KR20100118076A - Cleaning system of pollution soil - Google Patents

Abstract

PURPOSE: A washing system of contaminated earth and sand is provided to efficiently purify contaminated soil by the electrolysis of the extract of the remaining oil and the volatilization of oil. CONSTITUTION: Contaminated soil(1) is heated by steam. An oil volatilizing device(2) volatilizes oil. An oil liquefying device(3) liquefies and cools the volatilized oil. A steam generator generates steam by combusting liquefied oil. The remaining oil is extracted from soil after the volatilization of oil by amphiphile solvent and water. An extract purifying device(4) rectifies the extract by the electrolysis.

Description

Cleaning system of pollution soil

The present invention relates to a soil cleaning system for soil contaminated by leakage of oil, such as a gas station or chemical plant.

The following proposals have been made as a conventional method for purifying contaminated soil (Patent Document 1).

This proposal relates to a method for treating soil contaminated with hardly degradable organic pollutants, in particular organic pollutants such as organic chlorine compounds, aromatic compounds, pesticides and preservatives such as petroleum and residues such as crude oil, heavy oil, diesel oil, lubricants, etc. It relates to a new technology that makes the soil easy, safe, and harmless to the environment, and is described below.

Recently, soil pollution and groundwater contamination by pollutants of petroleum and residues such as organic chlorine compounds, aromatic compounds, pesticides and preservatives, such as crude oil, heavy oil, diesel oil, lubricating oil, etc. have become a significant social problem. Various methods have been proposed and implemented in this regard. If these methods are largely divided, the method of purifying contaminated soil in situ, the method of enclosing contaminated soil in situ, the method of excavating contaminated soil and refilling it in situ, excavating contaminated soil, and transporting the contaminated soil to the treatment facility This can be divided into methods for cleanup, disposal and disposal in landfills.

In addition, this proposal provides a method of detoxifying contaminants in soil in a manner that does not harm the environment easily and safely at low cost in view of the benefits of each of the above methods, and thus, activated carbon having hydrogen peroxide generating ability in the presence of organic substances. By adding to the contaminated soil, the soil contaminated with harmful substances can be cleaned up in its original location very easily and at low cost.

However, this method has a problem that the degree of soil purification is not necessarily clear.

Japanese Patent Laid-Open No. 2006-223969

It is an object of the present invention to provide a cleaning system of contaminated soil that can be treated more reliably.

In order to solve the above problems, the present invention has been made the following technical means.

(1) The contaminated soil cleaning system of the present invention includes an oil volatilization mechanism that volatilizes soil by heating contaminated soil with steam, an oil liquefaction mechanism that cools and volatilizes the volatized oil, and burns the vaporized liquid to vaporize the vaporized oil. And an extracting water purifying mechanism for extracting residual oil from the soil after volatilization of the oil by amphiphilic solvent and water, and electrolytically purifying the extract water. Residual oil not volatilized in contaminated soil is characterized in that it is purified by electrolysis with an extraction water purification mechanism.

(A) In this cleaning system, contaminated soil is heated by steam to volatize the oil, the volatilized oil is cooled and liquefied, and the liquefied oil is burned to generate the steam, followed by the amphiphilic solvent and water. Residual oil is extracted from the soil after volatilization, and the extracted water is electrolyzed to purify.Residual oil that has not been volatilized from the contaminated soil in the oil volatilization apparatus is purged by the extract water purification apparatus. The following advantages are obtained because the contaminated soil was cleaned by a unique two-step treatment called treatment.

This soil cleaning system has the advantage of not being particularly disturbed even if the amount of oil in the soil is high, but volatilization treatment has a disadvantage that high boiling point oil is likely to remain or needs to be heated to a high temperature. However, if the current flows correctly, it can handle high cleanliness, but in the case of oily oil, even though it can be dissolved in water, it is too oily and current is difficult to flow. Thus, it is possible to efficiently purify contaminated soil by volatilization of the oil and electrolysis of the extracted water of the residual oil.

In other words, the residual oil that could not be volatilized in the oil volatilization mechanism is likely to have a higher boiling point, but such a high boiling oil content can be solubilized in water with an amphiphilic solvent, transferred to water and electrolyzed (after purification). Treated water can be reused for its treatment), and in contaminated soil, oil is removed and cleaned, allowing landfilling to the original soil. In addition, the high-boiling fraction is considered to have a relatively high molecular weight. Thus, even when such a large molecular weight is dissolved in water with an amphiphilic solvent, a strong oxidation effect of the active oxygen generated during electrolysis (OH radical), etc. May be decomposed by

In addition, in the method of adding activated carbon having hydrogen peroxide generating ability to contaminated soil in the presence of organic materials described in the prior art, there may be places where there is doubt about the effectiveness of the purification because the amount of leakage oil varies depending on the place of the soil. (Contaminated oil is not recovered from the soil in the conventional method.) In this system, the cleanliness of the treated water after purification and the soil sediment after purification can be easily determined by measuring or the like, thus enabling more reliable treatment.

(B) As described above, since the oil was volatilized from the contaminated soil, the remaining oil still adhered was extracted with an amphiphilic solvent and water, so that only the electrolytic treatment (without volatilization) was purified. It is possible to reduce the drug cost by reducing the amount of amphiphilic solvent used more than in the case. In addition, since the oil generated by volatilization and liquefaction from the contaminated soil is combusted to generate steam, and the steam (or also steam) is used to heat the contaminated soil, the contaminated oil can be effectively used as energy. When only calorie | heat amount of liquefied oil is insufficient, heating means, such as another oil, can be used together.

In this way, the cost of the amphiphilic solvent is reduced and the reuse of the contaminated oil as energy can achieve cost savings to the extent that the processing cost can be economically sufficient. (The heating process requires heating to a very high temperature. And very expensive), can provide a practical cleansing system of contaminated soil rather than tabletop theory. As a result, it is possible to promote reuse of polluted soils (most of the empty spaces of gas stations and chemical plants are oil-contaminated), and further expand employment and demand through economic activities such as redevelopment of dormant or vacant lands. It can contribute greatly to the improvement of the standard of living of the people.

As the amphipathic solvent, a solvent having affinity for both oil and water can be used, and DMSO, DMAc, IPA, BDG (butyl diglycol) and the like can be used, and the amphiphilic solvent solubilizes the oil in water. To facilitate the electrolysis. Moreover, in the oil liquefaction mechanism which cools and liquefies the volatilized oil, it can classify according to temperature zone (gasoline region, a gas oil region, a heavy oil region, etc.). In addition, since contaminated soil is considered to contain water in many cases, it can be heated to about 100 degreeC first, and can evaporate and discharge moisture, and can heat up and heat so that oil may evaporate.

(2) In the oil volatilization mechanism, steam can be blown while stirring contaminated soil. In this configuration, contaminated soil can be heated more uniformly without blurring, and volatilization of oil due to steam heating can be efficiently performed. Polluted by steam The heating of the soil may be carried out indirectly through a medium (cylinders or chambers described later) or may be carried out directly.

(A) A screw mechanism can be used as the oil volatilization mechanism. Specifically, the screw is rotated inside the cylinder to send the soil out to the front, and indirectly heats the soil contaminated with steam from the wall of the cylinder, and the soil after the volatilization of oil is discharged from the cylinder outlet to be recovered (sent to the extract water purifying mechanism). In this case, the volatilized oil may be discharged from the plurality of holes protruding upward from the cylinder. Soil is supplied from a hopper installed at the cylinder inlet and indirectly heated by steam through the cylinder wall. The hopper may supply contaminated soil by a belt conveyor.

In addition, the temperature gradient is attached to the cylinder, and the set temperature is gradually increased from the temperature zone where the water at the inlet side is evaporated to the high temperature zone where the oil at the outlet side is evaporated. It may be. It is also possible to have a structure in which contaminated soil is directly heated by steam.

(B) A chamber mechanism including a stirring blade can be used as the oil volatilization mechanism. Specifically, the oil-contaminated soil is accommodated in the chamber, and the stirring blade is rotated by a motor so as to prevent volatilization of the oil from occurring depending on the place. The heated steam can be supplied between the double walls of the chamber circumference to allow the volatilized oil to be discharged from several holes protruding above the chamber. Contaminated soil is supplied from the hopper installed at the top of the chamber. When the treatment is completed, the hinged opening and closing lid is opened to take out the soil in the chamber and send it to the extraction water purification apparatus. This process is performed in batch units. It is also possible to rotate the chamber itself (body side) rather than the stirring vane.

(3) The combustion gas component generated when the liquefied oil component is burned may be transferred into the water by a scrubber, and the combustion gas component-containing water may be purified together by the extracting water purifying mechanism. In this way, this earth and sand cleaning system can be used as a self-contained treatment system that can safely clean the earth without incurring secondary pollution burden (air pollution due to combustion gases). have. The amphiphilic solvent may be added when the combustion gas component is transferred into the water by a scrubber.

(4) It may also be exemplified when edible oil such as fried oil, margarine, mayonnaise, dressing or vegetable oil leaks into the soil as the oil fraction.

Unexpected disasters such as A heavy oil or other oil spills from marine oil tanks or other vessels (sea pollution), or these oils are deposited on the shore and are attached to the rocks, sand, and algae when the waves hit. May occur. Such sand, algae, seaweed, etc. can also be restored to the original rich nature by applying the present cleaning system as polluted soil (rock, algae, seaweed, etc.) to clean the coastal area while reusing contaminated oil as energy. As a result, it is possible to revive the operation of the disaster victims and at the same time, to revive the beautiful scenery as a coastal resort tourist destination with a view of the sea.

The present invention is configured as described above has the following effects.

Since it is possible to efficiently purify contaminated soil by the volatilization of oil and the electrolysis of the extracted water of the residual oil, it is possible to provide a cleaning system of contaminated soil which can be treated more reliably.

BRIEF DESCRIPTION OF THE DRAWINGS It is a system flow chart explaining 1st Embodiment of the washing | cleaning system of the contaminated soil of this invention.
Fig. 2 is a system flow diagram illustrating a second embodiment of the cleaning system for polluted soil of the present invention.

Hereinafter, embodiments of the present invention will be described.

Embodiment 1

As shown in FIG. 1, the cleaning system of the contaminated soil of this embodiment is the oil volatilization mechanism 2 which volatilizes the oil by heating the contaminated soil 1 by steam, and the oil liquefaction which cools and liquefies the volatilized oil. The residual oil is extracted from the mechanism (3), the steam generator (boiler) which burns the liquefied oil to generate the steam, and the soil (cleaning soil) after volatilization of the oil by the amphipathic solvent and water, Extraction water purification mechanism (4) having an extract water purifying mechanism (4) for electrolyzing and extracting the extracted water, and the oil fraction volatilization (2), the residual oil which is not volatilized in the contaminated soil (1) in the extract water purification mechanism (4) Purify by electrolysis.

As the amphipathic solvent, a solvent having affinity for both oil and water can be used, and DMSO, DMAc, IPA, BDG (butyl diglycol), etc. can be exemplified. It can be solubilized to facilitate the electrolysis. In addition, in the oil liquefaction mechanism 3 which cools and liquefies the volatilized oil component, it can classify according to a temperature zone (gasoline region, a diesel oil region, a heavy oil region, etc.). In addition, since the contaminated soil 1 is likely to contain water in many cases, it can be heated to about 100 ° C. first to evaporate and discharge the water, and then heated and heated to evaporate the oil.

A screw mechanism is used as the oil volatilization mechanism 2. Specifically, the screw 6 rotates in the cylinder 5 to send the soil out to the front, and volatilizes the oil at the cylinder outlet 7 while heating the soil soil 1 indirectly with steam from the wall of the cylinder 5. The later earth and sand are sent out and recovered (sent to the extraction water purifying mechanism 4), so that the oil volatilized in the plurality of hole portions provided above the cylinder 5 can be removed. Soil is supplied from a hopper 8 installed at the inlet of the cylinder 5 and indirectly heated by steam through the wall of the cylinder 5. Contaminated soil 1 may be supplied to the hopper 8 by a belt conveyor (not shown).

In this oil volatilization mechanism (2), the polluted soil (1) is allowed to steam while stirring, so that the polluted soil (1) can be heated more uniformly without erasing, and the volatilization of oil according to steam heating can be efficiently performed. can do. Pollution of the soil 1 by steam can be carried out indirectly through the medium (cylinder 5 wall), or can be carried out directly.

It is also possible to have a structure in which the contaminated soil 1 is directly heated by steam. In addition, a temperature gradient is applied to the cylinder 5 to increase the set temperature gradually from the temperature zone where the water at the inlet side evaporates to the high temperature zone where the oil at the outlet side evaporates, and form a bulge hole for discharging the volatiles above each other. You may.

The combustion gas component generated when the liquefied oil is combusted is transferred into the water by a scrubber (not shown), and the combustion gas component-containing water is purged together by the extracting water purifying mechanism 4. The cleaning system of (1) can be configured as a self-contained treatment system that can safely clean the earth without giving secondary pollution burden (air pollution by combustion gas) to the environment. The amphiphilic solvent may be added when the combustion gas component is transferred into the water by a scrubber.

Next, the use condition of the cleaning system of the soil contaminated soil of this embodiment is demonstrated.

(A) In this cleaning system, contaminated soil 1 is heated by steam to volatize the oil, the volatilized oil is cooled and liquefied, and the liquefied oil is burned to generate the steam, followed by amphiphilic solvent and water. Extracts residual oil from the soil after volatilization of the oil and purifies the extracted water by electrolysis, and the residual oil which has not been volatilized from the contaminated soil 1 in the oil volatilization mechanism 2 is extracted water purification mechanism 4 ) To clean the contaminated soil (1) by a special two-step treatment, such as volatilization and electrolysis treatment can be obtained the following advantages.

This system has the advantage that it does not particularly affect the soil oil content, but volatilization treatment has the disadvantage that high boiling point oil is easy to remain or needs to be heated up to high temperature, and the advantage that it can be treated with high cleanness if current flows correctly However, in the case of a large amount of oil, even if it can be dissolved in water, it is an excess of oil, which makes it difficult to flow a current, and thus, a combination of electrolysis treatment which has a disadvantage in that it is difficult to treat. This makes it possible to efficiently purify the contaminated soil 1, and to ensure the treatment more reliably.

In other words, the residual oil that has not been volatilized in the oil volatilization mechanism 2 is likely to have a higher boiling point, but such a high boiling oil content can also be solubilized in water with an amphiphilic solvent, transferred into water, and purified by electrolysis. (The treated water after purification can be reused for the treatment.) At the same time, in the contaminated soil 1, the oil is removed and cleaned, so that it can be refilled into the original soil. In addition, the high-boiling fraction is considered to have a relatively high molecular weight, and if such a large molecular weight is dissolved in water with an amphiphilic solvent, a strong oxidation action of active oxygen (OH radicals, etc.) generated during electrolysis is obtained. It can decompose by.

In addition, in the method of adding activated carbon having hydrogen peroxide generating ability to contaminated soil in the presence of organic materials described in the prior art, the amount of leakage oil will be different depending on the place of the soil, and there may be places where there is doubt about the effectiveness of the purification. In the method, contaminated oil is not recovered from the soil), and in this system, the cleanliness of the treated water after purification and the soil sediment after purification can be easily grasped by measurement or the like, thus enabling more reliable treatment.

 (B) As described above, since the oil was volatilized from the contaminated soil 1, the remaining oil still attached was extracted with an amphiphilic solvent and water, so that the electrolytic treatment (without volatilization) was performed. It is possible to reduce the drug cost by reducing the amount of amphipathic solvent used than in the case of purification alone. In addition, since the vaporized volatilized oil from the contaminated soil 1 is combusted to generate steam, and the steam (or also steam) is used, the contaminated soil 1 is heated so that the contaminated oil can be effectively used as energy. Can be. If only the calories of the liquefied oil is insufficient, the heating means of other oils may be used in combination.

By reducing the drug cost of the amphiphilic solvent and reusing it as energy of the contaminated oil, the treatment cost can be reduced to the extent that it is economically feasible enough. It costs a lot), and can provide a cleaning system of practical soil 1 that is not tabletop theory. As a result, it is possible to promote reuse of polluted soils (most of the empty spaces of gas stations and chemical plants are oil-contaminated), and further expand employment and demand by activating economic activities such as redevelopment of dormant or vacant lands. It can greatly contribute to improving the quality of people's lives.

Embodiment 2

As shown in Fig. 2, the cleaning system of the contaminated soil 1 of this embodiment uses the chamber 10 in which the stirring blade 9 is incorporated as the oil volatilization mechanism 2. Specifically, the soil soil 1 by oil is contained in the chamber, and the stirring blade 9 is rotated by a motor so that the purification unevenness of the place is not generated so that the stirring of the oil is performed. The heated steam is supplied between the double walls of the outer circumference of the chamber 10 so that the volatilized oil is discharged from the plurality of hole portions protruding above the chamber. The contaminated soil 1 is supplied from the hopper 8 installed in the upper part of the chamber 10. And when the processing is completed, the hinged opening and closing lid 11 is opened to take out the soil in the chamber 10 and send it to the extraction water purification mechanism (4). This process is performed on a batch basis. It is also possible to rotate the chamber 10 itself (body side) instead of the stirring blade 9.

It is possible to efficiently purify contaminated soil by the volatilization of oil and the electrolysis of the extracted water of the residual oil, and by applying it more reliably, it can be applied to various soil treatment applications.

One; Soil pollution
2; Oil volatilization mechanism
3; Oil liquor
4; Extraction Water Purification Apparatus

Claims (3)

An oil volatilization mechanism (2) for heating the contaminated soil (1) with steam to volatize the oil, an oil liquefaction mechanism (3) for cooling and liquefying the volatilized oil, and burning the liquefied oil to generate the steam. And a water extraction mechanism (4) for extracting residual oil from the earth and sand after volatilization of the oil by an amphiphilic solvent and water, and purifying the extracted water by electrolysis. 2) The cleaning system of the soil contaminated soil, characterized in that the remaining oil that has not been volatilized from the soil contaminated soil (1) by electrolysis in the extraction water purification mechanism (4).
The cleaning system for polluted soil according to claim 1, wherein the oil fraction volatilization mechanism (2) exerts steam while stirring the polluted soil (1).
The combustion gas component generated in the combustion of the liquefied oil is transferred into water by a scrubber, and the combustion gas component-containing water is purified together by the extracting water purifying mechanism (4). Cleaning system for contaminated soil.

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