KR102188855B1 - Washing apparatus for contaminated soil - Google Patents

Abstract

The present invention relates to a hopper part formed so that contaminated soil and water are injected together, a spray part formed to spray high-pressure water to desorb contaminants from the contaminated soil introduced through the hopper part, and a movement path for the contaminated soil. It is formed and provided to increase the flow velocity of the contaminated soil in a state in which the contaminants are desorbed through the spraying unit, and includes a desorbing unit for continuously desorbing the contaminants by using hollow bubbles generated during depressurization.

Description

Washing apparatus for contaminated soil}

The present invention relates to a contaminated soil cleaning apparatus, and more particularly, to a contaminated soil cleaning apparatus that improves cleaning efficiency by removing foreign substances or contaminants of fine contaminated soil particles.

In general, in the case of soil pollution, once it is contaminated, it may cause secondary pollution to the surrounding environment, such as adversely affecting the quality of surface water and groundwater, so the contaminated soil must be purified and restored at the site in a short time. .

From the above point of view, the soil cleaning technique was first developed in the United States in the late 1970s, and is currently one of the most frequently used patented technologies in many countries, including the United States, Germany, and the Netherlands. Since it is very broad and has a wide range of applications, it is recognized as one of the purification techniques that have great field application and excellent economic efficiency in light of the current situation in which various organic pollutants and heavy metals are discharged in large quantities.

Recently, soil pollution in various oil-handling plant areas including oil refineries has emerged as a serious social problem, and such contaminated soil is efficiently excavated and efforts are made to restore it.

Generally speaking, soil washing techniques can be largely divided into Ex-situ washing techniques and In-situ washing techniques. These Ex-situ washing techniques are often referred to as soil washing. Distribution of substances in soil and soil After excavating the contaminated soil in the treatment range by grasping the physical/chemical characteristics of the plant, it is a technique of washing the contaminated soil using an appropriate cleaning solution. It can be divided into one-site treatment and off-site treatment.

In addition, the in-situ cleaning technique installs a cleaning solution injection well, a cleaning solution discharge well, a washing effluent treatment facility, a pump and instrumentation facility, and a volatile material treatment facility on a contaminated site without excavating the soil to remove the wash water from the soil. It is a technique of circulating and cleaning, which has a long treatment time, and it is difficult to recover the cleaning solution in the cleaning device due to clogged soil pores.

Recently, in order to improve cleaning efficiency, a cleaning device for separating contaminants contained in fine contaminated soil particles that are relatively difficult to clean by putting contaminated soil into a cleaning device and cleaning it through a chemical and agitator has been developed.

It is an object of the present invention to achieve primary desorption of contaminants through high-pressure water injection and increase in flow velocity, and at the same time, to cause decompression of contaminated soil including water, by the collapse of the void bubbles generated at this time. It is intended to provide a contaminated soil cleaning device capable of effective removal through a simple physical treatment process by allowing secondary removal by an impact applied to the surface of the soil.

The contaminated soil washing apparatus according to the present invention includes a hopper part formed to put contaminated soil and water together, an injection part formed to spray high-pressure water in order to desorb contaminants from the contaminated soil introduced through the hopper part, and the contamination. It forms a movement path for the soil, is provided to increase the flow velocity of the contaminated soil while the contaminants are desorbed through the injection unit, and continuously desorbs the contaminants by using the cavity bubbles generated during decompression. It characterized in that it comprises a detachment part.

Here, the desorbing part is formed to gradually decrease in diameter from the inlet to increase the flow velocity of the contaminated soil, and a crushing section for generating shear stress and vertical stress on the contaminated soil so that the contaminant is pulverized. , An enlarged section is formed so that the inner diameter is enlarged at the end of the grinding section, and the pressure on the fluid passing through the grinding section is reduced to generate voids on the surface of the contaminated soil, and the impact force generated when the voids collapse And a detachment section formed to detach the contaminants adhered to the surface of the contaminated soil.

The injection unit is formed so that high-pressure water in an amount relatively larger than the amount of water injected into the hopper unit is injected toward the pulverization section, and the components of the water injected into the hopper unit are components of the high-pressure water injected from the injection unit and It consists of the same ingredients.

In addition, the detachment part is formed above the exit side of the detachment section, is formed at a collecting port forming a collection path for collecting the volatilized pollutants, and is formed below the exit side of the detachment section, in a state in which the volatilized pollutants are removed. It has a discharge port forming a discharge path to discharge the washing slurry.

Meanwhile, the contaminated soil washing apparatus according to the present invention further includes a separating unit for separating the washing slurry for each particle by continuously circulating the washing slurry discharged along the discharge path.

Here, the separating unit is disposed below the discharge port so that the washing slurry is supplied by a storage tank in which the washing slurry is stored along the discharge path, and a supply pump provided inside the storage tank, and the washing slurry has a particle size. And a vibrating body connected to the cyclone to be separated according to and connected to the cyclone, and to remove water and finally discharge it in a state of purified soil as particles of the washing slurry are separated and discharged in a size equal to or larger than a preset size.

In addition, the discharge port has a control member installed to selectively limit the amount of water discharged to the storage tank.

In addition, the separating unit is connected to the cyclone and includes a dehydration means configured to be discharged to the outside and disposed of together with water as the particles of the washing slurry are separated and discharged to a size less than a preset size.

The present invention allows the primary desorption of contaminants to occur through high-pressure water injection and an increase in flow rate, and at the same time, decompression occurs for contaminated soil including water. By making secondary desorption by the impact applied to the surface, effective desorption can be achieved through only a simple physical treatment process.

Accordingly, the present invention is independent of the kind and characteristics of contaminants and can be treated in a wide range, thereby expanding the versatility of application of the device, and removing contaminants only through pure water without using separate chemicals. Therefore, the washing water can be easily reused and thus economical treatment can be performed.

1 is a view schematically showing a contaminated soil cleaning apparatus according to an embodiment of the present invention.
2 is a view showing a structure of a stripping unit for a contaminated soil cleaning apparatus according to an embodiment of the present invention.
3 is a diagram showing a principle of pulverizing contaminants of a stripping unit for a contaminated soil cleaning apparatus according to an embodiment of the present invention.
4 is a view showing a separating part for the contaminated soil washing apparatus according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Advantages and features of the present invention, and a method of achieving the same will become apparent with reference to the embodiments described below in detail together with the accompanying drawings.

However, the present invention is not limited by the embodiments disclosed below, but will be implemented in various different forms, only the present embodiments are intended to complete the disclosure of the present invention, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the scope of the invention to those who have, and the invention is only defined by the scope of the claims.

In addition, when it is determined that related well-known technologies or the like may obscure the subject matter of the present invention in describing the present invention, detailed descriptions thereof will be omitted.

1 is a diagram schematically showing a contaminated soil cleaning apparatus according to an embodiment of the present invention, and FIG. 2 is a view showing a structure of a stripping unit for a contaminated soil cleaning apparatus according to an embodiment of the present invention.

In addition, FIG. 3 is a view showing a principle of crushing contaminants of a desorbing unit for a contaminated soil washing apparatus according to an embodiment of the present invention, and FIG. 4 is a view showing a separating unit for a contaminated soil washing apparatus according to an embodiment of the present invention. .

As shown in FIG. 1, the contaminated soil cleaning apparatus according to the present embodiment includes a hopper unit 100, an injection unit 200, and a detachment unit 300.

First, although the hopper unit 100 is not shown in the drawing, foreign substances including stones (gravel) having a certain particle size or more for contaminated soil (soil to be selected) are discharged to the outside, and soil and gravel having a certain particle size or less are selected. , In a state in which the contaminated soil is crushed to improve the grain shape and the contaminated soil adhered to the gravel is separated, the contaminated soil and water are formed to be added together.

The injection unit 200 is made in the form of a nozzle, and is for desorbing the adhered contaminants among contaminated soil introduced through the hopper unit 100. It is formed to spray high-pressure water having a predetermined pressure toward the input contaminated soil.

A separate pressure gauge (not shown) may be installed in the spray unit 200, and accordingly, the pressure of water sprayed toward the contaminated soil is measured, and selective control is performed as much as a pressure value capable of effectively desorbing the adhered contaminants. Can be done.

Here, the amount of water sprayed at high pressure through the injection unit 200 is preferably set to a larger amount than the amount of water injected together with the contaminated soil in the hopper unit 100, and the water component injected into the hopper unit 100 It is preferably made of the same general water component as.

This allows general water to be used for desorption, not a fluid containing a separate desorption agent as in the prior art, so that water (washing water) can be reused in the process of separating contaminants including the separating unit 400 later. It is to be.

Meanwhile, as shown in FIG. 2, the desorbing unit 300 forms a movement path for contaminated soil, and in a state in which contaminants are partially desorbed by high-pressure water, the flow rate for contaminated soil moving with water is It is arranged to increase.

The desorbing unit 300 has a structure in which the pressure acting toward the contaminated soil is reduced, so that the contaminants adhered to the contaminated soil with the spray unit 200 are continuously desorbed by using the generated cavity. do.

To this end, the detachment part 300 is formed along the length direction and is provided with a crushing section (A), an enlarged section (B), and a detaching section (C).

First, the pulverization section (A) is formed so that the diameter gradually decreases from the inlet to increase the flow velocity of the contaminated soil, and generates shear stress and vertical stress on the contaminated soil so that the contaminant is crushed.

That is, in the grinding section (A), since the diameter of the contaminated soil is formed to be small when the contaminated soil moves together with water, the pressure acting on the moving contaminated soil increases and the flow rate increases. When sprayed, as shown in FIG. 3, effects of attrition and disintegration are also generated along with shear stress and normal stress, so that contaminants adhered to contaminated soil may be detached.

The enlarged section (B) is formed so that the inner diameter is enlarged at the end of the grinding section (A), thereby reducing the pressure of the fluid passing through the grinding section (A) so that voids are generated on the surface of the contaminated soil. .

In other words, the fluid pressure on the surface of an object that moves through the liquid on a highway decreases, which is called'Bernoulli's Theorem'. It forms a cavity.

Such a shape is a phenomenon that occurs frequently when operating a hydro turbine or a propeller for a ship, and sometimes occurs on the pressure surface, but mainly occurs on the back of the wing, and the generated air bubbles rapidly occur when the pressure reaches a high pressure area. It breaks, causing noise or vibration, and lowering the efficiency of the turbine or propeller.

In this implementation, the above-described cavitation is used, and the structural feature, that is, the decompression of the contaminated soil that moves with water through the enlarged section (A) with an enlarged diameter is made to actively promote cavitation buble. By allowing it to be generated, it is possible to improve the cleaning ability of contaminated soil by using the energy (micro jet) ejected during the process of generating voids and decay.

In more detail, as shown in FIG. 3, when cavity bubbles are generated by decompression, these cavity bubbles are located on the surface of the contaminated soil. At this time, the impact energy generated by the collapse of the cavity bubbles in the detachment section (C) As a result, the desorption or oxidation effect of contaminants can be expected, and thus the cleaning ability for contaminated soil can be improved.

As a result, in the present embodiment, since it is generally generated by decompression and causes noise or vibration, and causes a decrease in efficiency, the enlarged section with an enlarged diameter (B), as opposed to a conventional structure in which the occurrence is reduced. By actively generating a larger amount of air bubbles through the contaminated soil, it is possible to more effectively desorb contaminants adhering to the contaminated soil through the collapse of the cavity bubbles moving to the contaminated soil surface.

In addition, in this embodiment, pollutants can be removed through physical treatment by spraying high-pressure water through the spraying unit 200 and generation and collapse of voids due to structural characteristics. Because of this, it is possible to eliminate the separate process of separating contaminated soil through a vibrator, cyclone, etc., which were performed according to the contaminated soil component as in the past, and it is possible to separate contaminants regardless of the type of contaminated soil Simplification of can be achieved.

In addition, the desorption section (C) is formed to desorb contaminants adhered to the surface of the contaminated soil by using the impact force generated when the cavity bubbles collapse. In this desorption section (C), the contaminated soil cleaned through the cavity bubbles And the volatilized pollutants coexist with water, the volatilized pollutants are discharged to the outside, and the polluted soil from which the pollutants have been removed is discharged to the separation unit 400 in the form of a washing slurry 10.

To this end, the removal unit 300 includes a collection port 310 and an outlet port 320.

The collecting port 310 is formed at the top of the exit side of the detachment section C, and forms a collecting path for collecting pollutants generated when the public bubbles collapse, that is, volatilized.

In addition, the discharge port 320 is formed under the outlet side of the desorption section C, and forms a discharge path so that the washing slurry 10 in a state in which the volatilized pollutants have been removed through the collecting port 310 is discharged.

In this way, the washing slurry 10 discharged through the discharge port 320 is separated according to the particle size and moved to the separation unit 400 so that it can be finally purified with purified soil.

Here, a separate adjusting member (not shown) may be installed at the discharge port 320 to selectively limit the amount of the washing slurry 10 discharged toward the separating unit 400, and such an adjusting member (not shown) As the valve consists of a valve and its state is positioned in the closed position, overflow due to the washing slurry 10 discharged from the storage tank 410 can be prevented in advance.

As described above, the crushing section (A), the enlarged section (B), the desorption section (C), and particularly the desorption section (C) is preferably made of a material of Teflon used for atomic bombs, frying pans, Gore-Tex, and the like, This is a section in which cavitation occurs in the case of the detachment section (C).In the case of cavity bubbles, when the pressure reaches the part, it breaks rapidly, causing not only noise or vibration, but also abrasion, so the noise generated in the detachment section (C) This is to prevent the occurrence of problems such as vibration, wear, etc.

On the other hand, the separating unit 400 is disposed below the discharge port 320 as shown in FIG. 4, and is to continuously circulate the contaminated soil discharged along the discharge path so that the contaminated soil and the contaminated material are finally separated, A storage tank 410, a cyclone 420 and a vibrating body 430 are provided.

The storage tank 410 has a predetermined size and a storage space is provided, and the washing slurry 10 disposed below the discharge port 320 and discharged along the discharge path is stored.

The cyclone 420 corresponds to a general cyclone device that separates and collects from a liquid by applying a centrifugal force to abnormal particles contained in the fluid by using a fluid as a swirling flow, and the components are also made the same as the general cyclone device, When the washing slurry is supplied by the supply pump P provided in the storage tank 410, the washing slurry is separated according to the particle size.

If, through the cyclone 420, the washing slurry particles are separated into a preset size, for example, less than 0.075mm, they are moved to the dehydration means 440, and accordingly, water and the washing slurry are discharged to the outside together. It is discarded through oil-water separation and coagulation treatment.

The vibrating body 430 is connected to the cyclone 420, and as the cleaning slurry particles are separated and discharged into a size larger than a preset size, for example, 0.075mm or larger, it is supplied in a state of purified soil. Let it drain.

That is, the vibrating body 430 filters the washing slurry transferred from the cyclone 420 through vibration to allow dehydration, and a filter membrane (not shown) is provided therein to prevent separation through the cyclone 420 as described above. When a washing slurry of less than a set size is included during the process, the separation is performed once more, thereby effectively discharging pure purified soil.

Here, it is preferable that the unit area of the plurality of holes forming the filter film (not shown) is a predetermined size, for example, less than 0.075 mm so that relatively small particles can be separated once more.

As such, the washing slurry discharged in the process of separating once more is discharged to the storage tank 410 located below it, and through the repeated circulation process resupplied through the supply pump P, the pure purified soil is effectively discharged. can do.

The present invention allows the primary desorption of contaminants to occur through high-pressure water injection and an increase in flow rate, and at the same time, decompression occurs for contaminated soil including water. By making secondary desorption by the impact applied to the surface, effective desorption can be achieved through only a simple physical treatment process.

Accordingly, the present invention can expand the versatility of application of the device by allowing a wide range of treatments regardless of the kind and characteristics of the pollutant, and it is possible to remove the pollutant only through pure water without the use of separate chemicals. Therefore, the washing water can be easily reused and thus economical treatment can be performed.

The present invention has been described with reference to the embodiment(s) shown in the drawings, but this is only exemplary, and various modifications may be made therefrom by those of ordinary skill in the art, and the above-described embodiment It will be appreciated that all or part of (s) may be optionally combined and configured. Therefore, the true technical scope of the present invention should be determined by the technical spirit of the appended claims.

10: washing slurry 20: purified soil
100: hopper part 200: injection part
300: tally part 310: collection port
320: outlet 400: separation unit
410: reservoir 420: cyclone
430: vibrating body 440: dehydration means
A: grinding section B: enlarged section
C: Desorption section P: Supply pump

Claims (8)

A hopper part formed so that contaminated soil and water are added together;
An injection unit formed to inject high-pressure water to remove contaminants from the contaminated soil introduced through the hopper unit; And
A movement path for the contaminated soil is formed, the flow rate of the contaminated soil is increased while the contaminant is removed through the spraying unit, and continuous removal of the contaminant is performed by using the cavity bubbles generated during decompression. It includes;
The detachment part,
A crushing section formed so as to gradually decrease in diameter from the inlet to increase the flow velocity of the contaminated soil, and generating shear stress and vertical stress on the contaminated soil so that the contaminant is crushed;
An enlarged section formed at an end of the grinding section to enlarge an inner diameter, and reducing a pressure on the fluid passing through the grinding section to generate voids on the surface of the contaminated soil; And
A desorption section that passes through the pulverization section and is primarily desorbed from contaminants, and is formed to secondarily desorb contaminants adhered to the surface of the contaminated soil by using an impact force generated when the cavity bubbles collapse. Equipped,
The detachment section is made of a Teflon material to prevent noise, vibration, and abrasion due to the breakage of the cavity bubbles,
The injection unit,
It is formed such that high-pressure water in an amount relatively larger than the amount of water injected into the hopper is sprayed toward the pulverizing section,
The water injected into the hopper part is made of the same component as the high-pressure water sprayed from the spray part, and is discharged and reused when the washing slurry is separated,
The detachment part,
A collecting port formed above the exit side of the detachment section and forming a collecting path for collecting the volatilized pollutants; And
And an outlet formed below the outlet side of the desorption section and forming a discharge path to discharge the washing slurry in a state in which the volatilized pollutants have been removed, and
Further comprising a separating unit for separating the washing slurry for each particle by continuously circulating the washing slurry discharged along the discharge path,
The separation unit,
A storage tank disposed below the discharge port to store the washing slurry along the discharge path;
A cyclone for supplying the washing slurry by a supply pump provided in the storage tank and separating the washing slurry according to particle size; And
A vibrating body connected to the cyclone and removing water as particles of the washing slurry are separated and discharged in a size equal to or larger than a preset size and finally discharged to a state of purified soil; and
The outlet is,
It has a control member installed to selectively limit the amount of water discharged to the storage tank,
The separation unit,
Contaminated soil washing apparatus comprising a dehydration means connected to the cyclone and configured to be discharged to the outside and disposed of together with water as the particles of the washing slurry are separated and discharged to a size less than a preset size. delete delete delete delete delete delete delete

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