KR100414771B1 - Chemical oxidation method of petroleum-contaminated soil using electro-osmosis and apparatus thereof - Google Patents

Abstract

Disclosed is an oil in a contaminated soil using an electroosmotic phenomenon to smoothly move hydrogen peroxide in the contaminated soil by electroosmotic phenomenon to induce direct oxidative decomposition of oil contaminants by hydroxyl radicals and to further increase the removal rate through electrode polarity conversion. A method and apparatus for oxidative decomposition of contaminants. The present invention inserts a positive electrode and a negative electrode into a contaminated soil, and injects hydrogen peroxide into the positive electrode and simultaneously supplies a DC current, thereby smoothly moving the hydrogen peroxide solution by the electroosmotic phenomenon and reacting with the iron in the soil by radicals generated by the radicals. Causes contaminants to be oxidized Further, after the predetermined time elapses during the oxidative decomposition reaction, the flow direction of the hydrogen peroxide solution by the electroosmotic phenomenon is changed through polarity switching of the electrodes.

Description

Chemical oxidation method of petroleum-contaminated soil using electro-osmosis and apparatus etc.

The present invention relates to a method and apparatus for purifying soil contaminated with oil, and more particularly, to smoothly transfer hydrogen peroxide in contaminated soil by electroosmotic phenomenon to induce direct oxidative decomposition of oil pollutants by radicals. The present invention relates to a method and apparatus for oxidative decomposition of oil contaminants in a contaminated soil using an electroosmotic phenomenon to further increase the removal rate through electrode polarity conversion.

In general, soil and groundwater are contaminated by wastes such as urban, industrial, mining, dredging, nuclear, etc., which are incidentally generated due to population growth and industrial development, and poor processing of chemicals, oils, pesticides, etc. It is becoming. As such, soil and groundwater sources are caused by a wide variety of causes.

In Korea, most of the landfills that were installed before the late 1980's were landfills that were not equipped with a liner to block leachate from the landfill or low-grade liners such as vinyl or tents. These landfills are often located near valleys, plains, and rivers, which can be a source of pollution. Currently, there are about 2,000 landfills nationwide, according to 1996 statistics. In Korea, it is difficult to determine the exact number due to the widespread investigation of abandoned mines, but it is estimated to be more than 2,500.

Korea has succeeded in entering the industry in the process of industrialization, focusing on economic development for more than 40 years from the 1960s to the present, but at the cost of turning the country into a high mountain on the high seas. In the sixties and eighties, when industrialization was a ground-breaking task, environmental issues were not considered at all, and there was no awareness of environmental pollution. Therefore, pollution of soil and groundwater as well as air and water quality in hundreds of industrial parks and neighboring areas is in serious condition.

Soil pollution in industrial complexes varies from region to region but can take many forms, including heavy metals, oils, and sulfides. In Korea, new gas stations are being actively promoted due to the explosion of automobiles and the removal of gas station distance restrictions. Currently, the number of gas stations in Korea is over 10,000, and there is no investigation about leaks of these oil storage tanks.

Oil contaminants spilled into the soil by accident or deliberately spilled into the soil during oil refining, transportation, and storage processes are adsorbed on the surface of soil particles or migrate in the soil, resulting in long-term soil contamination and groundwater contamination. This, in turn, damages human and natural ecosystems directly and indirectly through a variety of pathways. Recently, the oil leakage of fuel oil is intensifying due to corrosion and aging of underground oil storage facilities in cities, factories and gas stations. The spillage of toxic and carcinogenic oil contaminants in the soil has become a serious problem not only in Korea but also abroad.

Oil contaminants are difficult to transport and remove due to their strong adsorption and low solubility in the soil. Therefore, it is difficult to apply the restoration technology using gas such as steam injection or vacuum extraction, and it is difficult to dissolve in water, so the effect of soil washing using groundwater is insignificant. Most of the other chemical and biological remediation techniques also have to first move contaminants from the soil surface to the fluidized bed, so that the treatment efficiency is not good under conditions of slow transport of contaminants such as in oil contaminated soils. Effective rehabilitation in these areas requires ways to improve the mobility and removal rates of oil pollutants.

In this way, if the contaminant is removed using a surfactant, the removal rate can be increased by improving the mobility of the contaminant, but a part of the surfactant may be adsorbed to the soil, causing additional contamination, and the waste solution after washing There is a drawback to reprocessing. In addition, when oxidizing agent is used to promote the decomposition of contaminants, there is an advantage that it does not need to treat additional waste solution and can be processed quickly. However, in fine grained ground such as clay, the permeability coefficient is low, so that additives are effectively contaminated. Have difficulty contacting Therefore, there is an urgent need for a method for smoothly inducing the movement of additives in order to remove contaminants in various soils including low permeability soils.

Accordingly, an object of the present invention is to solve the above-mentioned drawbacks, while injecting hydrogen peroxide into the contaminated soil, inserting the positive and negative electrodes and applying electricity to smooth the soil contaminated with hydrogen peroxide by electroosmotic phenomenon. Oxidation of oil in polluted soil using electroosmotic phenomena, which induce direct oxidative decomposition of oil pollutants by hydroxyl radicals and improve the removal efficiency of pollutants by converting electrode polarity and enhancing the fluidity of hydrogen peroxide at regular intervals. To provide a decomposition method.

In addition, another object of the present invention to provide an apparatus for implementing the oil contaminant oxidative decomposition method in the actual contaminated site.

Detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, in which numerals designate corresponding parts in the drawings.

1 is a device configuration showing an experimental example for explaining the oxidative decomposition of oil contaminants in contaminated soil using the electroosmotic phenomenon according to the present invention,

2 is a view showing a state in which the polarity of the electrode is switched in FIG.

** Explanation of symbols for main parts of drawings **

10,10a: reactor 20,20a: anode electrode bath

22,22a: positive electrode 24,24a: filter paper

26, 26a: cathode gas discharge pipe 30, 30a: cathode electrode tank

32,32a: negative electrode 34,34a: filter paper

36,36a: Cathode gas discharge pipe 40,40a: Power supply

60,60a: Supply solution reservoir 62,62a: Supply pipe

70,70a: Effluent storage tank 72,72a: discharge pipe

In order to achieve the above object, oxidative decomposition of oil contaminants in contaminated soil using the electroosmotic phenomenon according to the present invention inserts a positive electrode and a negative electrode into the contaminated soil, injects a hydrogen peroxide solution to the positive electrode, and applies a DC current to the electroosmotic phenomenon. By causing the hydrogen peroxide solution to move smoothly in the contaminated soil, it is characterized in that the pollutants are oxidatively decomposed by the hydroxyl radical generated by reaction with iron in the soil.

Oil pollutant oxidative decomposition device in contaminated soil using the electroosmotic phenomenon according to the present invention for achieving the above another object is inserted into the contaminated portion in the soil, the anode electrode tank having a positive electrode; A cathode electrode tank spaced apart from the cathode electrode tank at a predetermined interval and inserted into a contaminated portion in the soil, the anode electrode including a cathode; A supply solution storage tank connected to the anode electrode tank to supply a hydrogen peroxide solution; And a power supply for causing an electroosmotic phenomenon by supplying a DC current to the positive electrode and the negative electrode to allow the hydrogen peroxide solution to flow from the positive electrode to the negative electrode.

The present invention injects hydrogen peroxide, an oxidant, into a site where contaminants are present in contaminated soil, while simultaneously inserting a positive electrode and a negative electrode into the soil to supply current, so that the hydrogen peroxide moves from the positive electrode to the negative electrode quickly and smoothly. Let's do it. When hydrogen peroxide moves into the contaminated soil, it reacts with the iron component (Fe ²⁺ ) present in the soil to produce the Fenton reaction as shown in the following formula to produce radical hydroxide.

Fenton oxidation, which causes the Fenton reaction as described above, is an advanced oxidation process (AOP) for oxidatively decomposing oil contaminants. A reaction in which oil contaminants are decomposed by radical hydroxides produced by the reaction between hydrogen peroxide and iron. to be. In the actual soil treatment, iron exists as a mineral in the soil, so a reaction such as the Fenton oxidation reaction occurs without supplying iron separately. This reaction is called a Fenton-like reaction.

Hydroxide radicals produced by the Fenton-like reaction as described above are extinguished by decomposing oil contaminants as soon as radicals are generated due to their short survival. The radical radicals (.OH) thus formed have a strong oxidizing power and have the property of oxidizing and decomposing organic substances as pollutants and reacting with heavy metals to change into harmless compounds. As such, if hydrogen peroxide is continuously injected into the soil in the soil while the electricity is supplied to the electrodes, the radicals are oxidatively decomposed and harmless while the radicals are generated through the above reaction.

In the present invention, by using the electroosmotic phenomenon to improve the mobility of the hydrogen peroxide, the radicals generated therefrom react with the oil pollutants distributed in the soil to remove the most important function. Electroosmotic phenomena usually have a negative charge on the surface of the soil. Therefore, when the cations are concentrated near the soil by the attraction force and the electric current is applied to the electrodes, the cations move from the positive electrode side to the negative electrode and the water flows in the same direction. This is a phenomenon that occurs. At this time, when oil contaminants are attracted to the negative electrode together with water, oil contaminants are extracted to the effluent storage tank to purify oil contaminants from the soil. In the present invention, the electroosmotic phenomenon serves to oxidize contaminants in the soil by moving hydrogen peroxide toward the negative electrode by the flow of water.

Oxidative decomposition of the contaminants in the soil as described above is active in the injection portion, that is, the positive electrode side in which hydrogen peroxide is injected, the removal efficiency of the contaminant is high, while the removal efficiency decreases away from the injection portion. Therefore, in the present invention, in order to compensate for the above disadvantages, the polarity of the positive electrode and the negative electrode is changed after a certain time so that the flow of hydrogen peroxide, which is an oxidizing agent, proceeds in the opposite direction. As a result, the removal rate is increased in the portion where the removal rate of the contaminants has fallen earlier, and the removal rate is increased in the portion where the removal rate is high, thereby achieving more efficient and uniform removal efficiency in all the sections.

Hydrogen peroxide is used as a selective oxidant for the liquid phase oxidation reaction required by the present invention, and since the oxidizing agent, molecular oxygen or organic peroxide, etc., causes environmental problems as organic by-products when decomposing and contaminates the risk of explosion. Not suitable for use in purifying Therefore, in the present invention, environmentally friendly hydrogen peroxide is selected as a clean oxidant. In particular, the concentration of hydrogen peroxide introduced is determined in consideration of the moisture content and pollutant concentration in the soil and other organic matter content. In addition, the addition of a small amount of electrolyte with hydrogen peroxide increases the conductivity in the soil to facilitate the movement of hydrogen peroxide, which in turn promotes the oxidative decomposition of oil pollutants and speeds up the movement to increase the purification efficiency. Of course, as the electrolyte, hydrogen peroxide contained in the water itself also serves as an electrolyte, but preferably NaCl, KH ₂ PO ₄ , MgSO ₄ , and the like, in addition to the ionic solution.

Since the present invention induces the rapid and smooth movement of hydrogen peroxide, which is an oxidant, by electroosmotic phenomenon, it can be applied even in areas with fine grained soil, and the desired effect can be seen.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a device configuration showing an experimental example for explaining the oxidative decomposition of oil contaminants in contaminated soil using the electroosmotic phenomenon according to the present invention.

Referring to the experimental apparatus illustrated in FIG. 1, the anode electrode tank 20 and the cathode electrode tank 30 are disposed on the left and right sides of the reactor 10 containing the contaminated soil sample, respectively. The positive electrode 22 and the negative electrode 32 are disposed in the 20 and the negative electrode bath 30, respectively. The positive and negative electrodes 22 and 32 are made of a graphite plate having a thickness of 0.8 cm and a diameter of 8 cm, and the positive electrode 22 and the negative electrode 32 are connected to a DC power supply 40 for supplying a DC power supply. Voltage supply is possible. As the material of the positive and negative electrodes 22 and 32, conductors such as carbon, stainless steel, and titanium may be used. In the anode electrode tank 20 of hydrogen peroxide, platinum, iridium, iron, or such components which promote decomposition consumption may be used. It is not recommended to use coated electrodes. Then, the soil sample 50 is interposed between the soil sample 50 and the positive and negative electrode baths 20 and 30 by two sheets of filter paper 24 and 34 made of glass fibers, respectively. It prevents inflow into the inside.

The reaction tank 10 described above is made of a glass tube of 4 cm in diameter, 10 cm or 20 cm in length, and the electrode tanks 20 and 30 attached to both sides thereof have a volume of 75 cm 3. The positive and negative electrode baths 20 and 30 are connected to the positive and negative gas discharge tubes 26 and 36 respectively for discharging gas generated therein to the outside. Of course, these positive and negative gas discharge pipes 26 and 36 are each equipped with control valves. In addition, the supply solution storage tank 60 is connected to the anode electrode tank 20 through the supply pipe 62, and the outflow water storage tank 70 is connected to the cathode electrode tank 30 through the discharge pipe 72.

In actual application of the present invention to contaminated soil in the field, the oxidative decomposition apparatus needs to be removed from the reactor 10 in the configuration as shown in FIG. In other words, the large contaminated soil itself acts as a reactor, so that the positive and negative electrodes are inserted into the anode and cathode electrode modules by drilling holes in the soil to the contaminated area, and connecting the power supply to the wires. By supplying a DC power supply to cause the electroosmotic phenomenon, the hydrogen peroxide solution and the electrolyte is put into the supply solution storage tank connected to the anode electrode tank and the supply pipe to be injected into the contaminated soil through the anode electrode tank. The injected hydrogen peroxide solution moves from the anode to the cathode by the electroosmotic phenomenon and oxidizes the contaminants present therebetween to flow to the cathode. Effluent flows to the cathode electrode tank is transported to the external effluent storage tank through the discharge pipe connected to the cathode electrode tank.

The soil sample 50 is filled with the soil sample 50 in the reactor 10 by using the above-described structure, and the current is supplied to the electrodes 22 and 32 to cause an electroosmotic phenomenon to move the hydrogen peroxide solution. The process of oxidatively decomposing the pollutant contained in 50) will be examined through actual experimental examples.

Example 1

In the reactor 10 of length 10cm shown in FIG. 1, 500 mg of phenanthrene-contaminated soil sample 50 per kg of soil was filled, and 10% hydrogen peroxide solution was supplied to the supply solution storage tank 60. At this time, 0.005M KH ₂ PO ₄ was added to the hydrogen peroxide solution as an electrolyte. Then, a 10 mA DC current was applied to the positive electrode 22 and the negative electrode 32 to cause an electroosmotic phenomenon. As a result, the fluid flow from the positive electrode 22 to the negative electrode 32 was observed. After 7 days, samples were taken from the anode to the cathode at 2 cm intervals, and the amount of phenanthrene remaining in the soil was analyzed by high performance liquid chromatography (HPLC). In more detail, the HPLC method is described. After completion of the experiment, the soil is collected by distance, dried, 1 g of which is taken up in 10 ml of methanol, stirred for 24 hours, and then the supernatant of the stirred liquid is injected into the HPLC analyzer. When the peak graph is produced over time and the area is converted into the concentration, the phenanthrene concentration is obtained.

The phenanthrene used as a contaminant in this experiment is one of three ring polyaromatic hydrocarbons (PAH), which does not dissolve well in water and has strong adsorption to soil. Therefore, if the pollutants can be oxidatively decomposed, substances having weaker adsorption can be easily removed. Thus, the present embodiment intends to prove the effect of the present pollutant removal method using materials that are somewhat difficult to remove. In addition, only the electrolyte was changed to NaCl and MgSO ₄ in the above experiments, and the experiment was performed under the same conditions.

On the other hand, in Comparative Example 1, no current supply, 10% hydrogen peroxide, 0.005M KH ₂ PO _{4 in} the conditions of the other conditions were tested in the same manner as above. In addition, in Comparative Example 2, the test was performed using only KH ₂ PO ₄ electrolyte while supplying current but not injecting hydrogen peroxide.

As a result, the result shown in Table 1 was obtained.

Table 1. Removal rate of contaminants when hydrogen peroxide is moved by electroosmotic phenomenon

object Supply solution Final phenanthrene concentration / initial phenanthrene concentration % Removal electric current Electrolyte Hydrogen peroxide 0 cm (anode) 2 cm 4 cm 6 cm 8 cm 10 cm (cathode) Comparative Example 1 No supply KH ₂ PO ₄ 10% 0.124 0.910 1.000 1.010 1.006 1.021 10.0 Comparative Example 2 supply KH ₂ PO ₄ none 1.000 0.946 1.020 0.700 0.902 1.047 8.13 Example 1-1 supply KH ₂ PO ₄ 10% 0.005 0.003 0.011 0.004 0.049 0.016 98.4 Example 1-2 supply NaCl 10% 0.027 0.024 0.017 0.016 0.033 0.117 96.7 Example 1-3 supply MgSO ₄ 10% 0.061 0.073 0.077 0.126 0.110 0.144 90.2

As can be seen in Table 1, in Comparative Example 1, in which hydrogen peroxide was injected into the contaminated soil and no current was supplied, it was difficult to move hydrogen peroxide due to a hydraulic gradient in low permeability soils. However, no decomposition occurs at the cathode, which shows very low removal efficiency. In addition, in the case of Comparative Example 2 with a current supply but not injected with hydrogen peroxide, fluid flow due to electroosmotic phenomenon occurred, but the phenanthrene tended to be adsorbed to the soil, so the cleaning effect was low and the removal efficiency was low.

On the other hand, when the current was supplied while injecting hydrogen peroxide, all of the present Example 1-1, 1-2, and 1-3 showed a removal rate of more than 90%. For example, in the present embodiment 1-1, only 0.005 remains in the positive electrode when the initial amount is 1 in the positive electrode, and only 0.016 remains in the negative electrode. In the present three examples, only the difference in the type of the introduced electrolyte is the same in the core of the present invention that hydrogen peroxide is supplied with the current supply, and in all three embodiments, the residual ratio of phenanthrene is reduced to less than 0.15 in all sections. It can be seen that the removal efficiency is very good. In each of the three embodiments, the KH ₂ PO ₄ and NaCl have a slightly higher removal rate than the MgSO ₄ added depending on the electrolyte. Almost the same result.

Example 2

FIG. 2 is a device configuration diagram showing an example of an electrode polarity conversion test in which electrode polarity is changed in FIG. 1.

Phenanthrene in the soil for 4 weeks while supplying electricity by injecting 3.5% hydrogen peroxide solution without injecting electrolyte by contaminating the actual field soil 50a in the same manner as in Example 1 in the reactor 10a having a length of 20 cm. Purification experiment was performed. At this time, two weeks later, the polarity of the electrodes 22a and 32a was changed once to the state of FIG. Of course, according to the electrode polarity conversion, the supply solution storage tank 60a to which hydrogen peroxide is supplied is connected to the anode electrode tank 20a that was the cathode electrode tank 30 before, and to the cathode electrode tank 30a that was the anode electrode tank 20. Effluent storage tank 70a is to be connected. As a result, the injection of the hydrogen peroxide solution takes place on the other side different than before the electrode polarity conversion. In addition, as a comparative example, the electrode polarity was not changed at all, and the other conditions were tested in the same manner as in this example, and the results were obtained after 4 weeks. The results are shown in Table 2 below.

Table 2. Effect analysis of electrode polarity conversion while moving hydrogen peroxide by electroosmotic phenomenon.

object Electrode Polarity Switching Final phenanthrene concentration / initial phenanthrene concentration % Removal 0 cm (anode) 2 cm 4 cm 6 cm 8 cm 10 cm 12 cm 14 cm 16 cm 18 cm 20 cm (cathode) Comparative example none 0.005 0.013 0.160 0.220 0.260 0.290 0.350 0.540 0.750 0.750 0.830 61.4 Example 1 time 0.035 0.039 0.150 0.190 0.320 0.400 0.270 0.185 0.204 0.204 0.059 80.5

As shown in Table 2 above, in the comparative example without performing the electrode polarity conversion, the phenanthrene removal rate was high at the positive electrode, but the removal rate rapidly decreased toward the negative electrode, so that it was hardly removed at the 20 cm portion of the negative electrode. This is because the organic soil is consumed by other organic matter in the field soil, which shows a high removal rate near the anode where hydrogen peroxide is injected, whereas hydrogen peroxide is not reached as it goes toward the cathode, so the removal rate is rapidly decreased.

On the other hand, in the present Example, in which one electrode polarity conversion was performed two weeks after the experiment, the removal rate of phenanthrene at the positive electrode and the phenanthrene removal at the negative electrode were almost similar, and thus, uniform effective removal rates were shown throughout the entire period. In total, the removal rate of the comparative example was only 61.4%, but the removal rate of the present embodiment was 80.5%, which is considerably higher than the case where the electrode polarity conversion was not performed, and about 20% in this example. The removal efficiency is increased.

As can be seen from the above experiment, if the electrode polarity conversion is performed in a timely manner, the removal efficiency of contaminants in the soil can be improved. Of course, the electrode polarity conversion can be performed more than once when the treatment period of the contaminants is long.

The embodiments disclosed herein are only presented by selecting the most preferred examples to help those skilled in the art from the various possible examples, the technical spirit of the present invention is not necessarily limited or limited only by this embodiment, the present invention Various changes and modifications are possible within the scope without departing from the spirit of the invention, as well as other equivalent embodiments.

As described above, the oil pollution oxidation decomposition method in the contaminated soil using the electroosmotic phenomenon according to the present invention by moving the hydrogen peroxide smoothly in the contaminated soil by the electroosmotic phenomenon by directly oxidizing the oil contaminants by radical hydroxide There is an advantage to increase the efficiency of pollutant removal in contaminated soil. Furthermore, by switching the polarity of the electrodes to convert the cathode, which is hard to reach hydrogen peroxide, to the anode so that the hydrogen peroxide is sufficiently supplied, uniform removal is possible throughout the entire contaminant, and the removal rate of the pollutant is further increased. Accordingly, the present invention is economical because it is possible to efficiently and quickly clean the contaminated soil is shortened purification time and reduced purification treatment cost.

Claims (10)

Hydrogen peroxide solution reacts with iron in the soil by smoothly moving the contaminated soil by inserting a positive electrode and a negative electrode into the contaminated soil, injecting a hydrogen peroxide solution into the positive electrode, and applying a direct current to the electroosmotic phenomenon. Oxidative decomposition of oil contaminants in contaminated soil using an electroosmotic phenomenon characterized by oxidative decomposition of contaminants by radicals. [Claim 2] The oxidative decomposition method of oil pollutants in contaminated soil according to claim 1, wherein the electrolyte is mixed with the hydrogen peroxide to inject an electrolyte toward the positive electrode to smooth the electroosmotic flow. The method of claim 2, wherein the electrolyte is hydrogen peroxide oxidative decomposition of contaminated soil using an electroosmotic phenomenon, characterized in that the water or ionic solution containing hydrogen peroxide. [4] The method of claim 3, wherein the ionic solution is a solution containing NaCl, KH ₂ PO ₄ , MgSO ₄ , and oxidative decomposition of oil contaminants in contaminated soil using an electroosmotic phenomenon. The electroosmosis according to any one of claims 1 to 4, wherein after the predetermined period of time during the oxidative decomposition reaction, the flow direction of hydrogen peroxide by the electroosmotic phenomenon is changed through polarity switching of the electrodes. Oxidative decomposition method of oil pollutant in contaminated soil using phenomenon. An anode electrode inserted into a contaminated portion in the soil and having a cathode; A cathode electrode tank spaced apart from the cathode electrode tank at a predetermined interval and inserted into a contaminated portion in the soil, the anode electrode including a cathode; A supply solution storage tank connected to the anode electrode tank to supply a hydrogen peroxide solution; And An apparatus for oxidizing oil contaminants in contaminated soil using an electroosmotic phenomenon comprising a power supply for causing an electroosmotic phenomenon by supplying a DC current to the positive electrode and the negative electrode, thereby allowing the hydrogen peroxide solution to flow from the positive electrode to the negative electrode. The electroosmotic phenomenon according to claim 6, further comprising an effluent storage tank connected to the cathode electrode tank and having a effluent discharged to the cathode electrode tank and discharged to the outside of the soil by the electroosmotic phenomenon. Oxidative decomposition device of oil contaminants in used soil. The method of claim 6, wherein the positive and negative electrode tanks are open at one side, and the positive and negative electrodes are disposed, respectively, and a filter paper or a filter cloth is interposed between the electrodes and the soil so that the positive and negative electrodes are not in direct contact with the soil. Oil pollutant oxidative decomposition device in the contaminated soil using an electroosmotic phenomenon characterized in that it is. 10. The method of claim 6 or 8, wherein the positive electrode and the negative electrode in each of the contaminated soil using an electroosmotic phenomenon, characterized in that the positive and negative gas discharge pipe for discharging the gases generated from the inside to the outside is installed. Oil pollutant oxidizing device. The method of claim 6, wherein the electrodes are made of a conductor such as carbon, stainless steel, titanium, and the like, and include platinum, iridium, iron, or a coating thereof to prevent self-dissipation in the anode electrode tank of the hydrogen peroxide solution. Oil pollutant oxidative decomposition device in the contaminated soil using an electroosmotic phenomenon characterized in that not.