KR20100114358A - High-pressure air and liquid injection apparatus for remediation of contaminated soil and groundwater - Google Patents

Abstract

PURPOSE: A high-pressure air and liquid injection apparatus for remediation of contaminated soil and groundwater is provided to quickly remediate contaminated soil and groundwater, thereby shortening a purifying period. CONSTITUTION: A high-pressure air and liquid injection apparatus for remediation of contaminated soil and groundwater includes an air head, an air supply nozzle, a supply rod, a diaphragm valve, and a liquid medicine injection hole. The air head stores compressed air. The air supply nozzle is formed in the air head. The air supply nozzle supplies compressed air from a storage tank(11) storing the compressed air to the air head. The liquid medicine injection hole is installed in the bottom of the diaphragm valve and supplies liquid medicine to the injection rod.

Description

High-pressure air and liquid injection apparatus for remediation of contaminated soil and groundwater}

The present invention relates to a high-pressure injection device of air and chemical liquid for restoring contaminated soil and groundwater, and more particularly, by injecting high-pressure air generated through a compressor into an oil pollution zone of soil with microorganisms or surfactants. The present invention relates to an air and chemical high pressure injection device for restoring soil and groundwater.

As industrial industrial products, oil and heavy metals have been expanded since the industrialization process, only the production facilities have been expanded without any facilities that clean up polluting materials to achieve the maximum effect with little investment without considering environmental problems. The pollution of soil and groundwater is getting serious due to the pollution. The polluted groundwater moves inside the soil, accelerating the spread of pollution and contaminating a wide range of soil and groundwater. Is causing.

The methods of restoring soil and groundwater contaminated with heavy metals or oils can be broadly classified into the ex-situ treatment method on the ground of the site and the in-situ treatment method on the ground of the site. The method of treatment should be based on the location of the contaminated soil.

The ground treatment method consists of physical treatment method, biological treatment method, and chemical treatment method according to the method of purifying contaminated soil.The method of separating contaminants through physical treatment method like soil washing method, solvent extraction method, chemical oxidation method, etc. There is a chemical treatment method for decomposing and separating contaminants using chemical additives, a biological treatment method for inducing decomposition of contaminants using microorganisms such as biopile and landfarming.

Underground treatment method is to insert the well into the ground to decompose and extract the desired object through the well. Soil vapor extraction (SVE), air sparging (Soil), soil flushing, oxidation / reduction method Physics that injects air by applying vacuum pressure to the soil layer and forcibly extracts VOCs gas present in the soil layer at sub-atmospheric pressure or injects surfactant and chemical oxidant into the injection well to clean or decompose contaminants and extract it through the extraction well. Chemical methods and bioventing Treatment of contaminants in unsaturated soil layers and groundwater layers in saturated areas, such as bio sparging and bioslurping, by inducing biological degradation through microbial activity Are largely classified into biological methods.

In the underground treatment method, the physical and chemical treatment method is to inject air, microorganism, chemical oxidant, and surfactant through injection pump to inject through the pump to decompose and wash the target object or decomposed gas through extraction well. to be. Since the underground treatment method induces chemical and biological decomposition of target objects such as oil and heavy metals in the ground, the treatment efficiency is determined depending on how effectively the contact with the treatment target is performed. Therefore, it is important to artificially inject air and chemical liquid from the ground to induce maximum contact with the treatment object.

Conventional underground treatment method forms a hole through a well to insert chemicals (oxidants, surfactants, nutrients, etc.) into the ground, inserts pipes, and flows the chemical to the depth of the contaminated soil, causing physical, chemical, and biological degradation. The drug is administered to induce the drug, but the range causing the decomposition of the drug is limited, and the infusion diffusion range is limited so that a large amount of the drug must be injected. It can cause soil deterioration, which causes another problem. Since the process of technology of the underground treatment method is applied to the complex process, it is possible to change the process into a method that can be quickly adapted to environmental conditions according to the characteristics of soil and pollutants. There are problems such as difficulty.

Utility Model Registration No. 308522 "High Pressure Injection Well for Restoring Polluted Soil and Groundwater" is a high pressure injection well to inject an oxidant. Referring to FIGS. 1A and 1B, the lower end has a closed body 3. A plurality of nozzles 4 are formed at the lower end of the body 3 and the upper end of the body is connected to the high pressure pump 1.

The conventional high pressure injection well configured as described above forms a space directly injected at a high pressure, or when the oxidant is injected by inserting it into an already formed well, compressed air is leaked to the upper and side sides of the opening, so that the oxidant is accurately extracted from the soil and groundwater. There is a problem that the efficiency is inferior because it can not be delivered to the side, and because a separate power source is required to operate the high-pressure pump, many facilities are required, and there is a limit in restoring the contaminated soil while moving the facility, resulting in excessive costs for transportation and transportation. There is a problem.

In addition, since the conventional treatment method injects the air and the chemical liquid below atmospheric pressure, the air and the chemical liquid injected through the injection well have a narrow diffusion radius and a pressure loss occurs due to the distance between the injection system and the well. It is not possible to inject air and chemicals at a certain pressure. Therefore, due to the characteristics of soil purification, the treatment efficiency for the contaminated site to be treated should be reduced to a certain pollution load rate, but otherwise, the purification uncertainty and the completion of the purification are difficult, resulting in many operational difficulties. Therefore, in order to compensate for this problem, a technique of injecting air and chemical liquid by injecting at a high pressure per well by using a portable high-pressure injection device such as Utility Model Registration No. 402215 'Vehicle-mounted oxidizer injection device' has appeared. Since continuous operation is difficult and operation of equipment is performed, there is a problem of excessive manpower input or operation cost.

The present invention has been made to solve the above problems, an object of the present invention, by injecting a high-pressure air generated through the compressor into the oil pollution zone of the soil at a high pressure with a chemical solution such as microorganisms or surfactants and the like pulse type It is to provide a high-pressure injection device for air and chemical liquid to quickly restore the contaminated soil and ground water by spraying.

In order to solve the above problems, air and chemical liquid high-pressure injection device for restoring contaminated soil and groundwater according to the present invention, an air head for storing compressed air; An air inlet formed in the air head to supply compressed air to the air head from a storage tank storing compressed air produced by a compressor; An injection rod installed vertically under the air head and having a high-pressure injection nozzle having a venturi tube shape for injecting compressed air and a chemical liquid at a lower end thereof; A diaphragm valve installed on the injection rod to inject compressed air stored in the air head at a constant pressure; It is characterized in that it comprises a chemical liquid inlet is installed in the lower portion of the diaphragm valve to supply the chemical liquid to the injection rod.

In addition, the air and the chemical liquid high-pressure column for restoring contaminated soil and groundwater according to the present invention, the distributor for storing the compressed air; An air inlet formed in the distributor and supplying the compressed air to the distributor from a storage tank storing the compressed air produced by the compressor; A plurality of outlets having a diaphragm valve for injecting the compressed air stored in the distributor at a constant pressure; An injection rod connected to the discharge port and a pipe, and having a venturi tube-shaped high-pressure jet nozzle for spraying compressed air and a chemical liquid at a lower end thereof; Is installed on the injection rod is characterized in that it comprises a chemical liquid inlet for supplying a chemical liquid to the injection rod.

Preferably, the diaphragm valve is further provided with a time kit for controlling the time interval for injecting the compressed air, that is, the injection period.

Air and chemical liquid high-pressure injection device for restoring contaminated soil and groundwater according to the present invention having the above characteristics, as a ground and ground treatment method for purifying soil and groundwater contaminated with oil or heavy metal by physical chemical biological method, Contaminated soil and groundwater by spraying the chemical solution at high pressure into the oil pollution area of the soil selectively according to the purification efficiency of soil pollution such as microorganisms, surfactants, chemical oxidants, etc. Can be quickly restored to shorten the purification period, which is cost and technically efficient.

In addition, air can be injected at a constant pressure regardless of the distance between the air injection system and the injection well, and since it is injected at a high pressure, the purification method can be quickly changed by selectively injecting air and chemical liquids with a wider influence radius than the existing system. Can be operated. And since the injection rod directly inserts the injection rod to inject air and chemical liquid without the need for a separate screen tube of the injection tube, it is possible to save half the facility cost input to the existing tube.

In addition, it is necessary to install horizontal and vertical pipes for each polluted layer, and various installation and operation of the conventional biopile method such as narrowing the influence radius of air injection and difficulty in controlling moisture in soil due to the blockage of the horizontal pipes and the air channeling phenomenon. Can solve the problem. That is, if the high-pressure injection device of the present invention is installed vertically on the accumulated soil, it is possible to directly inject air, moisture, and nutrients at high pressure without the need for a separate horizontal or vertical pipe, which is efficient in terms of facility installation or operation.

The present invention relates to an air and a chemical liquid high-pressure injection device for injecting compressed air and a chemical liquid for restoring contaminated soil and groundwater. Referring to FIG. 3, an embodiment of the high-pressure injection device will be described. The high pressure injection device 30 has an air head 31 for storing compressed air in a basic configuration, and an injection rod 32 inserted into a contaminated area and spraying the compressed air stored in the air head 31 together with a chemical solution at a high pressure. It consists of).

 The air head 31 is a kind of small storage unit that stores compressed air. The air head 31 supplies compressed air to the air head 31 from a storage tank 11 storing compressed air produced by the compressor 10. An injection rod 34 and an injection rod having a high pressure injection nozzle 38 having a venturi tube shape for injecting compressed air and a chemical liquid are installed at a lower portion of the air head 31. 32 is provided, a pressure gauge 33 for indicating the pressure in the air head 31 may be further attached.

A diaphragm valve 35 is installed on the injection rod 32 to inject the compressed air stored in the air head 31 at a constant pressure, and an injection rod 32 is disposed below the diaphragm valve 35. The chemical liquid injection hole 37 for supplying the chemical liquid to the compressed air ejected into the () is further installed, the high-pressure injection nozzle 38 of the venturi tube shape for injecting the compressed air and the chemical liquid at the lower end of the injection rod 31 The air injected at a constant pressure from the diaphragm valve 35 passes through the injection rod 32 at a high pressure together with the chemical liquid introduced into the chemical liquid inlet 37 and passes through the venturi tube at the end. The speed is faster and is injected at high pressure to the contaminated area through the injection hole of the high-pressure jet nozzle (38).

The pollutant medium is present in various forms such as pollutants present in the gas phase in soil voids, pollutants adsorbed on the soil, and fluidized phase pollutants floating on the water table due to its lighter weight than water and pollutants dissolved in the ground water. As such a variety of contaminant medium is present, various kinds of chemicals that can restore contaminants such as microorganisms, microbial nutrients, surfactants, oxidants, or heavy metal stabilizers may be used as the chemicals for treating them.

4 shows another embodiment of the high pressure injection device, using a distributor 50 for supplying compressed air to a plurality of injection rods 55 instead of the air head 31. Dispenser 50 is a kind of small storage unit for storing the compressed air, the air inlet for supplying the compressed air to the distributor 50 from the storage tank 11 for storing the compressed air produced by the compressor ( 51 and a plurality of outlets 52 having a diaphragm valve for injecting the compressed air stored in the distributor 50 at a constant pressure, and the outlet port 52 has a compressed air and a chemical liquid at a lower end thereof. An injection rod 55 having a venturi tube-shaped high pressure injection nozzle 57 for injecting the same is connected to the pipe 54. The dispenser 50 may further be equipped with a pressure gauge 53 for indicating the pressure in the dispenser 50.

The upper end of the injection rod 55 is connected to the outlet 52 of the distributor 50 and the pipe 54, and supplies the chemical liquid to the compressed air ejected to the injection rod 52 on the injection rod 55. The chemical liquid inlet 56 is further installed.

Since the degree of consolidation and soil quality in the contaminated soil affects the influence radius and delivery coefficient of air and chemicals, it is preferable to spray the chemicals and air in the form of a pulse that sprays the chemicals and air at a high time interval under high pressure. Therefore, it is preferable to further attach a time kit to the diaphragm valve used in the high-pressure injection device of the present invention, which serves as a controller for controlling the time interval for spraying compressed air, that is, the injection cycle. On the other hand, the present invention is not intended to be the diaphragm valve or the time kit itself, but since the diaphragm valve and the time kit which are generally used are adopted in a high-pressure injection device for restoring contaminated soil or groundwater. Detailed description of these configurations will be omitted.

It is preferable to further attach the protective caps 39 and 58 around the venturi tube-shaped high pressure injection nozzles 38 and 57 provided at the ends of the injection rods 32 and 55.

Referring to the contaminated soil and groundwater restoration system is installed with a high-pressure injection device according to the present invention with reference to Figure 2, the drill rod drilled through the excavation equipment at a predetermined interval of about 1 to 3m above the ground of the contaminated area, the injection rod into the well After inserting (32), the extraction well 40 which is a pipe in which many slots or holes were formed is inserted between the injection rod 32 and the injection rod 32. At this time, the number of the high-pressure injection device 30 to be installed according to the capacity of the compressor 10 is determined.

Compressed air produced by the compressor (10) is stored in the storage tank 11 and supplied to a plurality of high-pressure injection device 30 is installed, the storage tank 11 and the air head 31 of each high-pressure injection device is a pipe Leads to. In addition, the chemical liquid stored in the chemical liquid injection tank 20 is supplied through the chemical liquid inlet 37 of each of the high pressure injection device through a pipe is injected into the contaminated area with the compressed air. Of course, although not shown, the means for controlling the amount of the chemicals to be injected will of course have to be installed.

When compressed air compressed at high pressure into the contaminated area and chemical liquid are injected together, the contaminants such as oil are decomposed and the decomposed material flows through the pores in the soil, and when the vacuum pump 42 installed on the ground is operated, the extraction well ( As the contaminants decomposed through the slots or holes formed in 40 are extracted, the liquid or the solid remains in the gas-liquid separator 41 and the gas is discharged to the outside through the exhaust gas treatment device 43.

2 illustrates an example in which a plurality of air heads 31 are connected to one storage tank 11, but in the case of using the distributor 50 according to another embodiment, the storage tank 11 may include one or more distributors 50. And supply compressed air to the plurality of injection rods 55 from the distributor 50.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and changes without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention but to describe the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

1A and 1B show a conventional system for restoration of contaminated soil and groundwater and a high pressure injection well used therein.

2 is a view showing a contaminated soil and groundwater restoration system installed with a high-pressure injection device of air and chemical liquid according to the present invention.

3 is a view showing the air and the chemical liquid high-pressure injection device according to the present invention.

Figure 4 is a view showing another embodiment of the air and the chemical liquid high-pressure injection device according to the present invention.

** Description of symbols for the main parts of the drawing **

10: compressor 11: storage tank

20: chemical injection tank

30: high pressure injection device 31: air head

32: injection rod 33: pressure gauge

34: air inlet 35: diaphragm valve

36: time kit 37: chemical injection

38: high pressure jet nozzle 39: protective cap

40: extraction well 41: gas-liquid separator

42: vacuum pump 43: exhaust gas treatment device

50: distributor 51: air inlet

52 outlet 53

54: pipe 55: injection rod

56: chemical injection hole 57: high-pressure jet nozzle

58: protective cap

Claims (4)

In the air and chemical liquid high-pressure injection device for injecting compressed air and chemical liquid for the recovery of contaminated soil and groundwater, the air and chemical liquid high-pressure injection device, An air head for storing compressed air; An air inlet formed in the air head to supply compressed air to the air head from a storage tank storing compressed air produced by a compressor; An injection rod installed vertically under the air head and having a high-pressure injection nozzle having a venturi tube shape for injecting compressed air and a chemical liquid at a lower end thereof; A diaphragm valve installed on the injection rod to inject compressed air stored in the air head at a constant pressure; A chemical liquid inlet installed at a lower portion of the diaphragm valve to supply a chemical liquid to an injection rod; Air and chemical liquid high-pressure injection device for restoring contaminated soil and groundwater, characterized in that comprises a. In the air and chemical liquid high-pressure injection device for injecting compressed air and chemical liquid for the recovery of contaminated soil and groundwater, the air and chemical liquid high-pressure injection device, A distributor for storing compressed air; An air inlet formed in the distributor and supplying the compressed air to the distributor from a storage tank storing the compressed air produced by the compressor; A plurality of outlets having a diaphragm valve for injecting the compressed air stored in the distributor at a constant pressure, the outlet being formed in the distributor; An injection rod connected to the discharge port and a pipe, and having a venturi tube-shaped high-pressure jet nozzle for spraying compressed air and a chemical liquid at a lower end thereof; A chemical liquid inlet installed on the injection rod to supply a chemical liquid to the injection rod; Air and chemical liquid high-pressure injection device for restoring contaminated soil and groundwater, characterized in that comprises a. The method according to claim 1 or 2, The diaphragm valve is a high pressure injection device for air and chemical liquid for restoring contaminated soil and groundwater, characterized in that the time kit (time kit) for controlling the injection cycle is further attached. The method according to claim 1 or 2, Air and chemical high pressure injection device for the restoration of contaminated soil and ground water, characterized in that the protective cap is further attached around the venturi tube-shaped high-pressure jet nozzle.

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