KR100829023B1 - High-pressure liquid injection method for in-situ remediation of contaminated soil, and the apparatus of that - Google Patents

Abstract

A high-pressure liquid injection method for in-situ remediation of contaminated soil and a high-pressure liquid injection apparatus therefor are provided to expand the injection range of the microorganism liquid and prevent secondary contamination by sequentially injecting high pressure air and activity-maintained microorganism liquid into the contaminated soil, and efficiently remediate the contaminated soil even when a remediating operation space is narrow. A high-pressure liquid injection method for in-situ remediation of contaminated soil comprises: a step(100) of installing a microorganism liquid tank at one side of contaminated soil; a step(200) of connecting a transfer car type microorganism liquid injector to the microorganism liquid tank by a pipe; a step(300) of digging a plurality of injection holes into the contaminated soil; a step(400) of inserting injection wells into the injection holes, and injecting high pressure air into the injection wells, the injection wells being connected to a transfer car type high pressure air injector and the microorganism liquid injector by pipes; and a step(500) of injecting a microorganism liquid into the injection wells.

Description

High-pressure liquid injection method for in-situ remediation of contaminated soil, and the apparatus of that}

1 is a process block diagram of the method of the present invention.

Figure 2 is an embodiment configuration of the device of the present invention.

Figure 3 is a structural diagram of one embodiment injection tablet constituting the device of the present invention.

           ((Explanation of symbols for main part of drawing))

         21. Microbial fluid tank 22. High pressure air injector

         22A, 23A. Balance 22B. Air compressor

         23. Microbial fluid injector 23B. Liquid injection pump

         24. Injection well 24A. Body

         24B.H Connection hole

         h. Through S. Polluted Soil

The present invention, in order to restore the contaminated soil by injecting compressed air into the contaminated soil to increase the cracks of the soil to increase the air permeability of the contaminated soil ground, by injecting microbial fluid at high pressure to efficiently clean the contaminated soil The present invention relates to a method and apparatus for underground high pressure liquid phase injection for contaminating soil.
For reference, the present invention is the achievement of the next-generation core environmental technology development project supported by the Ministry of Environment, the unique number of the research and development project is 041-061-039, and the title of the research and development project is "Low temperature heat treatment and biological purification of oil-contaminated soil-ground water". Development of LTTD system combined with bioremediation to treat oil-contaminated soil and groundwater.

Environmental pollution caused by the development of the industry can be classified into air pollution, water pollution and soil pollution. Among them, soil pollution is a very serious threat to food production and causes water pollution through groundwater pollution. In addition, there is a problem that is not easy to solve compared to air pollution or water pollution.

Therefore, various methods have been researched and developed to restore the contaminated soils. The restoration methods of the contaminated soils can be broadly classified into underground treatment methods performed underground and ground treatment methods performed above the ground. Polluted soil by circulating the wash water in the contaminated soil to be installed after installing the washing solution injection well, washing solution discharge well, washing effluent treatment facility, pump and instrumentation facility, and volatile material treatment facility without digging the soil. As a method of directly washing, there is a disadvantage in that the treatment time is long and the recovery of the washing liquid is difficult.

In addition, the ground treatment method is a method of cleaning the contaminated soil excavated with an appropriate cleaning solution or chemicals after excavating contaminated soil in the range to be treated by grasping the distribution of contaminants in the soil and physical / chemical characteristics of the soil. However, the application is very limited in the case of the majority of pollution sites with various facilities on contaminated soil sites.

Therefore, the ground treatment method is applied to the restoration of the most contaminated soils, which is classified into biological methods and chemical methods. Bioventing is a technique for decomposing and extracting a desired object through the well by inserting a well into the ground. ) Or Phytoremediation is a method using microorganisms, and chemical oxidation, soil vapor extraction (SVE), air sparging, bioslurping, etc. are chemical or physical treatments. This can be called.

In the underground treatment method as described above, it is common to excavate a well in a contaminated soil, insert a tubular injection well into the well, and inject chemicals, oxidants, microorganisms, etc. into the contaminated soil so that the contaminants are decomposed. to be.

The underground treatment method is a technique of injecting air, medicine, microorganisms into the ground to purify the contaminated soil or groundwater. Initially, gaseous or liquid substances were flowed through the wells to the contaminated location, but in recent years high pressure injection wells It was developed in the manner of using the Korean Utility Model Registration No. 308522, "High Pressure Injection Well for Restoring Polluted Soil and Groundwater", and Korean Utility Model Registration No. 308522, "In-vehicle oxidant for restoring contaminated soil and groundwater. Injection devices "are each published.

However, the conventional purification method using a conventional injection well, such as the injection well or purchase device of the utility model registration, there is a problem of secondary contamination by chemicals because the injection of a liquid chemical, such as an oxidizing agent.

In addition, even when using a high-pressure injection well, the injection range is limited, and in particular, in the case of a low permeability coefficient and condensed soil, the injection range of the injection is further reduced, so that the number of wells is required, thereby increasing the processing cost and The time is increased excessively.

In addition, when there are ground facilities in the contaminated soil, the space for performing the purification operation is inevitably narrow, so that the conventional general underground treatment method using the injection well is difficult to carry out.

The present invention has been devised to solve all the problems of the conventional soil cleaning method using chemical injection wells, and only a sufficient amount of high-pressure air is first sprayed to form a sufficient crack in the soil soil. By injecting the microbial fluid maintained active through the dedicated device in the present invention, to provide a high pressure liquid injection method and apparatus for the purification of contaminated soil, while expanding the injection range of the microbial fluid and without the problem of secondary pollution There is a purpose.

In addition, there is another object of the present invention to provide a method and apparatus capable of efficiently purifying contaminated soil when the purification work space is narrow because there is a ground facility.

The above object of the present invention is achieved by a high-pressure air injector for forming cracks in the soil of contaminated soil, and a bogie-type microbial fluid injector which is freely movable.

The underground high pressure liquid phase injection method and apparatus for purifying contaminated soil of the present invention are for effectively injecting the microbial fluid into the contaminated soil.

Digging a plurality of injection holes in the contaminated soil; Injecting high pressure air into each excavation hole; It consists of the step of injecting microbial fluid into each excavation hole, there is a technical feature of the present invention to inject high-pressure air before injecting the microbial fluid.

That is, by injecting enough high-pressure air into the contaminated soil ground through the excavation hole before injecting the microbial liquid, a large number of cracks are generated in the contaminated soil ground, so that the diffusion range of the microbial liquid injected afterwards can be maximized. do.

As described above, the method of the present invention is an underground treatment method, in particular, when it is difficult to dismantle the ground facilities in the contaminated soil, or to clean it while operating a plant, that is, when the excavation of contaminated soil is practically impossible. A microbial fluid tank temporarily fixed to a contaminated soil boundary; A mobile high pressure air injector for injecting high pressure air into the contaminated soil; A mobile microbial fluid injector for receiving the microbial fluid from the microbial fluid tank and injecting the microbial fluid into the contaminated soil; Consists of injection wells inserted into injection holes excavated in contaminated soil, looking at each as follows.

The microbial fluid tank is a tank for storing a microbe-containing liquid. The microbial fluid tank is temporarily fixed to one side of the ground of the contaminated soil to be purified, and the tank is insulated so that the activity of the microorganism can be maintained in an optimized state. A heater is provided.

In addition, an acid tank, an alkali tank, and a nutrient tank for supplying acid and an alkali for controlling acidity of the microbial fluid may be additionally connected while supplying a nutrient required for activation of the microorganism.

The high pressure air injector is for generating a crack in the soil soil, and the trolley can move freely; It consists of an air compressor seated on a truck.

The microbial fluid injector is for injecting the microbial fluid from the microbial tank and then injecting it into the contaminated soil. It consists of a liquid injection pump seated on the truck.

The injection well is a tube of an upward opening type that serves as a nozzle for injecting the high pressure air and the microbial fluid, and the high pressure air injector and the microbial fluid injector are piped together at an upper end thereof, and a plurality of through holes are formed in the outer circumferential surface thereof. .

The apparatus of the present invention as described above, the high-pressure air injector and the microbial fluid injector is a free-to-move bogie type, the microbial fluid is placed where necessary while moving the injection well inserted into the injection hole together with the high-pressure air injector and the microbial fluid injector. Injectable.

Details of the effects and the resulting effects, including the object and technical configuration of the present invention will be clearly understood by the following description with reference to the drawings showing a preferred embodiment of the present invention.

The process block diagram of the method of this invention is shown in FIG. 1, and the block diagram of the apparatus of this invention is shown in FIG.

As shown, the underground high pressure liquid injection method for the purification of contaminated soil of the present invention,

Installing a microbial fluid tank on one side of the contaminated soil;

Connecting a pipe-type microbial fluid injector to the microbial fluid tank (200);

Excavating a plurality of injection holes in the contaminated soil (300);

Inserting an injection well connected to the bogie-type high pressure air injector and the microbial fluid injector into each excavation hole and then injecting high pressure air (400);

It consists of sequential processes such as the step of injecting the microbial fluid (500).

Apparatus for implementing the method of the present invention as described above,

A microbial fluid tank 21 temporarily fixed to one side of the contaminated soil S;

A high-pressure air injector 22 for injecting high-pressure air into the contaminated soil S, comprising a trolley 22A free to move and an air compressor 22B seated on the trolley 22A;

It is for injecting microbial fluid into the contaminated soil (S), consisting of a bogie 23A free to move, and a liquid injection pump 23B seated on the bogie 23A and piped to the microbial fluid tank 21. A microbial fluid injector 23;

 Inserted into the injection hole (H) excavated in the contaminated soil (S), the upper end is composed of an injection well 24 and the like connected to the high-pressure air injector 22 and the microbial fluid injector 23, respectively.

At this time, the injection well 24 is connected to the high-pressure air injector 22 and the microbial fluid injector 23, respectively, as shown in FIG. 3, the upper open tubular body 24A having the lower end blocked. And a connecting portion 24B coupled to the open upper end of the body 24A, and branching the connecting portion 24B in two directions to connect the high-pressure air injector 22 and the microbial fluid injector 23 to each other. do.

In addition, a plurality of through holes h are formed in the outer circumferential surface of the injection tablet body 24A in the up and down direction, and the through holes h may be formed in a circular or left and right direction, but may be formed up and down. Straight through holes h are preferred in terms of efficiency.

In addition, in order to preserve microorganisms and maintain activity, the microbial fluid tank 21 is additionally installed with a nutrient tank, an acid tank and an alkali tank for pH adjustment, and a microbial fluid tank for maintaining the temperature of the microbial fluid. It is good to insulate the heater and combine the heater at the same time.

In addition, when the area of the contaminated soil to be purified is large, the microbial fluid supplied from the microbial fluid tank 21 to the microbial fluid injector 23 while the pipe between the microbial fluid tank 21 and the microbial fluid injector 23 becomes too long. Since the activity of the bar may be reduced, it is also preferable to provide a microbial fluid transfer means in which a small-capacity microbial fluid simple tank (not shown) is seated on a trolley (not shown).

That is, the microbial fluid transfer means may be connected to the microbial fluid injector 23 adjacent to the pipe, and the microbial fluid transfer means may be connected to the microbial fluid tank 21 and then temporarily stored in the simple tank of the microbial fluid transfer means. .

At this time, the simple tank is also insulated for maintaining the activity of the microbial fluid at the same time coupled to the heater, it is also preferable to additionally combine a small capacity acid tank, alkali tank, nutrient tank and the like to the tank for transporting the simple tank.

As described above, the method and apparatus for underground high pressure liquid phase injection for contaminating soil soil according to the present invention, since the soil soil is cracked by a high pressure air injector, the injection diffusion range of the microbial fluid is expanded, and the purification efficiency is improved. The microbial fluid storage tank and the microbial fluid injector are separated at the same time, so the microbial fluid injector and the high-pressure air injector can be freely moved.

In addition, the microbial fluid tank or the simple tank of the microbial fluid transfer means are insulated from each other, and each tank is provided with a heater, an acid tank, an alkali tank, and a nutrient tank, so that the activity of the microorganisms is maintained in an optimum state, so that the purification efficiency is improved. There is an advantage to be higher.

Claims (10)

Installing a microbial fluid tank on one side of the contaminated soil (100); Connecting a pipe-type microbial fluid injector to the microbial fluid tank (200); Excavating a plurality of injection holes in the contaminated soil (300); Inserting an injection well connected to a bogie-type high pressure air injector and a microbial fluid injector into an excavation hole and then injecting high pressure air (400); Underground high pressure liquid injection method for purification of contaminated soil, characterized in that comprising the step of injecting a microbial fluid (500). A microbial fluid tank temporarily fixed to one side of the contaminated soil; A high pressure air injector in which an air compressor is mounted on a movable truck; A microbial fluid injector seated on a movable truck and configured to be a liquid injection pump connected to the microbial fluid tank by piping; It is inserted into the injection hole excavated in the contaminated soil, high pressure air injector for underground soil high-pressure liquid injection device, characterized in that it comprises an injection well connected to each pipe connected to the high pressure air injector. The method of claim 2, wherein the microbial fluid tank, Underground high pressure liquid injection device for purifying contaminated soil, characterized in that the heater is coupled, the heat treatment. The method of claim 2, wherein the microbial fluid tank, Underground high pressure liquid injection device for purification of contaminated soil, characterized in that the acid tank, alkali tank, nutrient tank is additionally connected. A microbial fluid tank temporarily fixed to one side of the contaminated soil; A high pressure air injector in which an air compressor is mounted on a movable truck; A microbial fluid transfer means comprising a movable trolley and a microbial fluid simple tank connected to the microbial fluid tank in a state of being seated on the trolley; A microbial fluid injector seated on a movable trolley and consisting of a liquid injection pump connected to the microbial fluid transfer means; It is inserted into the injection hole excavated in the contaminated soil, high pressure air injector for underground soil high-pressure liquid injection device, characterized in that it comprises an injection well connected to each pipe connected to the high pressure air injector. According to claim 5, The microbial fluid simple tank constituting the microbial fluid transfer means, Underground high pressure liquid injection device for purifying contaminated soil, characterized in that the heater is coupled, the heat treatment. According to claim 5, The microbial fluid simple tank constituting the microbial fluid transfer means, Underground high pressure liquid injection device for purification of contaminated soil, characterized in that additionally connected to the acid tank, alkali tank, nutrient tank additionally installed in the tank for transporting microbial fluid simple tank.  The method of claim 2 or 5, wherein the injection tablet, An upward open tubular body with a lower end blocked; Underground high pressure liquid injection device for purifying contaminated soil, characterized in that the coupling is coupled to the open upper end of the body and branched in two directions. The method of claim 8, wherein the outer peripheral surface of the body, Underground high pressure liquid injection device for purification of contaminated soil, characterized in that a plurality of through holes formed through. The method of claim 9, wherein the through hole, Underground high pressure liquid injection device for purification of contaminated soil, characterized in that the upper, lower straight.

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