KR20020091479A - Purification apparatus and method for contaminated soil by electron beam irradiation - Google Patents

Abstract

PURPOSE: An apparatus and a method for purifying contaminated soil by electron beam irradiation are provided to oxidize recalcitrant organic matter in soil so that the contaminated soil is promptly purified by irradiating accelerated electron beam onto excavated soil so that radicals having high reactivity are rapidly produced. CONSTITUTION: The apparatus for purifying contaminated soil by electron beam irradiation comprises a main body frame(110) in which a certain space is formed, at one side of the lower part of which a discharge port(110a) is formed; a hopper(111) which is mounted on one side of the upper part of the main body frame(110), on the upper part of which an opening part(111a) for injecting contaminated soil is formed, and at the lower part of which a soil supply hole(111b) for supplying the soil injected(10) is formed; a conveyor(113) which is mounted on the lower part of the soil supply hole(111b) of the hopper(111) to transfer soil supplied from the hopper(111); an electron beam accelerator(120) which is mounted on the main body frame(110) in a way that the electron beam accelerator(120) is oppositely directed to the upper surface of the conveyor(113), and which irradiates electron beam onto the soil transferred; and a power supply(130) which is mounted on one side of the main body frame(110) to supply power to the conveyor(113) and the electron beam accelerator(120), wherein the conveyor(113) comprises a plural transfer rolls(112), a transfer belt(114), and a plural projecting members(114a).

Description

Polluted soil purification apparatus and method by electron beam irradiation {PURIFICATION APPARATUS AND METHOD FOR CONTAMINATED SOIL BY ELECTRON BEAM IRRADIATION}

The present invention relates to an apparatus and method for on-site purification of contaminated soil, and more particularly, by excavating and collecting soil contaminated by hardly decomposable organic matter and irradiating the collected soil with electrons accelerated by an electron beam accelerator. In addition, the present invention relates to an apparatus and method for purifying contaminated soil by electron beam irradiation, which enables rapid generation of radicals having high reactivity, thereby enabling rapid oxidation of hardly decomposable organic substances in soil.

In general, existing soil purification projects have been focused on the purification of heavy metal contamination in mining areas and nuclear waste treatment areas. However, in recent years, the hard-decomposable organic compound pollution called so-called high-tech pollution caused by organic chlorine compounds used in semiconductor factories, dry cleaning, coating processes, etc. has become an important problem.

As a conventional method for purifying soil contaminated by such organic compounds, a low temperature thermal desorption method, a thermal decomposition method, a soil washing method, a soil vapor extraction method, and the like are used.

The low temperature thermal desorption method is a physical separation process, the contaminated soil is heated to 90 to 320 ℃ without decomposing the organic material to volatilize the moisture and organic material and then transferred to the gas treatment device, the treated soil is The microorganism is buried again in the drilling site through the activation process, which is limited to volatile organic materials, requires separate energy to remove moisture from the soil, and has a problem of secondary treatment of volatilized organic materials.

The pyrolysis method is a chemical desorption method that decomposes organic substances by heat in an anaerobic state without oxygen, and heats contaminated soil to separate gaseous volatile contaminants from the soil, and nonvolatile contaminants are combined with the soil. It is a method to solidify and slag. The pyrolysis method can be applied to complex contaminated soil, and has the advantage of removing pollutants within a relatively short time, but requires a facility for recovering and treating the volatilized volatilization during heating, and slag nonvolatile There is a problem in that the material must be transported to landfill.

The soil washing method uses a suitable cleaning agent such as water, a surfactant, an alkali cleaner, etc. to separate the contaminating organics and heavy metals from the soil particles by weakening the surface tension of the harmful contaminating organic matter bound to the soil particles or changing the heavy metal into a liquid phase. As a method for treating the soil, there is a problem in that the post-treatment for the separated contaminants and the soil cleaner and the micro soil is required.

In addition, the steam extraction method is a method of distilling contaminants by extracting contaminants by installing a vacuum extraction pipe network in the inside and vacuuming while leaving contaminated soil left on the ground. This has the advantage that the leachate can be collected and easy to monitor, but has to deal with the exhaust gas, the time required for restoration, there is a problem that requires a large space for the performance of the process.

In addition, there are many types of soil purification methods, but most of them require secondary treatment, and there is a cost and economic burden for transporting the excavated contaminated soil to the treatment plant or reclaiming soil that has lost its function as a soil after purification. There is a problem that must be done.

Accordingly, the present invention has been made to solve the above problems, and excavated and collected contaminated soil, and irradiated electron beam accelerated by the electron beam accelerator to the collected soil radicals highly reactive from moisture contained in the soil It is an object of the present invention to provide an apparatus and a method for purifying contaminated soil by electron beam irradiation, by allowing the rapid generation of oxidized hardly decomposable organic matter in the soil to quickly purify contaminated soil.

Figure 1 is a side view schematically showing the configuration of one embodiment of the contaminated soil purification apparatus by electron beam irradiation according to the present invention.

Figure 2 is a state diagram showing the operating state of the contaminated soil purification apparatus by electron beam irradiation in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

10: soil 110: body frame

110a: outlet 111: hopper

112: feed roller 113: conveyor

114: conveying belt 120: electron beam accelerator

130: power supply

In order to achieve the above object, the device of the present invention has a predetermined space formed therein, and is provided with an inlet for injecting contaminated soil on one side thereof, and an outlet for discharging the treated soil on the other side. main body; A conveying means provided at a lower portion of the inlet of the main body and transferring the injected soil from the inlet to the outlet; An electron beam accelerator mounted on the main body so as to face the upper surface of the conveying means, and irradiating the electron beam to the transported soil to form highly reactive radicals in the soil to oxidatively decompose pollutants; And it is provided on one side of the main body, and provides a polluted soil purification apparatus by electron beam irradiation including a power supply means for supplying power to the transfer means and the electron beam accelerator.

In addition, the method of the present invention comprises the first step of excavating the contaminated soil into the hopper of the main body; A second step of supplying and transporting soil on a conveyor installed in the main body; Irradiating the accelerated electron beam to the transported contaminated soil to oxidize contaminants; And a fourth step of discharging the soil in which the pollutants are oxidized.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a side view schematically showing the configuration of one embodiment of a soil contaminant purification apparatus by electron beam irradiation according to the present invention.

As shown in FIG. 1, the apparatus for purifying contaminated soil by electron beam irradiation according to the present embodiment includes a main frame 110 having a predetermined space formed therein and an outlet 110a formed at one side thereof; An opening 111a is mounted on the upper side of the main body frame 110, and an opening 111a for injecting contaminated soil is formed therein, and a soil supply hole 111b for supplying the soil 10 inserted in the lower portion thereof. A formed hopper 111; A conveyor 113 mounted at a lower portion of the soil supply hole 111b of the hopper 111 to transfer soil supplied from the hopper 111; An electron beam accelerator (120) mounted to the main body frame (110) so as to face the upper surface of the conveyor (113) and irradiating an electron beam to the soil to be transported; It is composed of a power supply 130 mounted on one side of the main body frame 110 to supply power to the conveyor 113 and the electron beam accelerator (120).

Here, the conveyor 113 includes a plurality of feed rollers 112 that are rotated by the power supplied from the power supply 130; A transfer belt 114 mounted to the plurality of transfer rollers 112 externally and transferring soil contaminated by the rotation of the transfer rollers 112 to an outlet 110a; It is formed on the outer surface of the conveying belt 114 in a direction orthogonal to the conveying direction is composed of a plurality of protruding members (114a) to facilitate the transfer of the soil.

In addition, although not shown, guide members are provided on both sides of the conveyance direction of the conveyance belt 114 to prevent the soil from flowing out to the lower portion during the conveyance.

Looking at the detailed function and operation of each component as follows.

Figure 2 is a state diagram showing the operating state of the soil contamination purification apparatus by electron beam irradiation according to the present invention.

Polluted soil purification apparatus by the electron beam irradiation of the present invention is implemented to be able to clean the soil while moving to a locally contaminated place scattered in various places loaded on a vehicle, such as trailer 200 as shown.

After moving to a working place where contaminated soil exists, the contaminated soil is excavated with an excavator 210, and the contaminated soil is added to the hopper 111 in a state of containing moisture, and the injected soil 10 is treated according to the treatment capacity. It is fed from the hopper 111 to the top of the conveyor 113 at an appropriate speed.

The supplied soil is loaded with a predetermined thickness on the upper surface of the conveyance belt 114 and is transferred to the discharge port 110a. The electron beam accelerator 120 irradiates the accelerated electron beam to the conveyed soil in the direction of arrow (a). . Accordingly, the purification of the contaminants is carried out between the transport of the contaminated soil, the process will be described as follows.

Electrons accelerated by the electron beam accelerator 120 may contain water contained in the soil ( Strongly colliding with molecules Reactive radicals and ions such as ions are generated at a very high rate, and the radicals are oxidized and decomposed in a short time under a sufficient oxygen supply. In particular, OH radicals (hydroxyl radicals) are more important for the decomposition of contaminants because they have higher oxidizing power and easily decompose unsaturated hydrocarbons and aromatic compounds. Unlike other oxidants, OH radicals must be produced directly on site because they cannot be produced and stored in advance.

Therefore, the soil contaminant purifying apparatus by electron beam irradiation of the present embodiment moves to an area contaminated with hardly decomposable organic substances by using a vehicle equipped with auxiliary equipment, and forms a large amount of OH radicals in the contaminated soil by an electron beam accelerator. Purify.

The soil treated by the electron beam accelerator 120 is discharged to the outside through the outlet 110a, and the discharged soil is excavated when the amount of pollutants remaining satisfies the soil environmental standard value. If the soil is exceeded, it is converted into a natural degradable form and is reclaimed in the excavation site by adding microorganisms and hydrogen peroxide to promote the decomposition of organic matter remaining in the treated soil.

On the other hand, in the above embodiment has been described as being loaded in a separate vehicle for movement, the present invention is not limited to this, it can be made of a self-propelled structure having its own drive device.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

According to the present invention as described above, since oxidizing strong OH radicals generated by electron beam irradiation is used for pollutant oxidation, soil contaminated with hardly decomposable organic matter can be purified quickly, and thus secondary pollution such as groundwater This has the effect of being prevented.

In addition, the present invention is processed directly to the soil contaminated area and treated with contaminated soil at the site and then re-embedded in the excavation site, and by-products do not occur after the treatment, the time and costs for transporting the excavated soil to the treatment plant and There is an effect that can reduce the time and cost of secondary processing.

In addition, the present invention has the effect of preventing the environmental damage by harmful by-products and chemicals that may occur when heat treatment or cleaning the contaminated soil.

Claims (7)

A main body having a predetermined space formed therein, and having an inlet for injecting contaminated soil on one side thereof, and an outlet for discharging the treated soil on the other side thereof; A conveying means provided at a lower portion of the inlet of the main body and transferring the injected soil from the inlet to the outlet; An electron beam accelerator mounted on the main body so as to face the upper surface of the conveying means, and irradiating the electron beam to the transported soil to form highly reactive radicals in the soil to oxidatively decompose pollutants; And Is provided on one side of the main body, the power supply means for supplying power to the transfer means and the electron beam accelerator Soil purification apparatus by electron beam irradiation comprising a. The method of claim 1, The conveying means A plurality of feed rollers that rotate to receive power; A transport belt mounted to the plurality of transport rollers externally and transporting soil contaminated by the rotation of the transport roller to an outlet; A plurality of protruding members are formed on the outer surface of the conveyance belt in a direction orthogonal to the conveying direction to facilitate the conveyance of the soil. Soil purification apparatus by electron beam irradiation comprising a. The method of claim 2, It is provided in the longitudinal direction on both sides of the conveyance direction of the conveyance belt, the soil contaminated soil purification apparatus by electron beam irradiation further comprising a guide member for preventing the soil from flowing out to the lower portion during the transfer. The method of claim 1, Polluted soil purification apparatus by electron beam irradiation further comprising a hopper mounted to the inlet of the main body. The method according to any one of claims 1 to 4, It is provided in the lower portion of the main body soil contaminated soil purification apparatus by electron beam irradiation further comprising a transport means for moving freely. Digging the contaminated soil into a hopper of the main body; A second step of supplying and transporting soil on a conveyor installed in the main body; Irradiating the accelerated electron beam to the transported contaminated soil to oxidize contaminants; And Fourth step to discharge soil oxidized pollutants Soil purification method by electron beam irradiation comprising a. The method of claim 6, A fifth step of determining an amount of contaminants remaining in the soil discharged through the four steps; If the amount of contaminants remaining in the soil meets the soil environmental standard, the discharged soil is buried in the excavation site. If the soil exceeds the soil environmental standard, the microorganism and hydrogen peroxide are added to the excavation site to promote the decomposition of the converted organic matter. Landfill 6th Step Purifying soil contaminated by electron beam irradiation comprising a.