KR100928216B1 - Soil Restoration System Using Electrodynamics and Its Method - Google Patents

Abstract

The present invention relates to a soil restoration system using electrodynamics and a method thereof, comprising: side electrodes installed in a straight side channel formed on both sides of the plantation; A central electrode located at the center of the lower portion of the plantation and installed at an inner center of the straight central channel parallel to the side channel; And a power source capable of applying a voltage or a current to the side electrode and the positive electrode.

By providing such an invention, it is possible to move and remove contaminant ions to both sides and the center of the soil, thereby improving the efficiency of removing contaminants at low power, and dispersing the potential difference between electrodes to restore large-scale planting soil. Applicable.

Electrokinetics, soil restoration, electroosmotic, electrode, pollutant ion, electrophoresis

Description

Soil restoration system using electrokinetics and its method {ELECTROKINETIC SOIL RECOVERY SYSTEM AND METHOD THEREOF}

The present invention relates to an electrokinetic soil restoration system and method thereof, and more particularly to the formation of poles symmetrically around a positive electrode, thereby reducing the heavy metals and salt ions of the large-area cultivated soil with low voltage. The present invention relates to an electrodynamic soil restoration system and a method for removing and restoring the same.

Soil can be contaminated by various harmful substances such as heavy metals, phenols and oils. These soil contaminants accumulate in crops and contaminate groundwater, which eventually harms human health.

In order to solve this problem, electrokinetic contaminated soil restoration techniques have been studied a lot, and the basic principles will be described below.

Supplying direct current electricity to wet soil improves the desorption and dissolution of pore water to contaminants as it moves through the electrophoresis, electroosmosis, electrophoresis, and electrolysis of water. It increases the solubility and mobility of pollutants.

However, in high pH areas, such as soils near the cathode side, adsorption and precipitation reactions predominate, resulting in reduced mobility of contaminants. Contaminants in pore water are removed and removed from the soil by mechanisms such as electrophoresis, electroosmosis, and diffusion. Positively charged contaminants are transported to the cathode by complex transport mechanisms such as electrophoresis and electroosmosis. On the other hand, the electrophoresis of negatively charged contaminants is reduced by electroosmosis in the opposite direction.

Figure 1 shows the basic principle of the electrokinetic soil restoration technology. The strength of the electric field mainly applied to electrokinetic soil recovery techniques is 10-200 V / m (Prostein and Hicks, 1993), and the current density is 1-10 A / m ² . When the soil is restored by applying electrokinetic techniques, the movement direction and removal efficiency of pollutants are affected by various factors. The representative ones are pollutant concentration and mobility, soil type and structure, and pore fluid. Chemical reactions and electrical conductivity of pore fluids that occur at soil and soil interfaces (Virkutyte et al., 2002).

Most studies of electrokinetic techniques to date have demonstrated that the major contaminant removal mechanism is electrophoresis. However, a study to remove cadmium and lead from Milwhite kaolinite performed by Hsu (1997) and suggested that Kim et al. Could act as a dominant removal mechanism over electrophoretic mobility. When soils contaminated with heavy metals are restored using electrokinetic techniques, if the soil surface has a negative zeta potential, the electrophoresis of heavy metals is enhanced by electroosmosis, effectively removing heavy metal contaminants.

However, when the electrokinetic process is applied, the overall soil pH decreases as the acid wire generated at the anode moves. This decrease in pH increases the mobility of heavy metal contaminants, creating a favorable environment for heavy metal removal, but adversely affects heavy metal removal by reversing the electroosmotic direction by affecting the polarity of the zeta potential. Therefore, in order to effectively remove heavy metal contaminants, the pH should be kept as low as possible in order to increase the solubility, and at the same time, the pH should be adjusted as high as possible to maintain the negative zeta potential. Hydrogen ions produced at the anode move toward the cathode by means of electrophoresis, electroosmosis, diffusion, etc. These groups of hydrogen ions are called acid fronts.

As the premature lines move towards the cathode, they reduce the pH of the soil and dominate the desorption and dissolution of heavy metal contaminants in the soil. On the other hand, a group of hydroxide ions produced at the cathode form an alkaline or base front, and the base is moved toward the anode. In contrast to premature lines, base lines move in the soil, increasing the pH of the soil, and in particular, depositing heavy metal contaminants in soil close to the cathode side.

Therefore, the ante-conductor acts as an advantageous mechanism to remove the contaminants by converting heavy metal contaminants into a highly mobile form, but the base wire has an adverse effect on the removal of contaminants by adsorbing or sedimenting the contaminants in the soil. Go crazy. Of course, decreasing the pH of the soil can result in reduced electrostatic osmotic flow or reverse electroosmosis, which can interfere with the removal of heavy metal contaminants.

PH, ionic strength of pore water, pollutant characteristics (mobility, solubility, presence form), soil surface characteristics (charge characteristics, size and sign of zeta potential, cation exchange capacity) due to the movement of acid and base lines produced by electrolysis ) Is affected.

The ion mobility of hydrogen ions is about twice as large as that of hydroxide ions, and in the general case where the soil surface is negatively charged, the electrophoretic rate of hydrogen ions increases due to the electroosmotic increase by electroosmotic. Is much larger than hydroxide ions. Therefore, if the anode and cathode are not subjected to special chemical treatment, the ante and base wires move both from the soil to the cathode and the anode, but the movement of the ante wire in the soil predominates and the soil pH decrease is dominant.

Figure 2 is a block diagram showing a conventional electrokinetic contaminated soil purification system. As shown in FIG. 2, electrostatically contaminated soil purification cells 10 and electrostatically contaminated soil purification cells 10 for purifying electrodynamically contaminated soil by applying pulsed power to the contaminated soil are provided. Power supply device 20 for supplying pulsed power, and for supplying the electrolyte solution 32 to the electrokinetic contaminated soil purification cell 10

Applied to the electrolyte supply cell 30, the electrolyte recovery cell 40 for measuring and storing the electrolyte solution 32 recovered from the electrokinetic contaminated soil purification cell 10, and the electrokinetic contaminated soil purification cell 10 And measuring means 50 for monitoring the voltage and current and observing the waveform.

Referring to FIG. 2, the electrokinetic contaminated soil purification cell 10 is divided into a positive electrode cell P, a negative electrode cell N, and a contaminated soil cell 15. The positive electrode cell P has a concentration of the electrolyte in the positive electrode housing 12P and the positive electrode housing 12P for accommodating the electrolyte 32 so as to surround the positive electrode 11P and the positive electrode 11P, the conductor to which the positive voltage is applied. It consists of an electrolyte circulation pump (14P) to be constant, the cathode electrode cell (N) is a cathode housing (12N) for receiving the electrolyte 32 to surround the cathode (11N) and the cathode (11N), the cathode housing ( It consists of an electrolyte circulation pump 14N for making the density | concentration of electrolyte in 12N) constant.

Each of the cells P, N, and 15 is separated / connected into the porous cellulose membranes 13P and 13N which are easily permeable to the solution. ) Can be installed. That is, the anode electrode cell P and the contaminated soil cell 15 are separated / connected to the first porous cellulose membrane 13P which is easy to permeate the solution, and the cathode electrode cell N and the contaminated soil cell 15 are The permeability of the solution is easily separated / connected to the second porous cellulose membrane 13N.

The anode electrode cell P and the cathode electrode cell N can supply the electrolyte 32 separately, and the electrolyte can be maintained by the electrolyte cell 30 using the mariotte bottle. This prevents changes in chickenpox inclination.

In addition, in order to measure the drainage amount of the electrolyte 32 transferred from the anode 11P to the cathode 11N by the electroosmotic phenomenon, a drainage measuring cell 40 (recovery cell) is formed on the cathode, and the anode electrode cell ( In order to minimize the difference in ion concentration between P) and cathode electrode cell (N), electrolyte circulation pumps (14P) and (14N) are implemented, and the electrochemical characteristics (pH, conductivity) and heavy metal ion concentration of electrolytes are easily analyzed. I can do it.

As a power supply source for the positive electrode 11P and the negative electrode 11N, the pulse power supply device 20 is connected to use not only a pulse power supply but also a DC power supply, so that current and The information collecting device 53 is connected to measure the voltage automatically and transmit data to the computer.

That is, the measuring means 50 for measuring the power supply is the information collecting device 53 for collecting information from the voltmeter 51 and the ammeter 52 and the oscilloscope 55 receiving a signal from the probe 54 of the electrode. The power supply characteristics applied between the positive electrode 11P and the negative electrode 11N can be measured. In particular, in the case of the pulse power supply 20, a pulse waveform can be directly observed in an oscilloscope 55 through a separate probe for measuring voltage and current.

This conventional electrokinetic soil restoration system has a disadvantage in that the installation cost is increased to restore the soil by removing heavy metal ions or salt ions since the plantation soil for growing crops has a large area. In addition, since a high voltage causes heating (heating) to generate the same current output, a higher voltage needs to be applied, and therefore, a large amount of energy is required, and the removal efficiency of pollutant ions is reduced.

The problem to be solved by the present invention with respect to the above problem is to reduce the power consumption when the plantation area to be restored is large, to increase the removal efficiency by increasing the mobility of contaminated ions, as well as to lower the system cost It is to provide a soil restoration system and method using electrodynamics.

Means according to the present invention for solving the above problems is a soil purification system by the electrodynamics, the side electrode provided in the interior of the straight side channel formed on both sides of the plantation outside; A central electrode located at the center of the lower portion of the plantation and installed at an inner center of the straight central channel parallel to the side channel; And a power source capable of applying voltage or current to the positive and negative electrodes.

Here, it is preferable to further include a control means for controlling the moisture content of the plantation soil on the plantation top, the moisture content control means is a moisture content measuring device capable of measuring the moisture content of the soil and supplying water to the soil It is preferred to include a water jet.

In addition, preferably further comprises an ion concentration measuring means for measuring the concentration of ions contained in the soil of the plantation, it is preferable that the porous cellulose membrane is provided on the interface between the soil and the side and the central channel of the plantation. .

Preferably, the side and center channels have a depth of 0.3 to 0.5 m, and the side and center channels have a width of 0.5 to 1 m, and the positive electrode 110 includes at least one of stainless steel or metal oxide. It is preferable to set it as a material.

In addition, the voltage source is preferably capable of applying a positive and negative pulse voltage, AC and DC voltage, measuring the pH of the aqueous solution around the electrode, and the flow rate adjusting means for adjusting the electrolyte flow rate in accordance with the measured value It is preferable to further include, it is preferable to include a pH adjusting means for controlling the pH by alternating the polarity of the positive electrode when the pH between the measured positive electrode is more than a predetermined range.

On the other hand, the soil restoration method according to the present invention comprises the steps of (a) controlling the moisture of the soil under the plantation; (b) applying a voltage or current by forming electrodes at the center and both sides of the plantation outside; (c) moving, with the applied voltage, positive or negative ions dissolved in the soil underneath the plantation to a central or side electrode at the outer side channel or inner central channel of the plantation; And (d) discharging the ions introduced into the side or central channel with water.

Here, the step (a) is a step of measuring the moisture content value of the soil, and controlling the water content by spraying water on the soil by water injection means according to the measured moisture content value, the soil is salt accumulation As the soil, the positive or negative ions are preferably salt ions.

Furthermore, preferably, in the step (b), the voltage may be a mixture of positive and negative pulsed voltages, AC and DC voltages, and the step (c) may be performed by measuring the pH of the water channel in the electrolyte. It is preferable to include the step of adjusting the flow rate of.

In addition, the step (c) is a step of measuring the pH of the solution filled in the channel and when the difference between the measured pH of the positive electrode exceeds a predetermined range to apply a voltage or current by instantaneously alternating the polarity of the positive electrode It is preferred to include the step.

By providing such an invention, it is possible to move and remove contaminant ions to both sides and the center of the soil, thereby improving the efficiency of removing contaminants at low power, and dispersing the potential difference between electrodes to restore large-scale planting soil. Applicable.

In addition, it facilitates the movement of pollutants, eases the pH control by reducing the gradient of pH in the soil, and if the soil is dried by the heat of resistance of the soil, it may cause the resistance increase during ion migration, but AC, DC and By mixing and applying a positive / negative pulsed voltage, the ions adsorbed in the soil can be easily desorbed and moved to increase the removal efficiency and provide a rest period to prevent drying of the soil.

3 is a view illustrating a side configuration of a soil restoration system using the electrodynamics according to the present invention, Figure 4 is a view showing a plan view of the soil restoration system according to the present invention, Figure 5 is a flow chart of the restoration method Figure is an illustration. Hereinafter, a soil restoration system using electrodynamics and a method thereof will be described by comparing FIGS. 3, 4, and 5.

As shown in Figures 3 and 4, the soil restoration system forms a straight central channel 115 in the center of the plantation soil and a straight side channel 125 on the outer side of the plantation facility (e.g., plastic house) 133, One of the positive and negative electrodes is provided inside the central channel 115, and an electrode having a polarity opposite to that of the electrode provided in the central channel is installed in the side channel 125 to apply a current or a voltage.

That is, the system includes a central electrode 110, a side electrode 120, a power supply 150 for applying voltage / current, water content control means 130, 135, ion concentration measuring means, electrolyte flow rate adjusting means 140 to be. It is also possible to further include a pH adjusting means (not shown).

That is, the soil under the facility for growing crops, such as house, contains a large amount of heavy metals or salt ions due to various fertilizers or pesticides. Since these ions contaminate or damage the soil, which lowers the productivity and quality of the crop, it is intended to restore the soil through the system having the same configuration as the present invention.

Common soils include heavy metals, radioactive materials, inorganic pollutants such as toxic anions and organic pollutants such as acetic acid, petroleum hydrocarbons, halogens and non-halogen hydrocarbons, and salt ions. The present invention relates to a soil restoration system that removes detected salt ions (Ca 2+, Na +, K +, Cl −, NO 3, etc.), but of course, other contaminated ions can be removed.

As shown in FIG. 3, the soil restoration system using the electrodynamics according to the present invention forms a central channel 115 at the center of the soil below the plantation facility, and forms a side channel 125 at the outer side of the facility to form a central channel 115. The central electrode 110 is installed in the side, and the side channel 125 is provided with the side electrode 120 of the opposite polarity to the central electrode 110, and the moisture content is adjusted by allowing the planting soil to contain moisture. (S100) If the contaminated ions in the plantation soil are dissolved and dissociated, the voltage or storage is applied to the electrode (S200). Contaminated ions are restored to the soil by allowing the solution of the accumulated channel to be discharged (S400).

Such movement of ions is called electrophoresis, and electrophoresis is called electrophoresis, in which concentration gradients of ions are formed and electrophoresis is induced. That is, the system according to the present invention is a soil restoration system that removes contaminated ions by moving and accumulating contaminated ions around the electrodes of the anode or cathode by electrophoresis and electroosmotic, and discharging them together with water.

The central electrode 110 is an insoluble anode, preferably made of stainless steel or a metal oxide, which is difficult to oxidize because the electrode is in continuous contact with the electrolyte solution or water, and oxidation easily occurs. It is preferable to use an insoluble material, and the side electrode 120, which is a negative electrode, may use a metal such as iron, but since carbon is relatively less likely to be corroded than the anode, it is preferable to use carbon as a material. It is preferable in terms of durability.

Water content control means is composed of at least one water injection unit 130, and a water content measuring device 135, the water content measuring device 135 measures the water content of the soil, the water is not the most efficient water content range By allowing water to be supplied through the injection unit 130, the moisture content of the soil may be controlled. That is, a certain amount of water is present in the soil, so it is possible to control the moisture content and permeability control in the soil to dissolve the ions adsorbed on the surface of the soil in the liquid phase to be moved by the electric field.

Here, the water injection unit can be sprayed by being located on the top of the soil as shown in FIG. 3, and can be sprayed by installing a porous pipe inside the soil (not shown).

The main soil properties that affect the efficiency of the electrokinetic soil restoration process are chemical, mineralogy, structural properties, zeta potential, and water content. The water content (saturation) influences the electroosmotic flow rate. This affects process efficiency. During the electrokinetic process, negative pore pressures may occur, resulting in areas where the distribution of pore water in the soil is irregular or where consolidation occurs. Negative pore pressure can be caused by irregular electric osmotic flow as the pH, field strength, and zeta potential change locally in the soil.

Such irregular water content distribution of the soil not only increases the electrical resistance in the soil, but also adversely affects the movement of pollutants, thus affecting the process efficiency. In the present invention, the moisture content and distribution are appropriately controlled through the moisture content control means. It is possible to increase the efficiency of pollutant ion removal.

As shown in Figure 3, the ion concentration measuring means for measuring the concentration of ions contained in the cultivated soil further comprises a means for measuring the concentration of contaminated ions, because the concentration affects the removal efficiency It is configured to measure and control.

If the concentration of pollutant ion (i.e., the concentration of pollutant) is more than the soil adsorption capacity or ion exchange capacity, the removal efficiency is high, but the concentration of pollutant is low, so the mobility is increased If is lower, the process efficiency is reduced. Process efficiency depends not only on the concentration of pollutants to be removed, but also on the concentrations of other species present in the soil. If the concentration of the non-removable species is higher than the concentration of the pollutant to be removed, the electrical efficiency of the pollutant is reduced, and thus the removal efficiency of the pollutant to be removed is reduced.

Therefore, by providing an ion concentration measuring means for measuring the concentration of contaminated ions of the plantation soil connected to the terminal 155 shown in Figure 3 it is possible to increase the electrical efficiency and removal efficiency.

As shown in FIG. 3, the central electrode 110 is installed in the central channel 115 at the center of the plantation soil, and the side electrode 120 is installed in the outer channel of the plantation soil. The adjacent surface of the cellulose membrane 127 is easily connected to the permeability of the solution is separated and, in some cases, the ion exchange membrane may be mounted on the front surface (electrode cell direction) of the cellulose membrane 127. By doing so, the mobility of the ions can be increased to increase the removal efficiency.

Moreover, it is preferable that the width of each channel is 0.5 m-1 m, and it is preferable that the depth of a channel is 0.3 m-0.5 m. By forming a channel having such a depth and width, it is possible to efficiently remove and drain the contaminated ions transferred to the electrode. Of course, depending on the area of the plantation or the nature of the soil can have a suitable depth and width of the channel.

In addition, an electrolyte flow rate control means is provided to appropriately control the pH of the electrolyte filling around both electrodes 110 and 120, which controls the pH and the zeta potential and increases the desorption reaction for the purpose of increasing the mobility of contaminating ions. This is because it is possible to control the flow rate of the electrolyte of the positive and negative electrolyte solution in order to promote the increase and increase the electroosmotic flow rate.

In addition, when a voltage or current is applied to the anode and the cathode, the pH is increased at the cathode and the pH is decreased at the anode. In the present invention, when the pH gradient is increased, by controlling the pH by alternating the polarities of the anode and the cathode, contamination The mobility and removal efficiency of ions can be improved. That is, the pH is measured by measuring the pH of the solution filled in the channel through the pH measurement means, and when the difference in the pH of the measured positive electrode is more than a certain range by changing the polarity of the positive electrode to drop the concentration gradient.

On the other hand, as shown in Figure 3, the central electrode 110 and the side electrode 120, the power supply 150 that can apply the current or voltage is connected to the electrode, the application of the appropriate voltage or current is ampere Through the ampere meter (A) and the voltage meter (V), it is possible to apply a voltage or current having the highest removal efficiency.

The power supply 150 shown in FIG. 3 is a device capable of applying a DC voltage as well as a pulsed voltage and an AC voltage. It is common to apply DC voltage or current in the soil restoration system using conventional electrodynamics. However, when the area of the cultivated soil to be restored is large, high power is required, and the moving speed in the soil of pollutant ion is slow. there was.

In order to improve this point, as an embodiment according to the present invention, by mixing the positive / negative pulse type voltage, the DC voltage, and the AC voltage, the waveform shown in FIG. Removal rate efficiency can be increased.

In other words, in the case of the conventional DC or pulse, the voltage or current is supplied in one direction, and the pulse is a current on / off concept, which is known to have the effect of reducing energy and shortening time than supplying only DC. In the embodiment of the invention, by combining the pulse and DC / AC, patterning it to maximize the efficiency. As shown in FIG. 6, the positive / negative pulse type voltage, the DC type voltage, and the AC type voltage are sequentially applied to increase the energy efficiency and the removal efficiency. The pattern of the applied voltage illustrated in FIG. 6 is only one example, and the pattern is not limited.

In detail, if the polarizer is kept at one polarity by applying a conventional DC voltage, by-products are generated around the electrodes (particularly, the cathode), which may interfere with the flow of current, thereby acting as a factor of increasing the resistance. By applying a reverse pulse or AC as in the embodiment of the by-products can be suppressed, it is also effective to remove the generated by-products.

Therefore, providing the present invention facilitates the movement of pollutants, eases the pH control by reducing the gradient of pH in the soil, and may cause a rise in resistance when the soil is dried by the resistance heat of the soil. However, by applying AC or pulsed voltage, it is possible to provide a rest period to prevent drying of the soil.

As such, the soil restoration system and method using the electrodynamics according to the present invention can remove the contaminated ions from both the center and the center of the soil, rather than the conventional two-electrode structure, to remove the removal efficiency at low power. In addition, by dispersing the potential difference between the electrodes it can be applied to the restoration of large-area plantation soil.

In the above, the preferred embodiments of the present invention have been described, but the present invention is not limited to the above-described embodiments and drawings, and the general knowledge in the technical field to which the present invention belongs without departing from the technical spirit of the present invention. Since various changes and modifications may be made by those having the scope of the present invention, the scope of the present invention should be determined by the appended claims and their equivalents.

1 is a diagram schematically showing the basic principle of the electrokinetic soil restoration technology,

Figure 2 is a block diagram showing a conventional electrokinetic soil recovery system,

3 is a diagram illustrating a side configuration of a soil restoration system using electrodynamics according to the present invention;

4 is a diagram illustrating a plan view of the soil restoration system according to the present invention;

5 is a view illustrating a flowchart of a soil restoration method according to the present invention;

FIG. 6 is a view illustrating a waveform in which voltage is applied according to an embodiment of the present invention, in which a pulse type voltage, a DC voltage, and an AC voltage are mixed.

[Description of main part of drawing]

100 soil, 110 central electrode, 115 central channel, 120 side electrode

125: side channel, 127: porous cellulose membrane 130: water jet,

133: plantation facility 135: water content measuring device, 150: power, 155: terminal

Claims (17)

In the soil purification system by electrokinetics, A side electrode having a positive or negative polarity installed inside a straight side channel formed outside both sides of the plantation; A central electrode located in the center of the lower part of the plantation and having a polarity opposite to that of the side electrode installed in the inner center of the straight central channel parallel to the side channel; It includes a power source for applying a voltage or current to the center electrode and the side electrode, Soil recovery system using the electrodynamics, characterized in that it further comprises a moisture content control means for controlling the moisture content of the cultivated soil. delete The method of claim 1, The water content control means is a soil moisture recovery system using an electrokinetic, characterized in that it comprises a water content measuring device capable of measuring the water content of the soil and the water injection unit for supplying water to the soil. The method of claim 1, The soil restoration system using the electrokinetics, characterized in that it further comprises an ion concentration measuring means for measuring the concentration of ions contained in the soil of the plantation. The method of claim 1, Soil restoration system using electrodynamics, characterized in that the porous cellulose membrane is provided on the interface between the soil and the side and the central channel of the plantation. The method of claim 1, The side and the central channel is a soil restoration system using electrodynamics, characterized in that the depth of 0.3m to 0.5m. The method of claim 1, Soil restoration system using electrodynamics, characterized in that the width of the side and the central channel is 0.5m to 1m. The method of claim 1, The electrode having a positive polarity of the electrode is a soil restoration system using electrodynamics, characterized in that at least one material of stainless steel or metal oxide. The method of claim 1, The voltage source is a soil restoration system using electrodynamics, characterized in that the application of positive and negative pulsed voltage, AC and DC voltage. The method of claim 1, And a flow rate adjusting means for measuring a pH of the aqueous solution surrounding the electrode and adjusting the flow rate of the electrolyte according to the measured value. The method of claim 1, PH adjusting means for measuring the pH of the aqueous solution surrounding the electrode, and adjusts the pH by alternating the polarity of the positive and negative electrodes when the difference in pH between the measured positive and negative electrodes exceeds a predetermined range Soil restoration system using an electrodynamics comprising a. (a) controlling the moisture of the soil under the plantation; (b) applying a voltage or current by forming electrodes at the center and both sides of the plantation outside; (c) moving, with the applied voltage, positive or negative ions dissolved in the soil underneath the plantation to a central or side electrode at the outer side channel or inner central channel of the plantation; And (d) discharging the ions introduced into the side or central channel with water, The step (a) is a step of measuring the moisture content of the soil, and controlling the water content by spraying water on the soil by at least one water injection means according to the measured moisture content value using the electrodynamics Soil purification method. delete The method of claim 12, Wherein said soil is a salt accumulation soil, and said positive or negative ions are salt ions. The method of claim 12, In the step (b), the voltage is a soil purification method using electrodynamics, characterized in that the application of a mixture of positive and negative pulse type, AC and DC voltage. The method of claim 12, The step (c) is the soil purification method using the electrodynamics, characterized in that for adjusting the flow rate of the electrolyte by measuring the pH of the waterway. The method of claim 12, Measuring the pH of the solution around the electrode and applying a voltage or a current by alternating the polarity of the anode when the difference in pH between the measured positive and negative electrodes exceeds a predetermined range Soil purification method using the electrodynamics characterized in that.

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