KR102338100B1 - Apparatus for remediating fine soil particle - Google Patents

Abstract

An apparatus for purifying fine soil using cavitation is disclosed.
According to an embodiment of the present invention, a reservoir tank for storing water-containing contaminated soil with oil contaminants attached to the fine soil; an inlet pipe connected to one side of the reservoir tank to receive the water-containing contaminated soil; a venturi unit connected to the inlet pipe to receive the water-containing contaminated soil and configured to have a structure in which a cross-sectional area of an internal passage through which the water-containing contaminated soil passes is narrowed and then expanded to separate fine soil and oil contaminants from the water-containing contaminated soil; and a discharge pipe connected to the venturi unit and supplying the fine earth separated from the venturi unit and the oil contaminants to the reservoir tank; a fine earth purification apparatus using cavitation may be provided.

Description

Fine soil purification device using cavitation {APPARATUS FOR REMEDIATING FINE SOIL PARTICLE}

The present invention relates to an apparatus for purifying fine soil using cavitation.

Although today's industry has been developed almost entirely on the basis of fossil fuels, the environmental pollution problem accompanying the development of industry has recently emerged as a serious social problem.

The environmental pollution as described above can be largely divided into air pollution, water pollution, and soil pollution. In particular, the soil pollution problem poses a very serious threat to food production, and not only causes water pollution through groundwater pollution, but is also difficult to solve compared to air pollution or water pollution.

On the other hand, among fossil fuels, oil such as petroleum can be used in various industrial fields and is widely used. This can cause serious soil contamination.

Since it takes a considerable period of time for soil contaminated with oil to naturally recover, interest in technologies for artificially remediing soil contaminated with oil is increasing.

As existing methods for purifying soil contaminated by oil, technologies such as soil washing, thermal desorption, and bio remedation have been proposed.

Looking at the above techniques in detail, soil washing is a technique for separating contaminants from the surface of the soil using water or a surfactant.

This soil washing method has a problem in that the consumption of surfactant becomes uneconomically excessive when treating soil contaminated with heavy oil or crude oil, and when water comes into contact with heavy oil or crude oil, tar balls are generated There is a problem in that the screen is clogged by the tar ball or the contact area of the surfactant is reduced, so that the treatment effect is rapidly reduced.

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

When this thermal desorption method incinerates the contaminants volatilized from the contaminated soil, oxygen amount is required in proportion to the carbon number of the contaminants. If the causative agent of soil contamination is light oil with a relatively low carbon number, there is no problem when purifying by thermal desorption method. The amount of oxygen required is also very large, and since a bag filter must be increased in proportion to this, there is a problem in that the post-treatment facility becomes very excessive.

Bio remedation is a purification technology using microorganisms, and according to the US EPA, it is generally possible to treat up to 5,000 mg/kg of TPH, and in the case of soil contaminated with heavy oil or crude oil, TPH is much higher than 5,000 mg/kg Since it is generally exceeded, there is a problem that there is a limit to the treatment by microorganisms. Here, TPH is an abbreviation of Total Petroleum Hydrocarbon, which means total petroleum hydrocarbons, and the higher the TPH value, the more serious the soil contamination level is.

In addition, when soil contaminated with crude oil is left for several decades, all light oil components with a relatively low carbon number contained in crude oil are blown away, leaving only difficult-to-decompose heavy oil components, resulting in biological decomposition. It can be difficult, and in a dry and strong sunlight environment, it is practically difficult to supply moisture and breathability necessary for microorganisms, so there is a limitation in that it is difficult to apply the bioremediation process.

An embodiment of the present invention is to provide an apparatus for purifying fine soil using cavitation that can effectively separate oil contaminants from fine soil by using a cavitation phenomenon in fine soil contaminated with oil or the like.

According to an embodiment of the present invention, a reservoir tank for storing water-containing contaminated soil with oil contaminants attached to the fine soil; an inlet pipe connected to one side of the reservoir tank to receive the water-containing contaminated soil; a venturi unit connected to the inlet pipe to receive the water-containing contaminated soil, and has a structure in which a cross-sectional area of an internal passage through which the water-containing contaminated soil passes is narrowed and then expanded to separate fine soil and oil contaminants from the water-containing contaminated soil; and a discharge pipe connected to the venturi unit and supplying the fine earth separated from the venturi unit and the oil contaminants to the reservoir tank; a fine earth purification apparatus using cavitation may be provided.

In addition, it is provided in the inlet pipe, it may further include a transfer pump for transferring the water-containing contaminated soil to the venturi unit.

In addition, the inlet pipe may further include a bypass pipe for bypassing the over-supplied water-containing contaminated soil from the rear end of the transfer pump toward the front end of the transfer pump.

In addition, a separation line connected to the upper part of the reservoir tank and configured to form a layer on the upper part of the reservoir tank and discharging the separated oil contaminants to the outside of the reservoir tank may be further included.

In addition, the venturi unit, a plurality of venturi pipes provided between the inlet pipe and the discharge pipe, each of which has a narrow cross-sectional area of the inner passage and is formed in a structure to expand; and a housing enclosing and covering the plurality of venturi tubes.

In addition, the reservoir tank, the inlet pipe, the venturi unit, and the discharge pipe may be provided as a single unit module, and when a plurality of the unit modules are provided, the reservoir tanks may be arranged to be adjacently connected to each other.

In addition, openings may be formed in the plurality of reservoir tanks at a lower portion of the partition wall forming the interface so that the water-containing contaminants can move to other adjacent reservoir tanks.

In addition, the separation line may be respectively connected to upper portions of the plurality of reservoir tanks.

In addition, the unit module may be disposed in a post-process of the desilter to purify the fine soil that has not been purified in the desilter.

According to the embodiment according to the present invention, fine soil purification efficiency of fine soil is improved because oil pollutants can be separated and recovered from fine soil contaminated with oil and the like, using cavitation phenomenon through a simple venturi structure. has an increasing effect.

1 is a side view schematically illustrating an apparatus for purifying fine soil using cavitation according to an embodiment of the present invention.
2 is a plan view showing another embodiment of the venturi unit in the apparatus for purifying fine soil using cavitation according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view taken along line AA of FIG. 2 .
4 is a view showing a state in which a plurality of basic modules are provided by using the fine soil purification apparatus of FIG. 1 as one basic module.

Hereinafter, with reference to the accompanying drawings, the configuration and operation according to the embodiment of the present invention will be described in detail. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following description is one of several aspects of the present invention that is claimable, and the following description may form a part of the detailed description of the present invention.

However, in describing the present invention, detailed descriptions of known configurations or functions may be omitted for clarity of the present invention.

Since the present invention may include various changes and may include various embodiments, specific embodiments will be illustrated in the drawings and described in the detailed description. However, this is not intended to limit the present invention to specific embodiments, and it should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various components, but the components are not limited by these terms. These terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being 'connected' or 'connected' to another component, it is understood that it may be directly connected or connected to the other component, but other components may exist in between. it should be

The terms used in the present application are only used to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1 , the fine soil purification apparatus 10 using cavitation according to an embodiment of the present invention includes a reservoir tank 100 , an inlet pipe 200 , a venturi unit 300 and an exhaust pipe 400 . can

In the fine soil purification apparatus 10 using cavitation according to an embodiment of the present invention, cavitation (cavitation phenomenon) in fine soil particles (hereinafter referred to as "microsetto") whose surface is surrounded by oil contaminants (eg, spilled oil) ) to separate oil pollutants and purify fine soil.

In general, in soil contaminated with oil contaminants, most soils with a particle size of 10 μm or more are cleaned cleanly, whereas fine soil with a smaller particle size is too small to transmit physical force. It is difficult to purify fine soil because the combination of oil pollutants and soil particles acts not only as an adhesive force but also as an electrical force.

One embodiment of the present invention is an apparatus for purifying fine soil, which is difficult to remove oil contaminants as described above, using hydrodynamic cavitation (cavitation).

The device according to an embodiment of the present invention allows the fine soil (hereinafter, referred to as "water-contaminated soil") containing oil contaminants to be attached to the fine soil and containing predetermined water to pass through the venturi structure whose cross-sectional area is rapidly reduced. .

When water-containing contaminated soil passes through the venturi structure, cavitation occurs as the flow rate increases and the pressure decreases, and then disappears when the cross-sectional area is expanded. It is possible.

Referring to FIG. 1 , the reservoir tank 100 is provided to store water-containing contaminated soil with oil contaminants attached to the fine soil.

The reservoir tank 100 may be formed to have an open upper portion, and a lower portion may be formed in a flat or concave hopper structure if necessary. The size of the reservoir tank 100 may be set to correspond to the treatment capacity of the water-containing contaminated soil, and a plurality of two or more may be provided as needed.

In addition, the inlet pipe 200 is connected to one side of the reservoir tank 100 and is provided to receive the water-containing contaminated soil stored in the reservoir tank 100 . The inlet pipe 200 may be connected to the lower side of the reservoir tank 100 so that the hydrated contaminated water can be easily supplied.

In addition, the venturi unit 300 may be detachably connected to the inlet pipe 200 to receive water-containing contaminated soil from the inlet pipe 200 .

As shown in FIG. 1, the venturi unit 300 has a structure (venturi structure) in which the cross-sectional area of the internal passage through which the water-containing contaminated soil passes is narrowed and then expanded again (Venturi structure). can be purified The configuration, structure, and purification principle of the fine soil of the venturi unit 300 will be described later.

In addition, the discharge pipe 400 is connected to the rear end of the venturi unit 300, passes through the venturi unit 300, and then receives the fine soil and oil contaminants separated from the hydrous contaminated soil, and it is supplied to the reservoir tank 100. . Accordingly, the fine soil and oil contaminants discharged from the venturi unit 300 may be introduced into the reservoir tank 100 .

In addition, an embodiment of the present invention may further include a transfer pump 500 in addition to the reservoir tank 100 , the inlet pipe 200 , the venturi unit 300 and the discharge pipe 400 .

The transfer pump 500 may be installed in the inlet pipe 200 as shown in FIG. 1 to transfer the water-contaminated soil to the venturi unit 300 . The transfer pump 500 may suck in the water-containing contaminated soil of the reservoir tank 100 at a predetermined pressure (eg, 10 to 20 bar) and supply the water-containing contaminated soil to the venturi unit 300 .

In addition, the inlet pipe 200 may further include a bypass pipe 210 as necessary as shown in FIG. 1 . The bypass pipe 210 may be provided to connect one side and the other side of the inflow pipe 200 to each other.

Specifically, the bypass pipe 210 connects the portion forming the rear end of the transfer pump 500 and the portion forming the front end of the transfer pump 500 in the inlet pipe 200 to the rear end of the transfer pump 500 . It is possible to bypass the over-supplied hydrated contaminated soil to the front end of the transfer pump 500 .

Therefore, the water-containing contaminated soil supplied to the venturi unit 300 by the transfer pump 500 in the inlet pipe 200 is the front end of the transfer pump 500 through the bypass pipe 210 if the amount of the water-containing contaminated soil is excessive. Since it is sent to the side, the amount of water-containing contaminated soil supplied to the venturi unit 300 may be kept constant.

In addition, as shown in FIG. 1 , an embodiment of the present invention may further include a separation line 600 .

The separation line 600 is connected to the upper part of the reservoir tank 100 , and may suck in the oil contaminants separated by forming a layer on the upper part of the reservoir tank 100 and discharge them to the outside of the reservoir tank 100 .

As the water-containing contaminated soil passes through the venturi unit 300 , oil contaminants attached to the fine soil are separated by cavitation, and the oil contaminants and the fine soil enter the reservoir tank 100 again through the discharge pipe 400 . In this process, the oil contaminants, fine soil, and moisture once separated have different specific gravity, so layer separation occurs in the reservoir tank 100 .

At this time, the oil contaminants having the smallest specific gravity and not mixing with water because they contain oil components are separated into layers in the reservoir tank 100 and located on the uppermost layer. (100) When discharged to the outside, oil contaminants may be removed from the reservoir tank 100 .

Hereinafter, the venturi unit 300 will be described in detail.

The venturi unit 300 is configured to purify the water-containing contaminated soil by using cavitation (hydrodynamic cavitation) that occurs when the contaminated water-containing contaminated soil passes through a structure having a reduced cross-sectional area.

When the water-contaminated soil passes through the portion where the cross-sectional area is narrowed in the venturi unit 300, when the speed of the fluid increases, the pressure in the fluid is locally lowered to less than the saturated vapor pressure of the liquid. At this time, in the fluid, it does not react with water molecules A group of cavitation bubbles composed of axial gas molecules is generated.

In addition, when the water-contaminated soil passes through the portion where the cross-sectional area is expanded again in the venturi unit 300, when the flow rate is reduced and the pressure is restored, each cavitation bubble undergoes the processes of contraction, re-expansion, and collapse to reduce the impact pressure and high temperature environment. It is formed in the vicinity of the bubble.

At the same time, micro jets are generated in the collapsing bubbles, and water molecules are decomposed into OH radicals and H radicals by thermal decomposition. It oxidizes, decomposes, erodes, and cuts to purify the contaminated fine soil.

As shown in FIG. 1 , the venturi unit 300 performing the above operation may have a single tube structure in which the cross-sectional area of the internal passage is narrowed and then expanded.

In addition, if there is a large amount of water-contaminated soil to be purified, a plurality of pipes may be provided as needed in order to quickly process it.

2 and 3 , the venturi unit 300 may be provided to include a plurality of venturi tubes 310 and a housing 320 .

A plurality of venturi pipes 310 may be provided in parallel between the inlet pipe 200 and the outlet pipe 400 in plurality. The plurality of venturi tubes 310 may be formed in a structure in which the cross-sectional area of the internal passage is narrowed and then expanded again.

Therefore, the water-containing contaminated soil provided from the inlet pipe 200 may be divided into a plurality of venturi pipes 310 and supplied, respectively, and the water-containing contaminated soil may be subjected to changes in flow rate and pressure while passing through each venturi pipe 310 . After separation into fine soil and oil contaminants by cavitation generated by the

In addition, the housing 320 may cover the plurality of venturi tubes 310 to protect the venturi tubes 310 from external impact.

In addition, referring to FIG. 4 , another embodiment of the present invention includes the reservoir tank 100 , the inlet pipe 200 , the venturi unit 300 and the discharge pipe 400 as described above. It may be provided to use the fine soil purification apparatus 10 according to the present invention as one unit module 10, and to connect these unit modules 10 to each other as needed.

When two or more unit modules 10 are provided in plurality, the reservoir tanks 100 are arranged to be adjacent to each other as shown in FIG. 4 . 4 exemplarily shows a case in which four unit modules 10 are provided. In this case, four reservoir tanks 100 may be provided.

In addition, an opening 111 of a predetermined size is formed in the lower portion of the partition wall 110 forming the interface between the reservoir tanks 100 so that the water-containing contaminants stored in the reservoir tank 100 can move to another adjacent reservoir tank 100 . can be

In addition, when provided as a plurality of unit modules 10 as described above, the separation line 600 is respectively connected to the upper portions of the plurality of reservoir tanks 100 to discharge the oil pollutants separated into layers to the outside of the reservoir tank 100 . can do. In addition, the separation line 600 may be connected to the oil-water separator 610 to separate water and oil from oil contaminants through the oil-water separator 610 .

In addition, the unit module 10 may be disposed on the rear side of the desilter 20 to purify the fine soil of about 10 μm or less that has not been purified in the desilter 20 .

The desilter 20 is a device provided to separate soil particles and oil components in the soil purification process, but in the case of fine soil, oil contaminants are not easily separated from the fine soil as described above, so the unit module 10 is a desilter ( 20) can be disposed in the post-process to purify fine soil.

As mentioned above, although the present invention has been described using preferred embodiments, the scope of the present invention is not limited to the specific embodiments described, and those of ordinary skill in the art may freely within the scope of the present invention. Substitution and change of components are possible, which also belongs to the right of the present invention.

10: fine soil purification device (unit module) 20: desilter
100: reservoir tank 110: bulkhead
111: opening 200: inlet pipe
210: bypass pipe 300: venturi unit
310: venturi tube 320: housing
400: discharge pipe 500: transfer pump
600: separation line 610: oil-water separator

Claims (8)

Reservoir tank for storing water-contaminated soil with oil contaminants attached to fine soil;
an inlet pipe connected to one side of the reservoir tank to receive the water-containing contaminated soil;
a venturi unit connected to the inlet pipe to receive the water-containing contaminated soil and configured to have a structure in which a cross-sectional area of an internal passage through which the water-containing contaminated soil passes is narrowed and then expanded to separate fine soil and oil contaminants from the water-containing contaminated soil;
a discharge pipe connected to the venturi unit and supplying the fine soil and the oil contaminants separated from the venturi unit to the reservoir tank;
It is disposed adjacent to the upper surface of the water-containing contaminated soil accommodated in the reservoir tank, and the oil contaminants separated from the venturi unit are separated from the fine soil in the reservoir tank to form a layer on the upper part of the reservoir tank. a separation line for discharging to the outside of the reservoir tank; and
It is provided in the inlet pipe, including a transfer pump for transferring the water-containing contaminated soil to the venturi unit,
The reservoir tank, the inlet pipe, the venturi unit and the discharge pipe are provided as one unit module, and the unit modules are provided in plurality,
The lower portions of the plurality of reservoir tanks have a hopper shape in which the cross-sectional area in the horizontal direction decreases toward the lower side,
An opening is formed in a plurality of the reservoir tanks so that the water-contaminated soil can move to another adjacent reservoir tank,
The opening is formed above the hopper shape,
The venturi unit is
A plurality of venturi pipes are provided between the inlet pipe and the outlet pipe, and the cross-sectional area of each internal passage is narrowed and then expanded.
The area of the end of the inlet pipe connected to the venturi unit is greater than the sum of the areas of the inlet end of the plurality of venturi tubes, and the area of the end of the outlet pipe connected to the venturi unit is the area of the outlet end of the plurality of venturi tubes greater than the sum of
The inlet pipe is
By connecting the portion forming the rear end of the transfer pump and the portion forming the front end of the transfer pump in the inlet pipe, the over-supplied hydrated contaminated soil from the rear end of the transfer pump to the front end of the transfer pump is bypassed. Containing a bypass pipe for maintaining a constant amount of the water-containing contaminated soil supplied to the venturi unit,
Fine soil purification device using cavitation. delete delete delete The method of claim 1,
The venturi unit is
Further comprising a housing covering the plurality of venturi tubes,
Fine soil purification device using cavitation. 6. The method according to any one of claims 1 to 5,
When the unit modules are provided in plurality, the reservoir tanks are arranged to be connected to each other next to each other,
Fine soil purification device using cavitation. The method of claim 1,
The opening is formed under a partition wall forming an interface between a plurality of the reservoir tanks,
Fine soil purification device using cavitation. The method of claim 1,
The unit module is disposed in a post-process of the desilter to purify the fine soil that has not been purified in the desilter,
Fine soil purification device using cavitation.

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