KR20140006127A - Soil purification system capable of recycling spilled water - Google Patents

Soil purification system capable of recycling spilled water Download PDF

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Publication number
KR20140006127A
KR20140006127A KR1020120067776A KR20120067776A KR20140006127A KR 20140006127 A KR20140006127 A KR 20140006127A KR 1020120067776 A KR1020120067776 A KR 1020120067776A KR 20120067776 A KR20120067776 A KR 20120067776A KR 20140006127 A KR20140006127 A KR 20140006127A
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KR
South Korea
Prior art keywords
effluent
unit
soil
purification
anode
Prior art date
Application number
KR1020120067776A
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Korean (ko)
Inventor
최정희
김두헌
이유진
김성철
심성주
이현구
하태현
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한국전기연구원
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Priority to KR1020120067776A priority Critical patent/KR20140006127A/en
Publication of KR20140006127A publication Critical patent/KR20140006127A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/08—Reclamation of contaminated soil chemically
    • B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4696—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrophoresis

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Soil Sciences (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The present invention relates to a soil purification system capable of recycling effluent. More specifically, the present invention relates to a soil purification apparatus capable of recycling effluent that can recycle effluents by-produced during soil clarification using electrodynamics. The present invention is an anode inserted into the contaminated soil; A cathode positioned in the contaminated soil so as to face the anode; a power supply unit supplying power to the anode and the cathode; An effluent collecting part having an upper surface spaced downward with respect to the lower surface of the negative electrode and collecting effluent flowing into the negative electrode by electric osmosis; And an effluent purification unit disposed above the contaminated soil and configured to purify after receiving the effluent collected in the effluent collection unit. According to the present invention can be supplied to the contaminated soil after purifying the effluent to be discharged during the soil purification process using electrokinetics, so a separate water supply device is not required, so the soil purification system can be configured more economically, containing pollutants Since the effluent is not discharged, it is possible to prevent environmental pollution such as secondary pollution of groundwater and surrounding soil.

Description

Soil purification system capable of recycling spilled water

The present invention relates to a soil purification system capable of recycling effluent. More specifically, the present invention relates to a soil purification apparatus capable of recycling effluent that can recycle effluents by-produced during soil clarification using electrodynamics.

Electrokinetics refers to a technique that uses physico-chemical phenomena such as electroosmosis, electrophoresis, and ionic migration caused by applying a direct current between an anode and a cathode buried in soil. do.

When direct current is applied between the anode and cathode embedded in soil based on electrokinetics, electrolysis occurs at the anode and cathode, and H + and OH - are generated between the two electrodes. H + moves to the cathode and OH − moves to the anode by using a potential gradient.

At this time, since the mobility of H + is larger than that of OH − , the area expansion of the acid front is faster than the area expansion of the base front, so that the area where the soil is acidified becomes wider. Since the heavy metal adsorbed on the particle surface is present in the pore water in the form of ions, the heavy metal can be easily moved to the cathode under the influence of an electric field.

In addition, since the heavy metal moving around the cathode is precipitated on the surface of the cathode or combined with the surrounding OH - group to precipitate as a hydroxide, the heavy metal can be easily removed by removing the cathode electrode or digging only soil near the cathode. Compared with the existing contaminant removal method, it is very economical.

Accordingly, when the soil purification is performed using electrodynamics, contaminants such as heavy metals, radioactive substances, and organic substances contained in the soil can be removed individually, and they can be efficiently used in mixed soils mixed with them. In addition, it is also possible to effectively remove salts and contaminated colloids that are accumulated in facility cultivation or reclaimed land.

As such, the soil purification technology using electrodynamics is efficient when applied to fine soil rather than large grains, and can be applied to various kinds of pollutants, and it is economical according to the easy treatment of pollutants in the field. This has the advantage of being secured.

In general, in the case of the soil purification technology using electrodynamics, the water contained in the soil is moved to the cathode side by the electroosmotic process during the soil purification process. This is called effluent, and in the case of the effluent, organic pollutants, pesticides, solids, various heavy metals, and Since it contains pollutants such as salt ions, when discharged as it is, it causes environmental pollution such as soil secondary pollution or groundwater pollution.

In addition, in order to apply the soil purification technology using electrodynamics, a certain amount of moisture must be included in the contaminated soil. Therefore, a conventional water supply device for continuously supplying moisture in the contaminated soil is required. there was.

The present invention has been made to solve the above problems by applying the method to purify the effluent by-produced in the soil purification process using electrokinetics and then supply to the soil side, so that the effluent recycling is not required for a separate water supply device It is an object to provide a purification system.

A soil purification system capable of recycling effluent according to the present invention for achieving the above object is an anode inserted into the contaminated soil; A cathode positioned in the contaminated soil so as to face the anode; A power supply unit supplying power to the positive electrode and the negative electrode; An effluent collecting part having an upper surface spaced downward with respect to the lower surface of the negative electrode and collecting effluent flowing into the negative electrode by electric osmosis; And an effluent purification unit disposed above the contaminated soil and configured to purify after receiving the effluent collected in the effluent collection unit.

In addition, the effluent purification unit may include an ozone treatment unit for ozone treatment of the effluent flowing into the effluent purification unit, and an ion removal unit for removing ionic contaminants contained in the effluent passing through the ozone treatment unit.

In addition, the effluent purification unit is disposed between the ozone treatment unit and the ion removal unit to remove the solids contained in the effluent water, the organic compound contained in the effluent water disposed behind the ion removal unit and passed through the ion removal unit It may further include a photocatalyst treatment to remove the.

The apparatus may further include a water supply unit configured to supply the effluent passing through the effluent purification unit to the contaminated soil side according to a predetermined cycle.

In addition, the water supply unit may further include a pump for supplying the effluent passing through the effluent purification unit to the water supply unit.

In addition, the positive electrode and the negative electrode may be provided in the form of a rod, mesh, strip, or plate.

The apparatus may further include an operation controller for controlling the operation of the power control unit and the water supply unit.

The power supply unit may supply power in a form of DC, pulse, DC and pulse, or AC and pulse mixed to the anode and the cathode under the control of the operation controller.

According to the present invention can be supplied to the contaminated soil after purifying the effluent to be discharged in the soil purification process using electrokinetics, there is no need for a separate water supply device has an effect that can be more economically configured soil purification system.

In addition, since the effluent can be purified and supplied to the contaminated soil side, it has an effect of preventing environmental pollution such as secondary pollution of groundwater and surrounding soil by unpurified effluent.

1 is a cross-sectional view of a soil purification system capable of recycling runoff according to a preferred embodiment of the present invention;
2 is a detailed block diagram of the outflow water purification unit of FIG. 1;
3 is a cross-sectional view of the outflow water purification unit of FIG.
4 is a plan view of a soil purification system capable of recycling runoff according to a preferred embodiment of the present invention, and
5 is a graph of output voltage waveforms of the power supply of FIG. 1.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. Further, the preferred embodiments of the present invention will be described below, but it is needless to say that the technical idea of the present invention is not limited thereto and can be practiced by those skilled in the art.

1 is a cross-sectional view of a soil purification system capable of recycling runoff according to a preferred embodiment of the present invention.

As shown in FIG. 1, a soil purification system 1 capable of recycling effluent according to an exemplary embodiment of the present invention includes an anode 10, a cathode 20, a power supply unit 30, an effluent collection unit 40, and effluent water. And a purifying unit 50 and a water supply unit 60.

The anode 10 is inserted into the contaminated soil S, and the cathode 20 is located in the contaminated soil S so as to face the anode 10 inserted into the contaminated soil S.

In this case, the anode 10 and the cathode 20 may be in the form of a rod, a mesh, a strip, or a plate.

The power supply unit 30 is electrically connected to the positive electrode 10 and the negative electrode 20 and supplies power to the positive electrode 10 and the negative electrode 20 so as to purify the contaminated soil S based on the electrodynamics.

In this case, the power supplied from the power supply unit 30 to the positive electrode 10 and the negative electrode 20 may be a DC, pulse, or a mixture of DC and pulse.

The effluent collecting unit 40 is spaced downwardly with respect to the lower surface of the negative electrode 20 and collects effluent flowing into the negative electrode 20 by electric osmosis and then supplies the effluent purification unit 50.

At this time, the supply amount of the collected effluent supplied from the effluent collection unit 40 to the effluent purification unit 50 may be determined according to the purification rate of the effluent purification unit 50 predetermined.

The effluent purification unit 50 is disposed above the contaminated soil S and receives the effluent W collected in the effluent collection unit 40 to purify the effluent so that the effluent can be recycled.

In this case, the effluent purification unit 50 may further include a pump for receiving the effluent water W that has passed through the effluent collection unit 40, and the detailed configuration of the effluent purification unit 50 will be described below with reference to FIGS. 2 and 3. It will be described in more detail with reference to.

The water supply unit 60 supplies the polluted soil S at a predetermined cycle after receiving the effluent W4 purified by the effluent purification unit 50.

At this time, the predetermined period is in the polluted soil (S) to enable to clean the polluted soil (S) on the basis of electrokinetics according to the supply of the purified effluent (W4) from the water supply unit 60 to the polluted soil (S) side. In order to facilitate the movement of ions and soil pore water in the can be a predetermined cycle.

At this time, the water supply unit 60 may further include a pump for receiving the effluent W4 passed through the effluent purification unit 50.

In addition, although not shown in FIG. 1, the soil purification system 1 capable of recycling the effluent according to the preferred embodiment of the present invention may control operation of the power supply unit 30, the effluent purification unit 50, and the water supply unit 60. It may further include a possible operation control.

2 is a detailed block diagram of the outflow water purification unit of FIG. 1 and FIG. 3 is a cross-sectional view of the outflow water purification unit of FIG. 1.

As shown in FIG. 2 and FIG. 3, the effluent purification unit 50 includes an ozone treatment unit 51, a precipitation unit 53, an ion removing unit 55, and a photocatalyst treatment unit 57.

The ozone treatment unit 51 ozones the effluent W flowing into the effluent purification unit 50, and the precipitation unit 53 removes the solids contained in the effluent W1 passing through the ozone treatment unit 51.

At this time, the chemical oxygen demand (COD) and the biochemical oxygen demand (BOD) of the effluent W flowing into the effluent purification unit 50 by the ozone treatment unit 51 may be reduced. The precipitation unit 53 may remove the solids contained in the effluent W1 passed through the ozone treatment unit 51 in a manner of submerging the solids contained in the effluent W1 passed through the ozone treatment unit 51.

The ion removing unit 55 removes the ion contaminants contained in the effluent W2 passing through the settling unit 53, and the photocatalyst processing unit 57 is disposed in the effluent W3 passing through the ion removing unit 55. Remove organic compounds such as pesticides contained.

At this time, the ion removal unit 55 may remove the cation contaminants and the anion contaminants contained in the effluent (W2) passing through the settling unit 53 is disposed at each predetermined interval of the cation exchange resin and the anion exchange resin. In addition, the photocatalytic treatment unit 57 may remove organic compounds such as pesticides by applying ultraviolet rays to photocatalysts such as TiO 2 and using a strong oxidizing power of hydroxyl groups (OH Radical) generated accordingly.

In addition, the purification result of the effluent water W supplied to the effluent purification unit 50 from the effluent collection unit 40 by the operation of the effluent purification unit 50 according to the preferred embodiment of the present invention is shown in the following table. Can be.

Analysis item W W1 W2 W3 COD Cr (mg / L) 230.0 116.0 45.5 2.5 BOD (mg / L) 75.0 18.0 12.8 9.6 COD Mn (mg / L) 124.3 54.7 33.7 1.6 T-N (mg / L) 124.3 54.7 33.7 1.6 SS (mg / L) 314.529 303.508 284.234 0.328 SO 4 2 (mg / L) 1286.9 410.0 16.0 2.0 NO 3 -N (mg / L) 88.931 108.832 126.772 0.014 PO 4 -P (mg / L) 0.024 0.035 0.010 0.008 K (mg / L) 513.393 552.695 529.729 Not detected Ca (mg / L) 655.355 614.159 546.696 0.359 Na (mg / L) 1077.64 1148.95 1104.08 0.191 Mg (mg / L) 244.195 272.543 240.429 0.078 Fe (mg / L) 131.408 0.641 3.602 0.009 Cd (mg / L) 0.011 0.007 0.006 Not detected Cr (mg / L) 0.023 0.022 0.039 Not detected

Here, W is the effluent supplied from the effluent collection unit 40 to the effluent purification unit 50, W1 is the effluent passing through the ozone treatment unit 51 of the effluent purification unit 50, W2 is the effluent purification unit 50 The effluent passing through the settling section 53, and W3 means the effluent passing through the ion removal unit 55 of the effluent purification unit 50, purifying the effluent from the effluent collection unit 40 as shown in Table 1 In case of the effluent passed through the ozone treatment unit 51, the precipitation unit 53, and the ion removal unit 55 after being supplied to the unit 50, the chemical oxygen demand (COD) and the biochemical oxygen demand (Biochemical) Oxygen Demand (BOD) is reduced, and solids, cationic contaminants, and anionic contaminants have been removed.

4 is a plan view of a soil purification system capable of recycling runoff according to a preferred embodiment of the present invention, and FIG. 5 is a graph of an output voltage waveform of the power supply unit of FIG. 1.

As shown in FIG. 4, the soil purification system 1 capable of recycling the effluent according to the preferred embodiment of the present invention is characterized by electrodynamics after installing a plurality of anodes 10 and cathodes 20 in the contaminated soil S. FIG. From the power supply unit 30 electrically connected to the plurality of positive electrode 10 and the negative electrode 20 to purify the contaminated soil (S) based on the side of the positive electrode 10 and the negative electrode 20 as shown in FIG. Supply power in the form of direct current, pulse, direct current and pulse, or a mixture of alternating current and pulse.

After the water supply unit 60 receives the effluent water W4 introduced into the cathode 20 and collected by the effluent collecting unit 40 and then purified by the effluent purification unit 50, the contaminant soil S is pre-contaminated. Water (that is, effluent W4 purified by the effluent purification unit 50) can be supplied according to the determined cycle.

In addition, the operation control unit 70 may be a type of power supplied from the power supply unit 30 (that is, a form of DC, pulse, DC and pulse, or AC and pulse mixed), operation of the effluent purification unit 50, Alternatively, the water supply cycle and the supply amount to the contaminated soil S side of the water supply unit 50 may be controlled.

The soil purification system 1 capable of recycling the effluent may move toward the cathode 20 as power is supplied from the power supply unit 30 to the anode 10 and the cathode 20 side for soil purification using electrodynamics. The effluent (W) containing contaminants such as organic pollutants, pesticides, or solids is collected by the effluent collection unit 40 and purified by the effluent purification unit 50, and the purified effluent W4 is then supplied to a water supply unit. 60) may be supplied to the contaminated soil (S) side according to a predetermined cycle after receiving.

Therefore, unlike a conventional soil purification system using electrodynamics, a separate water supply device is not required, so that the soil purification system using electrodynamics can be more economically configured.

In addition, since the effluent can be purified and supplied to the contaminated soil, an eco-friendly zero discharge system for the effluent containing contaminants can be implemented to prevent environmental pollution such as secondary pollution of groundwater and surrounding soil by unpurified effluent. It becomes possible.

The above description exemplifies the technical idea of the present invention, and various modifications, changes, and substitutions may be made by those skilled in the art without departing from the essential characteristics of the present invention. . Therefore, the embodiments disclosed in the present invention and the accompanying drawings are intended to illustrate and not to limit the technical spirit of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments and the accompanying drawings . The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents thereof should be construed as being included in the scope of the present invention.

(1): Soil purification system for effluent recycling (10): Anode
20: cathode 30: power supply
40: effluent collection unit 50: effluent purification unit
(51): ozone treatment unit (53): sedimentation unit
55: ion removal unit 57 photocatalyst processing unit
60: water supply unit 70: operation control unit

Claims (8)

Anode inserted in contaminated soil;
A cathode positioned in the contaminated soil so as to face the anode;
A power supply unit supplying power to the positive electrode and the negative electrode;
An effluent collecting part having an upper surface spaced downward with respect to the lower surface of the negative electrode and collecting effluent flowing into the negative electrode by electric osmosis; And
And an effluent purification unit disposed above the contaminated soil and configured to purify after receiving the effluent collected in the effluent collecting unit. The method of claim 1,
The effluent purification unit,
And an ion removing unit for ozone treating the effluent flowing into the effluent purification unit, and an ion removing unit for removing ionic contaminants contained in the effluent passing through the ozone treating unit. 3. The method of claim 2,
The effluent purification unit,
A precipitation unit disposed between the ozone treatment unit and the ion removing unit to remove solids contained in the effluent, and a photocatalyst processing unit disposed at the rear of the ion removing unit to remove organic compounds contained in the effluent passing through the ion removing unit. A soil purification system capable of recycling runoff, characterized in that it further comprises. The method of claim 1,
And a water supply unit for supplying the effluent that has passed through the effluent purification unit to the contaminated soil side according to a predetermined cycle. 5. The method of claim 4,
The water supply unit is a soil purification system capable of recycling the effluent, characterized in that it further comprises a pump for supplying the effluent passing through the effluent purification unit to the water supply side. The method of claim 1,
The anode and the cathode is a soil, effluent recycling system characterized in that provided in the form of a rod, mesh, strip, or plate. 5. The method of claim 4,
And a control unit for controlling the operation of the power control unit and the water supply unit. 8. The method of claim 7,
And the power supply unit supplies power in a form of direct current, pulse, direct current and pulse, or a mixture of alternating current and pulse to the anode and the cathode by the control of the operation controller.
KR1020120067776A 2012-06-25 2012-06-25 Soil purification system capable of recycling spilled water KR20140006127A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112676327A (en) * 2020-12-04 2021-04-20 北京建筑大学 System and method for repairing arsenic-polluted soil through electric auxiliary leaching stabilization

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112676327A (en) * 2020-12-04 2021-04-20 北京建筑大学 System and method for repairing arsenic-polluted soil through electric auxiliary leaching stabilization

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