CN111282983A - Electrothermal coupling chemical oxidation method and device - Google Patents
Electrothermal coupling chemical oxidation method and device Download PDFInfo
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- CN111282983A CN111282983A CN202010105297.3A CN202010105297A CN111282983A CN 111282983 A CN111282983 A CN 111282983A CN 202010105297 A CN202010105297 A CN 202010105297A CN 111282983 A CN111282983 A CN 111282983A
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- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 39
- 230000003647 oxidation Effects 0.000 title claims abstract description 38
- 239000000126 substance Substances 0.000 title claims abstract description 37
- 230000008878 coupling Effects 0.000 title claims abstract description 20
- 238000010168 coupling process Methods 0.000 title claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000001590 oxidative effect Effects 0.000 claims abstract description 64
- 239000007800 oxidant agent Substances 0.000 claims abstract description 63
- 238000002347 injection Methods 0.000 claims abstract description 33
- 239000007924 injection Substances 0.000 claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 24
- 238000002955 isolation Methods 0.000 claims abstract description 23
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 239000002689 soil Substances 0.000 claims abstract description 20
- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 230000009471 action Effects 0.000 claims abstract description 7
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims abstract description 4
- 230000005684 electric field Effects 0.000 claims description 25
- 239000011159 matrix material Substances 0.000 claims description 25
- 230000004913 activation Effects 0.000 claims description 17
- 239000003814 drug Substances 0.000 claims description 15
- 230000005540 biological transmission Effects 0.000 claims description 8
- 230000007646 directional migration Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 5
- 238000005260 corrosion Methods 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 230000005012 migration Effects 0.000 claims description 4
- 238000013508 migration Methods 0.000 claims description 4
- 238000005457 optimization Methods 0.000 claims description 3
- 238000001994 activation Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 238000011065 in-situ storage Methods 0.000 description 7
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 239000012190 activator Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 238000005265 energy consumption Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 4
- 230000008439 repair process Effects 0.000 description 4
- 238000007725 thermal activation Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 150000001875 compounds Chemical group 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000013019 agitation Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 231100000053 low toxicity Toxicity 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 210000002325 somatostatin-secreting cell Anatomy 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides an electrothermal coupling chemical oxidation method and a device, wherein the device comprises an oxidant preparation and injection unit, a monitoring control unit and a power regulation unit, wherein the oxidant preparation and injection unit can inject an oxidant into polluted soil; the monitoring control unit can detect the change conditions of the conductivity and the oxidation-reduction potential in the polluted soil; the electric power regulating unit comprises an isolation voltage regulator, a rectifier and a change-over switch, wherein the input end of the isolation voltage regulator is connected with an alternating current power supply, the output end of the isolation voltage regulator is directly connected with an electrode in polluted soil through the change-over switch, or the output end of the isolation voltage regulator is connected with the electrode through the rectifier, and therefore alternating current or direct current is transmitted to the electrode. According to the invention, direct current is firstly applied to lead the oxidant to migrate directionally, and then alternating current is applied to lead the oxidant to be activated under the heating action of the alternating current field, so that the polluted soil is efficiently oxidized.
Description
Technical Field
The invention relates to the technical field of soil remediation.
Background
The in-situ chemical oxidation technology is a high-efficiency in-situ restoration technology suitable for treating a source area, an oxidant is injected into a soil or underground water polluted area, the oxidant contacts with pollutants to generate an oxidation effect, the pollutants are converted into substances which are non-toxic or have relatively low toxicity, and the in-situ chemical oxidation technology has the characteristics of good economy, quick restoration effect, remarkable effect and the like. However, for low-permeability stratum, the problem of poor oxidant mass transfer exists, and because the transmission and diffusion of the oxidant are influenced by the permeability of soil, the oxidant cannot be fully contacted with pollutants, so that the in-situ chemical oxidation effect is poor.
Sodium persulfate is a novel oxidizing agent with strong oxidizing power (E)02.01V), wide pH adaptation range, strong stability, high solubility, low economic cost, high safety and the like, and particularly can form sulfate radical (E) after activation02.5-3.1V), the oxidizing power is further improved, the pollutant treatment types can be increased, the reaction rate is accelerated, and the using amount of an oxidant is reduced. Therefore, the advanced oxidation technology based on sodium persulfate is gradually widely applied to the remediation engineering of organic pollution sites.
The sodium persulfate may be activated by heat, or by the addition of an activating agent, such as iron (Fe)2+/Fe0+) Strong oxidant activation (H)2O2) And base activation (NaOH), etc., but in the latter the presence of an activator and persulfateThe proportion is difficult to control (the activator is added too much, the activator can react with the generated sulfate radical to cause unnecessary consumption of the radical; the activator is added too little, the oxidant can not be fully activated), the activation efficiency is low (only one sulfate radical can be generated by 1 persulfate ion), the environment friendliness is poor (the pH is required for alkali activation)>10) And the like. In contrast, thermal activation is a more efficient and environmentally friendly way of activation. The bond energy of the O-O bond in the persulfate is 140kJ/mol, heating>50 ℃) causes the breaking of O-O bonds to generate sulfate free radicals, and the temperature of thermal activation of the persulfate is about 50 ℃. Because the free radicals generated by activation have poor stability and short time (about 4 s), the optimal activation time for thermal activation of the oxidant is that the oxidant is transmitted to a polluted area and then the thermal activation of the oxidant is carried out, thereby achieving the purposes of improving the activation efficiency of the oxidant and reducing the dosage of the oxidant.
Therefore, the key of the in-situ chemical oxidation technology is the technology for realizing uniform migration and dispersion of the oxidant and the efficient heating activation technology.
Disclosure of Invention
The invention provides an electrothermal coupling chemical oxidation method and device, aiming at solving the problems of poor mass transfer of a low-permeability stratum and low activation efficiency of an oxidant in an in-situ chemical oxidation technology.
In order to achieve the purpose, the invention adopts the technical scheme that:
an electrothermal coupling chemical oxidation device is characterized in that: the device comprises an oxidant preparing and injecting unit, a monitoring control unit and a power regulating unit, wherein:
the oxidant preparing and injecting unit can inject an oxidant into the polluted soil;
the monitoring control unit can detect the change conditions of the conductivity and the oxidation-reduction potential in the polluted soil;
the electric power regulating unit comprises an isolation voltage regulator, a rectifier and a change-over switch, wherein the input end of the isolation voltage regulator is connected with an alternating current power supply, the output end of the isolation voltage regulator is directly connected with an electrode in polluted soil through the change-over switch, or the output end of the isolation voltage regulator is connected with the electrode through the rectifier, and therefore alternating current or direct current is transmitted to the electrode.
The electrothermal coupling chemical oxidation device is characterized in that: the electrodes are arranged in a mode that basic units are regular triangles, and an electrode matrix is formed;
when the electrode is connected with direct current, a plurality of regular hexagonal units are arranged in the electrode matrix, wherein six vertexes of each regular hexagonal unit are all negative electrodes, and the electrode at the central position of each regular hexagonal unit is a positive electrode; the rest single falling electrodes are arranged in a mode that positive and negative electrodes are staggered and adjacent;
when the electrodes are connected with alternating current, the phases of each regular triangle basic unit in three angles are different.
The electrothermal coupling chemical oxidation device is characterized in that: the electrode matrix is formed by combining an electrode injection integrated well and an electrode well.
The electrothermal coupling chemical oxidation device is characterized in that: the electrode injection integrated well is made of corrosion-resistant metal.
An electrothermal coupling chemical oxidation method, which adopts the electrothermal coupling chemical oxidation device, wherein: firstly, an oxidant is injected into soil through an oxidant preparation and injection unit, then a first operation stage and a second operation stage are sequentially performed, and the oxidant injection, the first operation stage and the second operation stage are repeatedly performed, wherein:
the first operation stage is a direct current directional migration stage: connecting a change-over switch of the power regulating unit to a rectifier to convert alternating current into direct current and transmitting the direct current to an electrode so as to form a direct current electric field underground; the direct current voltage is regulated through an isolation voltage regulator, and the electric field intensity of a direct current electric field is regulated, so that the migration rate of the oxidant is controlled; the oxidant is driven by a direct current electric field to directionally migrate and diffuse to a specified polluted area;
the second operation stage is an alternating current heating activation stage: after the monitoring control unit judges that the oxidant is transmitted to the specified pollution area, the change-over switch of the power adjusting unit is connected to another circuit, so that alternating current is directly transmitted to the electrode, and an alternating current field is formed underground; the direct current voltage is regulated through an isolation voltage regulator, and the electric field intensity of an alternating current electric field is regulated, so that the soil heating rate and the heating temperature are controlled; the oxidant is activated under the heating action of the alternating current electric field to produce sulfate radicals with stronger oxidizing capability.
The electrothermal coupling chemical oxidation method comprises the following steps: the electrodes are arranged in a mode that basic units are regular triangles, and an electrode matrix is formed;
in the first operation stage, a plurality of regular hexagonal units are arranged in the electrode matrix, wherein six vertexes of each regular hexagonal unit are all negative electrodes, and the electrodes at the central positions of the regular hexagonal deformation units are positive electrodes;
in the second operating phase, the phases of each elementary cell in the shape of a regular triangle are different at three angles.
The electrothermal coupling chemical oxidation method comprises the following steps: the electrode matrix is formed by combining an electrode injection integrated well and an electrode well.
The electrothermal coupling chemical oxidation method comprises the following steps: the electrode injection integrated well is made of corrosion-resistant metal.
The electrothermal coupling chemical oxidation method comprises the following steps: in the first operation stage, aiming at single falling electrodes existing in the regular hexagonal layout, a rotary switching mode is further adopted, the layout of the electrodes is subjected to space optimization combination, so that the regular hexagonal electrode units move in the electrode matrix along the transverse direction and the longitudinal direction, and the single falling electrodes are brought into new regular hexagonal units, so that the medicament transmission dead angle is eliminated.
The electrothermal coupling chemical oxidation method comprises the following steps: and injecting the oxidant again, and performing the operation stage I and the operation stage II in sequence.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, the electrode injection integrated well is used, so that the compound functions of injecting the medicament and leading in direct current and alternating current can be realized, the functions are integrated, and the well construction cost and time are reduced;
(2) in the direct current reinforced oxidant directional migration stage, the electrode matrix can form any plurality of regular hexagonal electrode units by adjusting the direct current positive and negative electrode distribution of the electrodes, so that the effective action area of a single electrode is the largest and the induced average field intensity is the highest, further the operation energy consumption is reduced, the medicament diffusion uniformity is improved, and the medicament dosage is reduced;
(3) in the alternating current heating and activating stage, the electrodes are enabled to form a regular triangle layout by adjusting the alternating current phase distribution of the electrodes, and the current can be heated between any two adjacent electrodes, so that heating cold spots are avoided (if the alternating current phases of the two adjacent electrodes are the same, the current cannot flow between the two adjacent electrodes, and the two adjacent electrodes cannot be heated), and therefore, the heating effect is better and uniform, the oxidant activation efficiency is higher, and the heating energy consumption is reduced;
(4) in the first operation stage, the polarity of the electric field is periodically switched in a rotary switching mode, so that dead corners of medicament transmission can be eliminated, and the medicament can be uniformly diffused.
Drawings
FIG. 1 is a schematic structural diagram of an electrothermal coupling chemical oxidation apparatus provided by the present invention;
FIG. 2 is a schematic diagram of an operation of an electro-thermally coupled chemical oxidation apparatus provided in accordance with the present invention at a first stage of operation;
FIG. 3A is a schematic view of the polarity distribution of the electrode matrix during phase one of operation;
FIG. 3B is a schematic illustration of the polarity distribution of one of the hexagonal cells of FIG. 3A;
FIG. 4 is a schematic diagram of the operation of the electro-thermal coupled chemical oxidation apparatus of the present invention in operation stage two;
FIG. 5A is a schematic view of the polarity distribution of the electrode matrix during phase two of operation (①, ②, ③ represent three-phase connections to the hot line, respectively);
FIG. 5B is a schematic diagram of the polarity distribution of one of the delta cells in FIG. 5A (①, ②, ③ represent three-phase junctions with fire lines, respectively).
Fig. 6 is a schematic diagram of the action of controlling the movement of the regular hexagonal electrode units in the transverse direction and the longitudinal direction in the electrode matrix.
Description of reference numerals: an oxidant preparation and injection unit 1; an oxidant storage agitation tank 11; a pressurized injection pump 12; the electrode injection integral well 13; a monitoring control unit 2; a monitoring well 21; a power conditioning unit 3; an isolation voltage regulator 31; a rectifier 32; a changeover switch 33; an electrode matrix 4.
Detailed Description
As shown in fig. 1, the present invention provides an electrothermal coupling chemical oxidation apparatus, comprising an oxidant preparing and injecting unit 1, a monitoring control unit 2 and a power regulating unit 3, wherein:
the oxidant preparing and injecting unit 1 comprises an oxidant storage stirring tank 11, a pressurizing injection pump 12 and an electrode injection integrated well 13, wherein the electrode injection integrated well 13 is made of corrosion-resistant metal materials, can be used as an oxidant injection well and an electrode, and introduces direct current or alternating current into the ground;
the monitoring control unit 2 comprises a monitoring well 21, a detector (capable of detecting oxidation-reduction potential, pH value, conductivity, water content and/or temperature and the like in soil), a display and a memory (not shown in the figure), and is configured with intelligent control software of 'anode and cathode/phase time-sharing switching';
the power regulating unit 3 comprises an isolation voltage regulator 31, a rectifier 32 and a change-over switch 33, wherein the input end of the isolation voltage regulator 31 is connected with an alternating current power supply, the output end of the isolation voltage regulator 31 can be selected to be directly connected with the electrode injection integrated well 13 through the change-over switch 33, or the output end of the isolation voltage regulator is selected to be connected with the electrode injection integrated well 13 and/or the electrode well through the rectifier 32, and therefore alternating current or direct current is transmitted to the electrode injection integrated well 13 and/or the electrode well.
When the invention is used:
firstly, an oxidizing agent (sodium persulfate) is injected into the electrode injection integrated well 13 through an oxidizing agent preparation and injection unit, and then an operation stage one and an operation stage two are alternately performed, wherein:
the first operation stage is a direct current directional migration stage: connecting a change-over switch 33 of the power conditioning unit 3 to a rectifier 32 to convert alternating current to direct current and transmitting the direct current to the electrode injection integral well 13 and/or the electrode well through a cable, thereby forming a direct current electric field underground; the direct current voltage is regulated through an isolation voltage regulator 31, and the electric field intensity of a direct current electric field is regulated, so that the migration rate of the oxidant is controlled; the oxidant (sodium persulfate) is driven by a direct current electric field to carry out directional migration diffusion (figure 2); preferably, the electrode injection integrated wells 13 and/or the electrode wells are arranged in a manner that the basic units are regular triangles, the electrode matrix 4 can be formed after the number of the electrode injection integrated wells is enlarged, and regular hexagonal units are formed in the electrode matrix 4, wherein six vertex electrodes of each regular hexagonal unit are negative electrodes, the electrodes at the central positions of the regular hexagonal deformation units are positive electrodes, and the rest single falling electrodes are arranged in a manner that the positive electrodes and the negative electrodes are staggered and adjacent; by monitoring the intelligent 'anode and cathode/phase time-sharing switching' control software of the control unit 2, the anode and cathode (the anode and cathode are staggered and adjacent to form a regular hexagonal electrode unit as shown in fig. 3A and 3B) of each electrode injection integrated well 13 and/or electrode well are adjusted, so that the medicament transmission effect is more uniform and efficient;
the second operation stage is an alternating current heating activation stage: after the oxidant is transmitted to the designated pollution area (judged by monitoring the conductivity and oxidation-reduction potential change conditions in the soil detected by the control unit 2), the change-over switch 33 of the power regulating unit 3 is connected to another circuit, so that the alternating current is directly transmitted to the electrode matrix 4, and an alternating current electric field is formed underground; the direct current voltage is regulated through an isolation voltage regulator 31, and the electric field intensity of an alternating current electric field is regulated, so that the soil heating rate and the heating temperature are controlled; the oxidant (sodium persulfate) is activated under the heating action of the alternating current electric field to produce sulfate radicals with stronger oxidizing power (as shown in figure 4); as described above, the electrode matrix 4 is arranged in a manner that the basic units are regular triangles, and the intelligent "time-sharing switching between positive and negative electrodes/phases" control software of the monitoring control unit 2 adjusts the phases of each regular triangle basic unit to be different at three angles (as shown in fig. 5A and 5B), so that current can flow between any two adjacent electrodes, and the heating effect is more uniform and efficient;
after the operation is carried out for a period of time, according to the condition of the pollutant removal effect, the oxidant is injected again, and the operation stage I and the operation stage II are alternately repeated until the restoration target is reached; in the process of the first repeated operation stage, the intelligent control software of 'time-sharing switching of positive and negative electrodes/phases' of the monitoring control unit 2 is adopted to perform space optimization combination on the layout of the electrodes by adopting a rotation switching mode aiming at single falling electrodes existing in the regular hexagonal layout, so that the regular hexagonal electrode units move in the electrode matrix along the transverse direction and the longitudinal direction (as shown in fig. 6), the single falling electrodes are accommodated in the new regular hexagonal units, the dead angle of medicament transmission is eliminated, and the aim of uniformly diffusing the medicament is fulfilled; in addition, the invention can reduce the repair range and carry out accurate repair on partial areas based on the accurate regulation and control of a single electrode according to the pollutant removal condition.
The invention has the following beneficial effects:
(1) according to the invention, the electrode injection integrated well 13 is used, so that the compound functions of injecting the medicament and leading in direct current and alternating current can be realized, the functions are integrated, and the well construction cost and time are reduced;
(2) in the direct current reinforced oxidant directional migration stage, the electrode matrix 4 can form any plurality of regular hexagonal electrode units by adjusting the direct current positive and negative electrode distribution of the electrodes, so that the effective action area of a single electrode is the largest and the induced average field intensity is the highest, further the operation energy consumption is reduced, the medicament diffusion uniformity is improved, and the medicament dosage is reduced;
(3) in the alternating current heating and activating stage, the electrodes are enabled to form a regular triangle layout by adjusting the alternating current phase distribution of the electrodes, and the current can be heated between any two adjacent electrodes, so that heating cold spots are avoided (if the alternating current phases of the two adjacent electrodes are the same, the current cannot flow between the two adjacent electrodes, and the two adjacent electrodes cannot be heated), and therefore, the heating effect is better and uniform, the oxidant activation efficiency is higher, and the heating energy consumption is reduced;
(4) in the first operation stage, the polarity of the electric field is periodically switched in a rotary switching mode, so that dead corners of medicament transmission can be eliminated, and the medicament can be uniformly diffused.
Generally speaking, the technical method and the device can solve the problems of poor mass transfer of the oxidizing agent in a low-permeability stratum and high-efficiency activation of persulfate after reaching a polluted area, and can reduce well construction cost, reduce the using amount of the oxidant, improve the transmission rate of the oxidant, accelerate the oxidation reaction rate, improve the removal rate of in-situ chemical oxidation on the whole, reduce the repair cost and shorten the repair time by using a multifunctional injection/electrode well structure, a two-dimensional electrode configuration (a regular hexagonal electrode unit), a regular triangular layout, electric field rotary switching and other modes.
Claims (10)
1. An electrothermal coupling chemical oxidation device is characterized in that: the device comprises an oxidant preparing and injecting unit, a monitoring control unit and a power regulating unit, wherein:
the oxidant preparing and injecting unit can inject an oxidant into the polluted soil;
the monitoring control unit can detect the change conditions of the conductivity and the oxidation-reduction potential in the polluted soil;
the electric power regulating unit comprises an isolation voltage regulator, a rectifier and a change-over switch, wherein the input end of the isolation voltage regulator is connected with an alternating current power supply, the output end of the isolation voltage regulator is directly connected with an electrode in polluted soil through the change-over switch, or the output end of the isolation voltage regulator is connected with the electrode through the rectifier, and therefore alternating current or direct current is transmitted to the electrode.
2. The electro-thermally coupled chemical oxidation apparatus of claim 1, wherein: the electrodes are arranged in a mode that basic units are regular triangles, and an electrode matrix is formed;
when the electrode is connected with direct current, a plurality of regular hexagonal units are arranged in the electrode matrix, wherein six vertexes of each regular hexagonal unit are all negative electrodes, and the electrode at the central position of each regular hexagonal unit is a positive electrode; the rest single falling electrodes are arranged in a mode that positive and negative electrodes are staggered and adjacent;
when the electrodes are connected with alternating current, the phases of each regular triangle basic unit in three angles are different.
3. An electro-thermally coupled chemical oxidation apparatus according to claim 2, wherein: the electrode matrix is formed by combining an electrode injection integrated well and an electrode well.
4. An electro-thermally coupled chemical oxidation apparatus according to claim 3, wherein: the electrode injection integrated well is made of corrosion-resistant metal.
5. An electrothermal coupling chemical oxidation method, which adopts the electrothermal coupling chemical oxidation apparatus according to claim 1, characterized in that: firstly, an oxidant is injected into soil through an oxidant preparation and injection unit, then a first operation stage and a second operation stage are sequentially performed, and the oxidant injection, the first operation stage and the second operation stage are repeatedly performed, wherein:
the first operation stage is a direct current directional migration stage: connecting a change-over switch of the power regulating unit to a rectifier to convert alternating current into direct current and transmitting the direct current to an electrode so as to form a direct current electric field underground; the direct current voltage is regulated through an isolation voltage regulator, and the electric field intensity of a direct current electric field is regulated, so that the migration rate of the oxidant is controlled; the oxidant is driven by a direct current electric field to directionally migrate and diffuse to a specified polluted area;
the second operation stage is an alternating current heating activation stage: after the monitoring control unit judges that the oxidant is transmitted to the specified pollution area, the change-over switch of the power adjusting unit is connected to another circuit, so that alternating current is directly transmitted to the electrode, and an alternating current field is formed underground; the direct current voltage is regulated through an isolation voltage regulator, and the electric field intensity of an alternating current electric field is regulated, so that the soil heating rate and the heating temperature are controlled; the oxidant is activated under the heating action of the alternating current electric field to produce sulfate radicals with stronger oxidizing capability.
6. An electro-thermally coupled chemical oxidation process according to claim 5, characterized in that: the electrodes are arranged in a mode that basic units are regular triangles, and an electrode matrix is formed;
in the first operation stage, a plurality of regular hexagonal units are arranged in the electrode matrix, wherein six vertexes of each regular hexagonal unit are all negative electrodes, and the electrodes at the central positions of the regular hexagonal deformation units are positive electrodes;
in the second operating phase, the phases of each elementary cell in the shape of a regular triangle are different at three angles.
7. An electro-thermally coupled chemical oxidation process according to claim 6, characterized in that: the electrode matrix is formed by combining an electrode injection integrated well and an electrode well.
8. An electro-thermally coupled chemical oxidation process according to claim 7, wherein: the electrode injection integrated well is made of corrosion-resistant metal.
9. An electro-thermally coupled chemical oxidation process according to claim 6, characterized in that: in the first operation stage, aiming at single falling electrodes existing in the regular hexagonal layout, a rotary switching mode is further adopted, the layout of the electrodes is subjected to space optimization combination, so that the regular hexagonal electrode units move in the electrode matrix along the transverse direction and the longitudinal direction, and the single falling electrodes are brought into new regular hexagonal units, so that the medicament transmission dead angle is eliminated.
10. An electro-thermally coupled chemical oxidation process according to claim 5, characterized in that: and injecting the oxidant again, and performing the operation stage I and the operation stage II in sequence.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112845572A (en) * | 2021-01-11 | 2021-05-28 | 中科鼎实环境工程有限公司 | Modularization electric heat coupling normal position chemistry is clear away and is equipped |
| CN113020246A (en) * | 2021-04-21 | 2021-06-25 | 中科鼎实环境工程有限公司 | In-situ removing device and method for odor substances |
| CN114082776A (en) * | 2021-10-14 | 2022-02-25 | 生态环境部南京环境科学研究所 | Electric diffusion-electric heating activation method for repairing organic contaminated soil |
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