting, the purifying liquid injected in advance is pushed out by the pressure of the injection, so that the purifying liquid becomes a rough soil layer. As a result, the contaminants are pushed out and diffused easily, and there is a problem that the cleaning solution does not easily act on the contaminants in the fine-grained soil.

  Moreover, when the silica grout with gelation and the purification material are injected in combination (Patent Documents 1 and 3), the purification material in the gelled purification solution does not effectively act on the pollutant, or due to the presence of the gel. There is a problem that the activation of microorganisms in the soil is inhibited. In addition, when a purification material that does not cause gelation is injected, the purification solution is insufficiently penetrated into the ground where the contaminants are distributed by deviating from the soil layer where the purification material easily penetrates. For this reason, there is a problem that the environment of the activity of microorganisms is not sufficiently prepared, and the concentration reduction of the pollutant does not proceed.

  In addition, natural injection is a method in which a purifying solution is infiltrated into the ground by gravity from the ground through a well provided with a perforated tube or slit at the depth of the aquifer, but natural injection has good water permeability. There is a problem that the cleaning solution penetrates into the soil, but does not penetrate into silt or clay.

  Thus, the problem of the prior art is that a site where the penetration of the purification solution is insufficient occurs and the in-situ purification is difficult.

  Therefore, in carrying out bioremediation and the like, it is required to solve the following problems.

(1) In order to clean the in-situ contaminants at a certain position without splitting the non-consolidating cleaning solution and deviating to the ground surface, it must be infiltrated between soil particles at a low pressure. (See FIG. 1).

(2) Since the pollutants are adsorbed on silt / clay of small particles and are present at high concentration in the silt / clay layer, it is necessary that the cleaning solution penetrates into the poorly permeable layer.

(3) The ground is often an alternating layer with multiple layers of different soil properties such as sand, silt and clay. For this reason, it is necessary to penetrate into different soil layers.

(4) Since the distribution of contamination is light and shaded in the plane and depth directions, it is required to infiltrate a purification solution according to the distribution and concentration of contamination for appropriate purification.

(5) It is important to ensure that the cleaning solution penetrates into highly contaminated areas.

(6) As described above, in addition to the injection method of FIG. 8, the injection methods described in Patent Documents 1, 2, 3, and 4 have insufficient purification reaction due to gelation, whereas the above reaction In the case of a non-reactive purification material, since the purification solution is not permeated and held in a predetermined region, contaminants are also pushed out of the original position by the injection pressure. Therefore, it is necessary to inject and purify the purification material at an injection speed within the limit pressure that allows the soil particles to penetrate at the original position without moving the contaminant in which the contaminant exists. The injection rate for this is about 1 to 6 liters / minute (see FIGS. 1 and 2).

(7) In order for the cleaning solution injected into the contaminated ground to infiltrate between the soil particles, it must be injected at a very low pressure, but in that case the construction time will be too long and the construction efficiency must be increased. Therefore, simultaneous injection from a plurality of injection tubes is necessary (see FIG. 2).

  In order to infiltrate the non-consolidating purification solution into fine-grained soil, in order to inject it within the soil particle infiltration limit shown in FIG. 1 under the ground conditions shown in FIG. It turned out that it was 1-6 liter / min from the exit. In order to construct this at an economic speed, from FIG. 2 (a), a plurality of discharge ports are provided or an injection tube is used as an injection tube, and a plurality of tubes are bundled so that the discharge ports are located at different positions. This can be solved by providing these injection pipes in a plurality of injection drill holes and injecting them simultaneously.

  The present invention aims to solve the above-described problems in the prior art.

  The present invention is an in-situ purification method by multi-point injection that purifies contaminated ground by injecting a nutrient solution (purifying solution) that activates microorganisms in the original ground from an injection tube provided in the ground. By simultaneously injecting a purification solution containing biodegradable organic substances from a plurality of injection pipes provided in the contaminated ground, the flow of the purification liquid from each injection pipe is mutually restrained for each predetermined area that each injection pipe takes charge of. Further, it is characterized in that the pollutant is purified by the action of the purification liquid.

  In the present invention, in a soil or waste containing harmful substances, a purification solution is confined to a predetermined region by simultaneously infiltrating between soil particles from a plurality of inlets, and contaminated by purifying the harmful substances and waste. In addition to preventing the diffusion of the region, by injecting the soil purification solution by the above-described method, it is possible to infiltrate the purification solution only in a predetermined region and purify the contaminants in the original position, which is effective.

The hazardous substances in the present invention are heavy metals such as hexavalent chromium, mercury, lead and cadmium, waste mud generated by civil engineering, incinerated ash, sludge, industrial waste, environmental hormones, agricultural chemical residues, organic solvents, organic Organic compounds such as detergents, and ground containing harmful substances that adversely affect the human body and the environment such as dioxins. Examples include alkylmercury, total mercury, cadmium, lead, organic phosphorus, hexavalent chromium, arsenic, cyanide, PCB, trichlorethylene. Tetrachloroethylene, dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 13-dichloropropene, Examples include thiuram, simazine, thiobencarb, benzene, selenium and the like.

  An example of degradation by microorganisms in bioremediation is as follows.

  Organic matter in industrial waste is decomposed by microorganisms such as bacteria and filamentous gold fungi. Ammonia involved in the production of trihalomethane, which is a carcinogen, is decomposed by nitrifying bacteria, and industrial solvent trichlorethylene is decomposed by ammonia oxidizing bacteria. In addition, agricultural chemicals are decomposed by filamentous fungi, bacteria, and radioactive bacteria in the soil.

  These microorganisms are activated by the purification liquid and decompose the pollutants.

  For example, parathion is degraded by the collaboration of Pseudomonas stuzeri and Pseudomonas aeruginosa. Carbamate insecticides are degraded by Penicillium and Trichoderma. Furthermore, PCB is decomposed by Pseudomonas and Alcaligenes, and chlorobenzene is also decomposed by Pseudomonas.

  Examples of soil microorganisms activated by the purification solution include microorganisms, fungi, and bacteria that inhabit plant leaves. Typically, yeast, filamentous fungi, and bacteria.

  The types of microorganisms that inhabit the leaf surface include, for example, the genus Pseudozyma (P.antarctica, P.ruglosa, P.parantarctica, P.aphidis, etc.), Cryptococcus (Cryptococcus laurenti, Cryptococcus flavus, etc.), and others, Rhodotorula Glutinis, Rhodotorula mucilaginosa, Sakaguchia dacryoidea, Sporidiobolus pararpseus and Ustilago maydis are known.

  Examples thereof include Pseudozyma antarctica JCM3941, Pseudozyma antarctica JCM10317, Pseudozyma antarctica JCM3941, Pseudozyma ruglosa JCM10323, Pseudozyma parantarctica JCM11752, and the like.

  Examples of the filamentous fungi include, for example, Acremonium genus, Alternaria genus, Arthrinium genus, Aspergillus genus, Aureobasidium genus, Cladosporium genus, Epicocumcum genus, Exophiala genus, Fusarium genus, Leptosphaeria genus, Paecilomyces genus, Penicillium genus, Phoma genus, Trichoderma genus, Examples include fungi of the genus Pseudotaeniolina, Ulocladium, Phaeosphaeriopsis, and Galactomyces.

  In this way, nutrient sources can be injected in the local contaminated ground, microorganisms in the soil can be activated and propagated, and pollutants can be decomposed.

  The ground improvement construction method using the ground consolidation material is already known in Patent Documents 1, 2, 3, 4, 5, and 6. As an apparatus for multipoint injection of the purifying liquid of the present invention, for example, one having the same mechanism as the apparatus cited as Patent Documents 1, 2, and 4 can be used. The bioremediation purification solution itself is non-curable, and the behavior at the time of injection is different from that of the curable injection solution as described above. Therefore, even if the injection device is used, the method of the present invention is used. It has been found that it is difficult to in-situ clean the pollutant by injecting it into the injection region.

  As the method, first, as shown in FIG. 1, in the present invention, the cleaning solution must be injected within the injection pressure limit within the injection pressure limit that allows the permeation between the soil particles, that is, the injection pressure and the injection rate are within a linear range. The injection rate is 1-6 liters per minute.

  In that case, since the injection speed is very low, economic efficiency cannot be obtained, so the injection speed is increased overall by simultaneously injecting from a large number of outlets, and the injection from each outlet restricts each other. It is necessary to inject so that it can be injected. Therefore, as can be seen from the Darcy law in FIG. 2, the injection rate can be increased at a low pressure by increasing the permeation area A. That is, it becomes possible by using the bundling injection tubule of FIGS.

  For the same reason, when the columnar infiltrated bundling injection tubules shown in FIGS. 5 and 6 are used, the discharge speed per one injection tubule is increased, and the inter-soil particle infiltration shown in FIG. Is possible. Applicant has found that.

  FIG. 5 is a specific example of the present invention. FIG. 5 shows a plurality of injection pipes for injecting a purification liquid containing biodegradable organic substances into the ground at a plurality of injection points, and a plurality of unit pumps for injecting the purification liquid into the ground through the injection pipes. A flow rate / pressure measuring device for measuring the flow rate and / or pressure of the cleaning liquid delivered at each injection point, a monitoring panel for displaying each injection point, the unit pump, and the flow rate / pressure measurement Using a multi-point injection device equipped with a centralized control device for controlling the device and the monitoring panel, the unit pump is operated, the injection point in the monitoring panel, the injection status of the cleaning liquid at each injection point, and the purification to each injection point Each injection can be performed by simultaneously or selectively injecting into multiple injection points while collectively monitoring the liquid delivery status and controlling the unit pump and flow rate / pressure measurement device with a centralized control device. While preventing the flow of the purification solution from each other for each predetermined area of each injection tube and preventing the infiltration of the purification solution, the contaminants are purified by the action of the purification solution. To do.

  7 and 8 show a method for purifying in-situ by preventing the injection of the purifying liquid and the escape of the pollutant in the present invention.

  Each of the liquid feed pump and the drive unit constitutes one unit, is configured to have a plurality of such units and operate independently for each unit, and each unit is controlled collectively as a whole. By controlling the inverter of each liquid feed pump that feeds the purification liquid, the discharge speed of each liquid feed pump can be set easily, and the discharge corresponding to the amount of soil carried by one injection stage The amount and the discharge time required for it are controlled, but even if the injection hole interval and soil quality are different, the boundary surfaces of the receiving areas of the injection pipes in contact with each other in the horizontal and vertical directions are adjacent to each other. Set the injection volume so as to cover the handling area, and synchronize so that injection per stage is completed within the same time. Re is constrained to one another, contaminants will can be effectively cleaned in situ without being pushed out. As the injection tube device at this time, an injection tube as shown in FIGS. 3 to 6 described later can be used.

  That is, according to the volume, permeability coefficient, porosity, etc. of the area of each injection tube, the injection amount, injection speed, or injection pressure of the purification solution is obtained, and the penetration of the purification solution from each injection tube into each region is performed. By synchronizing, the flow of the cleaning liquid can be mutually restrained for each predetermined region that each injection tube takes charge of.

  FIG. 14 shows an infusion device in which an infusion line branches from a single infusion pump to a plurality of infusion tubules via a branch bubble to inject simultaneously or continuously.

  When the present invention is applied as bioremediation, a nutrient solution that activates microorganisms that live in situ can be used as a purification solution, mainly composed of hydrocarbons or proteins.

  Bioremediation uses the activation of microorganisms for purification of pollutants, and uses a purification solution containing microbubbles and nutrients that activate microorganisms that live in situ as the purification solution. If the injection is performed simultaneously or selectively from a plurality of injection pipes provided on the contaminated ground, the purification action of the pollutants can be exhibited more effectively.

  According to the present invention, in the in-situ purification method such as bioremediation, the injection / penetration of the cleaning solution by multi-point injection is performed within the same time so as to restrain each other between the areas to be handled according to the ground conditions. In this case, the purification liquid is uniformly infiltrated into the target area by performing the synchronization so that the predetermined amount of injection is constrained and completed. It is possible to prevent the deviation from being pushed out of the target range.

  In addition, since there is no location where the penetration of the purification liquid is insufficient, and there is no deviation, the contamination can be left in the target range and the purification material can be applied to reduce or purify the contamination.

It is a graph which shows the relationship between the pressure and injection | pouring speed | rate of a non-solidifying purification liquid, and the setting of a limit injection | pouring speed | rate. (a) is a schematic diagram of the columnar permeation characteristics of the non-consolidating purification solution considering the Darcy law. (b) is a table showing the relationship between the ground particles to be injected and the water permeability. It is the figure which showed notionally the relationship between the injection | pouring area | region of the injection pipe in the in-situ purification method of this invention, the injection amount of cleaning liquid, injection | pouring speed, etc. FIG. I, II, III, IV and V indicate soil layers. (a)-(d) is explanatory drawing which shows an example of the injection pipe used for the in-situ purification method of this invention. (A) shows an injection tubule. (B) is a bundling injection tubule, and (c) and (d) are an injection tubule and a bundling injection tubule equipped with a microbubble production apparatus. It is a schematic diagram of a multipoint injection device configured to be able to simultaneously inject the cleaning liquid into the ground of a plurality of injection stages at a plurality of points with a bundle injection capillary. An embodiment of an injection tube device capable of columnar penetration used in a multi-point injection device is shown. (A) is a front view when a plurality of injection tubes are bundled and installed, (b), (c ) Is an enlarged cross-sectional view of the main part. In the in-situ purification method of the present invention, it is conceptually shown to synchronize the injection of the purification liquid from the columnar penetration source of each injection pipe having a responsible area, (a) the synchronization of the entire vertical and horizontal direction (B) is a diagram showing vertical synchronization at one point in the horizontal direction, and (c) is a diagram showing that the permeation of the cleaning liquid is restricted between the handling areas. FIG. 8 is a plan view showing the relationship between the carrying area of FIG. By synchronizing and injecting FIGS. 7 (a), 7 (b) and 8 (a), the ground of FIG. 3 is constrained to each other as shown in FIGS. The position can be purified. It is the figure which showed one Embodiment of the apparatus which inject | pours the cleaning liquid containing a microbubble using a microbubble generator. It is the figure which showed notionally the mode of the diffusion movement of the pollutant by the conventional construction method which inject | pours the bioremediation purification liquid by a double packer construction method. (a)-(d) is the figure which showed the example of the injection pipe structure which prevented the purification | cleaning liquid from escaping to the ground surface. The example of the separator which mounts | wears with an injection | pouring thin tube is shown, (a) is an elevation view, (b) is a top view. An example of a bundling injection tubule provided with a columnar water guiding member is shown, (a) is an elevation view, (b) is a horizontal sectional view, and (c) is an enlarged view. (a), (b) is a schematic diagram showing an example of an injection system of the present invention.

  FIGS. 1 to 3 are diagrams conceptually showing the relationship between the receiving area of each injection tube, the injection amount of the cleaning liquid, the injection speed and the like by multi-point injection in the in-situ purification method of the present invention.

In FIG. 3, the target ground for contamination purification is divided into five layers I to V. The water permeability coefficient of each layer is represented by K _i , the porosity is α _i , the handling volume is V _i , the cleaning liquid injection amount is L _i , and the discharge amount per minute is l _i .

In the present invention, the purification solution injection / penetration by multi-point injection is basically performed by synchronizing so as to be constrained to each other between the areas to be handled according to the ground conditions. According to the volume V _i , the water permeability coefficient K _i , and the porosity α _i , the purifying liquid is uniformly infiltrated into the target range by determining and injecting the purifying liquid injection amount L _i and the discharge amount l _i per minute. It is possible to prevent the occurrence of insufficient penetration.

  4 (a) to 4 (d) show an example of an injection pipe inserted into the ground when the in-situ purification method of the present invention is carried out. Among these, there are a plurality of injection pipes shown in (b) and (d). The injection tubules 2a are formed by shifting the distal end discharge port 5 of each injection tubule 2a by a certain length in the tube axis direction and binding them into one bundle.

  In addition, the injection tube shown in (c), (d) is connected to a microbubble generating device, in which microbubbles are mixed into the purification liquid in order to further promote the activation of aerobic microorganisms by supplying air, It is configured to allow injection.

  By being configured in this way, the purification liquid or the purification liquid mixed with microbubbles is simultaneously or plurally provided to a plurality of stages (stratum) having different depths from the distal end discharge port 5 of each injection capillary 2a. Can be arbitrarily selected and co-injected.

  An example of a VOC (volatile organic compound) purification method according to the present invention will be described below.

  The pollutants to be purified are tetrachloroethylene and trichlorethylene, and are purified by the multi-point injection method.

  The purification solution is an organic substance mainly composed of carbohydrates and proteins, which is biodegradable and metabolized by microorganisms that are nutrient sources for microorganisms, preferably sugars that are metabolized and decomposed by microorganisms in the soil. Use.

  Specific examples include monosaccharides such as glucose and fructose, disaccharides such as sucrose, maltose and galactose, other oligosaccharides, polysaccharides such as starch and maltodextrin, and other saccharides.

The purification principle is as follows.
(1) The aerobic microorganisms that originally live in the ground are activated by the purification solution that has penetrated the ground.
(2) Aerobic microorganisms consume underground oxygen and form an anaerobic atmosphere (a state with little oxygen).

(3) Anaerobic microorganisms are activated by the cleaning solution. Organic substances in the cleaning liquid are decomposed by anaerobic microorganisms, and hydrogen (H) is generated.
(4) Anaerobic microorganisms decompose the VOC chlorine (Cl) by replacing it with hydrogen (H).

(5) When VOC is lost, anaerobic microorganisms decrease after consuming the cleaning solution and return to the original environment.
(6) With regard to the purification solution, when a purification solution containing microbubbles is used, air is supplied and the activation of aerobic microorganisms is further promoted, and the contaminants can be effectively purified.

  In order to purify the above purification principle in-situ in a heterogeneous contaminated ground, the present invention uses the following method.

  5 and 6 show a multi-point injection apparatus configured to be able to simultaneously inject a non-curable cleaning liquid containing a biodegradable organic substance into a plurality of injection stages A, B, C, and D at a plurality of injection points. This shows the purification method.

  The multi-point injection apparatus using the columnar osmotic injection tubule can easily perform the above-described synchronization injection. In the figure, reference numeral 5 denotes a discharge port, and a check valve 5a such as a rubber sleeve covering the discharge port 5 is a columnar water guiding member made of a film, a mat, a net-like body, or a belt-like body having a slit covering it. The purification liquid is discharged from the entire columnar permeation source 7 from the discharge port 5 through the check valve 5 a and the columnar space water guiding member 6. For this reason, it is injected at a low pressure from a large permeation source (FIG. 2).

  In the figure, the injection pipe 2 of the injection pipe device shown in FIG. 6 is built in each drilling hole 1 formed at each of a plurality of injection points, the tip of each injection pipe 2 is closed, and the side of the tip is One or a plurality of purification liquid discharge ports 5 are formed, and a check valve 5a and a columnar space water guide member 6 are respectively attached.

  Furthermore, the tip of each injection tube 2 configured in this way is arranged so as to be positioned at a predetermined interval in the depth direction of the drilling hole 1. A seal grout 4 is filled in a gap 3 between the hole wall of the hole 1 and each injection tube 2 over a predetermined length. With such a configuration, a plurality of columnar permeation sources 7 having continuous sections L in the tube axis direction are formed in the gap 3 between the drilling hole 1 and the injection tube 2 at predetermined intervals in the tube axis direction.

  By using such a columnar osmotic injection method, a single-stage injection source can be made long, so even if the injection rate per stage is increased, injection can be performed at a low pressure, so that movement of contaminants can be prevented and binding can be performed. Since the diameter of the injection tube is reduced, an effect that the diameter of the drilling hole can be reduced is produced.

  Further, as shown in FIG. 5, a plurality of unit pumps 12 for injecting the purification liquid into the ground through the injection pipe 2, and the flow rate and / or pressure of the purification liquid to be sent at each injection point A flow rate / pressure measuring device 13 for measuring, a monitoring panel for displaying each injection point in liquid crystal form, and a centralized management device 17 for controlling the unit pump 12, the flow rate / pressure measuring device 13 and the monitoring panel. The unit pump 12 is operated using the provided multi-point injection device, and the monitoring panel is used to collectively monitor the injection point, the supply state of the purification liquid at each injection point, and the supply state of the purification liquid to each injection point While the unit pump 12 and the flow rate / pressure measuring device 13 are controlled by the centralized management device 17, the flow of the cleaning liquid can be made by simultaneously or selectively injecting into a plurality of injection points. And flux, the permeate insufficient portion of the cleaning liquid is prevented from occurring, to purify the pollutants in the predetermined region.

  That is, a purification liquid storage tank 10 in which a purification liquid is stored is connected to each injection pipe 2 via a conduit 11, and the injection material is pumped to each injection pipe 2 from the injection material storage tank 10 to each injection pipe 2. Are connected to a unit pump 12, a flow rate / pressure detection device 13 for detecting the flow rate and pressure of the cleaning liquid at each injection point, and a valve 14 for starting and blocking the pumping of the cleaning liquid.

  Each unit pump 12 includes a rotational speed transmission 15 such as an inverter, and is configured to be individually operated by an independent drive source 16 such as a motor. Further, each unit pump 12, the rotational speed transmission 15, the flow rate pressure detector 13 and the valve 14 are respectively connected to a centralized management device 17, and all are individually controlled by the centralized management device 17.

  In such a configuration, when a flow rate and / or pressure data signal from the flow rate / pressure detection device 13 is transmitted to the central control device 17, the unit pump 12 is operated from the storage tank 10 to each injection pipe 2 respectively. The cleaning liquid is pumped at an arbitrary injection speed, injection pressure, and injection amount.

  At a plurality of injection points, the purification liquid is simultaneously or selectively discharged from the purification liquid discharge port 2a of each injection pipe 2 to the columnar penetration source 7 and further penetrates simultaneously from the columnar penetration source 7 into the surrounding ground. By being injected, it is possible to simultaneously inject the cleaning liquid into the ground of the plurality of injection stages A, B, C, D at a plurality of injection points.

  In the in-situ purification method of the present invention, FIG. 7 and FIG. 8 are conceptual diagrams of the improvement rate and the improved shape when the purification liquid is synchronized and the penetration of the purification liquid to the outside of the handling area is restricted. Synchronizing means that the injection of the receiving volume of adjacent injection capillaries is completed within the same time, and the purifying solution is infiltrated so as to constrain its boundary surface or injection range.

  By simultaneously injecting the purification solution from a plurality of injection pipes simultaneously, the purification solution can be contained in a predetermined range at a maximum discharge speed for each soil layer and at a low pressure that does not cause soil particles to move or crack. By purifying, the purifying liquid can be uniformly distributed from the injection pipe without extruding the purifying liquid injected at other depths or without extruding the contaminants and diffusing to the outside.

  In performing the multi-point injection method, it is desirable to perform the injection periods at adjacent depths without a time difference. The occurrence of a time difference means a state in which one injection is completed in advance and the other adjacent is continuing the injection. At that time, the purification liquid on the side that has been finished in advance is pushed out together with the contaminants from the other side by the injection pressure.

  In order to infiltrate the purification solution into the target range and prevent the occurrence of insufficient penetration, it is desirable to align the injection time at each depth in the multi-point injection method.

  In the apparatus of FIG. 5 described above, the injection pipe apparatus has a plurality of cleaning liquid discharge ports 5 and a check valve 5a covering the discharge ports 5 in the tube axis direction as shown in FIG. And a column-shaped space water guide member 6 attached to cover an outer peripheral portion of the injection tube 2 including a portion having the purification liquid discharge port 5 and the check valve 5a in a tube axis direction. The columnar seepage source 7 and a seal grout 4 filled in the gap between the hole wall of the drilling hole 1 and the injection pipe 2 and the columnar space water guide member 6, the columnar space water guide members 6 are arranged on both the upper and lower sides in the tube axis direction. The side wall part and the hole wall side part are covered with a seal grout 4 to form an independent column penetration source 7, and the seal grout 4 is injected into the ground via the injection pipe 2, the discharge port 5 and the check valve 5a. It is strong enough to be crushed by the discharge pressure of the cleaning liquid, and the columnar immersion By breaking the seal grout 4 from the source 7 and injecting it into a predetermined injection stage, even a large discharge amount is injected into the ground at a low pressure, and the cleaning liquid from other injection stages or from other injection pipes is injected into the injection pipe. It is configured to be injected into the ground for each independent injection stage without backflowing into the ground.

  In the present invention, the plurality of purification liquids discharged simultaneously from the plurality of discharge ports 5 are unlikely to be mixed because the flowing liquid layers repel each other due to the osmotic pressure, and therefore the injection liquid is layered horizontally in the ground. Focused on the penetration.

  Since the phenomenon that the purification liquid penetrates in the horizontal direction without substantially escaping to the ground surface occurs, it becomes possible to purify the contaminated ground at once in both the vertical and horizontal directions.

  Accordingly, in the present invention, low-pressure injection that allows the maximum discharge speed for each soil layer and permeation between the soil grain holes can be performed from one discharge port, and the osmotic pressures of the adjacent cleaning liquids repel each other to cause layered permeation. Therefore, it is possible to continue permeation for a long time without clogging at a low pressure and with a large discharge amount.

  Thus, in the present invention, if the plurality of stages permeate at the same time, the flow in the upper layer and the lower layer of the cleaning liquid is constrained by each other's osmotic pressure. Found to penetrate. The injection solution is injected by selecting an injection speed and an injection amount according to the state of the soil layer of each stage.

  By bundling a plurality of thin tubes so that the discharge ports are positioned at intervals in the axial direction, optimum injection can be simultaneously achieved for each of these layers even on the ground having a different ground condition. Moreover, three-dimensional simultaneous injection in the vertical and horizontal directions in the ground is also possible.

  In the present invention, it is extremely effective to use microbubbles for the purification liquid. That is, with regard to the purification liquid, when a purification liquid containing microbubbles is used, oxygen in the microbubbles is supplied, activation of aerobic microorganisms is further promoted, and contaminants can be effectively purified.

  FIGS. 9A to 9C show an embodiment of a microbubble generator for injecting a cleaning solution containing microbubbles in the in-situ purification method of the present invention.

  In FIG. 9A, reference numeral 64 denotes a bubble generator (vortex generator) for generating a purified liquid mixed with microbubbles (fine bubbles), and 65 denotes a purified liquid that is fed into the bubble generator. A liquid tank and a reference numeral 66 are injection pipes for injecting the purified liquid stirred, mixed and dissolved in the bubble generator 64 into the ground.

  The bubble generator 64 incorporates an impeller 64a that rotates at high speed by power (see FIG. 9C), and is connected to a liquid feed pipe 67 extending from the purification liquid tank 65 and an air pipe 68 for taking in air. A pressure feed pipe 69 extending to an injection pipe 66 for injecting the purified liquid and gas mixed and dissolved in the bubble generator 64 into the ground is connected. Valves 70 are respectively attached to the liquid feeding pipe 67, the air pipe 68 and the pressure feeding pipe 69.

  In such a configuration, when the impeller 64a in the bubble generating device 64 is rotated at high speed by power, the cleaning liquid is sucked into the device 64 from the cleaning liquid tank 65 through the liquid feeding pipe 67 and simultaneously through the air pipe 68. Then, air is sucked into the device 64.

  Then, after the cleaning liquid and the air are stirred, mixed, and dissolved in the device 64 by the impeller 64a that rotates at high speed, the purified liquid and air are pumped to the injection pipe 66 through the pressure feeding pipe 69 and injected into the ground from the injection pipe 66. The

  According to this embodiment, a pressurized tank, a solution circulation pump, a compressor and the like are not necessary, and the apparatus can be greatly simplified.

  On the other hand, in FIG. 9B, reference numeral 64 is a bubble generator, and 65 is a purification liquid tank. The bubble generating device 64 circulates the purification liquid in the purification liquid tank 65 through the liquid feeding pipe 67 to generate microbubbles in the purification liquid and generate the purification liquid in which the microbubbles are mixed.

  Reference numeral 71 denotes a raw material liquid mixing mixer that mixes the raw material liquid of the purification liquid, and 72 pressure-feeds the purification liquid mixed with the microbubbles generated in the purification liquid tank 65 to the injection pipe 66 through the pressure feeding pipe 69. And an infusion pump for injecting a cleaning liquid mixed with microbubbles into the ground through an infusion tube 66.

  In such a configuration, when the impeller 64a in the device 64 is rotated at high speed by power, the cleaning solution in the cleaning solution tank 65 is sucked through the liquid feeding pipe 67 and simultaneously into the device 64 through the air pipe 68. Air is aspirated. Then, after the purifying liquid and air are stirred, mixed, and dissolved in the device 64, it returns to the purifying liquid tank 65 through the liquid feeding pipe 67.

  In this way, the purification liquid in the purification liquid tank 65 circulates between the purification liquid tank 65 and the device 64 via the liquid feeding pipe 67, thereby generating the purification liquid in which the microbubbles are mixed in the purification liquid tank 65. Is done. Further, when the injection pump 72 is operated, the purification liquid mixed with the microbubbles in the purification liquid tank 65 is pumped to the injection pipe 66 through the pressure feed pipe 69 and is injected into the ground from the injection pipe 66.

  The above shows an example of a method of mixing microbubbles into the cleaning liquid used in the present invention and injecting the bubbles into the ground, but the method of mixing microbubbles is not limited to this. For example, the microbubble liquid may be circulated while mixing in the sealed purification liquid.

  Further, as shown in FIG. 9 (a), it may be injected directly into the ground from the bubble generating device through a pressure feed pipe, and as shown in FIG. 9 (b), the purification liquid tank and the bubble generating device are circulated. You may inject | pour into the ground through an infusion pump.

  11 and 12 show an example of an injection tube device used in the present invention.

  Conventionally, in the case of injecting a caustic grout from a bundling injection capillary 2A formed by bundling injection tubules 2a, if the bundling injection tubule 2A is installed in a seal grout 4 in a drilling hole, the injection tubules 2a of the bundling injection tubule 2A are connected to each other. Even if there was a space, there was no problem because the caking grout and the seal grout 4 in the drilling hole reacted to consolidate and close the space.

  However, since the purification liquid is non-solidifying as described above, when the bundling injection thin tube 2A is used, even if the bundling injection thin tube 2A is installed in the seal grout 4, the gap between the injection thin tubes 2a is not sufficiently filled. Therefore, it is difficult for the cleaning liquid to flow out to the ground from the gap between the injection thin tubes 2a and be injected into a predetermined region. For this purpose, the following method is used.

(1) A method in which the gap between the injection capillaries 2a in the bundle injection capillaries 2A as well as in the drilling holes is filled with the seal grout 4. For this purpose, a seal grout injection tube 21 is provided in the bundle injection capillary 2A to seal the gap (injection tube 21 for seal grout in FIG. 11). The seal grout injection tube 21 may be removed together with the seal grout injection.
(2) A method in which the separator 30 is provided in the bundle injection capillary 2A and installed in the seal grout 4 in the drilled ground (see FIG. 12).

(3) A method for injecting the grout into the seal grout 4 by providing the bundling injection capillaries 2A in the seal grout 4 at least above the gap and the contamination area of the bundling injection capillaries 2A located above the contamination area (see FIG. 11 (d)). .
(4) A method in which a bag body 23 is provided at least above the contaminated region of the binding injection capillary 2A, and a solidified material is injected into the bag body 23 to block the gap between the binding injection capillary 2A (FIG. 11 (a)). , (B), (c)).

(5) A method of providing a plurality of bag bodies 23 in (4) and injecting grout from the inlets provided between the bag bodies 23 (see FIGS. 11A and 11B).
(6) A method of wrapping the bundle injection tube 2A with the bag body 9 and opening the injection / discharge port outside the bag body 9 (see FIG. 13).

  FIG. 14 shows the injection system of the present invention.

FIG. 14 (a) shows a system in which the cleaning solution is injected simultaneously or continuously from a single injection pump into a plurality of injection capillaries (bundling injection capillaries) via branch bubbles. The controller controls the injection pressure, injection speed, and injection volume, and operates the bubble and injection pump. Each of the injection tubes 2 may be an injection capillary tube, or four injection capillary tubes 2 may be bundled.
FIG. 14B shows an example using the microbubble generator of FIG.

  The purification solution was injected by (A) the conventional double packer method and (B) the multi-point injection method of the present invention to evaluate the penetration of the purification solution. The amount of the purification solution with a total organic carbon concentration of 100 mg / L or more was designed and injected into the soil having a radius of 1 m from the injection point.

  Table 1 shows the distribution of the cleaning solution at the specified distance from the injection point in each method according to the total organic carbon concentration.

  According to Table 1, in the conventional technique (double packer method), a width of 485 to 45 mg / L is seen in the total organic carbon at each depth at a position of 0.5 m from the injection well. At a position 1.0 m from the injection tube, it was 93 to 20 mg / L, and the total width was 485 to 20 mg / L.

  On the other hand, in the method of the present invention (multi-point injection method in which FIG. 3 is arranged as shown in FIG. 5), a width of 291 to 234 mg / L is seen in the total organic carbon at every depth of 0.5 m from the injection well. . At a position of 1.0 m from the injection well, it was 228 to 108 mg / L, and the width was 291 to 108 mg / L as a whole.

  Compared to the prior art, the inventive method suppresses variations with respect to the designed total organic carbon concentration of 100 mg / L. That is, it can be seen that there is no portion where the purification liquid is not sufficiently penetrated.

DESCRIPTION OF SYMBOLS 1 ... Drilling hole, 2 ... Injection pipe, 2A ... Bundling injection thin tube, 2a ... Injection thin tube, 3 ... Gap, 4 ... Seal grout, 5 ... Discharge port, 5a ... Check valve, 6 ... Columnar space water conveyance member, 7 ... Columnar penetration source,
DESCRIPTION OF SYMBOLS 10 ... Purified liquid storage tank, 11 ... Conduit, 12 ... Unit pump, 13 ... Flow volume / pressure detection apparatus, 14 ... Check valve, 15 ... Rotational speed transmission, 16 ... Drive source, 17 ... Central control apparatus, 18 ... Injection inner tube lifting device, 19 ... injection stage management device,
21 ... Seal grout injection tube, 21a ... Discharge port, 22 ... Injection capillary fixing plate, 23 ... Bag packer, 24 ... Grout injection tube, 24a ... Discharge port,
30 ... Separator, 31 ... Injection capillary fitting hole, 32 ... Seal grout injection tube,
64 ... Bubble generator, 65 ... Purified liquid tank, 66 ... Injection pipe, 67 ... Liquid feed pipe, 68 ... Air pipe, 69 ... Pressure feed pipe, 70 ... Valve, 71 ... Raw material liquid blending mixer, 72 ... Injection pump

  The present invention relates to an in-situ purification method for injecting a purification liquid containing biodegradable organic matter into the ground to reduce and purify the concentration of contaminants in soil and groundwater.

  Bioremediation is one of the technologies to purify environmental pollution of soil and groundwater. Bioremediation is a method of penetrating a nutrient solution that activates microorganisms (hereinafter referred to as “purifying solution”) into the target area in the ground.

  The in-situ purification method by bioremediation aims to reduce the concentration of contaminants in soil and groundwater at the in-situ location by injecting a cleaning solution into the contaminated ground through an injection tube.

  As a conventional chemical solution injection method, there is a double packer method in which a ground consolidated material is injected under pressure through an injection pipe built in the ground.

  Therefore, naturally, it is conceivable to apply the conventional injection method for injecting the cleaning liquid into the ground, but according to the applicant's research, these conventional pressure injection methods were not used. It was found that it was difficult to perform in-situ purification because the cleaning solution deviated from the injection target range. The present applicant has found that the reason is that the cleaning liquid does not have a caking property like grout.

In the double packer method, a plurality of injection sleeves are provided for each 33 cm in one injection tube, and the injection is structurally an injection for each sleeve. The injection points move from the deep sleeve injection to the shallow one by one. In the chemical injection, the grout gelled, so that the injection effect was obtained by such a method (see FIG. 9 ).

  There is a method (Patent Document 1) in which a purification material is added to an injection solution (grouting material) accompanied by gelation, and the purification material is included in the gel to detoxify heavy metals. However, gelation is performed like bioremediation. When using a nutrient solution that does not accompany it, in the presence of a gelling agent, the presence of the gel makes it difficult for the purifier to act directly on contaminants, and the infusate penetrates into a highly permeable layer in advance. Due to the solidification, there was a problem that it was difficult for the purification solution to penetrate into the contaminated ground of fine-grained soil.

  In addition, when it is carried out for each stage while pulling up the infiltration stage, it takes time to inject, in particular, it tends to move toward the ground surface, and there is a problem that split injection occurs and it is difficult to infiltrate between soil particles for each predetermined layer. . In addition, the ground is often an alternating layer in which layers of different soils such as sand, silt, and clay are stacked, and in the fine-grained soil layer where contaminants are accumulated, it is split and injected so that the purification solution is difficult to penetrate. There was a problem.

JP 2012-228685 A Japanese Patent No. 4848553 Japanese Patent No. 3455952 Japanese Patent No. 3724644 Japanese Patent No. 5092103 Japanese Patent No. 3762353

  In bioremediation, the purification solution is a non-solidifying aqueous solution in which microbial nutrients are dissolved in water, and its viscosity and underground behavior are almost the same as water. By the way, since such a purifying liquid has no caking property, when it is injected into the ground, it flows to a portion having high water permeability, and when the ground is an alternating layer, it is difficult to permeate into silt and clay. Moreover, the purification solution itself moves together with the groundwater by the injection pressure without affecting the soil permeability.

  On the other hand, the grout material with gelation solidifies after a certain time from the injection. Since the grout material easily permeates into the soil having high water permeability, the water permeability is low relative to the periphery after the grout is injected. For this reason, the caking grout material is greatly different from the non-solidifying purifying material in that the injection material affects the water permeability of the soil. And in the ground consolidation method, if a large water-permeable soil layer such as sand ground was consolidated, the purpose was achieved.

  However, when a purifying solution is used in combination with a grout accompanied by such gelation, there is a problem that water permeability is affected, and penetration into a fine-grained soil layer where contaminants are likely to accumulate is insufficient.

  In addition, the presence of the gel in the contaminated area has a problem that the purification material in the gelled purification liquid is less likely to effectively act on the contaminant because the gel is impermeable to water.

  On the other hand, since a non-curing cleaning solution does not gel when injected, it penetrates to any extent, tends to deviate along a rough layer or layer boundary, and simultaneously extrudes contaminants or accumulates contaminants. It is difficult to in-situ clean up because it is difficult to penetrate into the grain land.

For example, the injection by the double packer method as shown in FIG. 9 is injection at every depth (usually 33 cm) in one injection tube, but injection at any injection stage (discharge port) (usually a discharge amount of 10 per minute). Liters to 15 liters), and when moving to the next injection stage (discharge port) and injecting, the purifying liquid injected in advance is pushed out by the pressure of the injection, so that the purifying liquid becomes a rough soil layer. As a result, the contaminants are pushed out and diffused easily, and there is a problem that the cleaning solution does not easily act on the contaminants in the fine-grained soil.

  Moreover, when the silica grout with gelation and the purification material are injected in combination (Patent Documents 1 and 3), the purification material in the gelled purification solution does not effectively act on the pollutant, or due to the presence of the gel. There is a problem that the activation of microorganisms in the soil is inhibited. In addition, when a purification material that does not cause gelation is injected, the purification solution is insufficiently penetrated into the ground where the contaminants are distributed by deviating from the soil layer where the purification material easily penetrates. For this reason, there is a problem that the environment of the activity of microorganisms is not sufficiently prepared, and the concentration reduction of the pollutant does not proceed.

  In addition, natural injection is a method in which a purifying solution is infiltrated into the ground by gravity from the ground through a well provided with a perforated tube or slit at the depth of the aquifer, but natural injection has good water permeability. There is a problem that the cleaning solution penetrates into the soil, but does not penetrate into silt or clay.

  Thus, the problem of the prior art is that a site where the penetration of the purification solution is insufficient occurs and the in-situ purification is difficult.

  Therefore, in carrying out bioremediation and the like, it is required to solve the following problems.

(1) In order to clean the in-situ contaminants at a certain position without splitting the non-consolidating cleaning solution and deviating to the ground surface, it must be infiltrated between soil particles at a low pressure. (See FIG. 1).

(2) Since the pollutants are adsorbed on silt / clay of small particles and are present at high concentration in the silt / clay layer, it is necessary that the cleaning solution penetrates into the poorly permeable layer.

(3) The ground is often an alternating layer with multiple layers of different soil properties such as sand, silt and clay. For this reason, it is necessary to penetrate into different soil layers.

(4) Since the distribution of contamination is light and shaded in the plane and depth directions, it is required to infiltrate a purification solution according to the distribution and concentration of contamination for appropriate purification.

(5) It is important to ensure that the cleaning solution penetrates into highly contaminated areas.

(6) As described above, in addition to the injection method of FIG. 8, the injection methods described in Patent Documents 1, 2, 3, and 4 have insufficient purification reaction due to gelation, whereas the above reaction In the case of a non-reactive purification material, since the purification solution is not permeated and held in a predetermined region, contaminants are also pushed out of the original position by the injection pressure. Therefore, it is necessary to inject and purify the purification material at an injection speed within the limit pressure that allows the soil particles to penetrate at the original position without moving the contaminant in which the contaminant exists. The injection rate for this is about 1 to 6 liters / minute (see FIGS. 1 and 2).

(7) In order for the cleaning solution injected into the contaminated ground to infiltrate between the soil particles, it must be injected at a very low pressure, but in that case the construction time will be too long and the construction efficiency must be increased. Therefore, simultaneous injection from a plurality of injection tubes is necessary (see FIG. 2).

  In order to infiltrate the non-consolidating purification solution into fine-grained soil, in order to inject it within the soil particle infiltration limit shown in FIG. 1 under the ground conditions shown in FIG. It turned out that it was 1-6 liter / min from the exit. In order to construct this at an economic speed, from FIG. 2 (a), a plurality of discharge ports are provided or an injection tube is used as an injection tube, and a plurality of tubes are bundled so that the discharge ports are located at different positions. This can be solved by providing these injection pipes in a plurality of injection drill holes and injecting them simultaneously.

  The present invention aims to solve the above-described problems in the prior art.

The present invention purifies contaminated ground by injecting a nutrient solution (non-solidifying purification solution ) into a plurality of injection points of the contaminated ground through a plurality of injection pipes provided in the ground. In-situ purification method by injection, a plurality of injection pipes for injecting non-solidifying purification liquid containing biodegradable organic matter into the ground at a plurality of injection points, and into the ground through the injection pipe A multi-point injection device comprising one or a plurality of injection pumps for injecting the purification solution and a flow rate / pressure measurement device for measuring the flow rate and / or pressure of the purification solution sent at each injection point The injection amount and the injection speed of the purification liquid are determined according to the volume, permeability coefficient, and porosity of the area in which each injection tube is handled, and the state of injection of the purification liquid at each injection point and the purification liquid at each injection point The infusion pump is controlled according to the liquid feeding situation. Purification by synchronizing so that a predetermined amount of injection is constrained and completed within the same time period so that the penetration of the purification liquid from each injection tube into each region is constrained between the respective target areas It prevents the occurrence of locations where liquid penetration is insufficient, prevents the cleaning liquid from moving outside the contamination target area , and prevents the contamination from deviating from the original position. It is characterized by purifying.

  In the present invention, in a soil or waste containing harmful substances, a purification solution is confined to a predetermined region by simultaneously infiltrating between soil particles from a plurality of inlets, and contaminated by purifying the harmful substances and waste. In addition to preventing the diffusion of the region, by injecting the soil purification solution by the above-described method, it is possible to infiltrate the purification solution only in a predetermined region and purify the contaminants in the original position, which is effective.

  The hazardous substances in the present invention are heavy metals such as hexavalent chromium, mercury, lead and cadmium, waste mud generated by civil engineering, incinerated ash, sludge, industrial waste, environmental hormones, agricultural chemical residues, organic solvents, organic Organic compounds such as detergents, and ground containing harmful substances that adversely affect the human body and the environment such as dioxins. Examples include alkylmercury, total mercury, cadmium, lead, organic phosphorus, hexavalent chromium, arsenic, cyanide, PCB, trichlorethylene. Tetrachloroethylene, dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, 13-dichloropropene, Examples include thiuram, simazine, thiobencarb, benzene, selenium and the like.

  An example of degradation by microorganisms in bioremediation is as follows.

  Organic matter in industrial waste is decomposed by microorganisms such as bacteria and filamentous gold fungi. Ammonia involved in the production of trihalomethane, which is a carcinogen, is decomposed by nitrifying bacteria, and industrial solvent trichlorethylene is decomposed by ammonia oxidizing bacteria. In addition, agricultural chemicals are decomposed by filamentous fungi, bacteria, and radioactive bacteria in the soil.

  These microorganisms are activated by the purification liquid and decompose the pollutants.

  For example, parathion is degraded by the collaboration of Pseudomonas stuzeri and Pseudomonas aeruginosa. Carbamate insecticides are degraded by Penicillium and Trichoderma. Furthermore, PCB is decomposed by Pseudomonas and Alcaligenes, and chlorobenzene is also decomposed by Pseudomonas.

  Examples of soil microorganisms activated by the purification solution include microorganisms, fungi, and bacteria that inhabit plant leaves. Typically, yeast, filamentous fungi, and bacteria.

  The types of microorganisms that inhabit the leaf surface include, for example, the genus Pseudozyma (P.antarctica, P.ruglosa, P.parantarctica, P.aphidis, etc.), Cryptococcus (Cryptococcus laurenti, Cryptococcus flavus, etc.), and others, Rhodotorula Glutinis, Rhodotorula mucilaginosa, Sakaguchia dacryoidea, Sporidiobolus pararpseus and Ustilago maydis are known.

  Examples thereof include Pseudozyma antarctica JCM3941, Pseudozyma antarctica JCM10317, Pseudozyma antarctica JCM3941, Pseudozyma ruglosa JCM10323, Pseudozyma parantarctica JCM11752, and the like.

  Examples of the filamentous fungi include, for example, Acremonium genus, Alternaria genus, Arthrinium genus, Aspergillus genus, Aureobasidium genus, Cladosporium genus, Epicocumcum genus, Exophiala genus, Fusarium genus, Leptosphaeria genus, Paecilomyces genus, Penicillium genus, Phoma genus, Trichoderma genus, Examples include fungi of the genus Pseudotaeniolina, Ulocladium, Phaeosphaeriopsis, and Galactomyces.

  In this way, nutrient sources can be injected in the local contaminated ground, microorganisms in the soil can be activated and propagated, and pollutants can be decomposed.

  The ground improvement construction method using the ground consolidation material is already known in Patent Documents 1, 2, 3, 4, 5, and 6. As an apparatus for multipoint injection of the purifying liquid of the present invention, for example, one having the same mechanism as the apparatus cited as Patent Documents 1, 2, and 4 can be used. The bioremediation purification solution itself is non-curable, and the behavior at the time of injection is different from that of the curable injection solution as described above. Therefore, even if the injection device is used, the method of the present invention is used. It has been found that it is difficult to in-situ clean the pollutant by injecting it into the injection region.

  As the method, first, as shown in FIG. 1, in the present invention, the cleaning solution must be injected within the injection pressure limit within the injection pressure limit that allows the permeation between the soil particles, that is, the injection pressure and the injection rate are within a linear range. The injection rate is 1-6 liters per minute.

  In that case, since the injection speed is very low, economic efficiency cannot be obtained, so the injection speed is increased overall by simultaneously injecting from a large number of outlets, and the injection from each outlet restricts each other. It is necessary to inject so that it can be injected. Therefore, as can be seen from the Darcy law in FIG. 2, the injection rate can be increased at a low pressure by increasing the permeation area A. That is, it becomes possible by using the bundling injection tubule of FIGS.

  For the same reason, when the columnar infiltrated bundling injection tubules shown in FIGS. 5 and 6 are used, the discharge speed per one injection tubule is increased, and the inter-soil particle infiltration shown in FIG. Is possible. Applicant has found that.

FIG. 5 is a specific example of the present invention. FIG. 5 shows a plurality of injection pipes for injecting a purification liquid containing biodegradable organic substances into the ground at a plurality of injection points, and a plurality of unit pumps for injecting the purification liquid into the ground through the injection pipes. (Infusion pump) , a flow rate / pressure measuring device for measuring the flow rate and / or pressure of the purified liquid sent at each injection point, a monitoring panel for displaying each injection point, the unit pump, Using a multi-point injection device equipped with a flow rate / pressure measurement device and a centralized control device for controlling the monitoring panel, the unit pump is operated to inject the injection point in the monitoring panel, the injection status of the cleaning liquid at each injection point, and each injection Simultaneously or selectively inject into multiple injection points while monitoring the pumping status of the cleaning liquid to the point and controlling the unit pump and flow rate / pressure measuring device with a centralized control device Further, the flow of the cleaning liquid from each injection pipe is mutually restrained for each predetermined region that each injection pipe takes charge of, while preventing the occurrence of a location where the penetration of the cleaning liquid is insufficient, and the action of the cleaning liquid To purify pollutants.

  7 and 8 show a method for purifying in-situ by preventing the injection of the purifying liquid and the escape of the pollutant in the present invention.

  Each of the liquid feed pump and the drive unit constitutes one unit, is configured to have a plurality of such units and operate independently for each unit, and each unit is controlled collectively as a whole. By controlling the inverter of each liquid feed pump that feeds the purification liquid, the discharge speed of each liquid feed pump can be set easily, and the discharge corresponding to the amount of soil carried by one injection stage The amount and the discharge time required for it are controlled, but even if the injection hole interval and soil quality are different, the boundary surfaces of the receiving areas of the injection pipes in contact with each other in the horizontal and vertical directions are adjacent to each other. Set the injection volume so as to cover the handling area, and synchronize so that injection per stage is completed within the same time. Re is constrained to one another, contaminants will can be effectively cleaned in situ without being pushed out. As the injection tube device at this time, an injection tube as shown in FIGS. 3 to 6 described later can be used.

  That is, according to the volume, permeability coefficient, porosity, etc. of the area of each injection tube, the injection amount, injection speed, or injection pressure of the purification solution is obtained, and the penetration of the purification solution from each injection tube into each region is performed. By synchronizing, the flow of the cleaning liquid can be mutually restrained for each predetermined region that each injection tube takes charge of.

FIG. 13 shows an infusion device in which an infusion line branches from a single infusion pump to a plurality of infusion tubules via a branch bubble for simultaneous infusion or continuous infusion.

  When the present invention is applied as bioremediation, a nutrient solution that activates microorganisms that live in situ can be used as a purification solution, mainly composed of hydrocarbons or proteins.

Although bioremediation is to use the activation of microorganisms for the purification of pollutant, with cleaning solution containing nutrients to activate the microorganisms that live in the cleaning liquid to the original position, which Contaminated Land If the injection is performed simultaneously or selectively from a plurality of injection pipes provided in the container, the purifying action of the pollutant can be exhibited more effectively.

  According to the present invention, in the in-situ purification method such as bioremediation, the injection / penetration of the cleaning solution by multi-point injection is performed within the same time so as to restrain each other between the areas to be handled according to the ground conditions. In this case, the purification liquid is uniformly infiltrated into the target area by performing the synchronization so that the predetermined amount of injection is constrained and completed. It is possible to prevent the deviation from being pushed out of the target range.

  In addition, since there is no location where the penetration of the purification liquid is insufficient, and there is no deviation, the contamination can be left in the target range and the purification material can be applied to reduce or purify the contamination.

It is a graph which shows the relationship between the pressure and injection | pouring speed | rate of a non-solidifying purification liquid, and the setting of a limit injection | pouring speed | rate. (a) is a schematic diagram of the columnar permeation characteristics of the non-consolidating purification solution considering the Darcy law. (b) is a table showing the relationship between the ground particles to be injected and the water permeability. It is the figure which showed notionally the relationship between the injection | pouring area | region of the injection pipe in the in-situ purification method of this invention, the injection amount of cleaning liquid, injection | pouring speed, etc. FIG. I, II, III, IV and V indicate soil layers. (a)-(d) is explanatory drawing which shows an example of the injection pipe used for the in-situ purification method of this invention. (A) shows an injection tubule. (B) shows a binding implantation thin tube. It is a schematic diagram of a multipoint injection device configured to be able to simultaneously inject the cleaning liquid into the ground of a plurality of injection stages at a plurality of points with a bundle injection capillary. An embodiment of an injection tube device capable of columnar penetration used in a multi-point injection device is shown. (A) is a front view when a plurality of injection tubes are bundled and installed, (b), (c ) Is an enlarged cross-sectional view of the main part. In the in-situ purification method of the present invention, it is conceptually shown to synchronize the injection of the purification liquid from the columnar penetration source of each injection pipe having a responsible area, (a) the synchronization of the entire vertical and horizontal direction (B) is a diagram showing vertical synchronization at one point in the horizontal direction, and (c) is a diagram showing that the permeation of the cleaning liquid is restricted between the handling areas. FIG. 8 is a plan view showing the relationship between the carrying area of FIG. By synchronizing and injecting FIGS. 7 (a), 7 (b) and 8 (a), the ground of FIG. 3 is constrained to each other as shown in FIGS. The position can be purified. Is a diagram conceptually showing the state of diffusive transport of contaminants in the conventional method of performing the injection of cleaning liquid Bas Iore mediation Daburupakka method. (a)-(d) is the figure which showed the example of the injection pipe structure which prevented the purification | cleaning liquid from escaping to the ground surface. The example of the separator which mounts | wears with an injection | pouring thin tube is shown, (a) is an elevation view, (b) is a top view. An example of a bundling injection tubule provided with a columnar water guiding member is shown, (a) is an elevation view, (b) is a horizontal sectional view, and (c) is an enlarged view. It is a schematic diagram showing an example of an injection system of the present invention.

  FIGS. 1 to 3 are diagrams conceptually showing the relationship between the receiving area of each injection tube, the injection amount of the cleaning liquid, the injection speed and the like by multi-point injection in the in-situ purification method of the present invention.

In FIG. 3, the target ground for contamination purification is divided into five layers I to V. The water permeability coefficient of each layer is represented by K _i , the porosity is α _i , the carrying volume is V _i , the cleaning liquid injection amount is L _i , and the discharge amount per minute is l _i .

In the present invention, the purification solution injection / penetration by multi-point injection is basically performed by synchronizing so as to be constrained to each other between the areas to be handled according to the ground conditions. According to the volume V _i , the water permeability coefficient K _i , and the porosity α _i , the purifying liquid is uniformly infiltrated into the target range by injecting the purifying liquid injection amount L _i and further determining the discharge amount l _i per minute. It is possible to prevent the occurrence of insufficient penetration.

4 (a) and 4 ( b) show an example of an injection tube inserted into the ground when the in-situ purification method of the present invention is carried out. The injection tube shown in (b) includes a plurality of injection capillaries 2a. fixed length shift the tip end outlet 5 of the injection capillary 2a in axial direction of the tube, and that is configured by bundling a human bundle.

By being configured as this, in each injection capillary 2a of the front end discharge opening 5 different stages of depth from the (formation), cleaning liquid simultaneously or simultaneous injection of a plurality of stages selected arbitrarily, can do.

  An example of a VOC (volatile organic compound) purification method according to the present invention will be described below.

  The pollutants to be purified are tetrachloroethylene and trichlorethylene, and are purified by the multi-point injection method.

  The purification solution is an organic substance mainly composed of carbohydrates and proteins, which is biodegradable and metabolized by microorganisms that are nutrient sources for microorganisms, preferably sugars that are metabolized and decomposed by microorganisms in the soil. Use.

  Specific examples include monosaccharides such as glucose and fructose, disaccharides such as sucrose, maltose and galactose, other oligosaccharides, polysaccharides such as starch and maltodextrin, and other saccharides.

The purification principle is as follows.
(1) The aerobic microorganisms that originally live in the ground are activated by the purification solution that has penetrated the ground.
(2) Aerobic microorganisms consume underground oxygen and form an anaerobic atmosphere (a state with little oxygen).

(3) Anaerobic microorganisms are activated by the cleaning solution. Organic substances in the cleaning liquid are decomposed by anaerobic microorganisms, and hydrogen (H) is generated.
(4) Anaerobic microorganisms decompose the VOC chlorine (Cl) by replacing it with hydrogen (H).

(5) When the VOC is eliminated, anaerobic microorganisms is reduced after consumption of cleaning liquid, Ru return to its original environment.

The present invention on the Symbol purification principles in order to situ remediation in heterogeneous Contaminated Land shall use the following technique.

  5 and 6 show a multi-point injection apparatus configured to be able to simultaneously inject a non-curable cleaning liquid containing a biodegradable organic substance into a plurality of injection stages A, B, C, and D at a plurality of injection points. This shows the purification method.

  The multi-point injection apparatus using the columnar osmotic injection tubule can easily perform the above-described synchronization injection. In the figure, reference numeral 5 denotes a discharge port, and a check valve 5a such as a rubber sleeve covering the discharge port 5 is a columnar water guiding member made of a film, a mat, a net-like body, or a belt-like body having a slit covering it. The purification liquid is discharged from the entire columnar permeation source 7 from the discharge port 5 through the check valve 5 a and the columnar space water guiding member 6. For this reason, it is injected at a low pressure from a large permeation source (FIG. 2).

  In the figure, the injection pipe 2 of the injection pipe device shown in FIG. 6 is built in each drilling hole 1 formed at each of a plurality of injection points, the tip of each injection pipe 2 is closed, and the side of the tip is One or a plurality of purification liquid discharge ports 5 are formed, and a check valve 5a and a columnar space water guide member 6 are respectively attached.

  Furthermore, the tip of each injection tube 2 configured in this way is arranged so as to be positioned at a predetermined interval in the depth direction of the drilling hole 1. A seal grout 4 is filled in a gap 3 between the hole wall of the hole 1 and each injection tube 2 over a predetermined length. With such a configuration, a plurality of columnar permeation sources 7 having continuous sections L in the tube axis direction are formed in the gap 3 between the drilling hole 1 and the injection tube 2 at predetermined intervals in the tube axis direction.

  By using such a columnar osmotic injection method, a single-stage injection source can be made long, so even if the injection rate per stage is increased, injection can be performed at a low pressure, so that movement of contaminants can be prevented and binding can be performed. Since the diameter of the injection tube is reduced, an effect that the diameter of the drilling hole can be reduced is produced.

  Further, as shown in FIG. 5, a plurality of unit pumps 12 for injecting the purification liquid into the ground through the injection pipe 2, and the flow rate and / or pressure of the purification liquid to be sent at each injection point A flow rate / pressure measuring device 13 for measuring, a monitoring panel for displaying each injection point in liquid crystal form, and a centralized management device 17 for controlling the unit pump 12, the flow rate / pressure measuring device 13 and the monitoring panel. The unit pump 12 is operated using the provided multi-point injection device, and the monitoring panel is used to collectively monitor the injection point, the supply state of the purification liquid at each injection point, and the supply state of the purification liquid to each injection point While the unit pump 12 and the flow rate / pressure measuring device 13 are controlled by the centralized management device 17, the flow of the cleaning liquid can be made by simultaneously or selectively injecting into a plurality of injection points. And flux, the permeate insufficient portion of the cleaning liquid is prevented from occurring, to purify the pollutants in the predetermined region.

  That is, a purification liquid storage tank 10 in which a purification liquid is stored is connected to each injection pipe 2 via a conduit 11, and the injection material is pumped to each injection pipe 2 from the injection material storage tank 10 to each injection pipe 2. Are connected to a unit pump 12, a flow rate / pressure detection device 13 for detecting the flow rate and pressure of the cleaning liquid at each injection point, and a valve 14 for starting and blocking the pumping of the cleaning liquid.

  Each unit pump 12 includes a rotational speed transmission 15 such as an inverter, and is configured to be individually operated by an independent drive source 16 such as a motor. Further, each unit pump 12, the rotational speed transmission 15, the flow rate pressure detector 13 and the valve 14 are respectively connected to a centralized management device 17, and all are individually controlled by the centralized management device 17.

  In such a configuration, when a flow rate and / or pressure data signal from the flow rate / pressure detection device 13 is transmitted to the central control device 17, the unit pump 12 is operated from the storage tank 10 to each injection pipe 2 respectively. The cleaning liquid is pumped at an arbitrary injection speed, injection pressure, and injection amount.

  At a plurality of injection points, the purification liquid is simultaneously or selectively discharged from the purification liquid discharge port 2a of each injection pipe 2 to the columnar penetration source 7 and further penetrates simultaneously from the columnar penetration source 7 into the surrounding ground. By being injected, it is possible to simultaneously inject the cleaning liquid into the ground of the plurality of injection stages A, B, C, D at a plurality of injection points.

  In the in-situ purification method of the present invention, FIG. 7 and FIG. 8 are conceptual diagrams of the improvement rate and the improved shape when the purification liquid is synchronized and the penetration of the purification liquid to the outside of the handling area is restricted. Synchronizing means that the injection of the receiving volume of adjacent injection capillaries is completed within the same time, and the purifying solution is infiltrated so as to constrain its boundary surface or injection range.

  By simultaneously injecting the purification solution from a plurality of injection pipes simultaneously, the purification solution can be contained in a predetermined range at a maximum discharge speed for each soil layer and at a low pressure that does not cause soil particles to move or crack. By purifying, the purifying liquid can be uniformly distributed from the injection pipe without extruding the purifying liquid injected at other depths or without extruding the contaminants and diffusing to the outside.

  In performing the multi-point injection method, it is desirable to perform the injection periods at adjacent depths without a time difference. The occurrence of a time difference means a state in which one injection is completed in advance and the other adjacent is continuing the injection. At that time, the purification liquid on the side that has been finished in advance is pushed out together with the contaminants from the other side by the injection pressure.

  In order to infiltrate the purification solution into the target range and prevent the occurrence of insufficient penetration, it is desirable to align the injection time at each depth in the multi-point injection method.

  In the apparatus of FIG. 5 described above, the injection pipe apparatus has a plurality of cleaning liquid discharge ports 5 and a check valve 5a covering the discharge ports 5 in the tube axis direction as shown in FIG. And a column-shaped space water guide member 6 attached to cover an outer peripheral portion of the injection tube 2 including a portion having the purification liquid discharge port 5 and the check valve 5a in a tube axis direction. The columnar seepage source 7 and a seal grout 4 filled in the gap between the hole wall of the drilling hole 1 and the injection pipe 2 and the columnar space water guide member 6, the columnar space water guide members 6 are arranged on both the upper and lower sides in the tube axis direction. The side wall part and the hole wall side part are covered with a seal grout 4 to form an independent column penetration source 7, and the seal grout 4 is injected into the ground via the injection pipe 2, the discharge port 5 and the check valve 5a. It is strong enough to be crushed by the discharge pressure of the cleaning liquid, and the columnar immersion By breaking the seal grout 4 from the source 7 and injecting it into a predetermined injection stage, even a large discharge amount is injected into the ground at a low pressure, and the cleaning liquid from other injection stages or from other injection pipes is injected into the injection pipe. It is configured to be injected into the ground for each independent injection stage without backflowing into the ground.

  In the present invention, the plurality of purification liquids discharged simultaneously from the plurality of discharge ports 5 are unlikely to be mixed because the flowing liquid layers repel each other due to the osmotic pressure, and therefore the injection liquid is layered horizontally in the ground. Focused on the penetration.

  Since the phenomenon that the purification liquid penetrates in the horizontal direction without substantially escaping to the ground surface occurs, it becomes possible to purify the contaminated ground at once in both the vertical and horizontal directions.

  Accordingly, in the present invention, low-pressure injection that allows the maximum discharge speed for each soil layer and permeation between the soil grain holes can be performed from one discharge port, and the osmotic pressures of the adjacent cleaning liquids repel each other to cause layered permeation. Therefore, it is possible to continue permeation for a long time without clogging at a low pressure and with a large discharge amount.

  Thus, in the present invention, if the plurality of stages permeate at the same time, the flow in the upper layer and the lower layer of the cleaning liquid is constrained by each other's osmotic pressure. Found to penetrate. The injection solution is injected by selecting an injection speed and an injection amount according to the state of the soil layer of each stage.

By bundling a plurality of thin tubes so that the discharge ports are positioned at intervals in the axial direction, optimum injection can be simultaneously achieved for each of these layers even on the ground having a different ground condition. Moreover, the vertical direction in the ground, three-dimensional co-injection into lateral Ru possible der.

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

  Conventionally, in the case of injecting a caustic grout from a bundling injection capillary 2A formed by bundling injection tubules 2a, if the bundling injection tubule 2A is installed in a seal grout 4 in a drilling hole, the injection tubules 2a of the bundling injection tubule 2A are connected to each other. Even if there was a space, there was no problem because the caking grout and the seal grout 4 in the drilling hole reacted to consolidate and close the space.

  However, since the purification liquid is non-solidifying as described above, when the bundling injection thin tube 2A is used, even if the bundling injection thin tube 2A is installed in the seal grout 4, the gap between the injection thin tubes 2a is not sufficiently filled. Therefore, it is difficult for the cleaning liquid to flow out to the ground from the gap between the injection thin tubes 2a and be injected into a predetermined region. For this purpose, the following method is used.

(1) A method in which the gap between the injection capillaries 2a in the bundle injection capillaries 2A as well as in the drilling holes is filled with the seal grout 4. For this purpose, a seal grout injection tube 21 is provided in the bundle injection capillary 2A to seal the gap (injection tube 21 for seal grout in FIG. 10 ). The seal grout injection tube 21 may be removed together with the seal grout injection.
(2) A method in which the separator 30 is provided in the bundle injection capillary 2A and installed in the seal grout 4 in the drilled ground (see FIG. 11 ).

(3) A method of injecting the grouting into the seal grout 4 by providing the bundling injection thin tube 2A in at least the gap injection region 2A located above the contaminated region or the contamination region (see FIG. 10 (d)). .
(4) A method in which a bag body 23 is provided at least above the contaminated region of the binding injection capillary 2A, and a solidified material is injected into the bag body 23 to block the gap between the binding injection capillary 2A ( FIG. 10 (a)). , (B), (c)).

(5) A method in which a plurality of bag bodies 23 are provided in the above (4), and grout is injected from an injection port provided between the bag bodies 23 (see FIGS. 10A and 10B).
(6) A method of wrapping the bundle injection tube 2A with the bag body 9 and opening the injection / discharge port outside the bag body 9 (see FIG. 12 ).

FIG. 13 shows the injection system of the present invention.

FIG. 13 shows a system in which the cleaning solution is injected simultaneously or continuously from a single injection pump into a plurality of injection capillaries (bundling injection capillaries) via branch bubbles. The controller controls the injection pressure, injection speed, and injection volume, and operates the bubble and injection pump. It infusion tube 2 may be respectively injected tubules, but it may also be bundled in four injection capillary 2.

Injection of purification of liquid, and Daburupakka method is (A) prior art, performed by each of the multi-point injection method is the invention means (B), to evaluate the permeation of cleaning liquid. The amount of the purification solution with a total organic carbon concentration of 100 mg / L or more was designed and injected into the soil having a radius of 1 m from the injection point.

  Table 1 shows the distribution of the cleaning solution at the specified distance from the injection point in each method according to the total organic carbon concentration.

  According to Table 1, in the conventional technique (double packer method), a width of 485 to 45 mg / L is seen in the total organic carbon at each depth at a position of 0.5 m from the injection well. At a position 1.0 m from the injection tube, it was 93 to 20 mg / L, and the total width was 485 to 20 mg / L.

  On the other hand, in the method of the present invention (multi-point injection method in which FIG. 3 is arranged as shown in FIG. 5), a width of 291 to 234 mg / L is seen in the total organic carbon at every depth of 0.5 m from the injection well. . At a position of 1.0 m from the injection well, it was 228 to 108 mg / L, and the width was 291 to 108 mg / L as a whole.

  Compared to the prior art, the inventive method suppresses variations with respect to the designed total organic carbon concentration of 100 mg / L. That is, it can be seen that there is no portion where the purification liquid is not sufficiently penetrated.

DESCRIPTION OF SYMBOLS 1 ... Drilling hole, 2 ... Injection pipe, 2A ... Bundling injection thin tube, 2a ... Injection thin tube, 3 ... Gap, 4 ... Seal grout, 5 ... Discharge port, 5a ... Check valve, 6 ... Columnar space water conveyance member, 7 ... Columnar penetration source,
DESCRIPTION OF SYMBOLS 10 ... Purified liquid storage tank, 11 ... Conduit, 12 ... Unit pump, 13 ... Flow volume / pressure detection apparatus, 14 ... Check valve, 15 ... Rotational speed transmission, 16 ... Drive source, 17 ... Central control apparatus, 18 ... Injection inner tube lifting device, 19 ... injection stage management device,
21 ... Seal grout injection tube, 21a ... Discharge port, 22 ... Injection capillary fixing plate, 23 ... Bag packer, 24 ... Grout injection tube, 24a ... Discharge port,
30 ... Separator, 31 ... Injection capillary fitting hole, 32 ... Seal grout injection tube

The present invention purifies contaminated ground by injecting a nutrient solution (non-solidifying purification solution) into a plurality of injection points of the contaminated ground through a plurality of injection pipes provided in the ground. In-situ purification method by injection , a plurality of injection pipes having a discharge port at the tip for injecting a non-solidifying purification liquid containing biodegradable organic matter into the ground at a plurality of injection points, and the injection pipe and one injection pump through the multiple infusion pumps or branched valve for injecting the purifying liquid into the ground via the flow rate and pressure of the cleaning liquid is fed into the injection tube measurement Using a multi-point injection device equipped with a flow rate and pressure measuring device to divide the target soil for pollution purification into soil layers, and locate the discharge port of each injection pipe for each soil layer, injection volume and injection speed of the volume, depending on the permeability and porosity, the cleaning liquid Set to control the flow and pressure of the infusion pump in accordance with the liquid feed condition of cleaning liquid to the injection conditions and the injection point of the cleaning liquid in the injection tube, immersion of cleaning liquid from the discharge ports of the injection tube By synchronizing so that the injection of a predetermined amount is constrained and completed within the same time so as to constrain each of the permeation areas adjacent to each other, a portion where the penetration of the cleaning liquid is insufficient is generated. In addition, the purification liquid is purified by the action of the purification liquid while preventing the purification liquid from deviating from the contamination target area and the accompanying deviation from the original position of the contamination. .

FIG. 5 is a specific example of the present invention. FIG. 5 shows a plurality of injection pipes for injecting a purification liquid containing biodegradable organic substances into the ground at a plurality of injection points, and a plurality of unit pumps for injecting the purification liquid into the ground through the injection pipes. and (infusion pump), and the flow rate and pressure measuring device for measuring the flow rate and pressure of the cleaning liquid is fed into each inlet tube and monitoring panel for displaying each injection point, the unit pump Using a multi-point injection device equipped with a centralized control device for controlling the flow rate / pressure measurement device and the monitoring panel, the unit pump is operated, the injection pipe in the monitoring panel, the injection status of the cleaning liquid at each injection point, and each Each of the injection pipes can be simultaneously or selectively injected into a plurality of injection points while collectively monitoring the supply state of the cleaning liquid to the injection points and controlling the unit pump and the flow rate / pressure measuring device with a central control device. Or While preventing the flow of the purification liquid from occurring in a predetermined area that each injection tube takes into account, the location of the penetration of the purification liquid is prevented, and the contaminants are purified by the action of the purification liquid. Is.

That is, the volume of the charge region of the injection tube, depending on the permeability and porosity determines the injection amount and injection speed or injection pressure of the cleaning liquid, the penetration into the area of the cleaning liquid from the injection tube By synchronizing, the flow of the cleaning liquid can be mutually restrained for each predetermined region that each injection tube takes charge of.

FIG. 13 shows an infusion device in which an infusion line branches from a single infusion pump to a plurality of infusion tubules via a branch valve for simultaneous infusion or continuous infusion.

In the present invention, the purification solution injection / penetration by multi-point injection is basically performed by synchronizing so as to be constrained to each other between the areas to be handled according to the ground conditions. According to the volume Vi, the water permeability coefficient Ki, and the porosity αi, the purifying liquid is uniformly infiltrated for every target range by obtaining the injecting amount Li of the purifying liquid and further the discharge amount li per minute. It is possible to prevent the occurrence of sufficient locations.

Further, as shown in FIG. 5, a plurality of unit pumps 12 for injecting the purifying fluid into the ground through the injection tube 2, the flow rate and pressure of the cleaning liquid is fed into the injection tube A flow rate / pressure measurement device 13 for measuring the pressure, a monitoring panel for displaying each injection point in liquid crystal, and a centralized management device 17 for controlling the unit pump 12, the flow rate / pressure measurement device 13 and the monitoring panel. The unit pump 12 is operated by using a multi-point injection device equipped with an injection pipe , and the state of injection of the cleaning liquid at each injection point in the monitoring panel, and further the state of the supply of the cleaning liquid to each injection point While monitoring and controlling the unit pump 12 and the flow rate / pressure measuring device 13 by the centralized management device 17, the flow of the cleaning solution is constrained by simultaneously or selectively injecting into the plurality of injection points, Together to prevent insufficient portion occurs, to purify contaminants in a predetermined region.

FIG. 13 shows a system in which the cleaning solution is injected simultaneously or continuously from a single injection pump into a plurality of injection capillaries (bundling injection capillaries) via branch valves . The controller controls the injection pressure, the injection speed, and the injection amount, and operates the valve and the injection pump. Each of the injection tubes 2 may be an injection capillary tube, or four injection capillary tubes 2 may be bundled.

Claims (15)

  An in-situ purification method that purifies contaminated ground by injecting non-solidifying purification liquid from an injection pipe provided in the ground, and a plurality of injections in which purification liquid containing biodegradable organic matter is provided in the contaminated ground By simultaneously injecting from the pipe, it is possible to prevent the purification liquid from deviating from the contamination target area and the accompanying contamination, and purify the contaminant by the action of the purification liquid. Position purification method.   An in-situ purification method that purifies contaminated ground by injecting a non-solidifying purification solution from an injection tube provided in the ground, and is a bundling injection capillary tube that is formed by bundling a plurality of injection capillaries as injection tubes. A plurality of the contaminated ground is provided, and the purifying liquid containing biodegradable organic matter is infused and injected at a pressure within a limit that simultaneously infiltrates between soil particles at an injection speed of 1 to 6 liters per minute per one injection capillary, The flow of the cleaning liquid from each injection capillary tube is mutually restrained for each predetermined area that each injection capillary tube is responsible for, so as to prevent the cleaning liquid from deviating from the contamination target area and the accompanying contaminants from deviating. In-situ purification method by multi-point injection, characterized by purifying pollutants by action. 3. The in-situ purification method by multi-point injection according to claim 2, wherein the non-solidifying purification liquid is prevented from leaking to the ground surface through the gap between the bundle injection capillaries by any one or more of the following means. An in-situ purification method characterized by purifying pollutants.
(1) Means for filling a seal grout between the drilling hole and the bundle injection capillary.
(2) Means for bundling a plurality of injection capillaries via a separator and filling a seal grout material by closing the gap between the injection capillaries with the separator.
(3) Means for providing a bundling injection capillary in the seal material and injecting grout into the gap between the binding injection capillary located at least above the contaminated area.
(4) Means for providing a bag body at least above the contaminated region of the bundling injection tubule and injecting a solidified material into the bag body to block the gap between the bundling injection tubules.
(5) Means for providing a plurality of bags in (4) and injecting grout from the inlet provided between the bags.
(6) Means for wrapping a bundle injection capillary tube in a bag and opening an injection / discharge port outside the bag.   In a multi-point ground injection method that injects purification liquid into multiple injection points of contaminated ground through multiple injection pipes, multiple injections for injecting purification liquid containing biodegradable organic matter into the ground at multiple injection points Injection pipe, a plurality of unit pumps for injecting the purification liquid into the ground via the injection pipe, and a flow rate for measuring the flow rate and / or pressure of the purification solution sent at each injection point A pressure measuring device, a monitoring panel for displaying each injection point, and a multipoint injection device comprising a centralized control device for controlling the unit pump, the flow rate / pressure measuring device and the monitoring panel, and the unit The pump is operated, and the monitoring point is used to collectively monitor the injection point, the supply state of the purification liquid at each injection point, and the supply state of the purification liquid to each injection point, and the unit pump and flow rate / pressure measurement. The control solution is controlled by the centralized control device and simultaneously injected into a plurality of injection points, so that the flow of the cleaning solution from each of the injection tubes is mutually restricted for each predetermined region that each injection tube takes charge of. In-situ purification by multi-point injection, characterized in that it prevents the occurrence of inadequate penetration of pollutants and prevents the contaminants from deviating from the original position and purifies the contaminants by the action of the cleaning liquid Construction method.   In the in-situ purification method by multi-point injection according to any one of claims 1 to 4, the injection amount and the injection speed of the cleaning liquid according to the volume, the water permeability coefficient, and the porosity of the handling area of each injection pipe Multipoint injection characterized in that the flow of the purification liquid is mutually constrained for each predetermined area of each injection pipe by synchronizing the penetration of the purification liquid from each injection pipe into each area In-situ purification method.   The in-situ purification method by multi-point injection according to any one of claims 1 to 5, wherein the purifying liquid is a nutrient solution that activates microorganisms that live in situ with a hydrocarbon or protein as a main material. In-situ purification method by multi-point injection characterized by being.   The in-situ purification method by multi-point injection according to any one of claims 1 to 6, wherein the purification liquid contains microbubbles.   The in-situ purification method by multi-point injection according to any one of claims 1 to 7, wherein the injection pipe device used for the multi-point injection includes a plurality of purification liquid discharge ports and the discharge ports in the tube axis direction. A check valve that covers the pipe, and covers a certain range in the axial direction of the pipe including the injection pipe installed in the drilling hole and the outer peripheral portion of the injection pipe having the purification liquid discharge port and the check valve A columnar permeation source comprising a columnar space water conveyance member attached to the hole, and a seal grout filled in a gap between the hole wall of the drilling hole and the injection pipe and the columnar space water conveyance member, and the columnar space water conveyance member The upper and lower sides and the side of the hole wall in the tube axis direction are covered with the seal grout to form an independent column penetration source, and the seal grout is formed in the ground via the injection pipe, the discharge port and the check valve. Crushed by the discharge pressure of the cleaning liquid injected into the The cleaning liquid is injected into a predetermined injection stage by breaking the seal grout from the columnar permeation source via the injection pipe, the discharge port, and a check valve. However, it is injected into the ground at a low pressure and contaminated by being injected into the ground simultaneously from multiple discharge outlets without purifying liquid from other injection stages or from other injection pipes into the injection pipe. In-situ purification method by multi-point injection, which is characterized by purifying.   It is an injection pipe apparatus used for the in-situ purification method by the multipoint injection as described in any one of Claims 1-8, Comprising: A non-return valve which covers a several purification liquid discharge port and the said discharge port in a pipe-axis direction is provided. And a columnar space that is attached so as to cover a certain range in the axial direction of the pipe including an injection pipe installed in the drilling hole and a portion having the purifying liquid discharge port and a check valve on the outer periphery of the injection pipe A columnar seepage source comprising a water guide member, and a seal grout filled in a gap between the hole wall of the drilling hole and the injection pipe and the columnar space water guide member. A side wall and a hole wall side are covered with the seal grout to form an independent column penetration source, and the seal grout is injected into the ground through the injection pipe, discharge port and check valve Strength that can be crushed by the discharge pressure of The cleaning liquid is injected into a predetermined injection stage from the column penetration source through the injection pipe, discharge port and check valve, and is injected into a predetermined injection stage. Injected and configured so that the cleaning liquid from other injection stages or from other injection pipes can be simultaneously injected into the ground from a plurality of cleaning liquid discharge ports without flowing back into the injection pipe. An injection tube device characterized by.   In-situ purification method that purifies contaminated ground by injecting purification liquid from the injection tube provided in the ground, and contains microbubbles and nutrients that activate microorganisms that live in situ as the purification liquid An in-situ purification method using multi-point injection, wherein a purifying liquid is injected simultaneously or selectively from a plurality of injection pipes provided on a contaminated ground, and the pollutant is purified by the action of the purifying liquid.   It is a purification liquid used for the in-situ purification method which purifies the soil which is inject | poured from the injection pipe provided in the ground in Claim 10, and is contaminated, Comprising: The nutrient which activates the microbubble and the microorganisms which live in the in-situ A cleaning liquid for in-situ purification method, comprising:   An in-situ purification method using a vortex generator as a bubble generator for injecting cleaning liquid mixed with microbubbles, and when the impeller of the bubble generator is rotated at high speed by power, from the cleaning liquid tank The cleaning liquid is sucked and air is sucked from the air pipe. After the cleaning liquid and air are agitated, mixed, and dissolved by the impeller rotating at high speed in the device, it is injected from the injection pipe into the ground. In-situ purification method.   An in-situ purification method using a vortex generator as a bubble generator for injecting cleaning liquid mixed with microbubbles, and when the impeller of the bubble generator is rotated at high speed by power, from the cleaning liquid tank The cleaning liquid is sucked and air is sucked from the air pipe. Further, the air mixed cleaning liquid is circulated through the cleaning liquid tank and the bubble generating device, and the air is stirred, mixed and dissolved in the cleaning liquid, and then the injection pump is turned on. In-situ purification method, which is injected into the ground through   An injection apparatus comprising a purification liquid tank, an injection pump, a plurality of injection capillaries, and a conduit communicating these, the plurality of injection capillaries branch from the conduit via a branch bubble, from the injection pump to the injection capillaries The multipoint injection according to any one of claims 1 to 8, comprising a pressure gauge and a flow meter provided in any of the above, and a controller that manages measurement management of the pressure gauge and the flow meter and operation of the branch bubble. Injection device used for in-situ purification method.   An in-situ purification method, wherein in-situ purification is performed by injecting a purifying solution into a contaminated ground from one infusion pump into a plurality of infusion tubules via branch bubbles using the infusion device according to claim 14.

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