KR101672400B1 - Pollution soil remediation apparatus and system thereof - Google Patents

Abstract

The present invention relates to a polluted soil purification apparatus and a purification system.
Among them, the contaminated soil purifying apparatus includes a main body for providing a space in which mixed water is received, an oil skimmer installed on the upper side of the main body for collecting the suspended oil in the main body, A rotating unit for rotating the mixed water in the main body to prevent precipitation of fine particles, and a recovering unit for recovering the mixed water containing fine particles.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pollution soil purification system,

The present invention relates to a polluted soil purification apparatus and a purification system.

Generally, environmental pollution can be classified into air pollution, water pollution and soil pollution. In particular, the contaminated soil problem poses a serious threat to food production and not only causes water pollution through groundwater pollution, but also it is not easy to solve it compared to air pollution or water pollution.

Fossil fuels, such as petroleum, can be used in a wide variety of industrial fields and are used extensively, but due to a variety of reasons, such as marine oil spills, carelessness in transportation and storage, Contamination may cause soil.

Interest in techniques for artificially purifying soil contaminated by oil has increased as it takes a considerable period of time to naturally recover soil contaminated by oil.

Soil washing, thermal desorption, and bio remediation techniques have been proposed as conventional methods for purifying soil polluted by oil.

Specifically, the techniques described above are a technique for separating contaminants from the surface of a soil by using water or a surfactant.

This soil washing method has a problem in that when the soil contaminated with heavy oil or crude oil is treated, the amount of surfactant consumed becomes uneconomically excessive. When water comes into contact with heavy oil or crude oil, a tar ball is formed There is a problem that the phenomenon that the screen is clogged by the tar ball or the contact area of the surfactant is reduced and the treatment effect is sharply reduced.

Thermal desorption is a technique of purifying soil by volatilizing oil contaminants by applying heat to soil polluted by oil, and then burning volatile contaminants in a burner. When the volatilized pollutants are burned in the combustion chamber, dust is generated. The generated dust is filtered by a bag filter to minimize pollutants and then discharged to the atmosphere.

This thermal desorption method requires an amount of oxygen proportional to the carbon number of the contaminant when the volatilized contaminants are incinerated from the contaminated soil. If the cause of contamination of the soil is a light oil with a relatively low carbon number, it is not a problem when it is purified by thermal desorption. However, if the soil is contaminated by heavy oil having a relatively high carbon number, There is a problem that the amount of oxygen required for the filtration is also very large and the bag filter also has to be increased in proportion thereto.

Bio remedation is a microbial purification technology that can be treated only up to 5,000 mg / kg TPH according to the US EPA, and TPH is up to 5,000 mg / kg for soils contaminated with heavy oil or crude oil There is a problem that the treatment with microorganisms is limited. Here, TPH is an abbreviation of Total Petroleum Hydrocarbon, meaning total petroleum hydrocarbon, and the higher the TPH value, the more severe the contamination of the soil.

In addition, when the soil polluted with crude oil is left for decades, the light oil component having a relatively low carbon number contained in the crude oil will be blown away, leaving only the heavy oil component having the decomposition ability, It is difficult to apply the biomediation process because it is difficult to secure the moisture supply and ventilation required for microorganisms in a dry and sunny environment.

Korean Patent Publication KR10-2011-0087944

An embodiment of the present invention is to provide a polluted soil purification apparatus and a purification system that can prevent clogging due to co-precipitation of fine particles and coarse particles in mixed water containing contaminated soil and effectively purify the polluted soil.

A contaminated soil purification apparatus according to one aspect of the present invention is a contaminated soil purification apparatus for purifying mixed water containing fine particles, coarse particles, and oil, the apparatus comprising: a body for providing a space in which the mixed water is received; An oil skimmer installed on the upper side of the main body to recover the oil suspended in the main body; A transfer unit for discharging the coarse particles settled on the bottom of the main body; A rotating unit for rotating the mixed water in the main body to prevent precipitation of the fine particles; And a recovery unit for recovering mixed water containing the fine particles.

At this time, the rotary part may be a low speed impeller which is located on the upper side of the coarse particles settled on the bottom of the main body, and provides rotational force for flowing the fine particles.

The recovery unit may include a recovery unit formed on one side wall of the main body; And a boundary plate provided in the main body to surround the collection port and providing a recovery flow path between one side walls of the main body.

The conveying unit may include a conveying screw provided on a bottom of the main body to discharge the coarse particles settled on the bottom of the main body; And a driving motor for rotating the conveying screw.

A baffle plate spaced apart from an inlet of the main body to which the mixed water is introduced; And a high-speed impeller positioned between the inlet and the inlet to crush the agglomerates in the mixed water introduced at the inlet.

In addition, the conveying screw may be arranged to be inclined upward at the bottom of the main body.

In addition, the fine particles may include clay and silt that is thicker than the clay and higher than sand.

In addition, the coarse particles may include sand of 75 micrometers or more.

According to an aspect of the present invention, there is provided a polluted soil purification system including: a screen device for selecting gravel from a soil polluted by oil; A mixing device for introducing a separating agent for separating oil into the contaminated soil together with the input water to produce mixed water; A polluted soil purifier for recovering coarse particles and floating oil settled in the mixed water and turning the mixed water to prevent precipitation of fine particles; And a coagulating sedimentation apparatus for collecting and collecting fine particles in the coarse particles and the mixed water from which the oil is recovered.

At this time, the contaminated soil purifier includes a main body for providing a space for receiving the mixed water; An oil skimmer installed on the upper side of the main body to recover the oil suspended in the main body; A transfer unit for discharging the coarse particles settled on the bottom of the main body; A rotating unit for rotating the mixed water in the main body to prevent precipitation of the fine particles; And a recovery unit for recovering mixed water containing the fine particles.

In addition, the contaminated soil purifying apparatus may include a sump plate disposed to be spaced apart from an inlet of the main body into which the mixed water is injected; And a high-speed impeller positioned between the inlet and the inlet to crush the agglomerates in the mixed water introduced at the inlet.

The rotating part may be a low speed impeller which is located on the upper side of the coarse particles settled on the bottom of the main body and provides rotational force for flowing the fine particles.

In addition, the input water may be heated to room temperature or higher before being introduced into the mixing apparatus.

In addition, the flocculation and sedimentation apparatus can flocculate and precipitate the fine particles in the mixed water by providing a flocculant to the mixed water.

According to the embodiment of the present invention, the soil contaminated by oil or the like can be effectively separated into oil, macromolecule, and fine particles by using the difference in density of the material, thereby facilitating the purification of the contaminated soil.

Particularly, according to the embodiment of the present invention, since the mixed water containing the contaminated soil is pivoted at a low speed, clogging due to co-precipitation of fine particles and coarse particles contained in the mixed water can be prevented, It is effective to maintain and maintain.

1 is a block diagram illustrating a contaminated soil purification system according to an embodiment of the present invention.
2 is a configuration diagram showing a polluted soil purification apparatus according to an embodiment of the present invention.
3 is a state diagram showing the flow of mixed water in the contaminated soil purification apparatus according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, configurations and operations according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description may form part of the detailed description of the invention. However, the detailed description of known configurations or functions in describing the present invention may be omitted for clarity.

While the invention is susceptible to various modifications and its various embodiments, it is intended to illustrate the specific embodiments and the detailed description. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

And terms including ordinals such as first, second, etc. may be used to describe various elements, but the constituent elements are not limited by such terms. These terms are used only to distinguish one component from another. It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise.

1 is a block diagram illustrating a contaminated soil purification system according to an embodiment of the present invention.

As shown in FIG. 1, the polluted soil purification system according to the embodiment of the present invention prevents clogging due to co-precipitation of fine particles and coarse particles contained in contaminated soil, Can be generated.

The contaminated soil purification system may include a screen device 10, a mixing device 20, a polluted soil purification device 100, and a flocculation and sedimentation device 30.

The screen device 10 can be provided with a contaminated soil contaminated by oil or heavy oil, such as crude oil, to filter out large particles of the contaminated soil, for example, gravel. In the present embodiment, the screen device 10 is described as being provided with a contaminated soil contaminated with heavy oil or crude oil. However, the idea of the present invention is not limited to this, and the screen device 10 is not limited to heavy oil or crude oil Contaminated soil contaminated by a kind of oil may be provided.

The screen device 10 may include a screen for screening gravels of a predetermined size or greater from the contaminated soil. The sorting screen may include a plurality of sorting holes of predetermined diameter capable of sorting the gravel included in the contaminated soil, and the contaminated soil that has passed through the sorting hole may be provided to the mixing device 20.

The mixing device 20 can receive the contaminated soil filtered by the screen device 10, the separating agent for separating the oil from the contaminated soil, and the input water, and mix them uniformly to generate mixed water. Here, the input water may be supplied to the mixing apparatus 20 while being heated to room temperature or higher. The separating agent may be a gasoline, a disel, a kerosene, an isopropyl alcohol, a benzene, a toluene, or the like in order to chemically separate heavy oil or crude oil adsorbed on the contaminated soil. toluene, mineral oil, phosphoric acid, sulfuric acid or hydrochloric acid.

In the mixing device 20, the oil adhered to the soil particles of the contaminated soil can be separated by the separating agent in the process of uniformly mixing the contaminated soil, the separating agent, and the input water. For example, at a temperature higher than room temperature, the viscosity of the oil (e. G., Heavy oil or crude oil) attached to the soil particles is lowered so that the separating agent reacts with the oil attached to the soil particles of the contaminated soil, Can be separated. Mixed water mixed in the mixing apparatus 20 can be transferred to the contaminated soil purification apparatus 100.

The polluted soil removing apparatus 100 can be provided with the mixed water mixed in the mixing apparatus 20 and can separate the oil and the coarse particles from the mixed water so that the precipitation of the fine particles contained in the mixed water is prevented. At this time, the oil and coarse particles separated from the polluted soil purification apparatus 100 can be transferred to a separate post treatment facility (not shown), and the remaining mixed water containing the fine particles is transferred to the coagulating sedimentation apparatus 30 . The specific configuration of the contaminated soil purification apparatus 100 will be described later.

The flocculation and sedimentation apparatus 30 flocculates and precipitates fine particles such as clay, silt, and fine impurities in the mixed water supplied from the polluted soil purification apparatus 100, It can purify. The precipitated fine particles may be dehydrated and then buried in a separate dehydration apparatus, or may be treated through a thermal desorption process.

That is, in the coagulating sedimentation apparatus 30, the mixed water is stored in the coagulating sedimentation tank (not shown), and coagulation and sedimentation of the fine particles can be achieved by administering the flocculating agent. Here, the coagulant is a material that precipitates fine particles suspended in the mixed water by aggregating them together, such as aluminite (Al ₂ SO ₄ ) or ferric chloride (FeCl ₃ ).

Hereinafter, a specific configuration of a contaminated soil purification apparatus according to an embodiment of the present invention will be described.

FIG. 2 is a view illustrating a contaminated soil purifying apparatus according to an embodiment of the present invention, and FIG. 3 is a state diagram showing a flow of mixed water in a contaminated soil purifying apparatus according to an embodiment of the present invention.

2, the polluted soil purification apparatus 100 according to an embodiment of the present invention includes a main body 110, an oil skimmer 120, a transfer unit 130, a rotation unit 140, and a recovery unit 150 ).

Specifically, the main body 110 has a space 111 (see FIG. 1) so as to accommodate mixed water M, more specifically, mixed water M containing fine particles C, coarse particles S, Lt; RTI ID = 0.0 > hopper < / RTI > Here, the fine particles C may include clay, thicker than clay and silt than sand, and coarse particles may contain sand of more than 75 micrometers. . ≪ / RTI >

An inlet 112 into which the mixed water M is introduced may be formed on one side wall of the main body 110 and mixed water M containing fine particles C may be collected on the other side wall of the main body 110 And a discharge port 113 through which the coarse particles S deposited in the main body 110 are discharged may be formed at the bottom of the main body 110. [

For example, when the mixed water M flows into the space 111 of the main body 110 through the inlet 112, oil O may float on the upper side of the main body 110 due to the difference in density, The coarse particles S may be accumulated in the lower part of the main body 110 and the mixed water M containing the fine particles C may be discharged into the recovery port 151 of the main body 110.

A blowing plate 160 and a high-speed impeller 170 may be provided on the inlet 112 side of the main body 110. Here, the perforated plate 160 is spaced apart from the inlet 112 and can guide the agglomerate in the mixed water M in the direction in which the high-speed impeller 170 is located. The high-speed impeller 170 is positioned between the blowing plate 160 and the inlet 112 and rotated at a high speed, so that the coagulum in the mixed water M can be crushed into the coarse particles S.

The oil skimmer 120 is installed on the upper side of the main body 110 in which the oil O floats and can recover the oil O floated in the mixed water M. [ The oil skimmer 120 may be a generally known oil skimmer 120 configuration for recovering oil O. [ The oil O recovered in the oil skimmer 120 may be transferred to a separate post-treatment facility (not shown), and may be recycled through a predetermined post-treatment.

The transfer unit 130 is installed in the discharge port 113 of the main body 110 and can discharge the coarse particles S accumulated in the lower part of the main body 110. For example, the conveying unit 130 includes a conveying duct 133 disposed upwardly sloped from the bottom of the main body 110, and coarse grains S disposed in the conveying duct 133 and stacked on the bottom of the main body 110 in one direction And a driving motor 132 for rotating the conveying screw 131. The conveying screw 131 rotates the conveying screw 131, The coarse particles S transferred by the transferring unit 130 can be transferred to a separate post-processing unit (not shown) by a conveyor belt (not shown) connected to the collecting unit 150.

The conveying screw 131 of the conveying unit 130 is formed to be upwardly inclined from the bottom of the main body 110. However, the present invention is not limited to this, And can be arranged in various forms.

The rotating part 140 may be a low speed impeller positioned above the coarse particles S at the bottom of the main body 110. The rotation unit 140 provides the rotation force for flowing the fine particles C to the mixed water M in the main body 110 so that the fine particles C accumulate in the lower part of the main body 110 over time It can be prevented in advance.

Since the rotary part 140 rotates the mixed water M in the main body 110 at a low speed, the rotating part 140 can smoothly discharge the mixed water M from the discharge port 113 can be prevented from clogging, and as a result, the system can be maintained smoothly.

The recovery unit 150 is configured to recover the mixed water M containing the fine particles C. The recovery unit 150 includes a recovery unit 151 formed on one side wall of the main body 110 for recovering the mixed water M, A partition plate 152 provided on the main body 110 to surround the collection port 151 and providing a recovery flow path 153 between one side walls of the main body 110, Valve 154 as shown in FIG. The boundary plate 152 is separated from the oil O and the mixed water M floating on the upper side of the main body 110 so as to prevent the oil O from being discharged through the collection port 151.

The mixed water M recovered through the recovery unit 150 is separated into water and fine particles C in the coagulating sedimentation apparatus 30 and then water is subjected to post treatment in a separate post treatment facility And the fine particles C may be dehydrated in a separate dehydrating apparatus (not shown) and then buried or treated through a thermal desorption process.

INDUSTRIAL APPLICABILITY As described above, the present invention can have excellent merits such as the ability to quickly separate oil and coarse particles from soil contaminated with oil without clogging the system, and to obtain purified soil effectively.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, a person skilled in the art can change the material, size and the like of each constituent element depending on the application field or can combine or substitute the embodiments in a form not clearly disclosed in the embodiments of the present invention, Of the range. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that such modified embodiments are included in the technical idea described in the claims of the present invention.

10: Screen device 20: Mixing device
30: coagulating sedimentation apparatus 100: contaminated soil purification apparatus
110: main body 111: space
112: inlet 113: outlet
120: Oil skimmer 130: Transfer part
131: conveying screw 132: driving motor
140: rotating part 150:
151: collection port 152: boundary plate
160: Membrane plate 170: High speed impeller

Claims (14)

A contaminated soil purification apparatus for purifying mixed water containing fine particles, coarse particles and oil,
A body for providing a space in which the mixed water is received;
An oil skimmer installed on the upper side of the main body to recover the oil suspended in the main body;
A transfer unit for discharging the coarse particles settled on the bottom of the main body;
A rotating unit for rotating the mixed water in the main body to prevent precipitation of the fine particles;
A recovering unit for recovering mixed water containing the fine particles;
A blowing plate spaced apart from an inlet of the main body into which the mixed water is introduced; And
A high speed impeller positioned between the inlet and the inlet to crush the agglomerates in the mixed water introduced at the inlet;
And a control unit for controlling the control unit. The method according to claim 1,
The rotating part
And a low velocity impeller disposed on the upper side of the coarse particles settled on the bottom of the main body and providing rotation force for flowing the fine particles. The method according to claim 1,
The collecting unit
A recovery means formed on one side wall of the main body; And
And a boundary plate provided on the main body to surround the collection port and providing a collection flow path between one side walls of the main body. The method according to claim 1,
The conveying portion
A delivery screw provided at the bottom of the main body for discharging the coarse particles settled at the bottom of the main body; And
And a driving motor for rotating the conveying screw. delete 5. The method of claim 4,
The conveying screw
And disposed upward at an inclination from the bottom of the main body. The method according to claim 1,
The fine particles
Clay (clay) and a contaminated soil purification apparatus comprising a silt that is thicker than sand and higher than sand. The method according to claim 1,
The coarse particles
Contaminated soil purification equipment containing sand of more than 75 micrometers. A screen device for screening gravel from soil contaminated by oil;
A mixing device for introducing a separating agent for separating oil into the contaminated soil together with the input water to produce mixed water;
A polluted soil purifier for recovering coarse particles and floating oil settled in the mixed water and turning the mixed water to prevent precipitation of fine particles; And
And a coagulating sedimentation apparatus for collecting and collecting fine particles from the coarse particles and the mixed water from which the oil is recovered,
The contaminated soil purification apparatus
A body for providing a space in which the mixed water is received;
An oil skimmer installed on the upper side of the main body to recover the oil suspended in the main body;
A transfer unit for discharging the coarse particles settled on the bottom of the main body;
A rotating unit for rotating the mixed water in the main body to prevent precipitation of the fine particles;
A recovering unit for recovering mixed water containing the fine particles;
A blowing plate spaced apart from an inlet of the main body into which the mixed water is introduced; And
A high speed impeller positioned between the inlet and the inlet to crush the agglomerates in the mixed water introduced at the inlet;
Wherein the system comprises: delete delete 10. The method of claim 9,
The rotating part
And a low velocity impeller which is located on the upper side of the coarse particles settled on the bottom of the main body and provides rotational force for flowing the fine particles. 10. The method of claim 9,
The input number
And is heated to room temperature or higher before being input to the mixing device. 10. The method of claim 9,
The coagulating sedimentation apparatus
And a coagulant is provided in the mixed water to aggregate and precipitate the fine particles in the mixed water.

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