CN110369490B - Heavy metal contaminated soil remediation device and remediation method - Google Patents
Heavy metal contaminated soil remediation device and remediation method Download PDFInfo
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- CN110369490B CN110369490B CN201910769801.7A CN201910769801A CN110369490B CN 110369490 B CN110369490 B CN 110369490B CN 201910769801 A CN201910769801 A CN 201910769801A CN 110369490 B CN110369490 B CN 110369490B
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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
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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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
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Abstract
The invention discloses a heavy metal contaminated soil remediation device, which comprises a soil box and a remediation box, wherein the soil box is connected with the remediation box; the repairing method comprises the steps of firstly, placing soil to be repaired in a soil box, and then starting a motor, a first motor, a second motor, a third motor and a fourth motor; secondly, taking out the restored soil in the restoration box together with the electrode chamber, putting the soil into an empty electrode chamber, and then starting an electric control door to enable the soil in the soil crushing box to fall down; the electrochemical and permeable reaction wall technology is combined, a barrier consisting of an active medium is arranged on a migration diffusion channel of the pollutants, so that the effect of removing the pollutants is achieved, the barrier consists of a plurality of high-permeability materials, usually an adsorbent, a catalyst, an oxidant and the like, and the active carbon fiber is selected as the adsorbent, so that the phenomenon that the electrode in a cathode area is precipitated to influence the conductivity of the electrode is avoided.
Description
Technical Field
The invention relates to the field of soil remediation, in particular to a remediation device and a remediation method for heavy metal contaminated soil.
Background
Due to human activities such as mining, industrial and agricultural production and the like, a large amount of heavy metal enters the environment, so that the problem of serious soil pollution is caused, and the large amount of heavy metal polluted soil is multi-metal composite pollution; heavy metals in soil pose serious threats to ecological environment and human health through direct or indirect modes such as food chain and the like; therefore, the development of the research on the remediation of the heavy metal contaminated soil is of great significance;
the principle of electric repair at present mainly depends on electric effects such as electromigration, electroosmotic flow, electrophoresis and the like; the problems that exist are that: (1) the electrolysis reaction leads the anode and the cathode to respectively electrolyze a large amount of H + and OH-, and the pH values in the anode chamber and the cathode chamber are rapidly changed; at the moment, under the action of an electric field, H + and OH-migrate towards the cathode and the anode respectively and enter a soil area to influence the pH, the conductivity and the like of the soil; the directional migration of H + and OH-, acid and alkali ions meet at a certain point in the system; neutralizing the two to enable the pH value of the soil to be suddenly changed; generally, the ions which are moving suddenly occur in the soil, and the ions are precipitated in advance due to the sudden change of pH, and the precipitates cause serious blockage to soil pores, are not beneficial to the movement of the ions and influence the removal effect of remediation; this phenomenon that occurs in electrokinetic remediation is known as the focusing effect; (2) as the remediation progresses, some of the ions in the soil migrating toward the electrodes form a precipitate on the electrodes, eventually forming a white insoluble film on the electrodes; this white insoluble film seriously hinders the conductivity of the electrode, causing a decrease in the system current, a phenomenon known as resistance polarization of the electrode; (3) a large amount of gas can be generated after the anode and the cathode are hydrolyzed, one part of the gas leaves the electrolytic chamber, and the other part of the gas is attached to the surface of the electrode; the attached gas forms a good insulator, which severely hinders the conductivity of the electrode and causes a drop in the system current, a phenomenon known as activation polarization of the electrode;
heavy metals adsorbed on the surfaces of soil particles in an ionic state in the soil in the leaching process are dissolved and transferred to a liquid phase under certain conditions; the soil leaching technology is a soil remediation method which uses a leaching solution capable of promoting the leaching process to leach heavy metals in soil and transfer the heavy metals into a liquid phase, and then treats the leaching solution; according to the repair principle, the leaching technology is generally applicable to sandy soil with good permeability.
Disclosure of Invention
1. Technical problem to be solved
Aiming at the problems in the prior art, the invention aims to provide a device and a method for repairing heavy metal contaminated soil, which can realize better repair of the soil.
2. Technical scheme
In order to solve the above problems, the present invention adopts the following technical solutions.
The heavy metal contaminated soil remediation device comprises a soil box and a remediation box, wherein the soil box is connected with the remediation box;
the soil box is internally provided with a soil box and a soil crushing box, the soil box is internally provided with a first auger, a first motor is connected below the first auger, and a C-shaped screening device is arranged above the soil box;
the C-shaped screening device comprises a lower pipeline, a vertical pipeline and an upper pipeline, wherein the bottom end of the vertical pipeline is communicated with the lower pipeline, and the top end of the vertical pipeline is communicated with one end of the upper pipeline; the lower pipeline is communicated with the dirty soil box, the upper surface of the lower pipeline is exposed, a second packing auger connected with a second motor is arranged in the lower pipeline, a third packing auger connected with a third motor is arranged in the vertical pipeline, and a fourth packing auger connected with a fourth motor is arranged in the upper pipeline;
the other end of the upper pipeline faces the soil crushing box, the upper surface of the upper pipeline is connected with a motor, a soil crushing net is arranged at the port, a rotating shaft of the motor is connected with a rotating blade, and a fan is arranged on the side face, facing the soil crushing box, of the vertical pipeline;
the bottom end of the soil crushing box is provided with an electric control door, and the soil crushing box is connected with the repairing box;
the electric control door, the motor, the first motor, the second motor, the third motor and the fourth motor are all electrically connected with a power supply;
the repairing box comprises a soil layer and a leaching solution layer, and the soil layer and the leaching solution layer are fixedly connected through screws;
the soil layer comprises an electrode chamber, an anode cavity and a cathode cavity, the outsides of two opposite side surfaces of the electrode chamber are respectively communicated with the cathode cavity through seepage holes formed in the side surfaces and the anode cavity, a seepage reaction wall partition is arranged in the anode cavity and is made of activated carbon fibers, and an anode is arranged at one end, far away from the electrode chamber, in the anode cavity; an anion exchange resin plate partition is arranged in the cathode cavity, and a cathode electrode is arranged at one end, far away from the electrode chamber, in the cathode cavity; the bottom of the electrode chamber is provided with a plurality of migration holes;
the leacheate layer include high concentration leacheate reserve layer and dirty liquid layer, dirty liquid layer pass through migration hole and electrode room intercommunication, high concentration leacheate reserve in situ be provided with miniature pump, miniature pump connect the one end of water pipe, the other end of water pipe is located dirty liquid layer, dirty liquid in situ be provided with the peristaltic pump, the peristaltic pump connect the one end of circulating pipe, the other end of circulating pipe runs through the positive pole chamber and is located the positive electrode below.
Preferably, a flowmeter is arranged on the water pipe.
Preferably, the leacheate in the high-concentration leacheate reserve layer is citric acid and sodium citrate.
Preferably, the repairing method comprises the following steps:
firstly, placing soil to be repaired in a soil box, and then starting a motor, a first motor, a second motor, a third motor and a fourth motor;
and secondly, taking out the restored soil in the restoration box together with the electrode chamber, putting the restored soil into an empty electrode chamber, and then starting the electric control door to enable the soil in the soil crushing box to fall down.
3. Advantageous effects
Compared with the prior art, the invention has the advantages that:
(1) the method combines the advantages of electric remediation, is suitable for low-permeability soil which is difficult to treat by other remediation technologies (such as chemical leaching), and has high remediation speed;
(2) by combining the advantages of leaching and repairing, the addition of the leacheate can be quickly and uniformly mixed in the soil, so that the transition of ph in the soil can be effectively avoided, and the advanced precipitation (focusing effect) of heavy metals in the soil can be prevented;
(3) the electrochemical and permeable reaction wall technology is combined, a barrier consisting of an active medium is arranged on a migration diffusion channel of the pollutants, so that the effect of removing the pollutants is achieved, the barrier consists of a plurality of high-permeability materials, usually an adsorbent, a catalyst, an oxidant and the like, and the active carbon fiber is selected as the adsorbent, so that the phenomenon that the electrode in a cathode area is precipitated to influence the conductivity of the electrode is avoided;
(4) the problem of large water consumption in traditional leaching repair is effectively solved by controlling the circulating flow of the leacheate, the repair efficiency is improved by adjusting the micro water pump, the adopted leacheate is citric acid and sodium citrate, the leacheate belongs to natural organic acid and is easy to degrade, and secondary pollution is reduced;
(5) heavy metals in the soil are adsorbed on the surface of soil particles in an ionic state or a simple substance form, or are coated in the soil, and are dissolved and transferred to a liquid phase under the condition of leacheate (acidity); meanwhile, the migration efficiency of the heavy metal in a liquid phase is accelerated under the action of an electric field force, and the effect of separating the heavy metal from the soil is achieved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of the repair box of the present invention.
The reference numbers in the figures illustrate:
1. repairing the box; 2. a soil pollution box; 3. a soil crushing box; 4. a first auger; 5. a lower pipeline; 6. a vertical conduit; 7. an upper pipeline; 8. a second auger; 9. a third auger; 10. a fourth auger; 11. a motor; 12. a rotary blade; 13. a fan; 14. an electrically controlled door; 15. a soil layer; 16. leaching a liquid layer; 17. an electrode chamber; 18. a seepage hole; 19. a permeable reactive barrier; 20. an anode electrode; 21. anion exchange resin plate partition; 22. a cathode electrode; 23. a high concentration leacheate reservoir layer; 24. a sewage layer; 25. a micro water pump; 26. a water pipe; 27. a peristaltic pump; 28. a circulation pipe.
Detailed Description
The drawings in the embodiments of the invention will be combined; the technical scheme in the embodiment of the invention is clearly and completely described; obviously; the described embodiments are only some of the embodiments of the invention; rather than all embodiments. Based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.
Example 1:
referring to fig. 1-2, a device for remedying heavy metal contaminated soil comprises a soil box and a remediation box 1, wherein the soil box is connected with the remediation box 1;
a soil box 2 and a soil crushing box 3 are arranged inside the soil box, a first auger 4 is arranged inside the soil box 2, a first motor is connected below the first auger 4, and a C-shaped screening device is arranged above the soil box 2;
the C-shaped screening device comprises a lower pipeline 5, a vertical pipeline 6 and an upper pipeline 7, wherein the bottom end of the vertical pipeline 6 is communicated with the lower pipeline 5, and the top end of the vertical pipeline is communicated with one end of the upper pipeline 7; the lower pipeline 5 is communicated with the soil box 2, the upper surface of the lower pipeline is exposed, a second packing auger 8 connected with a second motor is arranged in the lower pipeline 5, a third packing auger 9 connected with a third motor is arranged in the vertical pipeline 6, and a fourth packing auger 10 connected with a fourth motor is arranged in the upper pipeline 7;
the other end of the upper pipeline 7 faces the soil crushing box 3, the upper surface of the upper pipeline is connected with a motor 11, a soil crushing net is arranged at the port, a rotating shaft of the motor 11 is connected with a rotating blade 12, and a fan 13 is arranged on the side face, facing the soil crushing box 3, of the vertical pipeline 6;
an electric control door 14 is arranged at the bottom end of the soil crushing box 3, and the soil crushing box 3 is connected with the repairing box 1;
the electric control door 14, the motor 11, the first motor, the second motor, the third motor and the fourth motor are all electrically connected with a power supply.
As shown in fig. 1, in the first step, soil to be repaired is placed in a soil box (2), and then a motor (11), a first motor, a second motor, a third motor and a fourth motor are started;
placing soil (without stone and stone blocks) to be repaired in a soil box 2, wherein under the action of a first auger, the soil can rise to the upper layer of the soil box, then the soil can move towards the direction of a vertical pipeline under the drive of a second auger, then the soil can be driven to the upper part under the action of a third auger, finally under the action of a fourth auger, the soil is cut by a soil crushing net and then a plurality of soil particles are formed, then the soil particles fall from one end of an upper pipeline, under the action of a fan 13, the light soil particles can be blown down into a soil crushing box 3, the heavy soil particles can fall into a lower pipeline, and due to the mixing of a plurality of augers, the soil particles are inevitably heavy and correspondingly have larger volume when finally falling;
secondly, taking out the soil repaired in the repairing box (1) together with the electrode chamber (17), putting the soil into an empty electrode chamber (17), and then starting the electric control door (14) to enable the soil in the soil crushing box (3) to fall down;
after the soil in the electrode chamber of the lower layer is repaired, the electrode chamber is taken out of the soil layer and is placed into an empty electrode chamber again, then the electric control door is opened, and the soil in the soil crushing box falls into the electrode chamber to start repairing.
The repairing box 1 comprises a soil layer 15 and a leaching solution layer 16, wherein the soil layer 15 and the leaching solution layer 16 are fixedly connected through screws;
the soil layer 15 comprises an electrode chamber 17, an anode cavity and a cathode cavity, the outer parts of two opposite side surfaces of the electrode chamber 17 are respectively communicated with the cathode cavity through a seepage hole 18 formed in the side surface and the anode cavity, a permeable reaction wall partition 19 is arranged in the anode cavity, the permeable reaction wall partition 19 is made of activated carbon fibers, and an anode 20 is arranged at one end, far away from the electrode chamber 17, in the anode cavity; an anion exchange resin plate partition 21 is arranged in the cathode cavity, and a cathode 22 is arranged at one end of the cathode cavity far away from the electrode chamber 17; the bottom of the electrode chamber 17 is provided with a plurality of migration holes;
drip washing liquid layer 16 includes high concentration drip washing liquid reserve layer 23 and foul solution layer 24, and foul solution layer 24 passes through migration hole and electrode room 17 intercommunication, is provided with miniature pump 25 in the high concentration drip washing liquid reserve layer 23, and the one end of water pipe 26 is connected to miniature pump 25, and the other end of water pipe 26 is located foul solution layer 24, is provided with peristaltic pump 27 in the foul solution layer 24, and the one end of circulating pipe 28 is connected to peristaltic pump 27, and the other end of circulating pipe 28 runs through the positive pole chamber and is located positive electrode 20 below.
A flow meter is provided on the water pipe 26.
The leacheate in the high concentration leacheate reservoir 23 is citric acid and sodium citrate.
Putting the polluted soil into a soil chamber, adding the leacheate, and starting electrifying; heavy metals in the soil begin to be dissolved out under the action of leacheate, and migrate to the cathode electrode to move under the action of electric field force; meanwhile, the leacheate is freely diffused into the dirty liquid layer 24 under the action of the gravity of the leacheate;
the heavy metal diffused to the cathode electrode moves to the cathode electrode and is gathered at the cathode permeation reaction wall under the blocking of the anion exchange resin plate partition 21; the heavy metal which is freely expanded along with the gravity of the leacheate enters a leacheate recovery chamber, the ph of the leacheate is reduced, the high-concentration leacheate is controlled to be added to reach the initial ph value, the leacheate is pumped back to the anode chamber through a peristaltic pump, and the leacheate begins to be diffused to the soil chamber and starts to be used as the leacheate again after being adsorbed by an activated carbon fiber board under the action of potential energy difference;
the cathode region has a higher ph in the electrolysis process, and needs to be uniformly mixed with high-concentration leacheate, so that the weak acid state of the leacheate is kept in the whole repair process.
The above; but are merely preferred embodiments of the invention; the scope of the invention is not limited thereto; any person skilled in the art is within the technical scope of the present disclosure; the technical scheme and the improved concept of the invention are equally replaced or changed; are intended to be covered by the scope of the present invention.
Claims (4)
1. The utility model provides a prosthetic devices of heavy metal contaminated soil which characterized in that: the soil box is connected with the repairing box (1);
the soil box is internally provided with a soil box (2) and a soil crushing box (3), the soil box (2) is internally provided with a first packing auger (4), a first motor is connected below the first packing auger (4), and a C-shaped screening device is arranged above the soil box (2);
the C-shaped screening device comprises a lower pipeline (5), a vertical pipeline (6) and an upper pipeline (7), wherein the bottom end of the vertical pipeline (6) is communicated with the lower pipeline (5), and the top end of the vertical pipeline is communicated with one end of the upper pipeline (7); the lower pipeline (5) is communicated with the dirty soil box (2), the upper surface of the lower pipeline is exposed, a second packing auger (8) connected with a second motor is arranged in the lower pipeline (5), a third packing auger (9) connected with a third motor is arranged in the vertical pipeline (6), and a fourth packing auger (10) connected with a fourth motor is arranged in the upper pipeline (7);
the other end of the upper pipeline (7) faces the soil crushing box (3), the upper surface of the upper pipeline is connected with a motor (11), a soil crushing net is arranged at the port, a rotating shaft of the motor (11) is connected with a rotating blade (12), and a fan (13) is arranged on the side face, facing the soil crushing box (3), of the vertical pipeline (6);
an electric control door (14) is arranged at the bottom end of the soil crushing box (3), and the soil crushing box (3) is connected with the repairing box (1);
the electric control door (14), the motor (11), the first motor, the second motor, the third motor and the fourth motor are all electrically connected with a power supply;
the repairing box (1) comprises a soil layer (15) and a leaching solution layer (16), wherein the soil layer (15) and the leaching solution layer (16) are fixedly connected through screws;
the soil layer (15) comprises an electrode chamber (17), an anode cavity and a cathode cavity, the outsides of two opposite side surfaces of the electrode chamber (17) are respectively communicated with the cathode cavity through a seepage hole (18) formed in the side surface and the anode cavity, a permeable reaction wall partition (19) is arranged in the anode cavity, the permeable reaction wall partition (19) is made of activated carbon fibers, and an anode electrode (20) is arranged at one end, far away from the electrode chamber (17), in the anode cavity; an anion exchange resin plate partition (21) is arranged in the cathode cavity, and a cathode (22) is arranged at one end of the cathode cavity far away from the electrode chamber (17); the bottom of the electrode chamber (17) is provided with a plurality of migration holes;
drip washing liquid layer (16) including high concentration drip washing liquid reserve layer (23) and foul solution layer (24), foul solution layer (24) through migration hole and electrode room (17) intercommunication, high concentration drip washing liquid reserve layer (23) in be provided with miniature pump (25), miniature pump (25) connect the one end of water pipe (26), the other end of water pipe (26) is located foul solution layer (24), foul solution layer (24) in be provided with peristaltic pump (27), peristaltic pump (27) connect the one end of circulating pipe (28), the other end of circulating pipe (28) runs through the positive pole chamber and is located positive electrode (20) below.
2. The remediation device for heavy metal contaminated soil according to claim 1, wherein: the water pipe (26) is provided with a flowmeter.
3. The remediation device for heavy metal contaminated soil according to claim 1, wherein: the leacheate in the high-concentration leacheate storage layer (23) is citric acid and sodium citrate.
4. The remediation device for heavy metal contaminated soil according to claim 1, wherein the remediation method comprises:
firstly, placing soil to be repaired in a soil box (2), and then starting a motor (11), a first motor, a second motor, a third motor and a fourth motor;
and secondly, taking out the soil repaired in the repairing box (1) together with the electrode chamber (17), putting the soil into an empty electrode chamber (17), and then starting the electric control door (14) to enable the soil in the soil crushing box (3) to fall down.
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| CN112547787B (en) * | 2020-11-25 | 2022-03-11 | 合肥学院 | Portable plasma device and method for repairing polluted soil |
| CN115446103B (en) * | 2022-08-29 | 2024-03-26 | 江南大学 | Device for in-situ and ex-situ restoration of heavy metal contaminated soil and restoration method thereof |
| CN116603852B (en) * | 2023-06-15 | 2023-11-03 | 江苏暨之阳环保科技有限公司 | Electrocatalytic spray repair process and equipment for heavy metal contaminated soil |
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| WO2012176956A1 (en) * | 2011-06-21 | 2012-12-27 | 한국원자력연구원 | Complex electrokinetic decontamination apparatus for decontamination of radionuclide |
| CN106623398B (en) * | 2016-10-15 | 2022-09-27 | 太原理工大学 | Ferric salt reinforced electrodynamic remediation device for heavy metal pollution of electronic waste dismantling field |
| CN106269835B (en) * | 2016-11-10 | 2022-07-12 | 长江水利委员会长江科学院 | Electric geotextile-based soil heavy metal electric leaching-promoting removal device and method |
| CN109622590A (en) * | 2018-11-07 | 2019-04-16 | 张锐 | A kind of agricultural soil reparation integrated experimental device |
| CN109332372A (en) * | 2018-12-14 | 2019-02-15 | 浙江中地净土科技有限公司 | A kind of electro reclamation vertical unit of heavy-metal contaminated soil |
| CN109731905B (en) * | 2019-03-01 | 2024-06-11 | 长江水利委员会长江科学院 | Autonomous controllable electric acidification dissociation device and method for soil or substrate sludge pollutants |
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Effective date of registration: 20210104 Address after: 230088 new area of Hefei University, 99 Jinxiu Avenue, economic development zone, Hefei City, Anhui Province Patentee after: ANHUI JIUWU TIANHONG ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. Address before: 230601 new area of Hefei University, 99 Jinxiu Avenue, economic development zone, Hefei City, Anhui Province Patentee before: HEFEI University |