CN115446103A - Device for in-situ ex-situ remediation of heavy metal contaminated soil and remediation method thereof - Google Patents
Device for in-situ ex-situ remediation of heavy metal contaminated soil and remediation method thereof Download PDFInfo
- Publication number
- CN115446103A CN115446103A CN202211038899.7A CN202211038899A CN115446103A CN 115446103 A CN115446103 A CN 115446103A CN 202211038899 A CN202211038899 A CN 202211038899A CN 115446103 A CN115446103 A CN 115446103A
- Authority
- CN
- China
- Prior art keywords
- heavy metal
- soil
- plate
- anode
- cathode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000002689 soil Substances 0.000 title claims abstract description 151
- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 87
- 238000005067 remediation Methods 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011066 ex-situ storage Methods 0.000 title claims abstract description 21
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 238000003795 desorption Methods 0.000 claims abstract description 29
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 17
- 238000005192 partition Methods 0.000 claims abstract description 11
- 239000004744 fabric Substances 0.000 claims abstract description 9
- 150000001768 cations Chemical class 0.000 claims abstract description 5
- 238000007599 discharging Methods 0.000 claims abstract description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 68
- 230000008439 repair process Effects 0.000 claims description 52
- 239000000243 solution Substances 0.000 claims description 19
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000009825 accumulation Methods 0.000 claims description 5
- 239000007864 aqueous solution Substances 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 3
- 229920006255 plastic film Polymers 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 9
- 231100000719 pollutant Toxicity 0.000 abstract description 9
- 238000012360 testing method Methods 0.000 description 38
- 229960004106 citric acid Drugs 0.000 description 19
- 238000009393 electroremediation Methods 0.000 description 15
- 238000005265 energy consumption Methods 0.000 description 13
- 150000002500 ions Chemical class 0.000 description 13
- 230000008569 process Effects 0.000 description 12
- 238000005370 electroosmosis Methods 0.000 description 9
- 239000011148 porous material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 239000000523 sample Substances 0.000 description 8
- 239000010949 copper Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000002791 soaking Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- -1 hydroxyl ions Chemical class 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 4
- 230000035876 healing Effects 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 239000002244 precipitate Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005868 electrolysis reaction Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000007654 immersion Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 150000007524 organic acids Chemical class 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000005995 Aluminium silicate Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 235000012211 aluminium silicate Nutrition 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000005520 electrodynamics Effects 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- 238000013313 FeNO test Methods 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- HJPBEXZMTWFZHY-UHFFFAOYSA-N [Ti].[Ru].[Ir] Chemical compound [Ti].[Ru].[Ir] HJPBEXZMTWFZHY-UHFFFAOYSA-N 0.000 description 1
- 229960004543 anhydrous citric acid Drugs 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000008263 repair mechanism Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000003802 soil pollutant Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
Classifications
-
- 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
-
- 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
- B09C2101/00—In situ
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a device for in-situ ex-situ remediation of heavy metal contaminated soil and a remediation method thereof, wherein the device comprises a remediation tank for injecting the heavy metal contaminated soil, a desorption reagent which is positioned in the remediation tank and can be mixed with the heavy metal contaminated soil, a drainage partition plate, geotechnical filter cloth, a cathode plate, an anode plate and a power supply, wherein the drainage partition plate is sequentially connected with the side wall of the cathode end of the remediation tank, the anode plate is connected with the side wall of the anode end of the remediation tank, the power supply is electrically connected with the cathode plate and the anode plate, and a plurality of short electrode posts facing the heavy metal contaminated soil are uniformly distributed on the surface of the anode plate; and injecting the heavy metal polluted soil into the repairing groove, desorbing by using a desorption reagent, switching on a power supply, and discharging heavy metal polluted cations in the polluted soil from the anode to the cathode along with water flow and current through a drainage clapboard. The invention can effectively remove heavy metal pollutants in the polluted soil and can also improve the shear strength of the soil.
Description
Technical Field
The invention relates to a contaminated soil remediation device, in particular to a device for in-situ ex-situ remediation of heavy metal contaminated soil and a remediation method thereof.
Background
The current development of the heavy industry is remarkable, and the pollution problem comes with the development of the heavy industry, wherein the pollution problem of rivers and lakes caused by disordered discharge is serious. The soft clay such as lake bottom sludge, river channel sludge and the like has the characteristics of large pore ratio, high water content, extremely low shear strength and the like, and the sludge cleaned by engineering needs to be subjected to double processes of pollution treatment and strength reinforcement when being applied to a building foundation. The electrode is inserted into the soil, so that heavy metal pollutants in the soil can be taken away by using the effects of electromigration, electroosmotic flow, electrophoresis, free expansion and the like, and meanwhile, water can be drained quickly, so that the soil achieves the effect of strengthening consolidation, and heavy metal restoration and drainage consolidation are completed synchronously. The drainage rate of the electric repair is irrelevant to the size of soil particles, and the method is very suitable for treating the soft clay foundation containing fine particles, low permeability and high water content.
However, electrokinetic repair generally has the problem of low repair efficiency, and the vicinity thereof often has a severe "focusing effect" due to hydroxyl ions generated from the cathode during repair. Thus, the solubility of heavy metal ions is generally increased by the addition of complexing agents and acidity control to prevent the production of precipitates. In addition, in order to improve the restoration effect, the xuyunlong takes artificial simulation of Cd polluted red soil as a research object, and different catholyte (FeNO) are explored 3 、CuSO 4 Citric acid, etc.) for acidity control, the results show that: fe (NO) 3 The solution is used as a cathode electrolyte and the pH is controlled, so that the analysis and migration of Cd are remarkably promoted, and the optimal restoration effect is achieved; cd preparation by cold and smart 2+ The simulated polluted kaolin with the initial concentration of 500mg/kg is subjected to a repairing experiment on cadmium-polluted kaolin by an electric technology, the influence of repairing time and acetic acid added into a cathode tank to control pH on a repairing effect is researched, and the result shows that: the removal and migration efficiency is improved along with the increase of the operation time, the operation time of 4 days is economical and effective under the experimental condition, and the removal and migration efficiency of Cd can be improved by controlling the pH value of the cathode. At present, an anode solution tank, a cathode solution tank, an anode electrolytic cell, a cathode electrolytic cell, a peristaltic pump and the like are arranged in a traditional test device for circularly enhancing and electrically repairing heavy metal polluted soil, and the device is high in cost, high in energy consumption and low in strength.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a device for in-situ ex-situ remediation of heavy metal contaminated soil, which can improve the remediation efficiency and further reduce the energy consumption.
The second purpose of the invention is to provide a repairing method of the device for in-situ ex-situ repairing of heavy metal contaminated soil.
The technical scheme is as follows: in order to realize the aim, the invention discloses a device for in-situ ex-situ remediation of heavy metal contaminated soil, which comprises a remediation tank for injecting the heavy metal contaminated soil, a desorption reagent which is positioned in the remediation tank and can be mixed with the heavy metal contaminated soil, a drainage clapboard, a geotechnical filter cloth, a cathode plate, an anode plate and a power supply, wherein the drainage clapboard is sequentially connected with the side wall of the cathode end of the remediation tank, the geotechnical filter cloth and the cathode plate are connected with the side wall of the anode end of the remediation tank, the anode plate is connected with the side wall of the anode end of the remediation tank, and the power supply is electrically connected with the cathode plate and the anode plate; and injecting the heavy metal polluted soil into the repairing groove, desorbing by using a desorption reagent, switching on a power supply, and discharging heavy metal polluted cations in the polluted soil from the anode to the cathode along with water flow and current through a drainage clapboard.
Wherein, the negative plate is the metal fretwork board, and it has strip form hollow out construction to distribute in succession on the face of this negative plate.
Preferably, the drainage baffle comprises a drainage shell, polygonal mesh cells with holes uniformly distributed in the drainage shell, a water collecting bin positioned below the drainage shell, and a water leakage plate which is positioned in the drainage shell and used for separating the polygonal mesh cells from the water collecting bin and uniformly distributed in the holes.
Furthermore, a drain hole is arranged on the water collecting bin, and a drain pipe is connected to the drain hole.
Furthermore, the drainage shell is of a shell structure with an opening on one side, and the opening of the drainage shell faces the inner cavity of the repair groove.
Preferably, the power supply is a direct current power supply, and the potential gradient between the positive electrode and the negative electrode of the power supply is 1-2V/cm.
And the desorption reagent is prepared by mixing citric acid and a certain aqueous solution, 1-2 mol of citric acid is added into every 20kg of dry polluted soil to be restored, the citric acid and water are uniformly mixed before the addition, and the mass of the water is not (= (0.6-1.0). Times the mass of the dry polluted soil.
Further, the length of the electrode short column is 5 cm-15 cm.
Preferably, the inner wall and the bottom surface of the repair groove are provided with a waterproof layer.
The invention relates to a method for repairing heavy metal contaminated soil in situ by ex situ, which comprises the following steps:
(1) Building a repair groove on a repair site, arranging a power supply, an anode plate, a cathode plate, geotechnical filter cloth and a drainage partition plate, covering a geotechnical plastic film outside the cathode plate, extending the bottom of the film to the interior of the repair groove for a certain distance, and enabling the top of the film to be higher than the top of the repair groove for a certain distance;
(2) After the heavy metal polluted soil is filled into a repairing tank, the prepared desorption reagent and the aqueous solution are added, the mixed state is stirred to be uniform, and the heavy metal polluted soil is statically desorbed for a period of time.
(3) Determining the actually used power supply voltage according to the horizontal potential gradient of 1-2V/cm and the distance between the cathode plate and the anode plate in the repair tank, namely the power supply voltage = the horizontal potential gradient multiplied by the distance between the cathode and the anode; the positive electrode of the power supply is connected with the top of the anode plate through a lead, and the negative electrode of the power supply is connected with the top of the cathode plate;
(4) And (4) drawing out the geomembrane, switching on a power supply and starting to repair.
Has the advantages that: compared with the prior art, the invention has the following remarkable advantages:
(1) Before electric restoration, organic acid with a certain concentration is injected into soil, heavy metal pollutants are desorbed into a soil pore solution, then two ends of the soil are electrified, and pore solution is discharged by utilizing current, electromigration and the like, so that the dual purposes of simultaneously removing heavy metal pollution and improving the shear strength of the soil are achieved;
(2) The electrode short column can effectively solve the problem of interface resistance surge caused by 'plate-soil separation' near the anode in the electric repair process, and the electric repair efficiency is improved by effectively ensuring that the current is not attenuated too fast through the prolonged electrode short column;
(3) The construction method is simple, in-situ remediation can be performed, the electric remediation and the electroosmosis drainage consolidation are combined, heavy metal pollutants are removed, and meanwhile, the shear strength of the soil is synchronously improved;
(4) The drainage clapboard used at the cathode can effectively and easily collect and discharge the electromigration to the sewage collection end.
Drawings
FIG. 1 is a schematic structural view of the present invention;
figure 2 is a front view of an anode plate of the present invention;
figure 3 is a side view of an anode plate of the present invention;
FIG. 4 is a schematic view of a cathode plate of the present invention;
FIG. 5 is a schematic view of a drainage baffle of the present invention;
FIG. 6 is a schematic diagram of sample sampling points after two sets of experiments are completed in example 1 of the present invention;
FIG. 7 is a schematic view showing the water discharge amount in two sets of test electric restoration processes in example 1 of the present invention;
FIG. 8 is a water content distribution diagram of each part of soil after the two groups of tests in embodiment 1 of the present invention have finished electrokinetic remediation;
FIG. 9 is a graph of current versus time for two sets of experimental electrokinetic healing processes in example 1 of the present invention;
FIG. 10 is a schematic diagram showing the shear strength of each part of the soil after the completion of two sets of experimental electrokinetic remediation in example 1 of the present invention;
FIG. 11 is a graph showing the ph values of the soil after the completion of electrokinetic remediation in example 1;
FIG. 12 is a graph showing the change of potential near the anode with time during two sets of experimental electrokinetic healing processes in example 1 of the present invention;
FIG. 13 is a schematic diagram showing the removal rate of heavy metal Cu in each part of soil after two groups of tests in embodiment 1 of the invention complete electrokinetic remediation;
FIG. 14 is a graph of current versus time for two experimental electrokinetic healing processes in example 2 of the present invention;
FIG. 15 is a graph showing the ph of each part of the soil after the completion of electrokinetic remediation in the two sets of experiments in example 2 of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
As shown in figure 1, the device for in-situ ex-situ remediation of heavy metal contaminated soil comprises a remediation tank 1, a drainage partition plate 2, geotechnical filter cloth 3, a cathode plate 4, an anode plate 5, a power supply 6, an electrode short column 7 and a drain pipe 8.
The repairing groove 1 is built by cement and brick blocks, the bottom of the whole groove is 10cm higher than the ground, the top of the groove is 210cm higher, the width of the bottom of each brick built on each side wall of the groove is 100cm, and the slope of the outer side is 70 degrees. The restoration groove can be flexibly arranged according to the scale of restoration polluted soil, the width of the inner groove is 1-2 m, the depth of the groove is more than 2m, the length of the groove is more than 2m, the inner wall and the bottom of the whole water tank are subjected to waterproof treatment to form a waterproof layer, a pre-buried drain pipe 8 is arranged at the position of the cathode side 2cm away from the bottom of the groove along the length direction of the groove every 2m, the caliber of a pipeline of the drain pipe 8 is 5cm, and the drain pipe 8 corresponds to the drain hole 205 at the bottom of the drain partition plate 2 one by one. Injecting heavy metal contaminated soil 10 into a repairing tank 1, mixing a desorption reagent with the heavy metal contaminated soil in the repairing tank 1, wherein the desorption reagent is formed by mixing citric acid and a certain aqueous solution, 1-2 mol of citric acid is added into every 20kg of dry contaminated soil to be repaired, and the citric acid and water are uniformly mixed before adding, and the mass of the water is not = (0.6-1.0). Times the mass of the dry contaminated soil; before traditional electric restoration, a desorption reagent is fully contacted with soil to complete a desorption process, and after the desorption is completed, a solution containing heavy metal pollutants is discharged by an electroosmosis method to complete double purposes of removing the heavy metal polluted soil pollutants and improving the shear strength.
The side wall of the cathode end of the repair tank 1 is sequentially connected with a drainage baffle plate 2, a geotechnical filter cloth 3 and a cathode plate 4, the side wall of the anode end of the repair tank is connected with an anode plate 5, the cathode plate 4 and the anode plate 5 form a loop with a power supply 6, the power supply 6 is a direct current power supply, and the potential gradient between the anode and the cathode of the power supply is 1-2V/cm. Screw holes are reserved in the positions, 15cm away from the top of the tank and 15cm away from the bottom of the tank, of the negative plate and the drainage partition plate, the diameter of each screw hole is 2.5cm, the screw holes are distributed along the length direction, one screw hole is arranged every 100cm and used for connecting the negative plate and the drainage partition plate with the side wall of the cathode end of the repair tank through screws, the diameter of each screw is 2.5cm, and the length of each screw is 20cm.
As shown in fig. 5, the drainage baffle 2 includes a drainage shell 201, perforated polygonal mesh cells 202, water accumulation chambers 203 and a water leakage plate 204, the drainage shell 201 is a shell structure with an opening on one side, the opening of the drainage shell faces the inner cavity of the repair tank, the perforated polygonal mesh cells 202 are uniformly distributed in the drainage shell, the water accumulation chambers 203 are located below the drainage shell, the water accumulation chambers 203 are provided with drainage holes 205, and the drainage holes 205 are connected with the drainage pipe 8; the water leakage plates 204 uniformly distributed in the holes are positioned in the drainage shell, and the water leakage plates 204 are used for separating the polygonal grid units from the water collecting bin. According to requirements, the height of the drainage clapboard is equal to that of the repair groove, the length of the drainage clapboard is equal to that of the repair groove, the whole thickness of the drainage clapboard is 13cm, the thickness of the bottom plate of the drainage shell 201 is 3cm, the bottom water collecting bin is a rectangular water bin, the height of the bottom water collecting bin is 20cm, a drainage hole 205 is arranged at a position 5cm away from the bottom along the length direction, the diameter of the drainage hole 205 is 6cm, and the whole drainage clapboard is made of Polycarbonate (PC) materials. A plurality of closely distributed circular holes are densely distributed on the water leakage plate 204, the diameter of each hole is 1-3cm, and the thickness of the water leakage plate is 3cm. Each side of each polygonal grid unit with holes in the drainage partition plate is 10cm, the thickness of each polygonal grid unit with holes is 3cm, the height of each polygonal grid unit with holes is 10cm, and a hole with the diameter of 4cm is formed in the center of the bottom of each polygonal grid unit with holes.
As shown in fig. 4, the cathode plate 4 is a hollow metal plate made of titanium alloy, and strip-shaped hollow structures are continuously distributed on the surface of the cathode plate 4. As shown in fig. 2 and 3, the anode plate 5 is a metal electrode plate vertically arranged, a plurality of electrode stubs 7 facing heavy metal contaminated soil are uniformly distributed on the surface of the metal electrode plate, and a wiring hole 11 is further formed on the metal electrode plate; the electrode short column 7 is transversely and vertically welded on the metal electrode plate, and the metal electrode plate and the electrode short column are both made of ruthenium-iridium-titanium plated materials. Each electrode short column is a small cylinder with the diameter of 2cm and the length of 5 cm-15 cm, the transverse distance of each short column is 10cm, the longitudinal distance of each short column is 10cm, the short columns are distributed in a square shape, and the short columns of the electrodes are arranged from the position 15cm away from the bottom of the electrodes. The disadvantage of an excessively long electrode stub: the cost of the electrode plate and the construction cost are increased, the power consumption is increased, the soil remediation effect of the part through which the long probe passes is reduced, and the remediation cost ratio is reduced; the disadvantage of an excessively short electrode stub size: when the soil is cracked to a certain degree, the electrode plate and the soil body cannot be connected by the too short probe, the part of the plate soil still has a separation phenomenon, and the repairing effect is weakened. Before electric restoration, organic acid with a certain concentration is injected into soil, heavy metal pollutants are desorbed into soil pore solution, then two ends of the soil are electrified, and pore solution is discharged by utilizing galvanic current, electromigration and the like, so that the dual purposes of simultaneously removing heavy metal pollution and improving the shear strength of the soil are achieved.
The repair mechanism is as follows: before restoration, a desorption reagent (low molecular organic acid (citric acid adopted in the embodiment)) is utilized to fully contact with the heavy metal Cu-polluted soil, on one hand, the pH value of the soil is controlled to prevent a focusing phenomenon (namely copper ions and hydroxyl ions react to generate precipitates and accumulate) in the vicinity of a cathode, and the action and the circulation enhancement are similar to the purpose of adding acid into a cathode pool, and hydrogen ions released by the acid react with hydroxyl ions generated by electrolysis in the vicinity of a cathode plate in an electric process to avoid the generation of the precipitates. The second aspect is to utilize hydrogen ions ionized by citric acid to compete with heavy metal ions adsorbed in the soil, to "squeeze" some of the heavy metal ions down into solution, and to discharge the heavy metal ions out of the soil along with the current and water. The invention can realize the improvement of strength, and has less energy consumption and less reagent consumption, namely, the invention is economical and energy-saving; compared with the traditional contaminated soil remediation method, the heavy metal removal rate is almost the same, but the test device is simpler, and the method is more economical in engineering facility construction.
The invention relates to a method for repairing a device for in-situ ex-situ remediation of heavy metal contaminated soil, which comprises the following steps:
(1) Building a repair groove on a repair site, arranging a power supply, an anode plate, a cathode plate, geotechnical filter cloth and a drainage partition plate, covering a geotechnical plastic film outside the cathode plate, extending the bottom of the film into the repair groove for covering by 10cm, and enabling the top of the film to be 10cm higher than the top end of the repair groove;
(2) After the heavy metal contaminated soil is filled into a repair tank, the prepared desorption reagent and the aqueous solution are added, the mixed state is stirred to be uniform, and the mixture is statically desorbed for 2 hours.
(3) Determining actually used power supply voltage according to the horizontal potential gradient of 1-2V/cm and the distance between a cathode plate and an anode plate in the repair tank, namely the power supply voltage = the horizontal potential gradient multiplied by the distance between the cathode and the anode; the positive electrode of the power supply is connected with the top of the anode plate through a lead, and the negative electrode of the power supply is connected with the top of the cathode plate;
(4) And (4) extracting the geomembrane, switching on a power supply and starting to repair. In the invention, heavy metal polluted soil is injected into the repairing tank 1, the desorption reagent is desorbed, the power supply 6 is switched on, and heavy metal polluted cations in the polluted soil migrate from the anode to the cathode along with water flow and current and are discharged through the drainage clapboard 2. The remediation method disclosed by the invention can be used for removing heavy metal pollutants and simultaneously improving the shear strength of the soil. The invention solves the problem of interface resistance surge caused by plate-soil separation of the anode part in the electro-dynamic remediation and electroosmosis drainage consolidation, and ensures that the current is not attenuated too fast through the short electrode column, thereby improving the electro-dynamic remediation efficiency.
Example 1
The device and the method for in-situ ex-situ remediation of heavy metal contaminated soil are adopted to perform remediation tests on actual clay foundations of certain engineering places in the tin-free city. The electric repair tank of the invention was simulated in a concrete laboratory with a repair tank made of plexiglass, the external dimensions of which were 210mm x 110mm x 105mm and the internal dimensions of which were 200mm x 100mm. And the electrokinetic repair test under a conventional flat plate anode was used as a control test. The test conditions are shown in table 1.
TABLE 1 test conditions
In both tests, 30V direct current is adopted, the potential gradient is 1.5V/cm, the mass of the dry soil for restoring soil is 2.8kg, the water content of the initial polluted soil is 50%, the content of heavy metal copper is 3000mg/kg, the concentration of the added citric acid is 0.1mol/kg (anhydrous citric acid: the mass of the dry soil), the citric acid is uniformly mixed with 280g of water before being added, the stirring time is 10 minutes after the citric acid is added, the desorption time is 2 hours, and the electric restoration time is 48 hours.
Fig. 6 is a schematic diagram showing sample sampling points after two groups of tests are finished, after two groups of repair and restoration tests are started, the drainage conditions of the two groups of tests are recorded every 1h, the change of the total drainage amount of the two groups of tests with time in 48 hours is shown in fig. 7, and after the tests are finished, the water content of each part S1-S5 of the soil body is shown in fig. 8.
As shown in fig. 7, in the repairing process, the drainage trends under the two electrodes are similar, and both show that the drainage tends to be in a stop state after the drainage is rapidly increased. However, compared with 305mL of common anode lower total drainage, the total anode lower drainage with the short electrode column is 375mL, and the total drainage is improved by 23%, which shows that the repaired drainage is effectively improved under the anode with the short electrode column. The more the drainage, the lower the soil moisture content naturally, and fig. 8 shows the soil moisture content at different positions, as shown in fig. 8, the soil moisture content after the anode repair using the short column with the electrode is entirely lower than that of the soil under the common electrode, the anode part is even lower than 26%, and the moisture content is 21.2% lower than that of the cathode part of 33%. More drainage and lower water content are also beneficial to removing heavy metal polluted soil and improving the soil strength.
After the self-repairing is started, the test current is collected every 20 minutes, the current in the whole process is shown in fig. 9, although the currents in the two groups of tests both accord with the general current trend in the electric repairing process, the two groups of currents have obvious difference. In the early and middle stages of electric repair, the test current of the extended anode of the probe is higher than that of the common anode, the maximum current of the anode with the short electrode column is 585mA, the minimum value of the anode with the short electrode column is 162mA, the maximum current of the common anode is 495mA, and the minimum current of the anode with the short electrode column is 124 mA.
The following table compares the total energy consumption and the unit drainage energy consumption of the anode and the cathode, and the table shows that the total energy consumption of the anode with the short electrode column for repairing is larger than that of the common anode, but the unit drainage energy consumption = total energy consumption/total drainage because the soil body can beat more water under the anode with the short electrode column, so the comprehensive result shows that the unit drainage energy consumption of the anode with the short electrode column is smaller than that of the common anode, and the unit drainage energy consumption is reduced by about 5.6%.
After the repair is finished, the soil sample is divided into five parts to be subjected to the shear strength test, and the result is shown in figure 10, and the graph shows that the overall shear strength of the soil under the anode with the short anode column is improved, the S1 position closest to the anode reaches 188kPa, and is improved by 36.2% compared with 138kPa under the common anode; the S5 position closest to the cathode also reaches 38kPa, which is increased by 46.2 percent compared with 26kPa under the common anode, mainly because the short electrode column effectively makes up for the excessive increase of the interface resistance caused by the 'plate-soil separation', avoids the large-amplitude and premature attenuation of the current, and further improves the water discharge so that the whole soil body has higher shear strength. Therefore, the electrode short column has beneficial effect on the improvement of the shear strength of the soil body.
The pH profile of the soil after remediation is shown in figure 11. After desorption was complete, the soil pH was: 2.48, after the repair is finished, the pH values of the parts close to the anode under the short-column anode and the common anode are respectively as follows: 2.19 and 2.21, the variation is relatively small. The pH of the cathode-adjacent part under the two anodes was: 7.18 and 4.57. The pH of the soil under the anode of the electrode stub is generally higher than that of the soil under the common anode, which is mainly because most of water is quickly drained from the soil under the anode of the electrode stub, and a large amount of OH is continuously generated by the cathode along with the progress of electrokinetic remediation - So the pH also increases.
FIG. 12 is a graph showing the change of potential near the anode with time during two experimental electrokinetic healing processes of the present invention. In the repairing process, a pen worker respectively arranges a group of potential probes at an equipotential position near the two groups of test anodes, and records the potential change condition near the anode electrode plate under the two types of electrodes in the electric repairing process. As shown in fig. 12, at the beginning of the test, the potentials in both anode modes are about 6V, the soil has high water content and is in a flowing state in the early stage of remediation, the electrode plate is in close contact with the soil, and the current is gradually reduced and the potential is gradually reduced as the water is gradually taken away by electroosmosis; however, when the water is drained to a certain degree, the effective stress is increased, the soil particles are close to each other, the soil body shrinks, and the anode plate electrode and the soil are separated, so that the potential is greatly improved.
Fig. 13 is a schematic diagram of the removal rate of heavy metal Cu in each part of the soil after two groups of tests and repairs are finished. As shown in the figure, after the test is finished, when the electrode short column anode is used for electrically repairing soil, the removal rate of heavy metal of each part is higher than that of heavy metal of each part under a common anode, and the removal rate of the S1 area reaches 85% and is 25% higher than that of the common anode; the S3 area is 53 percent and is 36 percent higher than that of the common anode; the removal rate of the S5 area is 25 percent, which is 25 percent higher than that of the common anode. Compared with a common anode, the probe prolongs the anode, more free water is moved, and heavy metal pollutants are also taken away under the action of electromigration, so that the electric repair efficiency is improved.
Example 2
Compared with the traditional test device for circularly enhancing electrokinetic remediation of heavy metal contaminated soil, the invention has the advantages that:
the test conditions are as follows: in both tests, 30V direct current is adopted, the potential gradient is 1.5V/cm, the quality of the dry soil for restoring the soil is 2.8kg, and the content of heavy metal copper is 3000mg/kg.
(1) For the traditional cyclic enhanced electro-kinetic remediation group: the initial polluted soil water content is 55%, naCl solution with the concentration of 0.1mol/L is added into an anode electrolysis circulating pool, citric acid solution with the concentration of 0.2mol/L and the volume of 1L of the two solutions is added into a cathode electrolysis circulating pool, the solutions in an electrolytic cell are updated by a peristaltic pump all the time, the solutions in a cathode solution tank and an anode solution tank are updated once every day, a power supply is switched on after the initial polluted soil water content is prepared, and the electric restoration time is 48 hours.
(2) For the soak desorption combined electrokinetic remediation group: the water content of the initial soil heavy metal contaminated soil is 50%, the concentration of the added citric acid is 0.1mol/kg (citric acid: dry soil mass), the citric acid is uniformly mixed with 280g of water (the ratio of the citric acid to the soil is 10%) before the citric acid is added, the stirring time is 10 minutes after the citric acid is added, the desorption time is 2 hours, the upper filtrate (about 5%) is removed after the analysis is finished, then the power supply is switched on, and the electric restoration time is 48 hours.
TABLE 2 test conditions
Current comparison and energy consumption analysis: as shown in fig. 14, the current in both tests increased and then decreased during the electrokinetic remediation process. The current of the soaking desorption combined electric restoration group rapidly rises and then gradually falls, and then tends to be flat, and the reasons are as follows: in the early stage of electric restoration, conductive particles in soil are quickly mobilized under the environment of potential difference, and the current is increased along with the conductive particles; then, along with the electric restoration, water molecules, charged cations and the like in the soil are discharged outwards under the action of current, so that the water content of the soil is reduced, the conductivity is weakened, the resistance is increased, and the current is gradually reduced; after the power is supplied for 24 hours, along with the discharge of a large amount of moisture in the electric repair process, the electroosmosis drainage rate is greatly weakened, and the current is reduced and tends to be gentle.
In the cyclic enhanced electric restoration test group, the current gradually increases at the early stage mainly because the conductive ions in the whole system are still in an inactivated static state at the beginning of the test, and a large amount of OH generated by the cathode and the anode along with the development of the test - And H + The ions enter the soil body, and polar water molecules migrate to the cathode in the pores of the soil body to form a through channel, the ions begin to be slowly diffused in the soil body, the conductivity of the whole system is slowly increased, and a peak value appears until the optimal state of electrification is achieved. However, as electrokinetic remediation proceeds, the current slowly decreases, primarily due to: (1) the cathode and anode plates generate a large amount of hydrogen and oxygen on the surface during the electroosmosis process, and the bubblesThe air bubbles are good insulators, and can form a non-conductive film on the surface of the electrode plate to hinder the process of electric repair [81] So the current is reduced; (2) along with conductive Cu 2+ Ions slowly migrate into the cathode tank and circulate into the cathode solution tank, and Cu present in the whole system is changed as fresh cathode and anode solution is changed every 24h 2+ Ions will slowly decrease, and the current will naturally also decrease; (3) h + And OH - Each moving in the direction of the cathode and anode, H + The moving speed of the ions is OH - About 1.8 times of ions, and therefore contains H + And contains OH - The alkaline peaks meet at 1/3 of the soil body near the cathode plate, the pH at the meeting part is subjected to sudden change, so that at the position and the alkaline zone area near the cathode, cu 2+ The ions undergo a large amount of precipitation reaction and react with Cu (OH) 2 The insoluble precipitates exist in the soil body, and can block the soil pores, so that the development of electromigration and electroosmotic flow in the soil is not facilitated, and meanwhile, the soil resistance can be increased, and the system current is reduced.
Further, knowing the voltage 30V, according to the calculation formula of the electric energy:
w＝∫UIdt
the electrical energy consumed by each of the two tests can be calculated as shown in the following table:
| test group | Total electric energy consumption (W. H) |
| Immersion desorption combined electric remediation of heavy metal contaminated soil | 325.47 |
| Traditional circulation enhanced electrokinetic remediation of heavy metal contaminated soil | 343.32 |
From the above table, the main reason why the soaking/desorption combined electric repair set consumes a little less electric energy than the circulation-enhanced electric repair set is that the repair current of the circulation set is maintained at a higher level in the middle and later periods of the electric repair, so that more electric energy is consumed.
The removal rate is as follows: after the test is finished, the removal rate of the heavy metals at each test point of the soil is shown in fig. 15. After the electric restoration test is finished, the heavy metal removal rates in the two groups of soil samples show the trend of high anode and low cathode. The heavy metal removal rate under the cyclic enhanced electrokinetic remediation is slightly higher than that under the combined immersion desorption and electrokinetic remediation on the whole, and is particularly embodied in the S5 position close to the cathode, wherein the heavy metal removal rate is 37 percent and is more than 20 percent of that of the immersion group. Comparing the two experiments, the removal rates of heavy metals at the anode are not much different, but the removal rates of heavy metals at the cathode are much different, which may be caused by: under the working condition of combined soaking desorption and electric restoration, the water content of the cathode is higher after the electrification is finished, and a plurality of heavy metal ions still exist in the pore liquid and cannot be discharged in time.
The shear strength of the soil after remediation is shown in the following table:
from the above table, it can be seen that, by adopting the method of combining soaking desorption and electrokinetic remediation to remediate heavy metal contaminated soil, after remediation is completed, because of the difference of remediation mechanisms, electroosmosis is directly performed after soaking, so that the water in the soil pores is removed while the heavy metal contaminants are carried away, the strength of each part of the soil is obviously improved, and the method has very important significance for secondary utilization of contaminated soil in engineering.
In conclusion, the heavy metal polluted soil is remediated by the combination of soaking desorption and electric power, the heavy metal pollutants in the polluted soil can be effectively removed, the shear strength of the soil can be improved, in a remediation test, compared with a common anode, the water discharge of the short electrode column anode is obviously improved, the unit water discharge energy consumption is reduced, the water content of the soil is lower and the strength is higher after remediation is finished, and meanwhile, the heavy metal material content in the soil is lower.
Claims (10)
1. The utility model provides a device of heavy metal contaminated soil is restoreed to ex situ which characterized in that: the device comprises a repairing tank (1) for injecting heavy metal polluted soil, a desorption reagent which is positioned in the repairing tank and can be mixed with the heavy metal polluted soil, a drainage clapboard (2), a geotechnical filter cloth (3) and a cathode plate (4) which are sequentially connected with the side wall of the cathode end of the repairing tank, an anode plate (5) connected with the side wall of the anode end of the repairing tank, and a power supply (6) electrically connected with the cathode plate and the anode plate, wherein a plurality of electrode short columns (7) facing the heavy metal polluted soil are uniformly distributed on the surface of the anode plate (5); and (3) injecting the heavy metal polluted soil into the repairing tank (1), desorbing the desorption reagent, switching on a power supply (6), and discharging heavy metal polluted cations in the polluted soil from the anode to the cathode along with water flow and current through the drainage partition plate (2).
2. The apparatus for ex situ remediation of heavy metal contaminated soil as claimed in claim 1, wherein: the negative plate (4) is a metal hollow plate, and strip-shaped hollow structures are continuously distributed on the surface of the negative plate (4).
3. The apparatus for ex situ remediation of heavy metal contaminated soil as claimed in claim 1, wherein: the drainage baffle (2) comprises a drainage shell (201), polygonal mesh cells (202) with holes uniformly distributed in the drainage shell, a water accumulation bin (203) positioned below the drainage shell and a water leakage plate (204) which is positioned in the drainage shell and used for separating the polygonal mesh cells and the water accumulation bin and is uniformly distributed in the holes.
4. The apparatus for ex situ remediation of heavy metal contaminated soil of claim 3, wherein: a drain hole (205) is formed in the water collecting bin (203), and a drain pipe (8) is connected to the drain hole (205).
5. The apparatus for ex situ remediation of heavy metal contaminated soil of claim 3, wherein: the drainage shell (201) is of a shell structure with an opening on one side, and the opening of the drainage shell faces the inner cavity of the repair groove.
6. The apparatus for in-situ ex-situ remediation of heavy metal contaminated soil according to claim 1, wherein: the power supply (6) is a direct current power supply, and the potential gradient between the anode and the cathode of the power supply is 1-2V/cm.
7. The apparatus for ex situ remediation of heavy metal contaminated soil as claimed in claim 1, wherein: the desorption reagent is prepared by mixing citric acid and aqueous solution, 1-2 mol of citric acid is added to repair 20kg of dry contaminated soil, and the citric acid and water are uniformly mixed before the addition, wherein the mass of the water is = (0.6-1.0) multiplied by the mass of the dry contaminated soil.
8. The apparatus for ex situ remediation of heavy metal contaminated soil as claimed in claim 1, wherein: the length of the electrode short column (7) is 5 cm-15 cm.
9. The apparatus for in-situ ex-situ remediation of heavy metal contaminated soil according to claim 1, wherein: the inner wall and the bottom surface of the repair groove (1) are provided with waterproof layers.
10. A method for remediating an apparatus for in situ ex situ remediation of heavy metal contaminated soil according to any one of claims 1 to 9, comprising the steps of:
(1) Building a repair groove on a repair site, arranging a power supply, an anode plate, a cathode plate, geotechnical filter cloth and a drainage partition plate, covering a geotechnical plastic film outside the cathode plate, extending the bottom of the film to the interior of the repair groove for a certain distance, and enabling the top of the film to be higher than the top of the repair groove for a certain distance;
(2) After the heavy metal polluted soil is filled into a repairing tank, the prepared desorption reagent solution is added, the mixed state is stirred to be uniform, and the heavy metal polluted soil is statically desorbed for a period of time.
(3) Determining actually used power supply voltage according to the horizontal potential gradient of 1-2V/cm and the distance between a cathode plate and an anode plate in the repair tank, namely the power supply voltage = the horizontal potential gradient multiplied by the distance between the cathode and the anode; the positive electrode of the power supply is connected with the top of the anode plate through a lead, and the negative electrode of the power supply is connected with the top of the cathode plate;
(4) And (4) extracting the geomembrane, switching on a power supply and starting to repair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211038899.7A CN115446103B (en) | 2022-08-29 | 2022-08-29 | Device for in-situ and ex-situ restoration of heavy metal contaminated soil and restoration method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211038899.7A CN115446103B (en) | 2022-08-29 | 2022-08-29 | Device for in-situ and ex-situ restoration of heavy metal contaminated soil and restoration method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115446103A true CN115446103A (en) | 2022-12-09 |
| CN115446103B CN115446103B (en) | 2024-03-26 |
Family
ID=84300498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211038899.7A Active CN115446103B (en) | 2022-08-29 | 2022-08-29 | Device for in-situ and ex-situ restoration of heavy metal contaminated soil and restoration method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115446103B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116603852A (en) * | 2023-06-15 | 2023-08-18 | 江苏暨之阳环保科技有限公司 | Electrocatalytic spray repair process and equipment for heavy metal contaminated soil |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527707A (en) * | 2012-02-24 | 2012-07-04 | 上海市环境科学研究院 | Enhanced electrokinetic remediation method of heavy metal contaminated soil |
| US20140131206A1 (en) * | 2012-11-13 | 2014-05-15 | Azaroghly YAZDANBOD | Capacitive electrokinetic dewatering of suspensions and soils |
| CN105880276A (en) * | 2016-06-27 | 2016-08-24 | 上海大学 | Repair method of cadmium and lead polluted soil and electric-microorganism united permeable reaction wall repair device |
| CN206604880U (en) * | 2017-03-07 | 2017-11-03 | 中国地质科学院矿产资源研究所 | Uniform electric field obtaining device for electrically repairing polluted soil |
| CN206981413U (en) * | 2017-07-17 | 2018-02-09 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | A kind of barrier prosthetic device for heavy-metal contaminated soil |
| CN109304361A (en) * | 2018-10-11 | 2019-02-05 | 西安科技大学 | Heavy-metal contaminated soil electro reclamation analogy method |
| CN110369490A (en) * | 2019-08-20 | 2019-10-25 | 合肥学院 | A kind of prosthetic device and restorative procedure of heavy-metal contaminated soil |
| CN113000592A (en) * | 2021-02-20 | 2021-06-22 | 江南大学 | Method for electrically repairing heavy metal copper polluted soil |
-
2022
- 2022-08-29 CN CN202211038899.7A patent/CN115446103B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527707A (en) * | 2012-02-24 | 2012-07-04 | 上海市环境科学研究院 | Enhanced electrokinetic remediation method of heavy metal contaminated soil |
| US20140131206A1 (en) * | 2012-11-13 | 2014-05-15 | Azaroghly YAZDANBOD | Capacitive electrokinetic dewatering of suspensions and soils |
| CN105880276A (en) * | 2016-06-27 | 2016-08-24 | 上海大学 | Repair method of cadmium and lead polluted soil and electric-microorganism united permeable reaction wall repair device |
| CN206604880U (en) * | 2017-03-07 | 2017-11-03 | 中国地质科学院矿产资源研究所 | Uniform electric field obtaining device for electrically repairing polluted soil |
| CN206981413U (en) * | 2017-07-17 | 2018-02-09 | 云南省环境科学研究院(中国昆明高原湖泊国际研究中心) | A kind of barrier prosthetic device for heavy-metal contaminated soil |
| CN109304361A (en) * | 2018-10-11 | 2019-02-05 | 西安科技大学 | Heavy-metal contaminated soil electro reclamation analogy method |
| CN110369490A (en) * | 2019-08-20 | 2019-10-25 | 合肥学院 | A kind of prosthetic device and restorative procedure of heavy-metal contaminated soil |
| CN113000592A (en) * | 2021-02-20 | 2021-06-22 | 江南大学 | Method for electrically repairing heavy metal copper polluted soil |
Non-Patent Citations (2)
| Title |
|---|
| 李婷婷;张玲妍;郭书海;黄殿男;: "完全对称电场对电动-微生物修复石油污染土壤的影响", 环境科学研究, no. 10 * |
| 范瑞娟;郭书海;李凤梅;吴波;: "混合烃污染土壤微生物-电动修复中的互补性研究", 农业环境科学学报, no. 01 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116603852A (en) * | 2023-06-15 | 2023-08-18 | 江苏暨之阳环保科技有限公司 | Electrocatalytic spray repair process and equipment for heavy metal contaminated soil |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115446103B (en) | 2024-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Martin et al. | Electro-osmosis treatment techniques and their effect on dewatering of soils, sediments, and sludge: A review | |
| Puppala et al. | Enhanced electrokinetic remediation of high sorption capacity soil | |
| CN109731905B (en) | Autonomous controllable electric acidification dissociation device and method for soil or substrate sludge pollutants | |
| CN101838740A (en) | Method for removing soluble heavy metal ions in situ | |
| CN115446103B (en) | Device for in-situ and ex-situ restoration of heavy metal contaminated soil and restoration method thereof | |
| CN107441950A (en) | A kind of electrochemical couple ceramic filtration membrane and its application | |
| CN108609696A (en) | A kind of potent electro reclamation device of original position underground water and restorative procedure | |
| CN107746163A (en) | A kind of dystrophication sediment in-situ decrement decontamination apparatus based on pore water guide | |
| CN109045847A (en) | A kind of apparatus and method of factory's waste residue dehydration decontamination | |
| CN109926447A (en) | A variety of contaminated soil advanced oxidation collaboration electrodynamics in-situ remediation systems and method | |
| CN102503059A (en) | Method for removing heavy metal from sludge and device thereof | |
| CN210632630U (en) | Electric repairing device for heavy metal contaminated soil | |
| CN112170474A (en) | Method for repairing arsenic-polluted soil by electrically-driven reinforced permeable reactive barrier | |
| CN207671889U (en) | A kind of dystrophication sediment in-situ decrement decontamination apparatus based on pore water guide | |
| CN106424117A (en) | Device for electro-kinetic remediation of heavy metal contaminated soil by utilizing copper salt reinforced cathode | |
| CN110902899A (en) | Garbage pressing leachate treatment device and method | |
| CN110369490B (en) | Heavy metal contaminated soil remediation device and remediation method | |
| CN201971667U (en) | High-voltage pulsed electric coagulation equipment for treating organic wastewater | |
| CN210117331U (en) | Sludge modification-restoration integrated system based on electrochemical treatment | |
| CN105776799B (en) | Batch production electro-osmosis sludge dehydration treatment technology | |
| CN210523390U (en) | Electronic prosthetic devices of compound heavy metal contaminated soil | |
| CN115026121A (en) | Method and device for electrokinetic remediation of heavy metal contaminated soil by using nanostructure foam iron-based sulfide three-dimensional electrode | |
| CN209866960U (en) | Autonomous controllable soil or sediment pollutant electric acidification dissociation device | |
| CN114535282A (en) | Method for degrading organic contaminated soil by combining electric diffusion and persulfate oxidation | |
| CN114084937A (en) | Ferroelectric chemical water treatment method for convection-enhanced ion mass transfer |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |