KR101756406B1 - System returning to the original state of oil contaminated soil - Google Patents

Abstract

Field of the Invention The present invention relates to a restoration system for contaminated soil which is cleaned and restored to a large extent over a wide area, and more particularly, to a cleaning system for transferring contaminated soil in a contaminated area to a washing area provided with a washing facility, As well as a system for recovering contaminated soil by transporting the washed soils to a contaminated site again, and to an original recovery system for contaminated soil optimized for restoration of contaminated soil over a wide area.
The contaminated soil recovery system according to the present invention comprises a collection tank installed in a contaminated area and into which a contaminated soil is introduced; A transfer water pump for supplying the transfer water to the collection tank; A first pump for conveying a mixture of contaminated soil and transfer water in the collection tank through a transfer line; A cleaning tank installed in the cleaning area and into which the contaminated soil transferred by the first pump is introduced; Washing means for washing the contaminated soil of the washing tank; A transfer water pump for supplying transfer water to the cleaning tank; And a second pump for transferring the mixture of the cleansing soil washed with the wash tank and the transfer water to the contaminated area through the transfer line.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for recovering contaminated soil,

Field of the Invention The present invention relates to a restoration system for contaminated soil which is cleaned and restored to a large extent over a wide area, and more particularly, to a cleaning system for transferring contaminated soil in a contaminated area to a washing area provided with a washing facility, As well as a system for recovering contaminated soil by transporting the washed soils to a contaminated site again, and to an original recovery system for contaminated soil optimized for restoration of contaminated soil over a wide area.

Soil (soil) is the most important factor in maintaining the global ecosystem, along with water, air, etc., as it provides water and nutrients to the basic producers in the global environment in which humans are alive, It is one of the biological environmental factors.

In addition, the soil plays a diverse role in environmental conservation, such as preventing flooding, cultivating the water source, purifying the water, purifying the pollutants, alleviating the surface temperature and humidity, protecting the soil biomass, and protecting the soil vegetation. It is also an essential element in maintaining human survival

Soil contamination by various pollutants such as dioxins, oil, and other pollutants such as heavy metals causes not only destruction of soil ecosystem but also secondary pollution such as water pollution by ground water and surface water and air pollution by generated gas, And a great deal of cost and effort is required.

The technology of purification and restoration of contaminated soil can be divided into a biological method using microorganisms and plants capable of decomposing and removing soil pollutants, a physical and chemical method using soil washing and pyrolysis, It can be divided into Ex-situ method to install and restore the irrigation irrigation solution, irrigation solution discharge well, irrigation effluent treatment solution, and in-situ method to treat the contaminated soil using various processes .

Generally, the biological soil restoration method uses in-situ method and it is economical because it does not need excavation of contaminated soil. However, it has disadvantages such as low removal rate and efficiency of pollutants, Heat treatment methods such as pyrolysis method and pyrolysis method, which are physical methods in the method, and techniques using copper and microwave are difficult to apply and require high power. Therefore, it is a tendency to use the soil cleaning method which is easy to apply in the field and has a high removal efficiency of the pollutant, in the restoration site of the most contaminated soil at present.

Prior art No. 10-0958747 entitled "Soil cleansing device for restoration of contaminated soil ", Registered patent No. 10-0633111" Soil cleansing device "and the like have been disclosed as prior arts for recovering contaminated soil by using a soil washing technique .

The two registered patents include a washing tank into which a contaminated soil and a washing liquid are injected, an agitator for agitating the contaminated soil and the washing liquid in the washing tank, and an air injector for injecting high pressure air into the washing tank, And high pressure air cleaning.

Both of these patents relate to a cleaning device for cleaning small-scale contaminated soil within a certain area, which is difficult to apply to cleaning large-scale contaminated soil over a wide area.

That is, the above-mentioned two registered patents are installed in a site where contaminated soil exists, and are devices for cleaning the contaminated soil around the contaminated soil. It is difficult in terms of cost and time to take away the contaminated soil from a remote place far away from the cleaning apparatus .

For example, oil-producing nations say that Iraq has destroyed numerous oil facilities as the occupying forces retreated during the civil war, and the oil that was poured from the destroyed oil facilities polluted a wide area around it.

So, the soil of the contaminated area, which has been widely contaminated by crude oil, should be restored to its original state.

Firstly, the cleaning device according to the soil washing technique developed so far has a small processing capacity, which is not enough to wash large-scale contaminated soil over a wide area.

Second, it is conceivable to clean the contaminated soil near the cleaning device by installing a cleaning device in a wide range of contaminated areas. However, in addition to the cleaning device, the water supply facility for supplying cleaning water, the cleaning device and the water supply facility It is practically impossible to install a cleaning device, a water supply facility, and an electric facility in the contaminated areas.

Third, it is possible to consider installing a large-scale washer in one place, bringing a long distance of contaminated soil using a truck such as a truck, washing it, and returning the washed soil back to the contaminated area. However, There is a problem that the labor cost is increased and the dust is scattered during the operation of the transportation vehicle. Especially, in the vicinity of the oilfield, there is no road facility that the transportation vehicle can operate, There is a difficult realistic problem.

A realistic way to restore contaminated soils over a wide area is to make a large-scale washing facility in a certain place, to take away contaminated soil at a remote site, and to wash the washed soil.

However, it is not realistic to use a transportation vehicle to transport contaminated soil and washing water.

The present invention was conceived to solve the problem of recovering contaminated soil over such a wide area due to the fact that the prior art is realistic, and it is an object of the present invention to provide a method of recovering contaminated soil in a contaminated area and washing soil in a washing area, The purpose of this study is to provide a restoration system of contaminated soil which can transport the contaminated soil to the washing area and contaminated area and restore the contaminated soil in a wide area realistically.

In order to achieve the above object, according to the present invention,

A collection tank installed in the contaminated area and into which the contaminated soil is introduced;

A transfer water pump for supplying the transfer water to the collection tank;

A first pump for conveying a mixture of contaminated soil and transfer water in the collection tank through a transfer line;

A cleaning tank installed in the cleaning area and into which the contaminated soil transferred by the first pump is introduced;

Washing means for washing the contaminated soil of the washing tank;

A transfer water pump for supplying transfer water to the cleaning tank;

And a second pump for transferring the mixture of the cleansing soil washed with the wash tank and the transfer water to the contaminated area through the transfer line.

A waste water tank in which waste water generated in the washing tank is stored;

And a purifier for purifying the wastewater from the wastewater tank by flowing the purified wastewater into the washing tank,

And a field tank installed in the washing area and temporarily stored before the contaminated soil and the conveyed water of the mixture of the contaminated soil and the conveyed water conveyed by the first pump are sent to the washing tank and the wastewater tank, respectively Lt; / RTI &

Wherein the cleaning means includes a boiler for supplying hot water and steam to the washing tank,

And the cleaning means further comprises an air compressor for supplying high-pressure air of the cleaning tank.

The restoration system of the contaminated soil according to the present invention constituted as described above does not incur excessive costs of contaminated soil in a polluted area where a road vehicle accessible by a transportation vehicle is not equipped, It is a very useful invention for industrial development as it is a practical and optimized invention to restore contaminated soil in a wide range of polluted areas to the original state.

Brief Description of the Drawings Fig. 1 is a schematic view of a contaminated soil recovery system according to the present invention; Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.

Before describing the present invention in more detail with reference to the drawings,

While the present invention has been described in connection with certain embodiments, it is obvious that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. It is to be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but on the contrary, is intended to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

In the drawings, the same reference numerals are used for the same reference numerals, and in particular, the digits of the tens and the digits of the digits, the digits of the digits, the digits of the digits and the alphabets are the same, Members referred to by reference numerals can be identified as members corresponding to these standards.

In the drawings, the components are expressed by exaggeratingly larger (or thicker) or smaller (or thinner) in size or thickness in consideration of the convenience of understanding, etc. However, It should not be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the term " comprising " or " consisting of ", or the like, refers to the presence of a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

As shown in the figure, the contaminated soil recovery system according to the present invention includes a first field tank 110, a collecting tank 120, a transfer water pump 130, a first pump 140, A cleaning tank 220, a cleaning means, a conveyance water pump stage 230, a second pump 240, a wastewater tank 260, a purifier 270, and a second jet tank 210, A conveyance line 10 connecting the collecting tank 120 and the second field tank 210 and a conveying line 20 connecting the washing tank 220 and the first field tank 110 to each other.

First, the collecting tank 120, the feed water pump 130, the first pump 140, the first jet tank 110, the water tank 150, and the like installed in the contaminated area will be described.

The collection tank 120 is installed in a contaminated area and receives the contaminated soil from the heavy equipment such as a bulldozer and a crane, and receives the conveyed water as a medium for transporting the contaminated soil to the washing area.

The collection tank 120 may be made of an impermeable material (e.g., vinyl) so as to facilitate the pouring or demolishing of concrete after the puddle of a certain scale (e.g., width * length * height = 10m * 10m * 2m) Can be used to construct the inner wall. The same applies to the cleaning tank 220.

It is preferable that the collecting tank 120 is provided with an agitator 160 for agitating the contaminated soil so that the contaminated soil is mixed with the transfer water.

In addition, it is preferable that the transferring water is actively mixed with the contaminated soil while being discharged onto the contaminated soil, and the contaminated soil discharged from the bottom of the collecting tank 120 is floated up and mixed.

The feed water pump 130 feeds the feed water as a medium for transporting the contaminated soil to the collection tank 120.

The first pump 140 connects the collecting tank 120 of the contaminated area and the second field tank 210 of the washing area to the transfer line 10 for providing a flow path through which the mixture of the contaminated soil and the transfer water is transferred ) To transfer the mixture of the contaminated soil and the conveyed water to the washing area.

The first pump 140 (including the second pump 240 in the wash area) uses a centrifugal pump of the high lift. That is, instead of using a general pump that sucks the medium to the destination by pumping force and sends it to the destination, the centrifugal pump that rotates the medium introduced by the impeller rotating inside and pushes out the medium introduced by the centrifugal force to the destination, use. As the inner medium is pushed out of the centrifugal pump, the external medium continues to flow into the interior due to the vacuum pressure.

It is not easy to send a mixture of contaminated soil and transfer water to the wash area as a general pump that sucks the medium with the pumping power, but the centrifugal pump can do this. In addition, the centrifugal force pump is a method in which the medium is pushed outward by a centrifugal force, which is advantageous to prevent the impeller from being damaged due to the gravel contained in the influent medium (i.e., a mixture of contaminated soil and transfer water).

It is preferable that the first pump 140 receives the mixture of the contaminated soil and the transfer water from the upper side of the collection tank 120 so that the bulky gravel which is difficult to transfer is not introduced. That is, the heavy soil gravel is bulky on the contaminated soil so that it does not flow into the first pump 140 on the bottom of the collecting tank 120 and is stirred with the conveyed water by the stirrer to collect the soil, sand, The first pump 140 is disposed on the upper side of the collection tank 120 so that only contaminants such as crude oil can flow into the first pump 140, ). ≪ / RTI >

The first jet tank (110) is filled with a mixture of wash water and transfer water coming from the wash area.

The first wetness tank 110 may be constructed in such a manner that a washing structure having a flat structure piled up in the upper part of a puddle structure having a structure in which the washed washing toilets are piled up is moved to the original position ). That is, the discharge port through which the cleansing soil and the transportation water are discharged is set high, and a first field tank 110 having a flat structure is installed thereunder.

Since the transported water to be supplied to the first field tank 110 is to be fed back to the transfer water of the collecting tank 120, impermeable material is buried in the bottom of the first field tank 110, Do not let it penetrate.

The storage tank 150 receives and stores the transportation water introduced into the first field tank 110 and supplies the stored transportation water to the collection tank 120 through the transfer water pump 130.

The first wetness tank 110 and the water storage tank 150 are connected to each other at a gentle slope so that the transported water of the first wetness tank 110 flows naturally into the water storage tank 150. In a middle step, So that the soil and sand mixed with the flowing water can be settled in the settling tank so that clean transported water can be introduced into the water storage tank 150.

Hereinafter, the second field tank 210, the cleaning tank 220, the cleaning means, the transport water pump stage 230, the second pump 240, the wastewater tank 260, the purifier 270, .

A mixture of the contaminated soil and the transfer water, which is transferred through the transfer line 10 by driving the first pump 140, is charged into the second field tank 210.

It is preferable that the second field tank 210 also has a flat structure such that a heavy equipment such as a fork crane and a bulldozer can work as in the first field tank 110. In order to prevent inflow of the introduced mixture into the underground, It may be preferable that an impermeable material is embedded. In addition, it is preferable that the second jet tank 210 has an inclined structure toward the wastewater tank 260 so that the introduced transfer water naturally flows over and flows into the wastewater tank 260.

The contaminated soil accumulated in the second jet tank 210 is introduced into the washing tank 220, and the contaminated soil is cleaned.

The contaminated soil in the second field tank 210 may be transferred to the washing tank 220 using a heavy equipment such as a fork and a bulldozer and may be introduced into the washing tank 220 from the second field tank 210 using a centrifugal force pump. Lt; / RTI > When the centrifugal force pump is used, the second jet tank 210 should have a puddle structure instead of a flat structure, and water must be separately supplied to prevent the shortage of water as a transport medium. At this time, it may be preferable to inject warm water so that contaminants attached to the contaminated soil easily dissolve and overflow in the second field tank 210 and flow to the waste water tank 260.

The cleaning means cleans the contaminated soil introduced into the cleaning tank 220.

The washing means includes a carrier water pump stage 230 for charging clean washing water into the washing tank 220 and hot water and high temperature and high pressure steam to the contaminated soil of the washing tank 220, An air compressor 300 for spraying high-pressure air to the contaminated soil so that contaminants can be removed from the contaminated soil, and an air compressor 300 for discharging contaminants from the contaminated soil, And an agitator 280 for agitating the mixture.

High temperature hot water, high temperature, high pressure steam and high pressure air will be advantageous in that the discharge from the bottom of the washing tank 220 will dissolve the pollutants away from the contaminated soil and dissolve in the running water.

The contaminants dissolved in the carrier water off the contaminated soil by the cleaning means are discharged together with the continuous introduction of the carrier water when the carrier water overflows the washing tank 220. The discharged carrier water and contaminants are discharged to the waste water tank 260 ).

If the contaminated soil is not mixed with the transportation water on the upper side of the washing tank 220 or is small enough to be tolerated, the second pump 240 is operated And transports the washed laundry soil to the first jet tank 110 in the contaminated area. The driving method of the second pump 240 is the same as the driving method of the first pump 140 described above. Briefly, the second pump 240, as a centrifugal force pump, conveys a mixture of the carrier water and the cleansing soil in a pushing manner to a contaminated area several kilometers away through the pipe of the carrier line 20.

In the contaminated area, the contaminated soil is continuously transported to the washing area. However, the washing area is not cleaned and the washing soil is not continuously transported to the contaminated area. Accordingly, a plurality of washing tanks 220 are provided in the washing area, so that while the washing operation is being performed in any of the washing tanks 220, the washing tanks 220 are operated to carry the washing soil, It is desirable to make the speed equal so that the restoration work of the contaminated soil is continuously performed without interruption. In the case where a plurality of the cleaning tanks 220 are provided, the second pump 240 may be connected to each of the cleaning tanks 220 through the branch pipe equipped with the opening / closing valves, The washing soil can be continuously conveyed to the contaminated area by the line 20. [

The wastewater tank 260 is connected to the wastewater (transportation water and contaminants mixed therewith) flowing over from the second wetness tank 210 and wastewater (transportation water and contaminants) Is stored.

The purifier 270 receives the wastewater from the wastewater tank 260 and separates the purified wastewater into purified water, refined oil, solid waste, and the like.

The purified and purified oil is discharged to an oil tank and recycled. The purified water is discharged to the purified water tank 250 and used as transportation water to be supplied to the washing tank 220, and the solid waste is disposed of by incineration or landfill .

In the present invention, the contaminated soil in a contaminated area remote from the centrifugal force pump (that is, the first pump 140 and the second pump 240) is transported to the cleaning area at a distance of several km or more, It is a technique to recover contaminated soil by transporting it to a contaminated area. It constantly needs water (that is, conveyed water and conveyed water) as medium for conveying contaminated soil and washing water.

However, since the present invention is continuously used water is circulated through the polluted area and the washing area, so that a large amount of water is not used. Even if there is no water supply facility in the contaminated area, water in the washing area is supplied to the contaminated area. Restoration of the soil is possible.

While the invention has been shown and described with reference to the specific embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. And should be construed as falling within the scope of protection of the present invention.

10: conveying line 20: conveying line
110: first jet tank 120: collection tank
130: feed water pump 140: first pump
150: Water tank 160: Stirrer
210: second jet tank 220: cleaning tank
230: Carrier water pump 240: Second pump
250: Purified water tank 260: Wastewater tank
270: purifier 280: stirrer
290: boiler 300: air compressor

Claims (5)

A collection tank installed in the contaminated area and into which the contaminated soil is introduced;
A transfer water pump for supplying the transfer water to the collection tank;
A first pump for conveying a mixture of contaminated soil and transfer water in the collection tank through a transfer line;
A cleaning tank installed in the cleaning area and into which the contaminated soil transferred by the first pump is introduced;
Washing means for washing the contaminated soil of the washing tank;
A transfer water pump for supplying transfer water to the cleaning tank;
And a second pump for transferring the mixture of washed soil and transported water washed in the wash tank to a contaminated area through a conveying line. The method according to claim 1,
A waste water tank in which waste water generated in the washing tank is stored;
Further comprising a purifier for purifying wastewater from the wastewater tank by flowing the purified wastewater into the washing tank, and supplying purified water to the washing tank as the washing water. 3. The method of claim 2,
And a field tank installed in the washing area and temporarily stored before the contaminated soil and the conveyed water of the mixture of the contaminated soil and the conveyed water conveyed by the first pump are sent to the washing tank and the wastewater tank, respectively Of soil contaminated soil. 4. The method according to any one of claims 1 to 3,
Wherein the cleaning means comprises a boiler for supplying hot water and steam to the wash tank. 5. The method of claim 4,
Wherein the cleaning means further comprises an air compressor for supplying high pressure air of the wash tank.

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