CN116765112A - Electrodynamic-osmotic reaction grid device - Google Patents
Electrodynamic-osmotic reaction grid device Download PDFInfo
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- CN116765112A CN116765112A CN202310820100.8A CN202310820100A CN116765112A CN 116765112 A CN116765112 A CN 116765112A CN 202310820100 A CN202310820100 A CN 202310820100A CN 116765112 A CN116765112 A CN 116765112A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 27
- 239000002689 soil Substances 0.000 claims abstract description 57
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000010439 graphite Substances 0.000 claims abstract description 18
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 18
- 230000005520 electrodynamics Effects 0.000 claims abstract description 16
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 15
- 229910021536 Zeolite Inorganic materials 0.000 claims abstract description 12
- 239000002131 composite material Substances 0.000 claims abstract description 12
- 239000010457 zeolite Substances 0.000 claims abstract description 12
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims abstract description 11
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052801 chlorine Inorganic materials 0.000 claims abstract description 10
- 239000000460 chlorine Substances 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 229960000892 attapulgite Drugs 0.000 claims abstract description 6
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 6
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 4
- XPFJYKARVSSRHE-UHFFFAOYSA-K trisodium;2-hydroxypropane-1,2,3-tricarboxylate;2-hydroxypropane-1,2,3-tricarboxylic acid Chemical compound [Na+].[Na+].[Na+].OC(=O)CC(O)(C(O)=O)CC(O)=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O XPFJYKARVSSRHE-UHFFFAOYSA-K 0.000 claims abstract description 4
- 239000000463 material Substances 0.000 claims description 28
- 230000008439 repair process Effects 0.000 claims description 17
- 229910001018 Cast iron Inorganic materials 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 8
- 239000004677 Nylon Substances 0.000 claims description 7
- 229920001778 nylon Polymers 0.000 claims description 7
- 239000002985 plastic film Substances 0.000 claims description 7
- 229920006255 plastic film Polymers 0.000 claims description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000011149 active material Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 206010039101 Rhinorrhoea Diseases 0.000 claims description 3
- 208000010753 nasal discharge Diseases 0.000 claims description 3
- FCBUKWWQSZQDDI-UHFFFAOYSA-N rhamnolipid Chemical compound CCCCCCCC(CC(O)=O)OC(=O)CC(CCCCCCC)OC1OC(C)C(O)C(O)C1OC1C(O)C(O)C(O)C(C)O1 FCBUKWWQSZQDDI-UHFFFAOYSA-N 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 19
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 5
- 238000011065 in-situ storage Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 230000005684 electric field Effects 0.000 abstract description 2
- 239000012429 reaction media Substances 0.000 abstract 2
- 239000003480 eluent Substances 0.000 abstract 1
- 239000003344 environmental pollutant Substances 0.000 description 6
- 231100000719 pollutant Toxicity 0.000 description 6
- 239000000126 substance Substances 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 2
- 238000002386 leaching Methods 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005370 electroosmosis Methods 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 231100000171 higher toxicity Toxicity 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003900 soil pollution Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The application provides an electrodynamic-osmotic reaction grid (EK-PRB) device, wherein the electrodynamic device and the PRB adopt an in-situ connection mode. The cathode and anode adopt graphite electrodes. The PRB reaction medium mainly consists of zeolite, active carbon and modified attapulgite with wide sources and low cost, and the PRB and the graphite electrode form a permeable reaction composite electrode. The PRB reaction medium can be replaced at any time after being out of order. The cathodes and the anodes adopt a hexagonal arrangement mode, and the defects of short acting distance and uneven electric field distribution of the traditional cathodes and the anodes are overcome. The device makes the application of EK-PRB technology to field pollution site restoration possible. In addition, the process does not have a cathode-anode electrolytic chamber, but adopts green and environment-friendly citric acid-sodium citrate and biodegradable anionic surfactant as eluent to leach soil, so that heavy metals and organic chlorine can be effectively removed.
Description
The application relates to a patent application of electrodynamic-osmotic reaction grid device and process flow suitable for field on-site combined polluted soil restoration, which is divided into 2016, 07 and 11 days and 201610539787.8.
Technical Field
The application relates to the technical field of polluted soil remediation, in particular to an electrodynamic-osmotic reaction grid device.
Background
Contaminated soil remediation is becoming more and more important both at home and abroad, and some technologies have entered engineering demonstration and application stages. The common soil restoration technology mainly comprises a chemical leaching technology, an electric restoration technology, a PRB technology and the like. Because of the different soil compositions, pollutant types, properties and the like, particularly under the condition of combined pollution of different pollutants simultaneously, a single repair technology is difficult to achieve a repair target, and therefore, the combined application of different repair technologies is more and more important.
The EK-PRB combined restoration technology is a novel and environment-friendly soil restoration technology which is developed in recent years, and mainly combines an electric restoration technology and a permeable reactive barrier technology to restore polluted soil together. The technology combines the advantages of two restoration technologies, heavy metals and organic substances (such as Cr (VI), TCE, PCE and the like) with higher toxicity are moved to the electrode end by using electrodynamic force, so that the pollutants react with the filling base material in the permeable reaction wall and are degraded into low-valence metal ions and organic substances with lower toxicity, the heavy metal polluted soil can be restored, the organic substance polluted soil can be restored, even the low-permeability polluted soil has better restoration effect, the influence of external factors is relatively small, the addition of environment-friendly substances into the soil is avoided, and the restoration cost is much lower than that of other methods.
The EK-PRB combined repair technology is used as an emerging high-efficiency in-situ repair technology, and although the repair principle is relatively simple, a plurality of actual parameters need to be considered in the field polluted site repair process, so that the operation is very complex. The domestic EK-PRB stays in the laboratory research stage, the cathode and anode are mainly connected through a direct current power supply, the pH value of the cathode and anode electrolytic tanks is continuously regulated through a buffer solution, if each cathode and anode is provided with an electrolytic tank according to a laboratory device, the difficulty of actual operation is greatly increased for field repair, and the treatment cost is increased. And because the electrode spacing of the cathode and anode of the laboratory device is very short and is about 20cm, the laboratory device is not suitable for field use. In addition, as the cathode and anode voltages have short acting distance, long treatment time and low efficiency, and the pollutants are single (mainly heavy metals Cd or Cr), and the soil pollution in China is generally the combined pollution of multiple metal or heavy metal-organic pollutants at present, a set of device and process for repairing and treating the on-site combined polluted soil, which have high repairing efficiency, low cost and strong operability, are urgently needed to be developed.
Disclosure of Invention
In order to overcome the deficiencies of the prior art, it is an object of the present application to provide.
In order to achieve the above object, the present application provides the following solutions:
the electrodynamic-osmotic reaction grid device is applied to field operation and comprises an electrodynamic device and a PRB device, wherein the electrodynamic device comprises electrodes and pressure regulating equipment, the length of each electrode is 35-40cm, the electrodes are 10cm higher than that of polluted soil, the electrodes are arranged in a regular polygon mode, each PRB device comprises PRB active reaction materials (3) placed around the electrodes, the PRB active reaction materials (3) and a composite electrode formed by the electrodes are enclosed and fixed through wire netting (4), the polluted soil (5) to be repaired is filled between the wire netting (4), the electrodes are respectively arranged at two sides of the polluted soil (5) to be repaired, an impermeable layer is arranged below the polluted soil (5) to be repaired, and each impermeable layer comprises a plastic film (9), 5-7cm thick zeolite (6), 5-7cm thick iron filings (7) and 2-5cm thick activated carbon (8) which are sequentially tiled; the electrode comprises a cathode (1) and an anode (2), the voltage regulating device is a direct current transformer (10), the cathode (1) is arranged in a regular hexagon mode, the anode (2) is arranged at the center of the regular hexagon, and the interval between the cathode (1) and/or the anode (2) is 30cm; the electrode comprises a cathode (1) and an anode (2), the voltage regulating device is a direct current transformer (10), the anode (2) is arranged in a regular hexagon manner, the cathode (1) is arranged at the center of the regular hexagon, and the interval between the cathode (1) and/or the anode (2) is 30cm; the electrodynamic device adopts solar power supply as a main power supply and a generator or mains supply as an auxiliary power supply, and outputs direct-current voltage with the interval of 0-220V through a direct-current transformer; the electrodynamic device adopts mains supply to supply power, and outputs direct-current voltage with the interval of 0-220V through a direct-current transformer; the electrode is a graphite rod electrode with the diameter of 2-4cm and the voltage gradient of 1-2V/cm; the compound contaminated soil is heavy metal and organic chlorine contaminated soil, and the PRB active reaction material (3) is zeolite, cast iron filings, attapulgite and active carbon; placing a plurality of PRB active materials around the cathode and anode graphite electrodes, and combining the PRB active materials with the graphite electrodes to form a permeable reactive composite electrode;
the electrodynamic-osmotic reaction grid apparatus comprises the steps of:
step one: providing a PRB active reactive material (3), and filling the PRB active reactive material (3) in a nylon mesh;
step two: digging a foundation pit with proper size in a field site, and sequentially paving a plastic film (9), zeolite with the thickness of 5-7cm (6), cast iron filings with the thickness of 5-7cm (7) and activated carbon with the thickness of 2-5cm (8);
step three: arranging electrodes, wrapping wire netting around the electrodes, wherein the diameter of each wire netting is 14cm, and placing nylon net filled with PRB active reaction materials (3) in a gap between the electrodes and the wire netting;
step four: burying the polluted soil to be treated between the wire meshes, spraying and irrigating the leacheate into the polluted soil, and switching on a power supply to repair the soil; the leacheate is 0.1M citric acid-sodium citrate and 0.5g/L biodegradable anionic surfactant rhamnolipid, and the water content is kept about 30%;
step five: after the repair is completed, excavating the repaired soil to other positions, and continuing to repair the soil next time;
the total removal rate of Cd in the soil after the repair is completed is 32.5%; the total removal rate of Cr was 31.5%; the total removal rate of sixty-six was 48%; the total removal rate of the nasal discharge was 48%.
Compared with the traditional EK-PRB device, the device does not design a cathode-anode chamber, but adopts a mode of spraying green and environment-friendly leacheate, and pollutants in soil enter into a solution under the action of the leacheate and directionally migrate under the action of electrodynamic force. The source of the reaction material is wide, the price is low, and the material can be replaced at any time after being invalid. The cathodes and the anodes are arranged in a hexagonal mode, and the defects that the action distance of the cathodes and the anodes is short and the electric field distribution is uneven in the past are overcome. The device makes the application of EK-PRB technology to field pollution site restoration possible.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a permeation reaction grid composite electrode layout;
fig. 2 is a diagram of a cathode-anode arrangement.
1-anode, 2-cathode, 3-PRB active reactive material, 4-wire netting, 5-heavy metal and organic chlorine contaminated soil, 6-zeolite, 7-cast iron filings, 8-active carbon, 9-plastic film and 10-DC power transformer
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The terms "first," "second," "third," and "fourth" and the like in the description and in the claims and drawings are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, inclusion of a list of steps, processes, methods, etc. is not limited to the listed steps but may alternatively include steps not listed or may alternatively include other steps inherent to such processes, methods, products, or apparatus.
The application relates to an electrodynamic force and PRB combined device for in-situ combination of an electrodynamic force-permeation reaction grid (EK-PRB), which comprises an electrodynamic force device and a PRB device, wherein the electrodynamic force device consists of electrodes and single-phase alternating current voltage regulating equipment, the electrode material can be graphite, the graphite electrode is arranged to be 5-10 cm higher than the depth H' of polluted soil, and the diameter is preferably 2-4cm, and the height is preferably 35-40cm. The cathodes and anodes 1, 2 may be arranged in a regular hexagonal manner, i.e., six cathodes are arranged around in a regular hexagon, the anodes are arranged in the center of the regular hexagon, or six anodes are arranged around in a regular hexagon, the cathodes are arranged in the center of the regular hexagon, and the electrode spacing is 30cm. The PRB active reaction material 3 is placed around the cathode and anode graphite electrode bars to form a composite electrode with the graphite electrodes, and the PRB active reaction material 3 and the composite electrodes formed by the graphite electrodes 1 and 2 are enclosed and fixed through the wire netting 4. The contaminated soil 5 to be remediated is filled between the wires 4. The cathode and anode electrodes are respectively arranged at two sides of the polluted soil 5 to be repaired, an impermeable layer is arranged below the polluted soil 5 to be repaired, the impermeable layer comprises a plastic film 9, zeolite 6 with the thickness of 5-7cm, cast iron filings 7 with the thickness of 5-7cm and activated carbon 8 with the thickness of 2-5cm which are sequentially paved, and the impermeable layer is consistent in height with the depth of the polluted soil. The impermeable layer can also be other plastic films with impermeable performance or materials with physical and chemical reactions with heavy metals and organic chlorine. The contaminated soil 5 to be remediated is heavy metal and organochlorine contaminated soil.
The method is aimed at repairing heavy metal and organic chlorine composite pollution, the composite pollution can be a plurality of heavy metals or a plurality of organic chlorine or heavy metal and organic chlorine, PRB materials used for the heavy metal and organic chlorine composite pollution are screened, finally zeolite, cast iron filings, attapulgite and active carbon are selected, the four materials are arranged in nylon bags with the length of 15cm and the width of 10cm according to a certain proportion, then are put into wire netting to serve as PRB reaction materials, the best proportion of the materials is determined through experiments, the zeolite and the attapulgite have good removal effect on heavy metal Cd, the cast iron filings have obvious Cr removal effect on heavy metal, the active carbon is used for adsorbing the organic chlorine, the active carbon is arranged in bags made of nylon nets, the materials are uniformly mixed and filled in the wire netting 4, the graphite electrode 1 or 2 is arranged at the center point of the cylindrical wire netting 4, the nylon nets filled with the four materials are filled around the graphite electrode 4 to serve as PRB reaction materials 3, and the permeable reactive grid composite electrode is formed by the graphite electrode 4.
The electric power device adopts a power supply system with solar power as a main power supply and a generator or commercial power as an auxiliary power supply. The DC output voltage of the DC power transformer 10 is 0-220V, and the voltage gradient is 1-2V/cm. The PRB filling material consists of cast iron filings, active carbon, zeolite and modified attapulgite filter materials.
The cathodes and the anodes are arranged in a hexagonal mode, the anodes are arranged at the center of the hexagon, then each vertex of the hexagon is provided with a cathode (see figure 2), so that the same distance between each pair of cathodes and the anodes is ensured, a plurality of anodes can be simultaneously adopted according to the size of the field to be repaired when the field is applied, and the cathodes are arranged around the field according to the hexagonal mode, and the EK-PRB technology is possible to be applied to field soil repair in the mode of the hexagonal mode. Unlike the negative and positive electrolyzer used in laboratory apparatus, the present application irrigates leaching solution into soil via spraying to produce electromigration, electroosmosis or electrophoresis of pollutant under the action of electric motor.
The application adopts a direct injection mode to adjust the pH and the water content of soil, omits an electrolytic tank device, saves the treatment cost and has simple operation.
Example 1:
the soil is obtained from a certain polluted site, the soil is repaired by combining electrodynamic force and PRB (physical resource block) technology as shown in the devices of figures 1-2, the soil field test area length L is 2.5m, the width D is 2m, the depth H is 0.5m, and the treatment capacity is 2.5m 3 . An impermeable layer is paved below the polluted soil, the cathode and the anode are arranged in a mode shown in figure 2, the anode is positioned at the center of the regular hexagon, the cathode is positioned at each vertex of the regular hexagon, and the distance d between the cathode and the anode is 30cm. Each graphite electrode is placed at the center of a wire gauze with the diameter of 14cm and the height of 40cm, a permeable reactive barrier medium is filled between the graphite electrode and the wire gauze, the height is consistent with the depth of soil, the soil of a polluted site is directly covered, and after compaction, direct current is applied, and the voltage gradient is 2v/cm. The soil was rinsed with 0.1M citric acid-sodium citrate and 0.5g/L of the biodegradable anionic surfactant rhamnolipid, the water content was maintained at about 30% and the total treatment time was 15 days.
Table 1 example change in index of contaminated soil before and after treatment
| Name of the name | Before treatment | After treatment | Total removal rate% |
| ca(mg/kg) | 18.4 | 12.4 | 32.5 |
| Cr(mg/kg) | 184 | 126 | 31.5 |
| Six (ug/kg) | 83 | 43.2 | 48 |
| Drop nasal discharge (ug/kg) | 209 | 108.6 | 48 |
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present application have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present application and the core ideas thereof; also, it is within the scope of the present application to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the application.
Claims (1)
1. The electrodynamic-osmotic reaction grid device is characterized by comprising an electrodynamic device and a PRB device, wherein the electrodynamic device comprises electrodes and voltage regulating equipment, the length of each electrode is 35-40cm and is 10cm higher than that of polluted soil, the electrodes are arranged in a regular polygon mode, the PRB device comprises PRB active reaction materials (3) arranged around the electrodes, the PRB active reaction materials (3) and the composite electrodes formed by the electrodes are enclosed and fixed through wire netting (4), the polluted soil (5) to be repaired is filled between the wire netting (4), the electrodes are respectively arranged at two sides of the polluted soil (5) to be repaired, an impermeable layer is arranged below the polluted soil (5) to be repaired, and comprises a plastic film (9), 5-7cm thick zeolite (6), 5-7cm thick iron filings (7) and 2-5cm thick active carbon (8) which are sequentially paved; the electrode comprises a cathode (1) and an anode (2), the voltage regulating device is a direct current transformer (10), the cathode (1) is arranged in a regular hexagon mode, the anode (2) is arranged at the center of the regular hexagon, and the interval between the cathode (1) and/or the anode (2) is 30cm; the electrode comprises a cathode (1) and an anode (2), the voltage regulating device is a direct current transformer (10), the anode (2) is arranged in a regular hexagon manner, the cathode (1) is arranged at the center of the regular hexagon, and the interval between the cathode (1) and/or the anode (2) is 30cm; the electrodynamic device adopts solar power supply as a main power supply and a generator or mains supply as an auxiliary power supply, and outputs direct-current voltage with the interval of 0-220V through a direct-current transformer; the electrodynamic device adopts mains supply to supply power, and outputs direct-current voltage with the interval of 0-220V through a direct-current transformer; the electrode is a graphite rod electrode with the diameter of 2-4cm and the voltage gradient of 1-2V/cm; the compound contaminated soil is heavy metal and organic chlorine contaminated soil, and the PRB active reaction material (3) is zeolite, cast iron filings, attapulgite and active carbon; placing a plurality of PRB active materials around the cathode and anode graphite electrodes, and combining the PRB active materials with the graphite electrodes to form a permeable reactive composite electrode;
the electrodynamic-osmotic reaction grid apparatus comprises the steps of:
step one: providing a PRB active reactive material (3), and filling the PRB active reactive material (3) in a nylon mesh;
step two: digging a foundation pit with proper size in a field site, and sequentially paving a plastic film (9), zeolite with the thickness of 5-7cm (6), cast iron filings with the thickness of 5-7cm (7) and activated carbon with the thickness of 2-5cm (8);
step three: arranging electrodes, wrapping wire netting around the electrodes, wherein the diameter of each wire netting is 14cm, and placing nylon net filled with PRB active reaction materials (3) in a gap between the electrodes and the wire netting;
step four: burying the polluted soil to be treated between the wire meshes, spraying and irrigating the leacheate into the polluted soil, and switching on a power supply to repair the soil; the leacheate is 0.1M citric acid-sodium citrate and 0.5g/L biodegradable anionic surfactant rhamnolipid, and the water content is kept about 30%;
step five: after the repair is completed, excavating the repaired soil to other positions, and continuing to repair the soil next time;
the total removal rate of Cd in the soil after the repair is completed is 32.5%; the total removal rate of Cr was 31.5%;
the total removal rate of sixty-six was 48%; the total removal rate of the nasal discharge was 48%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310820100.8A CN116765112A (en) | 2016-07-11 | 2016-07-11 | Electrodynamic-osmotic reaction grid device |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610539787.8A CN106623397A (en) | 2016-07-11 | 2016-07-11 | Electrodynamics-permeation reaction grid device suitable for outdoor field repair of composite polluted soil and technological process |
| CN202310820100.8A CN116765112A (en) | 2016-07-11 | 2016-07-11 | Electrodynamic-osmotic reaction grid device |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610539787.8A Division CN106623397A (en) | 2016-07-11 | 2016-07-11 | Electrodynamics-permeation reaction grid device suitable for outdoor field repair of composite polluted soil and technological process |
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| CN202310820100.8A Pending CN116765112A (en) | 2016-07-11 | 2016-07-11 | Electrodynamic-osmotic reaction grid device |
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| CN109108066B (en) * | 2018-10-19 | 2023-12-08 | 中冶京诚工程技术有限公司 | Electric-chemical combined restoration system and method for organic matter polluted soil |
| CN109821885A (en) * | 2019-03-06 | 2019-05-31 | 中新曜昂环境修复(江苏)有限公司 | The EK-PRB device of packaged type reparation combined contamination soil |
| CN109821884A (en) * | 2019-03-06 | 2019-05-31 | 中新曜昂环境修复(江苏)有限公司 | Convenient for the field erected EK-PRB device for repairing combined contamination soil |
| CN114367533A (en) * | 2022-01-18 | 2022-04-19 | 陕西省土地工程建设集团有限责任公司 | Soil remediation system and method |
| CN115318821B (en) * | 2022-08-10 | 2023-08-18 | 东南大学 | Microbial electrochemical device and method for removing composite heavy metals in soil |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100537064C (en) * | 2005-12-23 | 2009-09-09 | 清华大学 | Method for electrically and biologically rehabilitating soil adopting electrode matrix |
| CN1899717B (en) * | 2006-07-07 | 2010-08-11 | 南开大学 | Process for united repairing heavy metal polluted soil by electric power and iron permeable reaction lattices |
| CN102527707B (en) * | 2012-02-24 | 2013-10-09 | 上海市环境科学研究院 | Enhanced electrokinetic remediation method of heavy metal contaminated soil |
| CN103252344B (en) * | 2013-05-20 | 2014-06-18 | 华北电力大学 | Electrically-enhanced soil in-situ eluting and repairing device and method |
| CN105149336B (en) * | 2015-09-29 | 2017-12-26 | 沈阳化工研究院有限公司 | A kind of soil remediation method and soil remediation equipment |
| CN205851554U (en) * | 2016-07-11 | 2017-01-04 | 国家地质实验测试中心 | A kind of electrodynamics hydrodynamic seepage pressure (EK PRB) device being applicable to the reparation of field condition combined contamination soil |
-
2016
- 2016-07-11 CN CN201610539787.8A patent/CN106623397A/en active Pending
- 2016-07-11 CN CN202310820100.8A patent/CN116765112A/en active Pending
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| CN106623397A (en) | 2017-05-10 |
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