CN213001807U - Electrodynamic device for repairing soil heavy metal pollution - Google Patents
Electrodynamic device for repairing soil heavy metal pollution Download PDFInfo
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- CN213001807U CN213001807U CN202021427878.0U CN202021427878U CN213001807U CN 213001807 U CN213001807 U CN 213001807U CN 202021427878 U CN202021427878 U CN 202021427878U CN 213001807 U CN213001807 U CN 213001807U
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Abstract
The utility model discloses an electrodynamic device for restoreing soil heavy metal pollution, include: two reaction well pipes, which are a cathode reaction well pipe and an anode reaction well pipe, and are provided with an upper part above the ground water surface and a lower part with a certain depth below the ground water surface, wherein the pipe wall of the lower part is provided with a plurality of perforations so that the ground water can penetrate into the reaction well pipes; the two reaction electrodes are a cathode electrode and an anode electrode which are respectively arranged below the underground water surface in the cathode reaction well pipe and the anode reaction well pipe, wherein the cathode electrode is electrically connected with the cathode of the direct current power supply through a first lead, and the anode electrode is electrically connected with the anode of the direct current power supply through a second lead; and the cation permselective membrane column is arranged in the cathode reaction well pipe and sleeved outside the cathode electrode so as to enable hydrogen ions and heavy metal ions in the underground water to pass through the cathode reaction well pipe in a single direction and enter the cathode reaction well pipe. The utility model has the advantages of simple structure, easy construction and installation, low construction and maintenance cost.
Description
Technical Field
The application relates to the technical field of soil improvement and remediation, in particular to an electrodynamic device for remediating heavy metal pollution of soil.
Background
Soil is an important material foundation for production activities of human society, and is an indispensable natural resource difficult to regenerate. At present, the soil environment pollution of China is more and more serious, and the pollution situation is very severe. Along with the rapid development of economic construction in China and the increasing improvement of the living standard of people, the pollution treatment problem of soil, water and the like brought by serious pollution industries such as heavy industry, chemical industry and the like is followed.
The increase of the polluted land seriously restricts the economic development, how to repair the polluted land, and the repaired up-to-standard land is put into the government planning development again, which is a way of the current economic development. When waste water and solid waste generated in the industrial production process enter soil, soil and underground water are polluted, and when the site is changed into residential, agricultural and other sites, soil and underground water must be repaired to eliminate pollutants in the soil and underground water.
The conventional soil remediation technologies include solidification/stabilization remediation, chemical leaching remediation, high-temperature incineration remediation, electrodynamics remediation and the like, but various remediation technologies have respective disadvantages, such as severe influence on the ecological environment of the soil structure and underground water, very high cost, very slow remediation process, low efficiency, incapability of meeting the requirement of rapid remediation, difficulty in delivering active microorganisms, auxiliary agents and the like required by remediation to polluted areas and the like.
The electrodynamic remediation technology can be used for remedying polluted soil and underground water without destroying the ecological environment, and is characterized in that direct current (a few amperes per square meter) is applied to the soil, under the combined action of electrolysis, electromigration, diffusion, electroosmosis, electric pulse and the like, ions in a soil solution are enabled to directionally move in an electric field under the action of low-strength direct current, soil pollutants are enriched or collected near an electrode, and then the soil pollutants are removed by other methods (electroplating, precipitation/coprecipitation, extraction, ion exchange resin and the like).
At present, the soil remediation device adopting the electrodynamic remediation technology is complex in structure and limited in treatment capacity (for example, a device for remediating polluted soil by utilizing the electrodynamic force, CN 201320430939), and is difficult to be suitable for the remediation treatment of large-volume soil in practical application.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides an electrodynamic device suitable for a large amount of heavy metal pollution soil of handling, it has simple structure, easily construction installation, and construction and maintenance cost are low advantage is favorable to the popularization and application of electrodynamic repair technique in the environmental protection field. The utility model discloses an electrodynamic device includes:
two reaction well pipes, which are a cathode reaction well pipe and an anode reaction well pipe, and are provided with an upper part above the ground water surface and a lower part with a certain depth below the ground water surface, wherein the pipe wall of the lower part is provided with a plurality of perforations so that the ground water can penetrate into the reaction well pipes;
the two reaction electrodes are a cathode electrode and an anode electrode which are respectively arranged below the underground water surface in the cathode reaction well pipe and the anode reaction well pipe, wherein the cathode electrode is electrically connected with the cathode of the direct current power supply through a first lead, and the anode electrode is electrically connected with the anode of the direct current power supply through a second lead;
and the cation permselective membrane column is arranged in the cathode reaction well pipe and sleeved outside the cathode electrode so as to enable hydrogen ions and heavy metal ions in the underground water to pass through the cathode reaction well pipe in a single direction and enter the cathode reaction well pipe.
In some embodiments, the upper part of the cathode reaction well pipe is provided with a cathode pipe cap in a sealing way, and the cathode pipe cap is provided with a cathode emptying pipe in a penetrating way for exhausting gas inside the cathode reaction well pipe; and/or
The anode reaction well pipe is provided with an anode pipe cap in a sealing way at the upper part, and the anode pipe cap is penetrated with an anode emptying pipe for discharging gas in the anode reaction well pipe.
In some embodiments, the first lead is sheathed with a first sleeve, and the first sleeve passes through the cathode cap and is sealed with the cathode cap; and/or the second sleeve is sleeved outside the second lead and penetrates through the anode tube cap and is sealed with the anode tube cap.
In some embodiments, the opening of the cation permselective membrane column is further provided with a fastener comprising:
the fixing hole is used for penetrating and fixing the first sleeve; and
and the plurality of air holes are used for discharging air.
In some embodiments, further comprising: the cathode gas collecting unit is communicated with the cathode emptying pipe and is used for collecting and pumping gas in the cathode reaction well pipe; and/or the presence of a gas in the gas,
and the anode gas collecting unit is communicated with the anode emptying pipe and is used for pumping gas in the anode reaction well pipe.
In some embodiments, the lower portion of the reaction well tubular is between 1 meter and 2 meters deep below the surface of the subterranean water.
In some embodiments, the wall of the reaction well tubing has perforations with a pore size between 8mm and 12 mm.
In some embodiments, the material of the reactive portions of the cathode and anode electrodes is graphite.
In some embodiments, the first sleeve and the second sleeve are made of polyvinyl chloride or polyethylene.
In some embodiments, the reaction well pipe, and/or the cathode and anode evacuated tubes are made of high density polyethylene.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is a schematic structural view of the fastener of the present invention;
fig. 3 is a schematic view of the interface structure at a-a in fig. 2.
Symbolic illustration in the drawings:
100 groundwater level;
200, the ground;
1, a direct current power supply;
21 a cathode electrode;
22 an anode electrode;
3, a reaction well pipe;
31 a cathode reaction well pipe;
311 lower part;
312 cathode tube caps;
313 cathode evacuation tube;
32 anode reaction well pipes;
321 lower part;
322 an anode cap;
323 an anode emptying pipe;
41 air pump;
42 a gas collection system;
5 a cation permselective membrane column;
6, fastening pieces;
61 fixing holes;
62, air holes;
7 a first sleeve;
70 a first conductive line;
8 a second sleeve;
80 second conductive lines.
Detailed Description
The technical features of the present invention are described in the following by specific embodiments with reference to the accompanying drawings:
example 1
The embodiment provides an electrodynamic device for remediating heavy metal contaminated soil, comprising:
two reaction well pipes 3, which are a cathode reaction well pipe 31 and an anode reaction well pipe 32, respectively, having an upper portion above the groundwater level 100 and a lower portion below the groundwater level 100 to a certain depth, wherein the pipe walls of the lower portion 311 of the cathode reaction well pipe and the lower portion 321 of the anode reaction well pipe have a plurality of perforations (not shown) to allow groundwater to penetrate into the cathode reaction well pipe 31 and the anode reaction well pipe 32;
two reaction electrodes, namely a cathode electrode 21 and an anode electrode 22, which are respectively arranged below the underground water surface 100 in the cathode reaction well pipe 31 and the anode reaction well pipe 32, wherein the cathode electrode 21 is electrically connected with the cathode of the direct current power supply 1 through a first lead 70, and the anode electrode 22 is electrically connected with the anode of the direct current power supply 1 through a second lead 80;
and the cation selective permeable membrane column 5 is arranged in the cathode reaction well pipe 21 and sleeved outside the cathode electrode 21 so as to enable hydrogen ions and heavy metal ions in the underground water to pass through in a single direction and enter the interior of the cathode reaction well pipe.
In the electrodynamic device of the present embodiment, when the device is powered on, the groundwater enters the cathode reaction well pipe 31 and the anode reaction well pipe 32 through the perforation at the lower part of the reaction well pipe 3, and under the action of the electric fields of the cathode electrode 21 and the anode electrode 22, the heavy metal ions in the groundwater migrate towards the cathode electrode 21, and the negative ions migrate towards the anode electrode 22, and at the same time, the cathode generates an electrolytic reaction: h2O+e-→OH-+H2Generating hydrogen gas; and (3) anode reaction: OH group-+4e-→2H2O+O2Oxygen is generated, and heavy metal ions can pass through and enter the cation selective permeable membrane column 5 to react with OH generated by cathode electrolysis-The reaction occurs and the formed precipitate is removed by replacing or cleaning the cation permselective membrane column 5 or the cathode electrode 21. As electrolysis occurs, the pH within the cation permselective membrane column 5 increases and OH produced by the electrolysis-Cannot be separated through the cation permselective membrane column 5, and ensures that the ion concentration in the cation permselective membrane column 5 is not reduced, thereby reducing the conductivity.
In this embodiment, the cathode cap 312 and the anode cap 322 are hermetically disposed on the upper portions of the cathode reaction well pipe 31 and the anode reaction well pipe 32, respectively, and a cathode exhaust pipe 313 and an anode exhaust pipe 323 are respectively disposed through the cathode cap 312 and the anode cap 322, respectively, for exhausting hydrogen generated by the electrolytic reaction of the cathode electrode 21 and oxygen generated by the electrolytic reaction of the anode electrode 22.
It should be noted that the provision of the cathode cap 312 or the anode cap 322, and the cathode evacuation pipe 313 or the anode evacuation pipe 323 thereon facilitates the collection of the gas inside the cathode reaction well pipe 31 or the anode reaction well pipe 32. In this embodiment, the cathode cap 312 and the anode cap 322 are disposed on the upper portion of the cathode reaction well pipe 31 and the anode reaction well pipe 32, and the cathode emptying pipe 313 and the anode emptying pipe 323 are disposed on the cathode cap 312 and the anode cap 322, but the present invention is not limited thereto, and the cathode cap 312 or the anode cap 322 may be disposed on the cathode reaction well pipe 31 or the anode reaction well pipe 32 according to the kind of the gas to be collected, or the cathode cap 312 or the anode cap 322 may not be disposed when the gas is not required to be collected.
In this embodiment, the first lead 70 and the second lead 80 are further respectively sleeved with a first sleeve 7 and a second sleeve 8, wherein the first sleeve 7 passes through the cathode cap 312 and is sealed with the cathode cap 312; the second sleeve 8 passes through the anode cap 322 and is sealed with the anode cap 322. Thus, when the electrolytic reaction is performed, the cathode cap 312 and the anode cap 322 do not leak the gas inside, and meanwhile, when the cathode 21, the anode 22 and the cation permselective membrane column 5 need to be replaced or cleaned, the first lead 70 and the second lead 80 can be conveniently drawn in the first casing 7 and the second casing 8, respectively, so that these parts can be easily taken out from the reaction well pipe 3, and the usability of the electrodynamic device of the present invention is increased.
In this embodiment, the upper opening of the cation permselective membrane column 5 is further provided with a fastening member 6, the structure of which is shown in fig. 2 and 3, the fastening member 6 is above the groundwater level 100, and comprises a fixing hole 61 for penetrating and fixing the first casing to prevent the first lead from shaking during the reaction process; and a plurality of ventilation holes 62 for discharging gas generated by the cathode electrolysis reaction, wherein the number of the ventilation holes is 4 in the embodiment.
In this embodiment, the electrodynamic apparatus of the present invention further includes a cathode gas collecting unit, including: an air pump 41 communicated with the cathode evacuation pipe 313 for pumping the gas in the cathode reaction well pipe 31; and the gas collecting unit is used for collecting and storing the sucked gas. According to actual needs, an anode gas collecting unit can be further arranged for sucking the gas in the anode reaction well pipe 32.
In the present embodiment, the lower portion 311 of the cathode reaction well pipe and the lower portion 321 of the anode reaction well pipe are immersed in the underground water 100 to a depth of 1m to 2m, so as to achieve a better treatment effect and a lower construction cost.
In this embodiment, the walls of the lower portion 311 of the cathode reaction well tubes and the lower portion 321 of the anode reaction well tubes have perforations with a diameter between 8mm and 12mm, which ensure permeation of groundwater while avoiding the ingress of larger impurities into the reaction well tubes 3.
In the present embodiment, the material of the reaction portion of the cathode electrode 21 and the anode electrode 22 is graphite.
In this embodiment, the first sleeve 7 and the second sleeve 8 are made of polyvinyl chloride (PVC) or Polyethylene (PE).
In this embodiment, the reaction well pipe 3, the cathode evacuation pipe 313, and the anode evacuation pipe 323 are made of High Density Polyethylene (HDPE), which has advantages of excellent strength and corrosion resistance, and easy processing and molding.
Example 2
This embodiment provides one the utility model discloses a construction method of electrodynamic device to explain more clearly the utility model discloses a structure and beneficial effect include the step during concrete implementation:
1) after the polluted area to be treated is leveled to form a ground 200, drilling two reaction wells by a drilling machine to reach a certain depth below the underground water surface; in this embodiment, the depth is 1m to 2 m;
2) placing two reaction well pipes 3 into two reaction wells respectively, wherein one reaction well pipe is a cathode reaction well pipe 31, the other reaction well pipe is an anode reaction well pipe 32, the two reaction well pipes 3 are prefabricated according to the well depth and the well diameter of the reaction well to be drilled, and the pipe wall at a certain depth of the lower part of the two reaction well pipes is provided with a plurality of through holes; in the embodiment, the reaction well pipe is made of HDPE, and has perforations with a diameter of 8 mm-12 mm at a depth of 1 m-2 m at the lower part thereof, so that the underground water can permeate into the reaction well pipe 3;
3) arranging a cathode emptying pipe 313 and a first sleeve 7 on the cathode pipe cap 312, arranging an anode emptying pipe 323 and a second sleeve 8 on the anode pipe cap 322, passing a first lead 70 through the first sleeve 7, and passing a second lead through the second sleeve 8; in this embodiment, the cathode evacuation pipe 313 and the anode evacuation pipe 323 are made of HDPE, and the first sleeve 7 and the second sleeve 8 are made of PVC or PE;
4) a cathode electrode 21 externally sleeved with a cation selective permeable membrane column 5 is connected with the negative electrode of the direct current power supply 1 through a first lead 70; the anode electrode 22 is connected with the anode of the direct current power supply 1 through a second lead 80, and the lengths of the first lead 70 and the second lead 80 are reserved with enough allowance so as to facilitate the replacement and adjustment of the electrode and the membrane column;
5) after adjusting to a proper position, the cathode electrode 21 with the cation selective permeable membrane column 5 sleeved outside is placed below the underground water surface 100 in the cathode reaction well pipe 31, the anode electrode 22 is placed below the underground water surface 100 in the anode reaction well pipe 32, the cathode pipe cap 312 and the anode pipe cap 322 are covered, and finally the joint is sealed.
The utility model discloses an electrodynamic device is at the operation in-process, and cation selective permeability membrane post 5 need be changed at intervals, clears up the surface of negative pole electrode 21 simultaneously, changes the completion back, and the processing of resealing between negative pole cap 312 and the first sleeve pipe 7. Because the first wire 70 can be conveniently drawn in the first sleeve 7, the cation permselective membrane column 5 and the cathode electrode 21 can be easily taken out from the cathode reaction well pipe 31, and the electrodynamics device is easier to use and maintain and has increased usability.
The utility model discloses an electrodynamic device simple structure, easily construction and installation under the condition of prefabricating well casing 3 and the pipe cap that corresponds, quick completion at the job site is built, and construction and maintenance cost are low, can be used to the restoration of the soil heavy metal pollution of the large amount of bodies simultaneously, are favorable to the popularization and application of electrodynamic repair technique in the environmental protection field.
The above is only the preferred embodiment of the present invention, not for limiting the protection scope of the present invention, and the ordinary skilled person in the art can use the equivalent modification or change of the present invention, which should belong to the protection scope of the present invention.
Claims (10)
1. An electrodynamic apparatus for remediating soil contaminated with heavy metals, comprising:
two reaction well pipes, which are a cathode reaction well pipe and an anode reaction well pipe, and are provided with an upper part above the ground water surface and a lower part with a certain depth below the ground water surface, wherein the pipe wall of the lower part is provided with a plurality of perforations so that the ground water can penetrate into the reaction well pipes;
the two reaction electrodes are a cathode electrode and an anode electrode which are respectively arranged below the underground water surface in the cathode reaction well pipe and the anode reaction well pipe, wherein the cathode electrode is electrically connected with the cathode of the direct current power supply through a first lead, and the anode electrode is electrically connected with the anode of the direct current power supply through a second lead;
and the cation permselective membrane column is arranged in the cathode reaction well pipe and sleeved outside the cathode electrode so as to enable hydrogen ions and heavy metal ions in the underground water to pass through and enter the inside of the cathode reaction well pipe in a single direction.
2. The electrodynamic apparatus for remediating heavy metal pollution of soil of claim 1, wherein the upper portion of the cathode reaction well pipe is hermetically provided with a cathode cap through which a cathode evacuation pipe is inserted for evacuating gas from the inside of the cathode reaction well pipe; and/or
The anode reaction well pipe is characterized in that an anode pipe cap is arranged on the upper portion of the anode reaction well pipe in a sealing mode, and an anode emptying pipe penetrates through the anode pipe cap and is used for discharging gas in the anode reaction well pipe.
3. The electrodynamic apparatus for remediating heavy metal pollution of soil of claim 2, wherein the first lead is sheathed with a first bushing, the first bushing passing through and being sealed to the cathode cap; and/or
And a second sleeve is sleeved outside the second lead and penetrates through the anode tube cap to be sealed with the anode tube cap.
4. The electrodynamics device for remediating heavy metal pollution of soil of claim 3, wherein said opening of said cation permselective membrane column is further provided with a fastener comprising:
the fixing hole is used for penetrating and fixing the first sleeve; and
and the plurality of air holes are used for discharging air.
5. The electrodynamics device for remediating heavy metal pollution of soil as recited in any one of claims 2 to 4, further comprising: the cathode gas collecting unit is communicated with the cathode emptying pipe and is used for collecting and pumping gas in the cathode reaction well pipe; and/or
And the anode gas collecting unit is communicated with the anode emptying pipe and is used for pumping gas in the anode reaction well pipe.
6. The electrodynamics device for remediating heavy metal pollution of soil of claim 1, wherein said lower portion of said reaction well casing is between 1 and 2 meters deep below the surface of the subterranean water.
7. The electrodynamics device for remediating heavy metal pollution of the soil of claim 1, wherein the wall of said reaction well casing has said perforations with a pore size between 8mm and 12 mm.
8. The electrodynamics device for remediating heavy metal pollution of soil as claimed in claim 1, wherein the material of the reaction portion of said cathode electrode and said anode electrode is graphite.
9. The electrodynamics device for remediating heavy metal pollution of soil of claim 3, wherein the material of said first casing and said second casing is polyvinyl chloride or polyethylene.
10. The electrodynamic apparatus for remediating heavy metal pollution of soil of claim 2, wherein the reaction well casing, and/or the cathode evacuation pipe and the anode evacuation pipe are made of high density polyethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021427878.0U CN213001807U (en) | 2020-07-20 | 2020-07-20 | Electrodynamic device for repairing soil heavy metal pollution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021427878.0U CN213001807U (en) | 2020-07-20 | 2020-07-20 | Electrodynamic device for repairing soil heavy metal pollution |
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| Publication Number | Publication Date |
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| CN213001807U true CN213001807U (en) | 2021-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202021427878.0U Active CN213001807U (en) | 2020-07-20 | 2020-07-20 | Electrodynamic device for repairing soil heavy metal pollution |
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| CN (1) | CN213001807U (en) |
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- 2020-07-20 CN CN202021427878.0U patent/CN213001807U/en active Active
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